Add protocol handler. Handle follow intents (#4511)

* Add protocol handler. Handle follow intents

* Add share intent

* Improve code in intents controller

* Adjust share form CSS

12 files changed, 167 insertions, 3 deletions

diff --git a/app/controllers/intents_controller.rb b/app/controllers/intents_controller.rb
new file mode 100644
index 000000000..504befd1f
--- /dev/null
+++ b/app/controllers/intents_controller.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class IntentsController < ApplicationController
+  def show
+    uri = Addressable::URI.parse(params[:uri])
+
+    if uri.scheme == 'web+mastodon'
+      case uri.host
+      when 'follow'
+        return redirect_to authorize_follow_path(acct: uri.query_values['uri'].gsub(/\Aacct:/, ''))
+      when 'share'
+        return redirect_to share_path(text: uri.query_values['text'])
+      end
+    end
+
+    not_found
+  end
+end
diff --git a/app/controllers/shares_controller.rb b/app/controllers/shares_controller.rb
new file mode 100644
index 000000000..d70d66ff8
--- /dev/null
+++ b/app/controllers/shares_controller.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class SharesController < ApplicationController
+  layout 'public'
+
+  before_action :authenticate_user!
+
+  def show
+    serializable_resource = ActiveModelSerializers::SerializableResource.new(InitialStatePresenter.new(initial_state_params), serializer: InitialStateSerializer)
+    @initial_state_json   = serializable_resource.to_json
+  end
+
+  private
+
+  def initial_state_params
+    {
+      settings: Web::Setting.find_by(user: current_user)&.data || {},
+      push_subscription: current_account.user.web_push_subscription(current_session),
+      current_account: current_account,
+      token: current_session.token,
+      admin: Account.find_local(Setting.site_contact_username),
+      text: params[:text],
+    }
+  end
+end
diff --git a/app/javascript/mastodon/containers/compose_container.js b/app/javascript/mastodon/containers/compose_container.js
new file mode 100644
index 000000000..db452d03a
--- /dev/null
+++ b/app/javascript/mastodon/containers/compose_container.js
@@ -0,0 +1,39 @@
+import React from 'react';
+import { Provider } from 'react-redux';
+import PropTypes from 'prop-types';
+import configureStore from '../store/configureStore';
+import { hydrateStore } from '../actions/store';
+import { IntlProvider, addLocaleData } from 'react-intl';
+import { getLocale } from '../locales';
+import Compose from '../features/standalone/compose';
+
+const { localeData, messages } = getLocale();
+addLocaleData(localeData);
+
+const store = configureStore();
+const initialStateContainer = document.getElementById('initial-state');
+
+if (initialStateContainer !== null) {
+  const initialState = JSON.parse(initialStateContainer.textContent);
+  store.dispatch(hydrateStore(initialState));
+}
+
+export default class TimelineContainer extends React.PureComponent {
+
+  static propTypes = {
+    locale: PropTypes.string.isRequired,
+  };
+
+  render () {
+    const { locale } = this.props;
+
+    return (
+      <IntlProvider locale={locale} messages={messages}>
+        <Provider store={store}>
+          <Compose />
+        </Provider>
+      </IntlProvider>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/containers/mastodon.js b/app/javascript/mastodon/containers/mastodon.js
index 87ab6023c..fe534d1c1 100644
--- a/app/javascript/mastodon/containers/mastodon.js
+++ b/app/javascript/mastodon/containers/mastodon.js
@@ -89,6 +89,11 @@ export default class Mastodon extends React.PureComponent {
       Notification.requestPermission();
     }
 
+    if (typeof navigator.registerProtocolHandler !== 'undefined') {
+      const handlerUrl = window.location.protocol + '//' + window.location.host + '/intent?uri=%s';
+      navigator.registerProtocolHandler('web+mastodon', handlerUrl, 'Mastodon');
+    }
+
     store.dispatch(showOnboardingOnce());
   }
 
diff --git a/app/javascript/mastodon/features/standalone/compose/index.js b/app/javascript/mastodon/features/standalone/compose/index.js
new file mode 100644
index 000000000..96d07fefb
--- /dev/null
+++ b/app/javascript/mastodon/features/standalone/compose/index.js
@@ -0,0 +1,18 @@
+import React from 'react';
+import ComposeFormContainer from '../../compose/containers/compose_form_container';
+import NotificationsContainer from '../../ui/containers/notifications_container';
+import LoadingBarContainer from '../../ui/containers/loading_bar_container';
+
+export default class Compose extends React.PureComponent {
+
+  render () {
+    return (
+      <div>
+        <ComposeFormContainer />
+        <NotificationsContainer />
+        <LoadingBarContainer className='loading-bar' />
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/reducers/compose.js b/app/javascript/mastodon/reducers/compose.js
index e137b774e..34f5dab7f 100644
--- a/app/javascript/mastodon/reducers/compose.js
+++ b/app/javascript/mastodon/reducers/compose.js
@@ -141,10 +141,20 @@ const privacyPreference = (a, b) => {
   }
 };
 
