Use http_password_url in GR-HTTP-PASSWORD when provided

Bug: Issue 5790
Change-Id: I9c64fe15c12dc91ff7addf14a7007775f24cf4fa

polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.html

@@ -48,13 +48,20 @@ limitations under the License.
     </style>
     <style include="gr-settings-styles"></style>
     <div class="gr-settings-styles">
-      <section>
-        <span class="title">Username</span>
-        <span class="value">[[_username]]</span>
-      </section>
-      <gr-button
-          id="generateButton"
-          on-tap="_handleGenerateTap">Generate new password</gr-button>
+      <div hidden$="[[_passwordUrl]]">
+        <section>
+          <span class="title">Username</span>
+          <span class="value">[[_username]]</span>
+        </section>
+        <gr-button
+            id="generateButton"
+            on-tap="_handleGenerateTap">Generate new password</gr-button>
+      </div>
+      <span hidden$="[[!_passwordUrl]]">
+        <a href="[[_passwordUrl]]" target="_blank" rel="noopener">
+          Obtain password</a>
+        (opens in a new tab)
+      </span>
     </div>
     <gr-overlay
         id="generatedPasswordOverlay"

polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.js

@@ -20,12 +20,21 @@
     properties: {
       _username: String,
       _generatedPassword: String,
+      _passwordUrl: String,
     },
 
     loadData: function() {
-      return this.$.restAPI.getAccount().then(function(account) {
+      var promises = [];
+
+      promises.push(this.$.restAPI.getAccount().then(function(account) {
         this._username = account.username;
-      }.bind(this));
+      }.bind(this)));
+
+      promises.push(this.$.restAPI.getConfig().then(function(info) {
+        this._passwordUrl = info.auth.http_password_url || null;
+      }.bind(this)));
+
+      return Promise.all(promises);
     },
 
     _handleGenerateTap: function() {

polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password_test.html

@@ -35,13 +35,16 @@ limitations under the License.
     var element;
     var account;
     var password;
+    var config;
 
     setup(function(done) {
       account = {username: 'user name'};
+      config = {auth: {}};
       password = 'the password';
 
       stub('gr-rest-api-interface', {
         getAccount: function() { return Promise.resolve(account); },
+        getConfig: function() { return Promise.resolve(config); },
       });
 
       element = fixture('basic');
@@ -72,6 +75,19 @@ limitations under the License.
         assert.equal(element._generatedPassword, nextPassword);
       });
     });
+
+    test('without http_password_url', function() {
+      assert.isNull(element._passwordUrl);
+    });
+
+    test('with http_password_url', function(done) {
+      config.auth.http_password_url = 'http://example.com/';
+      element.loadData().then(function() {
+        assert.isNotNull(element._passwordUrl);
+        assert.equal(element._passwordUrl, config.auth.http_password_url);
+        done();
+      });
+    });
   });
 
 </script>