Specifying a custom file name for mg_http_upload()

[dmitry-kandiner]

Hello!

In version 7.12, the mg_http_upload() function accepted a path as its parameter. It seems that starting from version 7.13 the function accepts a directory name instead, and taking the file name from the "name" variable of the GET query.
Is there a way to specify a temporary file name instead (other than the name provided in the provided in the query)?

Best regards,
Dmitry

[scaprile]

There is no such function.
If you mean mg_http_upload(), this is its doc https://mongoose.ws/documentation/#mg_http_upload and this tutorial shows how to use it:
https://mongoose.ws/documentation/tutorials/http/file-uploads/#binary-upload-multiple-posts, along with this example https://github.com/cesanta/mongoose/tree/master/tutorials/http/file-upload-multiple-posts
Should there be other way, it would be explained in our docs.
Please see our documentation, and follow the guidelines in our tutorials.

mongoose/src/http.c

Lines 932 to 974 in 22b52f8

	long mg_http_upload(struct mg_connection *c, struct mg_http_message *hm,
	struct mg_fs *fs, const char *dir, size_t max_size) {
	char buf[20] = "0", file[MG_PATH_MAX], path[MG_PATH_MAX];
	long res = 0, offset;
	mg_http_get_var(&hm->query, "offset", buf, sizeof(buf));
	mg_http_get_var(&hm->query, "file", file, sizeof(file));
	offset = strtol(buf, NULL, 0);
	mg_snprintf(path, sizeof(path), "%s%c%s", dir, MG_DIRSEP, file);
	if (hm->body.len == 0) {
	mg_http_reply(c, 200, "", "%ld", res); // Nothing to write
	} else if (file[0] == '\0') {
	mg_http_reply(c, 400, "", "file required");
	res = -1;
	} else if (mg_path_is_sane(mg_str(file)) == false) {
	mg_http_reply(c, 400, "", "%s: invalid file", file);
	res = -2;
	} else if (offset < 0) {
	mg_http_reply(c, 400, "", "offset required");
	res = -3;
	} else if ((size_t) offset + hm->body.len > max_size) {
	mg_http_reply(c, 400, "", "%s: over max size of %lu", path,
	(unsigned long) max_size);
	res = -4;
	} else {
	struct mg_fd *fd;
	size_t current_size = 0;
	MG_DEBUG(("%s -> %lu bytes @ %ld", path, hm->body.len, offset));
	if (offset == 0) fs->rm(path); // If offset if 0, truncate file
	fs->st(path, &current_size, NULL);
	if (offset > 0 && current_size != (size_t) offset) {
	mg_http_reply(c, 400, "", "%s: offset mismatch", path);
	res = -5;
	} else if ((fd = mg_fs_open(fs, path, MG_FS_WRITE)) == NULL) {
	mg_http_reply(c, 400, "", "open(%s): %d", path, errno);
	res = -6;
	} else {
	res = offset + (long) fs->wr(fd->fd, hm->body.buf, hm->body.len);
	mg_fs_close(fd);
	mg_http_reply(c, 200, "", "%ld", res);
	}
	}
	return res;
	}

[dmitry-kandiner]

@scaprile ,
Of course, I meant the mg_http_upload() function. Still, in an older version of it (see the diff ) it accepted a file name with the path as its parameter, while now it only accepts the path, and the file name is extracted from the query itself.
This blocks the option for specifying a custom file name, say, for a temporary file, instead of the one provided in the query.
Be sure I read through the tutorials before posting here.
Best regards,
Dmitry