Profile redirect notes (#5746)

* Serialize moved accounts into REST and ActivityPub APIs

* Parse federated moved accounts from ActivityPub

* Add note about moved accounts to public profiles

* Add moved account message to web UI

* Fix code style issues

7 files changed, 180 insertions, 3 deletions

diff --git a/app/javascript/mastodon/features/account/components/header.js b/app/javascript/mastodon/features/account/components/header.js
index f0d2d481f..b2399ae9b 100644
--- a/app/javascript/mastodon/features/account/components/header.js
+++ b/app/javascript/mastodon/features/account/components/header.js
@@ -7,6 +7,7 @@ import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { autoPlayGif, me } from '../../../initial_state';
+import classNames from 'classnames';
 
 const messages = defineMessages({
   unfollow: { id: 'account.unfollow', defaultMessage: 'Unfollow' },
@@ -102,6 +103,10 @@ export default class Header extends ImmutablePureComponent {
       }
     }
 
+    if (account.get('moved')) {
+      actionBtn = '';
+    }
+
     if (account.get('locked')) {
       lockedIcon = <i className='fa fa-lock' />;
     }
@@ -110,7 +115,7 @@ export default class Header extends ImmutablePureComponent {
     const displayNameHtml = { __html: account.get('display_name_html') };
 
     return (
-      <div className='account__header' style={{ backgroundImage: `url(${account.get('header')})` }}>
+      <div className={classNames('account__header', { inactive: !!account.get('moved') })} style={{ backgroundImage: `url(${account.get('header')})` }}>
         <div>
           <Avatar account={account} />
 
diff --git a/app/javascript/mastodon/features/account_timeline/components/header.js b/app/javascript/mastodon/features/account_timeline/components/header.js
index 8cf7b92ca..5e251c0e5 100644
--- a/app/javascript/mastodon/features/account_timeline/components/header.js
+++ b/app/javascript/mastodon/features/account_timeline/components/header.js
@@ -5,6 +5,7 @@ import InnerHeader from '../../account/components/header';
 import ActionBar from '../../account/components/action_bar';
 import MissingIndicator from '../../../components/missing_indicator';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import MovedNote from './moved_note';
 
 export default class Header extends ImmutablePureComponent {
 
@@ -68,6 +69,8 @@ export default class Header extends ImmutablePureComponent {
 
     return (
       <div className='account-timeline__header'>
+        {account.get('moved') && <MovedNote from={account} to={account.get('moved')} />}
+
         <InnerHeader
           account={account}
           onFollow={this.handleFollow}
diff --git a/app/javascript/mastodon/features/account_timeline/components/moved_note.js b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
new file mode 100644
index 000000000..1c0e081cc
--- /dev/null
+++ b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
@@ -0,0 +1,48 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import { FormattedMessage } from 'react-intl';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import AvatarOverlay from '../../../components/avatar_overlay';
+import DisplayName from '../../../components/display_name';
+
+export default class MovedNote extends ImmutablePureComponent {
+
+  static contextTypes = {
+    router: PropTypes.object,
+  };
+
+  static propTypes = {
+    from: ImmutablePropTypes.map.isRequired,
+    to: ImmutablePropTypes.map.isRequired,
+  };
+
+  handleAccountClick = e => {
+    if (e.button === 0) {
+      e.preventDefault();
+      this.context.router.history.push(`/accounts/${this.props.to.get('id')}`);
+    }
+
+    e.stopPropagation();
+  }
+
+  render () {
+    const { from, to } = this.props;
+    const displayNameHtml = { __html: from.get('display_name_html') };
+
+    return (
+      <div className='account__moved-note'>
+        <div className='account__moved-note__message'>
+          <div className='account__moved-note__icon-wrapper'><i className='fa fa-fw fa-suitcase account__moved-note__icon' /></div>
+          <FormattedMessage id='account.moved_to' defaultMessage='{name} has moved to:' values={{ name: <strong dangerouslySetInnerHTML={displayNameHtml} /> }} />
+        </div>
+
+        <a href={to.get('url')} onClick={this.handleAccountClick} className='detailed-status__display-name'>
+          <div className='detailed-status__display-avatar'><AvatarOverlay account={to} friend={from} /></div>
+          <DisplayName account={to} />
+        </a>
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/reducers/accounts.js b/app/javascript/mastodon/reducers/accounts.js
index 8a4d69f26..5891d0fdd 100644
--- a/app/javascript/mastodon/reducers/accounts.js
+++ b/app/javascript/mastodon/reducers/accounts.js
@@ -59,6 +59,11 @@ const normalizeAccount = (state, account) => {
   account.display_name_html = emojify(escapeTextContentForBrowser(displayName));
   account.note_emojified = emojify(account.note);
 
