1package eu.siacs.conversations.xmpp.jingle;
2
3import android.util.Log;
4import android.util.Pair;
5
6import com.google.common.base.CharMatcher;
7import com.google.common.base.Joiner;
8import com.google.common.base.Strings;
9import com.google.common.collect.ArrayListMultimap;
10import com.google.common.collect.ImmutableList;
11
12import java.util.List;
13import java.util.Locale;
14import java.util.Map;
15
16import eu.siacs.conversations.Config;
17import eu.siacs.conversations.xml.Namespace;
18import eu.siacs.conversations.xmpp.jingle.stanzas.Group;
19import eu.siacs.conversations.xmpp.jingle.stanzas.IceUdpTransportInfo;
20import eu.siacs.conversations.xmpp.jingle.stanzas.RtpDescription;
21
22public class SessionDescription {
23
24 public final static String LINE_DIVIDER = "\r\n";
25 private final static String HARDCODED_MEDIA_PROTOCOL = "UDP/TLS/RTP/SAVPF"; //probably only true for DTLS-SRTP aka when we have a fingerprint
26 private final static int HARDCODED_MEDIA_PORT = 9;
27 private final static String HARDCODED_ICE_OPTIONS = "trickle renomination";
28 private final static String HARDCODED_CONNECTION = "IN IP4 0.0.0.0";
29
30 public final int version;
31 public final String name;
32 public final String connectionData;
33 public final ArrayListMultimap<String, String> attributes;
34 public final List<Media> media;
35
36
37 public SessionDescription(int version, String name, String connectionData, ArrayListMultimap<String, String> attributes, List<Media> media) {
38 this.version = version;
39 this.name = name;
40 this.connectionData = connectionData;
41 this.attributes = attributes;
42 this.media = media;
43 }
44
45 private static void appendAttributes(StringBuilder s, ArrayListMultimap<String, String> attributes) {
46 for (Map.Entry<String, String> attribute : attributes.entries()) {
47 final String key = attribute.getKey();
48 final String value = attribute.getValue();
49 s.append("a=").append(key);
50 if (!Strings.isNullOrEmpty(value)) {
51 s.append(':').append(value);
52 }
53 s.append(LINE_DIVIDER);
54 }
55 }
56
57 public static SessionDescription parse(final String input) {
58 final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder();
59 MediaBuilder currentMediaBuilder = null;
60 ArrayListMultimap<String, String> attributeMap = ArrayListMultimap.create();
61 ImmutableList.Builder<Media> mediaBuilder = new ImmutableList.Builder<>();
62 for (final String line : input.split(LINE_DIVIDER)) {
63 final String[] pair = line.trim().split("=", 2);
64 if (pair.length < 2 || pair[0].length() != 1) {
65 Log.d(Config.LOGTAG, "skipping sdp parsing on line " + line);
66 continue;
67 }
68 final char key = pair[0].charAt(0);
69 final String value = pair[1];
70 switch (key) {
71 case 'v':
72 sessionDescriptionBuilder.setVersion(ignorantIntParser(value));
73 break;
74 case 'c':
75 if (currentMediaBuilder != null) {
76 currentMediaBuilder.setConnectionData(value);
77 } else {
78 sessionDescriptionBuilder.setConnectionData(value);
79 }
80 break;
81 case 's':
82 sessionDescriptionBuilder.setName(value);
83 break;
84 case 'a':
85 final Pair<String, String> attribute = parseAttribute(value);
86 attributeMap.put(attribute.first, attribute.second);
87 break;
88 case 'm':
89 if (currentMediaBuilder == null) {
90 sessionDescriptionBuilder.setAttributes(attributeMap);
91 ;
92 } else {
93 currentMediaBuilder.setAttributes(attributeMap);
94 mediaBuilder.add(currentMediaBuilder.createMedia());
95 }
96 attributeMap = ArrayListMultimap.create();
97 currentMediaBuilder = new MediaBuilder();
98 final String[] parts = value.split(" ");
99 if (parts.length >= 3) {
100 currentMediaBuilder.setMedia(parts[0]);
