How to parse multipart form-data in ulfius ? In the request one is XML file and other is Json String

[KarurNaveen]

curl -v -i -H "Content-Type:multipart/form-data" -F "upload=@pm_omes.xml;type=application/xml" -F "data=@pm.json;type=application/json" http://localhost:8082/FaultManagerService/sendAlarms

[babelouest]

The File Upload paragraph in the API documentation might help you.

When a file is sent in multipart form-data, the file is available in the request->map_post_body as filename (key) => file_content (value), so if you send multiple files in a request, all of them will be available in the request->map_post_body.

If you expect large files to be uploaded, you can also use ulfius_set_upload_file_callback_function to intercept file uploads before they are parsed by the framework.

[KarurNaveen]

Hi @babelouest ,

curl -v -i -H "Content-Type:multipart/form-data" -F "upload=@pm_omes.xml;type=application/xml" -F "data=@pm.json;type=application/json" http://localhost:8082/OMAgentWebService/notificationFile

If i register callback ulfius_set_upload_file_callback_function , I can easily fetch the keys. (upload and data )
But if i dont register upload callback , but only make use of post callback , I am unable to parse the keys.

If i print the keys , i will get only upload_filename.

static int callback_upload_file (const struct _u_request * request, struct _u_response * response, void * user_data)
{
char * url_params = print_map(request->map_url);
char * headers = print_map(request->map_header);
char * cookies = print_map(request->map_cookie);
char * post_params = print_map(request->map_post_body);
char* fileContent = NULL, fileName = NULL;
const char ** keys = NULL;
size_t len = 0 ;
keys = u_map_enum_keys(request->map_post_body);
for(int i=0; keys != NULL && keys[i] != NULL; i++)
{
printf("KEYS: %s\n ",keys[i]);
if(!strcmp("data",keys[i])){

                    fileName = u_map_get(request->map_post_body, keys[i]);
                    char request_body[request->binary_body_length + 1];
                    o_strncpy(request_body, request->binary_body, request->binary_body_length);
   
            } else if(!strcmp("upload", keys[i])){

                    char request_body[request->binary_body_length + 1];
                    o_strncpy(request_body, request->binary_body, request->binary_body_length);


            }else {

            }
     }

}

ulfius_add_endpoint_by_val(&(agent->rest_instance), "POST", "/OMAgentWebService/notificationFile",NULL, 1, &callback_upload_file, agent);

Thanks
Naveen

[babelouest]

In your sample code, you copy request->binary_body, which contains the entire request body content, so the files content and all the metadata around.
The file content is available using u_map_get(request->map_post_body, keys[i]):

printf("filename %s\n", keys[i]);
printf("content %s\n", u_map_get(request->map_post_body, keys[i]));