Implemented bureau authentication

* Token member for bureaus
* Exception type for failed authentication
* Authenticate function
* Bureau id to credentials
* Fixed bad constructor and toString


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5149 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/bureau/client/BureauClient.as

@@ -39,13 +39,10 @@ public class BureauClient extends Client
     public function BureauClient (token :String, bureauId :String)
     {
         super(null);
-
         _bureauId = bureauId;
-
         var creds :BureauCredentials = new BureauCredentials(_bureauId);
         creds.sessionToken = token;
         _creds = creds;
-
         _ctx = createContext();
         _director = createDirector();
     }

src/as/com/threerings/bureau/data/BureauCredentials.as

@@ -38,20 +38,26 @@ public class BureauCredentials extends Credentials
      */
     public var sessionToken :String;
 
+    /**
+     * The id of the bureau logging in.
+     */
+    public var bureauId :String;
+
     /**
      * Creates new credentials for a specific bureau.
      */
-    public function BureauCredentials (token :String)
+    public function BureauCredentials (bureauId :String)
     {
-        super(new Name("@@bureau:" + token + "@@"));
-        sessionToken = token;
+        super(new Name("@@bureau:" + bureauId + "@@"));
+        this.bureauId = bureauId;
     }
 
     /** @inheritDoc */
     override protected function toStringBuf (buf :StringBuilder) :void
     {
         super.toStringBuf(buf);
-        buf.append(" token=").append(sessionToken);
+        buf.append(" bureauId=").append(bureauId).
+            append(" token=").append(sessionToken);
     }
 
     // from interface Streamable
@@ -59,6 +65,7 @@ public class BureauCredentials extends Credentials
     {
         super.readObject(ins);
         sessionToken = (ins.readField(String) as String);
+        bureauId = (ins.readField(String) as String);
     }
 
     // from interface Streamable
@@ -66,6 +73,7 @@ public class BureauCredentials extends Credentials
     {
         super.writeObject(out);
         out.writeField(sessionToken);
+        out.writeField(bureauId);
     }
 }
 }