Experimental implementation for webapp plugins (#7185)

* Start of experimental implementation for webapp plugins

* Updates to webapp plugin architecture

* Update pluggable test

* Remove debug code

15 files changed, 354 insertions, 32 deletions

diff --git a/webapp/components/at_mention/at_mention.jsx b/webapp/components/at_mention/at_mention.jsx
index 9bb2d2aad..668222cc2 100644
--- a/webapp/components/at_mention/at_mention.jsx
+++ b/webapp/components/at_mention/at_mention.jsx
@@ -2,6 +2,7 @@
 // See License.txt for license information.
 
 import ProfilePopover from 'components/profile_popover.jsx';
+import Pluggable from 'plugins/pluggable';
 import {Client4} from 'mattermost-redux/client';
 
 import React from 'react';
@@ -79,13 +80,15 @@ export default class AtMention extends React.PureComponent {
                     placement='right'
                     rootClose={true}
                     overlay={
-                        <ProfilePopover
-                            user={user}
-                            src={Client4.getProfilePictureUrl(user.id, user.last_picture_update)}
-                            hide={this.hideProfilePopover}
-                            isRHS={this.props.isRHS}
-                            hasMention={this.props.hasMention}
-                        />
+                        <Pluggable>
+                            <ProfilePopover
+                                user={user}
+                                src={Client4.getProfilePictureUrl(user.id, user.last_picture_update)}
+                                hide={this.hideProfilePopover}
+                                isRHS={this.props.isRHS}
+                                hasMention={this.props.hasMention}
+                            />
+                        </Pluggable>
                     }
                 >
                     <a className='mention-link'>{'@' + user.username}</a>
diff --git a/webapp/components/profile_picture.jsx b/webapp/components/profile_picture.jsx
index fbaa46127..90cea9d34 100644
--- a/webapp/components/profile_picture.jsx
+++ b/webapp/components/profile_picture.jsx
@@ -1,6 +1,8 @@
 // Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
+
 import ProfilePopover from './profile_popover.jsx';
+import Pluggable from 'plugins/pluggable';
 import * as Utils from 'utils/utils.jsx';
 
 import PropTypes from 'prop-types';
@@ -56,16 +58,18 @@ export default class ProfilePicture extends React.Component {
                     placement='right'
                     rootClose={true}
                     overlay={
-                        <ProfilePopover
-                            user={this.props.user}
-                            src={this.props.src}
-                            status={this.props.status}
-                            isBusy={this.props.isBusy}
-                            hide={this.hideProfilePopover}
-                            isRHS={this.props.isRHS}
-                            hasMention={this.props.hasMention}
-                        />
-                }
+                        <Pluggable>
+                            <ProfilePopover
+                                user={this.props.user}
+                                src={this.props.src}
+                                status={this.props.status}
+                                isBusy={this.props.isBusy}
+                                hide={this.hideProfilePopover}
+                                isRHS={this.props.isRHS}
+                                hasMention={this.props.hasMention}
+                            />
+                        </Pluggable>
+                    }
                 >
                     <span className='status-wrapper'>
                         <img
diff --git a/webapp/components/user_profile.jsx b/webapp/components/user_profile.jsx
index d4d900e6a..28b1e5bfb 100644
--- a/webapp/components/user_profile.jsx
+++ b/webapp/components/user_profile.jsx
@@ -2,6 +2,7 @@
 // See License.txt for license information.
 
 import ProfilePopover from './profile_popover.jsx';
+import Pluggable from 'plugins/pluggable';
 import * as Utils from 'utils/utils.jsx';
 
