jiti-meet/modules/API/external/external_api.js

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2016-11-11 15:00:54 +00:00
const logger = require("jitsi-meet-logger").getLogger(__filename);
/**
* Implements API class that embeds Jitsi Meet in external applications.
*/
var postisInit = require("postis");
/**
* The minimum width for the Jitsi Meet frame
* @type {number}
*/
var MIN_WIDTH = 790;
/**
* The minimum height for the Jitsi Meet frame
* @type {number}
*/
var MIN_HEIGHT = 300;
/**
* Last id of api object
* @type {number}
*/
var id = 0;
/**
* Maps the names of the commands expected by the API with the name of the
* commands expected by jitsi-meet
*/
var commands = {
"displayName": "display-name",
"toggleAudio": "toggle-audio",
"toggleVideo": "toggle-video",
"toggleFilmStrip": "toggle-film-strip",
"toggleChat": "toggle-chat",
"toggleContactList": "toggle-contact-list",
"toggleShareScreen": "toggle-share-screen",
"hangup": "video-hangup",
"email": "email",
"avatarUrl": "avatar-url"
};
/**
* Maps the names of the events expected by the API with the name of the
* events expected by jitsi-meet
*/
var events = {
"incomingMessage": "incoming-message",
"outgoingMessage": "outgoing-message",
"displayNameChange": "display-name-change",
"participantJoined": "participant-joined",
"participantLeft": "participant-left",
"videoConferenceJoined": "video-conference-joined",
"videoConferenceLeft": "video-conference-left",
"readyToClose": "video-ready-to-close"
};
/**
* Sends the passed object to Jitsi Meet
* @param postis {Postis object} the postis instance that is going to be used
* to send the message
* @param object the object to be sent
* - method {sting}
* - params {object}
*/
function sendMessage(postis, object) {
postis.send(object);
}
/**
* Adds given number to the numberOfParticipants property of given APIInstance.
* @param {JitsiMeetExternalAPI} APIInstance the instance of the
* JitsiMeetExternalAPI
* @param {int} number - the number of participants to be added to
* numberOfParticipants property (this parameter can be negative number if the
* numberOfParticipants should be decreased).
*/
function changeParticipantNumber(APIInstance, number) {
APIInstance.numberOfParticipants += number;
}
/**
* Generates array with URL params based on the passed config object that will
* be used for the Jitsi Meet URL generation.
*
* @param config {object} the config object.
* @returns {Array<string>} the array with URL param strings.
*/
function configToURLParamsArray(config) {
const params = [];
for (const key in config) {
try {
params.push(key + '='
+ encodeURIComponent(JSON.stringify(config[key])));
} catch (e) {
console.warn(`Error encoding ${key}: ${e}`);
}
}
return params;
}
/**
* Constructs new API instance. Creates iframe element that loads
* Jitsi Meet.
* @param domain the domain name of the server that hosts the conference
* @param room_name the name of the room to join
* @param width width of the iframe
* @param height height of the iframe
* @param parent_node the node that will contain the iframe
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* @param configOverwrite object containing configuration options defined in
* config.js to be overridden.
* @param interfaceConfigOverwrite object containing configuration options
* defined in interface_config.js to be overridden.
* @param noSsl if the value is true https won't be used
* @param {string} [jwt] the JWT token if needed by jitsi-meet for
* authentication.
