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Encrypted files: store decrypted file in a dedicated folder

This commit is contained in:
Benoit Marty 2020-12-08 18:35:17 +01:00
parent 237cb63fc2
commit 62791e4b36
2 changed files with 51 additions and 21 deletions
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7
matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/file/FileService.kt
View File

@ -60,10 +60,15 @@ interface FileService {
fun fileState(mxcUrl: String, mimeType: String?): FileState
/**
* Clears all the files downloaded by the service
* Clears all the files downloaded by the service, including decrypted files
*/
fun clearCache()
/**
* Clears all the decrypted files by the service
*/
fun clearDecryptedCache()
/**
* Get size of cached files
*/

65
matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/DefaultFileService.kt
View File

@ -63,7 +63,15 @@ internal class DefaultFileService @Inject constructor(
private fun String.safeFileName() = URLEncoder.encode(this, Charsets.US_ASCII.displayName())
private val downloadFolder = File(sessionCacheDirectory, "MF")
// Folder to store downloaded file (not decrypted)
private val legacyFolder = File(sessionCacheDirectory, "MF")
private val downloadFolder = File(sessionCacheDirectory, "F")
private val decryptedFolder = File(downloadFolder, "D")
init {
// Clear the legacy downloaded files
legacyFolder.deleteRecursively()
}
/**
* Retain ongoing downloads to avoid re-downloading and already downloading file
@ -103,8 +111,8 @@ internal class DefaultFileService @Inject constructor(
return taskExecutor.executorScope.launch(coroutineDispatchers.main) {
withContext(coroutineDispatchers.io) {
Try {
if (!downloadFolder.exists()) {
downloadFolder.mkdirs()
if (!decryptedFolder.exists()) {
decryptedFolder.mkdirs()
}
// ensure we use unique file name by using URL (mapped to suitable file name)
// Also we need to add extension for the FileProvider, if not it lot's of app that it's
@ -134,29 +142,42 @@ internal class DefaultFileService @Inject constructor(
Timber.v("Response size ${response.body?.contentLength()} - Stream available: ${!source.exhausted()}")
if (elementToDecrypt != null) {
Timber.v("## FileService: decrypt file")
val decryptSuccess = destFile.outputStream().buffered().use {
MXEncryptedAttachments.decryptAttachment(
source.inputStream(),
elementToDecrypt,
it
)
}
response.close()
if (!decryptSuccess) {
return@flatMap Try.Failure(IllegalStateException("Decryption error"))
}
} else {
writeToFile(source.inputStream(), destFile)
response.close()
}
// Write the file to cache (encrypted version if the file is encrypted)
writeToFile(source.inputStream(), destFile)
response.close()
} else {
Timber.v("## FileService: cache hit for $url")
}
Try.just(destFile)
}
}.flatMap { downloadedFile ->
// Decrypt if necessary
if (elementToDecrypt != null) {
val decryptedFile = File(decryptedFolder, fileForUrl(unwrappedUrl, mimeType))
if (!decryptedFile.exists()) {
Timber.v("## FileService: decrypt file")
val decryptSuccess = decryptedFile.outputStream().buffered().use { outputStream ->
downloadedFile.inputStream().use { inputStream ->
MXEncryptedAttachments.decryptAttachment(
inputStream,
elementToDecrypt,
outputStream
)
}
}
if (!decryptSuccess) {
return@flatMap Try.Failure(IllegalStateException("Decryption error"))
}
} else {
Timber.v("## FileService: cache hit for decrypted file")
}
Try.just(decryptedFile)
} else {
// Clear file
Try.just(downloadedFile)
}
}.fold(
{ throwable ->
callback.onFailure(throwable)
@ -240,4 +261,8 @@ internal class DefaultFileService @Inject constructor(
override fun clearCache() {
downloadFolder.deleteRecursively()
}
override fun clearDecryptedCache() {
decryptedFolder.deleteRecursively()
}
}