+  if (account.moved) {
+    state = normalizeAccount(state, account.moved);
+    account.moved = account.moved.id;
+  }
+
   return state.set(account.id, fromJS(account));
 };
 
diff --git a/app/javascript/mastodon/selectors/index.js b/app/javascript/mastodon/selectors/index.js
index d26d1b727..e47ec5183 100644
--- a/app/javascript/mastodon/selectors/index.js
+++ b/app/javascript/mastodon/selectors/index.js
@@ -4,14 +4,18 @@ import { List as ImmutableList } from 'immutable';
 const getAccountBase         = (state, id) => state.getIn(['accounts', id], null);
 const getAccountCounters     = (state, id) => state.getIn(['accounts_counters', id], null);
 const getAccountRelationship = (state, id) => state.getIn(['relationships', id], null);
+const getAccountMoved        = (state, id) => state.getIn(['accounts', state.getIn(['accounts', id, 'moved'])]);
 
 export const makeGetAccount = () => {
-  return createSelector([getAccountBase, getAccountCounters, getAccountRelationship], (base, counters, relationship) => {
+  return createSelector([getAccountBase, getAccountCounters, getAccountRelationship, getAccountMoved], (base, counters, relationship, moved) => {
     if (base === null) {
       return null;
     }
 
-    return base.merge(counters).set('relationship', relationship);
+    return base.merge(counters).withMutations(map => {
+      map.set('relationship', relationship);
+      map.set('moved', moved);
+    });
   });
 };
 
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 0ded6f159..b70769e18 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -917,6 +917,18 @@
   background-position: center;
   position: relative;
 
+  &.inactive {
+    opacity: 0.5;
+
+    .account__header__avatar {
+      filter: grayscale(100%);
+    }
+
+    .account__header__username {
+      color: $ui-primary-color;
+    }
+  }
+
   & > div {
     background: rgba(lighten($ui-base-color, 4%), 0.9);
     padding: 20px 10px;
@@ -4375,3 +4387,40 @@ noscript {
     }
   }
 }
+
+.account__moved-note {
+  padding: 14px 10px;
+  padding-bottom: 16px;
+  background: lighten($ui-base-color, 4%);
+  border-top: 1px solid lighten($ui-base-color, 8%);
+  border-bottom: 1px solid lighten($ui-base-color, 8%);
+
+  &__message {
+    position: relative;
+    margin-left: 58px;
+    color: $ui-base-lighter-color;
+    padding: 8px 0;
+    padding-top: 0;
+    padding-bottom: 4px;
+    font-size: 14px;
+
+    > span {
+      display: block;
+      overflow: hidden;
+      text-overflow: ellipsis;
+    }
+  }
+
+  &__icon-wrapper {
+    left: -26px;
+    position: absolute;
+  }
+
+  .detailed-status__display-avatar {
+    position: relative;
+  }
+
+  .detailed-status__display-name {
+    margin-bottom: 0;
+  }
+}
diff --git a/app/javascript/styles/mastodon/landing_strip.scss b/app/javascript/styles/mastodon/landing_strip.scss
index 0bf9daafd..2f7c98d54 100644
--- a/app/javascript/styles/mastodon/landing_strip.scss
+++ b/app/javascript/styles/mastodon/landing_strip.scss
@@ -34,3 +34,66 @@
 .memoriam-strip {
   background: rgba($base-shadow-color, 0.7);
 }
+
+.moved-strip {
+  padding: 14px;
+  border-radius: 4px;
+  background: rgba(darken($ui-base-color, 7%), 0.8);
+  color: $ui-secondary-color;
+  font-weight: 400;
+  margin-bottom: 20px;
+
+  strong,
+  a {
+    font-weight: 500;
+  }
+
+  a {
+    color: inherit;
+    text-decoration: underline;
+
+    &.mention {
+      text-decoration: none;
+
+      span {
+        text-decoration: none;
+      }
+
+      &:focus,
+      &:hover,
+      &:active {
+        text-decoration: none;
+
+        span {
+          text-decoration: underline;
+        }
+      }
+    }
+  }
+
+  &__message {
+    margin-bottom: 15px;
+
+    .fa {
+      margin-right: 5px;
+      color: $ui-primary-color;
+    }
+  }
+
+  &__card {
+    .detailed-status__display-avatar {
+      position: relative;
+      cursor: pointer;
+    }
+
+    .detailed-status__display-name {
+      margin-bottom: 0;
+      text-decoration: none;
+
+      span {
+        color: $ui-highlight-color;
+        font-weight: 400;
+      }
+    }
+  }
+}