LNURL-auth support for LNDHub

backends/CLightningREST.ts

@@ -150,8 +150,10 @@ export default class CLightningREST extends LND {
         this.getRequest(
             `/v1/utility/checkMessage/${data.msg}/${data.signature}`
         );
+    lnurlAuth = (message: string) => this.signMessage(message);
 
     supportsMessageSigning = () => true;
+    supportsLnurlAuth = () => true;
     supportsOnchainSends = () => true;
     supportsOnchainReceiving = () => true;
     supportsKeysend = () => true;

backends/Eclair.ts

@@ -466,8 +466,10 @@ export default class Eclair {
             msg: Base64Utils.btoa(data.msg),
             sig: data.signature
         });
+    lnurlAuth = (message: string) => this.signMessage(message);
 
     supportsMessageSigning = () => true;
+    supportsLnurlAuth = () => true;
     supportsOnchainSends = () => true;
     supportsOnchainReceiving = () => true;
     supportsKeysend = () => false;

backends/LND.ts

@@ -336,10 +336,12 @@ export default class LND {
             msg: Base64Utils.btoa(data.msg),
             signature: data.signature
         });
+    lnurlAuth = (r_hash: string) => this.signMessage(r_hash);
     subscribeInvoice = (r_hash: string) =>
         this.getRequest(`/v2/invoices/subscribe/${r_hash}`);
 
     supportsMessageSigning = () => true;
+    supportsLnurlAuth = () => true;
     supportsOnchainSends = () => true;
     supportsOnchainReceiving = () => true;
     supportsKeysend = () => true;

backends/LightningNodeConnect.ts

@@ -271,6 +271,7 @@ export default class LightningNodeConnect {
                 signature: req.signature
             })
             .then((data: lnrpc.VerifyMessageResponse) => snakeize(data));
+    lnurlAuth = async (message: string) => await this.signMessage(message);
     subscribeInvoice = (r_hash: string) =>
         this.lnc.lnd.invoices.subscribeSingleInvoice({ r_hash });
     subscribeInvoices = () => this.lnc.lnd.lightning.subscribeInvoices();
@@ -285,6 +286,7 @@ export default class LightningNodeConnect {
     };
 
     supportsMessageSigning = () => true;
+    supportsLnurlAuth = () => true;
     supportsOnchainSends = () => true;
     supportsOnchainReceiving = () => true;
     supportsKeysend = () => true;

backends/LndHub.ts

@@ -74,8 +74,13 @@ export default class LndHub extends LND {
             invoice: data.payment_request,
             amount: Number(data.amt && data.amt * 1000)
         });
+    lnurlAuth = () =>
+        Promise.resolve({
+            signature: `lndhub://${stores.settingsStore.username}:${stores.settingsStore.password}`
+        });
 
     supportsMessageSigning = () => false;
+    supportsLnurlAuth = () => true;
     supportsOnchainSends = () => false;
     supportsOnchainReceiving = () =>
         !(

backends/Spark.ts

@@ -311,6 +311,7 @@ export default class Spark {
     };
 
     supportsMessageSigning = () => false;
+    supportsLnurlAuth = () => false;
     supportsOnchainSends = () => true;
     supportsOnchainReceiving = () => true;
     supportsKeysend = () => false;

utils/BackendUtils.ts

@@ -88,6 +88,7 @@ class BackendUtils {
     importAccount = (...args: any[]) => this.call('importAccount', args);
     signMessage = (...args: any[]) => this.call('signMessage', args);
     verifyMessage = (...args: any[]) => this.call('verifyMessage', args);
+    lnurlAuth = (...args: any[]) => this.call('lnurlAuth', args);
 
     fundPsbt = (...args: any[]) => this.call('fundPsbt', args);
     finalizePsbt = (...args: any[]) => this.call('finalizePsbt', args);
@@ -104,6 +105,7 @@ class BackendUtils {
     login = (...args: any[]) => this.call('login', args);
 
     supportsMessageSigning = () => this.call('supportsMessageSigning');
+    supportsLnurlAuth = () => this.call('supportsLnurlAuth');
     supportsOnchainSends = () => this.call('supportsOnchainSends');
     supportsOnchainReceiving = () => this.call('supportsOnchainReceiving');
     supportsKeysend = () => this.call('supportsKeysend');

utils/handleAnything.ts

@@ -286,7 +286,7 @@ const handleAnything = async (
                     ];
                     break;
                 case 'login':
-                    if (BackendUtils.supportsMessageSigning()) {
+                    if (BackendUtils.supportsLnurlAuth()) {
                         if (isClipboardValue) return true;
                         return [
                             'LnurlAuth',

views/LnurlAuth.tsx

@@ -96,7 +96,7 @@ export default class LnurlAuth extends React.Component<
 
         const body = LNURLAUTH_CANONICAL_PHRASE;
 
-        BackendUtils.signMessage(body)
+        BackendUtils.lnurlAuth(body)
             .then((signature: any) => {
                 // got the signed message, now build linkingkey
 
@@ -252,7 +252,8 @@ export default class LnurlAuth extends React.Component<
                             padding: 20,
                             fontSize: 22,
                             color: themeColor('text'),
-                            fontFamily: 'Lato-Bold'
+                            fontFamily: 'Lato-Bold',
+                            textAlign: 'center'
                         }}
                     >
                         {domain}