Add initial implementation of Gopenpgp-backed PGP (#1441)

1 files changed, 177 insertions, 0 deletions

diff --git a/app/src/main/java/dev/msfjarvis/aps/ui/crypto/GopenpgpDecryptActivity.kt b/app/src/main/java/dev/msfjarvis/aps/ui/crypto/GopenpgpDecryptActivity.kt
new file mode 100644
index 00000000..b2e710f8
--- /dev/null
+++ b/app/src/main/java/dev/msfjarvis/aps/ui/crypto/GopenpgpDecryptActivity.kt
@@ -0,0 +1,177 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.ui.crypto
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import androidx.lifecycle.lifecycleScope
+import dagger.hilt.android.AndroidEntryPoint
+import dev.msfjarvis.aps.R
+import dev.msfjarvis.aps.data.passfile.PasswordEntry
+import dev.msfjarvis.aps.data.password.FieldItem
+import dev.msfjarvis.aps.databinding.DecryptLayoutBinding
+import dev.msfjarvis.aps.injection.crypto.CryptoSet
+import dev.msfjarvis.aps.injection.password.PasswordEntryFactory
+import dev.msfjarvis.aps.ui.adapters.FieldItemAdapter
+import dev.msfjarvis.aps.util.extensions.unsafeLazy
+import dev.msfjarvis.aps.util.extensions.viewBinding
+import java.io.File
+import javax.inject.Inject
+import kotlin.time.Duration
+import kotlin.time.ExperimentalTime
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+@AndroidEntryPoint
+class GopenpgpDecryptActivity : BasePgpActivity() {
+
+  private val binding by viewBinding(DecryptLayoutBinding::inflate)
+  @Inject lateinit var passwordEntryFactory: PasswordEntryFactory
+  @Inject lateinit var cryptos: CryptoSet
+  private val relativeParentPath by unsafeLazy { getParentPath(fullPath, repoPath) }
+
+  private var passwordEntry: PasswordEntry? = null
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    title = name
+    with(binding) {
+      setContentView(root)
+      passwordCategory.text = relativeParentPath
+      passwordFile.text = name
+      passwordFile.setOnLongClickListener {
+        copyTextToClipboard(name)
+        true
+      }
+    }
+    decrypt()
+  }
+
+  override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+    menuInflater.inflate(R.menu.pgp_handler, menu)
+    passwordEntry?.let { entry ->
+      if (menu != null) {
+        menu.findItem(R.id.edit_password).isVisible = true
+        if (!entry.password.isNullOrBlank()) {
+          menu.findItem(R.id.share_password_as_plaintext).isVisible = true
+          menu.findItem(R.id.copy_password).isVisible = true
+        }
+      }
+    }
+    return true
+  }
+
+  override fun onOptionsItemSelected(item: MenuItem): Boolean {
+    when (item.itemId) {
+      android.R.id.home -> onBackPressed()
+      R.id.edit_password -> editPassword()
+      R.id.share_password_as_plaintext -> shareAsPlaintext()
+      R.id.copy_password -> copyPasswordToClipboard(passwordEntry?.password)
+      else -> return super.onOptionsItemSelected(item)
+    }
+    return true
+  }
+
+  /**
+   * Automatically finishes the activity 60 seconds after decryption succeeded to prevent
+   * information leaks from stale activities.
+   */
+  @OptIn(ExperimentalTime::class)
+  private fun startAutoDismissTimer() {
+    lifecycleScope.launch {
+      delay(Duration.seconds(60))
+      finish()
+    }
+  }
+
+  /**
+   * Edit the current password and hide all the fields populated by encrypted data so that when the
+   * result triggers they can be repopulated with new data.
+   */
+  private fun editPassword() {
+    val intent = Intent(this, PasswordCreationActivity::class.java)
+    intent.putExtra("FILE_PATH", relativeParentPath)
+    intent.putExtra("REPO_PATH", repoPath)
+    intent.putExtra(PasswordCreationActivity.EXTRA_FILE_NAME, name)
+    intent.putExtra(PasswordCreationActivity.EXTRA_PASSWORD, passwordEntry?.password)
+    intent.putExtra(PasswordCreationActivity.EXTRA_EXTRA_CONTENT, passwordEntry?.extraContentString)
+    intent.putExtra(PasswordCreationActivity.EXTRA_EDITING, true)
+    startActivity(intent)
+    finish()
+  }
+
+  private fun shareAsPlaintext() {
+    val sendIntent =
+      Intent().apply {
+        action = Intent.ACTION_SEND
+        putExtra(Intent.EXTRA_TEXT, passwordEntry?.password)
+        type = "text/plain"
+      }
+    // Always show a picker to give the user a chance to cancel
+    startActivity(
+      Intent.createChooser(sendIntent, resources.getText(R.string.send_plaintext_password_to))
+    )
+  }
+
+  private fun decrypt() {
+    lifecycleScope.launch {
+      // TODO(msfjarvis): native methods are fallible, add error handling once out of testing
+      val message = withContext(Dispatchers.IO) { File(fullPath).readBytes() }
+      val result =
+        withContext(Dispatchers.IO) {
+          val crypto = cryptos.first { it.canHandle(fullPath) }
+          crypto.decrypt(
+            PRIV_KEY,
+            PASS.toByteArray(charset = Charsets.UTF_8),
+            message,
+          )
+        }
+      startAutoDismissTimer()
+
+      val entry = passwordEntryFactory.create(lifecycleScope, result)
+      passwordEntry = entry
+      invalidateOptionsMenu()
+
+      val items = arrayListOf<FieldItem>()
+      val adapter = FieldItemAdapter(emptyList(), true) { text -> copyTextToClipboard(text) }
+      if (!entry.password.isNullOrBlank()) {
+        items.add(FieldItem.createPasswordField(entry.password!!))
+      }
+
+      if (entry.hasTotp()) {
+        lifecycleScope.launch {
+          items.add(FieldItem.createOtpField(entry.totp.value))
+          entry.totp.collect { code ->
+            withContext(Dispatchers.Main) { adapter.updateOTPCode(code) }
+          }
+        }
+      }
+
+      if (!entry.username.isNullOrBlank()) {
+        items.add(FieldItem.createUsernameField(entry.username!!))
+      }
+
+      entry.extraContent.forEach { (key, value) ->
+        items.add(FieldItem(key, value, FieldItem.ActionType.COPY))
+      }
+
+      binding.recyclerView.adapter = adapter
+      adapter.updateItems(items)
+    }
+  }
+
+  companion object {
+    // TODO(msfjarvis): source these from storage and user input
+    const val PRIV_KEY = ""
+    const val PASS = ""
+  }
+}