1package eu.siacs.conversations.http;
2
3import android.util.Log;
4
5import androidx.annotation.Nullable;
6
7import com.google.common.base.Strings;
8import com.google.common.io.ByteStreams;
9import com.google.common.primitives.Longs;
10
11import java.io.FileInputStream;
12import java.io.IOException;
13import java.io.InputStream;
14import java.io.OutputStream;
15import java.util.Locale;
16
17import javax.net.ssl.SSLHandshakeException;
18
19import eu.siacs.conversations.Config;
20import eu.siacs.conversations.R;
21import eu.siacs.conversations.entities.DownloadableFile;
22import eu.siacs.conversations.entities.Message;
23import eu.siacs.conversations.entities.Transferable;
24import eu.siacs.conversations.persistance.FileBackend;
25import eu.siacs.conversations.services.AbstractConnectionManager;
26import eu.siacs.conversations.services.XmppConnectionService;
27import eu.siacs.conversations.utils.CryptoHelper;
28import eu.siacs.conversations.utils.FileWriterException;
29import eu.siacs.conversations.utils.MimeUtils;
30import okhttp3.Call;
31import okhttp3.HttpUrl;
32import okhttp3.OkHttpClient;
33import okhttp3.Request;
34import okhttp3.Response;
35
36import static eu.siacs.conversations.http.HttpConnectionManager.EXECUTOR;
37
38public class HttpDownloadConnection implements Transferable {
39
40 private final Message message;
41 private final HttpConnectionManager mHttpConnectionManager;
42 private final XmppConnectionService mXmppConnectionService;
43 private HttpUrl mUrl;
44 private DownloadableFile file;
45 private int mStatus = Transferable.STATUS_UNKNOWN;
46 private boolean acceptedAutomatically = false;
47 private int mProgress = 0;
48 private Call mostRecentCall;
49
50 HttpDownloadConnection(Message message, HttpConnectionManager manager) {
51 this.message = message;
52 this.mHttpConnectionManager = manager;
53 this.mXmppConnectionService = manager.getXmppConnectionService();
54 }
55
56 @Override
57 public boolean start() {
58 if (mXmppConnectionService.hasInternetConnection()) {
59 if (this.mStatus == STATUS_OFFER_CHECK_FILESIZE) {
60 checkFileSize(true);
61 } else {
62 download(true);
63 }
64 return true;
65 } else {
66 return false;
67 }
68 }
69
70 public void init(boolean interactive) {
71 if (message.isDeleted()) {
72 if (message.getType() == Message.TYPE_PRIVATE_FILE) {
73 message.setType(Message.TYPE_PRIVATE);
74 } else if (message.isFileOrImage()) {
75 message.setType(Message.TYPE_TEXT);
76 }
77 message.setOob(true);
78 message.setDeleted(false);
79 mXmppConnectionService.updateMessage(message);
80 }
81 this.message.setTransferable(this);
82 try {
83 final Message.FileParams fileParams = message.getFileParams();
84 if (message.hasFileOnRemoteHost()) {
85 mUrl = AesGcmURL.of(fileParams.url);
86 } else if (message.isOOb() && fileParams.url != null && fileParams.size != null) {
87 mUrl = AesGcmURL.of(fileParams.url);
88 } else {
89 mUrl = AesGcmURL.of(message.getBody().split("\n")[0]);
90 }
91 final AbstractConnectionManager.Extension extension = AbstractConnectionManager.Extension.of(mUrl.encodedPath());
92 if (VALID_CRYPTO_EXTENSIONS.contains(extension.main)) {
93 this.message.setEncryption(Message.ENCRYPTION_PGP);
94 } else if (message.getEncryption() != Message.ENCRYPTION_OTR
95 && message.getEncryption() != Message.ENCRYPTION_AXOLOTL) {
96 this.message.setEncryption(Message.ENCRYPTION_NONE);
97 }
98 final String ext = extension.getExtension();
99 if (ext != null) {
100 message.setRelativeFilePath(String.format("%s.%s", message.getUuid(), ext));
101 } else if (Strings.isNullOrEmpty(message.getRelativeFilePath())) {
102 message.setRelativeFilePath(message.getUuid());
103 }
104 setupFile();
105 if (this.message.getEncryption() == Message.ENCRYPTION_AXOLOTL && this.file.getKey() == null) {
106 this.message.setEncryption(Message.ENCRYPTION_NONE);
107 }
108 //TODO add auth tag size to knownFileSize
109 final Long knownFileSize = message.getFileParams().size;
110 Log.d(Config.LOGTAG,"knownFileSize: "+knownFileSize+", body="+message.getBody());
