package eu.siacs.conversations.xmpp.jingle; import android.util.Log; import android.util.Pair; import com.google.common.base.CharMatcher; import com.google.common.base.Joiner; import com.google.common.base.Strings; import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.ImmutableList; import java.util.List; import java.util.Locale; import java.util.Map; import eu.siacs.conversations.Config; import eu.siacs.conversations.xml.Namespace; import eu.siacs.conversations.xmpp.jingle.stanzas.Group; import eu.siacs.conversations.xmpp.jingle.stanzas.IceUdpTransportInfo; import eu.siacs.conversations.xmpp.jingle.stanzas.RtpDescription; public class SessionDescription { public final static String LINE_DIVIDER = "\r\n"; private final static String HARDCODED_MEDIA_PROTOCOL = "UDP/TLS/RTP/SAVPF"; //probably only true for DTLS-SRTP aka when we have a fingerprint private final static int HARDCODED_MEDIA_PORT = 9; private final static String HARDCODED_ICE_OPTIONS = "trickle renomination"; private final static String HARDCODED_CONNECTION = "IN IP4 0.0.0.0"; public final int version; public final String name; public final String connectionData; public final ArrayListMultimap attributes; public final List media; public SessionDescription(int version, String name, String connectionData, ArrayListMultimap attributes, List media) { this.version = version; this.name = name; this.connectionData = connectionData; this.attributes = attributes; this.media = media; } private static void appendAttributes(StringBuilder s, ArrayListMultimap attributes) { for (Map.Entry attribute : attributes.entries()) { final String key = attribute.getKey(); final String value = attribute.getValue(); s.append("a=").append(key); if (!Strings.isNullOrEmpty(value)) { s.append(':').append(value); } s.append(LINE_DIVIDER); } } public static SessionDescription parse(final String input) { final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder(); MediaBuilder currentMediaBuilder = null; ArrayListMultimap attributeMap = ArrayListMultimap.create(); ImmutableList.Builder mediaBuilder = new ImmutableList.Builder<>(); for (final String line : input.split(LINE_DIVIDER)) { final String[] pair = line.trim().split("=", 2); if (pair.length < 2 || pair[0].length() != 1) { Log.d(Config.LOGTAG, "skipping sdp parsing on line " + line); continue; } final char key = pair[0].charAt(0); final String value = pair[1]; switch (key) { case 'v': sessionDescriptionBuilder.setVersion(ignorantIntParser(value)); break; case 'c': if (currentMediaBuilder != null) { currentMediaBuilder.setConnectionData(value); } else { sessionDescriptionBuilder.setConnectionData(value); } break; case 's': sessionDescriptionBuilder.setName(value); break; case 'a': final Pair attribute = parseAttribute(value); attributeMap.put(attribute.first, attribute.second); break; case 'm': if (currentMediaBuilder == null) { sessionDescriptionBuilder.setAttributes(attributeMap); ; } else { currentMediaBuilder.setAttributes(attributeMap); mediaBuilder.add(currentMediaBuilder.createMedia()); } attributeMap = ArrayListMultimap.create(); currentMediaBuilder = new MediaBuilder(); final String[] parts = value.split(" "); if (parts.length >= 3) { currentMediaBuilder.setMedia(parts[0]); currentMediaBuilder.setPort(ignorantIntParser(parts[1])); currentMediaBuilder.setProtocol(parts[2]); ImmutableList.Builder formats = new ImmutableList.Builder<>(); for (int i = 3; i < parts.length; ++i) { formats.add(ignorantIntParser(parts[i])); } currentMediaBuilder.setFormats(formats.build()); } else { Log.d(Config.LOGTAG, "skipping media line " + line); } break; } } if (currentMediaBuilder != null) { currentMediaBuilder.setAttributes(attributeMap); mediaBuilder.add(currentMediaBuilder.createMedia()); } else { sessionDescriptionBuilder.setAttributes(attributeMap); } sessionDescriptionBuilder.setMedia(mediaBuilder.build()); return sessionDescriptionBuilder.createSessionDescription(); } public static SessionDescription of(final RtpContentMap contentMap) { final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder(); final ArrayListMultimap attributeMap = ArrayListMultimap.create(); final ImmutableList.Builder mediaListBuilder = new ImmutableList.Builder<>(); final Group