PLT-7379: Timestamp on deleted, ephemeral, or pending post is a permalink (#7295)

* Removed permalink from system messages, general cleanup

* Removed permalink from deleted messages

* Removed permalink from pending messages

* Fixed post_info tests

* Changed permalink logic to remove permalinks from ephemeral messages, but leave them in place for system messages.

* Fixed check style

4 files changed, 35 insertions, 17 deletions

diff --git a/webapp/components/post_view/post_info/post_info.jsx b/webapp/components/post_view/post_info/post_info.jsx
index 2c5b98c69..cc3133764 100644
--- a/webapp/components/post_view/post_info/post_info.jsx
+++ b/webapp/components/post_view/post_info/post_info.jsx
@@ -9,6 +9,7 @@ import DotMenu from 'components/dot_menu';
 
 import * as Utils from 'utils/utils.jsx';
 import * as PostUtils from 'utils/post_utils.jsx';
+import * as ReduxPostUtils from 'mattermost-redux/utils/post_utils';
 import {emitEmojiPosted} from 'actions/post_actions.jsx';
 import Constants from 'utils/constants.jsx';
 import {Posts} from 'mattermost-redux/constants';
@@ -77,7 +78,7 @@ export default class PostInfo extends React.PureComponent {
              */
             addReaction: PropTypes.func.isRequired
         }).isRequired
-    }
+    };
 
     constructor(props) {
         super(props);
@@ -96,12 +97,12 @@ export default class PostInfo extends React.PureComponent {
 
         this.setState({showEmojiPicker});
         this.props.handleDropdownOpened(showEmojiPicker);
-    }
+    };
 
     hideEmojiPicker = () => {
         this.setState({showEmojiPicker: false});
         this.props.handleDropdownOpened(false);
-    }
+    };
 
     removePost() {
         this.props.actions.removePost(this.props.post);
@@ -131,7 +132,7 @@ export default class PostInfo extends React.PureComponent {
 
     getDotMenu = () => {
         return this.refs.dotMenu;
-    }
+    };
 
     render() {
         const post = this.props.post;
@@ -242,10 +243,16 @@ export default class PostInfo extends React.PureComponent {
             );
         }
 
+        // timestamp should not be a permalink if the post has been deleted, is ephemeral message, or is pending
+        const isPermalink = !(isEphemeral ||
+            Posts.POST_DELETED === this.props.post.state ||
+            ReduxPostUtils.isPostPendingOrFailed(this.props.post));
+
         return (
             <div className='post__header--info'>
                 <div className='col'>
                     <PostTime
+                        isPermalink={isPermalink}
                         eventTime={post.create_at}
                         useMilitaryTime={this.props.useMilitaryTime}
                         postId={post.id}
diff --git a/webapp/components/post_view/post_time.jsx b/webapp/components/post_view/post_time.jsx
index 133b6b5a3..2619c6807 100644
--- a/webapp/components/post_view/post_time.jsx
+++ b/webapp/components/post_view/post_time.jsx
@@ -13,6 +13,11 @@ export default class PostTime extends React.PureComponent {
     static propTypes = {
 
         /*
+         * If true, time will be rendered as a permalink to the post
+         */
+        isPermalink: PropTypes.bool.isRequired,
+
+        /*
          * The time to display
          */
         eventTime: PropTypes.number.isRequired,
@@ -26,12 +31,12 @@ export default class PostTime extends React.PureComponent {
          * The post id of posting being rendered
          */
         postId: PropTypes.string
-    }
+    };
 
     static defaultProps = {
         eventTime: 0,
         useMilitaryTime: false
-    }
+    };
 
     constructor(props) {
         super(props);
@@ -74,7 +79,7 @@ export default class PostTime extends React.PureComponent {
     }
 
     render() {
-        if (isMobile()) {
+        if (isMobile() || !this.props.isPermalink) {
             return this.renderTimeTag();
         }
 
