Wire in fallback key selection flow (#958)

Co-authored-by: Fabian Henneke <fabian@henneke.me>
(cherry picked from commit 084b833fa49a583433284f0173cb7342152b263b)

5 files changed, 242 insertions, 135 deletions

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 2fc14f3b..dae4466b 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -81,6 +81,11 @@
             android:parentActivityName=".PasswordStore"
             android:windowSoftInputMode="adjustResize" />
 
+        <activity
+            android:name=".crypto.GetKeyIdsActivity"
+            android:parentActivityName=".PasswordStore"
+            android:theme="@style/NoBackgroundTheme" />
+
         <service
             android:name=".autofill.AutofillService"
             android:enabled="@bool/enable_accessibility_autofill"
diff --git a/app/src/main/java/com/zeapo/pwdstore/crypto/GetKeyIdsActivity.kt b/app/src/main/java/com/zeapo/pwdstore/crypto/GetKeyIdsActivity.kt
new file mode 100644
index 00000000..12bc6536
--- /dev/null
+++ b/app/src/main/java/com/zeapo/pwdstore/crypto/GetKeyIdsActivity.kt
@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package com.zeapo.pwdstore.crypto
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.activity.result.IntentSenderRequest
+import androidx.activity.result.contract.ActivityResultContracts.StartIntentSenderForResult
+import androidx.lifecycle.lifecycleScope
+import com.github.ajalt.timberkt.e
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import me.msfjarvis.openpgpktx.util.OpenPgpApi
+import me.msfjarvis.openpgpktx.util.OpenPgpUtils
+import org.openintents.openpgp.IOpenPgpService2
+
+class GetKeyIdsActivity : BasePgpActivity() {
+
+    private val userInteractionRequiredResult = registerForActivityResult(StartIntentSenderForResult()) { result ->
+        if (result.data == null || result.resultCode == RESULT_CANCELED) {
+            setResult(RESULT_CANCELED, result.data)
+            finish()
+            return@registerForActivityResult
+        }
+        getKeyIds(result.data!!)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        bindToOpenKeychain(this)
+    }
+
+    override fun onBound(service: IOpenPgpService2) {
+        super.onBound(service)
+        getKeyIds()
+    }
+
+    override fun onError(e: Exception) {
+        e(e)
+    }
+
+    /**
+     * Get the Key ids from OpenKeychain
+     */
+    private fun getKeyIds(data: Intent = Intent()) {
+        data.action = OpenPgpApi.ACTION_GET_KEY_IDS
+        lifecycleScope.launch(Dispatchers.IO) {
+            api?.executeApiAsync(data, null, null) { result ->
+                when (result?.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+                    OpenPgpApi.RESULT_CODE_SUCCESS -> {
+                        try {
+                            val ids = result.getLongArrayExtra(OpenPgpApi.RESULT_KEY_IDS)?.map {
+                                OpenPgpUtils.convertKeyIdToHex(it)
+                            } ?: emptyList()
+                            val keyResult = Intent().putExtra(OpenPgpApi.EXTRA_KEY_IDS, ids.toTypedArray())
+                            setResult(RESULT_OK, keyResult)
+                            finish()
+                        } catch (e: Exception) {
+                            e(e)
+                        }
+                    }
+                    OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED -> {
+                        val sender = getUserInteractionRequestIntent(result)
+                        userInteractionRequiredResult.launch(IntentSenderRequest.Builder(sender).build())
+                    }
+                    OpenPgpApi.RESULT_CODE_ERROR -> handleError(result)
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/zeapo/pwdstore/crypto/PasswordCreationActivity.kt b/app/src/main/java/com/zeapo/pwdstore/crypto/PasswordCreationActivity.kt
index 851dbaa1..3c1757f1 100644
--- a/app/src/main/java/com/zeapo/pwdstore/crypto/PasswordCreationActivity.kt
+++ b/app/src/main/java/com/zeapo/pwdstore/crypto/PasswordCreationActivity.kt
@@ -250,7 +250,7 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
     }
 
