electrum server select

lnbits/static/i18n/en.js

@@ -849,9 +849,11 @@ window.localisation.en = {
   blockexplorer_public_api: 'Public API Access',
   blockexplorer_public_api_desc:
     'Allow unauthenticated access to the block explorer API endpoints.',
+  electrum_compatible_server: 'Electrum compatible server',
   electrum_server_url: 'Electrum Server URL',
-  electrum_server_url_hint:
-    'e.g. ssl://electrum.blockstream.info:50002 or tcp://localhost:50001',
+  electrum_server_url_hint: 'Choose a public Electrum server or enter your own.',
+  electrum_server_url_custom: 'Custom Electrum Server URL',
+  view_public_electrum_servers: 'View public Electrum servers',
   blockexplorer_network: 'Bitcoin Network',
   blockexplorer_network_hint:
     'The network the Electrum server is connected to, used to render addresses correctly.',

lnbits/static/js/components/admin/lnbits-admin-blockexplorer.js

@@ -1,4 +1,40 @@
 window.app.component('lnbits-admin-blockexplorer', {
   props: ['form-data'],
-  template: '#lnbits-admin-blockexplorer'
+  template: '#lnbits-admin-blockexplorer',
+  data() {
+    return {
+      electrumServers: [
+        'ssl://fulcrum.lnbits.com:443',
+        'ssl://mainnet.nunchuk.io:52002',
+        'ssl://fulcrum.grey.pw:50002',
+        'ssl://electrum2.bluewallet.io:443',
+        'ssl://electrum.acinq.co:50002',
+        'ssl://electrum.blockstream.info:50002',
+        'ssl://bitcoin.mullvad.net:5010'
+      ]
+    }
+  },
+  computed: {
+    electrumServerOptions() {
+      return [...this.electrumServers, 'Custom']
+    },
+    electrumServerPreset: {
+      get() {
+        return this.electrumServers.includes(
+          this.formData.lnbits_blockexplorer_electrum_url
+        )
+          ? this.formData.lnbits_blockexplorer_electrum_url
+          : 'Custom'
+      },
+      set(value) {
+        if (value === 'Custom') {
+          if (this.electrumServerPreset !== 'Custom') {
+            this.formData.lnbits_blockexplorer_electrum_url = ''
+          }
+          return
+        }
+        this.formData.lnbits_blockexplorer_electrum_url = value
+      }
+    }
+  }
 })

lnbits/templates/components/admin/blockexplorer.vue

@@ -46,12 +46,24 @@
       </div>
     </div>
     <q-separator class="q-mb-lg q-mt-sm"></q-separator>
+    <h6 class="q-my-none q-mb-sm">
+      <span v-text="$t('electrum_compatible_server')"></span>
+    </h6>
     <div class="row q-col-gutter-md">
-      <div class="col-12 col-md-8">
+      <div class="col-12 col-md-4">
+        <q-select
+          filled
+          v-model="electrumServerPreset"
+          :options="electrumServerOptions"
+          :label="$t('electrum_server_url')"
+          :hint="$t('electrum_server_url_hint')"
+        ></q-select>
+      </div>
+      <div class="col-12 col-md-4" v-if="electrumServerPreset === 'Custom'">
         <q-input
           filled
           v-model="formData.lnbits_blockexplorer_electrum_url"
-          :label="$t('electrum_server_url')"
+          :label="$t('electrum_server_url_custom')"
           :hint="$t('electrum_server_url_hint')"
         ></q-input>
       </div>
@@ -64,6 +76,15 @@
           :hint="$t('blockexplorer_network_hint')"
         ></q-select>
       </div>
+      <div class="col-12">
+        <a
+          href="https://1209k.com/bitcoin-eye/ele.php?chain=btc"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          <span v-text="$t('view_public_electrum_servers')"></span>
+        </a>
+      </div>
     </div>
   </q-card-section>
 </template>

lnbits/utils/electrum.py

@@ -763,7 +763,18 @@ class AddressTracker:
         for scripthash, address in list(subscribed.items()):
             if address not in still_wanted:
                 del subscribed[scripthash]
-                await client.unsubscribe_scripthash(scripthash)
+                try:
+                    await client.unsubscribe_scripthash(scripthash)
+                except ElectrumError:
+                    # blockchain.scripthash.unsubscribe is part of the spec but
+                    # many ElectrumX deployments don't implement it, returning
+                    # "unknown method". This is expected and harmless: we've
+                    # already dropped the scripthash from `subscribed` above,
+                    # so if the server keeps pushing notifications for it
+                    # anyway, on_status_change() looks it up, finds nothing,
+                    # and drops them. Not logged since it fires on every
+                    # untrack against these servers.
+                    pass
 
     async def _wait_for_change_or_close(self, client: ElectrumClient) -> bool:
         """Waits until addresses change or the connection closes; returns True