1package eu.siacs.conversations.http;
2
3import android.util.Log;
4
5import androidx.annotation.Nullable;
6import androidx.core.util.Consumer;
7
8import com.google.common.base.Strings;
9import com.google.common.io.ByteStreams;
10import com.google.common.primitives.Longs;
11
12import java.io.FileInputStream;
13import java.io.IOException;
14import java.io.InputStream;
15import java.io.OutputStream;
16import java.util.Locale;
17
18import javax.net.ssl.SSLHandshakeException;
19
20import eu.siacs.conversations.Config;
21import eu.siacs.conversations.R;
22import eu.siacs.conversations.entities.DownloadableFile;
23import eu.siacs.conversations.entities.Message;
24import eu.siacs.conversations.entities.Transferable;
25import eu.siacs.conversations.persistance.FileBackend;
26import eu.siacs.conversations.services.AbstractConnectionManager;
27import eu.siacs.conversations.services.XmppConnectionService;
28import eu.siacs.conversations.utils.CryptoHelper;
29import eu.siacs.conversations.utils.FileWriterException;
30import eu.siacs.conversations.utils.MimeUtils;
31import okhttp3.Call;
32import okhttp3.HttpUrl;
33import okhttp3.OkHttpClient;
34import okhttp3.Request;
35import okhttp3.Response;
36
37import static eu.siacs.conversations.http.HttpConnectionManager.EXECUTOR;
38
39public class HttpDownloadConnection implements Transferable {
40
41 private final Message message;
42 private final HttpConnectionManager mHttpConnectionManager;
43 private final XmppConnectionService mXmppConnectionService;
44 private HttpUrl mUrl;
45 private DownloadableFile file;
46 private int mStatus = Transferable.STATUS_UNKNOWN;
47 private boolean acceptedAutomatically = false;
48 private int mProgress = 0;
49 private Call mostRecentCall;
50 final private Consumer<DownloadableFile> cb;
51
52 HttpDownloadConnection(Message message, HttpConnectionManager manager, Consumer<DownloadableFile> cb) {
53 this.message = message;
54 this.mHttpConnectionManager = manager;
55 this.mXmppConnectionService = manager.getXmppConnectionService();
56 this.cb = cb;
57 }
58
59 @Override
60 public boolean start() {
61 if (mXmppConnectionService.hasInternetConnection()) {
62 if (this.mStatus == STATUS_OFFER_CHECK_FILESIZE) {
63 checkFileSize(true);
64 } else {
65 download(true);
66 }
67 return true;
68 } else {
69 return false;
70 }
71 }
72
73 public void init(boolean interactive) {
74 final Message.FileParams fileParams = message.getFileParams();
75 if (message.isDeleted()) {
76 if (message.getType() == Message.TYPE_PRIVATE_FILE) {
77 message.setType(Message.TYPE_PRIVATE);
78 } else if (message.isFileOrImage()) {
79 message.setType(Message.TYPE_TEXT);
80 }
81 message.setDeleted(false);
82 mXmppConnectionService.updateMessage(message);
83 }
84 this.message.setTransferable(this);
85 try {
86 if (message.hasFileOnRemoteHost()) {
87 mUrl = AesGcmURL.of(fileParams.url);
88 } else if (message.isOOb() && fileParams.url != null) {
89 mUrl = AesGcmURL.of(fileParams.url);
90 } else {
91 mUrl = AesGcmURL.of(message.getBody().split("\n")[0]);
92 }
93 final AbstractConnectionManager.Extension extension = AbstractConnectionManager.Extension.of(mUrl.encodedPath());
94 if (VALID_CRYPTO_EXTENSIONS.contains(extension.main)) {
95 this.message.setEncryption(Message.ENCRYPTION_PGP);
96 } else if (message.getEncryption() != Message.ENCRYPTION_OTR
97 && message.getEncryption() != Message.ENCRYPTION_AXOLOTL) {
98 this.message.setEncryption(Message.ENCRYPTION_NONE);
99 }
100 String ext = extension.getExtension();
101 if (ext == null && fileParams.getMediaType() != null) {
102 ext = MimeUtils.guessExtensionFromMimeType(fileParams.getMediaType());
103 }
104 final String filename = Strings.isNullOrEmpty(ext) ? message.getUuid() : String.format("%s.%s", message.getUuid(), ext);
105 mXmppConnectionService.getFileBackend().setupRelativeFilePath(message, filename);
106 setupFile();
107 if (this.message.getEncryption() == Message.ENCRYPTION_AXOLOTL && this.file.getKey() == null) {
108 this.message.setEncryption(Message.ENCRYPTION_NONE);
109 }
110 final Long knownFileSize;
111 if (message.getEncryption() == Message.ENCRYPTION_PGP || message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
112 knownFileSize = null;
113 } else {
114 knownFileSize = message.getFileParams().size;
115 }
116 Log.d(Config.LOGTAG,"knownFileSize: "+knownFileSize+", body="+message.getBody());
117 if (knownFileSize != null && interactive) {
118 if (message.getEncryption() == Message.ENCRYPTION_AXOLOTL
119 && this.file.getKey() != null) {
120 this.file.setExpectedSize(knownFileSize + 16);
121 } else {
122 this.file.setExpectedSize(knownFileSize);
123 }
124 download(true);
125 } else {
126 checkFileSize(interactive);
127 }
128 } catch (final IllegalArgumentException e) {
129 this.cancel();
130 }
131 }
132
133 private void setupFile() {
134 final String reference = mUrl.fragment();
135 if (reference != null && AesGcmURL.IV_KEY.matcher(reference).matches()) {
136 this.file = new DownloadableFile(mXmppConnectionService.getCacheDir(), message.getUuid());
137 this.file.setKeyAndIv(CryptoHelper.hexToBytes(reference));
138 Log.d(Config.LOGTAG, "create temporary OMEMO encrypted file: " + this.file.getAbsolutePath() + "(" + message.getMimeType() + ")");
139 } else {
140 this.file = mXmppConnectionService.getFileBackend().getFile(message, false);
141 }
142 }
143
144 private void download(final boolean interactive) {
145 EXECUTOR.execute(new FileDownloader(interactive));
146 }
147
148 private void checkFileSize(final boolean interactive) {
149 EXECUTOR.execute(new FileSizeChecker(interactive));
150 }
151
152 @Override
153 public void cancel() {
154 final Call call = this.mostRecentCall;
155 if (call != null && !call.isCanceled()) {
156 call.cancel();
157 }
158 mHttpConnectionManager.finishConnection(this);
159 message.setTransferable(null);
160 if (message.isFileOrImage()) {
161 message.setDeleted(true);
162 }
163 mHttpConnectionManager.updateConversationUi(true);
164 }
165
166 private void decryptFile() throws IOException {
167 final DownloadableFile outputFile = mXmppConnectionService.getFileBackend().getFile(message, true);
168
169 if (outputFile.getParentFile().mkdirs()) {
170 Log.d(Config.LOGTAG, "created parent directories for " + outputFile.getAbsolutePath());
171 }
172
173 if (!outputFile.createNewFile()) {
174 Log.w(Config.LOGTAG, "unable to create output file " + outputFile.getAbsolutePath());
175 }
176
177 final InputStream is = new FileInputStream(this.file);
178
179 outputFile.setKey(this.file.getKey());
180 outputFile.setIv(this.file.getIv());
181 final OutputStream os = AbstractConnectionManager.createOutputStream(outputFile, false, true);
182
183 ByteStreams.copy(is, os);
184
185 FileBackend.close(is);
186 FileBackend.close(os);
187
188 if (!file.delete()) {
189 Log.w(Config.LOGTAG, "unable to delete temporary OMEMO encrypted file " + file.getAbsolutePath());
190 }
191 }
192
193 private void finish() {
194 boolean notify = acceptedAutomatically && !message.isRead() && cb == null;
195 if (message.getEncryption() == Message.ENCRYPTION_PGP) {
196 notify = message.getConversation().getAccount().getPgpDecryptionService().decrypt(message, notify);
197 }
198 final DownloadableFile tmp = file;
199 final String extension = MimeUtils.extractRelevantExtension(tmp.getName());
200 try {
201 mXmppConnectionService.getFileBackend().setupRelativeFilePath(message, new FileInputStream(tmp), extension);
202 file = mXmppConnectionService.getFileBackend().getFile(message);
203 boolean didRename = tmp.renameTo(file);
204 if (!didRename) throw new IOException("rename failed");
205 } catch (final IOException e) {
206 Log.w(Config.LOGTAG, "Failed to rename downloaded file: " + e);
207 file = tmp;
208 message.setRelativeFilePath(file.getAbsolutePath());
209 } catch (final XmppConnectionService.BlockedMediaException e) {
210 file = tmp;
211 tmp.delete();
212 message.setDeleted(true);
213 }
214 message.setTransferable(null);
215 mXmppConnectionService.updateMessage(message);
216 mHttpConnectionManager.finishConnection(this);
217 final boolean notifyAfterScan = notify;
218 mXmppConnectionService.getFileBackend().updateMediaScanner(file, () -> {
219 if (notifyAfterScan) {
220 mXmppConnectionService.getNotificationService().push(message);
221 }
222 });
223 }
224
225 private void decryptIfNeeded() throws IOException {
226 if (file.getKey() != null && file.getIv() != null) {
227 decryptFile();
228 }
229 }
230
231 private void changeStatus(int status) {
232 this.mStatus = status;
233 mHttpConnectionManager.updateConversationUi(true);
234 }
235
236 private void showToastForException(final Exception e) {
237 final Call call = mostRecentCall;
238 final boolean cancelled = call != null && call.isCanceled();
239 if (e == null || cancelled) {
240 return;
241 }
242 if (e instanceof java.net.UnknownHostException) {
243 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_server_not_found);
244 } else if (e instanceof java.net.ConnectException) {