111 if (knownFileSize != null && interactive) {
112 this.file.setExpectedSize(knownFileSize);
113 download(true);
114 } else {
115 checkFileSize(interactive);
116 }
117 } catch (final IllegalArgumentException e) {
118 this.cancel();
119 }
120 }
121
122 private void setupFile() {
123 final String reference = mUrl.fragment();
124 if (reference != null && AesGcmURL.IV_KEY.matcher(reference).matches()) {
125 this.file = new DownloadableFile(mXmppConnectionService.getCacheDir().getAbsolutePath() + "/" + message.getUuid());
126 this.file.setKeyAndIv(CryptoHelper.hexToBytes(reference));
127 Log.d(Config.LOGTAG, "create temporary OMEMO encrypted file: " + this.file.getAbsolutePath() + "(" + message.getMimeType() + ")");
128 } else {
129 this.file = mXmppConnectionService.getFileBackend().getFile(message, false);
130 }
131 }
132
133 private void download(final boolean interactive) {
134 Log.d(Config.LOGTAG,"download()",new Exception());
135 EXECUTOR.execute(new FileDownloader(interactive));
136 }
137
138 private void checkFileSize(final boolean interactive) {
139 EXECUTOR.execute(new FileSizeChecker(interactive));
140 }
141
142 @Override
143 public void cancel() {
144 final Call call = this.mostRecentCall;
145 if (call != null && !call.isCanceled()) {
146 call.cancel();
147 }
148 mHttpConnectionManager.finishConnection(this);
149 message.setTransferable(null);
150 if (message.isFileOrImage()) {
151 message.setDeleted(true);
152 }
153 mHttpConnectionManager.updateConversationUi(true);
154 }
155
156 private void decryptFile() throws IOException {
157 final DownloadableFile outputFile = mXmppConnectionService.getFileBackend().getFile(message, true);
158
159 if (outputFile.getParentFile().mkdirs()) {
160 Log.d(Config.LOGTAG, "created parent directories for " + outputFile.getAbsolutePath());
161 }
162
163 if (!outputFile.createNewFile()) {
164 Log.w(Config.LOGTAG, "unable to create output file " + outputFile.getAbsolutePath());
165 }
166
167 final InputStream is = new FileInputStream(this.file);
168
169 outputFile.setKey(this.file.getKey());
170 outputFile.setIv(this.file.getIv());
171 final OutputStream os = AbstractConnectionManager.createOutputStream(outputFile, false, true);
172
173 ByteStreams.copy(is, os);
174
175 FileBackend.close(is);
176 FileBackend.close(os);
177
178 if (!file.delete()) {
179 Log.w(Config.LOGTAG, "unable to delete temporary OMEMO encrypted file " + file.getAbsolutePath());
180 }
181 }
182
183 private void finish() {
184 message.setTransferable(null);
185 mHttpConnectionManager.finishConnection(this);
186 boolean notify = acceptedAutomatically && !message.isRead();
187 if (message.getEncryption() == Message.ENCRYPTION_PGP) {
188 notify = message.getConversation().getAccount().getPgpDecryptionService().decrypt(message, notify);
189 }
190 mHttpConnectionManager.updateConversationUi(true);
191 final boolean notifyAfterScan = notify;
192 final DownloadableFile file = mXmppConnectionService.getFileBackend().getFile(message, true);
193 mXmppConnectionService.getFileBackend().updateMediaScanner(file, () -> {
194 if (notifyAfterScan) {
195 mXmppConnectionService.getNotificationService().push(message);
196 }
197 });
198 }
199
200 private void decryptIfNeeded() throws IOException {
201 if (file.getKey() != null && file.getIv() != null) {
202 decryptFile();
203 }
204 }
205
206 private void changeStatus(int status) {
207 this.mStatus = status;
208 mHttpConnectionManager.updateConversationUi(true);
209 }
210
211 private void showToastForException(final Exception e) {
212 final Call call = mostRecentCall;
213 final boolean cancelled = call != null && call.isCanceled();
214 if (e == null || cancelled) {
215 return;
216 }
217 if (e instanceof java.net.UnknownHostException) {
218 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_server_not_found);
219 } else if (e instanceof java.net.ConnectException) {
220 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_could_not_connect);
221 } else if (e instanceof FileWriterException) {
222 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_could_not_write_file);
