rn: add shared document support using Etherpad

lang/main.json

     "dialOut": {
         "statusMessage": "is now {{status}}"
     },
+    "documentSharing" : {
+        "title": "Shared Document"
+    },
     "feedback": {
         "average": "Average",
         "bad": "Bad",

react/features/conference/components/native/Conference.js

 import { ConferenceNotification, isCalendarEnabled } from '../../../calendar-sync';
 import { Chat } from '../../../chat';
 import { DisplayNameLabel } from '../../../display-name';
+import { SharedDocument } from '../../../etherpad';
 import {
     FILMSTRIP_SIZE,
     Filmstrip,
                     hidden = { true }
                     translucent = { true } />
 
-                <Chat />
                 <AddPeopleDialog />
+                <Chat />
+                <SharedDocument />
 
                 {/*
                   * The LargeVideo is the lowermost stacking layer.

react/features/etherpad/actionTypes.js

  *     type: SET_DOCUMENT_EDITING_STATUS
  * }
  */
-export const SET_DOCUMENT_EDITING_STATUS
-    = 'SET_DOCUMENT_EDITING_STATUS';
+export const SET_DOCUMENT_EDITING_STATUS = 'SET_DOCUMENT_EDITING_STATUS';
+
+/**
+ * The type of the action which updates the shared document URL.
+ *
+ * {
+ *     type: SET_DOCUMENT_URL
+ * }
+ */
+export const SET_DOCUMENT_URL = 'SET_DOCUMENT_URL';
 
 /**
  * The type of the action which signals to start or stop editing a shared

react/features/etherpad/actions.js

 import {
     ETHERPAD_INITIALIZED,
     SET_DOCUMENT_EDITING_STATUS,
+    SET_DOCUMENT_URL,
     TOGGLE_DOCUMENT_EDITING
 } from './actionTypes';
 
     };
 }
 
+/**
+ * Dispatches an action to set the shared document URL.
+ *
+ * @param {string} documentUrl - The shared document URL.
+ * @returns {{
+ *    type: SET_DOCUMENT_URL,
+ *    documentUrl: string
+ * }}
+ */
+export function setDocumentUrl(documentUrl: ?string) {
+    return {
+        type: SET_DOCUMENT_URL,
+        documentUrl
+    };
+}
+
 /**
  * Dispatches an action to set Etherpad as having been initialized.
  *

react/features/etherpad/components/SharedDocumentButton.js

+// @flow
+
+import type { Dispatch } from 'redux';
+
+import { createToolbarEvent, sendAnalytics } from '../../analytics';
+import { translate } from '../../base/i18n';
+import { IconShareDoc } from '../../base/icons';
+import { connect } from '../../base/redux';
+import { AbstractButton, type AbstractButtonProps } from '../../base/toolbox';
+
+import { toggleDocument } from '../actions';
+
+
+type Props = AbstractButtonProps & {
+
+    /**
+     * Whether the shared document is being edited or not.
+     */
+    _editing: boolean,
+
+    /**
+     * Redux dispatch function.
+     */
+    dispatch: Dispatch<any>,
+};
+
+/**
+ * Implements an {@link AbstractButton} to open the chat screen on mobile.
+ */
+class SharedDocumentButton extends AbstractButton<Props, *> {
+    accessibilityLabel = 'toolbar.accessibilityLabel.document';
+    icon = IconShareDoc;
+    label = 'toolbar.documentOpen';
+    toggledLabel = 'toolbar.documentClose';
+
+    /**
+     * Handles clicking / pressing the button, and opens / closes the appropriate dialog.
+     *
+     * @private
+     * @returns {void}
+     */
+    _handleClick() {
+        sendAnalytics(createToolbarEvent(
+            'toggle.etherpad',
+            {
+                enable: !this.props._editing
+            }));
+        this.props.dispatch(toggleDocument());
+    }
+
+    /**
+     * Indicates whether this button is in toggled state or not.
+     *
+     * @override
+     * @protected
+     * @returns {boolean}
+     */
+    _isToggled() {
+        return this.props._editing;
+    }
+}
+
+/**
+ * Maps part of the redux state to the component's props.
+ *
+ * @param {Object} state - The redux store/state.
+ * @param {Object} ownProps - The properties explicitly passed to the component
+ * instance.
+ * @returns {Object}
+ */
+function _mapStateToProps(state: Object, ownProps: Object) {
+    const { documentUrl, editing } = state['features/etherpad'];
+    const { visible = Boolean(documentUrl) } = ownProps;
+
+    return {
+        _editing: editing,
+        visible
+    };
+}
+
+export default translate(connect(_mapStateToProps)(SharedDocumentButton));

react/features/etherpad/components/index.native.js

+export { default as SharedDocument } from './native/SharedDocument';
+export { default as SharedDocumentButton } from './SharedDocumentButton';

react/features/etherpad/components/index.web.js

+export { default as SharedDocumentButton } from './SharedDocumentButton';

