Make AutofillService mock implementation (#711)

mobile-app/android/app/src/main/java/net/aliasvault/app/AutofillService.kt

@@ -1,28 +1,228 @@
+/**
+ * AliasVault Autofill Service Implementation
+ *
+ * This service implements the Android Autofill framework to provide AliasVault credentials
+ * to forms. It identifies username and password fields in apps and websites,
+ * then offers stored credentials from AliasVault.
+ *
+ * IMPORTANT IMPLEMENTATION NOTES:
+ * 1. Since autofill services don't have direct access to activities, we need a way to
+ *    authenticate the user. The current implementation:
+ *     - Shows a Toast indicating authentication is needed
+ *     - In a real implementation, would launch an activity for authentication
+ *
+ * 2. To complete this implementation, you need to:
+ *     - Register this service in AndroidManifest.xml with proper metadata
+ *     - Add a way to communicate between the launched activity and this service
+ *     - Implement credential storage/retrieval with proper authentication
+ *
+ * 3. For full production implementation, consider:
+ *     - Adding a specific autofill activity for authentication
+ *     - Implementing dataset presentation customization
+ *     - Adding support for save functionality
+ *     - Implementing field detection heuristics for apps without autofill hints
+ */
 package net.aliasvault.app
+import android.app.assist.AssistStructure
+import android.content.Intent
 import android.os.Build
 import android.os.CancellationSignal
 import android.service.autofill.AutofillService
 import android.service.autofill.FillCallback
+import android.service.autofill.FillContext
 import android.service.autofill.FillRequest
+import android.service.autofill.FillResponse
 import android.service.autofill.SaveCallback
 import android.service.autofill.SaveRequest
+import android.util.Log
+import android.view.View
+import android.view.autofill.AutofillId
+import android.view.autofill.AutofillValue
+import android.widget.RemoteViews
+import android.widget.Toast
 import androidx.annotation.RequiresApi
+import androidx.fragment.app.FragmentActivity
+import net.aliasvault.app.credentialmanager.Credential
+import net.aliasvault.app.credentialmanager.SharedCredentialStore
+import org.json.JSONArray
+import android.service.autofill.Dataset
 
-@RequiresApi(Build.VERSION_CODES.O)
 class AutofillService : AutofillService() {
+    private val TAG = "AliasVaultAutofill"
+
     override fun onFillRequest(
         request: FillRequest,
         cancellationSignal: CancellationSignal,
         callback: FillCallback
     ) {
-        // 1. Parse the structure of the form
-        // 2. Check for autofillable fields
-        // 3. Create Dataset with credentials
-        // 4. Call callback.onSuccess()
+        Log.d(TAG, "onFillRequest called")
+
+        // Check if request was cancelled
+        if (cancellationSignal.isCanceled) {
+            return
+        }
+
+        // Get the autofill contexts for this request
+        val contexts = request.fillContexts
+        val context = contexts.last()
+        val structure = context.structure
+
+        // Find any autofillable fields in the form
+        val fieldFinder = FieldFinder()
+        parseStructure(structure, fieldFinder)
+
+        // If no fields were found, return an empty response
+        if (fieldFinder.autofillableFields.isEmpty()) {
+            Log.d(TAG, "No autofillable fields found")
+            callback.onSuccess(null)
+            return
+        }
+
+        // Since we're in a Service, we don't have direct access to a FragmentActivity
+        // Option 1: Launch an activity to authenticate and then fill
+        launchActivityForAutofill(fieldFinder, callback)
+
+        // Option 2: For immediate filling without authentication (simplified for demo purposes)
+        // createMockAutofillResponse(fieldFinder, callback)
     }
 
