Upload/download small files from internet in game?

Question

I need the player to be able to upload and download small files to and from their application's persistent data path. Here is the code I have right now:

     IEnumerator UploadFileData()
     {
         string s_playerID = PlayFabManager.loggedInPlayfabId;
         string s_levelID = PlayFabManager.levelID;
 
         using (var uwr = new UnityWebRequest("https://example.com/", UnityWebRequest.kHttpVerbPUT))
         {
             string path = Path.Combine(Application.persistentDataPath, $"{s_playerID}{s_levelID}.replay");
             uwr.uploadHandler = new UploadHandlerFile(path);
             yield return uwr.SendWebRequest();
             if (uwr.result != UnityWebRequest.Result.Success)
                 Debug.LogError(uwr.error);
             else
             {
                 Debug.Log("File successfully uploaded.");
             }
         }
     }
 
     IEnumerator DownloadFile()
     {
         string l_playerID = PlayFabManager.load_PlayfabId;
         string l_levelID = PlayFabManager.load_levelID;
 
         var uwr = new UnityWebRequest("https://example.com/", UnityWebRequest.kHttpVerbGET);
         string path = Path.Combine(Application.persistentDataPath, $"{l_playerID}{l_levelID}.replay");
         uwr.downloadHandler = new DownloadHandlerFile(path);
         yield return uwr.SendWebRequest();
         if (uwr.result != UnityWebRequest.Result.Success)
             Debug.LogError(uwr.error);
         else
             Debug.Log("File successfully downloaded and saved to " + path);
     }

The code needs to ID which player made the file and what level the file was made on, if you were curious what the "s_playerID" stuff is. I understand I need to replace the "https://example.com/" with a URL to send and receive the data, but I don't know of a file hosting service to use and how to get the proper URL from it. It would be nice if I could just do it with dropbox or google drive, but I hear its not that simple. Are there any free file hosting services that would fit my needs here? Since the files are so small, I can make do with pretty tight storage limits. Any suggestions are super appreciated!

Answer 1

Most ISP does not support PUT, but you can do it with POST and the web database. Here is a full example, but it's cut from a bigger project so some variables aren't there, but you should get the idea. It also sends and stores all data as base64. You will need knowledge to make the webserver php-files.

 //probably unity is escaping the & and other chars so $_POST in php
 //contained only one big element with everything
 // luckily we can build our own raw sender:
 UnityWebRequest CreateUnityWebRequest(string url, string param)
 {
     UnityWebRequest requestU = new UnityWebRequest(url, UnityWebRequest.kHttpVerbPOST);
     byte[] bytes = System.Text.Encoding.UTF8.GetBytes(param);
     UploadHandlerRaw uH = new UploadHandlerRaw(bytes);
     //uH.contentType = "application/json"; //this is ignored?
     requestU.uploadHandler = uH;
     requestU.SetRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     DownloadHandler dH = new DownloadHandlerBuffer();
     requestU.downloadHandler = dH;
     return requestU;
 }

 public IEnumerator SendHiscore(string szLevel, int iScoreMs, Replay oReplay)
 {
     bIsDone = false;
     byte[] bytes = oReplay.SaveToMem();
     string base64 = System.Convert.ToBase64String(bytes);

     string url = WEB_HOST + "/achievements_post.php";
     string data= "LEVEL="+ szLevel + "&NAME="+ UnityWebRequest.EscapeURL(GameManager.szUser) + "&USERID="+ UnityWebRequest.EscapeURL(GameManager.szUserID) + "&SCORE="+ iScoreMs + "&REPLAY="+ base64;

     www = CreateUnityWebRequest(url, data); //UnityWebRequest.Post(url, data); <- didn't work
     yield return www.SendWebRequest();

     if (www.isNetworkError || www.isHttpError)
     {
         Debug.Log(www.error);
     }
     else
     {
     }
     bIsDone = true;
 }

 public IEnumerator GetReplay(string szLevel, string szId, Replay oResult)
 {
     bIsDone = false;

     string url = WEB_HOST + "/hiscore_getreplay2.php?Level=" + szLevel + "&UserId=" + UnityWebRequest.EscapeURL(szId);
     www = UnityWebRequest.Get(url);
     yield return www.SendWebRequest();

     if (www.isNetworkError || www.isHttpError)
     {
         Debug.Log(www.error);
     }
     else
     {
         //retrieve results as text and convert it to binary
         byte[] bytes = System.Convert.FromBase64String(www.downloadHandler.text);

         oResult.LoadFromMem(bytes);
     }
     bIsDone = true;
 }

If you host your game (open source) on SourceForge they provide a web + database.

Upload/download small files from internet in game?

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