API

The entrypoint to the library is the sylkrtc object. Several objects (Connection, Account and Call) inherit from Node's EventEmitter class, you may want to check its documentation.

sylkrtc

The main entrypoint to the library. It exposes the main function to connect to SylkServer and some utility functions for general use.

sylkrtc.createConnection(options={})

Creates a sylkrtc connection towards a SylkServer instance. The supported options are "server" and optional object "userAgent". Where server should point to the WebSocket endpoint of the WebRTC gateway application. Example: wss://1.2.3.4:8088/webrtcgateway/ws.

It returns a Connection object.

Example:

let connection = sylkrtc.createConnection({server: 'wss://1.2.3.4:8088/webrtcgateway/ws'});

If the optional userAgent object is given, it should contain:

name : string with the name of the application.
version: version string of the application.

Example with userAgent:

let connection = sylkrtc.createConnection({server: 'wss://1.2.3.4:8088/webrtcgateway/ws', userAgent: {name: 'Some Apllication', version: '0.99.9'}});

sylkrtc.utils

Helper module with utility functions.

attachMediaStream: function to easily attach a media stream to an element. It reexports attachmediastream.
closeMediaStream: function to close the given media stream.
sanatizeHtml: function to XSS sanitize html strings

Connection

Object representing the interaction with SylkServer. Multiple connections can be created with sylkrtc.createConnection, but typically only one is needed. Reconnecting in case the connection is interrupted is taken care of automatically.

Events emitted:

stateChanged: indicates the WebSocket connection state has changed. Two arguments are provided: oldState and newState, the old connection state and the new connection state, respectively. Possible state values are: null, connecting, connected, ready, disconnected and closed. If the connection is involuntarily interrupted the state will transition to disconnected and the connection will be retried. Once the closed state is set, as a result of the user calling Connection.close(), the connection can no longer be used or reconnected.
publicKey: emitted after a publicKey lookup. One argument is provided: the result from the lookup request. This is an object with the following attributes publicKey and uri.

Connection.addAccount(options={}, cb=null)

Configures an Account to be used through sylkrtc. 2 options are required: account (the account ID) and password. An optional displayName can be set. The account won't be registered, it will just be created. Optionally realm can be passed, which will be used instead of the domain for the HA1 calculation.

The password won't be stored or transmitted as given, the HA1 hash (as used in Digest access authentication) is created and used instead.

If you need to extract SIP headers for incoming calls, an option incomingHeaderPrefixes can be set. This should contain an array of string prefixes for the wanted headers.

The cb argument is a callback which will be called with an error and the account object itself.

Example:

connection.addAccount({account: saghul@sip2sip.info, password: 1234}, function(error, account) {
    if (error) {
        console.log('Error adding account!' + account);
    } else {
        console.log('Account added!');
    }
});

Connection.removeAccount(account, cb=null)

Removes the given account. The callback will be called once the operation completes (it cannot fail). The callback will be called with an error object.

Example:

connection.removeAccount(account, function(error) {
    console('Account removed!');
});

Connection.lookupPublicKey(uri)

Lookup the public key of an uri on the server. A publicKey event will be emitted with the lookup result.

Connection.reconnect()

Starts reconnecting immediately if the state was 'disconnected';

Connection.close()

Close the connection with SylkServer. All accounts will be unbound.

Connection.state

Getter property returning the current connection state.

Account

Object representing a SIP account which will be used for making / receiving calls.

Events emitted:

registrationStateChanged: indicates the SIP registration state has changed. Three arguments are provided: oldState, newState and data. oldState and newState represent the old registration state and the new registration state, respectively, and data is a generic per-state data object. Possible states:
- null: registration hasn't started or it has ended
- registering: registration is in progress
- registered
- failed: registration failed, the data object will contain a 'reason' property.
outgoingCall: emitted when an outgoing call is made. A single argument is provided: the Call object.
incomingCall: emitted when an incoming call is received. Two arguments are provided: the Call object and a mediaTypes object, which has 2 boolean properties: audio and video, indicating if those media types were present in the initial SDP.
missedCall: emitted when an incoming call is missed. A data object is provided, which contains an originator attribute, which is an Identity object.
conferenceInvite: emitted when someone invites us to join a conference. A data object is provided, which contains an originator attribute indicating who invited us, and a room attribute indicating what conference we have been invited to.
incomingMessage: emitted when a message is received. A single argument is provided: the Message object.
messageStateChanged: emitted when a message state has changed. Three arguments are provided, 'id', 'state' and a data object. The data object contains a reason and code.
sendingMessage: emitted when sending a message. A single argument is provided which is the message object which is sent.
sendingDispositionNotification: emitted when sending a disposition notification. Multiple arguments are provided. The id, state and error. The error can be null
syncConversations: emitted when the syncConversations function has results. A single argument is provided: a list of Message objects. Each Message has same fields as a normal message. There are some 'special' content types, they are used for replication events:
- message/imdn: content will contain the message_id, message_timestamp and state for the disposition change.
- application/sylk-message-remove: content will contain the contact and message_id fields for the message that needs to be removed.
- application/sylk-conversation-read: content will contain the uri of the contact for whom all messages should be set to displayed
- application/sylk-conversation-remove: content will contain the uri of the contact that needs to be removed.

Events emitted for message synchronisation between devices with the same account:

outgoingMessage: emitted when a different device sends a message to a contact. The argument will be a message object. Please note that a sendingMessage event is also emitted.
removeMessage: emitted when a different device removes a message. The argument will be a message object.
readConversation: emitted when a different device marks a conversation as read. The argument is the contact for the conversation
removeConversation: emitted when a different device removes a conversation. The argument is the contact for which the conversation needs to be removed.

Account.register()

Start the SIP registration process for the account. Progress will be reported via the registrationStateChanged event.

Note: it's not necessary to be registered to make an outgoing call.

Account.unregister()

Unregister the account. Progress will be reported via the registrationStateChanged event.

Account.call(uri, options={})

Start an outgoing call. Supported options:

pcConfig: configuration options for RTCPeerConnection. Reference.
offerOptions: RTCOfferOptions. Reference.
localStream: user provided local media stream (acquired with getUserMedia TODO).
headers: custom headers to include in the INVITE. It should be an array of objects with a name and value key.

Example:

const call = account.call('3333@sip2sip.info', {localStream: stream});

Account.joinConference(uri, options={})

Join (or create in case it doesn't exist) a multi-party video conference at the given URI. Supported options:

pcConfig: configuration options for RTCPeerConnection. Reference.
offerOptions: RTCOfferOptions. Reference.
localStream: user provided local media stream (acquired with getUserMedia TODO).
audio: optional boolean parameter to tell the server it should support audio. Note: this is only used if you are creating the conference.
video: optional boolean parameter to tell the server it should support video. Note: this is only used if you are creating the conference.

Example:

const conf = account.joinConference('test123@conference.sip2sip.info', {localStream: stream});

Account.id

Getter property returning the account ID.

Account.displayName

Getter property returning the account display name.

Account.password

Getter property returning the HA1 password for the account.

Account.registrationState

Getter property returning the current registration state.

Account.incomingHeaderPrefixes

Getter property returning the value of incomingHeaderPrefixes.

Account.messages WIP

Getter property returning the messages.

Account.setDeviceToken(token, platform, device, silent, app)

Set the current device token for this account. The device token is an opaque string usually provided by the Firebase SDK which SylkServer will inject with the other parameters as parameters into to contact header when a SIP account is registered. The parameter silent must be a boolean and all other parameters should be strings.

Account.sendMessage(uri, message, type, options={}, cb=null) WIP

Send a message to (SIP) uri. The message will be send with IMDN enabled. message should contain a string, type should contain the message content type like 'text/plain', 'text/html', 'image/png'. The function returns an instance of Message.

Options can contain a timestamp key with a Date Object. The callback will return with an optional error if the message was sent.

Account.sendDispositionNotification(uri, id, timestamp, state, cb=null) WIP

Send a disposition notification to uri. id should contain the original message id, timestamp should contain the original timestamp, state should contain the IMDN state you want to send. delivered will be sent automatically if the received messages requested positive-delivery disposition.

An optional callback can be given, which will be called with an error if there was one.

Account.syncConversations(id=null, cb=null) WIP

Send a sync conversations request starting from id. The id can contain the last 'messageId received. If the id argument is omitted, all stored 'events' will be returned.

The callback will return with an optional error if the message was sent.