+const hydrate = (state, hydratedState) => {
+  state = clearAll(state.merge(hydratedState));
+
+  if (hydratedState.has('text')) {
+    state = state.set('text', hydratedState.get('text'));
+  }
+
+  return state;
+};
+
 export default function compose(state = initialState, action) {
   switch(action.type) {
   case STORE_HYDRATE:
-    return clearAll(state.merge(action.state.get('compose')));
+    return hydrate(state, action.state.get('compose'));
   case COMPOSE_MOUNT:
     return state.set('mounted', true);
   case COMPOSE_UNMOUNT:
diff --git a/app/javascript/packs/share.js b/app/javascript/packs/share.js
new file mode 100644
index 000000000..51e4ae38b
--- /dev/null
+++ b/app/javascript/packs/share.js
@@ -0,0 +1,24 @@
+import loadPolyfills from '../mastodon/load_polyfills';
+
+require.context('../images/', true);
+
+function loaded() {
+  const ComposeContainer = require('../mastodon/containers/compose_container').default;
+  const React = require('react');
+  const ReactDOM = require('react-dom');
+  const mountNode = document.getElementById('mastodon-compose');
+
+  if (mountNode !== null) {
+    const props = JSON.parse(mountNode.getAttribute('data-props'));
+    ReactDOM.render(<ComposeContainer {...props} />, mountNode);
+  }
+}
+
+function main() {
+  const ready = require('../mastodon/ready').default;
+  ready(loaded);
+}
+
+loadPolyfills().then(main).catch(error => {
+  console.error(error);
+});
diff --git a/app/javascript/styles/containers.scss b/app/javascript/styles/containers.scss
index 536f4e5a1..063db44db 100644
--- a/app/javascript/styles/containers.scss
+++ b/app/javascript/styles/containers.scss
@@ -44,6 +44,21 @@
   }
 }
 
+.compose-standalone {
+  .compose-form {
+    width: 400px;
+    margin: 0 auto;
+    padding: 20px 0;
+    margin-top: 40px;
+    box-sizing: border-box;
+
+    @media screen and (max-width: 400px) {
+      margin-top: 0;
+      padding: 20px;
+    }
+  }
+}
+
 .account-header {
   width: 400px;
   margin: 0 auto;
diff --git a/app/presenters/initial_state_presenter.rb b/app/presenters/initial_state_presenter.rb
index 9507aad4a..70c496be8 100644
--- a/app/presenters/initial_state_presenter.rb
+++ b/app/presenters/initial_state_presenter.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
 class InitialStatePresenter < ActiveModelSerializers::Model
-  attributes :settings, :push_subscription, :token, :current_account, :admin
+  attributes :settings, :push_subscription, :token,
+             :current_account, :admin, :text
 end
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index 0191948b1..0ac5e8319 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -34,6 +34,8 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:default_sensitive] = object.current_account.user.setting_default_sensitive
     end
 
+    store[:text] = object.text if object.text
+
     store
   end
 
diff --git a/app/views/shares/show.html.haml b/app/views/shares/show.html.haml
new file mode 100644
index 000000000..44b6f145f
--- /dev/null
+++ b/app/views/shares/show.html.haml
@@ -0,0 +1,5 @@
+- content_for :header_tags do
+  %script#initial-state{ type: 'application/json' }!= json_escape(@initial_state_json)
+  = javascript_pack_tag 'share', integrity: true, crossorigin: 'anonymous'
+
+#mastodon-compose{ data: { props: Oj.dump(default_props) } }
diff --git a/config/routes.rb b/config/routes.rb
index a1b206716..f75de5304 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -20,6 +20,7 @@ Rails.application.routes.draw do
   get '.well-known/host-meta', to: 'well_known/host_meta#show', as: :host_meta, defaults: { format: 'xml' }
   get '.well-known/webfinger', to: 'well_known/webfinger#show', as: :webfinger
   get 'manifest', to: 'manifests#show', defaults: { format: 'json' }
+  get 'intent', to: 'intents#show'
 
   devise_for :users, path: 'auth', controllers: {
     sessions:           'auth/sessions',
@@ -86,12 +87,13 @@ Rails.application.routes.draw do
 
   # Remote follow
   resource :authorize_follow, only: [:show, :create]
+  resource :share, only: [:show, :create]
 
   namespace :admin do
     resources :subscriptions, only: [:index]
     resources :domain_blocks, only: [:index, :new, :create, :show, :destroy]
     resource :settings, only: [:edit, :update]
-    
+
     resources :instances, only: [:index] do
       collection do
         post :resubscribe