ljm_j1/modules/xmpp/SDP.js

/* global $, APP */

const SDPUtil = require('./SDPUtil');

// SDP STUFF
function SDP(sdp) {
    const media = sdp.split('\r\nm=');
    for (let i = 1, length = media.length; i < length; i++) {
        let media_i = 'm=' + media[i];
        if (i != length - 1) {
            media_i += '\r\n';
        }
        media[i] = media_i;
    }
    const session = media.shift() + '\r\n';

    this.media = media;
    this.raw = session + media.join('');
    this.session = session;
}

/**
 * A flag will make {@link transportToJingle} and {@link jingle2media} replace
 * ICE candidates IPs with invalid value of '1.1.1.1' which will cause ICE
 * failure. The flag is used in the automated testing.
 * @type {boolean}
 */
SDP.prototype.failICE = false;

/**
 * Whether or not to remove TCP ice candidates when translating from/to jingle.
 * @type {boolean}
 */
SDP.prototype.removeTcpCandidates = false;

/**
 * Whether or not to remove UDP ice candidates when translating from/to jingle.
 * @type {boolean}
 */
SDP.prototype.removeUdpCandidates = false;

/**
 * Returns map of MediaChannel mapped per channel idx.
 */
SDP.prototype.getMediaSsrcMap = function() {
    const self = this;
    const media_ssrcs = {};
    let tmp;
    for (let mediaindex = 0; mediaindex < self.media.length; mediaindex++) {
        tmp = SDPUtil.find_lines(self.media[mediaindex], 'a=ssrc:');
        const mid = SDPUtil.parse_mid(SDPUtil.find_line(self.media[mediaindex], 'a=mid:'));
        const media = {
            mediaindex,
            mid,
            ssrcs: {},
            ssrcGroups: []
        };
        media_ssrcs[mediaindex] = media;
        tmp.forEach(function(line) {
            const linessrc = line.substring(7).split(' ')[0];
            // allocate new ChannelSsrc
            if(!media.ssrcs[linessrc]) {
                media.ssrcs[linessrc] = {
                    ssrc: linessrc,
                    lines: []
                };
            }
            media.ssrcs[linessrc].lines.push(line);
        });
        tmp = SDPUtil.find_lines(self.media[mediaindex], 'a=ssrc-group:');
        tmp.forEach(function(line) {
            const idx = line.indexOf(' ');
            const semantics = line.substr(0, idx).substr(13);
            const ssrcs = line.substr(14 + semantics.length).split(' ');
            if (ssrcs.length) {
                media.ssrcGroups.push({
                    semantics,
                    ssrcs
                });
            }
        });
    }
    return media_ssrcs;
};
/**
 * Returns <tt>true</tt> if this SDP contains given SSRC.
 * @param ssrc the ssrc to check.
 * @returns {boolean} <tt>true</tt> if this SDP contains given SSRC.
 */
SDP.prototype.containsSSRC = function(ssrc) {
    // FIXME this code is really strange - improve it if you can
    const medias = this.getMediaSsrcMap();
    let result = false;
    Object.keys(medias).forEach(function(mediaindex) {
        if (result) {
            return;
        }
        if (medias[mediaindex].ssrcs[ssrc]) {
            result = true;
        }
    });
    return result;
};

// remove iSAC and CN from SDP
SDP.prototype.mangle = function() {
    let i, j, lines, mline, newdesc, rtpmap;
    for (i = 0; i < this.media.length; i++) {
        lines = this.media[i].split('\r\n');
        lines.pop(); // remove empty last element
        mline = SDPUtil.parse_mline(lines.shift());
        if (mline.media != 'audio') {
            continue;
        }
        newdesc = '';
        mline.fmt.length = 0;
        for (j = 0; j < lines.length; j++) {
            if (lines[j].substr(0, 9) == 'a=rtpmap:') {
                rtpmap = SDPUtil.parse_rtpmap(lines[j]);
                if (rtpmap.name == 'CN' || rtpmap.name == 'ISAC') {
                    continue;
                }
                mline.fmt.push(rtpmap.id);
            }
            newdesc += lines[j] + '\r\n';
        }
        this.media[i] = SDPUtil.build_mline(mline) + '\r\n' + newdesc;
    }
    this.raw = this.session + this.media.join('');
};