group = contentMap.group; if (group != null) { final String semantics = group.getSemantics(); checkNoWhitespace(semantics, "group semantics value must not contain any whitespace"); attributeMap.put("group", group.getSemantics() + " " + Joiner.on(' ').join(group.getIdentificationTags())); } attributeMap.put("msid-semantic", " WMS my-media-stream"); for (final Map.Entry entry : contentMap.contents.entrySet()) { final String name = entry.getKey(); RtpContentMap.DescriptionTransport descriptionTransport = entry.getValue(); RtpDescription description = descriptionTransport.description; IceUdpTransportInfo transport = descriptionTransport.transport; final ArrayListMultimap mediaAttributes = ArrayListMultimap.create(); final String ufrag = transport.getAttribute("ufrag"); final String pwd = transport.getAttribute("pwd"); if (!Strings.isNullOrEmpty(ufrag)) { mediaAttributes.put("ice-ufrag", ufrag); } checkNoWhitespace(ufrag, "ufrag value must not contain any whitespaces"); if (!Strings.isNullOrEmpty(pwd)) { mediaAttributes.put("ice-pwd", pwd); } checkNoWhitespace(pwd, "pwd value must not contain any whitespaces"); mediaAttributes.put("ice-options", HARDCODED_ICE_OPTIONS); final IceUdpTransportInfo.Fingerprint fingerprint = transport.getFingerprint(); if (fingerprint != null) { mediaAttributes.put("fingerprint", fingerprint.getHash() + " " + fingerprint.getContent()); mediaAttributes.put("setup", fingerprint.getSetup()); } final ImmutableList.Builder formatBuilder = new ImmutableList.Builder<>(); for (RtpDescription.PayloadType payloadType : description.getPayloadTypes()) { final String id = payloadType.getId(); if (Strings.isNullOrEmpty(id)) { throw new IllegalArgumentException("Payload type is missing id"); } if (!isInt(id)) { throw new IllegalArgumentException("Payload id is not numeric"); } formatBuilder.add(payloadType.getIntId()); mediaAttributes.put("rtpmap", payloadType.toSdpAttribute()); List parameters = payloadType.getParameters(); if (parameters.size() > 0) { mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(id, parameters)); } for (RtpDescription.FeedbackNegotiation feedbackNegotiation : payloadType.getFeedbackNegotiations()) { final String type = feedbackNegotiation.getType(); final String subtype = feedbackNegotiation.getSubType(); if (Strings.isNullOrEmpty(type)) { throw new IllegalArgumentException("a feedback for payload-type " + id + " negotiation is missing type"); } checkNoWhitespace(type, "feedback negotiation type must not contain whitespace"); mediaAttributes.put("rtcp-fb", id + " " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype)); } for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : payloadType.feedbackNegotiationTrrInts()) { mediaAttributes.put("rtcp-fb", id + " trr-int " + feedbackNegotiationTrrInt.getValue()); } } for (RtpDescription.FeedbackNegotiation feedbackNegotiation : description.getFeedbackNegotiations()) { final String type = feedbackNegotiation.getType(); final String subtype = feedbackNegotiation.getSubType(); if (Strings.isNullOrEmpty(type)) { throw new IllegalArgumentException("a feedback negotiation is missing type"); } checkNoWhitespace(type, "feedback negotiation type must not contain whitespace"); mediaAttributes.put("rtcp-fb", "* " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype)); } for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : description.feedbackNegotiationTrrInts()) { mediaAttributes.put("rtcp-fb", "* trr-int " + feedbackNegotiationTrrInt.getValue()); } for (RtpDescription.RtpHeaderExtension extension : description.getHeaderExtensions()) { final String id = extension.getId(); final String uri = extension.getUri(); if (Strings.isNullOrEmpty(id)) { throw new IllegalArgumentException("A header extension is missing id"); } checkNoWhitespace(id, "header extension id must not contain whitespace"); if (Strings.isNullOrEmpty(uri)) { throw new IllegalArgumentException("A header extension is missing uri"); } checkNoWhitespace(uri, "feedback negotiation uri must not contain whitespace"); mediaAttributes.put("extmap", id + " " + uri); } for (RtpDescription.SourceGroup sourceGroup : description.getSourceGroups()) { final String semantics = sourceGroup.getSemantics(); final