101 currentMediaBuilder.setPort(ignorantIntParser(parts[1]));
102 currentMediaBuilder.setProtocol(parts[2]);
103 ImmutableList.Builder<Integer> formats = new ImmutableList.Builder<>();
104 for (int i = 3; i < parts.length; ++i) {
105 formats.add(ignorantIntParser(parts[i]));
106 }
107 currentMediaBuilder.setFormats(formats.build());
108 } else {
109 Log.d(Config.LOGTAG, "skipping media line " + line);
110 }
111 break;
112 }
113
114 }
115 if (currentMediaBuilder != null) {
116 currentMediaBuilder.setAttributes(attributeMap);
117 mediaBuilder.add(currentMediaBuilder.createMedia());
118 } else {
119 sessionDescriptionBuilder.setAttributes(attributeMap);
120 }
121 sessionDescriptionBuilder.setMedia(mediaBuilder.build());
122 return sessionDescriptionBuilder.createSessionDescription();
123 }
124
125 public static SessionDescription of(final RtpContentMap contentMap) {
126 final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder();
127 final ArrayListMultimap<String, String> attributeMap = ArrayListMultimap.create();
128 final ImmutableList.Builder<Media> mediaListBuilder = new ImmutableList.Builder<>();
129 final Group group = contentMap.group;
130 if (group != null) {
131 final String semantics = group.getSemantics();
132 checkNoWhitespace(semantics, "group semantics value must not contain any whitespace");
133 attributeMap.put("group", group.getSemantics() + " " + Joiner.on(' ').join(group.getIdentificationTags()));
134 }
135
136 attributeMap.put("msid-semantic", " WMS my-media-stream");
137
138 for (final Map.Entry<String, RtpContentMap.DescriptionTransport> entry : contentMap.contents.entrySet()) {
139 final String name = entry.getKey();
140 RtpContentMap.DescriptionTransport descriptionTransport = entry.getValue();
141 RtpDescription description = descriptionTransport.description;
142 IceUdpTransportInfo transport = descriptionTransport.transport;
143 final ArrayListMultimap<String, String> mediaAttributes = ArrayListMultimap.create();
144 final String ufrag = transport.getAttribute("ufrag");
145 final String pwd = transport.getAttribute("pwd");
146 if (Strings.isNullOrEmpty(ufrag)) {
147 throw new IllegalArgumentException("Transport element is missing required ufrag attribute");
148 }
149 checkNoWhitespace(ufrag, "ufrag value must not contain any whitespaces");
150 mediaAttributes.put("ice-ufrag", ufrag);
151 if (Strings.isNullOrEmpty(pwd)) {
152 throw new IllegalArgumentException("Transport element is missing required pwd attribute");
153 }
154 checkNoWhitespace(pwd, "pwd value must not contain any whitespaces");
155 mediaAttributes.put("ice-pwd", pwd);
156 mediaAttributes.put("ice-options", HARDCODED_ICE_OPTIONS);
157 final IceUdpTransportInfo.Fingerprint fingerprint = transport.getFingerprint();
158 if (fingerprint != null) {
159 mediaAttributes.put("fingerprint", fingerprint.getHash() + " " + fingerprint.getContent());
160 mediaAttributes.put("setup", fingerprint.getSetup());
161 }
162 final ImmutableList.Builder<Integer> formatBuilder = new ImmutableList.Builder<>();
163 for (RtpDescription.PayloadType payloadType : description.getPayloadTypes()) {
164 final String id = payloadType.getId();
165 if (Strings.isNullOrEmpty(id)) {
166 throw new IllegalArgumentException("Payload type is missing id");
167 }
168 if (!isInt(id)) {
169 throw new IllegalArgumentException("Payload id is not numeric");
170 }
171 formatBuilder.add(payloadType.getIntId());
172 mediaAttributes.put("rtpmap", payloadType.toSdpAttribute());
173 final List<RtpDescription.Parameter> parameters = payloadType.getParameters();
174 if (parameters.size() == 1) {
