[PLT-6710] /rename [text] slash command: Rename the channel (#6570)

* /rename [text] slash command: Rename the channel

* update strings per review

7 files changed, 124 insertions, 3 deletions

diff --git a/app/command_channel_rename.go b/app/command_channel_rename.go
new file mode 100644
index 000000000..f18b127ad
--- /dev/null
+++ b/app/command_channel_rename.go
@@ -0,0 +1,69 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/platform/model"
+	goi18n "github.com/nicksnyder/go-i18n/i18n"
+)
+
+type RenameProvider struct {
+}
+
+const (
+	CMD_RENAME = "rename"
+)
+
+func init() {
+	RegisterCommandProvider(&RenameProvider{})
+}
+
+func (me *RenameProvider) GetTrigger() string {
+	return CMD_RENAME
+}
+
+func (me *RenameProvider) GetCommand(T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_RENAME,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_channel_rename.desc"),
+		AutoCompleteHint: T("api.command_channel_rename.hint"),
+		DisplayName:      T("api.command_channel_rename.name"),
+	}
+}
+
+func (me *RenameProvider) DoCommand(args *model.CommandArgs, message string) *model.CommandResponse {
+	channel, err := GetChannel(args.ChannelId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.channel.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if channel.Type == model.CHANNEL_OPEN && !SessionHasPermissionToChannel(args.Session, args.ChannelId, model.PERMISSION_MANAGE_PUBLIC_CHANNEL_PROPERTIES) {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.permission.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if channel.Type == model.CHANNEL_PRIVATE && !SessionHasPermissionToChannel(args.Session, args.ChannelId, model.PERMISSION_MANAGE_PRIVATE_CHANNEL_PROPERTIES) {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.permission.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if channel.Type == model.CHANNEL_GROUP || channel.Type == model.CHANNEL_DIRECT {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.direct_group.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if len(message) == 0 {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.message.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	patch := &model.ChannelPatch{
+		DisplayName: new(string),
+	}
+	*patch.DisplayName = message
+
+	_, err = PatchChannel(channel, patch, args.UserId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_channel_rename.update_channel.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	return &model.CommandResponse{}
+}
diff --git a/i18n/en.json b/i18n/en.json
index f1657efcb..d9ba232ef 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -604,6 +604,42 @@
     "translation": "Error to update the current channel."
   },
   {
+    "id": "api.command_channel_rename.name",
+    "translation": "rename"
+  },
+  {
+    "id": "api.command_channel_rename.hint",
+    "translation": "[text]"
+  },
+  {
+    "id": "api.command_channel_rename.desc",
+    "translation": "Rename the channel"
+  },
+  {
+    "id": "api.command_channel_rename.channel.app_error",
+    "translation": "Error to retrieve the current channel."
+  },
+  {
+    "id": "api.command_channel_rename.permission.app_error",
+    "translation": "You do not have the appropriate permissions to rename the channel."
+  },
+  {
+    "id": "api.command_channel_rename.message.app_error",
+    "translation": "A message must be provided with the /rename command."
+  },
+  {
+    "id": "api.command_channel_rename.update_channel.app_error",
+    "translation": "Error to update the current channel."
+  },
+  {
+    "id": "api.command_channel_rename.update_channel.success",
+    "translation": "Channel name successfully updated."
+  },
+  {
+    "id": "api.command_channel_rename.direct_group.app_error",
+    "translation": "Cannot rename direct message channels."
+  },
+  {
     "id": "api.command_expand.desc",
     "translation": "Turn off auto-collapsing of image previews"
   },
diff --git a/webapp/actions/global_actions.jsx b/webapp/actions/global_actions.jsx
index dc5617dde..ce14661f6 100644
--- a/webapp/actions/global_actions.jsx
+++ b/webapp/actions/global_actions.jsx
@@ -235,6 +235,14 @@ export function showChannelPurposeUpdateModal(channel) {
     });
 }
 
+export function showChannelNameUpdateModal(channel) {
+    AppDispatcher.handleViewAction({
+        type: ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL,
+        value: true,
+        channel
+    });
+}
+
 export function showGetPostLinkModal(post) {
     AppDispatcher.handleViewAction({
         type: ActionTypes.TOGGLE_GET_POST_LINK_MODAL,
diff --git a/webapp/components/create_post.jsx b/webapp/components/create_post.jsx
index 328f182a3..e5ead4e84 100644
--- a/webapp/components/create_post.jsx
+++ b/webapp/components/create_post.jsx
@@ -243,6 +243,12 @@ export default class CreatePost extends React.Component {
             return;
         }
 
+        if (!isDirectOrGroup && this.state.message.trimRight() === '/rename') {
+            GlobalActions.showChannelNameUpdateModal(updateChannel);
+            this.setState({message: ''});
+            return;
+        }
+
         this.doSubmit(e);
     }
 
diff --git a/webapp/components/navbar.jsx b/webapp/components/navbar.jsx
index fc2ade7ab..81959f352 100644
--- a/webapp/components/navbar.jsx
+++ b/webapp/components/navbar.jsx
@@ -115,6 +115,7 @@ export default class Navbar extends React.Component {
         ModalStore.addModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.showEditChannelHeaderModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL, this.showChannelPurposeModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL, this.showRenameChannelModal);
         $('.inner-wrap').click(this.hideSidebars);
         document.addEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
@@ -128,6 +129,7 @@ export default class Navbar extends React.Component {
         ModalStore.removeModalListener(ActionTypes.TOGGLE_QUICK_SWITCH_MODAL, this.toggleQuickSwitchModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL, this.hideEditChannelHeaderModal);
         ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL, this.hideChannelPurposeModal);
+        ModalStore.addModalListener(ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL, this.hideRenameChannelModal);
         document.removeEventListener('keydown', this.handleQuickSwitchKeyPress);
     }
 
@@ -218,9 +220,7 @@ export default class Navbar extends React.Component {
         });
     }
 
-    showRenameChannelModal(e) {
-        e.preventDefault();
-
+    showRenameChannelModal() {
         this.setState({
             showRenameChannelModal: true
         });
diff --git a/webapp/stores/modal_store.jsx b/webapp/stores/modal_store.jsx
index 666219d41..34bab780c 100644
--- a/webapp/stores/modal_store.jsx
+++ b/webapp/stores/modal_store.jsx
@@ -43,6 +43,7 @@ class ModalStoreClass extends EventEmitter {
         case ActionTypes.TOGGLE_QUICK_SWITCH_MODAL:
         case ActionTypes.TOGGLE_CHANNEL_HEADER_UPDATE_MODAL:
         case ActionTypes.TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL:
+        case ActionTypes.TOGGLE_CHANNEL_NAME_UPDATE_MODAL:
             this.emit(type, value, args);
             break;
         }
diff --git a/webapp/utils/constants.jsx b/webapp/utils/constants.jsx
index 69492e95c..31211952a 100644
--- a/webapp/utils/constants.jsx
+++ b/webapp/utils/constants.jsx
@@ -176,6 +176,7 @@ export const ActionTypes = keyMirror({
     TOGGLE_QUICK_SWITCH_MODAL: null,
     TOGGLE_CHANNEL_HEADER_UPDATE_MODAL: null,
     TOGGLE_CHANNEL_PURPOSE_UPDATE_MODAL: null,
+    TOGGLE_CHANNEL_NAME_UPDATE_MODAL: null,
 
     SUGGESTION_PRETEXT_CHANGED: null,
     SUGGESTION_RECEIVED_SUGGESTIONS: null,