fix: mergeJSON

Author: arm64v8a

app/src/main/java/io/nekohasekai/sagernet/fmt/ConfigBuilder.kt

@@ -440,7 +440,10 @@ fun buildConfig(
 
                     // custom JSON merge
                     if (bean.customOutboundJson.isNotBlank()) {
-                        Util.mergeJSON(bean.customOutboundJson, currentOutbound)
+                        Util.mergeJSON(
+                            bean.customOutboundJson,
+                            currentOutbound as MutableMap<String, Any?>
+                        )
                     }
                 }
 

app/src/main/java/moe/matsuri/nb4a/utils/Util.kt

@@ -113,33 +113,46 @@ object Util {
         }
     }
 
+    fun map2StringMap(m: Map<*, *>): MutableMap<String, Any?> {
+        val o = mutableMapOf<String, Any?>()
+        m.forEach {
+            if (it.key is String) {
+                o[it.key as String] = it.value as Any
+            }
+        }
+        return o
+    }
 
-    fun mergeJSON(j: String, to: MutableMap<String, Any>) {
-        if (j.isBlank()) return
-        val m = JavaUtil.gson.fromJson(j, to.javaClass)
-        m.forEach { (k, v) ->
-            if (v is Map<*, *> && to[k] is Map<*, *>) {
-                val currentMap = (to[k] as Map<*, *>).toMutableMap()
-                currentMap += v
-                to[k] = currentMap
+    fun mergeMap(dst: MutableMap<String, Any?>, src: Map<String, Any?>): MutableMap<String, Any?> {
+        src.forEach { (k, v) ->
+            if (v is Map<*, *> && dst[k] is Map<*, *>) {
+                val currentMap = (dst[k] as Map<*, *>).toMutableMap()
+                dst[k] = mergeMap(map2StringMap(currentMap), map2StringMap(v))
             } else if (v is List<*>) {
                 if (k.startsWith("+")) {  // prepend
                     val dstKey = k.removePrefix("+")
-                    var currentList = (to[dstKey] as List<*>).toMutableList()
+                    var currentList = (dst[dstKey] as List<*>).toMutableList()
                     currentList = (v + currentList).toMutableList()
-                    to[dstKey] = currentList
+                    dst[dstKey] = currentList
                 } else if (k.endsWith("+")) {  // append
                     val dstKey = k.removeSuffix("+")
-                    var currentList = (to[dstKey] as List<*>).toMutableList()
+                    var currentList = (dst[dstKey] as List<*>).toMutableList()
                     currentList = (currentList + v).toMutableList()
-                    to[dstKey] = currentList
+                    dst[dstKey] = currentList
                 } else {
-                    to[k] = v
+                    dst[k] = v
                 }
             } else {
-                to[k] = v
+                dst[k] = v
             }
         }
+        return dst
+    }
+
+    fun mergeJSON(j: String, dst: MutableMap<String, Any?>) {
+        if (j.isBlank()) return
+        val src = JavaUtil.gson.fromJson(j, dst.javaClass)
+        mergeMap(dst, src)
     }
 
     // Format Time