175 mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(id, parameters.get(0)));
176 } else if (parameters.size() > 0) {
177 mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(id, parameters));
178 }
179 for (RtpDescription.FeedbackNegotiation feedbackNegotiation : payloadType.getFeedbackNegotiations()) {
180 final String type = feedbackNegotiation.getType();
181 final String subtype = feedbackNegotiation.getSubType();
182 if (Strings.isNullOrEmpty(type)) {
183 throw new IllegalArgumentException("a feedback for payload-type " + id + " negotiation is missing type");
184 }
185 checkNoWhitespace(type, "feedback negotiation type must not contain whitespace");
186 mediaAttributes.put("rtcp-fb", id + " " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype));
187 }
188 for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : payloadType.feedbackNegotiationTrrInts()) {
189 mediaAttributes.put("rtcp-fb", id + " trr-int " + feedbackNegotiationTrrInt.getValue());
190 }
191 }
192
193 for (RtpDescription.FeedbackNegotiation feedbackNegotiation : description.getFeedbackNegotiations()) {
194 final String type = feedbackNegotiation.getType();
195 final String subtype = feedbackNegotiation.getSubType();
196 if (Strings.isNullOrEmpty(type)) {
197 throw new IllegalArgumentException("a feedback negotiation is missing type");
198 }
199 checkNoWhitespace(type, "feedback negotiation type must not contain whitespace");
200 mediaAttributes.put("rtcp-fb", "* " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype));
201 }
202 for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : description.feedbackNegotiationTrrInts()) {
203 mediaAttributes.put("rtcp-fb", "* trr-int " + feedbackNegotiationTrrInt.getValue());
204 }
205 for (RtpDescription.RtpHeaderExtension extension : description.getHeaderExtensions()) {
206 final String id = extension.getId();
207 final String uri = extension.getUri();
208 if (Strings.isNullOrEmpty(id)) {
209 throw new IllegalArgumentException("A header extension is missing id");
210 }
211 checkNoWhitespace(id, "header extension id must not contain whitespace");
212 if (Strings.isNullOrEmpty(uri)) {
213 throw new IllegalArgumentException("A header extension is missing uri");
214 }
215 checkNoWhitespace(uri, "feedback negotiation uri must not contain whitespace");
216 mediaAttributes.put("extmap", id + " " + uri);
217 }
218 for (RtpDescription.SourceGroup sourceGroup : description.getSourceGroups()) {
219 final String semantics = sourceGroup.getSemantics();
220 final List<String> groups = sourceGroup.getSsrcs();
221 if (Strings.isNullOrEmpty(semantics)) {
222 throw new IllegalArgumentException("A SSRC group is missing semantics attribute");
223 }
224 checkNoWhitespace(semantics, "source group semantics must not contain whitespace");
225 if (groups.size() == 0) {
226 throw new IllegalArgumentException("A SSRC group is missing SSRC ids");
227 }
228 mediaAttributes.put("ssrc-group", String.format("%s %s", semantics, Joiner.on(' ').join(groups)));
229 }
230 for (RtpDescription.Source source : description.getSources()) {
231 for (RtpDescription.Source.Parameter parameter : source.getParameters()) {
232 final String id = source.getSsrcId();
233 final String parameterName = parameter.getParameterName();
234 final String parameterValue = parameter.getParameterValue();
235 if (Strings.isNullOrEmpty(id)) {
236 throw new IllegalArgumentException("A source specific media attribute is missing the id");
237 }
238 checkNoWhitespace(id, "A source specific media attributes must not contain whitespaces");
239 if (Strings.isNullOrEmpty(parameterName)) {
240 throw new IllegalArgumentException("A source specific media attribute is missing its name");
