commit 3734365463453ac101902b75d8186afd558b11a7 Author: Michaël Date: Thu Feb 26 18:33:00 2026 -0300 first commit Made-with: Cursor diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..73c0f2c --- /dev/null +++ b/.gitignore @@ -0,0 +1,40 @@ +# Dependencies +node_modules/ + +# Build / output +dist/ +build/ +*.tsbuildinfo + +# Environment and secrets +.env +.env.local +.env.*.local + +# Logs +logs/ +*.log +npm-debug.log* + +# OS +.DS_Store +Thumbs.db + +# IDE / editor +.idea/ +.vscode/ +*.swp +*.swo + +# SQLite / local DB +*.db +*.sqlite +*.sqlite3 +backend/data/ + +# Vite +frontend/dist/ + +# Misc +*.local +.cache/ diff --git a/backend/.env.example b/backend/.env.example new file mode 100644 index 0000000..b150fe9 --- /dev/null +++ b/backend/.env.example @@ -0,0 +1,62 @@ +# Server +PORT=3001 +TRUST_PROXY=false +# Comma-separated origins for CORS (default allows 5173 and 5174) +# ALLOWED_ORIGINS=http://localhost:5173,http://localhost:5174 + +# Database: omit for SQLite (default); set for Postgres +# DATABASE_URL=postgresql://user:pass@localhost:5432/faucet +# SQLITE_PATH=./data/faucet.db + +# Security (required) +HMAC_IP_SECRET=your-secret-key-min-32-chars +JWT_SECRET=your-jwt-secret-min-32-chars +JWT_EXPIRES_IN_SECONDS=604800 +NIP98_MAX_SKEW_SECONDS=300 +NONCE_TTL_SECONDS=600 + +# Faucet economics +FAUCET_ENABLED=true +EMERGENCY_STOP=false +FAUCET_MIN_SATS=10 +FAUCET_MAX_SATS=100 +PAYOUT_WEIGHT_SMALL=50 +PAYOUT_WEIGHT_MEDIUM=30 +PAYOUT_WEIGHT_LARGE=15 +PAYOUT_WEIGHT_JACKPOT=5 +PAYOUT_SMALL_SATS=10 +PAYOUT_MEDIUM_SATS=25 +PAYOUT_LARGE_SATS=50 +PAYOUT_JACKPOT_SATS=100 +DAILY_BUDGET_SATS=10000 +MAX_CLAIMS_PER_DAY=100 +MIN_WALLET_BALANCE_SATS=1000 + +# Eligibility +MIN_ACCOUNT_AGE_DAYS=14 +MIN_ACTIVITY_SCORE=30 +MIN_NOTES_COUNT=5 +MIN_FOLLOWING_COUNT=10 +MIN_FOLLOWERS_COUNT=0 +ACTIVITY_LOOKBACK_DAYS=90 + +# Cooldowns +COOLDOWN_DAYS=7 +IP_COOLDOWN_DAYS=7 +MAX_CLAIMS_PER_IP_PER_PERIOD=1 + +# Nostr +NOSTR_RELAYS=wss://relay.damus.io,wss://relay.nostr.band +RELAY_TIMEOUT_MS=5000 +MAX_EVENTS_FETCH=500 +METADATA_CACHE_HOURS=24 + +# LNbits +LNBITS_BASE_URL=https://azzamo.online +LNBITS_ADMIN_KEY=your-admin-key +LNBITS_WALLET_ID=your-wallet-id +DEPOSIT_LIGHTNING_ADDRESS=faucet@yourdomain.com +DEPOSIT_LNURLP=https://yourdomain.com/.well-known/lnurlp/faucet + +# Cashu redeem (optional; default: https://cashu-redeem.azzamo.net) +# CASHU_REDEEM_API_URL=https://cashu-redeem.azzamo.net diff --git a/backend/package-lock.json b/backend/package-lock.json new file mode 100644 index 0000000..b72e3b8 --- /dev/null +++ b/backend/package-lock.json @@ -0,0 +1,2303 @@ +{ + "name": "lnfaucet-backend", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "lnfaucet-backend", + "version": "1.0.0", + "dependencies": { + "better-sqlite3": "^11.6.0", + "cors": "^2.8.5", + "dotenv": "^16.4.5", + "express": "^4.21.1", + "express-rate-limit": "^7.4.1", + 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"pg": "^8.13.1", + "uuid": "^10.0.0" + }, + "devDependencies": { + "@types/better-sqlite3": "^7.6.11", + "@types/cors": "^2.8.17", + "@types/express": "^4.17.21", + "@types/node": "^22.9.0", + "@types/pg": "^8.11.10", + "@types/uuid": "^10.0.0", + "tsx": "^4.19.2", + "typescript": "^5.6.3" + } +} diff --git a/backend/src/auth/jwt.ts b/backend/src/auth/jwt.ts new file mode 100644 index 0000000..4fd8604 --- /dev/null +++ b/backend/src/auth/jwt.ts @@ -0,0 +1,32 @@ +import { createHmac } from "crypto"; +import { config } from "../config.js"; + +const HEADER = Buffer.from(JSON.stringify({ alg: "HS256", typ: "JWT" })).toString("base64url"); +const SEP = "."; + +export function signJwt(pubkey: string): string { + const exp = Math.floor(Date.now() / 1000) + config.jwtExpiresInSeconds; + const payload = Buffer.from(JSON.stringify({ pubkey, exp })).toString("base64url"); + const message = `${HEADER}${SEP}${payload}`; + const sig = createHmac("sha256", config.jwtSecret).update(message).digest("base64url"); + return `${message}${SEP}${sig}`; +} + +export function verifyJwt(token: string): { pubkey: string } | null { + try { + const parts = token.split(SEP); + if (parts.length !== 3) return null; + const [headerB64, payloadB64, sigB64] = parts; + const message = `${headerB64}${SEP}${payloadB64}`; + const expected = createHmac("sha256", config.jwtSecret).update(message).digest("base64url"); + if (sigB64 !== expected) return null; + const payload = JSON.parse( + Buffer.from(payloadB64, "base64url").toString("utf-8") + ) as { pubkey?: string; exp?: number }; + if (!payload.pubkey || typeof payload.pubkey !== "string") return null; + if (!payload.exp || payload.exp < Math.floor(Date.now() / 1000)) return null; + return { pubkey: payload.pubkey }; + } catch { + return null; + } +} diff --git a/backend/src/config.ts b/backend/src/config.ts new file mode 100644 index 0000000..8b3873f --- /dev/null +++ b/backend/src/config.ts @@ -0,0 +1,87 @@ +import "dotenv/config"; + +function env(key: string, defaultValue?: string): string { + const v = process.env[key]; + if (v !== undefined) return v; + if (defaultValue !== undefined) return defaultValue; + throw new Error(`Missing required env: ${key}`); +} + +function envInt(key: string, defaultValue: number): number { + const v = process.env[key]; + if (v === undefined) return defaultValue; + const n = parseInt(v, 10); + if (Number.isNaN(n)) throw new Error(`Invalid integer env: ${key}`); + return n; +} + +function envBool(key: string, defaultValue: boolean): boolean { + const v = process.env[key]; + if (v === undefined) return defaultValue; + return v === "true" || v === "1"; +} + +export const config = { + port: envInt("PORT", 3001), + trustProxy: envBool("TRUST_PROXY", false), + allowedOrigins: (process.env.ALLOWED_ORIGINS ?? process.env.FRONTEND_URL ?? "http://localhost:5173,http://localhost:5174").split(",").map((s) => s.trim()), + + // Database: omit DATABASE_URL for SQLite; set for Postgres + databaseUrl: process.env.DATABASE_URL as string | undefined, + sqlitePath: process.env.SQLITE_PATH ?? "./data/faucet.db", + + // Security + hmacIpSecret: env("HMAC_IP_SECRET"), + jwtSecret: env("JWT_SECRET", process.env.HMAC_IP_SECRET ?? ""), + jwtExpiresInSeconds: envInt("JWT_EXPIRES_IN_SECONDS", 86400 * 7), // 7 days + nip98MaxSkewSeconds: envInt("NIP98_MAX_SKEW_SECONDS", 300), + nonceTtlSeconds: envInt("NONCE_TTL_SECONDS", 600), + + // Faucet economics + faucetEnabled: envBool("FAUCET_ENABLED", true), + emergencyStop: envBool("EMERGENCY_STOP", false), + faucetMinSats: envInt("FAUCET_MIN_SATS", 1), + faucetMaxSats: envInt("FAUCET_MAX_SATS", 5), + payoutWeightSmall: envInt("PAYOUT_WEIGHT_SMALL", 50), + payoutWeightMedium: envInt("PAYOUT_WEIGHT_MEDIUM", 30), + payoutWeightLarge: envInt("PAYOUT_WEIGHT_LARGE", 15), + payoutWeightJackpot: envInt("PAYOUT_WEIGHT_JACKPOT", 5), + payoutSmallSats: envInt("PAYOUT_SMALL_SATS", 10), + payoutMediumSats: envInt("PAYOUT_MEDIUM_SATS", 25), + payoutLargeSats: envInt("PAYOUT_LARGE_SATS", 50), + payoutJackpotSats: envInt("PAYOUT_JACKPOT_SATS", 100), + dailyBudgetSats: envInt("DAILY_BUDGET_SATS", 10000), + maxClaimsPerDay: envInt("MAX_CLAIMS_PER_DAY", 100), + minWalletBalanceSats: envInt("MIN_WALLET_BALANCE_SATS", 1000), + + // Eligibility + minAccountAgeDays: envInt("MIN_ACCOUNT_AGE_DAYS", 14), + minActivityScore: envInt("MIN_ACTIVITY_SCORE", 30), + minNotesCount: envInt("MIN_NOTES_COUNT", 5), + minFollowingCount: envInt("MIN_FOLLOWING_COUNT", 10), + minFollowersCount: envInt("MIN_FOLLOWERS_COUNT", 0), + activityLookbackDays: envInt("ACTIVITY_LOOKBACK_DAYS", 90), + + // Cooldowns + cooldownDays: envInt("COOLDOWN_DAYS", 7), + ipCooldownDays: envInt("IP_COOLDOWN_DAYS", 7), + maxClaimsPerIpPerPeriod: envInt("MAX_CLAIMS_PER_IP_PER_PERIOD", 1), + + // Nostr (defaults include relays common for remote signers / NIP-05) + nostrRelays: (process.env.NOSTR_RELAYS ?? "wss://relay.damus.io,wss://relay.nostr.band,wss://relay.getalby.com,wss://nos.lol").split(",").map((s) => s.trim()), + relayTimeoutMs: envInt("RELAY_TIMEOUT_MS", 5000), + maxEventsFetch: envInt("MAX_EVENTS_FETCH", 500), + metadataCacheHours: envInt("METADATA_CACHE_HOURS", 24), + + // LNbits + lnbitsBaseUrl: env("LNBITS_BASE_URL").replace(/\/$/, ""), + lnbitsAdminKey: env("LNBITS_ADMIN_KEY"), + lnbitsWalletId: env("LNBITS_WALLET_ID"), + depositLightningAddress: process.env.DEPOSIT_LIGHTNING_ADDRESS ?? "", + depositLnurlp: process.env.DEPOSIT_LNURLP ?? "", + cashuRedeemApiUrl: (process.env.CASHU_REDEEM_API_URL ?? "https://cashu-redeem.azzamo.net").replace(/\/$/, ""), +}; + +export function usePostgres(): boolean { + return Boolean(config.databaseUrl); +} diff --git a/backend/src/db/index.ts b/backend/src/db/index.ts new file mode 100644 index 0000000..72e7a8c --- /dev/null +++ b/backend/src/db/index.ts @@ -0,0 +1,24 @@ +import { config, usePostgres } from "../config.js"; +import { createPgDb } from "./pg.js"; +import { createSqliteDb } from "./sqlite.js"; +import type { Db } from "./types.js"; +import { mkdirSync, existsSync } from "fs"; +import { dirname } from "path"; + +let dbInstance: Db | null = null; + +export function getDb(): Db { + if (!dbInstance) { + if (usePostgres() && config.databaseUrl) { + dbInstance = createPgDb(config.databaseUrl); + } else { + const dir = dirname(config.sqlitePath); + if (!existsSync(dir)) mkdirSync(dir, { recursive: true }); + dbInstance = createSqliteDb(config.sqlitePath); + } + } + return dbInstance; +} + +export type { Db } from "./types.js"; +export type { UserRow, ClaimRow, QuoteRow, IpLimitRow } from "./types.js"; diff --git a/backend/src/db/migrate.ts b/backend/src/db/migrate.ts new file mode 100644 index 0000000..9643902 --- /dev/null +++ b/backend/src/db/migrate.ts @@ -0,0 +1,14 @@ +import "dotenv/config"; +import { getDb } from "./index.js"; + +async function main() { + const db = getDb(); + await db.runMigrations(); + console.log("Migrations complete."); + process.exit(0); +} + +main().catch((err) => { + console.error(err); + process.exit(1); +}); diff --git a/backend/src/db/pg.ts b/backend/src/db/pg.ts new file mode 100644 index 0000000..5471099 --- /dev/null +++ b/backend/src/db/pg.ts @@ -0,0 +1,347 @@ +import pg from "pg"; +import { readFileSync } from "fs"; +import { dirname, join } from "path"; +import { fileURLToPath } from "url"; +import type { ClaimRow, Db, DepositSource, IpLimitRow, QuoteRow, UserRow } from "./types.js"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); + +export function createPgDb(connectionString: string): Db { + const pool = new pg.Pool({ connectionString }); + + function toUserRow(r: pg.QueryResultRow): UserRow { + return { + pubkey: r.pubkey, + nostr_first_seen_at: r.nostr_first_seen_at != null ? Number(r.nostr_first_seen_at) : null, + notes_count: Number(r.notes_count), + followers_count: Number(r.followers_count), + following_count: Number(r.following_count), + activity_score: Number(r.activity_score), + last_metadata_fetch_at: r.last_metadata_fetch_at != null ? Number(r.last_metadata_fetch_at) : null, + lightning_address: r.lightning_address ?? null, + name: r.name ?? null, + created_at: Number(r.created_at), + updated_at: Number(r.updated_at), + }; + } + + function toClaimRow(r: pg.QueryResultRow): ClaimRow { + return { + id: r.id, + pubkey: r.pubkey, + claimed_at: Number(r.claimed_at), + payout_sats: r.payout_sats, + ip_hash: r.ip_hash, + payout_destination_hash: r.payout_destination_hash, + status: r.status, + lnbits_payment_hash: r.lnbits_payment_hash, + error_message: r.error_message, + }; + } + + function toQuoteRow(r: pg.QueryResultRow): QuoteRow { + return { + quote_id: r.quote_id, + pubkey: r.pubkey, + payout_sats: r.payout_sats, + lightning_address: r.lightning_address ?? null, + created_at: Number(r.created_at), + expires_at: Number(r.expires_at), + status: r.status, + }; + } + + return { + async runMigrations() { + const schema = readFileSync(join(__dirname, "schema.pg.sql"), "utf-8"); + await pool.query(schema); + try { + await pool.query("ALTER TABLE users ADD COLUMN lightning_address TEXT"); + } catch (_) {} + try { + await pool.query("ALTER TABLE users ADD COLUMN name TEXT"); + } catch (_) {} + try { + await pool.query( + `CREATE TABLE IF NOT EXISTS deposits ( + id SERIAL PRIMARY KEY, + created_at BIGINT NOT NULL, + amount_sats INTEGER NOT NULL, + source TEXT NOT NULL CHECK(source IN ('lightning','cashu')), + lnbits_payment_hash TEXT + )` + ); + await pool.query("CREATE INDEX IF NOT EXISTS idx_deposits_created_at ON deposits(created_at)"); + } catch (_) {} + try { + await pool.query("ALTER TABLE deposits ADD COLUMN lnbits_payment_hash TEXT"); + } catch (_) {} + try { + await pool.query("CREATE INDEX IF NOT EXISTS idx_deposits_lnbits_payment_hash ON deposits(lnbits_payment_hash)"); + } catch (_) {} + try { + await pool.query( + "UPDATE deposits SET amount_sats = amount_sats / 1000 WHERE source = 'lightning' AND lnbits_payment_hash IS NOT NULL AND amount_sats >= 1000" + ); + } catch (_) {} + }, + + async getUser(pubkey: string): Promise { + const res = await pool.query("SELECT * FROM users WHERE pubkey = $1", [pubkey]); + return res.rows.length ? toUserRow(res.rows[0]) : null; + }, + + async upsertUser(row: Omit): Promise { + const now = Math.floor(Date.now() / 1000); + await pool.query( + `INSERT INTO users (pubkey, nostr_first_seen_at, notes_count, followers_count, following_count, activity_score, last_metadata_fetch_at, lightning_address, name, created_at, updated_at) + VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $10) + ON CONFLICT(pubkey) DO UPDATE SET + nostr_first_seen_at = EXCLUDED.nostr_first_seen_at, + notes_count = EXCLUDED.notes_count, + followers_count = EXCLUDED.followers_count, + following_count = EXCLUDED.following_count, + activity_score = EXCLUDED.activity_score, + last_metadata_fetch_at = EXCLUDED.last_metadata_fetch_at, + lightning_address = EXCLUDED.lightning_address, + name = EXCLUDED.name, + updated_at = EXCLUDED.updated_at`, + [ + row.pubkey, + row.nostr_first_seen_at ?? null, + row.notes_count ?? 