223 } else {
224 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_file_not_found);
225 }
226 }
227
228 private void updateProgress(long i) {
229 this.mProgress = (int) i;
230 mHttpConnectionManager.updateConversationUi(false);
231 }
232
233 @Override
234 public int getStatus() {
235 return this.mStatus;
236 }
237
238 @Override
239 public Long getFileSize() {
240 if (this.file != null) {
241 return this.file.getExpectedSize();
242 } else {
243 return null;
244 }
245 }
246
247 @Override
248 public int getProgress() {
249 return this.mProgress;
250 }
251
252 public Message getMessage() {
253 return message;
254 }
255
256 private class FileSizeChecker implements Runnable {
257
258 private final boolean interactive;
259
260 FileSizeChecker(boolean interactive) {
261 this.interactive = interactive;
262 }
263
264
265 @Override
266 public void run() {
267 check();
268 }
269
270 private void retrieveFailed(@Nullable final Exception e) {
271 changeStatus(STATUS_OFFER_CHECK_FILESIZE);
272 if (interactive) {
273 showToastForException(e);
274 } else {
275 HttpDownloadConnection.this.acceptedAutomatically = false;
276 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
277 }
278 cancel();
279 }
280
281 private void check() {
282 long size;
283 try {
284 size = retrieveFileSize();
285 } catch (final Exception e) {
286 Log.d(Config.LOGTAG, "io exception in http file size checker: " + e.getMessage());
287 retrieveFailed(e);
288 return;
289 }
290 final Message.FileParams fileParams = message.getFileParams();
291 FileBackend.updateFileParams(message, fileParams.url, size);
292 message.setOob(true);
293 mXmppConnectionService.databaseBackend.updateMessage(message, true);
294 file.setExpectedSize(size);
295 message.resetFileParams();
296 if (mHttpConnectionManager.hasStoragePermission()
297 && size <= mHttpConnectionManager.getAutoAcceptFileSize()
298 && mXmppConnectionService.isDataSaverDisabled()) {
299 HttpDownloadConnection.this.acceptedAutomatically = true;
300 download(interactive);
301 } else {
302 changeStatus(STATUS_OFFER);
303 HttpDownloadConnection.this.acceptedAutomatically = false;
304 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
305 }
306 }
307
308 private long retrieveFileSize() throws IOException {
309 Log.d(Config.LOGTAG, "retrieve file size. interactive:" + interactive);
310 changeStatus(STATUS_CHECKING);
311 final OkHttpClient client = mHttpConnectionManager.buildHttpClient(
312 mUrl,
313 message.getConversation().getAccount(),
314 interactive
315 );
316 final Request request = new Request.Builder()
317 .url(URL.stripFragment(mUrl))
318 .head()
319 .build();
320 mostRecentCall = client.newCall(request);
321 try {
322 final Response response = mostRecentCall.execute();
323 throwOnInvalidCode(response);
324 final String contentLength = response.header("Content-Length");
325 final String contentType = response.header("Content-Type");
326 final AbstractConnectionManager.Extension extension = AbstractConnectionManager.Extension.of(mUrl.encodedPath());
327 if (Strings.isNullOrEmpty(extension.getExtension()) && contentType != null) {
328 final String fileExtension = MimeUtils.guessExtensionFromMimeType(contentType);
329 if (fileExtension != null) {
330 message.setRelativeFilePath(String.format("%s.%s", message.getUuid(), fileExtension));
331 Log.d(Config.LOGTAG, "rewriting name after not finding extension in url but in content type");
332 setupFile();
333 }
334 }
335 if (Strings.isNullOrEmpty(contentLength)) {
336 throw new IOException("no content-length found in HEAD response");
337 }
338 final long size = Long.parseLong(contentLength, 10);
339 if (size < 0) {
340 throw new IOException("Server reported negative file size");
341 }
342 return size;
343 } catch (IOException e) {
344 Log.d(Config.LOGTAG, "io exception during HEAD " + e.getMessage());
345 throw e;
346 } catch (NumberFormatException e) {
347 throw new IOException();
348 }
349 }
350
351 }
352
353 private class FileDownloader implements Runnable {
354
355 private final boolean interactive;