diff --git a/webapp/tests/components/post_view/post_info/__snapshots__/post_info.test.jsx.snap b/webapp/tests/components/post_view/post_info/__snapshots__/post_info.test.jsx.snap
index 911008a7b..d58df052d 100644
--- a/webapp/tests/components/post_view/post_info/__snapshots__/post_info.test.jsx.snap
+++ b/webapp/tests/components/post_view/post_info/__snapshots__/post_info.test.jsx.snap
@@ -9,6 +9,7 @@ exports[`components/post_view/PostInfo should match snapshot 1`] = `
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={true}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
@@ -98,6 +99,7 @@ exports[`components/post_view/PostInfo should match snapshot, compact display 1`
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={true}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
@@ -187,6 +189,7 @@ exports[`components/post_view/PostInfo should match snapshot, ephemeral deleted
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={false}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
@@ -222,6 +225,7 @@ exports[`components/post_view/PostInfo should match snapshot, ephemeral post 1`]
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={false}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
@@ -266,6 +270,7 @@ exports[`components/post_view/PostInfo should match snapshot, flagged post 1`] =
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={true}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
@@ -355,6 +360,7 @@ exports[`components/post_view/PostInfo should match snapshot, military time 1`]
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={true}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={true}
     />
@@ -418,6 +424,7 @@ exports[`components/post_view/PostInfo should match snapshot, pinned post 1`] =
   >
     <PostTime
       eventTime={1502715365009}
+      isPermalink={true}
       postId="e584uzbwwpny9kengqayx5ayzw"
       useMilitaryTime={false}
     />
diff --git a/webapp/utils/post_utils.jsx b/webapp/utils/post_utils.jsx
index 83fb666af..1ff16a5ab 100644
--- a/webapp/utils/post_utils.jsx
+++ b/webapp/utils/post_utils.jsx
@@ -9,7 +9,7 @@ import UserStore from 'stores/user_store.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
 
 export function isSystemMessage(post) {
-    return post.type && (post.type.lastIndexOf(Constants.SYSTEM_MESSAGE_PREFIX) === 0);
+    return Boolean(post.type && (post.type.lastIndexOf(Constants.SYSTEM_MESSAGE_PREFIX) === 0));
 }
 
 export function isFromWebhook(post) {
@@ -53,11 +53,11 @@ export function getProfilePicSrcForPost(post, user) {
 }
 
 export function canDeletePost(post) {
-    var isOwner = isPostOwner(post);
-    var isSystemAdmin = UserStore.isSystemAdminForCurrentUser();
-    var isTeamAdmin = TeamStore.isTeamAdminForCurrentTeam() || isSystemAdmin;
-    var isChannelAdmin = ChannelStore.isChannelAdminForCurrentChannel() || isTeamAdmin;
-    var isAdmin = isChannelAdmin || isTeamAdmin || isSystemAdmin;
+    const isOwner = isPostOwner(post);
+    const isSystemAdmin = UserStore.isSystemAdminForCurrentUser();
+    const isTeamAdmin = TeamStore.isTeamAdminForCurrentTeam() || isSystemAdmin;
+    const isChannelAdmin = ChannelStore.isChannelAdminForCurrentChannel() || isTeamAdmin;
+    const isAdmin = isChannelAdmin || isTeamAdmin || isSystemAdmin;
 
     if (global.window.mm_license.IsLicensed === 'true') {
         return (global.window.mm_config.RestrictPostDelete === Constants.PERMISSIONS_DELETE_POST_ALL && (isOwner || isChannelAdmin)) ||
@@ -69,15 +69,14 @@ export function canDeletePost(post) {
 }
 
 export function canEditPost(post, editDisableAction) {
-    var isOwner = isPostOwner(post);
-
-    var canEdit = isOwner && !isSystemMessage(post);
+    const isOwner = isPostOwner(post);
+    let canEdit = isOwner && !isSystemMessage(post);
 
     if (canEdit && global.window.mm_license.IsLicensed === 'true') {
         if (global.window.mm_config.AllowEditPost === Constants.ALLOW_EDIT_POST_NEVER) {
             canEdit = false;
         } else if (global.window.mm_config.AllowEditPost === Constants.ALLOW_EDIT_POST_TIME_LIMIT) {
-            var timeLeft = (post.create_at + (global.window.mm_config.PostEditTimeLimit * 1000)) - Utils.getTimestamp();
+            const timeLeft = (post.create_at + (global.window.mm_config.PostEditTimeLimit * 1000)) - Utils.getTimestamp();
             if (timeLeft > 0) {
                 editDisableAction.fireAfter(timeLeft + 1000);
             } else {