PLT-3484 OAuth2 Service Provider (#3632)

* PLT-3484 OAuth2 Service Provider

* PM text review for OAuth 2.0 Service Provider

* PLT-3484 OAuth2 Service Provider UI tweaks (#3668)

* Tweaks to help text

* Pushing OAuth improvements (#3680)

* Re-arrange System Console for OAuth 2.0 Provider

webapp/components/admin_console/admin_settings.jsx

@@ -8,7 +8,6 @@ import Client from 'client/web_client.jsx';
 
 import FormError from 'components/form_error.jsx';
 import SaveButton from 'components/admin_console/save_button.jsx';
-import Constants from 'utils/constants.jsx';
 
 export default class AdminSettings extends React.Component {
     static get propTypes() {
@@ -22,7 +21,6 @@ export default class AdminSettings extends React.Component {
 
         this.handleChange = this.handleChange.bind(this);
         this.handleSubmit = this.handleSubmit.bind(this);
-        this.onKeyDown = this.onKeyDown.bind(this);
 
         this.state = Object.assign(this.getStateFromConfig(props.config), {
             saveNeeded: false,
@@ -38,20 +36,6 @@ export default class AdminSettings extends React.Component {
         });
     }
 
-    componentDidMount() {
-        document.addEventListener('keydown', this.onKeyDown);
-    }
-
-    componentWillUnmount() {
-        document.removeEventListener('keydown', this.onKeyDown);
-    }
-
-    onKeyDown(e) {
-        if (e.keyCode === Constants.KeyCodes.ENTER) {
-            this.handleSubmit(e);
-        }
-    }
-
     handleSubmit(e) {
         e.preventDefault();
 
@@ -118,6 +102,7 @@ export default class AdminSettings extends React.Component {
                 <form
                     className='form-horizontal'
                     role='form'
+                    onSubmit={this.handleSubmit}
                 >
                     {this.renderSettings()}
                     <div className='form-group'>

webapp/components/admin_console/admin_sidebar.jsx

@@ -521,11 +521,11 @@ export default class AdminSidebar extends React.Component {
                                 }
                             >
                                 <AdminSidebarSection
-                                    name='webhooks'
+                                    name='custom'
                                     title={
                                         <FormattedMessage
-                                            id='admin.sidebar.webhooks'
-                                            defaultMessage='Webhooks and Commands'
+                                            id='admin.sidebar.customIntegrations'
+                                            defaultMessage='Custom Integrations'
                                         />
                                     }
                                 />

webapp/components/admin_console/custom_integrations_settings.jsx

@@ -24,6 +24,7 @@ export default class WebhookSettings extends AdminSettings {
         config.ServiceSettings.EnableOnlyAdminIntegrations = this.state.enableOnlyAdminIntegrations;
         config.ServiceSettings.EnablePostUsernameOverride = this.state.enablePostUsernameOverride;
         config.ServiceSettings.EnablePostIconOverride = this.state.enablePostIconOverride;
+        config.ServiceSettings.EnableOAuthServiceProvider = this.state.enableOAuthServiceProvider;
 
         return config;
     }
@@ -35,7 +36,8 @@ export default class WebhookSettings extends AdminSettings {
             enableCommands: config.ServiceSettings.EnableCommands,
             enableOnlyAdminIntegrations: config.ServiceSettings.EnableOnlyAdminIntegrations,
             enablePostUsernameOverride: config.ServiceSettings.EnablePostUsernameOverride,
-            enablePostIconOverride: config.ServiceSettings.EnablePostIconOverride
+            enablePostIconOverride: config.ServiceSettings.EnablePostIconOverride,
+            enableOAuthServiceProvider: config.ServiceSettings.EnableOAuthServiceProvider
         };
     }
 
@@ -43,8 +45,8 @@ export default class WebhookSettings extends AdminSettings {
         return (
             <h3>
                 <FormattedMessage
-                    id='admin.integrations.webhook'
-                    defaultMessage='Webhooks and Commands'
+                    id='admin.integrations.custom'
+                    defaultMessage='Custom Integrations'
                 />
             </h3>
         );
@@ -104,6 +106,23 @@ export default class WebhookSettings extends AdminSettings {
                     value={this.state.enableCommands}
                     onChange={this.handleChange}
                 />
+                <BooleanSetting
+                    id='enableOAuthServiceProvider'
+                    label={
+                        <FormattedMessage
+                            id='admin.oauth.providerTitle'
+                            defaultMessage='Enable OAuth 2.0 Service Provider: '
+                        />
+                    }
+                    helpText={
+                        <FormattedMessage
+                            id='admin.oauth.providerDescription'
+                            defaultMessage='When true, Mattermost can act as an OAuth 2.0 service provider allowing external applications to authorize API requests to Mattermost.'
+                        />
+                    }
+                    value={this.state.enableOAuthServiceProvider}
+                    onChange={this.handleChange}
+                />
                 <BooleanSetting
                     id='enableOnlyAdminIntegrations'
                     label={