     @OptIn(ExperimentalUnsignedTypes::class)
-    private fun parseGpgIdentifier(identifier: String) : GpgIdentifier? {
+    private fun parseGpgIdentifier(identifier: String): GpgIdentifier? {
         // Match long key IDs:
         // FF22334455667788 or 0xFF22334455667788
         val maybeLongKeyId = identifier.removePrefix("0x").takeIf {
@@ -279,166 +279,196 @@ class PasswordCreationActivity : BasePgpActivity(), OpenPgpServiceConnection.OnB
     /**
      * Encrypts the password and the extra content
      */
-    private fun encrypt(receivedIntent: Intent? = null) = with(binding) {
-        val editName = filename.text.toString().trim()
-        val editPass = password.text.toString()
-        val editExtra = extraContent.text.toString()
-
-        if (editName.isEmpty()) {
-            snackbar(message = resources.getString(R.string.file_toast_text))
-            return@with
-        } else if (editName.contains('/')) {
-            snackbar(message = resources.getString(R.string.invalid_filename_text))
-            return@with
-        }
+    private fun encrypt(receivedIntent: Intent? = null) {
+        with(binding) {
+            val editName = filename.text.toString().trim()
+            val editPass = password.text.toString()
+            val editExtra = extraContent.text.toString()
 
-        if (editPass.isEmpty() && editExtra.isEmpty()) {
-            snackbar(message = resources.getString(R.string.empty_toast_text))
-            return@with
-        }
+            if (editName.isEmpty()) {
+                snackbar(message = resources.getString(R.string.file_toast_text))
+                return@with
+            } else if (editName.contains('/')) {
+                snackbar(message = resources.getString(R.string.invalid_filename_text))
+                return@with
+            }
 
-        if (copy) {
-            copyPasswordToClipboard(editPass)
-        }
+            if (editPass.isEmpty() && editExtra.isEmpty()) {
+                snackbar(message = resources.getString(R.string.empty_toast_text))
+                return@with
+            }
+
+            if (copy) {
+                copyPasswordToClipboard(editPass)
+            }
 
-        val data = receivedIntent ?: Intent()
-        data.action = OpenPgpApi.ACTION_ENCRYPT
+            val data = receivedIntent ?: Intent()
+            data.action = OpenPgpApi.ACTION_ENCRYPT
 
-        // pass enters the key ID into `.gpg-id`.
-        val repoRoot = PasswordRepository.getRepositoryDirectory(applicationContext)
-        val gpgIdentifierFile = File(repoRoot, directory.text.toString()).findTillRoot(".gpg-id", repoRoot)
-        if (gpgIdentifierFile == null) {
-            snackbar(message = resources.getString(R.string.failed_to_find_key_id))
-            return@with
-        }
-        val gpgIdentifierFileContent = gpgIdentifierFile.useLines { it.firstOrNull() } ?: ""
-        when (val identifier = parseGpgIdentifier(gpgIdentifierFileContent)) {
-            is GpgIdentifier.KeyId -> data.putExtra(OpenPgpApi.EXTRA_KEY_IDS, arrayOf(identifier.id).toLongArray())
-            is GpgIdentifier.UserId -> data.putExtra(OpenPgpApi.EXTRA_USER_IDS, arrayOf(identifier.email))
-            null -> {
-                snackbar(message = resources.getString(R.string.invalid_gpg_id))
+            // pass enters the key ID into `.gpg-id`.
+            val repoRoot = PasswordRepository.getRepositoryDirectory(applicationContext)
+            val gpgIdentifierFile = File(repoRoot, directory.text.toString()).findTillRoot(".gpg-id", repoRoot)
+            if (gpgIdentifierFile == null) {
+                snackbar(message = resources.getString(R.string.failed_to_find_key_id))
                 return@with
             }
-        }
-        data.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true)
-
-        val content = "$editPass\n$editExtra"
-        val inputStream = ByteArrayInputStream(content.toByteArray())
-        val outputStream = ByteArrayOutputStream()
-
-        val path = when {
-            // If we allowed the user to edit the relative path, we have to consider it here instead
-            // of fullPath.
-            directoryInputLayout.isEnabled -> {
-                val editRelativePath = directory.text.toString().trim()
-                if (editRelativePath.isEmpty()) {
-                    snackbar(message = resources.getString(R.string.path_toast_text))
-                    return
-                }
-                val passwordDirectory = File("$repoPath/${editRelativePath.trim('/')}")
-                if (!passwordDirectory.exists() && !passwordDirectory.mkdir()) {
-                    snackbar(message = "Failed to create directory ${editRelativePath.trim('/')}")
-                    return
+            val gpgIdentifiers = gpgIdentifierFile.readLines()
+                .filter { it.isNotBlank() }
+                .map { line ->
+                    parseGpgIdentifier(line) ?: run {
+                        snackbar(message = resources.getString(R.string.invalid_gpg_id))
+                        return@with
+                    }
                 }
-
-                "${passwordDirectory.path}/$editName.gpg"
+            if (gpgIdentifiers.isEmpty()) {
+                registerForActivityResult(StartActivityForResult()) { result ->
+                    if (result.resultCode == RESULT_OK) {
+                        result.data?.getStringArrayExtra(OpenPgpApi.EXTRA_KEY_IDS)?.let { keyIds ->
+                            gpgIdentifierFile.writeText(keyIds.joinToString("\n"))
+                            val repo = PasswordRepository.getRepository(null)
+                            if (repo != null) {
+                                commitChange(
+                                    getString(
+                                        R.string.git_commit_gpg_id,
+                                        getLongName(gpgIdentifierFile.parentFile!!.absolutePath, repoPath, gpgIdentifierFile.name)
+                                    )
+                                )
+                            }
+                            encrypt(data)
+                        }
+                    }
+                }.launch(Intent(this@PasswordCreationActivity, GetKeyIdsActivity::class.java))
+                return@with
+            }
+            val keyIds = gpgIdentifiers.filterIsInstance<GpgIdentifier.KeyId>().map { it.id }.toLongArray()
+            if (keyIds.isNotEmpty()) {
+                data.putExtra(OpenPgpApi.EXTRA_KEY_IDS, keyIds)
+            }
+            val userIds = gpgIdentifiers.filterIsInstance<GpgIdentifier.UserId>().map { it.email }.toTypedArray()
+            if (userIds.isNotEmpty()) {
+                data.putExtra(OpenPgpApi.EXTRA_USER_IDS, userIds)
             }
-            else -> "$fullPath/$editName.gpg"
-        }
 
