Question

我想使用REST API将媒体数据上传到S3存储桶，而不使用Amazon SDK。我在文件上传到s3存储桶时收到“403 Forbidden Access Denied Error”，请提出合适的操作。如果还需要其他任何东西我也可以分享。

String bucket = getString(R.string.s3_bucket);
            RestAdapter.Builder builder = new RestAdapter.Builder()
                .setEndpoint("http://" + bucket + ".s3.amazonaws.com")
                .setLogLevel(RestAdapter.LogLevel.FULL)
                .setClient(new OkClient(new OkHttpClient()));

            AwsS3 aws = builder.build().create(AwsS3.class);

            DateTimeFormatter fmt = DateTimeFormat.forPattern("EEE', 'dd' 'MMM' 'yyyy' 'HH:mm:ss' 'Z").withLocale(Locale.US);
            String ZONE = "GMT";
            DateTime dt = new DateTime();
            DateTime dateTime = dt.withZone(DateTimeZone.forID(ZONE)).plusHours(1);
            String formattedDate = dateTime.toString(fmt);

            try {
                Bitmap bm = BitmapFactory.decodeFile(mCurrentPhotoPath);
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
                byte[] b = baos.toByteArray();
                TypedInput body = new TypedByteArray("image/jpg", b);
                String imageName = "files_" + System.currentTimeMillis();
                String oauth = AWSOauth.getOAuthAWS(getApplicationContext(), imageName.trim());
                String host = bucket + ".s3.amazonaws.com";
                String mimeType = body.mimeType();
                long length = body.length();
                File file = new File(mCurrentPhotoPath);
                RequestBody bb = RequestBody.create(MediaType.parse("image/jpeg"), file);

                aws.upload(imageName.trim(),length,"/**",host,formattedDate,mimeType,oauth,bb,new Callback<String>(){

                    @Override
                    public void success(String s, Response response) {
                        Log.d("tag","S = " + s);
                        Log.d("tag","getHeaders = " + response.getHeaders());
                        Log.d("tag","Status = " + response.getStatus());
                    }

                    @Override
                    public void failure(RetrofitError error) {
                        Log.d("tag","error: S = " + error.getMessage());
                    }
                });
            }catch (Exception e){

            }


 @PUT("/{Key}")
void upload(@Path("Key") String Key,
                    @Header("Content-Length") long length,
                    @Header("Accept") String accept,
                    @Header("Host") String host,
                    @Header("Date") String date,
                    @Header("Content-type") String contentType,
                    @Header("Authorization") String authorization,
                    @Body RequestBody body,Callback<String> mCallback);

Answer 1

如果您的应用有关联的后端服务，您可以在Android应用中使用Amazon SDK上传到S3，如果您获得后端生成的上传的预先指定的网址，并通过API调用将其发送到应用。以下是亚马逊针对不同语言的一些文档：https://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedUrlUploadObject.html

以下是使用后端预先签名的网址的Android代码示例：

public interface AmazonService {
    @Multipart
    @POST
    Call<ResponseBody> upload(@Url String url, @PartMap Map<String,RequestBody> params, @Part MultipartBody.Part file);
}

public class AmazonS3Client {
    private static final String EMPTY_URL_TO_MAKE_RETROFIT_HAPPY = "";

    public boolean uploadMoment(Map<String, String> fields, String filePath, String s3BaseUrl) {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.NONE);
        OkHttpClient okClient = new OkHttpClient.Builder().addInterceptor(interceptor).build();
        Retrofit retrofit = new Retrofit.Builder().client(okClient).baseUrl(s3BaseUrl + "/").build();

        RequestBody requestFile = RequestBody.create(MediaType.parse("image/*"), new File(filePath));
        MultipartBody.Part body = MultipartBody.Part.createFormData("file", fields.get("key"), requestFile);
        Map<String, RequestBody> parameters = new HashMap<>();
        for (Map.Entry<String, String> entry : fields.entrySet()) {
            parameters.put(entry.getKey(), createPartFromString(entry.getValue()));
        }

        AmazonService service = retrofit.create(AmazonService.class);
        Call<ResponseBody> call = service.upload(EMPTY_URL_TO_MAKE_RETROFIT_HAPPY, parameters, body);
        try {
            Response<ResponseBody> execute = call.execute();
            if (execute.code() == 204) {
                return true;
            } else {
                Log.e("AmazonS3Client", "unexpected http response: " + execute.code());
            }
        } catch (IOException e) {
            Log.e("AmazonS3Client", "upload error", e);
        }
        return false;
    }

    private RequestBody createPartFromString(String descriptionString) {
        return RequestBody.create(okhttp3.MultipartBody.FORM, descriptionString);
    }
}

Answer 2

 RestAdapter.Builder builder = new RestAdapter.Builder()
                .setEndpoint("http://" + bucket + ".s3.amazonaws.com")
                .setLogLevel(RestAdapter.LogLevel.FULL)
*<add this line>>>>>*.setRequestInterceptor(new AuthToken())
                .setClient(new OkClient(new OkHttpClient()));

你的AuthToken就像： -

public class AuthToken implements RequestInterceptor
    {
            @Override
            public void apply(RequestFacade request)
        {
            var authTokenString = AWS <Name>:<Key>
            request.addHeader("Authorization", authTokenString);
        }
    }

如何使用Android中的REST API将图像上传到S3存储桶，获取禁止错误：403

2 个答案: