checks if secret from qr code is valid

- secret size must be greater than 32 chars
  an only contain letters and '-'
- context check in camera fragment now fixed

app/src/main/java/com/maenle/bump/ui/CameraFragment.kt

@@ -49,6 +49,8 @@ class CameraFragment: Fragment() {
     private var _binding: FragmentCameraBinding? = null
     private val binding get() = _binding!!
 
+    private var secretScanned = false
+
     private val screenAspectRatio: Int
     get() {
         val activity = requireActivity()
@@ -179,15 +181,26 @@ class CameraFragment: Fragment() {
         val inputImage =
             InputImage.fromMediaImage(imageProxy.image!!, imageProxy.imageInfo.rotationDegrees)
 
+        var blockingScanned = false
+
         barcodeScanner.process(inputImage)
             .addOnSuccessListener { barcodes ->
-                barcodes.forEach {
-                    Log.d(TAG, it.rawValue!!)
-                    val bump = BumpProcessor.getInstance(requireContext())
-                   bump.addSecret(requireContext(), it.rawValue!!)
-                    findNavController().navigateUp()
-
+                if(blockingScanned) {
+                    return@addOnSuccessListener
                 }
+                blockingScanned = true
+                barcodes.forEach { barcode ->
+                    if(!secretScanned) {
+                        context?.let {
+                            val bump = BumpProcessor.getInstance(it)
+                            if (bump.addSecret(requireContext(), barcode.rawValue!!)) {
+                                secretScanned = true
+                                findNavController().navigateUp()
+                            }
+                        }
+                    }
+                }
+                blockingScanned = false
             }
             .addOnFailureListener {
                 Log.e(TAG, it.message ?: it.toString())

app/src/main/java/com/maenle/bump/util/BumpProcessor.kt

@@ -13,14 +13,11 @@ import java.io.File
 class BumpProcessor constructor(context: Context) {
 
     private var rest: RestSingleton = RestSingleton.getInstance(context)
-    private var secret: String? = null
     private lateinit var log: JSONArray
-    private var messenger: MessageProcessor? = null
+
 
     init {
-        secret = getSecret(context)
         log = getLog(context)
-        messenger = secret?.let { MessageProcessor(it) }
     }
 
     companion object {
@@ -50,13 +47,6 @@ class BumpProcessor constructor(context: Context) {
         }
     }
 
-    fun hasSecret(): Boolean {
-        secret?.let {
-            return true
-        }
-        return false
-    }
-
     private fun getSecret(context: Context):String? {
         val local = LocalData(context)
         return local.code
@@ -76,7 +66,10 @@ class BumpProcessor constructor(context: Context) {
     }
 
     private fun updateFromServer(context: Context) {
-        messenger?.let {rest.list(it.sender) {list -> updateLog(context, list)}}
+        LocalData(context).code?.let {
+            val messenger = MessageProcessor(it)
+            rest.list(messenger.sender) { list -> updateLog(context, list) }
+        }
     }
 
     private fun addToLog(context: Context, line: JSONObject) {
@@ -84,12 +77,21 @@ class BumpProcessor constructor(context: Context) {
         logFile.appendText(line.toString())
     }
 
-    fun addSecret(context: Context, newCode: String) {
+    fun addSecret(context: Context, newCode: String): Boolean {
+        return if(!checkCodeValidity(newCode)) {
+            false
+        } else {
             val local = LocalData(context)
             local.code = newCode
-        secret = getSecret(context)
 
-        setFirebaseToken()
+            setFirebaseToken(context)
+            true
+        }
+    }
+
+    private fun checkCodeValidity(newCode: String): Boolean {
+        val validChars = newCode.filter{ it in 'A'..'Z' || it in 'a'..'z' || it == '-'}.length
+        return newCode.length == validChars && newCode.length >= 32
     }
 
     private fun getLog(context: Context): JSONArray {
@@ -104,11 +106,11 @@ class BumpProcessor constructor(context: Context) {
         return log
     }
 
-    private fun setFirebaseToken() {
+    private fun setFirebaseToken(context: Context) {
         val tokenTask = FirebaseMessaging.getInstance().token
-        tokenTask.addOnSuccessListener {  token -> (
-                messenger?.let { rest.firebase(it.sender, token) {result -> Log.d("result", result.toString())}})
-        }
+        val secret = LocalData(context).code
+        val messenger = secret?.let { MessageProcessor(it) }
+        tokenTask.addOnSuccessListener {  token -> ( messenger?.sender?.let { rest.firebase(it, token) { result -> Log.d("result", result.toString())} } ) }
     }
 
 }