PUT upload file to AWS S3 presigned url Retrofit2 Android

Question

I have a pre-signed upload URL from AWS S3 to upload a video file to. Testing on Postman the video is successfully uploaded. However i get a 403 returned when implementing in retrofit. I cannot use multipart upload for this task.

service call :

@Headers("Content-Type: video/mp4")
    @PUT
    fun uploadTaskAWS(@Url awsUrl: String, @Body filePart: RequestBody): Call<ResponseBody>

upload:

            val file = File(task.file_path)
            val requestFile = RequestBody.create(MediaType.parse("video/mp4"), file)
            val response = awsTaskUploadService.uploadTaskAWS(task.upload_url, requestFile)

I have ensured the URL is correct. The content type header is added too, postman screenshot attached. Getting 403 Forbidden Error

screenshot of postman

I have found this related question however i'm still getting a 403. Upload a file to AWS S3 pre-signed URL using Retrofit2

Any suggestions?

score 5 · Accepted Answer · answered Mar 21 '19 at 14:16

5

solution was to include multipart and expect Single response not Call :

  @Multipart
    @PUT
    fun uploadAsset(
        @Header(CONTENT_TYPE) contentType: String,
        @Url uploadUrl: String,
        @Part file: MultipartBody.Part
    ): Single<ResponseBody>

where contentType is passed in

val requestFile = RequestBody.create(MediaType.parse(contentType), file)
val body = MultipartBody.Part.createFormData(mediaType, task.file_name, requestFile)
assetService.uploadAsset(contentType, task.upload_url, body)

answered Mar 21 '19 at 14:16

nt95

382
5
21

4

For others looking, I had the same problem and the suggested methods are now deprecated moreover Android now uses content providers making it tricky to access the underlying file, if interested I documented my solution [here](https://gutier.io/post/android-upload-file-to-aws-s3-bucket-with-retrofit2/) – zzantares Mar 24 '20 at 04:59
Perfect solution. Follow link which @ZzAntáres has mentioned – Lokesh Desai May 18 '20 at 09:46
Thank you @ZzAntáres. – Victor Ude May 06 '21 at 18:04
Thanks boy @ZzAntáres . you saved my day. – hassan mirza Oct 14 '21 at 14:18
Single is undefined. From where it should add – KIRAN K J Nov 22 '21 at 13:33

score 1 · Answer 2 · answered Mar 14 '19 at 12:19

1

403 error means the server knows who you are but do not have the authority to perform the desired action.

If the pre-signed URL is correctly generated, you should be able to upload without any authentication.

You can check if postman is by default adding any AWS Authentication to request

Also you need to explicitly set the protocol version while signing requests if uploading to a region that uses only version 4.

answered Mar 14 '19 at 12:19

Nikhil Sahu

2,268
2
34
46

1

What do you mean by protocol version? – charitha amarasinghe Mar 26 '21 at 01:35

PUT upload file to AWS S3 presigned url Retrofit2 Android

2 Answers2