Account.markConversationRead(uri) WIP

Sends a markConversationRead request to the server for uri. It will also mark all messages from uri in the local account as displayed. If you have other devices online, they will get a readConversation event.

Account.removeMessage(message, cb=null) WIP

Removes a message from the (local) account object and server. If you have other devices online, they will get a removeMessage event.

Account.removeConversation(uri, cb=null) WIP

Removes all messages from and to uri from the (local) account object and server. If you have other devices online, they will get a removeConversation event.

Account.checkIfKeyExists(cb=null)

Checks if your public key exists on the server. The callback will be called with the public key as it is stored on the server. Note, it can be null if there is nothing on the server.

Account.addPGPkeys(keys)

Adds your PGP keys. keys should be an object with two attributes: publicKey and privateKey. This will enable message encryption and decription for the account. Messages will be automatically encrypted and decrypted if the remote party is compatible.

Account.generatePGPKeys(cb=null)

Generates a new PGP public/private key pair. The callback will be called with an object with three attributes, publicKey and privateKey and a revocation Certificate. The event privateKeysGenerated will also be emitted with the same object.

Account.decryptKeyImport(message, password, cb=null)

Decrypt a private key message. The function takes a message object, the password and a callback. The callback will be call with the decrypted message and an extra attribute inside the message didDecrypt. If decryption fails it will return with an empty message and didDecrypt will be false. {

Account.exportPrivateKey(password)

Exports the PGP private key to yourself. The key will be encrypted with the supplied password. The message contains the unencrypted public key followed by the encrypted private key.

Account.encryptFile(uri, file)

Encrypt a file with PGP if PGP encryption is supported and returns a Promise object with the result. The object consists of a file and the didEncrypt, which indicates the result.

Account.decryptFile(contents, filename)

Decrypt a string with file contents with PGP if PGP is supported and returns a Promise object with the result. The object consists of a file and the didDecrypt, which indicates the result.

Call

Object representing a audio/video call. Signalling is done using SIP underneath.

Events emitted:

localStreamAdded: emitted when the local stream is added to the call. A single argument is provided: the stream itself.
streamAdded: emitted when a remote stream is added to the call. A single argument is provided: the stream itself.
stateChanged: indicates the call state has changed. Three arguments are provided: oldState, newState and data. oldState and newState indicate the previous and current state respectively, and data is a generic per-state data object. Possible states:
- terminated: the call has ended (the data object contains a reason attribute)
- accepted: the call has been accepted (either locally or remotely)
- incoming: initial state for incoming calls
- progress: initial state for outgoing calls
- early-media: the call has an session description before it is accepted
- established: call media has been established, in case of early media this happens before accepted
dtmfToneSent: emitted when one of the tones passed to sendDtmf is actually sent. An empty tone indicates all tones have finished playing.
incomingMessage: emitted when a message is received. A single argument is provided: the Message object.
messageStateChanged: emitted when a message state has changed. Three arguments are provided, 'id', 'state' and a data object. The data object contains a reason and code.
sendingMessage: emitted when sending a message. A single argument is provided which is the message object which is sent.

Call.answer(options={})

Answer an incoming call. Supported options:

pcConfig: configuration options for RTCPeerConnection. Reference.
answerOptions: RTCAnswerOptions. Reference.
localStream: user provided local media stream (acquired with getUserMedia TODO).

Call.startScreensharing(newTrack)

Start sharing a screen/window. newTrack should be a RTCMediaStreamTrack containing the screen/window. Internally it will call replace track with the keep flag enabled and it will set the state so it can be tracked.

Call.stopScreensharing()

Stop sharing a screen/window and restore the previousTrack.

Call.replaceTrack(oldTrack, newTrack, keep=false, cb=null)

Replace a local track inside a call. If the keep flag is set, it will store the replaced track internally so it can be used later. The callback will be called with a true value once the operation completes.

Call.terminate()

End the call.

Call.getLocalStreams()

Returns an array of local RTCMediaStream objects.

Call.getRemoteStreams()

Returns an array of remote RTCMediaStream objects.

Call.getSenders()

Returns an array of RTCRtpSender objects.

Call.getReceivers()

Returns an array of RTCRtpReceiver objects.

Call.sendDtmf(tones, duration=100, interToneGap=70)

Sends the given DTMF tones over the active audio stream track.

Note: This feature requires browser support for RTCPeerConnection.createDTMFSender.

