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https://github.com/netsurf-browser/netsurf
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Add a redirecting fetcher for the doi: URI scheme. Not much used but just in case...
svn path=/trunk/netsurf/; revision=12412
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6c2977ec29
commit
d25e5568bb
@ -7,7 +7,7 @@
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S_CONTENT := content.c content_factory.c dirlist.c fetch.c hlcache.c \
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llcache.c urldb.c
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S_FETCHERS := curl.c data.c file.c about.c resource.c
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S_FETCHERS := curl.c data.c doi.c file.c about.c resource.c
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S_CSS := css.c dump.c internal.c select.c utils.c
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@ -42,6 +42,7 @@
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#include "content/fetchers/about.h"
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#include "content/fetchers/curl.h"
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#include "content/fetchers/data.h"
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#include "content/fetchers/doi.h"
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#include "content/fetchers/file.h"
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#include "content/urldb.h"
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#include "desktop/netsurf.h"
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@ -112,6 +113,7 @@ void fetch_init(void)
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{
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fetch_curl_register();
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fetch_data_register();
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fetch_doi_register();
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fetch_file_register();
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fetch_resource_register();
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fetch_about_register();
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207
content/fetchers/doi.c
Normal file
207
content/fetchers/doi.c
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@ -0,0 +1,207 @@
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/*
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* Copyright 2011 François Revol <mmu_man@users.sourceforge.net>
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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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/* doi: URL handling. Based on the resource fetcher by Vincent Sanders */
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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 "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/doi.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_doi_context;
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/** Context for an resource fetch */
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struct fetch_doi_context {
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struct fetch_doi_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 redirect_url[1]; /**< The url the fetch redirects to */
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};
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static struct fetch_doi_context *ring = NULL;
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static const char *fetch_doi_redirect_base = "http://dx.doi.org/";
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/** issue fetch callbacks with locking */
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static inline bool fetch_doi_send_callback(fetch_msg msg,
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struct fetch_doi_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_doi_redirect_handler(struct fetch_doi_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_doi_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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/** callback to initialise the resource fetcher. */
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static bool fetch_doi_initialise(const char *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_doi_finalise(const char *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_doi_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_doi_context *ctx;
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ctx = calloc(1, sizeof(*ctx) + strlen(fetch_doi_redirect_base) +
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strlen(url) + 1);
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if (ctx == NULL)
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return NULL;
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sprintf(ctx->redirect_url, "%s%s", fetch_doi_redirect_base,
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url + SLEN("doi:"));
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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_doi_free(void *ctx)
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{
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struct fetch_doi_context *c = ctx;
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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_doi_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_doi_abort(void *ctx)
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{
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struct fetch_doi_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_doi_poll(const char *scheme)
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{
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struct fetch_doi_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_doi_redirect_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_doi_register(void)
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{
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fetch_add_fetcher("doi",
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fetch_doi_initialise,
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fetch_doi_setup,
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fetch_doi_start,
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fetch_doi_abort,
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fetch_doi_free,
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fetch_doi_poll,
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fetch_doi_finalise);
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}
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38
content/fetchers/doi.h
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38
content/fetchers/doi.h
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@ -0,0 +1,38 @@
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/*
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* Copyright 2011 François Revol <mmu_man@users.sourceforge.net>
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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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/** \file
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* doi: URL method handler.
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*
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* The doi fetcher is intended to provide a redirection of doi URLs
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* to the canonical doi website accessible via HTTP.
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* cf. http://tools.ietf.org/html/draft-paskin-doi-uri
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*
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*/
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#ifndef NETSURF_CONTENT_FETCHERS_FETCH_DOI_H
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#define NETSURF_CONTENT_FETCHERS_FETCH_DOI_H
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/**
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* Register the resource scheme.
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*
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* should only be called from the fetch initialise
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*/
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void fetch_doi_register(void);
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#endif
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