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Google App Engine and Java SDK GetTemporaryLink Error

I use Dropbox to save my application's user uploaded files. The upload part is running well. But When I try to get temporary link to my user's (not Dropbox user) files. I can't get the temporary link, the App is running at Google App Engine. Anyone can give a hint what should I do to avoid the error?

Thanks.

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Comments

Sanchez

Hi @iwansyahp, and welcome to our community!

Are you developing or using your own application? Are you using our API in any way?

I’m not familiar with Google App Engine, but if your query involves our API, then perhaps we can move your question into our API support section here.

Let me know.

Cheers!

Greg-DB

[Cross-linking for reference: https://github.com/dropbox/dropbox-sdk-java/issues/180 ]

It looks like you also posted this on GitHub. I answered there, but feel free to follow up in whichever location is more convenient for you.

iwansyahp

I use Dropbox to save my application data, PDFs and ZIPs. To download my application data in Dropbox I use Temporary Link. The problem is I couldn't get the temporary link after >10 API request.

Greg-DB

What error are you getting specifically? Please share the full output.

iwansyahp

I couldn't get the error message, but based my condition checker code, It is look like output of the client.files().getTemporaryLink is "" (empty string) or null.

BTW, I use Java for my App and Dropbox-core-sdk (Java version)

Greg-DB

I'm afraid I don't follow. The method would either return a result or raise an exception. Please double check the actual result.

Also, can you share the relevant code and steps to reproduce the issue?

iwansyahp

This is my actual code.

public String unduhBerkas(String path)
           throws GetTemporaryLinkErrorException, DbxException{

       DbxRequestConfig config = DbxRequestConfig.newBuilder("My_App/1.0")
                 .withHttpRequestor(new GoogleAppEngineRequestor())
                 .withAutoRetryEnabled(100) // maksimal cobalagi jika gagal membuat request
                 .build();

       DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);

GetTemporaryLinkResult temporaryLink = client.files().getTemporaryLink(path);
this.link = temporaryLink.getLink();

           if (this.link.equals("")){
               Date date = new Date();
               // ambil 4 jam dari sekarang
               Date timeLinkExpiresAt = addMinutesToDate(240, date);
               SharedLinkSettings sharedLinkSettings = SharedLinkSettings.newBuilder()
                       .withExpires(timeLinkExpiresAt)
                       .build();
               SharedLinkMetadata sharedLink = client.sharing().createSharedLinkWithSettings(path, sharedLinkSettings);
               this.link = sharedLink.getUrl();
               // ganti ujung URL dari dl=0 menjadi dl=1 agar bisa didownload
               if (this.link.endsWith("0")){
                   this.link = this.link.substring(0, this.link.length()-1) + "1";
               }
           }

       return link;
   }

Greg-DB

I don't see any obvious issues with that. Can you add some logging or connect a debugger to check the actual return value from getTemporaryLink, or any raised exception?

iwansyahp

This is the response I got, Another problem I found is response of API is inconsistent for same files (folders), Sometime I got 200, and sometimes 409 HTTPS Status Codes.

This is the screenshot of request timeline.

Dropbox API Error Logging

Greg-DB

The 200 or 409 are just some possible status codes, and only indicate success/failure at a high level. The response body would contain more specific success or error information, but your screenshot doesn't include it unfortunately.

The SDK reads the response body and converts it to the native return type or exception, respectively, though. For example, if there is nothing found at the specific path, the response would be a 409 with some JSON indicating the issue in the response body, converted into a native exception by the SDK.

Please check what output or exception you're getting from the method. For instance, here's an example of handling a few different exceptions. The getTemporaryLink method throws GetTemporaryLinkErrorException.

iwansyahp

That is the response (body) and Catched exception I got when accessing the file through the SDK. I have checked filename reference value in my application database are right and same. Even when I try accessing and opening file through Dropbox.com (manually) are okay, but my app still can't get the temporarylink.

chirstius

Does this app have full Dropbox access, or is it within an App Folder?

It's possible the path you are providing in code is invalid. For example, if you're app is hosted in an app folder, it will show up as:

/Apps/App Name

When viewing it via the web or desktop UI. However, within the application, and for all calls to the API, the /Apps/App Name folder is actually the root "/" folder.

A common error is to provide the "full" path to a file when calling against an app folder-based application:

client.files().getTemporaryLink("/Apps/App Name/Folder/file.name");

rather than just providing the path information from the application root folder:

client.files().getTemporaryLink("/Folder/file.name");

You posted a code sample showing the method, and it takes a 'path' argument. Can you verify if your application is App Folder-based, and if so, verify that the path information being passed in is correct?

Thanks!

-Chuck