[PLT-6707] /header [text] slash command: Edit the channel header (#6566)

* add /header slash command

* update websocket

* updater per review

2 files changed, 21 insertions, 3 deletions

diff --git a/webapp/components/create_post.jsx b/webapp/components/create_post.jsx
index d0f2a0afd..8ec671e45 100644
--- a/webapp/components/create_post.jsx
+++ b/webapp/components/create_post.jsx
@@ -76,14 +76,15 @@ export default class CreatePost extends React.Component {
 
         PostStore.clearDraftUploads();
 
-        const channelId = ChannelStore.getCurrentId();
-        const draft = PostStore.getDraft(channelId);
-
+        const channel = ChannelStore.getCurrent();
+        const channelId = channel.id;
+        const draft = PostStore.getPostDraft(channelId);
         const stats = ChannelStore.getCurrentStats();
         const members = stats.member_count - 1;
 
         this.state = {
             channelId,
+            channel,
             message: draft.message,
             uploadsInProgress: draft.uploadsInProgress,
             fileInfos: draft.fileInfos,
@@ -213,12 +214,20 @@ export default class CreatePost extends React.Component {
     handleSubmit(e) {
         const stats = ChannelStore.getCurrentStats();
         const members = stats.member_count - 1;
+        const updateChannel = ChannelStore.getCurrent();
 
         if ((this.state.message.includes('@all') || this.state.message.includes('@channel')) && members >= Constants.NOTIFY_ALL_MEMBERS) {
             this.setState({totalMembers: members});
             this.showNotifyAllModal();
             return;
         }
+
+        if (this.state.message.endsWith('/header ')) {
+            GlobalActions.showChannelHeaderUpdateModal(updateChannel);
+            this.setState({message: ''});
+            return;
+        }
+
         this.doSubmit(e);
     }
 
diff --git a/webapp/components/navbar.jsx b/webapp/components/navbar.jsx
index 0f8de01a3..b27e22709 100644
--- a/webapp/components/navbar.jsx
+++ b/webapp/components/navbar.jsx
@@ -55,6 +55,7 @@ export default class Navbar extends React.Component {
         this.showSearch = this.showSearch.bind(this);
 
         this.showEditChannelHeaderModal = this.showEditChannelHeaderModal.bind(this);
+        this.hideEditChannelHeaderModal = this.hideEditChannelHeaderModal.bind(this);
         this.showRenameChannelModal = this.showRenameChannelModal.bind(this);
         this.hideRenameChannelModal = this.hideRenameChannelModal.bind(this);
         this.isStateValid = this.isStateValid.bind(this);
@@ -110,6 +111,7 @@ export default class Navbar extends React.Component {
         UserStore.addChangeListener(this.onChange);
         PreferenceStore.addChangeListener(this.onChange);
         ModalStore.addModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.showEditChannelHeaderModal);
         $('.inner-wrap').click(this.hideSidebars);
         document.addEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
@@ -121,6 +123,7 @@ export default class Navbar extends React.Component {
         UserStore.removeChangeListener(this.onChange);
         PreferenceStore.removeChangeListener(this.onChange);
         ModalStore.removeModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.hideEditChannelHeaderModal);
         document.removeEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
 
@@ -193,6 +196,12 @@ export default class Navbar extends React.Component {
         });
     }
 
+    hideEditChannelHeaderModal() {
+        this.setState({
+            showEditChannelHeaderModal: false
+        });
+    }
+
     showRenameChannelModal(e) {
         e.preventDefault();