react-native-vk-webview-bridge/webview-bridge/index.android.js

React Native WebView Javascript Bridge

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule WebViewBridge
 */
'use strict';


var React = require('react');
var ReactNative = require('react-native');
var EdgeInsetsPropType = ReactNative.EdgeInsetsPropType;
var ActivityIndicator = ReactNative.ActivityIndicator;
var StyleSheet = ReactNative.StyleSheet;
var UIManager = ReactNative.UIManager;
var View = ReactNative.View;

var requireNativeComponent = ReactNative.requireNativeComponent;
var resolveAssetSource = require('react-native/Libraries/Image/resolveAssetSource');


var keyMirror = require('keymirror');

var PropTypes = React.PropTypes;

var RCT_WEBVIEW_REF = 'webview';

var WebViewState = keyMirror({
    IDLE: null,
    LOADING: null,
    ERROR: null,
});

var defaultRenderLoading = () => (
    <View style={styles.loadingView}>
        <ActivityIndicator
            style={styles.loadingProgressBar}
        />
    </View>
);

/**
 * Renders a native WebView.
 */
class WebViewBridge extends React.Component {
    static propTypes = {
        ...View.propTypes,
        renderError: PropTypes.func,
        renderLoading: PropTypes.func,
        onLoad: PropTypes.func,
        onLoadEnd: PropTypes.func,
        onLoadStart: PropTypes.func,
        onError: PropTypes.func,
        automaticallyAdjustContentInsets: PropTypes.bool,
        contentInset: EdgeInsetsPropType,
        onNavigationStateChange: PropTypes.func,
        onBridgeMessage: PropTypes.func,
        onContentSizeChange: PropTypes.func,
        startInLoadingState: PropTypes.bool, // force WebView to show loadingView on first load
        style: View.propTypes.style,

        html: PropTypes.string,

        url: PropTypes.string,

        /**
         * Loads static html or a uri (with optional headers) in the WebView.
         */
        source: PropTypes.oneOfType([
            PropTypes.shape({
                /*
                 * The URI to load in the WebView. Can be a local or remote file.
                 */
                uri: PropTypes.string,
                /*
                 * The HTTP Method to use. Defaults to GET if not specified.
                 * NOTE: On Android, only GET and POST are supported.
                 */
                method: PropTypes.oneOf(['GET', 'POST']),
                /*
                 * Additional HTTP headers to send with the request.
                 * NOTE: On Android, this can only be used with GET requests.
                 */
                headers: PropTypes.object,
                /*
                 * The HTTP body to send with the request. This must be a valid
                 * UTF-8 string, and will be sent exactly as specified, with no
                 * additional encoding (e.g. URL-escaping or base64) applied.
                 * NOTE: On Android, this can only be used with POST requests.
                 */
                body: PropTypes.string,
            }),
            PropTypes.shape({
                /*
                 * A static HTML page to display in the WebView.
                 */
                html: PropTypes.string,
                /*
                 * The base URL to be used for any relative links in the HTML.
                 */
                baseUrl: PropTypes.string,
            }),
            /*
             * Used internally by packager.
             */
            PropTypes.number,
        ]),

        /**
         * Used on Android only, JS is enabled by default for WebView on iOS
         * @platform android
         */
        javaScriptEnabled: PropTypes.bool,

        /**
         * Used on Android only, controls whether DOM Storage is enabled or not
         * @platform android
         */
        domStorageEnabled: PropTypes.bool,

        /**
         * Sets the JS to be injected when the webpage loads.
         */
        injectedJavaScript: PropTypes.string,

        /**
         * Sets whether the webpage scales to fit the view and the user can change the scale.
         */
        scalesPageToFit: PropTypes.bool,

        /**
         * Sets the user-agent for this WebView. The user-agent can also be set in native using
         * WebViewConfig. This prop will overwrite that config.
         */
        userAgent: PropTypes.string,

        /**
         * Used to locate this view in end-to-end tests.
         */
        testID: PropTypes.string,

        /**
         * Determines whether HTML5 audio & videos require the user to tap before they can
         * start playing. The default value is `false`.
         */
        mediaPlaybackRequiresUserAction: PropTypes.bool,

        allowFileAccessFromFileURLs: PropTypes.bool,
        allowUniversalAccessFromFileURLs: PropTypes.bool,

        shouldOverrideUrlLoadingVal: PropTypes.bool,
        scrollEnabled: PropTypes.bool,

        onShouldStartLoadWithRequest: PropTypes.func,
    };

    static defaultProps = {
        javaScriptEnabled : true,
        scalesPageToFit: true,
        shouldOverrideUrlLoadingVal: true,
        scrollEnabled: true,
    };

    state = {
        viewState: WebViewState.IDLE,
        lastErrorEvent: null,
        startInLoadingState: true,
    };

    componentWillMount() {
        if (this.props.startInLoadingState) {
            this.setState({viewState: WebViewState.LOADING});
        }
    }

    render() {
        var otherView = null;

        if (this.state.viewState === WebViewState.LOADING) {
            otherView = (this.props.renderLoading || defaultRenderLoading)();
        } else if (this.state.viewState === WebViewState.ERROR) {
            var errorEvent = this.state.lastErrorEvent;
            otherView = this.props.renderError && this.props.renderError(
                    errorEvent.domain,
                    errorEvent.code,
                    errorEvent.description);
        } else if (this.state.viewState !== WebViewState.IDLE) {
            console.error('RCTWebViewBridge invalid state encountered: ' + this.state.loading);
        }

