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+import { Platform } from 'react-native';
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+import {
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+ RTCPeerConnection,
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+ RTCSessionDescription
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+} from 'react-native-webrtc';
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+
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+import { POSIX } from '../../react-native';
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+
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+// XXX At the time of this writing extending RTCPeerConnection using ES6 'class'
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+// and 'extends' causes a runtime error related to the attempt to define the
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+// onaddstream property setter. The error mentions that babelHelpers.set is
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+// undefined which appears to be a thing inside React Native's packager. As a
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+// workaround, extend using the pre-ES6 way.
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+
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+/**
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+ * The RTCPeerConnection provided by react-native-webrtc fires onaddstream
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+ * before it remembers remotedescription (and thus makes it available to API
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+ * clients). Because that appears to be a problem for lib-jitsi-meet which has
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+ * been successfully running on Chrome, Firefox, Temasys, etc. for a very long
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+ * time, attempt to meets its expectations (by extending RTCPPeerConnection).
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+ *
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+ * @class
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+ */
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+export default function _RTCPeerConnection(...args) {
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+
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+ /* eslint-disable no-invalid-this */
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+
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+ RTCPeerConnection.apply(this, args);
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+
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+ this.onaddstream = (...args) => // eslint-disable-line no-shadow
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+ (this._onaddstreamQueue
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+ ? this._queueOnaddstream
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+ : this._invokeOnaddstream)
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+ .apply(this, args);
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+
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+ // Shadow RTCPeerConnection's onaddstream but after _RTCPeerConnection has
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+ // assigned to the property in question. Defining the property on
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+ // _RTCPeerConnection's prototype may (or may not, I don't know) work but I
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+ // don't want to try because the following approach appears to work and I
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+ // understand it.
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+ Object.defineProperty(this, 'onaddstream', {
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+ configurable: true,
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+ enumerable: true,
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+ get() {
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+ return this._onaddstream;
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+ },
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+ set(value) {
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+ this._onaddstream = value;
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+ }
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+ });
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+
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+ /* eslint-enable no-invalid-this */
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+}
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+
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+_RTCPeerConnection.prototype = Object.create(RTCPeerConnection.prototype);
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+_RTCPeerConnection.prototype.constructor = _RTCPeerConnection;
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+
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+_RTCPeerConnection.prototype._invokeOnaddstream = function(...args) {
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+ const onaddstream = this._onaddstream;
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+
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+ return onaddstream && onaddstream.apply(this, args);
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+};
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+
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+_RTCPeerConnection.prototype._invokeQueuedOnaddstream = function(q) {
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+ q && q.forEach(args => {
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+ try {
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+ this._invokeOnaddstream(...args);
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+ } catch (e) {
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+ // TODO Determine whether the combination of the standard
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+ // setRemoteDescription and onaddstream results in a similar
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+ // swallowing of errors.
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+ _LOGE(e);
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+ }
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+ });
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+};
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+
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+_RTCPeerConnection.prototype._queueOnaddstream = function(...args) {
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+ this._onaddstreamQueue.push(Array.from(args));
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+};
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+
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+_RTCPeerConnection.prototype.setRemoteDescription = function(
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+ sessionDescription,
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+ successCallback,
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+ errorCallback) {
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+ // If the deprecated callback-based version is used, translate it to the
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+ // Promise-based version.
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+ if (typeof successCallback !== 'undefined'
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+ || typeof errorCallback !== 'undefined') {
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+ // XXX Returning a Promise is not necessary. But I don't see why it'd
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+ // hurt (much).
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+ return (
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+ _RTCPeerConnection.prototype.setRemoteDescription.call(
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+ this,
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+ sessionDescription)
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+ .then(successCallback, errorCallback));
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+ }
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+
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+ return (
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+ _synthesizeIPv6Addresses(sessionDescription)
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+ .catch(reason => {
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+ reason && _LOGE(reason);
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+
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+ return sessionDescription;
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+ })
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+ .then(value => _setRemoteDescription.bind(this)(value)));
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+
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+};
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+
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+/**
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+ * Logs at error level.
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+ *
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+ * @returns {void}
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+ */
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+function _LOGE(...args) {
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+ console && console.error && console.error(...args);
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+}
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+
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+/**
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+ * Adapts react-native-webrtc's {@link RTCPeerConnection#setRemoteDescription}
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+ * implementation which uses the deprecated, callback-based version to the
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+ * <tt>Promise</tt>-based version.
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+ *
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+ * @param {RTCSessionDescription} sessionDescription - The RTCSessionDescription
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+ * which specifies the configuration of the remote end of the connection.
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+ * @returns {Promise}
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+ */
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+function _setRemoteDescription(sessionDescription) {
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+ return new Promise((resolve, reject) => {
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+
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+ /* eslint-disable no-invalid-this */
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+
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+ // Ensure I'm not remembering onaddstream invocations from previous
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+ // setRemoteDescription calls. I shouldn't be but... anyway.
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+ this._onaddstreamQueue = [];
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+
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+ RTCPeerConnection.prototype.setRemoteDescription.call(
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+ this,
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+ sessionDescription,
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+ (...args) => {
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+ let q;
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+
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+ try {
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+ resolve(...args);
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+ } finally {
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+ q = this._onaddstreamQueue;
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+ this._onaddstreamQueue = undefined;
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+ }
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+
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+ this._invokeQueuedOnaddstream(q);
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+ },
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+ (...args) => {
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+ this._onaddstreamQueue = undefined;
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+
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+ reject(...args);
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+ });
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+
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+ /* eslint-enable no-invalid-this */
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+ });
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+}
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+
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+/**
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+ * Synthesize IPv6 addresses on iOS in order to support IPv6 NAT64 networks.
