237 lines
5.7 KiB
C
237 lines
5.7 KiB
C
/*
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* Copyright 2012 Vincent Sanders <vince@kyllikki.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* implementation for javascript scheme fetcher
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*
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* This fetcher implements http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#javascript-protocol
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <string.h>
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#include <strings.h>
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#include <time.h>
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#include <stdio.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <libwapcaplet/libwapcaplet.h>
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#include "utils/config.h"
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#include "utils/errors.h"
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#include "utils/corestrings.h"
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#include "utils/nsoption.h"
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#include "utils/log.h"
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#include "utils/messages.h"
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#include "utils/utils.h"
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#include "utils/ring.h"
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#include "content/fetch.h"
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#include "content/fetchers.h"
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#include "javascript/fetcher.h"
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#include "content/urldb.h"
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/** Context for an resource fetch */
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struct fetch_javascript_context {
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struct fetch_javascript_context *r_next, *r_prev;
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struct fetch *fetchh; /**< Handle for this fetch */
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bool aborted; /**< Flag indicating fetch has been aborted */
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bool locked; /**< Flag indicating entry is already entered */
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nsurl *url;
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};
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static struct fetch_javascript_context *ring = NULL;
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/** issue fetch callbacks with locking */
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static inline bool fetch_javascript_send_callback(const fetch_msg *msg,
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struct fetch_javascript_context *ctx)
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{
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ctx->locked = true;
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fetch_send_callback(msg, ctx->fetchh);
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ctx->locked = false;
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return ctx->aborted;
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}
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/**
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* called from poll to progress fetch.
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*
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* \todo This is currently completely unimplemented and just returns 204
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*/
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static bool fetch_javascript_handler(struct fetch_javascript_context *ctx)
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{
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fetch_msg msg;
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int code = 204;
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/* content is going to return error code */
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fetch_set_http_code(ctx->fetchh, code);
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msg.type = FETCH_FINISHED;
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fetch_javascript_send_callback(&msg, ctx);
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return true;
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}
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/** callback to initialise the resource fetcher. */
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static bool fetch_javascript_initialise(lwc_string *scheme)
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{
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return true;
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}
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/** callback to finalise the resource fetcher. */
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static void fetch_javascript_finalise(lwc_string *scheme)
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{
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}
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static bool fetch_javascript_can_fetch(const nsurl *url)
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{
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return true;
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}
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/** callback to set up a resource fetch context. */
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static void *
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fetch_javascript_setup(struct fetch *fetchh,
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nsurl *url,
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bool only_2xx,
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bool downgrade_tls,
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const char *post_urlenc,
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const struct fetch_multipart_data *post_multipart,
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const char **headers)
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{
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struct fetch_javascript_context *ctx;
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ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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ctx->url = nsurl_ref(url);
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ctx->fetchh = fetchh;
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RING_INSERT(ring, ctx);
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return ctx;
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}
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/** callback to free a resource fetch */
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static void fetch_javascript_free(void *ctx)
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{
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struct fetch_javascript_context *c = ctx;
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if (c->url != NULL) {
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nsurl_unref(c->url);
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}
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RING_REMOVE(ring, c);
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free(ctx);
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}
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/** callback to start a resource fetch */
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static bool fetch_javascript_start(void *ctx)
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{
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return true;
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}
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/** callback to abort a resource fetch */
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static void fetch_javascript_abort(void *ctx)
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{
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struct fetch_javascript_context *c = ctx;
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/* To avoid the poll loop having to deal with the fetch context
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* disappearing from under it, we simply flag the abort here.
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* The poll loop itself will perform the appropriate cleanup.
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*/
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c->aborted = true;
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}
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/** callback to poll for additional resource fetch contents */
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static void fetch_javascript_poll(lwc_string *scheme)
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{
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struct fetch_javascript_context *c, *next;
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if (ring == NULL) return;
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/* Iterate over ring, processing each pending fetch */
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c = ring;
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do {
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/* Ignore fetches that have been flagged as locked.
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* This allows safe re-entrant calls to this function.
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* Re-entrancy can occur if, as a result of a callback,
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* the interested party causes fetch_poll() to be called
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* again.
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*/
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if (c->locked == true) {
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next = c->r_next;
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continue;
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}
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/* Only process non-aborted fetches */
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if (c->aborted == false) {
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/* resource fetches can be processed in one go */
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fetch_javascript_handler(c);
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}
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/* Compute next fetch item at the last possible moment
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* as processing this item may have added to the ring
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*/
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next = c->r_next;
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fetch_remove_from_queues(c->fetchh);
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fetch_free(c->fetchh);
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/* Advance to next ring entry, exiting if we've reached
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* the start of the ring or the ring has become empty
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*/
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} while ( (c = next) != ring && ring != NULL);
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}
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/**
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* Register javascript scheme fetcher with fetcher factory.
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*
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* \return NSERROR_OK on success or appropriate error code on faliure.
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*/
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nserror fetch_javascript_register(void)
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{
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lwc_string *scheme = lwc_string_ref(corestring_lwc_javascript);
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const struct fetcher_operation_table fetcher_ops = {
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.initialise = fetch_javascript_initialise,
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.acceptable = fetch_javascript_can_fetch,
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.setup = fetch_javascript_setup,
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.start = fetch_javascript_start,
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.abort = fetch_javascript_abort,
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.free = fetch_javascript_free,
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.poll = fetch_javascript_poll,
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.finalise = fetch_javascript_finalise
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};
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return fetcher_add(scheme, &fetcher_ops);
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}
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