Image share with linkedin v2 api not posting on page feed

Question

Ok so this is my problem.. To share an image post via linkedin api, you first have to register your image file, you do that via a post request in which you send your binary file. Then you use the the image URN in the original request to submit your post. My request goes through, returns 201 code (which should be a successful request) but ends up not posting the image or the text. If i try to post only text, it works. I've tried registering my image using curl, and it posted on linkedin, so i think i'm not sending the binary file in a request properly, this is my request:

            HttpClient client = HttpClientBuilder.create().build();
            HttpPut request = new HttpPut(uploadUrl);
            request.addHeader("Content-Type", "data/binary");
            request.setHeader("X-Restli-Protocol-Version", "2.0.0");
            request.setHeader("Authorization", "Bearer " + myToken);

            File file = new File(pictureUrl);

            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            builder.addBinaryBody("upload-file", file);
            request.setEntity(builder.build());
            HttpResponse response = client.execute(request);

I get code 201 with this code, but it still doesn't post. This is the curl example of the request that they give on Share API doc.

curl -i --upload-file /Users/peter/Desktop/superneatimage.png --header "Authorization: Bearer redacted" 'https://api.linkedin.com/mediaUpload/C5522AQGTYER3k3ByHQ/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQJbrN86Zm265gAAAWemyz2pxPSgONtBiZdchrgG872QltnfYjnMdb2j3A&app=1953784&sync=0&v=beta&ut=2H-IhpbfXrRow1'

Can you tell me what is wrong with my java equivalent?

Edit: Forgot to say i even tried calling curl from java, the same code i used in the terminal, and it still didn't work..

        Process p;
        try {
            p = Runtime.getRuntime().exec("curl -i --upload-file" + " " + pictureUrl + " " + "--header \"Authorization: Bearer " + myToken + "\" '" + uploadUrl + "'");
            p.waitFor();
            BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

            String line = "";
            String outputController = "";
            while ((line = reader.readLine()) != null) {
                outputController = outputController + '\n' + line;
            }
            System.out.println("out: ");
            System.out.println(outputController);
            return true;
        } catch (IOException | InterruptedException ex) {
            return false;
        }

Output returned an empty String.

Edit2: Another funny thing, when i execute the main request, in which i send the text, and media urns that i get after submitting images, i get 201 again, like it's successful, and in the response i even get the post id. Then i try to use the another api endpoint and pull that post using the id i got from the response, and i get all the data, like the post is posted. It even says in the json that i get that lifecycle is PUBLISHED and the status of the medias is READY. Only thing that's different from the json an image post that is on linkedin is that the media object have thumbnails, and in this case they don't, it's just an empty json array.

Answer 1

I found curl to C# converter https://curl.olsh.me/ below is code snippet is generated:

    using (var httpClient = new HttpClient())
    {
        using (var request = new HttpRequestMessage(new HttpMethod("PUT"), "https://api.linkedin.com/mediaUpload/C5522AQGTYER3k3ByHQ/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQJbrN86Zm265gAAAWemyz2pxPSgONtBiZdchrgG872QltnfYjnMdb2j3A&app=1953784&sync=0&v=beta&ut=2H-IhpbfXrRow1"))
        {
            request.Headers.TryAddWithoutValidation("Authorization", "Bearer redacted"); 

            request.Content = new ByteArrayContent(File.ReadAllBytes("/test.png")); 

            var response = await httpClient.SendAsync(request);
        }
    }

Answer 2

Ok I've solved it, if anyone encounters the same problem, this is what i did wrong. In the request i added a multipart to request body, this is wrong, you just go RAW. So instead of

    File file = new File(pictureUrl);
    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
    builder.addBinaryBody("upload-file", file);
    request.setEntity(builder.build());

you just put

request.setEntity(new FileEntity(new File(pictureUrl), ContentType.create(picture.getContentType())));

and then everything goes on ok.

Answer 3

Not familiar with Java, but I had the same problem using Ruby and I fixed it by adding the MIME type of the image I was uploading as the Content-Type in the request headers. So in your specific case it would be:

request.addHeader("Content-Type", "image/png");

Also take a look at my solution using Ruby's RestClient and Minimagick: https://stackoverflow.com/a/54902863/7844946

Answer 4

I was writing with kotlin and after struggling with the same problem for a long time I managed to fix it, for those struggling with the similar problem, I'll leave my sample codes below. For the visual you need to provide a direct URI path, also pay attention to the header structure.

Here are the codes.

var file = File(ImageURI)
    val urls = URL(url)
    var connection: HttpsURLConnection = urls.openConnection() as HttpsURLConnection
    connection.setRequestProperty("Authorization","Bearer " + accesToken)
    connection.setRequestProperty("Content-Type", "image/png")
    connection.setRequestProperty("cache-control", "no-cache")
    connection.setRequestProperty("X-Restli-Protocol-Version", "2.0.0")
    connection.requestMethod = "POST"
    connection.doOutput = true
    connection.doInput = true

    var request = DataOutputStream(connection.outputStream)
    request.write(file.readBytes())
    request.flush()

    println("Response: "+connection.responseCode)