Add system console switch for enabling link previews (#5663)

webapp/actions/global_actions.jsx

@@ -623,6 +623,10 @@ export function redirectUserToDefaultTeam() {
 
 requestOpenGraphMetadata.openGraphMetadataOnGoingRequests = {};  // Format: {<url>: true}
 export function requestOpenGraphMetadata(url) {
+    if (global.mm_config.EnableLinkPreviews !== 'true') {
+        return;
+    }
+
     const onself = requestOpenGraphMetadata;
 
     if (!onself.openGraphMetadataOnGoingRequests[url]) {

webapp/components/admin_console/admin_sidebar.jsx

@@ -689,6 +689,16 @@ export default class AdminSidebar extends React.Component {
 
                                     }
                                 />
+                                <AdminSidebarSection
+                                    name='link_previews'
+                                    title={
+                                        <FormattedMessage
+                                            id='admin.sidebar.linkPreviews'
+                                            defaultMessage='Link Previews'
+                                        />
+
+                                    }
+                                />
                                 <AdminSidebarSection
                                     name='legal_and_support'
                                     title={

webapp/components/admin_console/link_previews_settings.jsx

@@ -0,0 +1,66 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+
+import AdminSettings from './admin_settings.jsx';
+import BooleanSetting from './boolean_setting.jsx';
+import {FormattedMessage} from 'react-intl';
+import SettingsGroup from './settings_group.jsx';
+
+export default class LinkPreviewsSettings extends AdminSettings {
+    constructor(props) {
+        super(props);
+
+        this.getConfigFromState = this.getConfigFromState.bind(this);
+
+        this.renderSettings = this.renderSettings.bind(this);
+    }
+
+    getConfigFromState(config) {
+        config.ServiceSettings.EnableLinkPreviews = this.state.enableLinkPreviews;
+
+        return config;
+    }
+
+    getStateFromConfig(config) {
+        return {
+            enableLinkPreviews: config.ServiceSettings.EnableLinkPreviews
+        };
+    }
+
+    renderTitle() {
+        return (
+            <h3>
+                <FormattedMessage
+                    id='admin.customization.linkPreviews'
+                    defaultMessage='Link Previews'
+                />
+            </h3>
+        );
+    }
+
+    renderSettings() {
+        return (
+            <SettingsGroup>
+                <BooleanSetting
+                    id='enableLinkPreviews'
+                    label={
+                        <FormattedMessage
+                            id='admin.customization.enableLinkPreviewsTitle'
+                            defaultMessage='Enable Link Previews:'
+                        />
+                    }
+                    helpText={
+                        <FormattedMessage
+                            id='admin.customization.enableLinkPreviewsDesc'
+                            defaultMessage='Enable users to display a preview of website content below the message, if available. When true, website previews can be enabled from Account Settings > Advanced > Preview pre-release features.'
+                        />
+                    }
+                    value={this.state.enableLinkPreviews}
+                    onChange={this.handleChange}
+                />
+            </SettingsGroup>
+        );
+    }
+}

webapp/components/user_settings/user_settings_advanced.jsx

@@ -53,14 +53,19 @@ export default class AdvancedSettingsDisplay extends React.Component {
             )
         };
 
+        const webrtcEnabled = global.mm_config.EnableWebrtc === 'true';
+        const linkPreviewsEnabled = global.mm_config.EnableLinkPreviews === 'true';
+
+        if (!webrtcEnabled) {
+            preReleaseFeaturesKeys = preReleaseFeaturesKeys.filter((f) => f !== 'WEBRTC_PREVIEW');
+        }
+
+        if (!linkPreviewsEnabled) {
+            preReleaseFeaturesKeys = preReleaseFeaturesKeys.filter((f) => f !== 'EMBED_PREVIEW');
+        }
+
         let enabledFeatures = 0;
         for (const [name, value] of advancedSettings) {
-            const webrtcEnabled = global.mm_config.EnableWebrtc === 'true';
-
-            if (!webrtcEnabled) {
-                preReleaseFeaturesKeys = preReleaseFeaturesKeys.filter((f) => f !== 'WEBRTC_PREVIEW');
-            }
-
             for (const key of preReleaseFeaturesKeys) {
                 const feature = PreReleaseFeatures[key];
 

webapp/i18n/en.json

@@ -1,4 +1,8 @@
 {
+  "admin.customization.enableLinkPreviewsDesc": "Enable users to display a preview of website content below the message, if available. When true, website previews can be enabled from Account Settings > Advanced > Preview pre-release features.",
+  "admin.customization.enableLinkPreviewsTitle": "Enable Link Previews:",
+  "admin.customization.linkPreviews": "Link Previews",
+  "admin.sidebar.linkPreviews": "Link Previews",
   "multiselect.go": "Go",
   "multiselect.instructions": "Use up/down arrows to navigate and enter to select",
   "multiselect.placeholder": "Search and add members",

webapp/routes/route_admin_console.jsx

@@ -35,6 +35,7 @@ import StorageSettings from 'components/admin_console/storage_settings.jsx';
 import ImageSettings from 'components/admin_console/image_settings.jsx';
 import CustomBrandSettings from 'components/admin_console/custom_brand_settings.jsx';
 import CustomEmojiSettings from 'components/admin_console/custom_emoji_settings.jsx';
+import LinkPreviewsSettings from 'components/admin_console/link_previews_settings.jsx';
 import LegalAndSupportSettings from 'components/admin_console/legal_and_support_settings.jsx';
 import NativeAppLinkSettings from 'components/admin_console/native_app_link_settings.jsx';
 import ComplianceSettings from 'components/admin_console/compliance_settings.jsx';
@@ -180,6 +181,10 @@ export default (
                 path='custom_emoji'
                 component={CustomEmojiSettings}
             />
+            <Route
+                path='link_previews'
+                component={LinkPreviewsSettings}
+            />
             <Route
                 path='legal_and_support'
                 component={LegalAndSupportSettings}