0, + row.followers_count ?? 0, + row.following_count ?? 0, + row.activity_score ?? 0, + row.last_metadata_fetch_at ?? null, + row.lightning_address ?? null, + row.name ?? null, + now, + ] + ); + }, + + async updateUserNostrCache( + pubkey: string, + data: { + nostr_first_seen_at: number | null; + notes_count: number; + followers_count: number; + following_count: number; + activity_score: number; + last_metadata_fetch_at: number; + } + ): Promise { + const now = Math.floor(Date.now() / 1000); + await pool.query( + `UPDATE users SET + nostr_first_seen_at = $1, notes_count = $2, followers_count = $3, following_count = $4, + activity_score = $5, last_metadata_fetch_at = $6, updated_at = $7 + WHERE pubkey = $8`, + [ + data.nostr_first_seen_at, + data.notes_count, + data.followers_count, + data.following_count, + data.activity_score, + data.last_metadata_fetch_at, + now, + pubkey, + ] + ); + }, + + async getLastSuccessfulClaimByPubkey(pubkey: string): Promise { + const res = await pool.query( + "SELECT * FROM claims WHERE pubkey = $1 AND status = 'paid' ORDER BY claimed_at DESC LIMIT 1", + [pubkey] + ); + return res.rows.length ? toClaimRow(res.rows[0]) : null; + }, + + async getLastClaimByIpHash(ipHash: string): Promise { + const res = await pool.query( + "SELECT * FROM claims WHERE ip_hash = $1 AND status = 'paid' ORDER BY claimed_at DESC LIMIT 1", + [ipHash] + ); + return res.rows.length ? toClaimRow(res.rows[0]) : null; + }, + + async getClaimCountForIpSince(ipHash: string, sinceTs: number): Promise { + const res = await pool.query( + "SELECT COUNT(*) as c FROM claims WHERE ip_hash = $1 AND status = 'paid' AND claimed_at >= $2", + [ipHash, sinceTs] + ); + return parseInt(res.rows[0]?.c ?? "0", 10); + }, + + async createClaim(row: Omit): Promise { + const res = await pool.query( + `INSERT INTO claims (pubkey, claimed_at, payout_sats, ip_hash, payout_destination_hash, status, lnbits_payment_hash, error_message) + VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING id`, + [ + row.pubkey, + row.claimed_at, + row.payout_sats, + row.ip_hash, + row.payout_destination_hash ?? null, + row.status, + row.lnbits_payment_hash ?? null, + row.error_message ?? null, + ] + ); + return res.rows[0].id; + }, + + async updateClaimStatus( + id: number, + status: ClaimRow["status"], + lnbitsPaymentHash?: string, + errorMessage?: string + ): Promise { + await pool.query( + "UPDATE claims SET status = $1, lnbits_payment_hash = $2, error_message = $3 WHERE id = $4", + [status, lnbitsPaymentHash ?? null, errorMessage ?? null, id] + ); + }, + + async getIpLimit(ipHash: string): Promise { + const res = await pool.query("SELECT * FROM ip_limits WHERE ip_hash = $1", [ipHash]); + if (!res.rows.length) return null; + const r = res.rows[0]; + return { + ip_hash: r.ip_hash, + last_claimed_at: Number(r.last_claimed_at), + claim_count_period: Number(r.claim_count_period), + }; + }, + + async upsertIpLimit(ipHash: string, lastClaimedAt: number, claimCountPeriod: number): Promise { + await pool.query( + `INSERT INTO ip_limits (ip_hash, last_claimed_at, claim_count_period) VALUES ($1, $2, $3) + ON CONFLICT(ip_hash) DO UPDATE SET last_claimed_at = $2, claim_count_period = $3`, + [ipHash, lastClaimedAt, claimCountPeriod] + ); + }, + + async createQuote(quoteId: string, pubkey: string, payoutSats: number, lightningAddress: string, expiresAt: number): Promise { + const now = Math.floor(Date.now() / 1000); + await pool.query( + "INSERT INTO quotes (quote_id, pubkey, payout_sats, lightning_address, created_at, expires_at, status) VALUES ($1, $2, $3, $4, $5, $6, 'active')", + [quoteId, pubkey, payoutSats, lightningAddress, now, expiresAt] + ); + }, + + async getQuote(quoteId: string): Promise { + const res = await pool.query("SELECT * FROM quotes WHERE quote_id = $1", [quoteId]); + return res.rows.length ? toQuoteRow(res.rows[0]) : null; + }, + + async consumeQuote(quoteId: string): Promise { + await pool.query("UPDATE quotes SET status = 'consumed' WHERE quote_id = $1", [quoteId]); + }, + + async setNonce(nonce: string, expiresAt: number): Promise { + await pool.query( + "INSERT INTO nonces (nonce, expires_at) VALUES ($1, $2) ON CONFLICT (nonce) DO UPDATE SET expires_at = $2", + [nonce, expiresAt] + ); + }, + + async hasNonce(nonce: string): Promise { + const now = Math.floor(Date.now() / 1000); + const res = await pool.query("SELECT 1 FROM nonces WHERE nonce = $1 AND expires_at > $2", [nonce, now]); + return res.rows.length > 0; + }, + + async deleteExpiredNonces(): Promise { + const now = Math.floor(Date.now() / 1000); + await pool.query("DELETE FROM nonces WHERE expires_at <= $1", [now]); + }, + + async getTotalPaidSats(): Promise { + const res = await pool.query( + "SELECT COALESCE(SUM(payout_sats), 0)::bigint as total FROM claims WHERE status = 'paid'" + ); + return parseInt(res.rows[0]?.total ?? "0", 10); + }, + + async getTotalClaimsCount(): Promise { + const res = await pool.query("SELECT COUNT(*) as c FROM claims WHERE status = 'paid'"); + return parseInt(res.rows[0]?.c ?? "0", 10); + }, + + async getClaimsCountSince(sinceTs: number): Promise { + const res = await pool.query( + "SELECT COUNT(*) as c FROM claims WHERE status = 'paid' AND claimed_at >= $1", + [sinceTs] + ); + return parseInt(res.rows[0]?.c ?? "0", 10); + }, + + async getPaidSatsSince(sinceTs: number): Promise { + const res = await pool.query( + "SELECT COALESCE(SUM(payout_sats), 0)::bigint as total FROM claims WHERE status = 'paid' AND claimed_at >= $1", + [sinceTs] + ); + return parseInt(res.rows[0]?.total ?? "0", 10); + }, + + async getRecentPayouts( + limit: number + ): Promise<{ pubkey_prefix: string; payout_sats: number; claimed_at: number }[]> { + const res = await pool.query( + "SELECT pubkey, payout_sats, claimed_at FROM claims WHERE status = 'paid' ORDER BY claimed_at DESC LIMIT $1", + [limit] + ); + return res.rows.map((r) => ({ + pubkey_prefix: r.pubkey.slice(0, 8) + "…", + payout_sats: r.payout_sats, + claimed_at: Number(r.claimed_at), + })); + }, + + async insertDeposit( + amountSats: number, + source: DepositSource, + lnbitsPaymentHash?: string | null, + createdAt?: number + ): Promise { + const now = createdAt ?? Math.floor(Date.now() / 1000); + await pool.query( + "INSERT INTO deposits (created_at, amount_sats, source, lnbits_payment_hash) VALUES ($1, $2, $3, $4)", + [now, amountSats, source, lnbitsPaymentHash ?? null] + ); + }, + + async hasDepositWithPaymentHash(paymentHash: string): Promise { + const res = await pool.query( + "SELECT 1 FROM deposits WHERE lnbits_payment_hash = $1 LIMIT 1", + [paymentHash] + ); + return res.rows.length > 0; + }, + + async updateDepositCreatedAtIfMissing(paymentHash: string, createdAt: number): Promise { + const res = await pool.query( + "UPDATE deposits SET created_at = $1 WHERE lnbits_payment_hash = $2 AND (created_at IS NULL OR created_at < 1000000000) RETURNING id", + [createdAt, paymentHash] + ); + return res.rowCount !== null && res.rowCount > 0; + }, + + async getRecentDeposits( + limit: number + ): Promise<{ amount_sats: number; source: DepositSource; created_at: number }[]> { + const res = await pool.query( + "SELECT amount_sats, source, created_at FROM deposits ORDER BY created_at DESC LIMIT $1", + [limit] + ); + return res.rows.map((r) => ({ + amount_sats: Number(r.amount_sats), + source: r.source as DepositSource, + created_at: Number(r.created_at), + })); + }, + }; +} diff --git a/backend/src/db/schema-sqlite.sql b/backend/src/db/schema-sqlite.sql new file mode 100644 index 0000000..4181a99 --- /dev/null +++ b/backend/src/db/schema-sqlite.sql @@ -0,0 +1,50 @@ +-- SQLite schema for LNFaucet +CREATE TABLE IF NOT EXISTS users ( + pubkey TEXT PRIMARY KEY, + nostr_first_seen_at INTEGER, + notes_count INTEGER NOT NULL DEFAULT 0, + followers_count INTEGER NOT NULL DEFAULT 0, + following_count INTEGER NOT NULL DEFAULT 0, + activity_score INTEGER NOT NULL DEFAULT 0, + last_metadata_fetch_at INTEGER, + created_at INTEGER NOT NULL, + updated_at INTEGER NOT NULL +); + +CREATE TABLE IF NOT EXISTS claims ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + pubkey TEXT NOT NULL, + claimed_at INTEGER NOT NULL, + payout_sats INTEGER NOT NULL, + ip_hash TEXT NOT NULL, + payout_destination_hash TEXT, + status TEXT NOT NULL, + lnbits_payment_hash TEXT, + error_message TEXT, + quote_id TEXT +); + +CREATE TABLE IF NOT EXISTS ip_limits ( + ip_hash TEXT PRIMARY KEY, + last_claimed_at INTEGER, + claim_count_period INTEGER NOT NULL DEFAULT 0 +); + +CREATE TABLE IF NOT EXISTS quotes ( + quote_id TEXT PRIMARY KEY, + pubkey TEXT NOT NULL, + payout_sats INTEGER NOT NULL, + created_at INTEGER NOT NULL, + expires_at INTEGER NOT NULL, + status TEXT NOT NULL +); + +CREATE TABLE IF NOT EXISTS nonces ( + nonce TEXT PRIMARY KEY, + expires_at INTEGER NOT NULL +); + +CREATE INDEX IF NOT EXISTS idx_claims_pubkey ON claims(pubkey); +CREATE INDEX IF NOT EXISTS idx_claims_claimed_at ON claims(claimed_at); +CREATE INDEX IF NOT EXISTS idx_quotes_expires_at ON quotes(expires_at); +CREATE INDEX IF NOT EXISTS idx_quotes_status ON quotes(status); diff --git a/backend/src/db/schema.pg.sql b/backend/src/db/schema.pg.sql new file mode 100644 index 0000000..fc9e35a --- /dev/null +++ b/backend/src/db/schema.pg.sql @@ -0,0 +1,69 @@ +-- Postgres schema +CREATE TABLE IF NOT EXISTS users ( + pubkey TEXT PRIMARY KEY, + nostr_first_seen_at BIGINT, + notes_count INTEGER DEFAULT 0, + followers_count INTEGER DEFAULT 0, + following_count INTEGER DEFAULT 0, + activity_score INTEGER DEFAULT 0, + last_metadata_fetch_at BIGINT, + lightning_address TEXT, + name TEXT, + created_at BIGINT NOT NULL DEFAULT (EXTRACT(EPOCH FROM NOW())::BIGINT), + updated_at BIGINT NOT NULL DEFAULT (EXTRACT(EPOCH FROM NOW())::BIGINT) +); + +CREATE TABLE IF NOT EXISTS claims ( + id SERIAL PRIMARY KEY, + pubkey TEXT NOT NULL REFERENCES users(pubkey), + claimed_at BIGINT NOT NULL, + payout_sats INTEGER NOT NULL, + ip_hash TEXT NOT NULL, + payout_destination_hash TEXT, + status TEXT NOT NULL CHECK(status IN ('pending','paid','failed')), + lnbits_payment_hash TEXT, + error_message TEXT +); + +CREATE TABLE IF NOT EXISTS ip_limits ( + ip_hash TEXT PRIMARY KEY, + last_claimed_at BIGINT NOT NULL, + claim_count_period INTEGER NOT NULL DEFAULT 0 +); + +CREATE TABLE IF NOT EXISTS quotes ( + quote_id TEXT PRIMARY KEY, + pubkey TEXT NOT NULL, + payout_sats INTEGER NOT NULL, + lightning_address TEXT, + created_at BIGINT NOT NULL, + expires_at BIGINT NOT NULL, + status TEXT NOT NULL CHECK(status IN ('active','consumed','expired')) +); + +CREATE TABLE IF NOT EXISTS daily_stats ( + date TEXT PRIMARY KEY, + total_paid_sats INTEGER NOT NULL DEFAULT 0, + total_claims INTEGER NOT NULL DEFAULT 0, + unique_pubkeys INTEGER NOT NULL DEFAULT 0 +); + +CREATE TABLE IF NOT EXISTS nonces ( + nonce TEXT PRIMARY KEY, + expires_at BIGINT NOT NULL +); + +CREATE TABLE IF NOT EXISTS deposits ( + id SERIAL PRIMARY KEY, + created_at BIGINT NOT NULL, + amount_sats INTEGER NOT NULL, + source TEXT NOT NULL CHECK(source IN ('lightning','cashu')), + lnbits_payment_hash TEXT +); + +CREATE INDEX IF NOT EXISTS idx_claims_pubkey ON claims(pubkey); +CREATE INDEX IF NOT EXISTS idx_claims_claimed_at ON claims(claimed_at); +CREATE INDEX IF NOT EXISTS idx_quotes_expires_at ON quotes(expires_at); +CREATE INDEX IF NOT EXISTS idx_quotes_status ON quotes(status); +CREATE INDEX IF NOT EXISTS idx_deposits_created_at ON deposits(created_at); +CREATE INDEX IF NOT EXISTS idx_deposits_lnbits_payment_hash ON deposits(lnbits_payment_hash); diff --git a/backend/src/db/schema.sql b/backend/src/db/schema.sql new file mode 100644 index 0000000..d244c3b --- /dev/null +++ b/backend/src/db/schema.sql @@ -0,0 +1,70 @@ +-- SQLite schema +CREATE TABLE IF NOT EXISTS users ( + pubkey TEXT PRIMARY KEY, + nostr_first_seen_at INTEGER, + notes_count INTEGER DEFAULT 0, + followers_count INTEGER DEFAULT 0, + following_count INTEGER DEFAULT 0, + activity_score INTEGER DEFAULT 0, + last_metadata_fetch_at INTEGER, + lightning_address TEXT, + name TEXT, + created_at INTEGER NOT NULL DEFAULT (unixepoch()), + updated_at INTEGER NOT NULL DEFAULT (unixepoch()) +); + +CREATE TABLE IF NOT EXISTS claims ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + pubkey TEXT NOT NULL, + claimed_at INTEGER NOT NULL, + payout_sats INTEGER NOT NULL, + ip_hash TEXT NOT NULL, + payout_destination_hash TEXT, + status TEXT NOT NULL CHECK(status