 import {OverlayTrigger} from 'react-bootstrap';
@@ -76,15 +77,17 @@ export default class UserProfile extends React.Component {
                 placement='right'
                 rootClose={true}
                 overlay={
-                    <ProfilePopover
-                        user={this.props.user}
-                        src={profileImg}
-                        status={this.props.status}
-                        isBusy={this.props.isBusy}
-                        hide={this.hideProfilePopover}
-                        isRHS={this.props.isRHS}
-                        hasMention={this.props.hasMention}
-                    />
+                    <Pluggable>
+                        <ProfilePopover
+                            user={this.props.user}
+                            src={profileImg}
+                            status={this.props.status}
+                            isBusy={this.props.isBusy}
+                            hide={this.hideProfilePopover}
+                            isRHS={this.props.isRHS}
+                            hasMention={this.props.hasMention}
+                        />
+                    </Pluggable>
                 }
             >
                 <div
diff --git a/webapp/package.json b/webapp/package.json
index 8691f6abf..79731d1b4 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -25,7 +25,7 @@
     "localforage": "1.5.0",
     "marked": "mattermost/marked#5194fc037b35036910c6542b04bb471fe56b27a9",
     "match-at": "0.1.0",
-    "mattermost-redux": "mattermost/mattermost-redux#webapp-4.1",
+    "mattermost-redux": "mattermost/mattermost-redux#master",
     "object-assign": "4.1.1",
     "pdfjs-dist": "1.9.441",
     "perfect-scrollbar": "0.7.1",
diff --git a/webapp/plugins/index.js b/webapp/plugins/index.js
new file mode 100644
index 000000000..2e8240cec
--- /dev/null
+++ b/webapp/plugins/index.js
@@ -0,0 +1,51 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+// EXPERIMENTAL - SUBJECT TO CHANGE
+
+import store from 'stores/redux_store.jsx';
+import {ActionTypes} from 'utils/constants.jsx';
+import {getSiteURL} from 'utils/url.jsx';
+
+window.plugins = {};
+
+export function registerComponents(components) {
+    store.dispatch({
+        type: ActionTypes.RECEIVED_PLUGIN_COMPONENTS,
+        data: components || {}
+    });
+}
+
+export function initializePlugins() {
+    const pluginJson = window.mm_config.Plugins || '[]';
+
+    let pluginManifests;
+    try {
+        pluginManifests = JSON.parse(pluginJson);
+    } catch (error) {
+        console.error('Invalid plugins JSON: ' + error); //eslint-disable-line no-console
+        return;
+    }
+
+    pluginManifests.forEach((m) => {
+        function onLoad() {
+            // Add the plugin's js to the page
+            const script = document.createElement('script');
+            script.type = 'text/javascript';
+            script.text = this.responseText;
+            document.getElementsByTagName('head')[0].appendChild(script);
+
+            // Initialize the plugin
+            console.log('Registering ' + m.id + ' plugin...'); //eslint-disable-line no-console
+            const plugin = window.plugins[m.id];
+            plugin.initialize(registerComponents, store);
+            console.log('...done'); //eslint-disable-line no-console
+        }
+
+        // Fetch the plugin's bundled js
+        const xhrObj = new XMLHttpRequest();
+        xhrObj.open('GET', getSiteURL() + m.bundle_path, true);
+        xhrObj.addEventListener('load', onLoad);
+        xhrObj.send('');
+    });
+}
diff --git a/webapp/plugins/pluggable/index.js b/webapp/plugins/pluggable/index.js
new file mode 100644
index 000000000..d00f18a5d
--- /dev/null
+++ b/webapp/plugins/pluggable/index.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import {connect} from 'react-redux';
+import {getTheme} from 'mattermost-redux/selectors/entities/preferences';
+
+import Pluggable from './pluggable.jsx';
+
+function mapStateToProps(state, ownProps) {
+    return {
+        ...ownProps,
+        components: state.plugins.components,
+        theme: getTheme(state)
+    };
+}
+
+export default connect(mapStateToProps)(Pluggable);
diff --git a/webapp/plugins/pluggable/pluggable.jsx b/webapp/plugins/pluggable/pluggable.jsx
new file mode 100644
index 000000000..566e024e5
--- /dev/null
+++ b/webapp/plugins/pluggable/pluggable.jsx
@@ -0,0 +1,55 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+// EXPERIMENTAL - SUBJECT TO CHANGE
+
+import React from 'react';
+import PropTypes from 'prop-types';
+
+export default class Pluggable extends React.PureComponent {
+    static propTypes = {
+
+        /*
+         * Should be a single overridable React component
+         */
+        children: PropTypes.element.isRequired,
+
+        /*
+         * Components for overriding provided by plugins
+         */
+        components: PropTypes.object.isRequired,
+
+        /*
+         * Logged in user's theme
+         */
+        theme: PropTypes.object.isRequired
+    }
+
+    render() {
+        const child = React.Children.only(this.props.children).type;
+        const components = this.props.components;
+
+        if (child == null) {
+            return null;
+        }
+
+        // Include any props passed to this component or to the child component
+        let props = {...this.props};
+        Reflect.deleteProperty(props, 'children');
+        Reflect.deleteProperty(props, 'components');
+        props = {...props, ...this.props.children.props};
+
+        // Override the default component with any registered plugin's component
+        if (components.hasOwnProperty(child.name)) {
+            const PluginComponent = components[child.name];
+            return (
+                <PluginComponent
+                    {...props}
+                    theme={this.props.theme}
+                />
+            );
+        }
+
+        return React.cloneElement(this.props.children, {...props});
+    }
+}
diff --git a/webapp/reducers/index.js b/webapp/reducers/index.js
index ff2eb0d50..eb245d851 100644
--- a/webapp/reducers/index.js
+++ b/webapp/reducers/index.js
@@ -2,7 +2,9 @@
 // See License.txt for license information.
 