* @constructor
*/
function JitsiMeetExternalAPI(domain, room_name, width, height, parentNode,
configOverwrite, interfaceConfigOverwrite, noSsl, jwt) {
if (!width || width < MIN_WIDTH)
width = MIN_WIDTH;
if (!height || height < MIN_HEIGHT)
height = MIN_HEIGHT;
this.parentNode = null;
if (parentNode) {
this.parentNode = parentNode;
} else {
var scriptTag = document.scripts[document.scripts.length - 1];
this.parentNode = scriptTag.parentNode;
}
this.iframeHolder =
this.parentNode.appendChild(document.createElement("div"));
this.iframeHolder.id = "jitsiConference" + id;
if(width)
this.iframeHolder.style.width = width + "px";
if(height)
this.iframeHolder.style.height = height + "px";
this.frameName = "jitsiConferenceFrame" + id;
this.url = (noSsl) ? "http" : "https" +"://" + domain + "/";
if(room_name)
this.url += room_name;
if (jwt) {
this.url += '?jwt=' + jwt;
}
this.url += "#jitsi_meet_external_api_id=" + id;
const configURLParams = configToURLParamsArray(configOverwrite);
if (configURLParams.length) {
this.url += '&config.' + configURLParams.join('&config.');
}
const interfaceConfigURLParams
= configToURLParamsArray(interfaceConfigOverwrite);
if (interfaceConfigURLParams.length) {
this.url += '&interfaceConfig.'
+ interfaceConfigURLParams.join('&interfaceConfig.');
}
this.frame = document.createElement("iframe");
this.frame.src = this.url;
this.frame.name = this.frameName;
this.frame.id = this.frameName;
this.frame.width = "100%";
this.frame.height = "100%";
this.frame.setAttribute("allowFullScreen","true");
this.frame = this.iframeHolder.appendChild(this.frame);
this.postis = postisInit({
window: this.frame.contentWindow,
scope: "jitsi_meet_external_api_" + id
});
this.eventHandlers = {};
// Map<{string} event_name, {boolean} postis_listener_added>
this.postisListeners = {};
this.numberOfParticipants = 1;
this._setupListeners();
id++;
}
/**
* Executes command. The available commands are:
* displayName - sets the display name of the local participant to the value
* passed in the arguments array.
* toggleAudio - mutes / unmutes audio with no arguments
* toggleVideo - mutes / unmutes video with no arguments
* filmStrip - hides / shows the film strip with no arguments
* If the command doesn't require any arguments the parameter should be set
* to empty array or it may be omitted.
* @param name the name of the command
* @param arguments array of arguments
*/
JitsiMeetExternalAPI.prototype.executeCommand
= function(name, ...argumentsList) {
if(!(name in commands)) {
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logger.error("Not supported command name.");
return;
}
sendMessage(this.postis, {method: commands[name], params: argumentsList});
};
/**
* Executes commands. The available commands are:
* displayName - sets the display name of the local participant to the value
* passed in the arguments array.
* toggleAudio - mutes / unmutes audio. no arguments
* toggleVideo - mutes / unmutes video. no arguments
* filmStrip - hides / shows the film strip. no arguments
* toggleChat - hides / shows chat. no arguments.
* toggleContactList - hides / shows contact list. no arguments.
* toggleShareScreen - starts / stops screen sharing. no arguments.
* @param object the object with commands to be executed. The keys of the
* object are the commands that will be executed and the values are the
* arguments for the command.
*/
JitsiMeetExternalAPI.prototype.executeCommands = function(object) {
for(var key in object)
this.executeCommand(key, object[key]);
};
/**
* Adds event listeners to Meet Jitsi. The object key should be the name of
* the event and value - the listener.
* Currently we support the following
* events:
* incomingMessage - receives event notifications about incoming
* messages. The listener will receive object with the following structure:
* {{
* "from": from,//JID of the user that sent the message
* "nick": nick,//the nickname of the user that sent the message
* "message": txt//the text of the message
* }}
* outgoingMessage - receives event notifications about outgoing
* messages. The listener will receive object with the following structure:
* {{
* "message": txt//the text of the message
* }}
* displayNameChanged - receives event notifications about display name
* change. The listener will receive object with the following structure:
* {{
* jid: jid,//the JID of the participant that changed his display name
* displayname: displayName //the new display name
* }}
* participantJoined - receives event notifications about new participant.
* The listener will receive object with the following structure:
* {{
* jid: jid //the jid of the participant
* }}
* participantLeft - receives event notifications about the participant that
* left the room.
* The listener will receive object with the following structure:
* {{
* jid: jid //the jid of the participant
* }}
* video-conference-joined - receives event notifications about the local user
* has successfully joined the video conference.