241 }
242 if (Strings.isNullOrEmpty(parameterValue)) {
243 throw new IllegalArgumentException("A source specific media attribute is missing its value");
244 }
245 mediaAttributes.put("ssrc", id + " " + parameterName + ":" + parameterValue);
246 }
247 }
248
249 mediaAttributes.put("mid", name);
250
251 //random additional attributes
252 mediaAttributes.put("rtcp", "9 IN IP4 0.0.0.0");
253 mediaAttributes.put("sendrecv", "");
254
255 if (description.hasChild("rtcp-mux", Namespace.JINGLE_APPS_RTP)) {
256 mediaAttributes.put("rtcp-mux", "");
257 }
258
259 final MediaBuilder mediaBuilder = new MediaBuilder();
260 mediaBuilder.setMedia(description.getMedia().toString().toLowerCase(Locale.ROOT));
261 mediaBuilder.setConnectionData(HARDCODED_CONNECTION);
262 mediaBuilder.setPort(HARDCODED_MEDIA_PORT);
263 mediaBuilder.setProtocol(HARDCODED_MEDIA_PROTOCOL);
264 mediaBuilder.setAttributes(mediaAttributes);
265 mediaBuilder.setFormats(formatBuilder.build());
266 mediaListBuilder.add(mediaBuilder.createMedia());
267
268 }
269 sessionDescriptionBuilder.setVersion(0);
270 sessionDescriptionBuilder.setName("-");
271 sessionDescriptionBuilder.setMedia(mediaListBuilder.build());
272 sessionDescriptionBuilder.setAttributes(attributeMap);
273
274 return sessionDescriptionBuilder.createSessionDescription();
275 }
276
277 public static String checkNoWhitespace(final String input, final String message) {
278 if (CharMatcher.whitespace().matchesAnyOf(input)) {
279 throw new IllegalArgumentException(message);
280 }
281 return input;
282 }
283
284 public static int ignorantIntParser(final String input) {
285 try {
286 return Integer.parseInt(input);
287 } catch (NumberFormatException e) {
288 return 0;
289 }
290 }
291
292 public static boolean isInt(final String input) {
293 if (input == null) {
294 return false;
295 }
296 try {
297 Integer.parseInt(input);
298 return true;
299 } catch (NumberFormatException e) {
300 return false;
301 }
302 }
303
304 public static Pair<String, String> parseAttribute(final String input) {
305 final String[] pair = input.split(":", 2);
306 if (pair.length == 2) {
307 return new Pair<>(pair[0], pair[1]);
308 } else {
309 return new Pair<>(pair[0], "");
310 }
311 }
312
313 @Override
314 public String toString() {
315 final StringBuilder s = new StringBuilder()
316 .append("v=").append(version).append(LINE_DIVIDER)
317 //TODO randomize or static
318 .append("o=- 8770656990916039506 2 IN IP4 127.0.0.1").append(LINE_DIVIDER) //what ever that means
319 .append("s=").append(name).append(LINE_DIVIDER)
320 .append("t=0 0").append(LINE_DIVIDER);
321 appendAttributes(s, attributes);
322 for (Media media : this.media) {
323 s.append("m=").append(media.media).append(' ').append(media.port).append(' ').append(media.protocol).append(' ').append(Joiner.on(' ').join(media.formats)).append(LINE_DIVIDER);
324 s.append("c=").append(media.connectionData).append(LINE_DIVIDER);
325 appendAttributes(s, media.attributes);
326 }
327 return s.toString();
328 }
329
330 public static class Media {
331 public final String media;
332 public final int port;
333 public final String protocol;
334 public final List<Integer> formats;
335 public final String connectionData;
336 public final ArrayListMultimap<String, String> attributes;
337
338 public Media(String media, int port, String protocol, List<Integer> formats, String connectionData, ArrayListMultimap<String, String> attributes) {
339 this.media = media;
340 this.port = port;
341 this.protocol = protocol;
342 this.formats = formats;
343 this.connectionData = connectionData;
344 this.attributes = attributes;
345 }
346 }
347
348}