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+ *
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+ * @param {RTCSessionDescription} sdp - The RTCSessionDescription which
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+ * specifies the configuration of the remote end of the connection.
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+ * @returns {Promise}
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+ */
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+function _synthesizeIPv6Addresses(sdp) {
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+ // The synthesis of IPv6 addresses is implemented on iOS only at the time of
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+ // this writing.
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+ if (Platform.OS !== 'ios') {
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+ return Promise.resolve(sdp);
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+ }
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+
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+ return (
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+ new Promise(resolve => resolve(_synthesizeIPv6Addresses0(sdp)))
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+ .then(({ ips, lines }) =>
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+ Promise.all(Array.from(ips.values()))
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+ .then(() => _synthesizeIPv6Addresses1(sdp, ips, lines))
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+ ));
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+}
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+
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+/* eslint-disable max-depth */
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+
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+/**
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+ * Implements the initial phase of the synthesis of IPv6 addresses.
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+ *
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+ * @param {RTCSessionDescription} sessionDescription - The RTCSessionDescription
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+ * for which IPv6 addresses will be synthesized.
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+ * @returns {{
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+ * ips: Map,
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+ * lines: Array
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+ * }}
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+ */
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+function _synthesizeIPv6Addresses0(sessionDescription) {
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+ const sdp = sessionDescription.sdp;
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+ let start = 0;
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+ const lines = [];
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+ const ips = new Map();
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+
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+ do {
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+ const end = sdp.indexOf('\r\n', start);
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+ let line;
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+
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+ if (end === -1) {
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+ line = sdp.substring(start);
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+
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+ // Break out of the loop at the end of the iteration.
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+ start = undefined;
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+ } else {
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+ line = sdp.substring(start, end);
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+ start = end + 2;
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+ }
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+
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+ if (line.startsWith('a=candidate:')) {
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+ const candidate = line.split(' ');
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+
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+ if (candidate.length >= 10 && candidate[6] === 'typ') {
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+ const ip4s = [ candidate[4] ];
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+ let abort = false;
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+
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+ for (let i = 8; i < candidate.length; ++i) {
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+ if (candidate[i] === 'raddr') {
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+ ip4s.push(candidate[++i]);
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+ break;
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+ }
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+ }
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+
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+ for (const ip of ip4s) {
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+ if (ip.indexOf(':') === -1) {
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+ ips.has(ip)
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+ || ips.set(ip, new Promise((resolve, reject) => {
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+ const v = ips.get(ip);
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+
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+ if (v && typeof v === 'string') {
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+ resolve(v);
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+ } else {
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+ POSIX.getaddrinfo(ip).then(
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+ value => {
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+ if (value.indexOf(':') === -1
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+ || value === ips.get(ip)) {
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+ ips.delete(ip);
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+ } else {
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+ ips.set(ip, value);
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+ }
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+ resolve(value);
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+ },
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+ reject);
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+ }
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+ }));
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+ } else {
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+ abort = true;
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+ break;
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+ }
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+ }
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+ if (abort) {
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+ ips.clear();
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+ break;
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+ }
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+
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+ line = candidate;
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+ }
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+ }
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+
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+ lines.push(line);
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+ } while (start);
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+
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+ return {
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+ ips,
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+ lines
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+ };
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+}
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+
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+/* eslint-enable max-depth */
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+
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+/**
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+ * Implements the initial phase of the synthesis of IPv6 addresses.
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+ *
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+ * @param {RTCSessionDescription} sessionDescription - The RTCSessionDescription
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+ * for which IPv6 addresses are being synthesized.
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+ * @param {Map} ips - A Map of IPv4 addresses found in the specified
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+ * sessionDescription to synthesized IPv6 addresses.
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+ * @param {Array} lines - The lines of the specified sessionDescription.
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+ * @returns {RTCSessionDescription} A RTCSessionDescription that represents the
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+ * result of the synthesis of IPv6 addresses.
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+ */
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+function _synthesizeIPv6Addresses1(sessionDescription, ips, lines) {
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+ if (ips.size === 0) {
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+ return sessionDescription;
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+ }
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+
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+ for (let l = 0; l < lines.length; ++l) {
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+ const candidate = lines[l];
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+
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+ if (typeof candidate !== 'string') {
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+ let ip4 = candidate[4];
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+ let ip6 = ips.get(ip4);
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+
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+ ip6 && (candidate[4] = ip6);
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+
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+ for (let i = 8; i < candidate.length; ++i) {
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+ if (candidate[i] === 'raddr') {
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+ ip4 = candidate[++i];
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+ (ip6 = ips.get(ip4)) && (candidate[i] = ip6);
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+ break;
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+ }
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+ }
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+
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+ lines[l] = candidate.join(' ');
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+ }
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+ }
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+
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+ return new RTCSessionDescription({
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+ sdp: lines.join('\r\n'),
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+ type: sessionDescription.type
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+ });
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+}
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Lyubomir Marinov
8年前