-        lifecycleScope.launch(Dispatchers.IO) {
-            api?.executeApiAsync(data, inputStream, outputStream) { result ->
-                when (result?.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
-                    OpenPgpApi.RESULT_CODE_SUCCESS -> {
-                        try {
-                            val file = File(path)
-                            // If we're not editing, this file should not already exist!
-                            if (!editing && file.exists()) {
-                                snackbar(message = getString(R.string.password_creation_duplicate_error))
-                                return@executeApiAsync
-                            }
+            data.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true)
 
-                            if (!isInsideRepository(file)) {
-                                snackbar(message = getString(R.string.message_error_destination_outside_repo))
-                                return@executeApiAsync
-                            }
+            val content = "$editPass\n$editExtra"
+            val inputStream = ByteArrayInputStream(content.toByteArray())
+            val outputStream = ByteArrayOutputStream()
 
+            val path = when {
+                // If we allowed the user to edit the relative path, we have to consider it here instead
+                // of fullPath.
+                directoryInputLayout.isEnabled -> {
+                    val editRelativePath = directory.text.toString().trim()
+                    if (editRelativePath.isEmpty()) {
+                        snackbar(message = resources.getString(R.string.path_toast_text))
+                        return
+                    }
+                    val passwordDirectory = File("$repoPath/${editRelativePath.trim('/')}")
+                    if (!passwordDirectory.exists() && !passwordDirectory.mkdir()) {
+                        snackbar(message = "Failed to create directory ${editRelativePath.trim('/')}")
+                        return
+                    }
+
+                    "${passwordDirectory.path}/$editName.gpg"
+                }
+                else -> "$fullPath/$editName.gpg"
+            }
+
+            lifecycleScope.launch(Dispatchers.IO) {
+                api?.executeApiAsync(data, inputStream, outputStream) { result ->
+                    when (result?.getIntExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_ERROR)) {
+                        OpenPgpApi.RESULT_CODE_SUCCESS -> {
                             try {
-                                file.outputStream().use {
-                                    it.write(outputStream.toByteArray())
+                                val file = File(path)
+                                // If we're not editing, this file should not already exist!
+                                if (!editing && file.exists()) {
+                                    snackbar(message = getString(R.string.password_creation_duplicate_error))
+                                    return@executeApiAsync
                                 }
-                            } catch (e: IOException) {
-                                e(e) { "Failed to write password file" }
-                                setResult(RESULT_CANCELED)
-                                MaterialAlertDialogBuilder(this@PasswordCreationActivity)
-                                    .setTitle(getString(R.string.password_creation_file_fail_title))
-                                    .setMessage(getString(R.string.password_creation_file_write_fail_message))
-                                    .setCancelable(false)
-                                    .setPositiveButton(android.R.string.ok) { _, _ ->
-                                        finish()
-                                    }
-                                    .show()
-                                return@executeApiAsync
-                            }
 