// remove lines matching prefix from session section
SDP.prototype.removeSessionLines = function(prefix) {
    const self = this;
    const lines = SDPUtil.find_lines(this.session, prefix);
    lines.forEach(function(line) {
        self.session = self.session.replace(line + '\r\n', '');
    });
    this.raw = this.session + this.media.join('');
    return lines;
};
// remove lines matching prefix from a media section specified by mediaindex
// TODO: non-numeric mediaindex could match mid
SDP.prototype.removeMediaLines = function(mediaindex, prefix) {
    const self = this;
    const lines = SDPUtil.find_lines(this.media[mediaindex], prefix);
    lines.forEach(function(line) {
        self.media[mediaindex] = self.media[mediaindex].replace(line + '\r\n', '');
    });
    this.raw = this.session + this.media.join('');
    return lines;
};

// add content's to a jingle element
SDP.prototype.toJingle = function(elem, thecreator) {
    let i, j, k, lines, mline, rtpmap, ssrc, tmp;
    // new bundle plan
    lines = SDPUtil.find_lines(this.session, 'a=group:');
    if (lines.length) {
        for (i = 0; i < lines.length; i++) {
            tmp = lines[i].split(' ');
            const semantics = tmp.shift().substr(8);
            elem.c('group', {xmlns: 'urn:xmpp:jingle:apps:grouping:0', semantics});
            for (j = 0; j < tmp.length; j++) {
                elem.c('content', {name: tmp[j]}).up();
            }
            elem.up();
        }
    }
    for (i = 0; i < this.media.length; i++) {
        mline = SDPUtil.parse_mline(this.media[i].split('\r\n')[0]);
        if (!(mline.media === 'audio'
              || mline.media === 'video'
              || mline.media === 'application')) {
            continue;
        }
        const assrcline = SDPUtil.find_line(this.media[i], 'a=ssrc:');
        if (assrcline) {
            ssrc = assrcline.substring(7).split(' ')[0]; // take the first
        } else {
            ssrc = false;
        }

        elem.c('content', {creator: thecreator, name: mline.media});
        const amidline = SDPUtil.find_line(this.media[i], 'a=mid:');
        if (amidline) {
            // prefer identifier from a=mid if present
            const mid = SDPUtil.parse_mid(amidline);
            elem.attrs({ name: mid });
        }

        if (SDPUtil.find_line(this.media[i], 'a=rtpmap:').length) {
            elem.c('description',
                {xmlns: 'urn:xmpp:jingle:apps:rtp:1',
                    media: mline.media });
            if (ssrc) {
                elem.attrs({ssrc});
            }
            for (j = 0; j < mline.fmt.length; j++) {
                rtpmap = SDPUtil.find_line(this.media[i], 'a=rtpmap:' + mline.fmt[j]);
                elem.c('payload-type', SDPUtil.parse_rtpmap(rtpmap));
                // put any 'a=fmtp:' + mline.fmt[j] lines into <param name=foo value=bar/>
                const afmtpline = SDPUtil.find_line(this.media[i], 'a=fmtp:' + mline.fmt[j]);
                if (afmtpline) {
                    tmp = SDPUtil.parse_fmtp(afmtpline);
                    for (k = 0; k < tmp.length; k++) {
                        elem.c('parameter', tmp[k]).up();
                    }
                }
                this.rtcpFbToJingle(i, elem, mline.fmt[j]); // XEP-0293 -- map a=rtcp-fb

                elem.up();
            }
            const crypto = SDPUtil.find_lines(this.media[i], 'a=crypto:', this.session);
            if (crypto.length) {
                elem.c('encryption', {required: 1});
                crypto.forEach(function(line) {
                    elem.c('crypto', SDPUtil.parse_crypto(line)).up();
                });
                elem.up(); // end of encryption
            }

