1package eu.siacs.conversations.entities;
2
3import android.content.ContentValues;
4import android.database.Cursor;
5import android.util.Base64;
6
7import androidx.annotation.NonNull;
8
9import com.google.common.base.Strings;
10
11import org.json.JSONArray;
12import org.json.JSONException;
13import org.json.JSONObject;
14
15import java.nio.charset.StandardCharsets;
16import java.security.MessageDigest;
17import java.security.NoSuchAlgorithmException;
18import java.util.ArrayList;
19import java.util.Collections;
20import java.util.List;
21
22import eu.siacs.conversations.xml.Element;
23import eu.siacs.conversations.xml.Namespace;
24import eu.siacs.conversations.xmpp.forms.Data;
25import eu.siacs.conversations.xmpp.forms.Field;
26import eu.siacs.conversations.xmpp.stanzas.IqPacket;
27
28public class ServiceDiscoveryResult {
29 public static final String TABLENAME = "discovery_results";
30 public static final String HASH = "hash";
31 public static final String VER = "ver";
32 public static final String RESULT = "result";
33 protected final String hash;
34 protected final byte[] ver;
35 protected final List<String> features;
36 protected final List<Data> forms;
37 private final List<Identity> identities;
38 public ServiceDiscoveryResult(final IqPacket packet) {
39 this.identities = new ArrayList<>();
40 this.features = new ArrayList<>();
41 this.forms = new ArrayList<>();
42 this.hash = "sha-1"; // We only support sha-1 for now
43
44 final List<Element> elements = packet.query().getChildren();
45
46 for (final Element element : elements) {
47 if (element.getName().equals("identity")) {
48 Identity id = new Identity(element);
49 if (id.getType() != null && id.getCategory() != null) {
50 identities.add(id);
51 }
52 } else if (element.getName().equals("feature")) {
53 if (element.getAttribute("var") != null) {
54 features.add(element.getAttribute("var"));
55 }
56 } else if (element.getName().equals("x") && element.getAttribute("xmlns").equals(Namespace.DATA)) {
57 forms.add(Data.parse(element));
58 }
59 }
60 this.ver = this.mkCapHash();
61 }
62 private ServiceDiscoveryResult(String hash, byte[] ver, JSONObject o) throws JSONException {
63 this.identities = new ArrayList<>();
64 this.features = new ArrayList<>();
65 this.forms = new ArrayList<>();
66 this.hash = hash;
67 this.ver = ver;
68
69 JSONArray identities = o.optJSONArray("identities");
70 if (identities != null) {
71 for (int i = 0; i < identities.length(); i++) {
72 this.identities.add(new Identity(identities.getJSONObject(i)));
73 }
74 }
75 JSONArray features = o.optJSONArray("features");
76 if (features != null) {
77 for (int i = 0; i < features.length(); i++) {
78 this.features.add(features.getString(i));
79 }
80 }
81 JSONArray forms = o.optJSONArray("forms");
82 if (forms != null) {
83 for (int i = 0; i < forms.length(); i++) {
84 this.forms.add(createFormFromJSONObject(forms.getJSONObject(i)));
85 }
86 }
87 }
88
89 private ServiceDiscoveryResult() {
90 this.hash = "sha-1";
91 this.features = Collections.emptyList();
92 this.identities = Collections.emptyList();
93 this.ver = null;
94 this.forms = Collections.emptyList();
95 }
96
97 public static ServiceDiscoveryResult empty() {
98 return new ServiceDiscoveryResult();
99 }
100
101 public ServiceDiscoveryResult(Cursor cursor) throws JSONException {
102 this(
103 cursor.getString(cursor.getColumnIndex(HASH)),
104 Base64.decode(cursor.getString(cursor.getColumnIndex(VER)), Base64.DEFAULT),
105 new JSONObject(cursor.getString(cursor.getColumnIndex(RESULT)))
106 );
107 }
108
109 private static String clean(String s) {
110 return s.replace("<","<");
111 }
112
113 private static String blankNull(String s) {
114 return s == null ? "" : clean(s);
115 }
116
117 private static Data createFormFromJSONObject(JSONObject o) {
118 Data data = new Data();
119 JSONArray names = o.names();
120 for (int i = 0; i < names.length(); ++i) {
121 try {
122 String name = names.getString(i);
123 JSONArray jsonValues = o.getJSONArray(name);
124 ArrayList<String> values = new ArrayList<>(jsonValues.length());
125 for (int j = 0; j < jsonValues.length(); ++j) {
126 values.add(jsonValues.getString(j));