-                            val returnIntent = Intent()
-                            returnIntent.putExtra(RETURN_EXTRA_CREATED_FILE, path)
-                            returnIntent.putExtra(RETURN_EXTRA_NAME, editName)
-                            returnIntent.putExtra(RETURN_EXTRA_LONG_NAME, getLongName(fullPath, repoPath, editName))
-
-                            if (shouldGeneratePassword) {
-                                val directoryStructure =
-                                    AutofillPreferences.directoryStructure(applicationContext)
-                                val entry = PasswordEntry(content)
-                                returnIntent.putExtra(RETURN_EXTRA_PASSWORD, entry.password)
-                                val username = PasswordEntry(content).username
-                                    ?: directoryStructure.getUsernameFor(file)
-                                returnIntent.putExtra(RETURN_EXTRA_USERNAME, username)
-                            }
-
-                            val repo = PasswordRepository.getRepository(null)
-                            if (repo != null) {
-                                val status = Git(repo).status().call()
-                                if (status.modified.isNotEmpty()) {
-                                    commitChange(
-                                        getString(
-                                            R.string.git_commit_edit_text,
-                                            getLongName(fullPath, repoPath, editName)
-                                        )
-                                    )
+                                if (!isInsideRepository(file)) {
+                                    snackbar(message = getString(R.string.message_error_destination_outside_repo))
+                                    return@executeApiAsync
                                 }
-                            }
 
-                            if (directoryInputLayout.isVisible && directoryInputLayout.isEnabled && oldFileName != null) {
-                                val oldFile = File("$repoPath/${oldCategory?.trim('/')}/$oldFileName.gpg")
-                                if (oldFile.path != file.path && !oldFile.delete()) {
+                                try {
+                                    file.outputStream().use {
+                                        it.write(outputStream.toByteArray())
+                                    }
+                                } catch (e: IOException) {
+                                    e(e) { "Failed to write password file" }
                                     setResult(RESULT_CANCELED)
                                     MaterialAlertDialogBuilder(this@PasswordCreationActivity)
-                                        .setTitle(R.string.password_creation_file_fail_title)
-                                        .setMessage(getString(R.string.password_creation_file_delete_fail_message, oldFileName))
+                                        .setTitle(getString(R.string.password_creation_file_fail_title))
+                                        .setMessage(getString(R.string.password_creation_file_write_fail_message))
                                         .setCancelable(false)
                                         .setPositiveButton(android.R.string.ok) { _, _ ->
                                             finish()
                                         }
                                         .show()
+                                    return@executeApiAsync
+                                }
+
+                                val returnIntent = Intent()
+                                returnIntent.putExtra(RETURN_EXTRA_CREATED_FILE, path)
+                                returnIntent.putExtra(RETURN_EXTRA_NAME, editName)
+                                returnIntent.putExtra(RETURN_EXTRA_LONG_NAME, getLongName(fullPath, repoPath, editName))
+
+                                if (shouldGeneratePassword) {
+                                    val directoryStructure =
+                                        AutofillPreferences.directoryStructure(applicationContext)
+                                    val entry = PasswordEntry(content)
+                                    returnIntent.putExtra(RETURN_EXTRA_PASSWORD, entry.password)
+                                    val username = PasswordEntry(content).username
+                                        ?: directoryStructure.getUsernameFor(file)
+                                    returnIntent.putExtra(RETURN_EXTRA_USERNAME, username)
+                                }
+
+                                val repo = PasswordRepository.getRepository(null)
+                                if (repo != null) {
+                                    val status = Git(repo).status().call()
+                                    if (status.modified.isNotEmpty()) {
+                                        commitChange(
+                                            getString(
+                                                R.string.git_commit_edit_text,
+                                                getLongName(fullPath, repoPath, editName)
+                                            )
+                                        )
+                                    }
+                                }
+
+                                if (directoryInputLayout.isVisible && directoryInputLayout.isEnabled && oldFileName != null) {
+                                    val oldFile = File("$repoPath/${oldCategory?.trim('/')}/$oldFileName.gpg")
+                                    if (oldFile.path != file.path && !oldFile.delete()) {
+                                        setResult(RESULT_CANCELED)
+                                        MaterialAlertDialogBuilder(this@PasswordCreationActivity)
+                                            .setTitle(R.string.password_creation_file_fail_title)
+                                            .setMessage(getString(R.string.password_creation_file_delete_fail_message, oldFileName))
+                                            .setCancelable(false)
+                                            .setPositiveButton(android.R.string.ok) { _, _ ->
+                                                finish()
+                                            }
+                                            .show()
+                                    } else {
+                                        setResult(RESULT_OK, returnIntent)
+                                        finish()
+                                    }
                                 } else {
                                     setResult(RESULT_OK, returnIntent)
                                     finish()
                                 }
-                            } else {
-                                setResult(RESULT_OK, returnIntent)
-                                finish()
-                            }
 
