Function on_header_callback

modules/http2d/server.c:688–758

nghttp2_on_header_callback: Called when nghttp2 library emits single header name/value pair. */

/* nghttp2_on_header_callback: Called when nghttp2 library emits
   single header name/value pair. */
static int on_header_callback(nghttp2_session *session,
                              const nghttp2_frame *frame, const uint8_t *name,
                              size_t namelen, const uint8_t *_value,
                              size_t valuelen, uint8_t flags, void *user_data) {
	http2_stream_data *stream_data;
	const char PATH[] = ":path", METHOD[] = ":method";
	char *value = (char *)_value;
	(void)flags;
	(void)user_data;

	if (frame->hd.type != NGHTTP2_HEADERS
	      || frame->headers.cat != NGHTTP2_HCAT_REQUEST)
		return 0;

	stream_data =
	    nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
	if (!stream_data) {
		LM_ERR("failed to fetch data for stream %d\n", frame->hd.stream_id);
		return 0;
	}

	LM_DBG("received hdr(%d) on stream %d: '%.*s' = '%.*s' (%p)\n", frame->hd.type,
	    stream_data->stream_id, (int)namelen, name, (int)valuelen, value, stream_data);

	if (stream_data->path)
		goto store_hdr;

	if (namelen == sizeof(PATH) - 1 && memcmp(PATH, name, namelen) == 0) {
		size_t j;
		for (j = 0; j < valuelen && _value[j] != '?'; ++j)
		  ;
		stream_data->path = percent_decode(_value, j);

		LM_DBG("detected ':path' header, decoded value: '%s'\n", stream_data->path);

		value = stream_data->path;
		valuelen = strlen(value);
	}

store_hdr:
	if (stream_data->hdrs_len + namelen + valuelen > max_headers_size) {
		LM_ERR("max_headers_size exceeded (%d), skipping header: %s\n",
				max_headers_size, name);
		return 0;
	}

	{
		cJSON *val = cJSON_CreateStr(value, valuelen);
		str key = {(char *)name, namelen};

		if (!val) {
			LM_ERR("oom\n");
			return 0;
		}

		_cJSON_AddItemToObject(stream_data->hdrs, &key, val);
		if (!val->string) {
			LM_ERR("oom\n");