Merge pull request #3925 from vector-im/t3chguy/show_redact_if_can

show redact in context menu only if has PL to/sent message

src/components/views/context_menus/MessageContextMenu.js

@@ -40,6 +40,31 @@ module.exports = React.createClass({
         onFinished: React.PropTypes.func,
     },
 
+    getInitialState: function() {
+        return {
+            canRedact: false,
+        };
+    },
+
+    componentWillMount: function() {
+        MatrixClientPeg.get().on('RoomMember.powerLevel', this._checkCanRedact);
+        this._checkCanRedact();
+    },
+
+    componentWillUnmount: function() {
+        const cli = MatrixClientPeg.get();
+        if (cli) {
+            cli.removeListener('RoomMember.powerLevel', this._checkCanRedact);
+        }
+    },
+
+    _checkCanRedact: function() {
+        const cli = MatrixClientPeg.get();
+        const room = cli.getRoom(this.props.mxEvent.getRoomId());
+        const canRedact = room.currentState.maySendRedactionForEvent(this.props.mxEvent, cli.credentials.userId);
+        this.setState({canRedact});
+    },
+
     onResendClick: function() {
         Resend.resend(this.props.mxEvent);
         if (this.props.onFinished) this.props.onFinished();
@@ -136,7 +161,7 @@ module.exports = React.createClass({
             );
         }
 
-        if (!eventStatus && !this.props.mxEvent.isRedacted()) { // sent and not redacted
+        if (this.state.canRedact) {
             redactButton = (
                 <div className="mx_MessageContextMenu_field" onClick={this.onRedactClick}>
                     { _t('Remove') }