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/*
* Copyright (c) 2014 DeNA Co., Ltd.
*
* 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 <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "h2o.h"
typedef struct st_chunked_encoder_t {
h2o_ostream_t super;
char buf[64];
} chunked_encoder_t;
static void send_chunk(h2o_ostream_t *_self, h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state)
{
chunked_encoder_t *self = (void *)_self;
h2o_iovec_t *outbufs = alloca(sizeof(h2o_iovec_t) * (inbufcnt + 2));
size_t chunk_size, outbufcnt = 0, i;
/* calc chunk size */
chunk_size = 0;
for (i = 0; i != inbufcnt; ++i)
chunk_size += inbufs[i].len;
req->bytes_sent += chunk_size;
/* create chunk header and output data */
if (chunk_size != 0) {
outbufs[outbufcnt].base = self->buf;
outbufs[outbufcnt].len = sprintf(self->buf, "%zx\r\n", chunk_size);
assert(outbufs[outbufcnt].len < sizeof(self->buf));
outbufcnt++;
memcpy(outbufs + outbufcnt, inbufs, sizeof(h2o_iovec_t) * inbufcnt);
outbufcnt += inbufcnt;
if (state != H2O_SEND_STATE_ERROR) {
outbufs[outbufcnt].base = "\r\n0\r\n\r\n";
outbufs[outbufcnt].len = state == H2O_SEND_STATE_FINAL ? 7 : 2;
outbufcnt++;
}
} else if (state == H2O_SEND_STATE_FINAL) {
outbufs[outbufcnt].base = "0\r\n\r\n";
outbufs[outbufcnt].len = 5;
outbufcnt++;
}
/* if state is error, send a broken chunk to pass the error down to the browser */
if (state == H2O_SEND_STATE_ERROR) {
outbufs[outbufcnt].base = "\r\n1\r\n";
outbufs[outbufcnt].len = 5;
outbufcnt++;
}
h2o_ostream_send_next(&self->super, req, outbufs, outbufcnt, state);
}
static void on_setup_ostream(h2o_filter_t *self, h2o_req_t *req, h2o_ostream_t **slot)
{
chunked_encoder_t *encoder;
/* do nothing if not HTTP/1.1 or content-length is known */
if (req->res.content_length != SIZE_MAX || req->version != 0x101)
goto Next;
/* RFC 2616 4.4 states that the following status codes (and response to a HEAD method) should not include message body */
if ((100 <= req->res.status && req->res.status <= 199) || req->res.status == 204 || req->res.status == 304)
goto Next;
else if (h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("HEAD")))
goto Next;
/* we cannot handle certain responses (like 101 switching protocols) */
if (req->res.status != 200) {
req->http1_is_persistent = 0;
goto Next;
}
/* skip if content-encoding header is being set */
if (h2o_find_header(&req->res.headers, H2O_TOKEN_TRANSFER_ENCODING, -1) != -1)
goto Next;
/* set content-encoding header */
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_TRANSFER_ENCODING, NULL, H2O_STRLIT("chunked"));
/* set the flag that tells finalostream that req->bytes_sent is already counted */
req->bytes_counted_by_ostream = 1;
/* setup filter */
encoder = (void *)h2o_add_ostream(req, sizeof(chunked_encoder_t), slot);
encoder->super.do_send = send_chunk;
slot = &encoder->super.next;
Next:
h2o_setup_next_ostream(req, slot);
}
void h2o_chunked_register(h2o_pathconf_t *pathconf)
{
h2o_filter_t *self = h2o_create_filter(pathconf, sizeof(*self));
self->on_setup_ostream = on_setup_ostream;
}
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