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