Add JSONRequestBody helper

Signed-off-by: ZetaTom <[email protected]>

Author: ZetaTom

library/src/main/java/com/nextcloud/common/JSONRequestBody.kt

@@ -0,0 +1,31 @@
+package com.nextcloud.common
+
+import com.google.gson.Gson
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
+
+class JSONRequestBody() {
+    private val content = mutableMapOf<String, String>()
+
+    constructor(key: String, value: String) : this() {
+        put(key, value)
+    }
+
+    fun put(key: String, value: String) {
+        content[key] = value
+    }
+
+    fun get(): RequestBody {
+        val json = Gson().toJson(content)
+        return json.toRequestBody(JSON_MEDIATYPE)
+    }
+
+    override fun toString(): String {
+        return content.toString()
+    }
+
+    companion object {
+        private val JSON_MEDIATYPE = "application/json; charset=utf-8".toMediaType()
+    }
+}