245 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_could_not_connect);
246 } else if (e instanceof FileWriterException) {
247 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_could_not_write_file);
248 } else if (e instanceof InvalidFileException) {
249 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_invalid_file);
250 } else {
251 mXmppConnectionService.showErrorToastInUi(R.string.download_failed_file_not_found);
252 }
253 }
254
255 private void updateProgress(long i) {
256 this.mProgress = (int) i;
257 mHttpConnectionManager.updateConversationUi(false);
258 }
259
260 @Override
261 public int getStatus() {
262 return this.mStatus;
263 }
264
265 @Override
266 public Long getFileSize() {
267 if (this.file != null) {
268 return this.file.getExpectedSize();
269 } else {
270 return null;
271 }
272 }
273
274 @Override
275 public int getProgress() {
276 return this.mProgress;
277 }
278
279 public Message getMessage() {
280 return message;
281 }
282
283 private class FileSizeChecker implements Runnable {
284
285 private final boolean interactive;
286
287 FileSizeChecker(boolean interactive) {
288 this.interactive = interactive;
289 }
290
291
292 @Override
293 public void run() {
294 check();
295 }
296
297 private void retrieveFailed(@Nullable final Exception e) {
298 changeStatus(STATUS_OFFER_CHECK_FILESIZE);
299 if (interactive) {
300 showToastForException(e);
301 } else {
302 HttpDownloadConnection.this.acceptedAutomatically = false;
303 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
304 }
305 cancel();
306 }
307
308 private void check() {
309 long size;
310 try {
311 size = retrieveFileSize();
312 } catch (final Exception e) {
313 Log.d(Config.LOGTAG, "io exception in http file size checker: " + e.getMessage());
314 retrieveFailed(e);
315 return;
316 }
317 final Message.FileParams fileParams = message.getFileParams();
318 FileBackend.updateFileParams(message, fileParams.url, size);
319 mXmppConnectionService.databaseBackend.updateMessage(message, true);
320 file.setExpectedSize(size);
321 message.resetFileParams();
322 if (mHttpConnectionManager.hasStoragePermission()
323 && size <= mHttpConnectionManager.getAutoAcceptFileSize()
324 && mXmppConnectionService.isDataSaverDisabled()) {
325 HttpDownloadConnection.this.acceptedAutomatically = true;
326 download(interactive);
327 } else {
328 changeStatus(STATUS_OFFER);
329 HttpDownloadConnection.this.acceptedAutomatically = false;
330 if (cb == null) {
331 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
332 } else {
333 cb.accept(null);
334 }
335 }
336 }
337
338 private long retrieveFileSize() throws IOException {
339 Log.d(Config.LOGTAG, "retrieve file size. interactive:" + interactive);
340 changeStatus(STATUS_CHECKING);
341 final OkHttpClient client = mHttpConnectionManager.buildHttpClient(
342 mUrl,
343 message.getConversation().getAccount(),
344 interactive
345 );
346 final Request request = new Request.Builder()
347 .url(URL.stripFragment(mUrl))
348 .addHeader("Accept-Encoding", "identity")
349 .head()
350 .build();
351 mostRecentCall = client.newCall(request);
352 try {
353 final Response response = mostRecentCall.execute();
354 throwOnInvalidCode(response);
355 final String contentLength = response.header("Content-Length");
356 final String contentType = response.header("Content-Type");
357 final AbstractConnectionManager.Extension extension = AbstractConnectionManager.Extension.of(mUrl.encodedPath());
358 if (Strings.isNullOrEmpty(extension.getExtension()) && contentType != null) {
359 final String fileExtension = MimeUtils.guessExtensionFromMimeType(contentType);
360 if (fileExtension != null) {
361 mXmppConnectionService.getFileBackend().setupRelativeFilePath(message, String.format("%s.%s", message.getUuid(), fileExtension), contentType);
362 Log.d(Config.LOGTAG, "rewriting name after not finding extension in url but in content type");
363 setupFile();
364 }
365 }
366 if (Strings.isNullOrEmpty(contentLength)) {
367 throw new IOException("no content-length found in HEAD response");
368 }
369 final long size = Long.parseLong(contentLength, 10);
370 if (size < 0) {
371 throw new IOException("Server reported negative file size");
372 }
373 return size;
374 } catch (final IOException e) {
375 Log.d(Config.LOGTAG, "io exception during HEAD " + e.getMessage());
376 throw e;
377 } catch (final NumberFormatException e) {
378 throw new IOException(e);
379 }
380 }
381
382 }
383
384 private class FileDownloader implements Runnable {
385