Call.sendMessage(message, type, options={}, cb=null)

Send a in dialog/in call message to the remote party. message should contain a string, type should contain the message content type like 'text/plain', 'text/html', 'image/png'. The function returns an instance of Message.

Options can contain a timestamp key with a Date Object. The callback will return with an optional error if the message was sent.

Call.account

Getter property which returns the Account object associated with this call.

Call.id

Getter property which returns the ID for this call. Note: this is not related to the SIP Call-ID header.

Call.callId

Getter property which returns the call-id for this call. Note: this is the SIP Call-ID.

Call.sharingScreen

Getter property which returns the screen sharing state.

Call.direction

Getter property which returns the call direction: "incoming" or "outgoing". Note: this is not related to the SDP "a=" direction attribute.

Call.state

Getter property which returns the call state.

Call.localIdentity

Getter property which returns the local identity. (See the Identity object).

Call.remoteIdentity

Getter property which returns the remote identity. (See the Identity object).

Call.remoteMediaDirections

Getter property which returns an object with the directions of the remote streams. Note: this is related to the SDP "a=" direction attribute.

Call.headers

Getter property which returns the custom headers array associated with this call. This will contain the matched headers from the incomingHeaderPrefixes, or the headers set on outgoing calls.

Call.statistics

Getter property which returns a statistics object for the call.

Conference

Object representing a multi-party audio/video conference.

Events emitted:

localStreamAdded: emitted when the local stream is added to the call. A single argument is provided: the stream itself.
stateChanged: indicates the conference state has changed. Three arguments are provided: oldState, newState and data. oldState and newState indicate the previous and current state respectively, and data is a generic per-state data object. Possible states:
- terminated: the conference has ended
- accepted: the initial offer has been accepted
- progress: initial state
- established: conference has been established and media is flowing
participantJoined: emitted when a participant joined the conference. A single argument is provided: an instance of Participant. Note that this event is only emitted when new participants join, Conference.participants should be checked upon the initial join to check what participants are already in the conference.
participantLeft: emitted when a participant leaves the conference. A single argument is provided: an instance of Participant.
roomConfigured: emitted when the room is configured by the server. A single argument is provided: an object with the originator of the message which is an Identity or string and a list of activeParticipants. The list contains instances of Participant.
fileSharing: emitted when a participant in the room shares files. A single argument is provided: a list of instances of SharedFile.
message: emitted when a message is received. A single argument is provided, an instance of Message.
sendingMessage: emitted when a message will be sent. A single argument is provided, an instance of Message.
composingIndication: emitted when somebody in the room is typing. A single argument is provided, an object with refresh, sender and state. The sender is an Identity.
muteAudio: emitted when a Participant requests to muteAudioParticipants.
raisedHands: emitted when a Participant raises or lower his hand. A single argument is provided: a list of raisedHands. The list contains instances of Participant.

Conference.startScreensharing(newTrack)

Start sharing a screen/window. newTrack should be a RTCMediaStreamTrack containing the screen/window. Internally it will call replace track with the keep flag enabled and it will set the state so it can be tracked.

Conference.stopScreensharing()

Stop sharing a screen/window and restore the previousTrack.

Conference.sendMessage(message, type)

Send a chat message to the conference. message should contain a string, type should contain the message content type like 'text/plain', 'text/html', 'image/png'. The function returns an instance of Message.

Conference.sendComposing(state)

Send a composing indication to the conference. state should be either active or idle.

Conference.replaceTrack(oldTrack, newTrack, keep=false, cb=null)

Replace a local track inside the conference. If the keep flag is set, it will store the replaced track internally so it can be used later. The callback will be called with a true value once the operation completes.

Conference.getLocalStreams()

Returns an array of local RTCMediaStream objects. These are the streams being published to the conference.

Conference.getRemoteStreams()

Returns an array of remote RTCMediaStream objects. These are the streams published by all other participants in the conference.

Conference.getSenders()

Returns an array of RTCRtpSender objects. The sender objects get the local tracks being published to the conference.

Conference.getReceivers()

Returns an array of RTCRtpReceiver objects. The receiver objects get the remote tracks published by all other participants in the conference.

Conference.scaleLocalTrack(track, divider)

Scale the given local video track by a given divider. Currently this function will not work, since browser support is lacking.