-                        } catch (e: Exception) {
-                            e(e) { "An Exception occurred" }
+                            } catch (e: Exception) {
+                                e(e) { "An Exception occurred" }
+                            }
                         }
+                        OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED -> {
+                            val sender = getUserInteractionRequestIntent(result)
+                            userInteractionRequiredResult.launch(IntentSenderRequest.Builder(sender).build())
+                        }
+                        OpenPgpApi.RESULT_CODE_ERROR -> handleError(result)
                     }
-                    OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED -> {
-                        val sender = getUserInteractionRequestIntent(result)
-                        userInteractionRequiredResult.launch(IntentSenderRequest.Builder(sender).build())
-                    }
-                    OpenPgpApi.RESULT_CODE_ERROR -> handleError(result)
                 }
             }
         }
diff --git a/app/src/main/java/com/zeapo/pwdstore/utils/PreferenceKeys.kt b/app/src/main/java/com/zeapo/pwdstore/utils/PreferenceKeys.kt
index 3235c7fc..9eb549da 100644
--- a/app/src/main/java/com/zeapo/pwdstore/utils/PreferenceKeys.kt
+++ b/app/src/main/java/com/zeapo/pwdstore/utils/PreferenceKeys.kt
@@ -37,9 +37,6 @@ object PreferenceKeys {
     const val GIT_SERVER_INFO = "git_server_info"
     const val HTTPS_PASSWORD = "https_password"
     const val LENGTH = "length"
-    const val OPENPGP_KEY_IDS_SET = "openpgp_key_ids_set"
-    const val OPENPGP_KEY_ID_PREF = "openpgp_key_id_pref"
-    const val OPENPGP_PROVIDER_LIST = "openpgp_provider_list"
     const val OREO_AUTOFILL_CUSTOM_PUBLIC_SUFFIXES = "oreo_autofill_custom_public_suffixes"
     const val OREO_AUTOFILL_DEFAULT_USERNAME = "oreo_autofill_default_username"
     const val OREO_AUTOFILL_DIRECTORY_STRUCTURE = "oreo_autofill_directory_structure"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 489b0726..a59d5965 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -45,6 +45,7 @@
     <string name="git_commit_remove_text">Remove %1$s from store.</string>
     <string name="git_commit_move_text">Rename %1$s to %2$s.</string>
     <string name="git_commit_move_multiple_text">Move multiple passwords to %1$s.</string>
+    <string name="git_commit_gpg_id">Initialize GPG IDs in %1$s.</string>
 
     <!-- PGPHandler -->
     <string name="clipboard_password_toast_text">Password copied to clipboard, you have %d seconds to paste it somewhere.</string>
@@ -366,7 +367,7 @@
     <string name="otp_import_failure">Failed to import TOTP configuration</string>
     <string name="exporting_passwords">Exporting passwords…</string>
     <string name="failed_to_find_key_id">Failed to locate .gpg-id, is your store set up correctly?</string>
-    <string name="invalid_gpg_id">Found .gpg-id, but it did not contain a key ID, fingerprint or user ID</string>
+    <string name="invalid_gpg_id">Found .gpg-id, but it contains an invalid key ID, fingerprint or user ID</string>
     <string name="invalid_filename_text">File name must not contain \'/\', set directory above</string>
     <string name="directory_hint">Directory</string>
 </resources>