refactor: android key checks

Author: ian-wd

android/src/main/java/com/sourcetoad/idscanreactnative/IdscanSdkModule.kt

@@ -120,17 +120,20 @@ class IdscanSdkModule(reactContext: ReactApplicationContext) :
   fun scan(type: String?, apiKeys: ReadableMap, callback: Callback) {
     Log.d(NAME, "React Native IDScanner starting")
 
-    if ((apiKeys.isNull(KEY_MRZ_KEY) && apiKeys.isNull(KEY_PDF_KEY)) || apiKeys.isNull(KEY_PARSER_KEY)) {
+    val hasMRZKey = apiKeys.hasKey(KEY_MRZ_KEY) && !apiKeys.isNull(KEY_MRZ_KEY)
+    val hasPDFKey = apiKeys.hasKey(KEY_PDF_KEY) && !apiKeys.isNull(KEY_PDF_KEY)
+    val hasParserKey = apiKeys.hasKey(KEY_PARSER_KEY) && !apiKeys.isNull(KEY_PARSER_KEY)
+
+    if ((!hasMRZKey && !hasPDFKey) || !hasParserKey) {
       val scanResult = Arguments.createMap()
       scanResult.putString("success", "false")
-
       callback.invoke("Must provide activation keys for IDScan.net's Camera Scanner and ID Parser SDKs")
       return
     }
 
     scannerType = type
-    scannerMRZKey = apiKeys.getString(KEY_MRZ_KEY)
-    scannerPDFKey = apiKeys.getString(KEY_PDF_KEY)
+    scannerMRZKey = if (hasMRZKey) apiKeys.getString(KEY_MRZ_KEY) else ""
+    scannerPDFKey = if (hasPDFKey) apiKeys.getString(KEY_PDF_KEY) else ""
     parserKey = apiKeys.getString(KEY_PARSER_KEY)
 
     this.callback = callback