 import views from './views';
+import plugins from './plugins';
 
 export default {
-    views
+    views,
+    plugins
 };
diff --git a/webapp/reducers/plugins/index.js b/webapp/reducers/plugins/index.js
new file mode 100644
index 000000000..9cad72715
--- /dev/null
+++ b/webapp/reducers/plugins/index.js
@@ -0,0 +1,22 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import {combineReducers} from 'redux';
+import {ActionTypes} from 'utils/constants.jsx';
+
+function components(state = {}, action) {
+    switch (action.type) {
+    case ActionTypes.RECEIVED_PLUGIN_COMPONENTS: {
+        if (action.data) {
+            return {...action.data, ...state};
+        }
+        return state;
+    }
+    default:
+        return state;
+    }
+}
+
+export default combineReducers({
+    components
+});
diff --git a/webapp/root.jsx b/webapp/root.jsx
index 635c8e93b..65d4cb0e4 100644
--- a/webapp/root.jsx
+++ b/webapp/root.jsx
@@ -14,6 +14,7 @@ import * as Websockets from 'actions/websocket_actions.jsx';
 import {loadMeAndConfig} from 'actions/user_actions.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
 import * as I18n from 'i18n/i18n.jsx';
+import {initializePlugins} from 'plugins';
 
 // Import our styles
 import 'bootstrap-colorpicker/dist/css/bootstrap-colorpicker.css';
@@ -90,6 +91,7 @@ function preRenderSetup(callwhendone) {
 
