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