Conference.configureRoom(participants, cb=null)

Configure the room. Participants is a list with the publisher session ids of the new active participants. The active participants will get more bandwidth and the other participants will get a limited bandwidth. On success the roomConfigured event is emitted.

The cb argument is a callback which will be called on an error with error as argument.

Conference.muteAudioParticipants()

Request muting for all participants. All participants in the room will get a muteAudio event from the server.

Conference.toggleHand(participantSession)

Raise/Lower your hand. An optional participant session can be provided, so the hand of this specific session is raised/lowered. Calling this function will trigger a raisedHands event to all participants in the room.

Conference.participants

Getter property which returns an array of Participant objects in the conference.

Conference.activeParticipants

Getter property for the Active Participants which returns an array of Participant objects in the conference.

Conference.sharedFiles

Getter property for the Shared Files which returns an array of SharedFile objects in the conference.

Conference.messages

Getter property for the Messages which returns an array of Message objects in the conference.

Conference.raisedHands

Getter property for the Raised Hands which returns an array of Participant objects.

Conference.account

Getter property which returns the Account object associated with this conference.

Conference.id

Getter property which returns the ID for this conference. Note: this is not related to the URI.

Conference.sharingScreen

Getter property which returns the screen sharing state.

Conference.direction

Dummy property always returning "outgoing", in order to provide the same API as Call.

Conference.state

Getter property which returns the conference state.

Conference.localIdentity

Getter property which returns the local identity. (See the Identity object). This will always be built from the account.

Conference.remoteIdentity

Getter property which returns the remote identity. (See the Identity object). This will always be built from the remote URI.

Conference.supportsAudio

Getter property which returns if audio relaying/offer is supported by the server.

Conference.supportsVideo

Getter property which returns if video relaying/offer is supported by the server.

Conference.statistics

Getter property which returns a statistics object for the conference.

Participant

Object representing another user connected to the same conference.

Events emitted:

streamAdded: emitted when a remote stream is added. A single argument is provided: the stream itself.
stateChanged: indicates the participant state has changed. Three arguments are provided: oldState, newState and data. oldState and newState indicate the previous and current state respectively, and data is a generic per-state data object. Possible states:
- null: initial state
- progress: the participant is being attached to, this will happen as a result to Participant.attach
- established: media is flowing from this participant

Participant.id

Getter property which returns the ID for this participant. Note this an abstract ID.

Participant.state

Getter property which returns the participant state.

Participant.identity

Getter property which returns the participant's identity. (See the Identity object).

Participant.publisherId

Getter property which returns the participant's publisher session id.

Participant.streams

Getter property which returns the audio / video streams for this participant.

Participant.videoPaused

Getter property which returns true / false when the video subscription is paused / not paused

Participant.getReceivers()

Returns an array of RTCRtpReceiver objects. The receiver objects get the remote tracks published by the participant.

Participant.attach()

Start receiving audio / video from this participant. Once attached the participant's state will switch to 'established' and its audio /video stream(s) will be available in Participant.streams. If a participant is not attached to, no audio or video will be received from them.

Participant.detach(isRemoved=false)

Stop receiving audio / video from this participant. The opposite of Participant.attach(). The isRemoved option needs to be true used when the participant has already left. This is the case when you receive the 'participantLeft' event.

Participant.pauseVideo()

Stop receiving video from this participant. The opposite of Participant.resumeVideo().

Participant.resumeVideo()

Resume receiving video from this participant. The opposite of Participant.pauseVideo().

Identity

Object representing the identity of the caller / callee.

Identity.uri

SIP URI, without the 'sip:' prefix.

Identity.displayName

Display name assiciated with the identity. Set to '' if absent.

Identity.toString()

Function returning a string representation of the identity. It can take 2 forms depending on the availability of the display name: 'bob@biloxi.com' or 'Bob bob@biloxi.com'.

SharedFile

Object representing a shared file.

SharedFile.filename

The filename of the shared file

SharedFile.filesize

The filesize in bytes of the shared file

SharedFile.uploader

The Identity of the uploader.

SharedFile.session

The session UUID which was used to upload the file

Message

Object representing a message.

