mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-22 22:41:30 +03:00
289 lines
6.9 KiB
C
289 lines
6.9 KiB
C
/*
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* Copyright 2011 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf.
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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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/* resource: URL handling. Based on the data fetcher by Rob Kendrick */
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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 <dirent.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 "content/dirlist.h"
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#include "content/fetch.h"
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#include "content/fetchers/resource.h"
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#include "content/urldb.h"
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#include "desktop/netsurf.h"
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#include "desktop/options.h"
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#include "utils/log.h"
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#include "utils/messages.h"
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#include "utils/url.h"
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#include "utils/utils.h"
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#include "utils/ring.h"
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struct fetch_resource_context;
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typedef bool (*fetch_resource_handler)(struct fetch_resource_context *);
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/** Context for an resource fetch */
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struct fetch_resource_context {
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struct fetch_resource_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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char *url;
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char *redirect_url; /**< The url the fetch redirects to */
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fetch_resource_handler handler;
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};
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static struct fetch_resource_context *ring = NULL;
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/** issue fetch callbacks with locking */
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static inline bool fetch_resource_send_callback(fetch_msg msg,
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struct fetch_resource_context *ctx, const void *data,
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unsigned long size, fetch_error_code errorcode)
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{
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ctx->locked = true;
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fetch_send_callback(msg, ctx->fetchh, data, size, errorcode);
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ctx->locked = false;
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return ctx->aborted;
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}
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static bool fetch_resource_send_header(struct fetch_resource_context *ctx,
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const char *fmt, ...)
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{
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char header[64];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(header, sizeof header, fmt, ap);
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va_end(ap);
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fetch_resource_send_callback(FETCH_HEADER, ctx, header, strlen(header),
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FETCH_ERROR_NO_ERROR);
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return ctx->aborted;
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}
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static bool fetch_resource_redirect_handler(struct fetch_resource_context *ctx)
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{
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/* content is going to return redirect */
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fetch_set_http_code(ctx->fetchh, 302);
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fetch_resource_send_callback(FETCH_REDIRECT, ctx, ctx->redirect_url, 0,
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FETCH_ERROR_NO_ERROR);
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return true;
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}
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static bool fetch_resource_notfound_handler(struct fetch_resource_context *ctx)
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{
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int code = 404;
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char buffer[1024];
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const char *title;
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char key[8];
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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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/* content type */
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if (fetch_resource_send_header(ctx, "Content-Type: text/html"))
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goto fetch_resource_notfound_handler_aborted;
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snprintf(key, sizeof key, "HTTP%03d", code);
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title = messages_get(key);
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snprintf(buffer, sizeof buffer, "<html><head><title>%s</title></head>"
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"<body><h1>%s</h1>"
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"<p>Error %d while fetching file %s</p></body></html>",
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title, title, code, ctx->url);
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if (fetch_resource_send_callback(FETCH_DATA, ctx, buffer, strlen(buffer),
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FETCH_ERROR_NO_ERROR))
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goto fetch_resource_notfound_handler_aborted;
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fetch_resource_send_callback(FETCH_FINISHED, ctx, 0, 0,
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FETCH_ERROR_NO_ERROR);
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fetch_resource_notfound_handler_aborted:
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return false;
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}
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/** callback to initialise the resource fetcher. */
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static bool fetch_resource_initialise(lwc_string *scheme)
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{
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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 void fetch_resource_finalise(lwc_string *scheme)
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{
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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_resource_setup(struct fetch *fetchh,
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const char *url,
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bool only_2xx,
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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_resource_context *ctx;
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struct url_components urlcomp;
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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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url_get_components(url, &urlcomp);
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ctx->redirect_url = gui_get_resource_url(urlcomp.path);
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if (ctx->redirect_url == NULL) {
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ctx->handler = fetch_resource_notfound_handler;
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} else {
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ctx->handler = fetch_resource_redirect_handler;
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}
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ctx->url = strdup(url);
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url_destroy_components(&urlcomp);
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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_resource_free(void *ctx)
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{
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struct fetch_resource_context *c = ctx;
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free(c->redirect_url);
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free(c->url);
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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_resource_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_resource_abort(void *ctx)
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{
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struct fetch_resource_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_resource_poll(lwc_string *scheme)
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{
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struct fetch_resource_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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c->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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void fetch_resource_register(void)
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{
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lwc_string *scheme;
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if (lwc_intern_string("resource", SLEN("resource"),
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&scheme) != lwc_error_ok) {
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die("Failed to initialise the fetch module "
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"(couldn't intern \"resource\").");
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}
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fetch_add_fetcher(scheme,
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fetch_resource_initialise,
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fetch_resource_setup,
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fetch_resource_start,
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fetch_resource_abort,
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fetch_resource_free,
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fetch_resource_poll,
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fetch_resource_finalise);
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}
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