     override fun onSaveRequest(request: SaveRequest, callback: SaveCallback) {
-        // Optionally handle saving credentials
+        // In a full implementation, you would:
+        // 1. Extract the username/password from the SaveRequest
+        // 2. Launch an activity to let the user confirm saving
+        // 3. Save the credential using the SharedCredentialStore
+
+        // For now, just acknowledge the request
         callback.onSuccess()
     }
+
+    private fun launchActivityForAutofill(fieldFinder: FieldFinder, callback: FillCallback) {
+        // In a real implementation, you would launch an activity to handle authentication
+        // For now, we'll just show a toast message and return null
+        Toast.makeText(applicationContext, "Authentication required for autofill", Toast.LENGTH_SHORT).show()
+
+        // For this example, we'll use mock response to demonstrate functionality
+        createMockAutofillResponse(fieldFinder, callback)
+
+        // Example of how you might start the activity (commented out)
+        /*
+        val intent = Intent(this, MainActivity::class.java).apply {
+            putExtra("AUTOFILL_REQUEST", true)
+            // Add other data as needed
+            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        }
+        startActivity(intent)
+        */
+    }
+
+    // This method demonstrates what the response would look like if we had credentials
+    private fun createMockAutofillResponse(fieldFinder: FieldFinder, callback: FillCallback) {
+        // Create a mock credential for demonstration
+        val credential = Credential("demo@example.com", "password123", "Example Service")
+
+        // Build a response with the credential
+        val responseBuilder = FillResponse.Builder()
+
+        // Create a dataset with the credential
+        val presentation = RemoteViews(packageName, android.R.layout.simple_list_item_1)
+        presentation.setTextViewText(android.R.id.text1, "AliasVault: ${credential.service}")
+
+        val dataSetBuilder = Dataset.Builder(presentation)
+
+        // Add autofill values for all fields - fill everything with either username or password
+        // depending on if the field appears to be a password field
+        for (field in fieldFinder.autofillableFields) {
+            val isPassword = field.second
+            val value = if (isPassword) credential.password else credential.username
+            dataSetBuilder.setValue(field.first, AutofillValue.forText(value))
+        }
+
+        responseBuilder.addDataset(dataSetBuilder.build())
+        callback.onSuccess(responseBuilder.build())
+    }
+
+    private fun parseStructure(structure: AssistStructure, fieldFinder: FieldFinder) {
+        val nodeCount = structure.windowNodeCount
+        for (i in 0 until nodeCount) {
+            val windowNode = structure.getWindowNodeAt(i)
+            val rootNode = windowNode.rootViewNode
+            parseNode(rootNode, fieldFinder)
+        }
+    }
+
+    private fun parseNode(node: AssistStructure.ViewNode, fieldFinder: FieldFinder) {
+        val viewId = node.autofillId
+
+        // Consider any editable field as an autofillable field
+        if (viewId != null && isEditableField(node)) {
+            // Check if it's likely a password field
+            val isPasswordField = isLikelyPasswordField(node)
+            fieldFinder.autofillableFields.add(Pair(viewId, isPasswordField))
+            Log.d(TAG, "Found autofillable field: $viewId, isPassword: $isPasswordField")
+        }
+
+        // Recursively parse child nodes
+        val childCount = node.childCount
+        for (i in 0 until childCount) {
+            parseNode(node.getChildAt(i), fieldFinder)
+        }
+    }
+
+    private fun isEditableField(node: AssistStructure.ViewNode): Boolean {
+        // Check if the node is editable in any way
+        return node.inputType > 0 ||
+               node.className?.contains("EditText") == true ||
+               node.className?.contains("Input") == true ||
+               node.htmlInfo?.tag?.equals("input", ignoreCase = true) == true
+    }
+
+    private fun isLikelyPasswordField(node: AssistStructure.ViewNode): Boolean {
+        // Try to determine if this is a password field
+        val hints = node.autofillHints
+        if (hints != null) {
+            for (hint in hints) {
+                if (hint == View.AUTOFILL_HINT_PASSWORD || hint.contains("password", ignoreCase = true)) {
+                    return true
+                }
+            }
+        }
+
+        // Check by input type
+        if ((node.inputType and android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD) != 0 ||
+            (node.inputType and android.text.InputType.TYPE_TEXT_VARIATION_WEB_PASSWORD) != 0) {
+            return true
+        }
+
+        // Check by ID or text
+        val idEntry = node.idEntry
+        if (idEntry != null && idEntry.contains("pass", ignoreCase = true)) {
+            return true
+        }
+
+        // Check by HTML attributes
+        val htmlInfo = node.htmlInfo
+        if (htmlInfo != null) {
+            val attributes = htmlInfo.attributes
+            if (attributes != null) {
+                for (i in 0 until attributes.size) {
+                    val name = attributes.get(i)?.first
+                    val value = attributes.get(i)?.second
+                    if (name == "type" && value == "password") {
+                        return true
+                    }
+                }
+            }
+        }
+
+        return false
+    }
+
+    private class FieldFinder {
+        // Store pairs of (AutofillId, isPasswordField)
+        val autofillableFields = mutableListOf<Pair<AutofillId, Boolean>>()
+    }
+
+    companion object {
+        private const val TAG = "AliasVaultAutofill"
+    }
 }