js: getDefaultKey and verify fix

--

* DemoExtension/maindemo.js - added a Demo for retrieving the default
  signing key

* src/Errors.js - add a new Error if no default key can be determined

* src/Key.js added documentation and a TODO marker for hasSecret.

* src/Keyring.js implemented getDefaultKey

* src/permittedOperations.js: Added missing entry for verify,
    added config_opt

2 files changed, 23 insertions, 2 deletions

diff --git a/lang/js/DemoExtension/maindemo.js b/lang/js/DemoExtension/maindemo.js
index 5cde1ce8..67b811f6 100644
--- a/lang/js/DemoExtension/maindemo.js
+++ b/lang/js/DemoExtension/maindemo.js
@@ -36,7 +36,7 @@ document.addEventListener('DOMContentLoaded', function() {
                                 'answer').value = answer.data;
                         }
                     }, function(errormsg){
-                        alert( errormsg.code + ' ' + errormsg.msg);
+                        alert( errormsg.message);
                     });
             });
 
@@ -50,8 +50,18 @@ document.addEventListener('DOMContentLoaded', function() {
                                 'answer').value = answer.data;
                         }
                     }, function(errormsg){
-                        alert( errormsg.code + ' ' + errormsg.msg);
+                        alert(errormsg.message);
                     });
             });
+
+        document.getElementById('getdefaultkey').addEventListener('click',
+            function(){
+                gpgmejs.Keyring.getDefaultKey().then(function(answer){
+                    document.getElementById('defaultkey').innerHtml =
+                        answer.fingerprint;
+                }, function(errormsg){
+                    alert(errormsg.message);
+                });
+            });
     });
 });
diff --git a/lang/js/DemoExtension/mainui.html b/lang/js/DemoExtension/mainui.html
index 76b8a221..91be7bbc 100644
--- a/lang/js/DemoExtension/mainui.html
+++ b/lang/js/DemoExtension/mainui.html
@@ -29,5 +29,16 @@
     <hr>
     <h3>Result data:</h3>
     <textarea id="answer" rows="5" cols="65" wrap="hard"></textarea>
+
+    <hr>
+    <ul>
+        <li>
+            <span class="label">Default Key:</span>
+            <button id="getdefaultkey">Get</button><br>
+            <span id="defaultkey"></span>
+        </li>
+
+
+    </ul>
     </body>
 </html>