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 mediaAttributes.put("ice-ufrag", ufrag);
148 }
149 checkNoWhitespace(ufrag, "ufrag value must not contain any whitespaces");
150 if (!Strings.isNullOrEmpty(pwd)) {
151 mediaAttributes.put("ice-pwd", pwd);
152 }
153 checkNoWhitespace(pwd, "pwd value must not contain any whitespaces");
154 mediaAttributes.put("ice-options", HARDCODED_ICE_OPTIONS);
155 final IceUdpTransportInfo.Fingerprint fingerprint = transport.getFingerprint();
156 if (fingerprint != null) {
157 mediaAttributes.put("fingerprint", fingerprint.getHash() + " " + fingerprint.getContent());
158 mediaAttributes.put("setup", fingerprint.getSetup());
159 }
160 final ImmutableList.Builder<Integer> formatBuilder = new ImmutableList.Builder<>();
161 for (RtpDescription.PayloadType payloadType : description.getPayloadTypes()) {
162 final String id = payloadType.getId();
163 if (Strings.isNullOrEmpty(id)) {
164 throw new IllegalArgumentException("Payload type is missing id");
165 }
166 if (!isInt(id)) {
167 throw new IllegalArgumentException("Payload id is not numeric");
168 }
169 formatBuilder.add(payloadType.getIntId());
170 mediaAttributes.put("rtpmap", payloadType.toSdpAttribute());
171 final List<RtpDescription.Parameter> parameters = payloadType.getParameters();
172 if (parameters.size() == 1) {
173 mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(id, parameters.get(0)));
174 } else if (parameters.size() > 0) {
175 mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(id, parameters));
176 }
177 for (RtpDescription.FeedbackNegotiation feedbackNegotiation : payloadType.getFeedbackNegotiations()) {
178 final String type = feedbackNegotiation.getType();
179 final String subtype = feedbackNegotiation.getSubType();
180 if (Strings.isNullOrEmpty(type)) {
181 throw new IllegalArgumentException("a feedback for payload-type " + id + " negotiation is missing type");
182 }
183 checkNoWhitespace(type, "feedback negotiation type must not contain whitespace");
184 mediaAttributes.put("rtcp-fb", id + " " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype));
185 }
186 for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : payloadType.feedbackNegotiationTrrInts()) {
187 mediaAttributes.put("rtcp-fb", id + " trr-int " + feedbackNegotiationTrrInt.getValue());
188 }
189 }
190
191 for (RtpDescription.FeedbackNegotiation feedbackNegotiation : description.getFeedbackNegotiations()) {
192 final String type = feedbackNegotiation.getType();
193 final String subtype = feedbackNegotiation.getSubType();
194 if (Strings.isNullOrEmpty(type)) {
195 throw new IllegalArgumentException("a feedback negotiation is missing type");
196 }
197 checkNoWhitespace(type, "feedback negotiation type must not contain whitespace");
198 mediaAttributes.put("rtcp-fb", "* " + type + (Strings.isNullOrEmpty(subtype) ? "" : " " + subtype));
199 }
200 for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : description.feedbackNegotiationTrrInts()) {
201 mediaAttributes.put("rtcp-fb", "* trr-int " + feedbackNegotiationTrrInt.getValue());
202 }
203 for (RtpDescription.RtpHeaderExtension extension : description.getHeaderExtensions()) {
204 final String id = extension.getId();
205 final String uri = extension.getUri();
206 if (Strings.isNullOrEmpty(id)) {
207 throw new IllegalArgumentException("A header extension is missing id");
208 }
209 checkNoWhitespace(id, "header extension id must not contain whitespace");
210 if (Strings.isNullOrEmpty(uri)) {
211 throw new IllegalArgumentException("A header extension is missing uri");
212 }
213 checkNoWhitespace(uri, "feedback negotiation uri must not contain whitespace");
214 mediaAttributes.put("extmap", id + " " + uri);
215 }
216 for (RtpDescription.SourceGroup sourceGroup : description.getSourceGroups()) {
217 final String semantics = sourceGroup.getSemantics();
218 final List<String> groups = sourceGroup.getSsrcs();
219 if (Strings.isNullOrEmpty(semantics)) {
220 throw new IllegalArgumentException("A SSRC group is missing semantics attribute");
221 }
222 checkNoWhitespace(semantics, "source group semantics must not contain whitespace");
223 if (groups.size() == 0) {
224 throw new IllegalArgumentException("A SSRC group is missing SSRC ids");
225 }
226 mediaAttributes.put("ssrc-group", String.format("%s %s", semantics, Joiner.on(' ').join(groups)));
