Integrate PGPainless backend into the UI properly (#1647)

1 files changed, 58 insertions, 0 deletions

diff --git a/app/src/main/java/dev/msfjarvis/aps/data/crypto/CryptoRepository.kt b/app/src/main/java/dev/msfjarvis/aps/data/crypto/CryptoRepository.kt
new file mode 100644
index 00000000..b0cde380
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/data/crypto/CryptoRepository.kt
@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.data.crypto
+
+import com.github.michaelbull.result.runCatching
+import com.github.michaelbull.result.unwrap
+import dev.msfjarvis.aps.crypto.PGPKeyManager
+import dev.msfjarvis.aps.crypto.PGPainlessCryptoHandler
+import dev.msfjarvis.aps.util.extensions.isOk
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import javax.inject.Inject
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+class CryptoRepository
+@Inject
+constructor(
+  private val pgpKeyManager: PGPKeyManager,
+  private val pgpCryptoHandler: PGPainlessCryptoHandler,
+) {
+
+  suspend fun decrypt(
+    password: String,
+    message: ByteArrayInputStream,
+    out: ByteArrayOutputStream,
+  ) {
+    withContext(Dispatchers.IO) { decryptPgp(password, message, out) }
+  }
+
+  suspend fun encrypt(content: ByteArrayInputStream, out: ByteArrayOutputStream) {
+    withContext(Dispatchers.IO) { encryptPgp(content, out) }
+  }
+
+  private suspend fun decryptPgp(
+    password: String,
+    message: ByteArrayInputStream,
+    out: ByteArrayOutputStream,
+  ) {
+    val keys = pgpKeyManager.getAllKeys().unwrap()
+    // Iterates through the keys until the first successful decryption, then returns.
+    keys.first { key ->
+      runCatching { pgpCryptoHandler.decrypt(key, password, message, out) }.isOk()
+    }
+  }
+
+  private suspend fun encryptPgp(content: ByteArrayInputStream, out: ByteArrayOutputStream) {
+    val keys = pgpKeyManager.getAllKeys().unwrap()
+    pgpCryptoHandler.encrypt(
+      keys,
+      content,
+      out,
+    )
+  }
+}