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/*
* Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku
*
* 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 "h2o.h"
/* used to rewrite status code to the original code */
struct st_errordoc_prefilter_t {
h2o_req_prefilter_t super;
h2o_headers_t req_headers;
int status;
const char *reason;
h2o_headers_t res_headers;
};
/* used to capture an error response */
struct st_errordoc_filter_t {
h2o_filter_t super;
H2O_VECTOR(h2o_errordoc_t) errordocs;
};
static void add_header(h2o_mem_pool_t *pool, h2o_headers_t *headers, const h2o_header_t *header)
{
h2o_vector_reserve(pool, headers, headers->size + 1);
headers->entries[headers->size++] = *header;
}
static void on_prefilter_setup_stream(h2o_req_prefilter_t *_self, h2o_req_t *req, h2o_ostream_t **slot)
{
struct st_errordoc_prefilter_t *self = (void *)_self;
h2o_headers_t headers_merged = {NULL};
size_t i;
/* restore request headers (for logging) and response status */
req->headers = self->req_headers;
req->res.status = self->status;
req->res.reason = self->reason;
/* generate response headers (by merging the preserved and given) */
for (i = 0; i != self->res_headers.size; ++i)
add_header(&req->pool, &headers_merged, self->res_headers.entries + i);
for (i = 0; i != req->res.headers.size; ++i) {
const h2o_header_t *header = req->res.headers.entries + i;
if (header->name == &H2O_TOKEN_CONTENT_TYPE->buf || header->name == &H2O_TOKEN_CONTENT_LANGUAGE->buf ||
header->name == &H2O_TOKEN_SET_COOKIE->buf)
add_header(&req->pool, &headers_merged, header);
}
req->res.headers = headers_merged;
h2o_setup_next_prefilter(&self->super, req, slot);
}
static void on_ostream_send(h2o_ostream_t *self, h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state)
{
/* nothing to do */
}
static int prefilter_is_registered(h2o_req_t *req)
{
h2o_req_prefilter_t *prefilter;
for (prefilter = req->prefilters; prefilter != NULL; prefilter = prefilter->next)
if (prefilter->on_setup_ostream == on_prefilter_setup_stream)
return 1;
return 0;
}
static void on_filter_setup_ostream(h2o_filter_t *_self, h2o_req_t *req, h2o_ostream_t **slot)
{
struct st_errordoc_filter_t *self = (void *)_self;
h2o_errordoc_t *errordoc;
struct st_errordoc_prefilter_t *prefilter;
h2o_iovec_t method;
h2o_ostream_t *ostream;
size_t i;
if (req->res.status >= 400 && !prefilter_is_registered(req)) {
size_t i;
for (i = 0; i != self->errordocs.size; ++i) {
errordoc = self->errordocs.entries + i;
if (errordoc->status == req->res.status)
goto Found;
}
}
/* bypass to the next filter */
h2o_setup_next_ostream(req, slot);
return;
Found:
/* register prefilter that rewrites the status code after the internal redirect is processed */
prefilter = (void *)h2o_add_prefilter(req, sizeof(*prefilter));
prefilter->super.on_setup_ostream = on_prefilter_setup_stream;
prefilter->req_headers = req->headers;
prefilter->status = req->res.status;
prefilter->reason = req->res.reason;
prefilter->res_headers = (h2o_headers_t){NULL};
for (i = 0; i != req->res.headers.size; ++i) {
const h2o_header_t *header = req->res.headers.entries + i;
if (!(header->name == &H2O_TOKEN_CONTENT_TYPE->buf || header->name == &H2O_TOKEN_CONTENT_LANGUAGE->buf))
add_header(&req->pool, &prefilter->res_headers, header);
}
/* redirect internally to the error document */
method = req->method;
if (h2o_memis(method.base, method.len, H2O_STRLIT("POST")))
method = h2o_iovec_init(H2O_STRLIT("GET"));
req->headers = (h2o_headers_t){NULL};
req->res.headers = (h2o_headers_t){NULL};
h2o_send_redirect_internal(req, method, errordoc->url.base, errordoc->url.len, 0);
/* create fake ostream that swallows the contents emitted by the generator */
ostream = h2o_add_ostream(req, sizeof(*ostream), slot);
ostream->do_send = on_ostream_send;
}
void h2o_errordoc_register(h2o_pathconf_t *pathconf, h2o_errordoc_t *errdocs, size_t cnt)
{
struct st_errordoc_filter_t *self = (void *)h2o_create_filter(pathconf, sizeof(*self));
size_t i;
self->super.on_setup_ostream = on_filter_setup_ostream;
h2o_vector_reserve(NULL, &self->errordocs, cnt);
self->errordocs.size = cnt;
for (i = 0; i != cnt; ++i) {
const h2o_errordoc_t *src = errdocs + i;
h2o_errordoc_t *dst = self->errordocs.entries + i;
dst->status = src->status;
dst->url = h2o_strdup(NULL, src->url.base, src->url.len);
}
}
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