227 }
228 for (RtpDescription.Source source : description.getSources()) {
229 for (RtpDescription.Source.Parameter parameter : source.getParameters()) {
230 final String id = source.getSsrcId();
231 final String parameterName = parameter.getParameterName();
232 final String parameterValue = parameter.getParameterValue();
233 if (Strings.isNullOrEmpty(id)) {
234 throw new IllegalArgumentException("A source specific media attribute is missing the id");
235 }
236 checkNoWhitespace(id, "A source specific media attributes must not contain whitespaces");
237 if (Strings.isNullOrEmpty(parameterName)) {
238 throw new IllegalArgumentException("A source specific media attribute is missing its name");
239 }
240 if (Strings.isNullOrEmpty(parameterValue)) {
241 throw new IllegalArgumentException("A source specific media attribute is missing its value");
242 }
243 mediaAttributes.put("ssrc", id + " " + parameterName + ":" + parameterValue);
244 }
245 }
246
247 mediaAttributes.put("mid", name);
248
249 //random additional attributes
250 mediaAttributes.put("rtcp", "9 IN IP4 0.0.0.0");
251 mediaAttributes.put("sendrecv", "");
252
253 if (description.hasChild("rtcp-mux", Namespace.JINGLE_APPS_RTP)) {
254 mediaAttributes.put("rtcp-mux", "");
255 }
256
257 final MediaBuilder mediaBuilder = new MediaBuilder();
258 mediaBuilder.setMedia(description.getMedia().toString().toLowerCase(Locale.ROOT));
259 mediaBuilder.setConnectionData(HARDCODED_CONNECTION);
260 mediaBuilder.setPort(HARDCODED_MEDIA_PORT);
261 mediaBuilder.setProtocol(HARDCODED_MEDIA_PROTOCOL);
262 mediaBuilder.setAttributes(mediaAttributes);
263 mediaBuilder.setFormats(formatBuilder.build());
264 mediaListBuilder.add(mediaBuilder.createMedia());
265
266 }
267 sessionDescriptionBuilder.setVersion(0);
268 sessionDescriptionBuilder.setName("-");
269 sessionDescriptionBuilder.setMedia(mediaListBuilder.build());
270 sessionDescriptionBuilder.setAttributes(attributeMap);
271
272 return sessionDescriptionBuilder.createSessionDescription();
273 }
274
275 public static String checkNoWhitespace(final String input, final String message) {
276 if (CharMatcher.whitespace().matchesAnyOf(input)) {
277 throw new IllegalArgumentException(message);
278 }
279 return input;
280 }
281
282 public static int ignorantIntParser(final String input) {
283 try {
284 return Integer.parseInt(input);
285 } catch (NumberFormatException e) {
286 return 0;
287 }
288 }
289
290 public static boolean isInt(final String input) {
291 if (input == null) {
292 return false;
293 }
294 try {
295 Integer.parseInt(input);
296 return true;
297 } catch (NumberFormatException e) {
298 return false;
299 }
300 }
301
302 public static Pair<String, String> parseAttribute(final String input) {
303 final String[] pair = input.split(":", 2);
304 if (pair.length == 2) {
305 return new Pair<>(pair[0], pair[1]);
306 } else {
307 return new Pair<>(pair[0], "");
308 }
309 }
310
311 @Override
312 public String toString() {
313 final StringBuilder s = new StringBuilder()
314 .append("v=").append(version).append(LINE_DIVIDER)
315 //TODO randomize or static
316 .append("o=- 8770656990916039506 2 IN IP4 127.0.0.1").append(LINE_DIVIDER) //what ever that means
317 .append("s=").append(name).append(LINE_DIVIDER)
318 .append("t=0 0").append(LINE_DIVIDER);
319 appendAttributes(s, attributes);
320 for (Media media : this.media) {
321 s.append("m=").append(media.media).append(' ').append(media.port).append(' ').append(media.protocol).append(' ').append(Joiner.on(' ').join(media.formats)).append(LINE_DIVIDER);
322 s.append("c=").append(media.connectionData).append(LINE_DIVIDER);
323 appendAttributes(s, media.attributes);
324 }
325 return s.toString();
326 }
327
328 public static class Media {
329 public final String media;
330 public final int port;
331 public final String protocol;
332 public final List<Integer> formats;
333 public final String connectionData;
334 public final ArrayListMultimap<String, String> attributes;
335
336 public Media(String media, int port, String protocol, List<Integer> formats, String connectionData, ArrayListMultimap<String, String> attributes) {
337 this.media = media;
338 this.port = port;
339 this.protocol = protocol;
340 this.formats = formats;
341 this.connectionData = connectionData;
342 this.attributes = attributes;
343 }
344 }
345
346}