From ab0b8b19b0969c1be1c314b9700c8c6878a19aa0 Mon Sep 17 00:00:00 2001
From: Brendon Duncan <brendon@bitcoin.com>
Date: Thu, 23 Aug 2018 12:47:47 +1200
Subject: [PATCH] Returning legacy address for cashAddr.

---
 src/js/services/bitcoin-uri.service.js      | 134 ++++++++++++++++++--
 src/js/services/bitcoin-uri.service.spec.js |  11 ++
 2 files changed, 137 insertions(+), 8 deletions(-)

diff --git a/src/js/services/bitcoin-uri.service.js b/src/js/services/bitcoin-uri.service.js
index 2cbb9f171..0e69b5304 100644
--- a/src/js/services/bitcoin-uri.service.js
+++ b/src/js/services/bitcoin-uri.service.js
@@ -6,7 +6,7 @@
     .module('bitcoincom.services')
     .factory('bitcoinUriService', bitcoinUriService);
     
-  function bitcoinUriService() {
+  function bitcoinUriService(bitcoinCashJsService) {
     var service = {
      parse: parse 
     };
@@ -38,18 +38,136 @@
 
     }
     */
+   // bitcoincash:?r=https://bitpay.com/i/GLRoZMZxaWBqLqpoXexzoD
     function parse(uri) {
-      var address;
-      var isValid = false;
-      var legacyAddress;
-
       var parsed = {
         isValid: false
       };
 
-      parsed.address = '1JXeGEu7bNEAYu6URT6dU6g1Ys6ffSAWYW';
-      parsed.isValid = true;
-      parsed.legacyAddress = '1JXeGEu7bNEAYu6URT6dU6g1Ys6ffSAWYW';
+      // Identify prefix
+      var trimmed = uri.trim();
+      var colonSplit = /^([\w-]*):?(.*)$/.exec(trimmed);
+      if (!colonSplit) {
+        return parsed;
+      }
+
+      var addressAndParams = '';
+      var preColonLower = colonSplit[1].toLowerCase();
+      if (preColonLower === 'bitcoin') {
+        parsed.coin = 'btc';
+        addressAndParams = colonSplit[2];
+        console.log('Is btc');
+
+      } else if (/^(?:bitcoincash)|(?:bitcoin-cash)$/.test(preColonLower)) {
+        parsed.coin = 'bch';
+        addressAndParams = colonSplit[2];
+        console.log('Is bch');
+
+      } else if (colonSplit[2] === '') {
+        // No colon and no coin specifier.
+        addressAndParams = colonSplit[1];
+        console.log('No prefix.');
+
+      } else {
+        // Something with a colon in the middle that we don't recognise
+        return parsed;
+      }
+
+      // Remove erroneous leading slashes
+      var leadingSlashes = /^\/*([^\/]+(?:.*))$/.exec(addressAndParams);
+      if (!leadingSlashes) {
+        return parsed;
+      }
+      addressAndParams = leadingSlashes[1];
+
+      var questionMarkSplit = /^([^\?]*)\??([^\?]*)$/.exec(addressAndParams);
+      if (!questionMarkSplit) {
+        return parsed;
+      }
+
+      var address = questionMarkSplit[1];
+      var params = questionMarkSplit[2];
+  
+      var paramsSplit = params.split('&');
+      var others;
+      var req;
+      paramsSplit.forEach(function onParam(param){
+        var valueSplit = param.split('=');
+        if (valueSplit.length !== 2) {
+          return parsed;
+        }
+
+        var key = valueSplit[0];
+        var value = valueSplit[1];
+        switch(key) {
+          case 'amount':
+            if (parseFloat(value)) {
+              parsed.amount = value;
+            } else {
+              return parsed;
+            }  
+          break;
+
+          case 'label':
+            parsed.label = value;
+          break;
+
+          case 'message':
+            parsed.message = value;
+          break;
+
+          case 'r':
+            // Could use a more comprehesive regex to test URL validity, but then how would we know
+            // which part of the validatiion it failed?
+            if (value.startsWith('https://')) {
+              parsed.url = value;
+            } else {
+              return parsed;
+            }
+          break;
+
+          default:
+            if (key.startsWith('req-')) {
+              req = req || {};
+              req[key] = value;
+            } else {
+              others = others || {};
+              others[key] = value;
+            }
+        }
+
+      });
+
+      parsed.others = others;
+      parsed.req = req;
+        
+      // Need to do bitpay format as well? Probably
+      if (address) {
+        // Just a rough validation to exclude half-pasted addresses, or things obviously not bitcoin addresses
+        var cashAddrRe = /^((?:q|p)[a-z0-9]{41})|((?:Q|P)[A-Z0-9]{41})$/;
+        var legacyRe = /^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$/;
+
+        if (legacyRe.test(address)) {
+          parsed.address = address;
+          parsed.legacyAddress = address;
+
+        } else if (cashAddrRe.test(address)) {
+          parsed.address = address;
+          parsed.coin = 'bch';
+
+          var bchAddresses = bitcoinCashJsService.readAddress('bitcoincash:' + address);
+          parsed.legacyAddress = bchAddresses['legacy'];
+
+        } // TODO: Check for private key
+
+
+        // TODO: identify different types of addresses
+
+        // TODO: Check for a private key here too
+      }
+
+      // If has no address, must have Url.
+      parsed.isValid = !!(parsed.address || parsed.url);
 
       return parsed;
     }
diff --git a/src/js/services/bitcoin-uri.service.spec.js b/src/js/services/bitcoin-uri.service.spec.js
index 2e18bd8c4..7df819008 100644
--- a/src/js/services/bitcoin-uri.service.spec.js
+++ b/src/js/services/bitcoin-uri.service.spec.js
@@ -2,6 +2,7 @@ fdescribe('bitcoinUriService', function() {
   var bitcoinUriService;
 
   beforeEach(function() {
+    module('bitcoinCashJsModule');
     module('bitcoincom.services');
 
     inject(function($injector){
@@ -18,4 +19,14 @@ fdescribe('bitcoinUriService', function() {
     expect(parsed.coin).toBeUndefined();
     expect(parsed.legacyAddress).toBe('1JXeGEu7bNEAYu6URT6dU6g1Ys6ffSAWYW');
   });
+
+  it('cashAddr', function() {
+
+    var parsed = bitcoinUriService.parse('qqen2y3l28dpk0dzsag8w027ds96u7z4pc0uxtl0nq');
+
+    expect(parsed.isValid).toBe(true);
+    expect(parsed.address).toBe('qqen2y3l28dpk0dzsag8w027ds96u7z4pc0uxtl0nq');
+    expect(parsed.coin).toBe('bch');
+    expect(parsed.legacyAddress).toBe('15fm3EwqgBYcxkndALBfforueps5yWKReJ');
+  });
 });
\ No newline at end of file