react/features/etherpad/components/native/SharedDocument.js

+// @flow
+
+import React, { PureComponent } from 'react';
+import { SafeAreaView, View } from 'react-native';
+import { WebView } from 'react-native-webview';
+import type { Dispatch } from 'redux';
+
+import { ColorSchemeRegistry } from '../../../base/color-scheme';
+import { translate } from '../../../base/i18n';
+import { HeaderWithNavigation, LoadingIndicator, SlidingView } from '../../../base/react';
+import { connect } from '../../../base/redux';
+
+import { toggleDocument } from '../../actions';
+import { getSharedDocumentUrl } from '../../functions';
+
+import styles, { INDICATOR_COLOR } from './styles';
+
+/**
+ * The type of the React {@code Component} props of {@code ShareDocument}.
+ */
+type Props = {
+
+    /**
+     * URL for the shared document.
+     */
+    _documentUrl: string,
+
+    /**
+     * Color schemed style of the header component.
+     */
+    _headerStyles: Object,
+
+    /**
+     * True if the chat window should be rendered.
+     */
+    _isOpen: boolean,
+
+    /**
+     * The Redux dispatch function.
+     */
+    dispatch: Dispatch<any>,
+
+    /**
+     * Function to be used to translate i18n labels.
+     */
+    t: Function
+};
+
+/**
+ * Implements a React native component that renders the shared document window.
+ */
+class SharedDocument extends PureComponent<Props> {
+    /**
+     * Instantiates a new instance.
+     *
+     * @inheritdoc
+     */
+    constructor(props: Props) {
+        super(props);
+
+        this._onClose = this._onClose.bind(this);
+        this._onError = this._onError.bind(this);
+        this._renderLoading = this._renderLoading.bind(this);
+    }
+
+    /**
+     * Implements React's {@link Component#render()}.
+     *
+     * @inheritdoc
+     */
+    render() {
+        const { _documentUrl, _isOpen } = this.props;
+        const webViewStyles = this._getWebViewStyles();
+
+        return (
+            <SlidingView
+                onHide = { this._onClose }
+                position = 'bottom'
+                show = { _isOpen } >
+                <View style = { styles.webViewWrapper }>
+                    <HeaderWithNavigation
+                        headerLabelKey = 'documentSharing.title'
+                        onPressBack = { this._onClose } />
+                    <SafeAreaView style = { webViewStyles }>
+                        <WebView
+                            onError = { this._onError }
+                            renderLoading = { this._renderLoading }
+                            source = {{ uri: _documentUrl }}
+                            startInLoadingState = { true } />
+                    </SafeAreaView>
+                </View>
+            </SlidingView>
+        );
+    }
+
+    /**
+     * Computes the styles required for the WebView component.
+     *
+     * @returns {Object}
+     */
+    _getWebViewStyles() {
+        return {
+            ...styles.webView,
+            backgroundColor: this.props._headerStyles.screenHeader.backgroundColor
+        };
+    }
+
+    _onClose: () => boolean
+
+    /**
+     * Closes the window.
+     *
+     * @returns {boolean}
+     */
+    _onClose() {
+        const { _isOpen, dispatch } = this.props;
+
+        if (_isOpen) {
+            dispatch(toggleDocument());
+
+            return true;
+        }
+
+        return false;
+    }
+
+    _onError: () => void;
+
+    /**
+     * Callback to handle the error if the page fails to load.
+     *
+     * @returns {void}
+     */
+    _onError() {
+        const { _isOpen, dispatch } = this.props;
+
+        if (_isOpen) {
+            dispatch(toggleDocument());
+        }
+    }
+
+    _renderLoading: () => React$Component<any>;
+
+    /**
+     * Renders the loading indicator.
+     *
+     * @returns {React$Component<any>}
+     */
+    _renderLoading() {
+        return (
+            <View style = { styles.indicatorWrapper }>
+                <LoadingIndicator
+                    color = { INDICATOR_COLOR }
+                    size = 'large' />
+            </View>
+        );
+    }
+}
+
+/**
+ * Maps (parts of) the redux state to {@link SharedDocument} React {@code Component} props.
+ *
+ * @param {Object} state - The redux store/state.
+ * @private
+ * @returns {Object}
+ */
+export function _mapStateToProps(state: Object) {
+    const { editing } = state['features/etherpad'];
+    const documentUrl = getSharedDocumentUrl(state);
+
+    return {
+        _documentUrl: documentUrl,
+        _headerStyles: ColorSchemeRegistry.get(state, 'Header'),
+        _isOpen: editing
+    };
+}
+
+export default translate(connect(_mapStateToProps)(SharedDocument));

react/features/etherpad/components/native/styles.js

+// @flow
+
+import { ColorPalette } from '../../../base/styles';
+
+export const INDICATOR_COLOR = ColorPalette.lightGrey;
+
+export default {
+
+    indicatorWrapper: {
+        alignItems: 'center',
+        backgroundColor: ColorPalette.white,
+        height: '100%',
+        justifyContent: 'center'
+    },
+
+    webView: {
+        flex: 1
+    },
+
+    webViewWrapper: {
+        flex: 1,
+        flexDirection: 'column'
+    }
+};