127 }
128 data.put(name, values);
129 } catch (Exception e) {
130 e.printStackTrace();
131 }
132 }
133 return data;
134 }
135
136 private static JSONObject createJSONFromForm(Data data) {
137 JSONObject object = new JSONObject();
138 for (Field field : data.getFields()) {
139 try {
140 JSONArray jsonValues = new JSONArray();
141 for (String value : field.getValues()) {
142 jsonValues.put(value);
143 }
144 object.put(field.getFieldName(), jsonValues);
145 } catch (Exception e) {
146 e.printStackTrace();
147 }
148 }
149 try {
150 JSONArray jsonValues = new JSONArray();
151 jsonValues.put(data.getFormType());
152 object.put(Data.FORM_TYPE, jsonValues);
153 } catch (Exception e) {
154 e.printStackTrace();
155 }
156 return object;
157 }
158
159 public String getVer() {
160 return Base64.encodeToString(this.ver, Base64.NO_WRAP);
161 }
162
163 public List<Identity> getIdentities() {
164 return this.identities;
165 }
166
167 public List<String> getFeatures() {
168 return this.features;
169 }
170
171 public boolean hasIdentity(String category, String type) {
172 for (Identity id : this.getIdentities()) {
173 if ((category == null || id.getCategory().equals(category)) &&
174 (type == null || id.getType().equals(type))) {
175 return true;
176 }
177 }
178
179 return false;
180 }
181
182 public String getExtendedDiscoInformation(String formType, String name) {
183 for (Data form : this.forms) {
184 if (formType.equals(form.getFormType())) {
185 for (Field field : form.getFields()) {
186 if (name.equals(field.getFieldName())) {
187 return field.getValue();
188 }
189 }
190 }
191 }
192 return null;
193 }
194
195 private byte[] mkCapHash() {
196 StringBuilder s = new StringBuilder();
197
198 List<Identity> identities = this.getIdentities();
199 Collections.sort(identities);
200
201 for (Identity id : identities) {
202 s.append(blankNull(id.getCategory()))
203 .append("/")
204 .append(blankNull(id.getType()))
205 .append("/")
206 .append(blankNull(id.getLang()))
207 .append("/")
208 .append(blankNull(id.getName()))
209 .append("<");
210 }
211
212 List<String> features = this.getFeatures();
213 Collections.sort(features);
214
215 for (String feature : features) {
216 s.append(clean(feature)).append("<");
217 }
218
219 Collections.sort(forms, (lhs, rhs) -> lhs.getFormType().compareTo(rhs.getFormType()));
220
221 for (Data form : forms) {
222 s.append(clean(form.getFormType())).append("<");
223 List<Field> fields = form.getFields();
224 Collections.sort(fields, (lhs, rhs) -> Strings.nullToEmpty(lhs.getFieldName()).compareTo(Strings.nullToEmpty(rhs.getFieldName())));
225 for (Field field : fields) {
226 s.append(Strings.nullToEmpty(field.getFieldName())).append("<");
227 List<String> values = field.getValues();
228 Collections.sort(values);
229 for (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 {
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
300 Identity(final JSONObject o) {
301
302 this(
303 o.optString("category", null),
304 o.optString("type", null),
305 o.optString("lang", null),
306 o.optString("name", null)
307 );
308 }
309
310 public String getCategory() {
311 return this.category;
312 }
313
314 public String getType() {
315 return this.type;
316 }
317
318 public String getLang() {
319 return this.lang;
320 }
321
322 public String getName() {
323 return this.name;
324 }
325
326 public int compareTo(@NonNull Object other) {
327 Identity o = (Identity) other;
328 int r = blankNull(this.getCategory()).compareTo(blankNull(o.getCategory()));
329 if (r == 0) {
330 r = blankNull(this.getType()).compareTo(blankNull(o.getType()));
331 }
332 if (r == 0) {
333 r = blankNull(this.getLang()).compareTo(blankNull(o.getLang()));
334 }
335 if (r == 0) {
336 r = blankNull(this.getName()).compareTo(blankNull(o.getName()));
337 }
338
339 return r;
340 }
341
342 JSONObject toJSON() {
343 try {
344 JSONObject o = new JSONObject();
345 o.put("category", this.getCategory());
346 o.put("type", this.getType());
347 o.put("lang", this.getLang());
348 o.put("name", this.getName());
349 return o;
350 } catch (JSONException e) {
351 return null;
352 }
353 }
354 }
355}