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.xmpp.jingle.stanzas.Group;
18import eu.siacs.conversations.xmpp.jingle.stanzas.IceUdpTransportInfo;
19import eu.siacs.conversations.xmpp.jingle.stanzas.RtpDescription;
20
21public class SessionDescription {
22
23 public final static String LINE_DIVIDER = "\r\n";
24 private final static String HARDCODED_MEDIA_PROTOCOL = "UDP/TLS/RTP/SAVPF"; //probably only true for DTLS-SRTP aka when we have a fingerprint
25 private final static int HARDCODED_MEDIA_PORT = 9;
26 private final static String HARDCODED_ICE_OPTIONS = "trickle renomination";
27 private final static String HARDCODED_CONNECTION = "IN IP4 0.0.0.0";
28
29 public final int version;
30 public final String name;
31 public final String connectionData;
32 public final ArrayListMultimap<String, String> attributes;
33 public final List<Media> media;
34
35
36 public SessionDescription(int version, String name, String connectionData, ArrayListMultimap<String, String> attributes, List<Media> media) {
37 this.version = version;
38 this.name = name;
39 this.connectionData = connectionData;
40 this.attributes = attributes;
41 this.media = media;
42 }
43
44 private static void appendAttributes(StringBuilder s, ArrayListMultimap<String, String> attributes) {
45 for (Map.Entry<String, String> attribute : attributes.entries()) {
46 final String key = attribute.getKey();
47 final String value = attribute.getValue();
48 s.append("a=").append(key);
49 if (!Strings.isNullOrEmpty(value)) {
50 s.append(':').append(value);
51 }
52 s.append(LINE_DIVIDER);
53 }
54 }
55
56 public static SessionDescription parse(final Map<String, RtpContentMap.DescriptionTransport> contents) {
57 final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder();
58 return sessionDescriptionBuilder.createSessionDescription();
59 }
60
61 public static SessionDescription parse(final String input) {
62 final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder();
63 MediaBuilder currentMediaBuilder = null;
64 ArrayListMultimap<String, String> attributeMap = ArrayListMultimap.create();
65 ImmutableList.Builder<Media> mediaBuilder = new ImmutableList.Builder<>();
66 for (final String line : input.split(LINE_DIVIDER)) {
67 final String[] pair = line.trim().split("=", 2);
68 if (pair.length < 2 || pair[0].length() != 1) {
69 Log.d(Config.LOGTAG, "skipping sdp parsing on line " + line);
70 continue;
71 }
72 final char key = pair[0].charAt(0);
73 final String value = pair[1];
74 switch (key) {
75 case 'v':
76 sessionDescriptionBuilder.setVersion(ignorantIntParser(value));
77 break;
78 case 'c':
79 if (currentMediaBuilder != null) {
80 currentMediaBuilder.setConnectionData(value);
81 } else {
82 sessionDescriptionBuilder.setConnectionData(value);
83 }
84 break;
85 case 's':
86 sessionDescriptionBuilder.setName(value);
87 break;
88 case 'a':
89 final Pair<String, String> attribute = parseAttribute(value);
90 attributeMap.put(attribute.first, attribute.second);
91 break;
92 case 'm':
93 if (currentMediaBuilder == null) {
94 sessionDescriptionBuilder.setAttributes(attributeMap);
95 ;
96 } else {
97 currentMediaBuilder.setAttributes(attributeMap);
98 mediaBuilder.add(currentMediaBuilder.createMedia());
99 }
100 attributeMap = ArrayListMultimap.create();
101 currentMediaBuilder = new MediaBuilder();
102 final String[] parts = value.split(" ");
103 if (parts.length >= 3) {
104 currentMediaBuilder.setMedia(parts[0]);
105 currentMediaBuilder.setPort(ignorantIntParser(parts[1]));
106 currentMediaBuilder.setProtocol(parts[2]);
107 ImmutableList.Builder<Integer> formats = new ImmutableList.Builder<>();
108 for (int i = 3; i < parts.length; ++i) {
109 formats.add(ignorantIntParser(parts[i]));
110 }
111 currentMediaBuilder.setFormats(formats.build());
112 } else {
113 Log.d(Config.LOGTAG, "skipping media line " + line);
114 }
115 break;
116 }
117
118 }
119 if (currentMediaBuilder != null) {
120 currentMediaBuilder.setAttributes(attributeMap);
121 mediaBuilder.add(currentMediaBuilder.createMedia());
122 } else {
123 sessionDescriptionBuilder.setAttributes(attributeMap);
124 }
125 sessionDescriptionBuilder.setMedia(mediaBuilder.build());
126 return sessionDescriptionBuilder.createSessionDescription();
127 }
128
129 public static SessionDescription of(final RtpContentMap contentMap) {
130 final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder();
131 final ArrayListMultimap<String, String> attributeMap = ArrayListMultimap.create();
132 final ImmutableList.Builder<Media> mediaListBuilder = new ImmutableList.Builder<>();
133 final Group group = contentMap.group;
134 if (group != null) {
135 final String semantics = group.getSemantics();
136 checkNoWhitespace(semantics, "group semantics value must not contain any whitespace");
137 attributeMap.put("group", group.getSemantics() + " " + Joiner.on(' ').join(group.getIdentificationTags()));
138 }
139
140 attributeMap.put("msid-semantic", " WMS my-media-stream");
141