IN ('pending','paid','failed')), + lnbits_payment_hash TEXT, + error_message TEXT, + FOREIGN KEY (pubkey) REFERENCES users(pubkey) +); + +CREATE TABLE IF NOT EXISTS ip_limits ( + ip_hash TEXT PRIMARY KEY, + last_claimed_at INTEGER NOT NULL, + claim_count_period INTEGER NOT NULL DEFAULT 0 +); + +CREATE TABLE IF NOT EXISTS quotes ( + quote_id TEXT PRIMARY KEY, + pubkey TEXT NOT NULL, + payout_sats INTEGER NOT NULL, + lightning_address TEXT, + created_at INTEGER NOT NULL, + expires_at INTEGER NOT NULL, + status TEXT NOT NULL CHECK(status IN ('active','consumed','expired')) +); + +CREATE TABLE IF NOT EXISTS daily_stats ( + date TEXT PRIMARY KEY, + total_paid_sats INTEGER NOT NULL DEFAULT 0, + total_claims INTEGER NOT NULL DEFAULT 0, + unique_pubkeys INTEGER NOT NULL DEFAULT 0 +); + +CREATE TABLE IF NOT EXISTS nonces ( + nonce TEXT PRIMARY KEY, + expires_at INTEGER NOT NULL +); + +CREATE TABLE IF NOT EXISTS deposits ( + id INTEGER PRIMARY KEY AUTOINCREMENT, + created_at INTEGER NOT NULL, + amount_sats INTEGER NOT NULL, + source TEXT NOT NULL CHECK(source IN ('lightning','cashu')), + lnbits_payment_hash TEXT +); + +CREATE INDEX IF NOT EXISTS idx_claims_pubkey ON claims(pubkey); +CREATE INDEX IF NOT EXISTS idx_claims_claimed_at ON claims(claimed_at); +CREATE INDEX IF NOT EXISTS idx_quotes_expires_at ON quotes(expires_at); +CREATE INDEX IF NOT EXISTS idx_quotes_status ON quotes(status); +CREATE INDEX IF NOT EXISTS idx_deposits_created_at ON deposits(created_at); +CREATE INDEX IF NOT EXISTS idx_deposits_lnbits_payment_hash ON deposits(lnbits_payment_hash); diff --git a/backend/src/db/sqlite.ts b/backend/src/db/sqlite.ts new file mode 100644 index 0000000..0155a69 --- /dev/null +++ b/backend/src/db/sqlite.ts @@ -0,0 +1,287 @@ +import Database from "better-sqlite3"; +import { readFileSync } from "fs"; +import { dirname, join } from "path"; +import { fileURLToPath } from "url"; +import type { ClaimRow, Db, DepositSource, IpLimitRow, QuoteRow, UserRow } from "./types.js"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); + +export function createSqliteDb(path: string): Db { + const db = new Database(path); + + return { + async runMigrations() { + const schema = readFileSync(join(__dirname, "schema.sql"), "utf-8"); + db.exec(schema); + try { + db.exec("ALTER TABLE users ADD COLUMN lightning_address TEXT"); + } catch (_) {} + try { + db.exec("ALTER TABLE users ADD COLUMN name TEXT"); + } catch (_) {} + try { + db.exec( + "CREATE TABLE IF NOT EXISTS deposits (id INTEGER PRIMARY KEY AUTOINCREMENT, created_at INTEGER NOT NULL, amount_sats INTEGER NOT NULL, source TEXT NOT NULL CHECK(source IN ('lightning','cashu')), lnbits_payment_hash TEXT)" + ); + db.exec("CREATE INDEX IF NOT EXISTS idx_deposits_created_at ON deposits(created_at)"); + } catch (_) {} + try { + db.exec("ALTER TABLE deposits ADD COLUMN lnbits_payment_hash TEXT"); + } catch (_) {} + try { + db.exec("CREATE INDEX IF NOT EXISTS idx_deposits_lnbits_payment_hash ON deposits(lnbits_payment_hash)"); + } catch (_) {} + try { + db.exec( + "UPDATE deposits SET amount_sats = amount_sats / 1000 WHERE source = 'lightning' AND lnbits_payment_hash IS NOT NULL AND amount_sats >= 1000" + ); + } catch (_) {} + }, + + async getUser(pubkey: string): Promise { + const row = db.prepare("SELECT * FROM users WHERE pubkey = ?").get(pubkey) as UserRow | undefined; + return row ?? null; + }, + + async upsertUser(row: Omit): Promise { + const now = Math.floor(Date.now() / 1000); + db.prepare( + `INSERT INTO users (pubkey, nostr_first_seen_at, notes_count, followers_count, following_count, activity_score, last_metadata_fetch_at, lightning_address, name, created_at, updated_at) + VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) + ON CONFLICT(pubkey) DO UPDATE SET + nostr_first_seen_at = excluded.nostr_first_seen_at, + notes_count = excluded.notes_count, + followers_count = excluded.followers_count, + following_count = excluded.following_count, + activity_score = excluded.activity_score, + last_metadata_fetch_at = excluded.last_metadata_fetch_at, + lightning_address = excluded.lightning_address, + name = excluded.name, + updated_at = excluded.updated_at` + ).run( + row.pubkey, + row.nostr_first_seen_at ?? null, + row.notes_count ?? 0, + row.followers_count ?? 0, + row.following_count ?? 0, + row.activity_score ?? 0, + row.last_metadata_fetch_at ?? null, + row.lightning_address ?? null, + row.name ?? null, + now, + now + ); + }, + + async updateUserNostrCache( + pubkey: string, + data: { + nostr_first_seen_at: number | null; + notes_count: number; + followers_count: number; + following_count: number; + activity_score: number; + last_metadata_fetch_at: number; + } + ): Promise { + const now = Math.floor(Date.now() / 1000); + db.prepare( + `UPDATE users SET + nostr_first_seen_at = ?, notes_count = ?, followers_count = ?, following_count = ?, + activity_score = ?, last_metadata_fetch_at = ?, updated_at = ? + WHERE pubkey = ?` + ).run( + data.nostr_first_seen_at, + data.notes_count, + data.followers_count, + data.following_count, + data.activity_score, + data.last_metadata_fetch_at, + now, + pubkey + ); + }, + + async getLastSuccessfulClaimByPubkey(pubkey: string): Promise { + const row = db + .prepare("SELECT * FROM claims WHERE pubkey = ? AND status = 'paid' ORDER BY claimed_at DESC LIMIT 1") + .get(pubkey) as ClaimRow | undefined; + return row ?? null; + }, + + async getLastClaimByIpHash(ipHash: string): Promise { + const row = db + .prepare("SELECT * FROM claims WHERE ip_hash = ? AND status = 'paid' ORDER BY claimed_at DESC LIMIT 1") + .get(ipHash) as ClaimRow | undefined; + return row ?? null; + }, + + async getClaimCountForIpSince(ipHash: string, sinceTs: number): Promise { + const row = db + .prepare( + "SELECT COUNT(*) as c FROM claims WHERE ip_hash = ? AND status = 'paid' AND claimed_at >= ?" + ) + .get(ipHash, sinceTs) as { c: number }; + return row?.c ?? 0; + }, + + async createClaim(row: Omit): Promise { + const result = db + .prepare( + `INSERT INTO claims (pubkey, claimed_at, payout_sats, ip_hash, payout_destination_hash, status, lnbits_payment_hash, error_message) + VALUES (?, ?, ?, ?, ?, ?, ?, ?)` + ) + .run( + row.pubkey, + row.claimed_at, + row.payout_sats, + row.ip_hash, + row.payout_destination_hash ?? null, + row.status, + row.lnbits_payment_hash ?? null, + row.error_message ?? null + ); + return result.lastInsertRowid as number; + }, + + async updateClaimStatus( + id: number, + status: ClaimRow["status"], + lnbitsPaymentHash?: string, + errorMessage?: string + ): Promise { + db.prepare( + "UPDATE claims SET status = ?, lnbits_payment_hash = ?, error_message = ? WHERE id = ?" + ).run(status, lnbitsPaymentHash ?? null, errorMessage ?? null, id); + }, + + async getIpLimit(ipHash: string): Promise { + const row = db.prepare("SELECT * FROM ip_limits WHERE ip_hash = ?").get(ipHash) as IpLimitRow | undefined; + return row ?? null; + }, + + async upsertIpLimit(ipHash: string, lastClaimedAt: number, claimCountPeriod: number): Promise { + db.prepare( + `INSERT INTO ip_limits (ip_hash, last_claimed_at, claim_count_period) VALUES (?, ?, ?) + ON CONFLICT(ip_hash) DO UPDATE SET last_claimed_at = ?, claim_count_period = ?` + ).run(ipHash, lastClaimedAt, claimCountPeriod, lastClaimedAt, claimCountPeriod); + }, + + async createQuote(quoteId: string, pubkey: string, payoutSats: number, lightningAddress: string, expiresAt: number): Promise { + const now = Math.floor(Date.now() / 1000); + db.prepare( + "INSERT INTO quotes (quote_id, pubkey, payout_sats, lightning_address, created_at, expires_at, status) VALUES (?, ?, ?, ?, ?, ?, 'active')" + ).run(quoteId, pubkey, payoutSats, lightningAddress, now, expiresAt); + }, + + async getQuote(quoteId: string): Promise { + const row = db.prepare("SELECT * FROM quotes WHERE quote_id = ?").get(quoteId) as QuoteRow | undefined; + return row ?? null; + }, + + async consumeQuote(quoteId: string): Promise { + db.prepare("UPDATE quotes SET status = 'consumed' WHERE quote_id = ?").run(quoteId); + }, + + async setNonce(nonce: string, expiresAt: number): Promise { + db.prepare("INSERT OR REPLACE INTO nonces (nonce, expires_at) VALUES (?, ?)").run(nonce, expiresAt); + }, + + async hasNonce(nonce: string): Promise { + const now = Math.floor(Date.now() / 1000); + const row = db.prepare("SELECT 1 FROM nonces WHERE nonce = ? AND expires_at > ?").get(nonce, now); + return !!row; + }, + + async deleteExpiredNonces(): Promise { + const now = Math.floor(Date.now() / 1000); + db.prepare("DELETE FROM nonces WHERE expires_at <= ?").run(now); + }, + + async getTotalPaidSats(): Promise { + const row = db + .prepare("SELECT COALESCE(SUM(payout_sats), 0) as total FROM claims WHERE status = 'paid'") + .get() as { total: number }; + return row?.total ?? 0; + }, + + async getTotalClaimsCount(): Promise { + const row = db + .prepare("SELECT COUNT(*) as c FROM claims WHERE status = 'paid'") + .get() as { c: number }; + return row?.c ?? 0; + }, + + async getClaimsCountSince(sinceTs: number): Promise { + const row = db + .prepare("SELECT COUNT(*) as c FROM claims WHERE status = 'paid' AND claimed_at >= ?") + .get(sinceTs) as { c: number }; + return row?.c ?? 0; + }, + + async getPaidSatsSince(sinceTs: number): Promise { + const row = db + .prepare("SELECT COALESCE(SUM(payout_sats), 0) as total FROM claims WHERE status = 'paid' AND claimed_at >= ?") + .get(sinceTs) as { total: number }; + return row?.total ?? 0; + }, + + async getRecentPayouts( + limit: number + ): Promise<{ pubkey_prefix: string; payout_sats: number; claimed_at: number }[]> { + const rows = db + .prepare( + "SELECT pubkey, payout_sats, claimed_at FROM claims WHERE status = 'paid' ORDER BY claimed_at DESC LIMIT ?" + ) + .all(limit) as { pubkey: string; payout_sats: number; claimed_at: number }[]; + return rows.map((r) => ({ + pubkey_prefix: r.pubkey.slice(0, 8) + "…", + payout_sats: r.payout_sats, + claimed_at: r.claimed_at, + })); + }, + + async insertDeposit( + amountSats: number, + source: DepositSource, + lnbitsPaymentHash?: string | null, + createdAt?: number + ): Promise { + const now = createdAt ?? Math.floor(Date.now() / 1000); + db.prepare( + "INSERT INTO deposits (created_at, amount_sats, source, lnbits_payment_hash) VALUES (?, ?, ?, ?)" + ).run(now, amountSats, source, lnbitsPaymentHash ?? null); + }, + + async hasDepositWithPaymentHash(paymentHash: string): Promise { + const row = db + .prepare("SELECT 1 FROM deposits WHERE lnbits_payment_hash = ? LIMIT 1") + .get(paymentHash); + return !!row; + }, + + async updateDepositCreatedAtIfMissing(paymentHash: string, createdAt: number): Promise { + const result = db + .prepare( + "UPDATE deposits SET created_at = ? WHERE lnbits_payment_hash = ? AND (created_at IS NULL OR created_at < 1000000000)" + ) + .run(createdAt, paymentHash); + return result.changes > 0; + }, + + async getRecentDeposits( + limit: number + ): Promise<{ amount_sats: number; source: DepositSource; created_at: number }[]> { + const rows = db + .prepare( + "SELECT amount_sats, source, created_at FROM deposits ORDER BY created_at DESC LIMIT ?" + ) + .all(limit) as { amount_sats: number; source: DepositSource; created_at: number }[]; + return rows.map((r) => ({ + amount_sats: r.amount_sats, + source: r.source as DepositSource, + created_at: r.created_at, + })); + }, + }; +} diff --git a/backend/src/db/types.ts b/backend/src/db/types.ts new file mode 100644 index 0000000..336a5d2 --- /dev/null +++ b/backend/src/db/types.ts @@ -0,0 +1,101 @@ +export interface UserRow { + pubkey: string; + nostr_first_seen_at: number | null; + notes_count: number; + followers_count: number; + following_count: number; + activity_score: number; + last_metadata_fetch_at: number | null; + lightning_address: string | null; + name: string | null; + created_at: number; + updated_at: number; +} + +export interface ClaimRow { + id: number; + pubkey: string; + claimed_at: number; + payout_sats: number; + ip_hash: string; + payout_destination_hash: string | null; + status: "pending" | "paid" | "failed"; + lnbits_payment_hash: string | null; + error_message: string | null; +} + +export interface QuoteRow { + quote_id: string; + pubkey: string; + payout_sats: number; + lightning_address: string | null; + created_at: number; + expires_at: number; + status: "active" | "consumed" | "expired"; +} + +export interface IpLimitRow { + ip_hash: string; + last_claimed_at: number; + claim_count_period: number; +} + +export type DepositSource = "lightning" | "cashu"; + +export interface DepositRow { + id: number; + created_at: number; + amount_sats: number; + source: DepositSource; +} + +export interface Db { + runMigrations(): Promise; + + getUser(pubkey: string): Promise; + upsertUser(row: Omit): Promise; + updateUserNostrCache( + pubkey: string, + data: { + nostr_first_seen_at: number | null; + notes_count: number; + followers_count: number; + following_count: number; + activity_score: number; + last_metadata_fetch_at: number; + } + ): Promise; + + getLastSuccessfulClaimByPubkey(pubkey: string): Promise; + getLastClaimByIpHash(ipHash: string): Promise; + getClaimCountForIpSince(ipHash: string, sinceTs: number): Promise; + createClaim(row: Omit): Promise; + updateClaimStatus(id: number, status: ClaimRow["status"], lnbitsPaymentHash?: string, errorMessage?: string): Promise; + + getIpLimit(ipHash: string): Promise; + upsertIpLimit(ipHash: string, lastClaimedAt: number, claimCountPeriod: number): Promise; + + createQuote(quoteId: string, pubkey: string, payoutSats: number, lightningAddress: string, expiresAt: number): Promise; + getQuote(quoteId: string): Promise; + consumeQuote(quoteId: string): Promise; + + setNonce(nonce: string, expiresAt: number): Promise; + hasNonce(nonce: string): Promise; + deleteExpiredNonces(): Promise; + + getTotalPaidSats(): Promise; + getTotalClaimsCount(): Promise; + getClaimsCountSince(sinceTs: number): Promise; + getPaidSatsSince(sinceTs: number): Promise; + getRecentPayouts(limit: number): Promise<{ pubkey_prefix: string; payout_sats: number; claimed_at: number }[]>; + + insertDeposit( + amountSats: number, + source: DepositSource, + lnbitsPaymentHash?: string | null, + createdAt?: number + ): Promise; + hasDepositWithPaymentHash(paymentHash: string): Promise; + updateDepositCreatedAtIfMissing(paymentHash: string, createdAt: number): Promise; + getRecentDeposits(limit: number): Promise<{ amount_sats: number; source: DepositSource; created_at: number }[]>; +} diff --git a/backend/src/index.ts b/backend/src/index.ts new file mode 100644 index 0000000..02f1040 --- /dev/null +++ b/backend/src/index.ts @@ -0,0 +1,64 @@ +import express from "express"; +import cors from "cors"; +import rateLimit from "express-rate-limit"; +import { config } from "./config.js"; +import { getDb } from "./db/index.js"; +import { startLnbitsDepositSync } from "./services/syncLnbitsDeposits.js"; +import publicRoutes from "./routes/public.js"; +import authRoutes from "./routes/auth.js"; +import claimRoutes from "./routes/claim.js"; +import userRoutes from "./routes/user.js"; + +async function main() { + const db = getDb(); + await db.runMigrations(); + db.deleteExpiredNonces().catch(() => {}); + + const app = express(); + if (config.trustProxy) app.set("trust proxy", 1); + app.use(express.json({ limit: "10kb" })); + app.use( + cors({ + origin: (origin, cb) => { + if (!origin) return cb(null, true); + if (origin.startsWith("http://localhost:") || origin.startsWith("http://127.0.0.1:")) return cb(null, true); + if (config.allowedOrigins.includes(origin)) return cb(null, true); + return cb(null, false); + }, + credentials: true, + }) + ); + + app.use("/", publicRoutes); + app.use("/auth", authRoutes); + app.use( + "/claim", + rateLimit({ + windowMs: 60 * 1000, + max: 20, + message: { code: "rate_limited", message: "Too many requests." }, + }), + claimRoutes + ); + app.use( + "/user", + rateLimit({ + windowMs: 60 * 1000, + max: 30, + message: { code: "rate_limited", message: "Too many requests." }, + }), + userRoutes + ); + + app.listen(config.port, () => { + console.log(`Faucet API listening on port ${config.port}`); + if (config.lnbitsBaseUrl && config.lnbitsAdminKey) { + startLnbitsDepositSync(); + } + }); +} + +main().catch((err) => { + console.error(err); + process.exit(1); +}); diff --git a/backend/src/middleware/auth.ts b/backend/src/middleware/auth.ts new file mode 100644 index 0000000..77a9dd3 --- /dev/null +++ b/backend/src/middleware/auth.ts @@ -0,0 +1,22 @@ +import { Request, Response, NextFunction } from "express"; +import { verifyJwt } from "../auth/jwt.js"; +import { nip98Auth } from "./nip98.js"; + +const BEARER_PREFIX = "Bearer "; + +/** + * Accept either Bearer JWT or NIP-98. Sets req.nostr = { pubkey }. + */ +export function authOrNip98(req: Request, res: Response, next: NextFunction): void { + const auth = req.headers.authorization; + if (auth?.startsWith(BEARER_PREFIX)) { + const token = auth.slice(BEARER_PREFIX.length).trim(); + const payload = verifyJwt(token); + if (payload) { + req.nostr = { pubkey: payload.pubkey, eventId: "" }; + next(); + return; + } + } + nip98Auth(req, res, next); +} diff --git a/backend/src/middleware/ip.ts b/backend/src/middleware/ip.ts new file mode 100644 index 0000000..15f59a7 --- /dev/null +++ b/backend/src/middleware/ip.ts @@ -0,0 +1,40 @@ +import { Request, Response, NextFunction } from "express"; +import { createHmac } from "crypto"; +import { config } from "../config.js"; + +declare global { + namespace Express { + interface Request { + ipHash?: string; + } + } +} + +/** + * Resolve client IP: X-Forwarded-For (first hop) when TRUST_PROXY, else socket remoteAddress. + */ +function getClientIp(req: Request): string { + if (config.trustProxy) { + const forwarded = req.headers["x-forwarded-for"]; + if (forwarded) { + const first = typeof forwarded === "string" ? forwarded.split(",")[0] : forwarded[0]; + const ip = first?.trim(); + if (ip) return ip; + } + } + const addr = req.socket?.remoteAddress; + return addr ?? "0.0.0.0"; +} + +/** + * HMAC-SHA256(ip, HMAC_IP_SECRET) as hex. + */ +function hmacIp(ip: string): string { + return createHmac("sha256", config.hmacIpSecret).update(ip).digest("hex"); +} + +export function ipHashMiddleware(req: Request, _res: Response, next: NextFunction): void { + const ip = getClientIp(req); + req.ipHash = hmacIp(ip); + next(); +} diff --git a/backend/src/middleware/nip98.ts b/backend/src/middleware/nip98.ts new file mode 100644 index 0000000..8e79583 --- /dev/null +++ b/backend/src/middleware/nip98.ts @@ -0,0 +1,153 @@ +import { Request, Response, NextFunction } from "express"; +import { verifyEvent, getEventHash } from "nostr-tools"; +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; + +const AUTH_SCHEME = "Nostr "; + +export interface NostrAuthPayload { + pubkey: string; + eventId: string; +} + +declare global { + namespace Express { + interface Request { + nostr?: NostrAuthPayload; + } + } +} + +function getTag(event: { tags: string[][] }, name: string): string | null { + const row = event.tags.find((t) => t[0] === name); + return row && row[1] ? row[1] : null; +} + +export async function nip98Auth(req: Request, res: Response, next: NextFunction): Promise { + const auth = req.headers.authorization; + if (!auth || !auth.startsWith(AUTH_SCHEME)) { + res.status(401).json({ + code: "invalid_nip98", + message: "Missing or invalid Authorization header. Use NIP-98 Nostr scheme.", + }); + return; + } + + const base64 = auth.slice(AUTH_SCHEME.length).trim(); + let event: { id: string; pubkey: string; kind: number; created_at: number; tags: string[][]; content: string; sig: string }; + try { + const decoded = Buffer.from(base64, "base64").toString("utf-8"); + const parsed = JSON.parse(decoded) as Record; + event = { + id: String(parsed.id ?? ""), + pubkey: String(parsed.pubkey ?? ""), + kind: Number(parsed.kind), + created_at: Number(parsed.created_at), + tags: Array.isArray(parsed.tags) ? (parsed.tags as string[][]) : [], + content: typeof parsed.content === "string" ? parsed.content : "", + sig: String(parsed.sig ?? ""), + }; + } catch { + res.status(401).json({ + code: "invalid_nip98", + message: "Invalid NIP-98 payload: not valid base64 or JSON.", + }); + return; + } + + if (event.kind !== 27235) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 event kind must be 27235.", + }); + return; + } + + const now = Math.floor(Date.now() / 1000); + if (Math.abs(event.created_at - now) > config.nip98MaxSkewSeconds) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 event timestamp is outside allowed window.", + }); + return; + } + + const u = getTag(event, "u"); + const method = getTag(event, "method"); + if (!u || !method) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 event must include 'u' and 'method' tags.", + }); + return; + } + + // Reconstruct absolute URL (protocol + host + path + query) + const proto = req.headers["x-forwarded-proto"] ?? (req.socket as { encrypted?: boolean }).encrypted ? "https" : "http"; + const host = req.headers["x-forwarded-host"] ?? req.headers.host ?? ""; + const path = req.originalUrl ?? req.url; + const absoluteUrl = `${proto}://${host}${path}`; + if (u !== absoluteUrl) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 'u' tag does not match request URL.", + }); + return; + } + + if (method.toUpperCase() !== req.method) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 'method' tag does not match request method.", + }); + return; + } + + const computedId = getEventHash({ + kind: event.kind, + pubkey: event.pubkey, + created_at: event.created_at, + tags: event.tags, + content: event.content, + sig: event.sig, + } as Parameters[0]); + if (computedId !== event.id) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 event id does not match computed hash.", + }); + return; + } + + const valid = verifyEvent({ + id: event.id, + kind: event.kind, + pubkey: event.pubkey, + created_at: event.created_at, + tags: event.tags, + content: event.content, + sig: event.sig, + } as Parameters[0]); + if (!valid) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 signature verification failed.", + }); + return; + } + + const db = getDb(); + const hasNonce = await db.hasNonce(event.id); + if (hasNonce) { + res.status(401).json({ + code: "invalid_nip98", + message: "NIP-98 nonce already used (replay).", + }); + return; + } + + const expiresAt = now + config.nonceTtlSeconds; + await db.setNonce(event.id, expiresAt); + req.nostr = { pubkey: event.pubkey, eventId: event.id }; + next(); +} diff --git a/backend/src/routes/auth.ts b/backend/src/routes/auth.ts new file mode 100644 index 0000000..64b2072 --- /dev/null +++ b/backend/src/routes/auth.ts @@ -0,0 +1,29 @@ +import { Router, Request, Response } from "express"; +import { nip98Auth } from "../middleware/nip98.js"; +import { signJwt, verifyJwt } from "../auth/jwt.js"; + +const router = Router(); + +/** Sign in with NIP-98 once; returns a JWT for subsequent requests. */ +router.post("/login", nip98Auth, (req: Request, res: Response) => { + const pubkey = req.nostr!.pubkey; + const token = signJwt(pubkey); + res.json({ token, pubkey }); +}); + +/** Return current user from JWT (Bearer only). Used to restore session. */ +router.get("/me", (req: Request, res: Response) => { + const auth = req.headers.authorization; + if (!auth?.startsWith("Bearer ")) { + res.status(401).json({ code: "unauthorized", message: "Bearer token required." }); + return; + } + const payload = verifyJwt(auth.slice(7).trim()); + if (!payload) { + res.status(401).json({ code: "invalid_token", message: "Invalid or expired token." }); + return; + } + res.json({ pubkey: payload.pubkey }); +}); + +export default router; diff --git a/backend/src/routes/claim.ts b/backend/src/routes/claim.ts new file mode 100644 index 0000000..afbbed5 --- /dev/null +++ b/backend/src/routes/claim.ts @@ -0,0 +1,159 @@ +import { Router, Request, Response } from "express"; +import { createHmac } from "crypto"; +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; +import { checkEligibility } from "../services/eligibility.js"; +import { createQuote } from "../services/quote.js"; +import { payToLightningAddress } from "../services/lnbits.js"; +import { authOrNip98 } from "../middleware/auth.js"; +import { ipHashMiddleware } from "../middleware/ip.js"; + +const router = Router(); + +router.use(ipHashMiddleware); + +function hashDestination(lightningAddress: string): string { + return createHmac("sha256", config.hmacIpSecret).update(lightningAddress).digest("hex"); +} + +function parseLightningAddress(body: unknown): string | null { + if (body && typeof body === "object" && "lightning_address" in body && typeof (body as { lightning_address: unknown }).lightning_address === "string") { + const v = (body as { lightning_address: string }).lightning_address.trim(); + if (/^[^@]+@[^@]+$/.test(v)) return v; + } + return null; +} + +router.post("/quote", authOrNip98, async (req: Request, res: Response) => { + const pubkey = req.nostr!.pubkey; + const ipHash = req.ipHash!; + const lightningAddress = parseLightningAddress(req.body); + if (!lightningAddress) { + res.status(400).json({ + code: "invalid_lightning_address", + message: "Valid lightning_address (user@domain) is required.", + }); + return; + } + + const eligibility = await checkEligibility(pubkey, ipHash); + if (!eligibility.eligible) { + res.status(403).json({ + code: eligibility.denialCode, + message: eligibility.denialMessage, + next_eligible_at: eligibility.nextEligibleAt, + }); + return; + } + + const quote = await createQuote(pubkey, lightningAddress); + if (!quote) { + res.status(403).json({ + code: "daily_budget_exceeded", + message: "Daily budget reached. Try again tomorrow.", + }); + return; + } + + res.json({ + quote_id: quote.quoteId, + payout_sats: quote.payoutSats, + expires_at: quote.expiresAt, + }); +}); + +router.post("/confirm", authOrNip98, async (req: Request, res: Response) => { + const pubkey = req.nostr!.pubkey; + const ipHash = req.ipHash!; + const quoteId = typeof req.body?.quote_id === "string" ? req.body.quote_id.trim() : null; + if (!quoteId) { + res.status(400).json({ + code: "invalid_request", + message: "quote_id is required.", + }); + return; + } + + const db = getDb(); + const quote = await db.getQuote(quoteId); + if (!quote) { + res.status(404).json({ + code: "quote_expired", + message: "Quote not found or expired.", + }); + return; + } + if (quote.pubkey !