Added initial dropbox tests - get folder contents and download file

core/src/com/unciv/ui/worldscreen/optionstable/DropBox.kt

@@ -0,0 +1,70 @@
+package com.unciv.ui.worldscreen.optionstable
+
+import com.unciv.logic.GameSaver
+import java.io.BufferedReader
+import java.io.DataOutputStream
+import java.io.InputStreamReader
+import java.net.HttpURLConnection
+import java.net.URL
+import java.nio.charset.StandardCharsets
+
+class DropBox(){
+
+    /**
+     * @param dropboxApiArg If true, then the data will be sent via a Dropbox-Api-Arg header and not via the post body
+     */
+    fun dropboxApi(url:String, data:String="",dropboxApiArg:Boolean=false):String{
+
+        with(URL(url).openConnection() as HttpURLConnection) {
+            requestMethod = "POST"  // optional default is GET
+
+            setRequestProperty("Authorization","Bearer LTdBbopPUQ0AAAAAAAACxh4_Qd1eVMM7IBK3ULV3BgxzWZDMfhmgFbuUNF_rXQWb")
+            if(!dropboxApiArg) setRequestProperty("Content-Type","application/json")
+            setRequestProperty("Dropbox-API-Arg", data)
+            doOutput = true
+
+            try {
+                if(!dropboxApiArg) {
+                    val postData: ByteArray = data.toByteArray(StandardCharsets.UTF_8)
+                    val outputStream = DataOutputStream(outputStream)
+                    outputStream.write(postData)
+                    outputStream.flush()
+                }
+
+                val reader = BufferedReader(InputStreamReader(inputStream))
+                val output = reader.readText()
+
+
+                println("\nSent 'GET' request to URL : $url; Response Code : $responseCode")
+                println(output)
+                return output
+            }
+            catch (ex:Exception){
+                println(ex.message)
+                return "Error!"
+            }
+        }
+    }
+
+    fun getFolderList(folder:String):FolderList{
+        val response = dropboxApi("https://api.dropboxapi.com/2/files/list_folder",
+                "{\"path\":\"$folder\"}")
+        return GameSaver().json().fromJson(FolderList::class.java,response)
+    }
+
+    fun getFileInfo(fileName:String):String{
+        val response = dropboxApi("https://content.dropboxapi.com/2/files/download",
+                "{\"path\":\"$fileName\"}",true)
+        return response
+    }
+
+    class FolderList{
+        var entries = ArrayList<FolderListEntry>()
+    }
+
+    class FolderListEntry{
+        var name=""
+        var path_display=""
+    }
+
+}

core/src/com/unciv/ui/worldscreen/optionstable/WorldScreenOptionsTable.kt

@@ -96,6 +96,15 @@ class WorldScreenOptionsTable(screen:WorldScreen) : PopupTable(screen){
         scrollPane.setScrollingDisabled(true,false)
         add(scrollPane).maxHeight(screen.stage.height*0.6f).row()
 
+/*
+        addButton("Dropbox Testing"){
+//            val folderList = DropBox().getFolderList("/Maps")
+//            for(folder in folderList.entries)
+//                print(folder.name)
+            DropBox().getFileInfo("/Maps/China starts on tundra")
+        }
+        */
+
         addButton("Close"){ remove() }
 
         pack() // Needed to show the background.
@@ -251,4 +260,5 @@ class WorldScreenOptionsTable(screen:WorldScreen) : PopupTable(screen){
         }
         super.draw(batch, parentAlpha)
     }
-}
+}
+