        var webViewStyles = [styles.container, this.props.style];
        if (this.state.viewState === WebViewState.LOADING ||
            this.state.viewState === WebViewState.ERROR) {
            // if we're in either LOADING or ERROR states, don't show the webView
            webViewStyles.push(styles.hidden);
        }

        var source = this.props.source || {};
        if (this.props.html) {
            source.html = this.props.html;
        } else if (this.props.url) {
            source.uri = this.props.url;
        }

        if (source.method === 'POST' && source.headers) {
            console.warn('WebView: `source.headers` is not supported when using POST.');
        } else if (source.method === 'GET' && source.body) {
            console.warn('WebView: `source.body` is not supported when using GET.');
        }

        var onShouldStartLoadWithRequest = this.props.onShouldStartLoadWithRequest && ((event: Event) => {
                var shouldStart = this.props.onShouldStartLoadWithRequest &&
                    this.props.onShouldStartLoadWithRequest(event.nativeEvent);
                // RCTWebViewBridgeManager.startLoadWithResult(!!shouldStart, event.nativeEvent.lockIdentifier);
            });

        var webView =
            <RCTWebViewBridge
                ref={RCT_WEBVIEW_REF}
                key="webViewKey"
                style={webViewStyles}
                source={resolveAssetSource(source)}
                scalesPageToFit={this.props.scalesPageToFit}
                injectedJavaScript={this.props.injectedJavaScript}
                userAgent={this.props.userAgent}
                javaScriptEnabled={this.props.javaScriptEnabled}
                domStorageEnabled={this.props.domStorageEnabled}
                messagingEnabled={typeof this.props.onBridgeMessage === 'function'}
                onMessage={this.onMessage}
                contentInset={this.props.contentInset}
                automaticallyAdjustContentInsets={this.props.automaticallyAdjustContentInsets}
                onContentSizeChange={this.props.onContentSizeChange}
                onLoadingStart={this.onLoadingStart}
                onLoadingFinish={this.onLoadingFinish}
                onLoadingError={this.onLoadingError}
                testID={this.props.testID}
                mediaPlaybackRequiresUserAction={this.props.mediaPlaybackRequiresUserAction}

                allowFileAccessFromFileURLs={this.props.allowFileAccessFromFileURLs}
                allowUniversalAccessFromFileURLs={this.props.allowUniversalAccessFromFileURLs}

                onShouldStartLoadWithRequest={onShouldStartLoadWithRequest}

                shouldOverrideUrlLoadingVal={this.props.shouldOverrideUrlLoadingVal}

                scrollEnabled={this.props.scrollEnabled}
            />;

        return (
            <View style={styles.container}>
                {webView}
                {otherView}
            </View>
        );
    }

    goForward = () => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.goForward,
            null
        );
    };

    goBack = () => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.goBack,
            null
        );
    };

    reload = () => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.reload,
            null
        );
    };

    stopLoading = () => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.stopLoading,
            null
        );
    };

    sendToBridge = (data) => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.postMessage,
            [String(data)]
        );
    };

    postMessage = (data) => {
        UIManager.dispatchViewManagerCommand(
            this.getWebViewHandle(),
            UIManager.RCTWebViewBridge.Commands.postMessage,
            [String(data)]
        );
    };

    /**
     * We return an event with a bunch of fields including:
     *  url, title, loading, canGoBack, canGoForward
     */
    updateNavigationState = (event) => {
        if (this.props.onNavigationStateChange) {
            this.props.onNavigationStateChange(event.nativeEvent);
        }
    };

    getWebViewHandle = () => {
        return ReactNative.findNodeHandle(this.refs[RCT_WEBVIEW_REF]);
    };

    onLoadingStart = (event) => {
        var onLoadStart = this.props.onLoadStart;
        onLoadStart && onLoadStart(event);
        this.updateNavigationState(event);
    };

    onLoadingError = (event) => {
        event.persist(); // persist this event because we need to store it
        var {onError, onLoadEnd} = this.props;
        onError && onError(event);
        onLoadEnd && onLoadEnd(event);
        console.warn('Encountered an error loading page', event.nativeEvent);

        this.setState({
            lastErrorEvent: event.nativeEvent,
            viewState: WebViewState.ERROR
        });
    };

    onLoadingFinish = (event) => {
        var {onLoad, onLoadEnd} = this.props;
        onLoad && onLoad(event);
        onLoadEnd && onLoadEnd(event);
        this.setState({
            viewState: WebViewState.IDLE,
        });
        this.updateNavigationState(event);
    };

    onMessage = (event: Event) => {
        const message = event.nativeEvent.data;
        if(message.startsWith("onShouldStartLoadWithRequest::")){
            let msg = message.replace(/onShouldStartLoadWithRequest::/g, "")
            let event = {
                url:msg
            }
            this.props.onShouldStartLoadWithRequest && this.props.onShouldStartLoadWithRequest(event);
            return;
        }
        // special for
        const onBridgeMessageCallback = this.props.onBridgeMessage;
        if (onBridgeMessageCallback) {
            onBridgeMessageCallback(message);
        }
    }
}

var RCTWebViewBridge = requireNativeComponent('RCTWebViewBridge', WebViewBridge, {
    nativeOnly: {
        messagingEnabled: PropTypes.bool,
        shouldOverrideUrlLoadingVal: PropTypes.bool,
        scrollEnabled:PropTypes.bool,
    },
});

var styles = StyleSheet.create({
    container: {
        flex: 1,
    },
    hidden: {
        height: 0,
        flex: 0, // disable 'flex:1' when hiding a View
    },
    loadingView: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
    },
    loadingProgressBar: {
        height: 20,
    },
});

module.exports = WebViewBridge;