List groups = sourceGroup.getSsrcs(); if (Strings.isNullOrEmpty(semantics)) { throw new IllegalArgumentException("A SSRC group is missing semantics attribute"); } checkNoWhitespace(semantics, "source group semantics must not contain whitespace"); if (groups.size() == 0) { throw new IllegalArgumentException("A SSRC group is missing SSRC ids"); } mediaAttributes.put("ssrc-group", String.format("%s %s", semantics, Joiner.on(' ').join(groups))); } for (RtpDescription.Source source : description.getSources()) { for (RtpDescription.Source.Parameter parameter : source.getParameters()) { final String id = source.getSsrcId(); final String parameterName = parameter.getParameterName(); final String parameterValue = parameter.getParameterValue(); if (Strings.isNullOrEmpty(id)) { throw new IllegalArgumentException("A source specific media attribute is missing the id"); } checkNoWhitespace(id, "A source specific media attributes must not contain whitespaces"); if (Strings.isNullOrEmpty(parameterName)) { throw new IllegalArgumentException("A source specific media attribute is missing its name"); } if (Strings.isNullOrEmpty(parameterValue)) { throw new IllegalArgumentException("A source specific media attribute is missing its value"); } mediaAttributes.put("ssrc", id + " " + parameterName + ":" + parameterValue); } } mediaAttributes.put("mid", name); //random additional attributes mediaAttributes.put("rtcp", "9 IN IP4 0.0.0.0"); mediaAttributes.put("sendrecv", ""); if (description.hasChild("rtcp-mux", Namespace.JINGLE_APPS_RTP)) { mediaAttributes.put("rtcp-mux", ""); } final MediaBuilder mediaBuilder = new MediaBuilder(); mediaBuilder.setMedia(description.getMedia().toString().toLowerCase(Locale.ROOT)); mediaBuilder.setConnectionData(HARDCODED_CONNECTION); mediaBuilder.setPort(HARDCODED_MEDIA_PORT); mediaBuilder.setProtocol(HARDCODED_MEDIA_PROTOCOL); mediaBuilder.setAttributes(mediaAttributes); mediaBuilder.setFormats(formatBuilder.build()); mediaListBuilder.add(mediaBuilder.createMedia()); } sessionDescriptionBuilder.setVersion(0); sessionDescriptionBuilder.setName("-"); sessionDescriptionBuilder.setMedia(mediaListBuilder.build()); sessionDescriptionBuilder.setAttributes(attributeMap); return sessionDescriptionBuilder.createSessionDescription(); } public static String checkNoWhitespace(final String input, final String message) { if (CharMatcher.whitespace().matchesAnyOf(input)) { throw new IllegalArgumentException(message); } return input; } public static int ignorantIntParser(final String input) { try { return Integer.parseInt(input); } catch (NumberFormatException e) { return 0; } } public static boolean isInt(final String input) { if (input == null) { return false; } try { Integer.parseInt(input); return true; } catch (NumberFormatException e) { return false; } } public static Pair parseAttribute(final String input) { final String[] pair = input.split(":", 2); if (pair.length == 2) { return new Pair<>(pair[0], pair[1]); } else { return new Pair<>(pair[0], ""); } } @Override public String toString() { final StringBuilder s = new StringBuilder() .append("v=").append(version).append(LINE_DIVIDER) //TODO randomize or static .append("o=- 8770656990916039506 2 IN IP4 127.0.0.1").append(LINE_DIVIDER) //what ever that means .append("s=").append(name).append(LINE_DIVIDER) .append("t=0 0").append(LINE_DIVIDER); appendAttributes(s, attributes); for (Media media : this.media) { s.append("m=").append(media.media).append(' ').append(media.port).append(' ').append(media.protocol).append(' ').append(Joiner.on(' ').join(media.formats)).append(LINE_DIVIDER); s.append("c=").append(media.connectionData).append(LINE_DIVIDER); appendAttributes(s, media.attributes); } return s.toString(); } public static class Media { public final String media; public final int port; public final String protocol; public final List formats; public final String connectionData; public final ArrayListMultimap attributes; public Media(String media, int port, String protocol, List formats, String connectionData, ArrayListMultimap attributes) { this.media = media; this.port = port; this.protocol = protocol; this.formats = formats; this.connectionData = connectionData; this.attributes = attributes; } } }