Events emitted:

stateChanged: indicates the message state has changed. Two arguments are provided: oldState, newState. oldState and newState indicate the previous and current state respectively. Possible states:
- received: the message was received
- pending: the message is pending delivery
- delivered: the message has been delivered, for direct messages it means an IMDN delivered was received
- accepted: only valid in direct messages, the message was accepted for delivery
- displayed: only valid in direct messages, the message was displayed, an IMDN display was received
- failed: something went wrong, either it is not delivered, or it could not be sent

Message.id

Getter property for id the message

Message.content

Getter property for the content of the message. In case content type of the message is 'text/html', it will be sanatized.

Message.contentType

Getter property for the content type of the message.

Message.sender

Getter property for the Identity of the message sender.

Message.receiver

Getter property for the uri of the message receiver.

Message.timestamp

Getter property for the Date object of the message.

Message.type

Getter property for the type of the message, it can be normal or status.

Message.state

Getter property for the state of the message. It can be received, pending, delivered, failed, accepted, displayed.

Message.dispositionState

Getter property for the disposition state of the message. It can be delivered, displayed.

Message.isSecure

Getter property to determine if the message was received encrypted. It will be true when it is.

Message.json

Getter property to determine which contains the parsed content of a filetransfer message. If the content can't be parsed, it is empty and jsonError is set to true.

Message.jsonError

Getter property to indicate if json parsing of the message contents was successfull. It can be true or false.

Statistics

Object used to gather statistics.

Events emitted:

stats: emitted when the statistics are gathered for a peerConnection. The argument is a object containing the statistics. Note that in case of a conference this event happens for each peerConnection present. The object contains the following:
- peerId: the id of the peer connection,
- connectionId: a connectionId,
- data: parsed statistics data object:
```
   audio: {
       inbound: [],
       outbound: []
   },
   video: {
       inbound: [],
       outbound: []
   },
   connection: {
       inbound: [],
       outbound: []
   }
   remote: {
       inbound: [],
       outbound: []
   }
```

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API

sylkrtc

sylkrtc.createConnection(options={})

sylkrtc.utils

Connection

Connection.addAccount(options={}, cb=null)

Connection.removeAccount(account, cb=null)

Connection.lookupPublicKey(uri)

Connection.reconnect()

Connection.close()

Connection.state

Account

Account.register()

Account.unregister()

Account.call(uri, options={})

Account.joinConference(uri, options={})

Account.id

Account.displayName

Account.password

Account.registrationState

Account.incomingHeaderPrefixes

Account.messages WIP

Account.setDeviceToken(token, platform, device, silent, app)

Account.sendMessage(uri, message, type, options={}, cb=null) WIP

Account.sendDispositionNotification(uri, id, timestamp, state, cb=null) WIP

Account.syncConversations(id=null, cb=null) WIP

Account.markConversationRead(uri) WIP

Account.removeMessage(message, cb=null) WIP

Account.removeConversation(uri, cb=null) WIP

Account.checkIfKeyExists(cb=null)

Account.addPGPkeys(keys)

Account.generatePGPKeys(cb=null)

Account.decryptKeyImport(message, password, cb=null)

Account.exportPrivateKey(password)

Account.encryptFile(uri, file)

Account.decryptFile(contents, filename)

Call

Call.answer(options={})

Call.startScreensharing(newTrack)

Call.stopScreensharing()

Call.replaceTrack(oldTrack, newTrack, keep=false, cb=null)

Call.terminate()

Call.getLocalStreams()

Call.getRemoteStreams()

Call.getSenders()

Call.getReceivers()

Call.sendDtmf(tones, duration=100, interToneGap=70)

Call.sendMessage(message, type, options={}, cb=null)

Call.account

Call.id

Call.callId

Call.sharingScreen

Call.direction

Call.state

Call.localIdentity

Call.remoteIdentity

Call.remoteMediaDirections

Call.headers

Call.statistics

Conference

Conference.startScreensharing(newTrack)

Conference.stopScreensharing()

Conference.sendMessage(message, type)

Conference.sendComposing(state)

Conference.replaceTrack(oldTrack, newTrack, keep=false, cb=null)

Conference.getLocalStreams()

Conference.getRemoteStreams()

Conference.getSenders()

Conference.getReceivers()

Conference.scaleLocalTrack(track, divider)

Conference.configureRoom(participants, cb=null)

Conference.muteAudioParticipants()

Conference.toggleHand(participantSession)

Conference.participants