            if (ssrc) {
                // new style mapping
                elem.c('source', { ssrc, xmlns: 'urn:xmpp:jingle:apps:rtp:ssma:0' });
                // FIXME: group by ssrc and support multiple different ssrcs
                const ssrclines = SDPUtil.find_lines(this.media[i], 'a=ssrc:');
                if(ssrclines.length > 0) {
                    ssrclines.forEach(function(line) {
                        const idx = line.indexOf(' ');
                        const linessrc = line.substr(0, idx).substr(7);
                        if (linessrc != ssrc) {
                            elem.up();
                            ssrc = linessrc;
                            elem.c('source', { ssrc, xmlns: 'urn:xmpp:jingle:apps:rtp:ssma:0' });
                        }
                        const kv = line.substr(idx + 1);
                        elem.c('parameter');
                        if (kv.indexOf(':') == -1) {
                            elem.attrs({ name: kv });
                        } else {
                            const k = kv.split(':', 2)[0];
                            elem.attrs({ name: k });

                            let v = kv.split(':', 2)[1];
                            v = SDPUtil.filter_special_chars(v);
                            elem.attrs({ value: v });
                        }
                        elem.up();
                    });
                } else {
                    elem.up();
                    elem.c('source', { ssrc, xmlns: 'urn:xmpp:jingle:apps:rtp:ssma:0' });
                    elem.c('parameter');
                    elem.attrs({name: 'cname', value:Math.random().toString(36).substring(7)});
                    elem.up();
                    // FIXME what case does this code handle ? remove ???
                    let msid = null;
                    // FIXME what is this ? global APP.RTC in SDP ?
                    const localTrack = APP.RTC.getLocalTracks(mline.media);
                    if (localTrack) {
                        // FIXME before this changes the track id was accessed,
                        // but msid stands for the stream id, makes no sense ?
                        msid = localTrack.getTrackId();
                    }
                    if(msid !== null) {
                        msid = SDPUtil.filter_special_chars(msid);
                        elem.c('parameter');
                        elem.attrs({name: 'msid', value:msid});
                        elem.up();
                        elem.c('parameter');
                        elem.attrs({name: 'mslabel', value:msid});
                        elem.up();
                        elem.c('parameter');
                        elem.attrs({name: 'label', value:msid});
                        elem.up();
                    }
                }
                elem.up();

                // XEP-0339 handle ssrc-group attributes
                const ssrc_group_lines = SDPUtil.find_lines(this.media[i], 'a=ssrc-group:');
                ssrc_group_lines.forEach(function(line) {
                    const idx = line.indexOf(' ');
                    const semantics = line.substr(0, idx).substr(13);
                    const ssrcs = line.substr(14 + semantics.length).split(' ');
                    if (ssrcs.length) {
                        elem.c('ssrc-group', { semantics, xmlns: 'urn:xmpp:jingle:apps:rtp:ssma:0' });
                        ssrcs.forEach(function(ssrc) {
                            elem.c('source', { ssrc })
                                .up();
                        });
                        elem.up();
                    }
                });
            }

            if (SDPUtil.find_line(this.media[i], 'a=rtcp-mux')) {
                elem.c('rtcp-mux').up();
            }

            // XEP-0293 -- map a=rtcp-fb:*
            this.rtcpFbToJingle(i, elem, '*');

            // XEP-0294
            lines = SDPUtil.find_lines(this.media[i], 'a=extmap:');
            if (lines.length) {
                for (j = 0; j < lines.length; j++) {
                    tmp = SDPUtil.parse_extmap(lines[j]);
                    elem.c('rtp-hdrext', { xmlns: 'urn:xmpp:jingle:apps:rtp:rtp-hdrext:0',
                        uri: tmp.uri,
                        id: tmp.value });
                    if (tmp.hasOwnProperty('direction')) {
                        switch (tmp.direction) {
                        case 'sendonly':
                            elem.attrs({senders: 'responder'});
                            break;
                        case 'recvonly':
                            elem.attrs({senders: 'initiator'});
                            break;
                        case 'sendrecv':
                            elem.attrs({senders: 'both'});
                            break;
                        case 'inactive':
                            elem.attrs({senders: 'none'});
                            break;
                        }
                    }
                    // TODO: handle params
                    elem.up();
                }
            }
            elem.up(); // end of description
        }

        // map ice-ufrag/pwd, dtls fingerprint, candidates
        this.transportToJingle(i, elem);

        if (SDPUtil.find_line(this.media[i], 'a=sendrecv', this.session)) {
            elem.attrs({senders: 'both'});
        } else if (SDPUtil.find_line(this.media[i], 'a=sendonly', this.session)) {
            elem.attrs({senders: 'initiator'});
        } else if (SDPUtil.find_line(this.media[i], 'a=recvonly', this.session)) {
            elem.attrs({senders: 'responder'});
        } else if (SDPUtil.find_line(this.media[i], 'a=inactive', this.session)) {
            elem.attrs({senders: 'none'});
        }
        if (mline.port == '0') {
            // estos hack to reject an m-line
            elem.attrs({senders: 'rejected'});
        }
        elem.up(); // end of content
    }
    elem.up();
    return elem;
};

SDP.prototype.transportToJingle = function(mediaindex, elem) {
    let tmp;
    const self = this;
    elem.c('transport');

    // XEP-0343 DTLS/SCTP
    const sctpmap
        = SDPUtil.find_line(this.media[mediaindex], 'a=sctpmap:', self.session);
    if (sctpmap) {
        const sctpAttrs = SDPUtil.parse_sctpmap(sctpmap);
        elem.c('sctpmap', {
            xmlns: 'urn:xmpp:jingle:transports:dtls-sctp:1',
            number: sctpAttrs[0], /* SCTP port */
            protocol: sctpAttrs[1] /* protocol */
        });
        // Optional stream count attribute
        if (sctpAttrs.length > 2) {
            elem.attrs({ streams: sctpAttrs[2]});
        }
        elem.up();
    }
    // XEP-0320
    const fingerprints
        = SDPUtil.find_lines(this.media[mediaindex], 'a=fingerprint:', this.session);
    fingerprints.forEach(function(line) {
        tmp = SDPUtil.parse_fingerprint(line);
        tmp.xmlns = 'urn:xmpp:jingle:apps:dtls:0';
        elem.c('fingerprint').t(tmp.fingerprint);
        delete tmp.fingerprint;
        line = SDPUtil.find_line(self.media[mediaindex], 'a=setup:', self.session);
        if (line) {
            tmp.setup = line.substr(8);
        }
        elem.attrs(tmp);
        elem.up(); // end of fingerprint
    });
    tmp = SDPUtil.iceparams(this.media[mediaindex], this.session);
    if (tmp) {
        tmp.xmlns = 'urn:xmpp:jingle:transports:ice-udp:1';
        elem.attrs(tmp);
        // XEP-0176
        if (SDPUtil.find_line(this.media[mediaindex], 'a=candidate:', this.session)) { // add any a=candidate lines
            const lines = SDPUtil.find_lines(this.media[mediaindex], 'a=candidate:', this.session);
            lines.forEach(function(line) {
                const candidate = SDPUtil.candidateToJingle(line);
                if (self.failICE) {
                    candidate.ip = '1.1.1.1';
                }
                const protocol = candidate
                        && typeof candidate.protocol === 'string'
                    ? candidate.protocol.toLowerCase() : '';
                if ((self.removeTcpCandidates
                        && (protocol === 'tcp' || protocol === 'ssltcp'))
                    || (self.removeUdpCandidates && protocol === 'udp')) {
                    return;
                }
                elem.c('candidate', candidate).up();
            });
        }
    }
    elem.up(); // end of transport
};

SDP.prototype.rtcpFbToJingle = function(mediaindex, elem, payloadtype) { // XEP-0293
    const lines = SDPUtil.find_lines(this.media[mediaindex], 'a=rtcp-fb:' + payloadtype);
    lines.forEach(function(line) {
        const tmp = SDPUtil.parse_rtcpfb(line);
        if (tmp.type == 'trr-int') {
            elem.c('rtcp-fb-trr-int', {xmlns: 'urn:xmpp:jingle:apps:rtp:rtcp-fb:0', value: tmp.params[0]});
            elem.up();
        } else {
            elem.c('rtcp-fb', {xmlns: 'urn:xmpp:jingle:apps:rtp:rtcp-fb:0', type: tmp.type});
            if (tmp.params.length > 0) {
                elem.attrs({'subtype': tmp.params[0]});
            }
            elem.up();
        }
    });
};

