Add NFC support to TPOS Extension (#856)

* WIP

* styling

* WIP

* WIP

* WIP

* Clean up for PR

* isort

* hold abortContoller for a while longer

lnbits/extensions/tpos/views_api.py

@@ -1,7 +1,9 @@
 from http import HTTPStatus
 
+import httpx
 from fastapi import Query
 from fastapi.params import Depends
+from lnurl import decode as decode_lnurl
 from loguru import logger
 from starlette.exceptions import HTTPException
 
@@ -12,7 +14,7 @@ from lnbits.decorators import WalletTypeInfo, get_key_type, require_admin_key
 
 from . import tpos_ext
 from .crud import create_tpos, delete_tpos, get_tpos, get_tposs
-from .models import CreateTposData
+from .models import CreateTposData, PayLnurlWData
 
 
 @tpos_ext.get("/api/v1/tposs", status_code=HTTPStatus.OK)
@@ -79,6 +81,66 @@ async def api_tpos_create_invoice(
     return {"payment_hash": payment_hash, "payment_request": payment_request}
 
 
+@tpos_ext.post(
+    "/api/v1/tposs/{tpos_id}/invoices/{payment_request}/pay", status_code=HTTPStatus.OK
+)
+async def api_tpos_pay_invoice(
+    lnurl_data: PayLnurlWData, payment_request: str = None, tpos_id: str = None
+):
+    tpos = await get_tpos(tpos_id)
+
+    if not tpos:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND, detail="TPoS does not exist."
+        )
+
+    lnurl = (
+        lnurl_data.lnurl.replace("lnurlw://", "")
+        .replace("lightning://", "")
+        .replace("LIGHTNING://", "")
+        .replace("lightning:", "")
+        .replace("LIGHTNING:", "")
+    )
+
+    if lnurl.lower().startswith("lnurl"):
+        lnurl = decode_lnurl(lnurl)
+    else:
+        lnurl = "https://" + lnurl
+
+    async with httpx.AsyncClient() as client:
+        try:
+            r = await client.get(lnurl, follow_redirects=True)
+            if r.is_error:
+                lnurl_response = {"success": False, "detail": "Error loading"}
+            else:
+                resp = r.json()
+                if resp["tag"] != "withdrawRequest":
+                    lnurl_response = {"success": False, "detail": "Wrong tag type"}
+                else:
+                    r2 = await client.get(
+                        resp["callback"],
+                        follow_redirects=True,
+                        params={
+                            "k1": resp["k1"],
+                            "pr": payment_request,
+                        },
+                    )
+                    resp2 = r2.json()
+                    if r2.is_error:
+                        lnurl_response = {
+                            "success": False,
+                            "detail": "Error loading callback",
+                        }
+                    elif resp2["status"] == "ERROR":
+                        lnurl_response = {"success": False, "detail": resp2["reason"]}
+                    else:
+                        lnurl_response = {"success": True, "detail": resp2}
+        except (httpx.ConnectError, httpx.RequestError):
+            lnurl_response = {"success": False, "detail": "Unexpected error occurred"}
+
+    return lnurl_response
+
+
 @tpos_ext.get(
     "/api/v1/tposs/{tpos_id}/invoices/{payment_hash}", status_code=HTTPStatus.OK
 )