Upload big files directly to S3-compatible storage. Support chunked upload. Cloud native.

v0.1 - base functions: upload files with multipart\form-data, callbacks, download files by uuid

v0.2 - add upload metrics

v0.3 - add upload by WebSockets

1. Frontend application make POST Json Request to /upload/start endpoint. In this request MUST BE the field with name, defined by uploader.infoFieldName config key (default is: _uploader_info). Under this filed MUST BE a integer field file_size with size of uploaded file in bytes. Also supports: string field uuid - if you wont generate uuid (filename) at frontend, and object of pair strings user_tags - if you need tagged file on storage. You can define any other fields and headers of request - they will passed on callbackBefore.

Sample request:

POST http:https://localhost:8080/upload/start
Content-Type: application/json
Access-Token: qwiluergcnkrctmkaejr

{
  "_uploader_info": {
    "file_size": 60000000,
    "user_tags": {"tag": "test"}
  },
  "custom_info": {}
}

2. Filup make POST Request to uploader.callbackBefore with body and headers of request from (1). To body under uploader.infoFieldName will be added uuid field with uuid of file (if it was not already there), and chunks_info - information about the chunks of the uploaded file
3. Backend server can check any information from request (for example - authorization) and response to filup with some HTTP code and body
4. If backend server response with 2xx code, Filup save some meta information in storage and
5. Response to frontend with meta information, such as chunks_info. Frontend application MUST send chunks with names and size from meta information.
6. If an error is received from backend server, it will be translated unchanged (same code and body)

7. Frontend application make POST with multipart/form-data to /upload/part endpoint. Filename MUST BE from chunks meta information. Sample request:

POST http:https://localhost:8080/upload/part
Content-Type: multipart/form-data; boundary=RaNdOmDeLiMiTeR

--RaNdOmDeLiMiTeR
Content-Disposition: form-data; name=part; filename="870915da-76bb-11ec-8686-e4e7494803df_part_0"

ojioeprtfoertfowerjtfioer,t;d,oersmvfylisdjr,fst;d,osfimbyjihldrtdk
dsfafdsfas
asdfadsfadsf
--RaNdOmDeLiMiTeR--

8. Filup save chunk, if name is correct, to storage'

9 - 14. Filup checks - if all chunks is uploaded, then storage compose object. Than Filup make POST JsonRequest with meta information (such as uuid) to uploader.callbackAfter. If backend don't response with 2xx code, there will be several retires (defined by uploader.httpRetries). Regardless of success repsponse from backend, to frontend 204 OK will be sent.

15. If not all chunks already uploaded - Http Code 100 will be sent to frontend.