142 for (final Map.Entry<String, RtpContentMap.DescriptionTransport> entry : contentMap.contents.entrySet()) {
143 final String name = entry.getKey();
144 RtpContentMap.DescriptionTransport descriptionTransport = entry.getValue();
145 RtpDescription description = descriptionTransport.description;
146 IceUdpTransportInfo transport = descriptionTransport.transport;
147 final ArrayListMultimap<String, String> mediaAttributes = ArrayListMultimap.create();
148 final String ufrag = transport.getAttribute("ufrag");
149 final String pwd = transport.getAttribute("pwd");
150 if (!Strings.isNullOrEmpty(ufrag)) {
151 mediaAttributes.put("ice-ufrag", ufrag);
152 }
153 checkNoWhitespace(ufrag, "ufrag value must not contain any whitespaces");
154 if (!Strings.isNullOrEmpty(pwd)) {
155 mediaAttributes.put("ice-pwd", pwd);
156 }
157 checkNoWhitespace(pwd, "pwd value must not contain any whitespaces");
158 mediaAttributes.put("ice-options", HARDCODED_ICE_OPTIONS);
159 final IceUdpTransportInfo.Fingerprint fingerprint = transport.getFingerprint();
160 if (fingerprint != null) {
161 mediaAttributes.put("fingerprint", fingerprint.getHash() + " " + fingerprint.getContent());
162 mediaAttributes.put("setup", fingerprint.getSetup());
163 }
164 final ImmutableList.Builder<Integer> formatBuilder = new ImmutableList.Builder<>();
165 for (RtpDescription.PayloadType payloadType : description.getPayloadTypes()) {
166 final String id = payloadType.getId();
167 if (Strings.isNullOrEmpty(id)) {
168 throw new IllegalArgumentException("Payload type is missing id");
169 }
170 if (!isInt(id)) {
171 throw new IllegalArgumentException("Payload id is not numeric");
172 }
173 formatBuilder.add(payloadType.getIntId());
174 mediaAttributes.put("rtpmap", payloadType.toSdpAttribute());
175 List<RtpDescription.Parameter> parameters = payloadType.getParameters();
176 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 mediaAttributes.put("rtcp-mux", "");
255
256 final MediaBuilder mediaBuilder = new MediaBuilder();
257 mediaBuilder.setMedia(description.getMedia().toString().toLowerCase(Locale.ROOT));
258 mediaBuilder.setConnectionData(HARDCODED_CONNECTION);
259 mediaBuilder.setPort(HARDCODED_MEDIA_PORT);
260 mediaBuilder.setProtocol(HARDCODED_MEDIA_PROTOCOL);
261 mediaBuilder.setAttributes(mediaAttributes);
262 mediaBuilder.setFormats(formatBuilder.build());
263 mediaListBuilder.add(mediaBuilder.createMedia());
264
265 }
266 sessionDescriptionBuilder.setVersion(0);
267 sessionDescriptionBuilder.setName("-");
268 sessionDescriptionBuilder.setMedia(mediaListBuilder.build());
269 sessionDescriptionBuilder.setAttributes(attributeMap);
270
271 return sessionDescriptionBuilder.createSessionDescription();
272 }
273
274 public static String checkNoWhitespace(final String input, final String message) {
275 if (CharMatcher.whitespace().matchesAnyOf(input)) {
276 throw new IllegalArgumentException(message);
277 }
278 return input;
279 }
280
281 public static int ignorantIntParser(final String input) {
282 try {
283 return Integer.parseInt(input);
284 } catch (NumberFormatException e) {
285 return 0;
286 }
287 }
288
289 public static boolean isInt(final String input) {
290 if (input == null) {
291 return false;
292 }
293 try {
294 Integer.parseInt(input);
295 return true;
296 } catch (NumberFormatException e) {
297 return false;
298 }
299 }
300
301 public static Pair<String, String> parseAttribute(final String input) {
302 final String[] pair = input.split(":", 2);
303 if (pair.length == 2) {
304 return new Pair<>(pair[0], pair[1]);
305 } else {
306 return new Pair<>(pair[0], "");
307 }
308 }
309
310 @Override
311 public String toString() {
312 final StringBuilder s = new StringBuilder()
313 .append("v=").append(version).append(LINE_DIVIDER)
314 //TODO randomize or static
315 .append("o=- 8770656990916039506 2 IN IP4 127.0.0.1").append(LINE_DIVIDER) //what ever that means
316 .append("s=").append(name).append(LINE_DIVIDER)
317 .append("t=0 0").append(LINE_DIVIDER);
318 appendAttributes(s, attributes);
319 for (Media media : this.media) {
320 s.append("m=").append(media.media).append(' ').append(media.port).append(' ').append(media.protocol).append(' ').append(Joiner.on(' ').join(media.formats)).append(LINE_DIVIDER);
321 s.append("c=").append(media.connectionData).append(LINE_DIVIDER);
322 appendAttributes(s, media.attributes);
323 }
324 return s.toString();
325 }
326
327 public static class Media {
328 public final String media;
329 public final int port;
330 public final String protocol;
331 public final List<Integer> formats;
332 public final String connectionData;
333 public final ArrayListMultimap<String, String> attributes;
334
335 public Media(String media, int port, String protocol, List<Integer> formats, String connectionData, ArrayListMultimap<String, String> attributes) {
336 this.media = media;
337 this.port = port;
338 this.protocol = protocol;
339 this.formats = formats;
340 this.connectionData = connectionData;
341 this.attributes = attributes;
342 }
343 }
344
345}