     function afterIntl() {
         $.when(d1).done(() => {
+            initializePlugins();
             I18n.doAddLocaleData();
             callwhendone();
         });
diff --git a/webapp/store/index.js b/webapp/store/index.js
index 2b8a4fb28..2da472881 100644
--- a/webapp/store/index.js
+++ b/webapp/store/index.js
@@ -104,7 +104,7 @@ export default function configureStore(initialState) {
             autoRehydrate: {
                 log: false
             },
-            blacklist: ['errors', 'offline', 'requests', 'entities', 'views'],
+            blacklist: ['errors', 'offline', 'requests', 'entities', 'views', 'plugins'],
             debounce: 500,
             transforms: [
                 setTransformer
diff --git a/webapp/tests/plugins/__snapshots__/pluggable.test.jsx.snap b/webapp/tests/plugins/__snapshots__/pluggable.test.jsx.snap
new file mode 100644
index 000000000..2f7a5e232
--- /dev/null
+++ b/webapp/tests/plugins/__snapshots__/pluggable.test.jsx.snap
@@ -0,0 +1,111 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`plugins/Pluggable should match snapshot with no overridden component 1`] = `
+<IntlProvider>
+  <Pluggable
+    components={Object {}}
+    theme={Object {}}
+  >
+    <ProfilePopover
+      hasMention={false}
+      isRHS={false}
+      src="src"
+      theme={Object {}}
+      user={Object {}}
+    >
+      <Popover
+        bsClass="popover"
+        id="user-profile-popover"
+        placement="right"
+        theme={Object {}}
+        title="@undefined"
+      >
+        <div
+          className="popover right"
+          id="user-profile-popover"
+          role="tooltip"
+          style={
+            Object {
+              "display": "block",
+              "left": undefined,
+              "top": undefined,
+            }
+          }
+          theme={Object {}}
+        >
+          <div
+            className="arrow"
+            style={
+              Object {
+                "left": undefined,
+                "top": undefined,
+              }
+            }
+          />
+          <h3
+            className="popover-title"
+          >
+            @undefined
+          </h3>
+          <div
+            className="popover-content"
+          >
+            <img
+              className="user-popover__image"
+              height="128"
+              src="src"
+              width="128"
+            />
+            <div
+              className="popover__row first"
+              data-toggle="tooltip"
+            >
+              <a
+                className="text-nowrap text-lowercase user-popover__email"
+                href="#"
+                onClick={[Function]}
+              >
+                <i
+                  className="fa fa-paper-plane"
+                />
+                <FormattedMessage
+                  defaultMessage="Send Message"
+                  id="user_profile.send.dm"
+                  values={Object {}}
+                >
+                  <span>
+                    Send Message
+                  </span>
+                </FormattedMessage>
+              </a>
+            </div>
+          </div>
+        </div>
+      </Popover>
+    </ProfilePopover>
+  </Pluggable>
+</IntlProvider>
+`;
+
+exports[`plugins/Pluggable should match snapshot with overridden component 1`] = `
+<Pluggable
+  components={
+    Object {
+      "ProfilePopover": [Function],
+    }
+  }
+  theme={Object {}}
+>
+  <ProfilePopoverPlugin
+    hasMention={false}
+    isRHS={false}
+    src="src"
+    theme={Object {}}
+    user={Object {}}
+  >
+    <span>
+      ProfilePopoverPlugin
+    </span>
+  </ProfilePopoverPlugin>
+</Pluggable>
+`;
diff --git a/webapp/tests/plugins/pluggable.test.jsx b/webapp/tests/plugins/pluggable.test.jsx
new file mode 100644
index 000000000..96dedb037
--- /dev/null
+++ b/webapp/tests/plugins/pluggable.test.jsx
@@ -0,0 +1,50 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+import {mount} from 'enzyme';
+import {IntlProvider} from 'react-intl';
+
+import Pluggable from 'plugins/pluggable/pluggable.jsx';
+import ProfilePopover from 'components/profile_popover.jsx';
+
+class ProfilePopoverPlugin extends React.PureComponent {
+    render() {
+        return <span>{'ProfilePopoverPlugin'}</span>;
+    }
+}
+
+describe('plugins/Pluggable', () => {
+    test('should match snapshot with overridden component', () => {
+        const wrapper = mount(
+            <Pluggable
+                components={{ProfilePopover: ProfilePopoverPlugin}}
+                theme={{}}
+            >
+                <ProfilePopover
+                    user={{}}
+                    src='src'
+                />
+            </Pluggable>
+        );
+        expect(wrapper).toMatchSnapshot();
+    });
+
+    test('should match snapshot with no overridden component', () => {
+        window.mm_config = {};
+        const wrapper = mount(
+            <IntlProvider>
+                <Pluggable
+                    components={{}}
+                    theme={{}}
+                >
+                    <ProfilePopover
+                        user={{}}
+                        src='src'
+                    />
+                </Pluggable>
+            </IntlProvider>
+        );
+        expect(wrapper).toMatchSnapshot();
+    });
+});
diff --git a/webapp/utils/constants.jsx b/webapp/utils/constants.jsx
index ea6d1dba3..858ea6bbf 100644
--- a/webapp/utils/constants.jsx
+++ b/webapp/utils/constants.jsx
@@ -193,7 +193,9 @@ export const ActionTypes = keyMirror({
 
     BROWSER_CHANGE_FOCUS: null,
 
-    EMOJI_POSTED: null
+    EMOJI_POSTED: null,
+
+    RECEIVED_PLUGIN_COMPONENTS: null
 });
 
 export const WebrtcActionTypes = keyMirror({
diff --git a/webapp/yarn.lock b/webapp/yarn.lock
index b3d9ba14b..b376d57d6 100644
--- a/webapp/yarn.lock
+++ b/webapp/yarn.lock
@@ -5063,9 +5063,9 @@ math-expression-evaluator@^1.2.14:
   version "1.2.16"
   resolved "https://registry.yarnpkg.com/math-expression-evaluator/-/math-expression-evaluator-1.2.16.tgz#b357fa1ca9faefb8e48d10c14ef2bcb2d9f0a7c9"
 
-mattermost-redux@mattermost/mattermost-redux#webapp-4.1:
+mattermost-redux@mattermost/mattermost-redux#master:
   version "0.0.1"
-  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/31bb5c2f21b504c4b7cab6624e4884bd3fc9f294"
+  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/c5a9c96468cb8099230c447c87f2ca630bbfb531"
   dependencies:
     deep-equal "1.0.1"
     harmony-reflect "1.5.1"