Added permission request event

app/src/main/java/com/topjohnwu/magisk/model/permissions/PermissionRequestBuilder.kt

@@ -0,0 +1,40 @@
+package com.topjohnwu.magisk.model.permissions
+
+typealias SimpleCallback = () -> Unit
+typealias PermissionRationaleCallback = (List<String>) -> Unit
+
+class PermissionRequestBuilder {
+
+    private var onSuccessCallback: SimpleCallback = {}
+    private var onFailureCallback: SimpleCallback = {}
+    private var onShowRationaleCallback: PermissionRationaleCallback = {}
+
+    fun onSuccess(callback: SimpleCallback) {
+        onSuccessCallback = callback
+    }
+
+    fun onFailure(callback: SimpleCallback) {
+        onFailureCallback = callback
+    }
+
+    fun onShowRationale(callback: PermissionRationaleCallback) {
+        onShowRationaleCallback = callback
+    }
+
+    fun build(): PermissionRequest {
+        return PermissionRequest(onSuccessCallback, onFailureCallback, onShowRationaleCallback)
+    }
+
+}
+
+class PermissionRequest(
+    private val onSuccessCallback: SimpleCallback,
+    private val onFailureCallback: SimpleCallback,
+    private val onShowRationaleCallback: PermissionRationaleCallback
+) {
+
+    fun onSuccess() = onSuccessCallback()
+    fun onFailure() = onFailureCallback()
+    fun onShowRationale(permissions: List<String>) = onShowRationaleCallback(permissions)
+
+}