SDP.prototype.rtcpFbFromJingle = function(elem, payloadtype) { // XEP-0293
    let media = '';
    let tmp = elem.find('>rtcp-fb-trr-int[xmlns="urn:xmpp:jingle:apps:rtp:rtcp-fb:0"]');
    if (tmp.length) {
        media += 'a=rtcp-fb:' + '*' + ' ' + 'trr-int' + ' ';
        if (tmp.attr('value')) {
            media += tmp.attr('value');
        } else {
            media += '0';
        }
        media += '\r\n';
    }
    tmp = elem.find('>rtcp-fb[xmlns="urn:xmpp:jingle:apps:rtp:rtcp-fb:0"]');
    tmp.each(function() {
        media += 'a=rtcp-fb:' + payloadtype + ' ' + $(this).attr('type');
        if ($(this).attr('subtype')) {
            media += ' ' + $(this).attr('subtype');
        }
        media += '\r\n';
    });
    return media;
};

// construct an SDP from a jingle stanza
SDP.prototype.fromJingle = function(jingle) {
    const self = this;
    this.raw = 'v=0\r\n'
        + 'o=- 1923518516 2 IN IP4 0.0.0.0\r\n'// FIXME
        + 's=-\r\n'
        + 't=0 0\r\n';
    // http://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-04#section-8
    if ($(jingle).find('>group[xmlns="urn:xmpp:jingle:apps:grouping:0"]').length) {
        $(jingle).find('>group[xmlns="urn:xmpp:jingle:apps:grouping:0"]').each(function(idx, group) {
            const contents = $(group).find('>content').map(function(idx, content) {
                return content.getAttribute('name');
            }).get();
            if (contents.length > 0) {
                self.raw += 'a=group:' + (group.getAttribute('semantics') || group.getAttribute('type')) + ' ' + contents.join(' ') + '\r\n';
            }
        });
    }

    this.session = this.raw;
    jingle.find('>content').each(function() {
        const m = self.jingle2media($(this));
        self.media.push(m);
    });

    // reconstruct msid-semantic -- apparently not necessary
    /*
     var msid = SDPUtil.parse_ssrc(this.raw);
     if (msid.hasOwnProperty('mslabel')) {
     this.session += "a=msid-semantic: WMS " + msid.mslabel + "\r\n";
     }
     */

    this.raw = this.session + this.media.join('');
};

// translate a jingle content element into an an SDP media part
SDP.prototype.jingle2media = function(content) {
    const desc = content.find('description');
    let media = '';
    const self = this;
    const sctp = content.find(
        '>transport>sctpmap[xmlns="urn:xmpp:jingle:transports:dtls-sctp:1"]');

    let tmp = { media: desc.attr('media') };
    tmp.port = '1';
    if (content.attr('senders') == 'rejected') {
        // estos hack to reject an m-line.
        tmp.port = '0';
    }
    if (content.find('>transport>fingerprint').length
            || desc.find('encryption').length) {
        tmp.proto = sctp.length ? 'DTLS/SCTP' : 'RTP/SAVPF';
    } else {
        tmp.proto = 'RTP/AVPF';
    }
    if (!sctp.length) {
        tmp.fmt = desc.find('payload-type').map(
            function() {
                return this.getAttribute('id');
            }).get();
        media += SDPUtil.build_mline(tmp) + '\r\n';
    } else {
        media += 'm=application 1 DTLS/SCTP ' + sctp.attr('number') + '\r\n';
        media += 'a=sctpmap:' + sctp.attr('number')
            + ' ' + sctp.attr('protocol');

        const streamCount = sctp.attr('streams');
        if (streamCount) {
            media += ' ' + streamCount + '\r\n';
        } else {
            media += '\r\n';
        }
    }