== pubkey) { + res.status(403).json({ + code: "invalid_nip98", + message: "Quote does not belong to this pubkey.", + }); + return; + } + if (quote.status !== "active") { + res.status(200).json({ + success: true, + already_consumed: true, + message: "This quote was already used.", + payout_sats: quote.payout_sats, + next_eligible_at: undefined, + }); + return; + } + const now = Math.floor(Date.now() / 1000); + if (quote.expires_at < now) { + res.status(400).json({ + code: "quote_expired", + message: "Quote has expired.", + }); + return; + } + + const lightningAddress = quote.lightning_address; + if (!lightningAddress) { + res.status(400).json({ + code: "invalid_lightning_address", + message: "Quote has no payout address.", + }); + return; + } + + const claimId = await db.createClaim({ + pubkey: quote.pubkey, + claimed_at: now, + payout_sats: quote.payout_sats, + ip_hash: ipHash, + payout_destination_hash: hashDestination(lightningAddress), + status: "pending", + lnbits_payment_hash: null, + error_message: null, + }); + + try { + const { paymentHash } = await payToLightningAddress(lightningAddress, quote.payout_sats); + await db.updateClaimStatus(claimId, "paid", paymentHash); + await db.consumeQuote(quoteId); + const cooldownEnd = now + config.cooldownDays * 86400; + const ipSince = now - config.ipCooldownDays * 86400; + const ipCount = await db.getClaimCountForIpSince(ipHash, ipSince); + await db.upsertIpLimit(ipHash, now, ipCount); + res.json({ + success: true, + payout_sats: quote.payout_sats, + next_eligible_at: cooldownEnd, + }); + } catch (err) { + const message = err instanceof Error ? err.message : "Payment failed"; + const stack = err instanceof Error ? err.stack : undefined; + console.error("[claim/confirm] Lightning payment failed:", message); + if (stack) console.error("[claim/confirm] Stack:", stack); + await db.updateClaimStatus(claimId, "failed", undefined, message); + res.status(502).json({ + code: "payout_failed", + message: "Lightning payment failed. Your cooldown was not applied.", + details: message, + }); + } +}); + +export default router; diff --git a/backend/src/routes/public.ts b/backend/src/routes/public.ts new file mode 100644 index 0000000..2a3a700 --- /dev/null +++ b/backend/src/routes/public.ts @@ -0,0 +1,134 @@ +import { Router, Request, Response } from "express"; +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; +import { getWalletBalanceSats } from "../services/lnbits.js"; + +const router = Router(); + +router.get("/health", (_req: Request, res: Response) => { + res.json({ status: "ok" }); +}); + +router.get("/config", (_req: Request, res: Response) => { + res.json({ + faucetEnabled: config.faucetEnabled, + emergencyStop: config.emergencyStop, + cooldownDays: config.cooldownDays, + minAccountAgeDays: config.minAccountAgeDays, + minActivityScore: config.minActivityScore, + faucetMinSats: config.faucetMinSats, + faucetMaxSats: config.faucetMaxSats, + }); +}); + +router.get("/stats", async (_req: Request, res: Response) => { + try { + const db = getDb(); + const [balance, totalPaid, totalClaims, claims24h, recent, recentDeposits] = await Promise.all([ + getWalletBalanceSats().catch(() => 0), + db.getTotalPaidSats(), + db.getTotalClaimsCount(), + db.getClaimsCountSince(Math.floor(Date.now() / 1000) - 86400), + db.getRecentPayouts(20), + db.getRecentDeposits(20), + ]); + res.json({ + balanceSats: balance, + totalPaidSats: totalPaid, + totalClaims, + claimsLast24h: claims24h, + dailyBudgetSats: config.dailyBudgetSats, + recentPayouts: recent, + recentDeposits, + }); + } catch (e) { + res.status(500).json({ + code: "internal_error", + message: "Failed to load stats", + }); + } +}); + +router.get("/deposit", (_req: Request, res: Response) => { + res.json({ + lightningAddress: config.depositLightningAddress, + lnurlp: config.depositLnurlp, + }); +}); + +router.post("/deposit/redeem-cashu", async (req: Request, res: Response) => { + const token = typeof req.body?.token === "string" ? req.body.token.trim() : null; + if (!token || !token.toLowerCase().startsWith("cashu")) { + res.status(400).json({ + success: false, + error: "Valid Cashu token (cashuA... or cashuB...) is required.", + }); + return; + } + const lightningAddress = config.depositLightningAddress; + if (!lightningAddress || !/^[^@]+@[^@]+$/.test(lightningAddress)) { + res.status(503).json({ + success: false, + error: "Faucet deposit Lightning address is not configured.", + }); + return; + } + const redeemUrl = `${config.cashuRedeemApiUrl}/api/redeem`; + try { + const redeemRes = await fetch(redeemUrl, { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ token, lightningAddress }), + }); + const data = (await redeemRes.json().catch(() => ({}))) as { + success?: boolean; + error?: string; + errorType?: string; + paid?: boolean; + amount?: number; + invoiceAmount?: number; + to?: string; + netAmount?: number; + message?: string; + }; + if (!redeemRes.ok) { + const status = redeemRes.status >= 500 ? 502 : redeemRes.status; + res.status(status).json({ + success: false, + error: data.error ?? `Redeem failed: ${redeemRes.status}`, + ...(data.errorType && { errorType: data.errorType }), + }); + return; + } + if (!data.success) { + res.status(400).json({ + success: false, + error: data.error ?? "Redeem failed", + ...(data.errorType && { errorType: data.errorType }), + }); + return; + } + const amountSats = typeof data.amount === "number" && data.amount > 0 ? data.amount : data.netAmount; + if (typeof amountSats === "number" && amountSats > 0) { + getDb().insertDeposit(amountSats, "cashu").catch((err) => console.error("[deposit] record deposit", err)); + } + res.json({ + success: true, + paid: data.paid, + amount: data.amount, + invoiceAmount: data.invoiceAmount, + netAmount: data.netAmount, + to: data.to ?? lightningAddress, + message: data.message, + }); + } catch (e) { + const message = e instanceof Error ? e.message : "Redeem request failed"; + console.error("[deposit/redeem-cashu]", message); + res.status(502).json({ + success: false, + error: message, + }); + } +}); + +export default router; diff --git a/backend/src/routes/user.ts b/backend/src/routes/user.ts new file mode 100644 index 0000000..4eb717d --- /dev/null +++ b/backend/src/routes/user.ts @@ -0,0 +1,30 @@ +import { Router, Request, Response } from "express"; +import { getDb } from "../db/index.js"; +import { fetchAndScorePubkey } from "../services/nostr.js"; +import { authOrNip98 } from "../middleware/auth.js"; + +const router = Router(); + +/** + * Refresh Nostr profile (kind 0) and return cached lightning_address and name. + * Pre-fills the frontend and stores in DB. + */ +router.post("/refresh-profile", authOrNip98, async (req: Request, res: Response) => { + const pubkey = req.nostr!.pubkey; + try { + await fetchAndScorePubkey(pubkey, true); + const db = getDb(); + const user = await db.getUser(pubkey); + res.json({ + lightning_address: user?.lightning_address ?? null, + name: user?.name ?? null, + }); + } catch (e) { + res.status(500).json({ + code: "profile_fetch_failed", + message: e instanceof Error ? e.message : "Failed to fetch profile", + }); + } +}); + +export default router; diff --git a/backend/src/services/eligibility.ts b/backend/src/services/eligibility.ts new file mode 100644 index 0000000..2c939db --- /dev/null +++ b/backend/src/services/eligibility.ts @@ -0,0 +1,126 @@ +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; +import { getWalletBalanceSats } from "./lnbits.js"; +import { fetchAndScorePubkey } from "./nostr.js"; + +export type DenialCode = + | "faucet_disabled" + | "emergency_stop" + | "insufficient_balance" + | "daily_budget_exceeded" + | "cooldown_pubkey" + | "cooldown_ip" + | "account_too_new" + | "low_activity" + | "invalid_nip98" + | "invalid_lightning_address" + | "quote_expired" + | "payout_failed"; + +export interface EligibilityResult { + eligible: boolean; + denialCode?: DenialCode; + denialMessage?: string; + nextEligibleAt?: number; +} + +const SECONDS_PER_DAY = 86400; + +export async function checkEligibility(pubkey: string, ipHash: string): Promise { + if (config.emergencyStop) { + return { + eligible: false, + denialCode: "emergency_stop", + denialMessage: "The faucet is temporarily in maintenance. Please try again later.", + }; + } + + if (!config.faucetEnabled) { + return { + eligible: false, + denialCode: "faucet_disabled", + denialMessage: "The faucet is currently disabled.", + }; + } + + let balanceSats: number; + try { + balanceSats = await getWalletBalanceSats(); + } catch { + return { + eligible: false, + denialCode: "insufficient_balance", + denialMessage: "Unable to check faucet balance. Please try again later.", + }; + } + + if (balanceSats < config.faucetMinSats) { + return { + eligible: false, + denialCode: "insufficient_balance", + denialMessage: balanceSats === 0 + ? "The faucet pool is empty. Donations welcome!" + : `The faucet pool is too low to pay out (${balanceSats} sats). Donations welcome!`, + }; + } + + const db = getDb(); + + const lastPubkeyClaim = await db.getLastSuccessfulClaimByPubkey(pubkey); + const cooldownEnd = lastPubkeyClaim + ? lastPubkeyClaim.claimed_at + config.cooldownDays * SECONDS_PER_DAY + : 0; + const now = Math.floor(Date.now() / 1000); + if (cooldownEnd > now) { + return { + eligible: false, + denialCode: "cooldown_pubkey", + denialMessage: "You have already claimed recently.", + nextEligibleAt: cooldownEnd, + }; + } + + const ipSince = now - config.ipCooldownDays * SECONDS_PER_DAY; + const ipClaimCount = await db.getClaimCountForIpSince(ipHash, ipSince); + if (ipClaimCount >= config.maxClaimsPerIpPerPeriod) { + const lastIpClaim = await db.getLastClaimByIpHash(ipHash); + const ipNextAt = lastIpClaim ? lastIpClaim.claimed_at + config.ipCooldownDays * SECONDS_PER_DAY : 0; + return { + eligible: false, + denialCode: "cooldown_ip", + denialMessage: "This IP has reached the claim limit for this period.", + nextEligibleAt: ipNextAt, + }; + } + + const profile = await fetchAndScorePubkey(pubkey); + const minAgeSec = config.minAccountAgeDays * SECONDS_PER_DAY; + const cutoff = now - minAgeSec; + if (profile.nostrFirstSeenAt === null || profile.nostrFirstSeenAt > cutoff) { + return { + eligible: false, + denialCode: "account_too_new", + denialMessage: `Your Nostr account must be at least ${config.minAccountAgeDays} days old.`, + }; + } + + if (profile.activityScore < config.minActivityScore) { + return { + eligible: false, + denialCode: "low_activity", + denialMessage: `Your account does not meet the minimum activity score (${config.minActivityScore}). Be more active on Nostr and try again.`, + }; + } + + const since24h = now - 86400; + const claims24h = await db.getClaimsCountSince(since24h); + if (claims24h >= config.maxClaimsPerDay) { + return { + eligible: false, + denialCode: "daily_budget_exceeded", + denialMessage: "Daily claim limit reached. Try again tomorrow.", + }; + } + + return { eligible: true }; +} diff --git a/backend/src/services/lnbits.ts b/backend/src/services/lnbits.ts new file mode 100644 index 0000000..c0d4c61 --- /dev/null +++ b/backend/src/services/lnbits.ts @@ -0,0 +1,190 @@ +import { config } from "../config.js"; + +const base = config.lnbitsBaseUrl; +const adminKey = config.lnbitsAdminKey; +const walletId = config.lnbitsWalletId; + +export async function getWalletBalanceSats(): Promise { + const res = await fetch(`${base}/api/v1/wallet`, { + headers: { "X-Api-Key": adminKey }, + }); + if (!res.ok) { + const text = await res.text(); + throw new Error(`LNbits wallet fetch failed: ${res.status} ${text}`); + } + const data = (await res.json()) as { balance?: number }; + return Math.floor((data.balance ?? 0) / 1000); +} + +/** + * Pay to a Lightning address via LNURL. + * 1. Resolve Lightning address to LNURL (GET https://domain/.well-known/lnurlp/user) + * 2. Call callback with amount in millisats + */ +export async function payToLightningAddress( + lightningAddress: string, + sats: number +): Promise<{ paymentHash: string }> { + const [user, domain] = lightningAddress.split("@"); + if (!user || !domain) { + console.error("[lnbits] Invalid Lightning address format:", lightningAddress); + throw new Error("Invalid Lightning address format"); + } + + const lnurlpUrl = `https://${domain}/.well-known/lnurlp/${user}`; + const lnurlRes = await fetch(lnurlpUrl); + if (!lnurlRes.ok) { + const text = await lnurlRes.text(); + console.error("[lnbits] LNURLp resolution failed:", { + lightningAddress, + lnurlpUrl, + status: lnurlRes.status, + statusText: lnurlRes.statusText, + body: text.slice(0, 500), + }); + throw new Error(`Could not resolve Lightning address: ${lnurlRes.status} ${text.slice(0, 200)}`); + } + const lnurlData = (await lnurlRes.json()) as { callback?: string; minSendable?: number; maxSendable?: number }; + const callback = lnurlData.callback; + if (!callback) { + console.error("[lnbits] No callback in LNURLp response:", { lightningAddress, lnurlpUrl, lnurlData }); + throw new Error("No callback in LNURLp"); + } + + const millisats = sats * 1000; + const separator = callback.includes("?") ? "&" : "?"; + const payReqUrl = `${callback}${separator}amount=${millisats}`; + const payRes = await fetch(payReqUrl); + const payBody = await payRes.text(); + if (!payRes.ok) { + let parsed: unknown; + try { + parsed = JSON.parse(payBody); + } catch { + parsed = payBody; + } + console.error("[lnbits] LNURL pay request failed:", { + lightningAddress, + sats, + millisats, + callbackHost: new URL(callback).host, + status: payRes.status, + statusText: payRes.statusText, + body: parsed, + }); + const detail = typeof parsed === "object" && parsed !