356
357 public FileDownloader(boolean interactive) {
358 this.interactive = interactive;
359 }
360
361 @Override
362 public void run() {
363 try {
364 changeStatus(STATUS_DOWNLOADING);
365 download();
366 decryptIfNeeded();
367 updateImageBounds();
368 finish();
369 } catch (final SSLHandshakeException e) {
370 changeStatus(STATUS_OFFER);
371 } catch (final Exception e) {
372 Log.d(Config.LOGTAG, message.getConversation().getAccount().getJid().asBareJid() + ": unable to download file", e);
373 if (interactive) {
374 showToastForException(e);
375 } else {
376 HttpDownloadConnection.this.acceptedAutomatically = false;
377 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
378 }
379 cancel();
380 }
381 }
382
383 private void download() throws Exception {
384 final OkHttpClient client = mHttpConnectionManager.buildHttpClient(
385 mUrl,
386 message.getConversation().getAccount(),
387 interactive
388 );
389
390 final Request.Builder requestBuilder = new Request.Builder().url(URL.stripFragment(mUrl));
391
392 final long expected = file.getExpectedSize();
393 final boolean tryResume = file.exists() && file.getSize() > 0 && file.getSize() < expected;
394 final long resumeSize;
395 if (tryResume) {
396 resumeSize = file.getSize();
397 Log.d(Config.LOGTAG, "http download trying resume after " + resumeSize + " of " + expected);
398 requestBuilder.addHeader("Range", String.format(Locale.ENGLISH, "bytes=%d-", resumeSize));
399 } else {
400 resumeSize = 0;
401 }
402 final Request request = requestBuilder.build();
403 mostRecentCall = client.newCall(request);
404 final Response response = mostRecentCall.execute();
405 throwOnInvalidCode(response);
406 final String contentRange = response.header("Content-Range");
407 final boolean serverResumed = tryResume && contentRange != null && contentRange.startsWith("bytes " + resumeSize + "-");
408 final InputStream inputStream = response.body().byteStream();
409 final OutputStream outputStream;
410 long transmitted = 0;
411 if (tryResume && serverResumed) {
412 Log.d(Config.LOGTAG, "server resumed");
413 transmitted = file.getSize();
414 updateProgress(Math.round(((double) transmitted / expected) * 100));
415 outputStream = AbstractConnectionManager.createOutputStream(file, true, false);
416 } else {
417 final String contentLength = response.header("Content-Length");
418 final long size = Strings.isNullOrEmpty(contentLength) ? 0 : Longs.tryParse(contentLength);
419 if (expected != size) {
420 Log.d(Config.LOGTAG, "content-length reported on GET (" + size + ") did not match Content-Length reported on HEAD (" + expected + ")");
421 }
422 file.getParentFile().mkdirs();
423 if (!file.exists() && !file.createNewFile()) {
424 throw new FileWriterException();
425 }
426 outputStream = AbstractConnectionManager.createOutputStream(file, false, false);
427 }
428 int count;
429 final byte[] buffer = new byte[4096];
430 while ((count = inputStream.read(buffer)) != -1) {
431 transmitted += count;
432 try {
433 outputStream.write(buffer, 0, count);
434 } catch (IOException e) {
435 throw new FileWriterException();
436 }
437 updateProgress(Math.round(((double) transmitted / expected) * 100));
438 }
439 outputStream.flush();
440 }
441
442 private void updateImageBounds() {
443 final boolean privateMessage = message.isPrivateMessage();
444 message.setType(privateMessage ? Message.TYPE_PRIVATE_FILE : Message.TYPE_FILE);
445 final String url;
446 final String ref = mUrl.fragment();
447 if (ref != null && AesGcmURL.IV_KEY.matcher(ref).matches()) {
448 url = AesGcmURL.toAesGcmUrl(mUrl);
449 } else {
450 url = mUrl.toString();
451 }
452 mXmppConnectionService.getFileBackend().updateFileParams(message, url);
453 mXmppConnectionService.updateMessage(message);
454 }
455
456 }
457
458 private static void throwOnInvalidCode(final Response response) throws IOException {
459 final int code = response.code();
460 if (code < 200 || code >= 300) {
461 throw new IOException(String.format(Locale.ENGLISH, "HTTP Status code was %d", code));
462 }
463 }
464}