ADD: lightning address send support (closes #3690)

class/deeplink-schema-match.js

@@ -153,6 +153,18 @@ class DeeplinkSchemaMatch {
           },
         },
       ]);
+    } else if (Lnurl.isLightningAddress(event.url)) {
+      // this might be not just an email but a lightning addres
+      // @see https://lightningaddress.com
+      completionHandler([
+        'ScanLndInvoiceRoot',
+        {
+          screen: 'ScanLndInvoice',
+          params: {
+            uri: event.url,
+          },
+        },
+      ]);
     } else if (DeeplinkSchemaMatch.isSafelloRedirect(event)) {
       const urlObject = url.parse(event.url, true); // eslint-disable-line node/no-deprecated-api
 

class/lnurl.js

@@ -28,7 +28,15 @@ export default class Lnurl {
 
   static getUrlFromLnurl(lnurlExample) {
     const found = Lnurl.findlnurl(lnurlExample);
-    if (!found) return false;
+    if (!found) {
+      if (Lnurl.isLightningAddress(lnurlExample)) {
+        const username = lnurlExample.split('@')[0].trim();
+        const host = lnurlExample.split('@')[1].trim();
+        return `https://${host}/.well-known/lnurlp/${username}`;
+      } else {
+        return false;
+      }
+    }
 
     const decoded = bech32.decode(found, 10000);
     return Buffer.from(bech32.fromWords(decoded.words)).toString();
@@ -256,4 +264,11 @@ export default class Lnurl {
   getCommentAllowed() {
     return this?._lnurlPayServicePayload?.commentAllowed ? parseInt(this._lnurlPayServicePayload.commentAllowed) : false;
   }
+
+  static isLightningAddress(address) {
+    // ensure only 1 `@` present:
+    if (address.split('@').length !== 2) return false;
+    const splitted = address.split('@');
+    return !!splitted[0].trim() && !!splitted[1].trim();
+  }
 }

screen/lnd/lnurlPay.js

@@ -56,11 +56,16 @@ const LnurlPay = () => {
   useEffect(() => {
     if (lnurl) {
       const ln = new Lnurl(lnurl, AsyncStorage);
-      ln.callLnurlPayService().then(setPayload);
+      ln.callLnurlPayService()
+        .then(setPayload)
+        .catch(error => {
+          alert(error.message);
+          pop();
+        });
       setLN(ln);
       setIsLoading(false);
     }
-  }, [lnurl]);
+  }, [lnurl, pop]);
 
   useEffect(() => {
     setPayButtonDisabled(isLoading);

screen/lnd/scanLndInvoice.js

@@ -92,6 +92,9 @@ const ScanLndInvoice = () => {
 
   useEffect(() => {
     if (wallet && uri) {
+      if (Lnurl.isLnurl(uri)) return processLnurlPay(uri);
+      if (Lnurl.isLightningAddress(uri)) return processLnurlPay(uri);
+
       let data = uri;
       // handling BIP21 w/BOLT11 support
       const ind = data.indexOf('lightning=');
@@ -102,9 +105,6 @@ const ScanLndInvoice = () => {
       data = data.replace('LIGHTNING:', '').replace('lightning:', '');
       console.log(data);
 
-      /**
-       * @type {LightningCustodianWallet}
-       */
       let decoded;
       try {
         decoded = wallet.decodeInvoice(data);
@@ -144,6 +144,7 @@ const ScanLndInvoice = () => {
 
   const processInvoice = data => {
     if (Lnurl.isLnurl(data)) return processLnurlPay(data);
+    if (Lnurl.isLightningAddress(data)) return processLnurlPay(data);
     setParams({ uri: data });
   };
 