react/features/etherpad/functions.js

+// @flow
+
+import { toState } from '../base/redux';
+
+const ETHERPAD_OPTIONS = {
+    showControls: 'true',
+    showChat: 'false',
+    showLineNumbers: 'true',
+    useMonospaceFont: 'false'
+};
+
+/**
+ * Retrieves the current sahred document URL.
+ *
+ * @param {Function|Object} stateful - The redux store or {@code getState} function.
+ * @returns {?string} - Current shared document URL or undefined.
+ */
+export function getSharedDocumentUrl(stateful: Function | Object) {
+    const state = toState(stateful);
+    const { documentUrl } = state['features/etherpad'];
+    const { displayName } = state['features/base/settings'];
+
+    if (!documentUrl) {
+        return undefined;
+    }
+
+    const params = new URLSearchParams(ETHERPAD_OPTIONS);
+
+    if (displayName) {
+        params.append('userName', displayName);
+    }
+
+    return `${documentUrl}?${params.toString()}`;
+}

react/features/etherpad/index.js

 export * from './actions';
 export * from './actionTypes';
+export * from './components';
+export * from './functions';
 
 import './middleware';
 import './reducer';

react/features/etherpad/middleware.js

 // @flow
 
-import { MiddlewareRegistry } from '../base/redux';
+import { getCurrentConference } from '../base/conference';
+import { MiddlewareRegistry, StateListenerRegistry } from '../base/redux';
 import UIEvents from '../../../service/UI/UIEvents';
 
 import { TOGGLE_DOCUMENT_EDITING } from './actionTypes';
+import { setDocumentEditingState, setDocumentUrl } from './actions';
 
 declare var APP: Object;
 
+const ETHERPAD_COMMAND = 'etherpad';
+
 /**
  * Middleware that captures actions related to collaborative document editing
  * and notifies components not hooked into redux.
  * @returns {Function}
  */
 // eslint-disable-next-line no-unused-vars
-MiddlewareRegistry.register(store => next => action => {
-    if (typeof APP === 'undefined') {
-        return next(action);
-    }
-
+MiddlewareRegistry.register(({ dispatch, getState }) => next => action => {
     switch (action.type) {
-    case TOGGLE_DOCUMENT_EDITING:
-        APP.UI.emitEvent(UIEvents.ETHERPAD_CLICKED);
+    case TOGGLE_DOCUMENT_EDITING: {
+        if (typeof APP === 'undefined') {
+            const { editing } = getState()['features/etherpad'];
+
+            dispatch(setDocumentEditingState(!editing));
+        } else {
+            APP.UI.emitEvent(UIEvents.ETHERPAD_CLICKED);
+        }
         break;
     }
+    }
 
     return next(action);
 });
+
+/**
+ * Set up state change listener to perform maintenance tasks when the conference
+ * is left or failed, e.g. clear messages or close the chat modal if it's left
+ * open.
+ */
+StateListenerRegistry.register(
+    state => getCurrentConference(state),
+    (conference, { dispatch, getState }, previousConference) => {
+        if (conference) {
+            conference.addCommandListener(ETHERPAD_COMMAND,
+                ({ value }) => {
+                    let url;
+                    const { etherpad_base: etherpadBase } = getState()['features/base/config'];
+
+                    if (etherpadBase) {
+                        const u = new URL(value, etherpadBase);
+
+                        url = u.toString();
+                    }
+
+                    dispatch(setDocumentUrl(url));
+                }
+            );
+        }
+
+        if (previousConference) {
+            dispatch(setDocumentUrl(undefined));
+        }
+    });

react/features/etherpad/reducer.js

 
 import {
     ETHERPAD_INITIALIZED,
-    SET_DOCUMENT_EDITING_STATUS
+    SET_DOCUMENT_EDITING_STATUS,
+    SET_DOCUMENT_URL
 } from './actionTypes';
 
 const DEFAULT_STATE = {
 
+    /**
+     * URL for the shared document.
+     */
+    documentUrl: undefined,
+
     /**
      * Whether or not Etherpad is currently open.
      *
                 editing: action.editing
             };
 
+        case SET_DOCUMENT_URL:
+            return {
+                ...state,
+                documentUrl: action.documentUrl
+            };
+
         default:
             return state;
         }

react/features/toolbox/components/native/OverflowMenu.js

 import { CHAT_ENABLED, IOS_RECORDING_ENABLED, getFeatureFlag } from '../../../base/flags';
 import { connect } from '../../../base/redux';
 import { StyleType } from '../../../base/styles';
+import { SharedDocumentButton } from '../../../etherpad';
 import { InfoDialogButton, InviteButton } from '../../../invite';
 import { AudioRouteButton } from '../../../mobile/audio-mode';
 import { LiveStreamButton, RecordButton } from '../../../recording';
                         && <InfoDialogButton { ...buttonProps } />
                 }
                 <RaiseHandButton { ...buttonProps } />
+                <SharedDocumentButton { ...buttonProps } />
             </BottomSheet>
         );
     }