    media += 'c=IN IP4 0.0.0.0\r\n';
    if (!sctp.length) {
        media += 'a=rtcp:1 IN IP4 0.0.0.0\r\n';
    }
    tmp = content.find('>transport[xmlns="urn:xmpp:jingle:transports:ice-udp:1"]');
    if (tmp.length) {
        if (tmp.attr('ufrag')) {
            media += SDPUtil.build_iceufrag(tmp.attr('ufrag')) + '\r\n';
        }
        if (tmp.attr('pwd')) {
            media += SDPUtil.build_icepwd(tmp.attr('pwd')) + '\r\n';
        }
        tmp.find('>fingerprint').each(function() {
            // FIXME: check namespace at some point
            media += 'a=fingerprint:' + this.getAttribute('hash');
            media += ' ' + $(this).text();
            media += '\r\n';
            if (this.getAttribute('setup')) {
                media += 'a=setup:' + this.getAttribute('setup') + '\r\n';
            }
        });
    }
    switch (content.attr('senders')) {
    case 'initiator':
        media += 'a=sendonly\r\n';
        break;
    case 'responder':
        media += 'a=recvonly\r\n';
        break;
    case 'none':
        media += 'a=inactive\r\n';
        break;
    case 'both':
        media += 'a=sendrecv\r\n';
        break;
    }
    media += 'a=mid:' + content.attr('name') + '\r\n';

    // <description><rtcp-mux/></description>
    // see http://code.google.com/p/libjingle/issues/detail?id=309 -- no spec though
    // and http://mail.jabber.org/pipermail/jingle/2011-December/001761.html
    if (desc.find('rtcp-mux').length) {
        media += 'a=rtcp-mux\r\n';
    }

    if (desc.find('encryption').length) {
        desc.find('encryption>crypto').each(function() {
            media += 'a=crypto:' + this.getAttribute('tag');
            media += ' ' + this.getAttribute('crypto-suite');
            media += ' ' + this.getAttribute('key-params');
            if (this.getAttribute('session-params')) {
                media += ' ' + this.getAttribute('session-params');
            }
            media += '\r\n';
        });
    }
    desc.find('payload-type').each(function() {
        media += SDPUtil.build_rtpmap(this) + '\r\n';
        if ($(this).find('>parameter').length) {
            media += 'a=fmtp:' + this.getAttribute('id') + ' ';
            media += $(this).find('parameter').map(function() {
                return (this.getAttribute('name')
                        ? this.getAttribute('name') + '=' : '')
                    + this.getAttribute('value');
            }).get().join('; ');
            media += '\r\n';
        }
        // xep-0293
        media += self.rtcpFbFromJingle($(this), this.getAttribute('id'));
    });

    // xep-0293
    media += self.rtcpFbFromJingle(desc, '*');

    // xep-0294
    tmp = desc.find('>rtp-hdrext[xmlns="urn:xmpp:jingle:apps:rtp:rtp-hdrext:0"]');
    tmp.each(function() {
        media += 'a=extmap:' + this.getAttribute('id') + ' ' + this.getAttribute('uri') + '\r\n';
    });

    content.find('>transport[xmlns="urn:xmpp:jingle:transports:ice-udp:1"]>candidate').each(function() {
        let protocol = this.getAttribute('protocol');
        protocol = typeof protocol === 'string' ? protocol.toLowerCase() : '';

        if ((self.removeTcpCandidates
                && (protocol === 'tcp' || protocol === 'ssltcp'))
            || (self.removeUdpCandidates && protocol === 'udp')) {
            return;
        } else if (self.failICE) {
            this.setAttribute('ip', '1.1.1.1');
        }

        media += SDPUtil.candidateFromJingle(this);
    });

    // XEP-0339 handle ssrc-group attributes
    content.find('description>ssrc-group[xmlns="urn:xmpp:jingle:apps:rtp:ssma:0"]').each(function() {
        const semantics = this.getAttribute('semantics');
        const ssrcs = $(this).find('>source').map(function() {
            return this.getAttribute('ssrc');
        }).get();

        if (ssrcs.length) {
            media += 'a=ssrc-group:' + semantics + ' ' + ssrcs.join(' ') + '\r\n';
        }
    });

    tmp = content.find('description>source[xmlns="urn:xmpp:jingle:apps:rtp:ssma:0"]');
    tmp.each(function() {
        const ssrc = this.getAttribute('ssrc');
        $(this).find('>parameter').each(function() {
            const name = this.getAttribute('name');
            let value = this.getAttribute('value');
            value = SDPUtil.filter_special_chars(value);
            media += 'a=ssrc:' + ssrc + ' ' + name;
            if (value && value.length) {
                media += ':' + value;
            }
            media += '\r\n';
        });
    });

    return media;
};


module.exports = SDP;