* The listener will receive object with the following structure:
* {{
* roomName: room //the room name of the conference
* }}
* video-conference-left - receives event notifications about the local user
* has left the video conference.
* The listener will receive object with the following structure:
* {{
* roomName: room //the room name of the conference
* }}
* readyToClose - all hangup operations are completed and Jitsi Meet is ready
* to be disposed.
* @param object
*/
JitsiMeetExternalAPI.prototype.addEventListeners = function(object) {
for(var i in object)
this.addEventListener(i, object[i]);
};
/**
* Adds event listeners to Meet Jitsi. Currently we support the following
* events:
* incomingMessage - receives event notifications about incoming
* messages. The listener will receive object with the following structure:
* {{
* "from": from,//JID of the user that sent the message
* "nick": nick,//the nickname of the user that sent the message
* "message": txt//the text of the message
* }}
* outgoingMessage - receives event notifications about outgoing
* messages. The listener will receive object with the following structure:
* {{
* "message": txt//the text of the message
* }}
* displayNameChanged - receives event notifications about display name
* change. The listener will receive object with the following structure:
* {{
* jid: jid,//the JID of the participant that changed his display name
* displayname: displayName //the new display name
* }}
* participantJoined - receives event notifications about new participant.
* The listener will receive object with the following structure:
* {{
* jid: jid //the jid of the participant
* }}
* participantLeft - receives event notifications about participant the that
* left the room.
* The listener will receive object with the following structure:
* {{
* jid: jid //the jid of the participant
* }}
* video-conference-joined - receives event notifications fired when the local
* user has joined the video conference.
* The listener will receive object with the following structure:
* {{
* roomName: room //the room name of the conference
* }}
* video-conference-left - receives event notifications fired when the local
* user has joined the video conference.
* The listener will receive object with the following structure:
* {{
* roomName: room //the room name of the conference
* }}
* @param event the name of the event
* @param listener the listener
*/
JitsiMeetExternalAPI.prototype.addEventListener = function(event, listener) {
if(!(event in events)) {
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logger.error("Not supported event name.");
return;
}
// We cannot remove listeners from postis that's why we are handling the
// callback that way.
if(!this.postisListeners[event]) {
this.postis.listen(events[event], function(data) {
if((event in this.eventHandlers) &&
typeof this.eventHandlers[event] === "function")
this.eventHandlers[event].call(null, data);
}.bind(this));
this.postisListeners[event] = true;
}
this.eventHandlers[event] = listener;
};
/**
* Removes event listener.
* @param event the name of the event.
*/
JitsiMeetExternalAPI.prototype.removeEventListener = function(event) {
if(!(event in this.eventHandlers))
{
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logger.error("The event " + event + " is not registered.");
return;
}
delete this.eventHandlers[event];
};
/**
* Removes event listeners.
* @param events array with the names of the events.
*/
JitsiMeetExternalAPI.prototype.removeEventListeners = function(events) {
for(var i = 0; i < events.length; i++)
this.removeEventListener(events[i]);
};
/**
* Returns the number of participants in the conference.
* NOTE: the local participant is included.
* @returns {int} the number of participants in the conference.
*/
JitsiMeetExternalAPI.prototype.getNumberOfParticipants = function() {
return this.numberOfParticipants;
};
/**
* Setups listeners that are used internally for JitsiMeetExternalAPI.
*/
JitsiMeetExternalAPI.prototype._setupListeners = function() {
this.postis.listen("participant-joined",
changeParticipantNumber.bind(null, this, 1));
this.postis.listen("participant-left",
changeParticipantNumber.bind(null, this, -1));
};
/**
* Removes the listeners and removes the Jitsi Meet frame.
*/
JitsiMeetExternalAPI.prototype.dispose = function() {
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this.postis.destroy();
var frame = document.getElementById(this.frameName);
if(frame)
frame.src = 'about:blank';
var self = this;
window.setTimeout(function () {
self.iframeHolder.removeChild(self.frame);
self.iframeHolder.parentNode.removeChild(self.iframeHolder);
}, 10);
};
module.exports = JitsiMeetExternalAPI;