@@ -216,7 +217,12 @@ const ScanLndInvoice = () => {
   };
 
   const processTextForInvoice = text => {
-    if (text.toLowerCase().startsWith('lnb') || text.toLowerCase().startsWith('lightning:lnb') || Lnurl.isLnurl(text)) {
+    if (
+      text.toLowerCase().startsWith('lnb') ||
+      text.toLowerCase().startsWith('lightning:lnb') ||
+      Lnurl.isLnurl(text) ||
+      Lnurl.isLightningAddress(text)
+    ) {
       processInvoice(text);
     } else {
       setDecoded(undefined);

tests/unit/deeplink-schema-match.test.js

@@ -202,6 +202,20 @@ describe('unit - DeepLinkSchemaMatch', function () {
           },
         ],
       },
+      {
+        argument: {
+          url: 'lnaddress@zbd.gg',
+        },
+        expected: [
+          'ScanLndInvoiceRoot',
+          {
+            screen: 'ScanLndInvoice',
+            params: {
+              uri: 'lnaddress@zbd.gg',
+            },
+          },
+        ],
+      },
       {
         argument: {
           url: require('fs').readFileSync('./tests/unit/fixtures/skeleton-cobo.txt', 'ascii'),

tests/unit/lnurl.test.js

@@ -164,3 +164,55 @@ describe('LNURL', function () {
     assert.strictEqual(Lnurl.decipherAES(ciphertext, preimage, iv), '1234');
   });
 });
+
+describe('lightning address', function () {
+  it('can getUrlFromLnurl()', () => {
+    assert.strictEqual(Lnurl.getUrlFromLnurl('lnaddress@zbd.gg'), 'https://zbd.gg/.well-known/lnurlp/lnaddress');
+  });
+
+  it('can detect', async () => {
+    assert.ok(Lnurl.isLightningAddress('lnaddress@zbd.gg'));
+    assert.ok(Lnurl.isLightningAddress(' lnaddress@zbd.gg '));
+    assert.ok(Lnurl.isLightningAddress(' lnaddress@zbd.gg '));
+    assert.ok(Lnurl.isLightningAddress(' lnaddress@8.8.8.8 '));
+    assert.ok(Lnurl.isLightningAddress(' lnaddress@hidden.onion '));
+    assert.ok(!Lnurl.isLightningAddress(' bla bla '));
+    assert.ok(!Lnurl.isLightningAddress(''));
+    assert.ok(!Lnurl.isLightningAddress('@'));
+    assert.ok(!Lnurl.isLightningAddress('@a'));
+    assert.ok(!Lnurl.isLightningAddress('a@'));
+
+    const LN = new Lnurl('lnaddress@zbd.gg');
+
+    // poor-man's mock:
+    LN._fetchGet = LN.fetchGet;
+    let requestedUri = -1;
+    LN.fetchGet = actuallyRequestedUri => {
+      requestedUri = actuallyRequestedUri;
+      return {
+        minSendable: 1000,
+        maxSendable: 45000000,
+        commentAllowed: 150,
+        tag: 'payRequest',
+        metadata: '[["text/plain","lnaddress - lightningaddress.com"],["text/identifier","lnaddress@zbd.gg"],["image/png;base64","img"]]',
+        callback: 'https://api.zebedee.io/v0/process-static-charges/9a44621d-0665-44eb-96af-e06534311be5',
+      };
+    };
+
+    const lnurlpayPayload = await LN.callLnurlPayService();
+    assert.deepStrictEqual(lnurlpayPayload, {
+      amount: 1,
+      callback: 'https://api.zebedee.io/v0/process-static-charges/9a44621d-0665-44eb-96af-e06534311be5',
+      commentAllowed: 150,
+      description: 'lnaddress - lightningaddress.com',
+      domain: 'api.zebedee.io',
+      fixed: false,
+      image: 'data:image/png;base64,img',
+      max: 45000,
+      metadata: '[["text/plain","lnaddress - lightningaddress.com"],["text/identifier","lnaddress@zbd.gg"],["image/png;base64","img"]]',
+      min: 1,
+    });
+
+    assert.strictEqual(requestedUri, 'https://zbd.gg/.well-known/lnurlp/lnaddress');
+  });
+});