386 private final boolean interactive;
387
388 public FileDownloader(boolean interactive) {
389 this.interactive = interactive;
390 }
391
392 @Override
393 public void run() {
394 try {
395 changeStatus(STATUS_DOWNLOADING);
396 download();
397 decryptIfNeeded();
398 finish();
399 updateImageBounds();
400 if (cb != null) cb.accept(file);
401 } catch (final SSLHandshakeException e) {
402 changeStatus(STATUS_OFFER);
403 } catch (final Exception e) {
404 Log.d(Config.LOGTAG, message.getConversation().getAccount().getJid().asBareJid() + ": unable to download file", e);
405 if (interactive) {
406 showToastForException(e);
407 } else {
408 HttpDownloadConnection.this.acceptedAutomatically = false;
409 HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
410 }
411 cancel();
412 }
413 }
414
415 private void download() throws Exception {
416 final OkHttpClient client = mHttpConnectionManager.buildHttpClient(
417 mUrl,
418 message.getConversation().getAccount(),
419 interactive
420 );
421
422 final Request.Builder requestBuilder = new Request.Builder().url(URL.stripFragment(mUrl));
423
424 final long expected = file.getExpectedSize();
425 final boolean tryResume = file.exists() && file.getSize() > 0 && file.getSize() < expected;
426 final long resumeSize;
427 if (tryResume) {
428 resumeSize = file.getSize();
429 Log.d(Config.LOGTAG, "http download trying resume after " + resumeSize + " of " + expected);
430 requestBuilder.addHeader("Range", String.format(Locale.ENGLISH, "bytes=%d-", resumeSize));
431 } else {
432 resumeSize = 0;
433 }
434 final Request request = requestBuilder.build();
435 mostRecentCall = client.newCall(request);
436 final Response response = mostRecentCall.execute();
437 throwOnInvalidCode(response);
438 final String contentRange = response.header("Content-Range");
439 final boolean serverResumed = tryResume && contentRange != null && contentRange.startsWith("bytes " + resumeSize + "-");
440 final InputStream inputStream = response.body().byteStream();
441 final OutputStream outputStream;
442 long transmitted = 0;
443 if (tryResume && serverResumed) {
444 Log.d(Config.LOGTAG, "server resumed");
445 transmitted = file.getSize();
446 updateProgress(Math.round(((double) transmitted / expected) * 100));
447 outputStream = AbstractConnectionManager.createOutputStream(file, true, false);
448 } else {
449 final String contentLength = response.header("Content-Length");
450 final long size = Strings.isNullOrEmpty(contentLength) ? 0 : Longs.tryParse(contentLength);
451 if (expected != size) {
452 Log.d(Config.LOGTAG, "content-length reported on GET (" + size + ") did not match Content-Length reported on HEAD (" + expected + ")");
453 }
454 file.getParentFile().mkdirs();
455 Log.d(Config.LOGTAG,"creating file: "+file.getAbsolutePath());
456 if (!file.exists() && !file.createNewFile()) {
457 throw new FileWriterException(file);
458 }
459 outputStream = AbstractConnectionManager.createOutputStream(file, false, false);
460 }
461 int count;
462 final byte[] buffer = new byte[4096];
463 while ((count = inputStream.read(buffer)) != -1) {
464 transmitted += count;
465 try {
466 outputStream.write(buffer, 0, count);
467 } catch (final IOException e) {
468 throw new FileWriterException(file);
469 }
470 if (transmitted > expected) {
471 throw new InvalidFileException(String.format("File exceeds expected size of %d", expected));
472 }
473 updateProgress(Math.round(((double) transmitted / expected) * 100));
474 }
475 outputStream.flush();
476 }
477
478 private void updateImageBounds() {
479 final boolean privateMessage = message.isPrivateMessage();
480 message.setType(privateMessage ? Message.TYPE_PRIVATE_FILE : Message.TYPE_FILE);
481 final String url;
482 final String ref = mUrl.fragment();
483 if (ref != null && AesGcmURL.IV_KEY.matcher(ref).matches()) {
484 url = AesGcmURL.toAesGcmUrl(mUrl);
485 } else {
486 url = mUrl.toString();
487 }
488 mXmppConnectionService.getFileBackend().updateFileParams(message, url);
489 mXmppConnectionService.updateMessage(message);
490 }
491
492 }
493
494 private static void throwOnInvalidCode(final Response response) throws IOException {
495 final int code = response.code();
496 if (code < 200 || code >= 300) {
497 throw new IOException(String.format(Locale.ENGLISH, "HTTP Status code was %d", code));
498 }
499 }
500
501 private static class InvalidFileException extends IOException {
502
503 private InvalidFileException(final String message) {
504 super(message);
505 }
506
507 }
508}