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/**
*
* Response body compression callback function for Ulfius Framework
*
* Copyright 2020-2022 Nicolas Mora <mail@babelouest.org>
*
* Version 20221024
*
* Compress the response body using `deflate` or `gzip` depending on the request header `Accept-Encoding` and the callback configuration.
* The rest of the response, status, headers, cookies won't change.
* After compressing response body, the response header Content-Encoding will be set accordingly.
*
* The MIT License (MIT)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <string.h>
#include <ulfius.h>
#include <zlib.h>
#include "http_compression_callback.h"
#define U_COMPRESS_NONE 0
#define U_COMPRESS_GZIP 1
#define U_COMPRESS_DEFL 2
#define U_ACCEPT_HEADER "Accept-Encoding"
#define U_CONTENT_HEADER "Content-Encoding"
#define U_ACCEPT_GZIP "gzip"
#define U_ACCEPT_DEFLATE "deflate"
#define U_GZIP_WINDOW_BITS 15
#define U_GZIP_ENCODING 16
#define CHUNK 0x4000
static void * u_zalloc(void * q, unsigned n, unsigned m) {
(void)q;
return o_malloc((size_t) n * m);
}
static void u_zfree(void *q, void *p) {
(void)q;
o_free(p);
}
int callback_http_compression (const struct _u_request * request, struct _u_response * response, void * user_data) {
struct _http_compression_config * config = (struct _http_compression_config *)user_data;
char ** accept_list = NULL;
int ret = U_CALLBACK_IGNORE, compress_mode = U_COMPRESS_NONE, res;
z_stream defstream;
char * data_zip = NULL;
size_t data_zip_len = 0;
if (response->binary_body_length && u_map_has_key_case(request->map_header, U_ACCEPT_HEADER)) {
if (split_string(u_map_get_case(request->map_header, U_ACCEPT_HEADER), ",", &accept_list)) {
if ((config == NULL || config->allow_gzip) && string_array_has_trimmed_value((const char **)accept_list, U_ACCEPT_GZIP)) {
compress_mode = U_COMPRESS_GZIP;
} else if ((config == NULL || config->allow_deflate) && string_array_has_trimmed_value((const char **)accept_list, U_ACCEPT_DEFLATE)) {
compress_mode = U_COMPRESS_DEFL;
}
if (compress_mode != U_COMPRESS_NONE) {
defstream.zalloc = u_zalloc;
defstream.zfree = u_zfree;
defstream.opaque = Z_NULL;
defstream.avail_in = (uInt)response->binary_body_length;
defstream.next_in = (Bytef *)response->binary_body;
if (compress_mode == U_COMPRESS_GZIP) {
if (deflateInit2(&defstream,
Z_BEST_COMPRESSION,
Z_DEFLATED,
U_GZIP_WINDOW_BITS | U_GZIP_ENCODING,
8,
Z_DEFAULT_STRATEGY) != Z_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "callback_http_compression - Error deflateInit (gzip)");
ret = U_CALLBACK_ERROR;
}
} else {
if (deflateInit(&defstream, Z_BEST_COMPRESSION) != Z_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "callback_http_compression - Error deflateInit (deflate)");
ret = U_CALLBACK_ERROR;
}
}
if (ret == U_CALLBACK_IGNORE) {
do {
if ((data_zip = o_realloc(data_zip, data_zip_len+_U_C_BLOCK_SIZE)) != NULL) {
defstream.avail_out = _U_C_BLOCK_SIZE;
defstream.next_out = ((Bytef *)data_zip)+data_zip_len;
switch ((res = deflate(&defstream, Z_FINISH))) {
case Z_OK:
case Z_STREAM_END:
case Z_BUF_ERROR:
break;
default:
y_log_message(Y_LOG_LEVEL_ERROR, "callback_http_compression - Error deflate %d", res);
ret = U_CALLBACK_ERROR;
break;
}
data_zip_len += _U_C_BLOCK_SIZE - defstream.avail_out;
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "callback_http_compression - Error allocating resources for data_zip");
ret = U_CALLBACK_ERROR;
}
} while (U_CALLBACK_IGNORE == ret && defstream.avail_out == 0);
if (ret == U_CALLBACK_IGNORE) {
ulfius_set_binary_body_response(response, (unsigned int)response->status, (const char *)data_zip, defstream.total_out);
u_map_put(response->map_header, U_CONTENT_HEADER, compress_mode==U_COMPRESS_GZIP?U_ACCEPT_GZIP:U_ACCEPT_DEFLATE);
}
deflateEnd(&defstream);
o_free(data_zip);
}
}
}
free_string_array(accept_list);
}
return ret;
}
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