== null && "reason" in parsed + ? (parsed as { reason?: string }).reason + : payBody.slice(0, 300); + throw new Error(`LNURL pay request failed: ${payRes.status} ${detail}`); + } + const payData = JSON.parse(payBody) as { pr?: string; reason?: string }; + const pr = payData.pr; + if (!pr) { + console.error("[lnbits] No invoice (pr) in pay response:", { lightningAddress, payData }); + throw new Error(`No invoice in pay response: ${payData.reason ?? JSON.stringify(payData).slice(0, 200)}`); + } + + const payResult = await fetch(`${base}/api/v1/payments`, { + method: "POST", + headers: { "Content-Type": "application/json", "X-Api-Key": adminKey }, + body: JSON.stringify({ out: true, bolt11: pr }), + }); + if (!payResult.ok) { + const errText = await payResult.text(); + console.error("[lnbits] LNbits bolt11 payment failed:", { + lightningAddress, + sats, + status: payResult.status, + body: errText.slice(0, 500), + }); + throw new Error(`LNbits pay failed: ${payResult.status} ${errText}`); + } + const result = (await payResult.json()) as { payment_hash?: string }; + return { paymentHash: result.payment_hash ?? "" }; +} + +/** LNbits payment list item (GET /api/v1/payments). Amount in millisatoshis; positive = incoming, negative = outgoing. */ +/** Per LNbits OpenAPI: time, created_at, updated_at are "string" format "date-time" (ISO 8601). */ +export interface LnbitsPaymentItem { + payment_hash?: string; + amount?: number; + pending?: boolean; + time?: number | string; + created_at?: number | string; + updated_at?: number | string; + timestamp?: number; + date?: number; + [key: string]: unknown; +} + +const MIN_VALID_UNIX = 1e9; + +function parsePaymentTime(raw: unknown): number { + if (raw == null) return 0; + if (typeof raw === "number") { + const ts = raw > 1e12 ? Math.floor(raw / 1000) : raw; + return ts >= MIN_VALID_UNIX ? ts : 0; + } + if (typeof raw === "string") { + const ms = Date.parse(raw); + if (Number.isNaN(ms)) return 0; + return Math.floor(ms / 1000); + } + return 0; +} + +function normalizePaymentTime(p: LnbitsPaymentItem): number { + const ts = + parsePaymentTime(p.time) || + parsePaymentTime(p.created_at) || + parsePaymentTime(p.updated_at) || + parsePaymentTime(p.timestamp) || + parsePaymentTime(p.date); + if (ts >= MIN_VALID_UNIX) return ts; + return Math.floor(Date.now() / 1000); +} + +/** + * Fetch recent payments from LNbits and return paid incoming ones (amount > 0, not pending). + * LNbits returns amount in millisatoshis; we convert to sats for storage. + */ +export async function getIncomingPaymentsFromLnbits(limit = 100): Promise< + { payment_hash: string; amount_sats: number; paid_at: number }[] +> { + const res = await fetch( + `${base}/api/v1/payments?limit=${limit}&sortby=time&direction=desc`, + { headers: { "X-Api-Key": adminKey } } + ); + if (!res.ok) { + const text = await res.text(); + throw new Error(`LNbits payments list failed: ${res.status} ${text}`); + } + const data = (await res.json()) as LnbitsPaymentItem[] | { detail?: string; payments?: LnbitsPaymentItem[] }; + let items: LnbitsPaymentItem[]; + if (Array.isArray(data)) { + items = data; + } else if (data && typeof data === "object" && Array.isArray((data as { payments?: LnbitsPaymentItem[] }).payments)) { + items = (data as { payments: LnbitsPaymentItem[] }).payments; + } else { + const detail = (data as { detail?: string })?.detail; + throw new Error(detail ?? "LNbits payments list invalid response"); + } + const incoming: { payment_hash: string; amount_sats: number; paid_at: number }[] = []; + for (const p of items) { + const hash = p.payment_hash; + const amountMsats = Number(p.amount ?? 0); + const pending = Boolean(p.pending); + const paidAt = normalizePaymentTime(p); + if (!hash || typeof hash !== "string") continue; + if (pending) continue; + if (amountMsats <= 0) continue; + const amountSats = Math.floor(amountMsats / 1000); + if (amountSats <= 0) continue; + incoming.push({ + payment_hash: hash, + amount_sats: amountSats, + paid_at: paidAt, + }); + } + return incoming; +} diff --git a/backend/src/services/nostr.ts b/backend/src/services/nostr.ts new file mode 100644 index 0000000..4c399d8 --- /dev/null +++ b/backend/src/services/nostr.ts @@ -0,0 +1,150 @@ +import { SimplePool } from "nostr-tools"; +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; + +const pool = new SimplePool(); + +export interface NostrProfile { + nostrFirstSeenAt: number | null; + notesCount: number; + followingCount: number; + followersCount: number; + activityScore: number; +} + +function withTimeout(promise: Promise, ms: number): Promise { + return Promise.race([ + promise, + new Promise((_, rej) => setTimeout(() => rej(new Error("timeout")), ms)), + ]); +} + +/** + * Fetch events from relays in parallel (kinds 0, 1, 3), compute metrics, optionally cache. + * When forceRefreshProfile is true, always fetch from relays (skip cache) so kind 0 is parsed and lightning_address/name updated. + */ +export async function fetchAndScorePubkey(pubkey: string, forceRefreshProfile = false): Promise { + const db = getDb(); + const cached = await db.getUser(pubkey); + const nowSec = Math.floor(Date.now() / 1000); + const cacheHours = config.metadataCacheHours; + const cacheValidUntil = (cached?.last_metadata_fetch_at ?? 0) + cacheHours * 3600; + + if (!forceRefreshProfile && cached && cacheValidUntil > nowSec) { + return { + nostrFirstSeenAt: cached.nostr_first_seen_at, + notesCount: cached.notes_count, + followingCount: cached.following_count, + followersCount: cached.followers_count, + activityScore: cached.activity_score, + }; + } + + let events: { kind: number; created_at: number; content?: string; tags: string[][] }[] = []; + try { + const result = await withTimeout( + pool.querySync(config.nostrRelays, { kinds: [0, 1, 3], authors: [pubkey], limit: config.maxEventsFetch }), + config.relayTimeoutMs + ); + events = Array.isArray(result) ? result : []; + } catch (_) { + // Timeout or relay error: use cache if any; otherwise upsert minimal user so /refresh-profile returns a row + if (cached) { + return { + nostrFirstSeenAt: cached.nostr_first_seen_at, + notesCount: cached.notes_count, + followingCount: cached.following_count, + followersCount: cached.followers_count, + activityScore: cached.activity_score, + }; + } + const lastMetadataFetchAt = Math.floor(Date.now() / 1000); + await db.upsertUser({ + pubkey, + nostr_first_seen_at: null, + notes_count: 0, + followers_count: 0, + following_count: 0, + activity_score: 0, + last_metadata_fetch_at: lastMetadataFetchAt, + lightning_address: null, + name: null, + }); + return { + nostrFirstSeenAt: null, + notesCount: 0, + followingCount: 0, + followersCount: 0, + activityScore: 0, + }; + } + + const kind0 = events.filter((e) => e.kind === 0); + const kind1 = events.filter((e) => e.kind === 1); + const kind3 = events.filter((e) => e.kind === 3); + + const earliestCreatedAt = events.length + ? Math.min(...events.map((e) => e.created_at)) + : null; + + const lookbackSince = nowSec - config.activityLookbackDays * 86400; + const notesInLookback = kind1.filter((e) => e.created_at >= lookbackSince).length; + + let followingCount = 0; + if (kind3.length > 0) { + const contacts = kind3[0].tags?.filter((t) => t[0] === "p").length ?? 0; + followingCount = contacts; + } + + const hasMetadata = kind0.length > 0; + let score = 0; + if (hasMetadata) score += 10; + if (notesInLookback >= config.minNotesCount) score += 20; + if (followingCount >= config.minFollowingCount) score += 10; + if (0 >= config.minFollowersCount) score += 10; // followers not fetched for MVP; treat as 0 + + let lightning_address: string | null = null; + let name: string | null = null; + const lightningAddressRe = /^[^@]+@[^@]+$/; + if (kind0.length > 0 && kind0[0].content) { + try { + const meta = JSON.parse(kind0[0].content) as Record; + // NIP-19 / common: lud16 is the Lightning address (user@domain). Fallbacks for other clients. + for (const key of ["lud16", "lightning", "ln_address", "nip05"] as const) { + const v = meta[key]; + if (typeof v === "string") { + const s = v.trim(); + if (lightningAddressRe.test(s)) { + lightning_address = s; + break; + } + } + } + if (typeof meta.name === "string" && meta.name.trim()) name = meta.name.trim(); + else if (typeof meta.display_name === "string" && meta.display_name.trim()) name = meta.display_name.trim(); + } catch (_) {} + } + + const nostrFirstSeenAt = earliestCreatedAt; + const lastMetadataFetchAt = Math.floor(Date.now() / 1000); + + await db.upsertUser({ + pubkey, + nostr_first_seen_at: nostrFirstSeenAt, + notes_count: notesInLookback, + followers_count: 0, + following_count: followingCount, + activity_score: score, + last_metadata_fetch_at: lastMetadataFetchAt, + lightning_address, + name, + }); + + return { + nostrFirstSeenAt, + notesCount: notesInLookback, + followingCount, + followersCount: 0, + activityScore: score, + }; +} diff --git a/backend/src/services/quote.ts b/backend/src/services/quote.ts new file mode 100644 index 0000000..5b46068 --- /dev/null +++ b/backend/src/services/quote.ts @@ -0,0 +1,69 @@ +import { randomInt } from "crypto"; +import { v4 as uuidv4 } from "uuid"; +import { config } from "../config.js"; +import { getDb } from "../db/index.js"; +import { getWalletBalanceSats } from "./lnbits.js"; + +const QUOTE_TTL_SECONDS = 60; + +interface PayoutBucket { + sats: number; + weight: number; +} + +function getPayoutBuckets(): PayoutBucket[] { + return [ + { sats: config.payoutSmallSats, weight: config.payoutWeightSmall }, + { sats: config.payoutMediumSats, weight: config.payoutWeightMedium }, + { sats: config.payoutLargeSats, weight: config.payoutWeightLarge }, + { sats: config.payoutJackpotSats, weight: config.payoutWeightJackpot }, + ]; +} + +/** + * Weighted random selection. Returns sats amount. + */ +export function selectWeightedPayout(): number { + const buckets = getPayoutBuckets(); + const totalWeight = buckets.reduce((s, b) => s + b.weight, 0); + let r = randomInt(0, totalWeight); + for (const b of buckets) { + if (r < b.weight) return b.sats; + r -= b.weight; + } + return config.payoutSmallSats; +} + +/** + * Compute payout for this claim: weighted selection, capped by daily budget remaining. + */ +export function computePayoutForClaim(todayPaidSats: number): number { + const remaining = Math.max(0, config.dailyBudgetSats - todayPaidSats); + if (remaining < config.faucetMinSats) return 0; + const selected = selectWeightedPayout(); + return Math.min(selected, remaining, config.faucetMaxSats); +} + +export interface CreateQuoteResult { + quoteId: string; + payoutSats: number; + expiresAt: number; +} + +export async function createQuote(pubkey: string, lightningAddress: string): Promise { + const db = getDb(); + const now = Math.floor(Date.now() / 1000); + const dayStart = now - (now % 86400); + const todayPaid = await db.getPaidSatsSince(dayStart); + let payout = computePayoutForClaim(todayPaid); + if (payout <= 0) return null; + + const walletBalance = await getWalletBalanceSats(); + payout = Math.min(payout, Math.max(0, walletBalance)); + if (payout < config.faucetMinSats) return null; + + const quoteId = uuidv4(); + const expiresAt = now + QUOTE_TTL_SECONDS; + await db.createQuote(quoteId, pubkey, payout, lightningAddress, expiresAt); + return { quoteId, payoutSats: payout, expiresAt }; +} diff --git a/backend/src/services/syncLnbitsDeposits.ts b/backend/src/services/syncLnbitsDeposits.ts new file mode 100644 index 0000000..95367e8 --- /dev/null +++ b/backend/src/services/syncLnbitsDeposits.ts @@ -0,0 +1,44 @@ +import { getDb } from "../db/index.js"; +import { getIncomingPaymentsFromLnbits } from "./lnbits.js"; + +const SYNC_INTERVAL_MS = 2 * 60 * 1000; + +const MIN_VALID_UNIX = 1e9; + +export async function syncLnbitsDeposits(): Promise { + const db = getDb(); + try { + const payments = await getIncomingPaymentsFromLnbits(100); + let added = 0; + let updated = 0; + for (const p of payments) { + const exists = await db.hasDepositWithPaymentHash(p.payment_hash); + if (!exists) { + await db.insertDeposit( + p.amount_sats, + "lightning", + p.payment_hash, + p.paid_at + ); + added++; + } else if (p.paid_at >= MIN_VALID_UNIX) { + const didUpdate = await db.updateDepositCreatedAtIfMissing(p.payment_hash, p.paid_at); + if (didUpdate) updated++; + } + } + if (added > 0) { + console.log(`[sync] LNbits deposits: ${added} new incoming payment(s) synced`); + } + if (updated > 0) { + console.log(`[sync] LNbits deposits: ${updated} date(s) backfilled`); + } + } catch (e) { + const msg = e instanceof Error ? e.message : String(e); + console.error("[sync] LNbits deposits failed:", msg); + } +} + +export function startLnbitsDepositSync(): void { + syncLnbitsDeposits(); + setInterval(syncLnbitsDeposits, SYNC_INTERVAL_MS); +} diff --git a/backend/tsconfig.json b/backend/tsconfig.json new file mode 100644 index 0000000..7bad8a4 --- /dev/null +++ b/backend/tsconfig.json @@ -0,0 +1,17 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "declaration": true, + "declarationMap": true, + "sourceMap": true + }, + "include": ["src/**/*"], + "exclude": ["node_modules", "dist"] +} diff --git a/context/Frontend_overview.md b/context/Frontend_overview.md new file mode 100644 index 0000000..65cb67b --- /dev/null +++ b/context/Frontend_overview.md @@ -0,0 +1,267 @@ +# frontend_overview.md + +## 1. Purpose + +This document defines the complete frontend architecture, user experience, and interaction model for the Sats Faucet application. + +The frontend must: + +* Provide a simple, clean, and trustworthy interface. +* Integrate Nostr login (NIP-07 or external signer). +* Guide users through eligibility check and claim confirmation. +* Display transparent faucet statistics and funding information. +* Clearly communicate rules, cooldowns, and denial reasons. + +The frontend must never expose secrets or LNbits keys. + +--- + +## 2. Tech Stack Requirements + +Recommended: + +* Framework: React (Next.js preferred) or similar SPA framework +* Styling: TailwindCSS or clean minimal CSS system +* QR generation library for Lightning deposit QR +* Nostr integration via NIP-07 browser extension (window.nostr) + +Frontend must be deployable as static site or server-rendered app. + +--- + +## 3. Global App Structure + +### 3.1 Pages + +1. Home Page (/) +2. Claim Modal or Claim Section +3. Transparency / Stats Section +4. Deposit Section +5. Optional: About / Rules page + +Navigation should be minimal and focused. + +--- + +## 4. Nostr Authentication + +### 4.1 Connect Flow + +* User clicks "Connect Nostr". +* Frontend requests pubkey via NIP-07. +* Pubkey stored in memory (not localStorage unless necessary). +* Show truncated pubkey (npub format preferred). + +### 4.2 NIP-98 Signing + +For protected API calls: + +* Build request payload (method + URL + timestamp + nonce). +* Request signature via NIP-07. +* Attach NIP-98 header to backend request. + +Frontend must: + +* Generate secure nonce. +* Handle signature errors gracefully. + +--- + +## 5. Home Page Layout + +### 5.1 Hero Section + +* Title: Sats Faucet +* Short description of rules +* Claim button + +### 5.2 Live Stats Section + +Display: + +* Current pool balance +* Total sats paid +* Total claims +* Claims in last 24h +* Daily budget progress bar + +Stats pulled from GET /stats. + +Must auto-refresh every 30–60 seconds. + +--- + +## 6. Claim Flow UI + +### 6.1 Step 1: Connect + +If not connected: + +* Disable claim button. +* Prompt user to connect Nostr. + +### 6.2 Step 2: Enter Lightning Address + +Input field: + +* Validate basic format (user@domain). +* Do not over-validate client-side. + +### 6.3 Step 3: Quote + +On "Check Eligibility": + +* Send POST /claim/quote with NIP-98. + +Possible responses: + +Eligible: + +* Show payout amount. +* Show Confirm button. + +Not eligible: + +* Show clear message from backend. +* If cooldown, show next eligible date. +* If account too new, show required age. + +### 6.4 Step 4: Confirm + +On confirm: + +* Call POST /claim/confirm. +* Show loading state. +* On success: + + * Show payout amount. + * Show next eligible time. +* On failure: + + * Show clear error. + +Must prevent double-click submission. + +--- + +## 7. Deposit Section + +Display: + +* Lightning Address (copyable). +* QR code of LNURL. +* Optional: "Create invoice" button. + +Copy buttons required for: + +* Lightning address +* LNURL + +Deposit section must feel transparent and trustworthy. + +--- + +## 8. Transparency Section + +Display: + +* Recent payouts (anonymized pubkey prefix). +* Payout amount. +* Timestamp. + +Optional: + +* Distribution breakdown (small/medium/large payouts). + +--- + +## 9. Error Handling UX + +Frontend must handle: + +* Network failures. +* Signature rejection. +* Expired quote. +* Payout failure. + +All errors must be displayed in a clean alert component. + +Do not expose internal error stack traces. + +--- + +## 10. State Management + +Minimal state required: + +* pubkey +* lightning_address +* eligibility result +* quote_id +* payout_sats +* next_eligible_at + +Use React state or lightweight state manager. + +No need for complex global store. + +--- + +## 11. Security Requirements + +Frontend must: + +* Never store secrets. +* Never expose LNbits keys. +* Never trust client-side eligibility logic. +* Rely entirely on backend for final validation. + +If Turnstile or CAPTCHA enabled: + +* Include widget only when backend indicates required. + +--- + +## 12. Design Principles + +* Minimal, modern UI. +* Clear visual feedback. +* No clutter. +* Show transparency clearly. +* Make it feel fair and legitimate. + +Recommended style: + +* Dark mode default. +* Bitcoin-inspired accent color. +* Clean typography. + +--- + +## 13. Performance Requirements + +* Fast initial load. +* Avoid blocking Nostr relay calls on frontend. +* All relay interaction handled by backend. + +--- + +## 14. Accessibility + +* Buttons must have disabled states. +* Inputs labeled clearly. +* QR accessible with copy option. + +--- + +## 15. Completion Criteria + +Frontend is complete when: + +* User can connect via NIP-07. +* Eligibility check works and displays correct messages. +* Confirm claim triggers payout. +* Deposit Lightning address and QR visible. +* Live stats update correctly. +* Cooldown and denial reasons clearly displayed. +* No sensitive data exposed in frontend code. diff --git a/context/backend_overview.md b/context/backend_overview.md new file mode 100644 index 0000000..82457cb --- /dev/null +++ b/context/backend_overview.md @@ -0,0 +1,359 @@ +# backend_overview.md + +## 1. Purpose + +This document defines the complete backend architecture and behavior for the Sats Faucet application. + +The backend is responsible for: + +* Verifying NIP-98 signed authentication. +* Enforcing all eligibility rules. +* Fetching and caching Nostr account data. +* Enforcing cooldowns and anti-abuse constraints. +* Generating and locking entropy payout quotes. +* Executing Lightning payouts via LNbits. +* Maintaining transparency statistics. +* Providing operational safety controls. + +This backend must be production-safe, abuse-resistant, and configurable entirely via environment variables. + +--- + +## 2. Tech Stack Requirements + +Recommended stack: + +* Language: Go, TypeScript (Node/Express), or Python (FastAPI) +* Database: PostgreSQL +* Optional: Redis (rate limiting + nonce replay protection) +* LNbits for Lightning payments +* Reverse proxy with TLS (nginx or Caddy) + +The backend must be stateless except for database persistence. + +--- + +## 3. Environment Variables + +All logic must be driven via .env configuration. + +Key categories: + +### 3.1 Security + +* JWT_SECRET +* HMAC_IP_SECRET +* NIP98_MAX_SKEW_SECONDS +* NONCE_TTL_SECONDS +* TRUST_PROXY +* ALLOWED_ORIGINS + +### 3.2 Faucet Economics + +* FAUCET_ENABLED +* EMERGENCY_STOP +* FAUCET_MIN_SATS +* FAUCET_MAX_SATS +* PAYOUT_WEIGHT_SMALL +* PAYOUT_WEIGHT_MEDIUM +* PAYOUT_WEIGHT_LARGE +* PAYOUT_WEIGHT_JACKPOT +* PAYOUT_SMALL_SATS +* PAYOUT_MEDIUM_SATS +* PAYOUT_LARGE_SATS +* PAYOUT_JACKPOT_SATS +* DAILY_BUDGET_SATS +* MAX_CLAIMS_PER_DAY +* MIN_WALLET_BALANCE_SATS + +### 3.3 Eligibility + +* MIN_ACCOUNT_AGE_DAYS +* MIN_ACTIVITY_SCORE +* MIN_NOTES_COUNT +* MIN_FOLLOWING_COUNT +* MIN_FOLLOWERS_COUNT +* ACTIVITY_LOOKBACK_DAYS + +### 3.4 Cooldowns + +* COOLDOWN_DAYS +* IP_COOLDOWN_DAYS +* MAX_CLAIMS_PER_IP_PER_PERIOD + +### 3.5 Nostr + +* NOSTR_RELAYS +* RELAY_TIMEOUT_MS +* MAX_EVENTS_FETCH +* METADATA_CACHE_HOURS + +### 3.6 LNbits + +* LNBITS_BASE_URL +* LNBITS_ADMIN_KEY +* LNBITS_WALLET_ID +* DEPOSIT_LIGHTNING_ADDRESS +* DEPOSIT_LNURLP + +--- + +## 4. Database Schema + +### 4.1 users + +* pubkey (PK) +* nostr_first_seen_at +* notes_count +* followers_count +* following_count +* activity_score +* last_metadata_fetch_at +* created_at +* updated_at + +### 4.2 claims + +* id (PK) +* pubkey (FK users.pubkey) +* claimed_at +* payout_sats +* ip_hash +* payout_destination_hash +* status (pending, paid, failed) +* lnbits_payment_hash +* error_message + +### 4.3 ip_limits + +* ip_hash (PK) +* last_claimed_at +* claim_count_period + +### 4.4 quotes + +* quote_id (PK) +* pubkey +* payout_sats +* created_at +* expires_at +* status (active, consumed, expired) + +### 4.5 daily_stats (optional) + +* date (PK) +* total_paid_sats +* total_claims +* unique_pubkeys + +All IP addresses must be stored as HMAC(IP, HMAC_IP_SECRET). + +--- + +## 5. NIP-98 Authentication + +Every protected endpoint must: + +1. Extract NIP-98 header or payload. +2. Verify signature against pubkey. +3. Verify HTTP method and URL match signed payload. +4. Verify timestamp within allowed skew. +5. Verify nonce not previously used. +6. Reject if invalid. + +Nonces must be stored in Redis or DB for NONCE_TTL_SECONDS. + +--- + +## 6. IP Resolution + +If TRUST_PROXY=true: + +* Read first valid IP from X-Forwarded-For. + Else: +* Use request remote address. + +Then: + +* Hash IP using HMAC_IP_SECRET. +* Never store raw IP. + +--- + +## 7. Eligibility Engine + +Eligibility flow: + +1. Check FAUCET_ENABLED. +2. Check EMERGENCY_STOP. +3. Check LNbits wallet balance >= MIN_WALLET_BALANCE_SATS. +4. Check pubkey cooldown. +5. Check IP cooldown. +6. Fetch or load cached Nostr profile. +7. Compute account age. +8. Compute activity score. +9. Compare with thresholds. + +Return structured result with denial code if failed. + +--- + +## 8. Nostr Data Fetching + +For a given pubkey: + +1. Query relays in parallel. +2. Fetch: + + * kind 0 (metadata) + * kind 1 (notes) + * kind 3 (contacts) +3. Compute: + + * earliest created_at + * notes count in ACTIVITY_LOOKBACK_DAYS + * following count + +Cache results for METADATA_CACHE_HOURS. + +If no events found: + +* Deny as account_too_new. + +--- + +## 9. Activity Scoring + +Example scoring logic: + +* Has metadata: +10 +* Notes >= MIN_NOTES_COUNT: +20 +* Following >= MIN_FOLLOWING_COUNT: +10 +* Followers >= MIN_FOLLOWERS_COUNT: +10 + +Score must be deterministic and logged. + +--- + +## 10. Entropy Payout System + +Weighted random selection: + +1. Build array based on configured weights. +2. Generate secure random number. +3. Select payout bucket. + +Before finalizing quote: + +* Check daily spend. +* Check MAX_CLAIMS_PER_DAY. + +If budget exceeded: + +* Either deny or downgrade payout to FAUCET_MIN_SATS. + +--- + +## 11. Claim Flow + +### 11.1 POST /claim/quote + +Input: + +* lightning_address + +Steps: + +* Run eligibility engine. +* If eligible, generate payout. +* Insert quote record with expiry (e.g., 60 seconds). +* Return quote_id and payout_sats. + +### 11.2 POST /claim/confirm + +Input: + +* quote_id + +Steps: + +* Verify quote exists and active. +* Re-check cooldown and budget. +* Execute LNbits payment. +* Update claim record. +* Mark quote consumed. + +Must be idempotent. + +--- + +## 12. LNbits Integration + +Payout flow: + +1. Resolve Lightning address to LNURL. +2. Fetch LNURL payRequest. +3. Call callback with amount in millisats. +4. Handle success/failure response. +5. Store payment hash. + +On failure: + +* Mark claim failed. +* Do not lock cooldown unless configured. + +--- + +## 13. Public Endpoints + +GET /health +GET /config +GET /stats +GET /deposit + +No authentication required. + +--- + +## 14. Logging and Monitoring + +Each claim attempt must log: + +* pubkey +* ip_hash +* eligibility result +* payout amount +* payment status + +Metrics to track: + +* denial reasons count +* payout distribution +* daily spend + +--- + +## 15. Security Hard Requirements + +* Strict CORS +* Rate limit /claim endpoints +* Nonce replay protection +* HMAC IP hashing +* Admin keys never exposed +* All secrets loaded from env + +--- + +## 16. Production Readiness Checklist + +Backend is complete when: + +* NIP-98 auth fully verified. +* Pubkey and IP cooldown enforced. +* Account age check enforced. +* Activity score enforced. +* Entropy payout cannot be rerolled. +* Daily budget cannot be exceeded. +* LNbits payout works and errors handled safely. +* Emergency stop disables claims instantly. +* Logs clearly show denial reasons. diff --git a/context/overview.md b/context/overview.md new file mode 100644 index 0000000..ca5c105 --- /dev/null +++ b/context/overview.md @@ -0,0 +1,386 @@ +# Sats Faucet App + +## 1. Purpose + +Build a sats faucet web app that lets Nostr users claim a small, randomized sats payout (entropy payout) on a cooldown schedule, with strong anti-abuse protections. + +Key goals: + +* Fun community experiment that can evolve into a long-term public faucet. +* Simple UX: connect Nostr, enter Lightning address, claim. +* Abuse-resistant: NIP-98 signed requests, account age checks, activity scoring, per-pubkey cooldown, per-IP cooldown, and budget guards. +* Transparent: public stats and recent payouts (anonymized). +* Sustainable: daily budget cap, emergency stop switch, and minimum wallet balance guard. + +Non-goals: + +* Perfect Sybil resistance. The system raises the cost of abuse rather than claiming to fully prevent it. + +## 2. Core Requirements + +### 2.1 Claim rules + +A user may claim only if all conditions are true: + +* Authenticated via Nostr using NIP-98 signature on the claim request. +* Account age is at least MIN_ACCOUNT_AGE_DAYS (default 14 days), based on earliest observed event timestamp on configured relays. +* Activity score meets or exceeds MIN_ACTIVITY_SCORE. +* Pubkey has not successfully claimed within the last COOLDOWN_DAYS (default 7 days). +* IP has not successfully claimed within the last IP_COOLDOWN_DAYS (default 7 days) and under MAX_CLAIMS_PER_IP_PER_PERIOD. +* Faucet is enabled and not in emergency stop. +* LNbits wallet balance is at or above MIN_WALLET_BALANCE_SATS. +* Daily budget not exceeded. + +### 2.2 Payout + +* Payout uses weighted randomness (entropy) configured by environment variables. +* Reward amount is fixed per bucket (example buckets: 10, 25, 50, 100 sats), selected by weight. +* The payout selected for a claim is locked to a short-lived quote to prevent re-rolling by refreshing. +* Payout is sent via LNbits to a Lightning address provided by the user. + +### 2.3 Deposits + +* The app must display a deposit Lightning address and QR for community funding. +* Preferred: LNURLp/Lightning Address for deposits (static address and QR). +* Optional: allow users to create an invoice for a chosen deposit amount. + +### 2.4 Transparency + +Publicly visible: + +* Current faucet pool balance (from LNbits). +* Total sats paid. +* Total claim count. +* Claims in last 24h. +* Daily budget and daily spend. +* Recent claims list (anonymized, limited number). + +## 3. System Overview + +### 3.1 Components + +1. Frontend Web App + + * Connect Nostr (NIP-07 or external signer). + * Collect Lightning address. + * Calls backend to get a quote and confirm claim. + * Shows eligibility failures with friendly reasons and next eligible time. + * Shows deposit info and public transparency stats. + +2. Faucet Backend API + + * Validates NIP-98 signed requests. + * Resolves client IP safely (with proxy support). + * Enforces cooldown locks and rate limiting. + * Fetches Nostr metadata + activity from relays and caches it. + * Computes account age and activity score. + * Computes payout quote, enforces daily budget, executes LNbits payout. + * Records claims, payout results, and stats. + +3. LNbits + + * Holds the faucet wallet. + * Executes outgoing payments. + * Provides deposit address (Lightning Address/LNURLp). + +### 3.2 Trust boundaries + +* LNbits keys live only on the backend. +* Frontend never sees LNbits keys. +* Backend stores only HMAC-hashed IPs, not raw IPs. +* Lightning address should not be stored in plaintext unless explicitly desired; store a hash for privacy. + +## 4. User Experience + +### 4.1 Home page + +* Primary call-to-action: Claim sats. +* Deposit section: + + * Show DEPOSIT_LIGHTNING_ADDRESS. + * Show QR code for DEPOSIT_LNURLP (or encoded LNURL). + * Optional button: Create deposit invoice. +* Live stats: + + * Balance, total paid, total claims, last 24h. + * Recent payouts list. +* Rules summary: + + * Cooldown days, min age, min score, per-IP limit. + +### 4.2 Claim flow + +1. User clicks Connect Nostr. +2. User enters Lightning address. +3. User clicks Check / Quote. +4. App shows: + + * If ineligible: exact reason and next eligible time. + * If eligible: payout amount and Confirm button. +5. User confirms. +6. App shows success state: + + * payout amount + * status + * next eligible date + +UI must clearly separate: + +* Eligibility check +* Payment attempt + +## 5. Backend Behavior + +### 5.1 NIP-98 authentication + +The backend must verify each protected request: + +* Signature is valid for the provided pubkey. +* Signed payload includes correct method and URL. +* Timestamp is within NIP98_MAX_SKEW_SECONDS. +* Nonce is present and not reused (store for NONCE_TTL_SECONDS). + +### 5.2 IP handling + +* Backend must support TRUST_PROXY mode. +* When TRUST_PROXY=true, derive IP from X-Forwarded-For correctly. +* Hash IP using HMAC_IP_SECRET and store only the hash. + +### 5.3 Eligibility engine + +For a given pubkey and ip_hash: + +* Check emergency stop and faucet enabled flags. +* Check wallet balance guard. +* Check per-pubkey cooldown: latest successful claim timestamp. +* Check per-IP cooldown: latest successful claim timestamp and quota. +* Fetch or load cached Nostr profile and activity metrics. +* Verify account age and activity score. + +Return structured result: + +* eligible: boolean +* denial_reason: enum +* denial_message: user-friendly text +* next_eligible_at: timestamp if applicable + +### 5.4 Quote then confirm + +Use a two-step claim to prevent payout rerolling. + +POST /claim/quote + +* Auth required (NIP-98) +* Input: lightning_address +* Performs full eligibility check. +* Selects payout using weighted randomness. +* Enforces daily budget guard: + + * If today_spent + payout > DAILY_BUDGET_SATS, either deny or reduce to FAUCET_MIN_SATS based on config. +* Creates a short-lived quote record (quote_id, pubkey, payout_sats, expires_at). +* Response includes payout_sats and quote_id. + +POST /claim/confirm + +* Auth required (NIP-98) +* Input: quote_id +* Re-check critical guards (pubkey lock, ip lock, budget, balance, quote expiry). +* Executes LNbits payment. +* Records claim row with status. +* Returns success/failure payload. + +Notes: + +* Confirm must be idempotent: multiple confirms for same quote_id should not pay twice. +* If confirm is called after quote expiry, return a clean error. + +### 5.5 LNbits payout + +Backend sends payment to the user’s Lightning address. + +Must handle: + +* Lightning address validation (basic format and domain resolve). +* LNURLp resolution: fetch payRequest, then call callback with amount. +* Handle failures: + + * Mark claim as failed, store error. + * Do not consume cooldown if payout did not actually send (configurable, but recommended). + +Retries: + +* For MVP, 0 retries. +* For long-term, add a background worker to retry transient failures. + +## 6. Nostr data sourcing + +### 6.1 Relay list + +Backend reads NOSTR_RELAYS from env. + +Must query multiple relays in parallel. + +### 6.2 Account age + +Compute nostr_first_seen_at as earliest observed event timestamp for the pubkey. + +Practical strategy: + +* Query kinds: 0, 1, 3. +* Use earliest created_at found. +* Cache result. + +If no events found: + +* Treat as new or unknown and deny with a friendly message. + +### 6.3 Activity score + +Compute a simple score (0 to 100) using cached metrics. + +Suggested inputs: + +* Has kind 0 metadata. +* Notes count in last ACTIVITY_LOOKBACK_DAYS. +* Following count. +* Followers count (optional if expensive). +* Optional zap receipts. + +The scoring formula must be controlled via env thresholds so it can be tuned as the faucet grows. + +## 7. Persistence and Storage + +### 7.1 Database + +Use Postgres. + +Required tables: + +* users: pubkey, nostr_first_seen_at, cached metrics, last fetch timestamps. +* claims: pubkey, claimed_at, payout, ip_hash, status, lnbits identifiers, errors. +* ip_limits: ip_hash, last_claimed_at, rolling counters. +* quotes: quote_id, pubkey, payout_sats, expires_at, status. +* stats_daily (optional): daily totals. + +### 7.2 Privacy + +* Store ip_hash only (HMAC). +* Store payout destination as hash. +* Never log raw Lightning address in plaintext logs. + +## 8. Observability + +Logging must include: + +* Request id +* pubkey +* eligibility denial reason +* payout amount (if eligible) +* LNbits payment result (success/failure) + +Metrics dashboard (optional): + +* total claims +* total paid +* denial counts by reason +* payout distribution + +## 9. Operational Controls + +Environment variables must support: + +* FAUCET_ENABLED +* EMERGENCY_STOP +* DAILY_BUDGET_SATS +* MAX_CLAIMS_PER_DAY +* MIN_WALLET_BALANCE_SATS + +Behavior: + +* If EMERGENCY_STOP=true, deny all claims with a maintenance message. +* If wallet balance below MIN_WALLET_BALANCE_SATS, deny claims and encourage deposits. + +## 10. API Surface + +Public endpoints + +* GET /health +* GET /config +* GET /stats +* GET /deposit + +Claim endpoints (auth: NIP-98) + +* POST /claim/quote +* POST /claim/confirm + +Optional admin endpoints (later) + +* GET /admin/claims +* GET /admin/users +* POST /admin/ban +* POST /admin/allow + +## 11. Error Handling + +All errors must return: + +* code (stable string) +* message (user-friendly) +* details (optional for debugging) + +Common denial codes: + +* faucet_disabled +* emergency_stop +* insufficient_balance +* daily_budget_exceeded +* cooldown_pubkey +* cooldown_ip +* account_too_new +* low_activity +* invalid_nip98 +* invalid_lightning_address +* quote_expired +* payout_failed + +## 12. Security Checklist + +Minimum required: + +* Strict NIP-98 verification (method, url, timestamp, nonce). +* Nonce replay prevention. +* IP hashing. +* Cloudflare or similar rate limiting on claim endpoints. +* CORS restricted to FRONTEND_URL. +* No secret keys in frontend. + +Nice to have: + +* Bot protection (Turnstile) behind a feature flag. +* VPN/proxy detection behind a feature flag. + +## 13. Deployment + +* Backend behind a reverse proxy with TLS. +* TRUST_PROXY=true when behind proxy. +* Use database migrations. + +Recommended: + +* Docker compose for backend + Postgres + optional Redis. +* Separate LNbits deployment. + +## 14. Acceptance Criteria + +A developer is done when: + +* A Nostr user can connect and claim sats successfully to a Lightning address. +* The faucet enforces cooldowns per pubkey and per IP. +* The faucet rejects accounts younger than 14 days. +* The faucet rejects accounts below activity threshold. +* Payouts are randomized and cannot be rerolled by refreshing. +* Public page shows deposit address and QR. +* Public stats show balance and transparency counters. +* Admin can stop the faucet instantly via env. +* No raw IPs or LNbits keys leak to the client. diff --git a/frontend/.env.example b/frontend/.env.example new file mode 100644 index 0000000..768805a --- /dev/null +++ b/frontend/.env.example @@ -0,0 +1,3 @@ +# Backend API URL (required in dev when frontend runs on different port) +# Leave empty if frontend is served from same origin as API +VITE_API_URL=http://localhost:3001 diff --git a/frontend/bitcoin-faucet_3.html b/frontend/bitcoin-faucet_3.html new file mode 100644 index 0000000..ecaeae1 --- /dev/null +++ b/frontend/bitcoin-faucet_3.html @@ -0,0 +1,374 @@ + + + + + + Free Bitcoins + + + + + +
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+ + + diff --git a/frontend/package-lock.json b/frontend/package-lock.json new file mode 100644 index 0000000..1cbcb4b --- /dev/null +++ b/frontend/package-lock.json @@ -0,0 +1,2297 @@ +{ + "name": "lnfaucet-frontend", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "lnfaucet-frontend", + "version": "1.0.0", + "dependencies": { + "canvas-confetti": "^1.9.4", + "framer-motion": "^11.11.17", + "nostr-tools": "^2.4.4", + "qrcode": "^1.5.4", + "react": "^18.3.1", + "react-dom": "^18.3.1", + "react-router-dom": "^7.13.1" + }, + "devDependencies": { + "@types/canvas-confetti": "^1.9.0", + "@types/react": "^18.3.12", + "@types/react-dom": "^18.3.1", + "@types/react-router-dom": "^5.3.3", + "@vitejs/plugin-react": "^4.3.3", + "typescript": "^5.6.3", + "vite": "^5.4.10" + } + }, + "node_modules/@babel/code-frame": { + "version": "7.29.0", + "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz", + "integrity": 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"@vitejs/plugin-react": "^4.3.3", + "typescript": "^5.6.3", + "vite": "^5.4.10" + } +} diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx new file mode 100644 index 0000000..23a7b4f --- /dev/null +++ b/frontend/src/App.tsx @@ -0,0 +1,101 @@ +import { useState, useEffect, useCallback } from "react"; +import { BrowserRouter, Routes, Route } from "react-router-dom"; +import { getToken, getAuthMe, clearToken } from "./api"; +import { Header } from "./components/Header"; +import { Footer } from "./components/Footer"; +import { ClaimWizard } from "./components/ClaimWizard"; +import { StatsSection } from "./components/StatsSection"; +import { DepositSection } from "./components/DepositSection"; +import { TransactionsPage } from "./pages/TransactionsPage"; + +const FaucetSvg = () => ( + + + + + + + + + + + + + +); + +export default function App() { + const [pubkey, setPubkey] = useState(null); + const [statsRefetchTrigger, setStatsRefetchTrigger] = useState(0); + + useEffect(() => { + const token = getToken(); + if (!token) return; + getAuthMe() + .then((r) => setPubkey(r.pubkey)) + .catch(() => { + clearToken(); + setPubkey(null); + }); + }, []); + + const handleClaimSuccess = useCallback(() => { + setStatsRefetchTrigger((t) => t + 1); + }, []); + + return ( + +
+
+
+
+ + + +
+
+ +

Sats Faucet

+
+ +
+ +
+ } + /> + +
+ +
+
+ } + /> + +
+