WIP: before pull

android/app/src/main/java/com/whoscall/ContactModule.kt

+package com.whoscall
+
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReactContextBaseJavaModule
+import com.facebook.react.bridge.ReactMethod
+import com.facebook.react.bridge.Promise
+import org.json.JSONArray
+
+class ContactModule(reactContext: ReactApplicationContext) :
+    ReactContextBaseJavaModule(reactContext) {
+
+    override fun getName(): String = "ContactModule"
+
+    @ReactMethod
+    fun getDisplayName(contactsJson: String, incomingNumber: String, promise: Promise) {
+        try {
+            val arr = JSONArray(contactsJson)
+            val normIncoming = normalize(incomingNumber)
+            for (i in 0 until arr.length()) {
+                val obj = arr.getJSONObject(i)
+                val number = normalize(obj.getString("number"))
+                val name = obj.getString("name")
+                if (normIncoming == number) {
+                    promise.resolve(name)
+                    return
+                }
+            }
+            promise.resolve(null)
+        } catch (e: Exception) {
+            promise.reject("ERR", e)
+        }
+    }
+
+    private fun normalize(n: String): String {
+        return n.replace(Regex("[^+0-9]"), "")
+    }
+}