1package eu.siacs.conversations.entities;
2
3import android.content.ContentValues;
4import android.database.Cursor;
5import android.util.Base64;
6import com.google.common.base.Strings;
7import eu.siacs.conversations.xml.Element;
8import eu.siacs.conversations.xml.Namespace;
9import eu.siacs.conversations.xmpp.forms.Data;
10import eu.siacs.conversations.xmpp.forms.Field;
11import im.conversations.android.xmpp.model.stanza.Iq;
12import java.nio.charset.StandardCharsets;
13import java.security.MessageDigest;
14import java.security.NoSuchAlgorithmException;
15import java.util.ArrayList;
16import java.util.Collections;
17import java.util.Comparator;
18import java.util.List;
19import org.json.JSONArray;
20import org.json.JSONException;
21import org.json.JSONObject;
22
23public class ServiceDiscoveryResult {
24 public static final String TABLENAME = "discovery_results";
25 public static final String HASH = "hash";
26 public static final String VER = "ver";
27 public static final String RESULT = "result";
28 protected final String hash;
29 protected final byte[] ver;
30 protected final List<String> features;
31 protected final List<Data> forms;
32 private final List<Identity> identities;
33
34 public ServiceDiscoveryResult(final Iq packet) {
35 this.identities = new ArrayList<>();
36 this.features = new ArrayList<>();
37 this.forms = new ArrayList<>();
38 this.hash = "sha-1"; // We only support sha-1 for now
39
40 final List<Element> elements = packet.query().getChildren();
41
42 for (final Element element : elements) {
43 if (element.getName().equals("identity")) {
44 Identity id = new Identity(element);
45 if (id.getType() != null && id.getCategory() != null) {
46 identities.add(id);
47 }
48 } else if (element.getName().equals("feature")) {
49 if (element.getAttribute("var") != null) {
50 features.add(element.getAttribute("var"));
51 }
52 } else if (element.getName().equals("x")
53 && element.getAttribute("xmlns").equals(Namespace.DATA)) {
54 forms.add(Data.parse(element));
55 }
56 }
57 this.ver = this.mkCapHash();
58 }
59
60 private ServiceDiscoveryResult(String hash, byte[] ver, JSONObject o) throws JSONException {
61 this.identities = new ArrayList<>();
62 this.features = new ArrayList<>();
63 this.forms = new ArrayList<>();
64 this.hash = hash;
65 this.ver = ver;
66
67 JSONArray identities = o.optJSONArray("identities");
68 if (identities != null) {
69 for (int i = 0; i < identities.length(); i++) {
70 this.identities.add(new Identity(identities.getJSONObject(i)));
71 }
72 }
73 JSONArray features = o.optJSONArray("features");
74 if (features != null) {
75 for (int i = 0; i < features.length(); i++) {
76 this.features.add(features.getString(i));
77 }
78 }
79 JSONArray forms = o.optJSONArray("forms");
80 if (forms != null) {
81 for (int i = 0; i < forms.length(); i++) {
82 this.forms.add(createFormFromJSONObject(forms.getJSONObject(i)));
83 }
84 }
85 }
86
87 private ServiceDiscoveryResult() {
88 this.hash = "sha-1";
89 this.features = Collections.emptyList();
90 this.identities = Collections.emptyList();
91 this.ver = null;
92 this.forms = Collections.emptyList();
93 }
94
95 public static ServiceDiscoveryResult empty() {
96 return new ServiceDiscoveryResult();
97 }
98
99 public ServiceDiscoveryResult(Cursor cursor) throws JSONException {
100 this(
101 cursor.getString(cursor.getColumnIndexOrThrow(HASH)),
102 Base64.decode(cursor.getString(cursor.getColumnIndexOrThrow(VER)), Base64.DEFAULT),
103 new JSONObject(cursor.getString(cursor.getColumnIndexOrThrow(RESULT))));
104 }
105
106 private static String clean(String s) {
107 return s.replace("<", "<");
108 }
109
110 private static String blankNull(String s) {
111 return s == null ? "" : clean(s);
112 }
113
114 private static Data createFormFromJSONObject(JSONObject o) {
115 Data data = new Data();
116 JSONArray names = o.names();
117 for (int i = 0; i < names.length(); ++i) {
118 try {
119 String name = names.getString(i);
120 JSONArray jsonValues = o.getJSONArray(name);
121 ArrayList<String> values = new ArrayList<>(jsonValues.length());
122 for (int j = 0; j < jsonValues.length(); ++j) {
123 values.add(jsonValues.getString(j));
124 }
125 data.put(name, values);
126 } catch (Exception e) {
127 e.printStackTrace();
128 }
129 }
130 return data;
131 }
132
133 private static JSONObject createJSONFromForm(Data data) {
134 JSONObject object = new JSONObject();
135 for (Field field : data.getFields()) {
136 try {
137 JSONArray jsonValues = new JSONArray();
138 for (String value : field.getValues()) {
139 jsonValues.put(value);
140 }
141 object.put(field.getFieldName(), jsonValues);
142 } catch (Exception e) {
143 e.printStackTrace();
144 }
145 }
146 try {
147 JSONArray jsonValues = new JSONArray();
148 jsonValues.put(data.getFormType());
149 object.put(Data.FORM_TYPE, jsonValues);
150 } catch (Exception e) {
151 e.printStackTrace();
152 }
153 return object;
154 }
155
156 public Identity getIdentity(String category, String type) {
157 for (Identity id : this.getIdentities()) {
