Initial biometric authentication support (#541)

* [WIP] Initial biometric authentication support

* Redirect decryption app shortcut to go through LaunchActivity

* UserPreference: Clear existing shortcuts when toggling password auth

Clears out any auth-bypassed entries that exist

* Fix hilarious copypasta derp

Signed-off-by: Harsh Shandilya <msfjarvis@gmail.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/app/src/main/java/com/zeapo/pwdstore/LaunchActivity.kt b/app/src/main/java/com/zeapo/pwdstore/LaunchActivity.kt
new file mode 100644
index 00000000..8f607ee0
--- /dev/null
+++ b/app/src/main/java/com/zeapo/pwdstore/LaunchActivity.kt
@@ -0,0 +1,49 @@
+package com.zeapo.pwdstore
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.preference.PreferenceManager
+import com.zeapo.pwdstore.crypto.PgpActivity
+import com.zeapo.pwdstore.utils.auth.AuthenticationResult
+import com.zeapo.pwdstore.utils.auth.Authenticator
+
+class LaunchActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val prefs = PreferenceManager.getDefaultSharedPreferences(this)
+        if (prefs.getBoolean("biometric_auth", false)) {
+            Authenticator(this) {
+                when (it) {
+                    is AuthenticationResult.Success -> {
+                        startTargetActivity()
+                    }
+                    is AuthenticationResult.UnrecoverableError -> {
+                        finish()
+                    }
+                    else -> {
+                    }
+                }
+            }.authenticate()
+        } else {
+            startTargetActivity()
+        }
+    }
+
+    private fun startTargetActivity() {
+        if (intent?.getStringExtra("OPERATION") == "DECRYPT") {
+            val decryptIntent = Intent(this, PgpActivity::class.java)
+            decryptIntent.putExtra("NAME", intent.getStringExtra("NAME"))
+            decryptIntent.putExtra("FILE_PATH", intent.getStringExtra("FILE_PATH"))
+            decryptIntent.putExtra("REPO_PATH", intent.getStringExtra("REPO_PATH"))
+            decryptIntent.putExtra("LAST_CHANGED_TIMESTAMP", intent.getLongExtra("LAST_CHANGED_TIMESTAMP", 0L))
+            decryptIntent.putExtra("OPERATION", "DECRYPT")
+            startActivity(decryptIntent)
+        }else {
+            startActivity(Intent(this, PasswordStore::class.java))
+        }
+        overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)
+        finish()
+    }
+}