158 if ((category == null || id.getCategory().equals(category)) &&
159 (type == null || id.getType().equals(type))) {
160 return id;
161 }
162 }
163
164 return null;
165 }
166
167 public boolean hasIdentity(String category, String type) {
168 return getIdentity(category, type) != null;
169 }
170
171 public String getVer() {
172 return Base64.encodeToString(this.ver, Base64.NO_WRAP);
173 }
174
175 public List<Identity> getIdentities() {
176 return this.identities;
177 }
178
179 public List<String> getFeatures() {
180 return this.features;
181 }
182
183 public String getExtendedDiscoInformation(final String formType, final String name) {
184 for (final Data form : this.forms) {
185 if (formType.equals(form.getFormType())) {
186 for (final Field field : form.getFields()) {
187 if (name.equals(field.getFieldName())) {
188 return field.getValue();
189 }
190 }
191 }
192 }
193 return null;
194 }
195
196 private byte[] mkCapHash() {
197 StringBuilder s = new StringBuilder();
198
199 List<Identity> identities = this.getIdentities();
200 Collections.sort(identities);
201
202 for (Identity id : identities) {
203 s.append(blankNull(id.getCategory()))
204 .append("/")
205 .append(blankNull(id.getType()))
206 .append("/")
207 .append(blankNull(id.getLang()))
208 .append("/")
209 .append(blankNull(id.getName()))
210 .append("<");
211 }
212
213 final List<String> features = this.getFeatures();
214 Collections.sort(features);
215 for (final String feature : features) {
216 s.append(clean(feature)).append("<");
217 }
218
219 Collections.sort(forms, Comparator.comparing(Data::getFormType));
220 for (final Data form : forms) {
221 s.append(clean(form.getFormType())).append("<");
222 final List<Field> fields = form.getFields();
223 Collections.sort(
224 fields, Comparator.comparing(lhs -> Strings.nullToEmpty(lhs.getFieldName())));
225 for (final Field field : fields) {
226 s.append(Strings.nullToEmpty(field.getFieldName())).append("<");
227 final List<String> values = field.getValues();
228 Collections.sort(values, Comparator.comparing(ServiceDiscoveryResult::blankNull));
229 for (final String value : values) {
230 s.append(blankNull(value)).append("<");
231 }
232 }
233 }
234
235 MessageDigest md;
236 try {
237 md = MessageDigest.getInstance("SHA-1");
238 } catch (NoSuchAlgorithmException e) {
239 return null;
240 }
241
242 return md.digest(s.toString().getBytes(StandardCharsets.UTF_8));
243 }
244
245 private JSONObject toJSON() {
246 try {
247 JSONObject o = new JSONObject();
248
249 JSONArray ids = new JSONArray();
250 for (Identity id : this.getIdentities()) {
251 ids.put(id.toJSON());
252 }
253 o.put("identities", ids);
254
255 o.put("features", new JSONArray(this.getFeatures()));
256
257 JSONArray forms = new JSONArray();
258 for (Data data : this.forms) {
259 forms.put(createJSONFromForm(data));
260 }
261 o.put("forms", forms);
262
263 return o;
264 } catch (JSONException e) {
265 return null;
266 }
267 }
268
269 public ContentValues getContentValues() {
270 final ContentValues values = new ContentValues();
271 values.put(HASH, this.hash);
272 values.put(VER, getVer());
273 JSONObject jsonObject = toJSON();
274 values.put(RESULT, jsonObject == null ? "" : jsonObject.toString());
275 return values;
276 }
277
278 public static class Identity implements Comparable<Identity> {
279 protected final String type;
280 protected final String lang;
281 protected final String name;
282 final String category;
283
284 Identity(final String category, final String type, final String lang, final String name) {
285 this.category = category;
286 this.type = type;
287 this.lang = lang;
288 this.name = name;
289 }
290
291 Identity(final Element el) {
292 this(
293 el.getAttribute("category"),
294 el.getAttribute("type"),
295 el.getAttribute("xml:lang"),
296 el.getAttribute("name"));
297 }
298
299 Identity(final JSONObject o) {
300
301 this(
302 o.optString("category", null),
303 o.optString("type", null),
304 o.optString("lang", null),
305 o.optString("name", null));
306 }
307
308 public String getCategory() {
309 return this.category;
310 }
311
312 public String getType() {
313 return this.type;
314 }
315
316 public String getLang() {
317 return this.lang;
318 }
319
320 public String getName() {
321 return this.name;
322 }
323
324 JSONObject toJSON() {
325 try {
326 JSONObject o = new JSONObject();
327 o.put("category", this.getCategory());
328 o.put("type", this.getType());
329 o.put("lang", this.getLang());
330 o.put("name", this.getName());
331 return o;
332 } catch (JSONException e) {
333 return null;
334 }
335 }
336
337 @Override
338 public int compareTo(final Identity o) {
339 int r = blankNull(this.getCategory()).compareTo(blankNull(o.getCategory()));
340 if (r == 0) {
341 r = blankNull(this.getType()).compareTo(blankNull(o.getType()));
342 }
343 if (r == 0) {
344 r = blankNull(this.getLang()).compareTo(blankNull(o.getLang()));
345 }
346 if (r == 0) {
347 r = blankNull(this.getName()).compareTo(blankNull(o.getName()));
348 }
349
350 return r;
351 }
352 }
353}