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-rw-r--r--content/fetchers/resource.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/content/fetchers/resource.c b/content/fetchers/resource.c
new file mode 100644
index 000000000..2818305d0
--- /dev/null
+++ b/content/fetchers/resource.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright 2011 Vincent Sanders <vince@netsurf-browser.org>
+ *
+ * This file is part of NetSurf.
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* resource: URL handling. Based on the data fetcher by Rob Kendrick */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <inttypes.h>
+#include <string.h>
+#include <strings.h>
+#include <time.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <limits.h>
+#include <stdarg.h>
+
+#include "utils/config.h"
+#include "content/dirlist.h"
+#include "content/fetch.h"
+#include "content/fetchers/resource.h"
+#include "content/urldb.h"
+#include "desktop/netsurf.h"
+#include "desktop/options.h"
+#include "utils/log.h"
+#include "utils/messages.h"
+#include "utils/url.h"
+#include "utils/utils.h"
+#include "utils/ring.h"
+
+struct fetch_resource_context;
+
+typedef bool (*fetch_resource_handler)(struct fetch_resource_context *);
+
+/** Context for an resource fetch */
+struct fetch_resource_context {
+ struct fetch_resource_context *r_next, *r_prev;
+
+ struct fetch *fetchh; /**< Handle for this fetch */
+
+ bool aborted; /**< Flag indicating fetch has been aborted */
+ bool locked; /**< Flag indicating entry is already entered */
+
+ char *url;
+ char *redirect_url; /**< The url the fetch redirects to */
+
+ fetch_resource_handler handler;
+};
+
+static struct fetch_resource_context *ring = NULL;
+
+/** issue fetch callbacks with locking */
+static inline bool fetch_resource_send_callback(fetch_msg msg,
+ struct fetch_resource_context *ctx, const void *data,
+ unsigned long size, fetch_error_code errorcode)
+{
+ ctx->locked = true;
+ fetch_send_callback(msg, ctx->fetchh, data, size, errorcode);
+ ctx->locked = false;
+
+ return ctx->aborted;
+}
+
+static bool fetch_resource_send_header(struct fetch_resource_context *ctx,
+ const char *fmt, ...)
+{
+ char header[64];
+ va_list ap;
+
+ va_start(ap, fmt);
+
+ vsnprintf(header, sizeof header, fmt, ap);
+
+ va_end(ap);
+
+ fetch_resource_send_callback(FETCH_HEADER, ctx, header, strlen(header),
+ FETCH_ERROR_NO_ERROR);
+
+ return ctx->aborted;
+}
+
+
+
+
+static bool fetch_resource_redirect_handler(struct fetch_resource_context *ctx)
+{
+ /* content is going to return redirect */
+ fetch_set_http_code(ctx->fetchh, 302);
+
+ fetch_resource_send_callback(FETCH_REDIRECT, ctx, ctx->redirect_url, 0,
+ FETCH_ERROR_NO_ERROR);
+
+ return true;
+}
+
+
+static bool fetch_resource_notfound_handler(struct fetch_resource_context *ctx)
+{
+ int code = 404;
+ char buffer[1024];
+ const char *title;
+ char key[8];
+
+ /* content is going to return error code */
+ fetch_set_http_code(ctx->fetchh, code);
+
+ /* content type */
+ if (fetch_resource_send_header(ctx, "Content-Type: text/html"))
+ goto fetch_resource_notfound_handler_aborted;
+
+ snprintf(key, sizeof key, "HTTP%03d", code);
+ title = messages_get(key);
+
+ snprintf(buffer, sizeof buffer, "<html><head><title>%s</title></head>"
+ "<body><h1>%s</h1>"
+ "<p>Error %d while fetching file %s</p></body></html>",
+ title, title, code, ctx->url);
+
+ if (fetch_resource_send_callback(FETCH_DATA, ctx, buffer, strlen(buffer),
+ FETCH_ERROR_NO_ERROR))
+ goto fetch_resource_notfound_handler_aborted;
+
+ fetch_resource_send_callback(FETCH_FINISHED, ctx, 0, 0,
+ FETCH_ERROR_NO_ERROR);
+
+fetch_resource_notfound_handler_aborted:
+ return false;
+}
+
+
+
+/** callback to initialise the resource fetcher. */
+static bool fetch_resource_initialise(const char *scheme)
+{
+ return true;
+}
+
+/** callback to initialise the resource fetcher. */
+static void fetch_resource_finalise(const char *scheme)
+{
+}
+
+/** callback to set up a resource fetch context. */
+static void *
+fetch_resource_setup(struct fetch *fetchh,
+ const char *url,
+ bool only_2xx,
+ const char *post_urlenc,
+ const struct fetch_multipart_data *post_multipart,
+ const char **headers)
+{
+ struct fetch_resource_context *ctx;
+ struct url_components urlcomp;
+
+ ctx = calloc(1, sizeof(*ctx));
+ if (ctx == NULL)
+ return NULL;
+
+ url_get_components(url, &urlcomp);
+
+ ctx->redirect_url = gui_find_resource(urlcomp.path);
+ if (ctx->redirect_url == NULL) {
+ ctx->handler = fetch_resource_notfound_handler;
+ } else {
+ ctx->handler = fetch_resource_redirect_handler;
+ }
+
+ ctx->url = strdup(url);
+
+ url_destroy_components(&urlcomp);
+
+ ctx->fetchh = fetchh;
+
+ RING_INSERT(ring, ctx);
+
+ return ctx;
+}
+
+/** callback to free a resource fetch */
+static void fetch_resource_free(void *ctx)
+{
+ struct fetch_resource_context *c = ctx;
+ free(c->redirect_url);
+ free(c->url);
+ RING_REMOVE(ring, c);
+ free(ctx);
+}
+
+/** callback to start a resource fetch */
+static bool fetch_resource_start(void *ctx)
+{
+ return true;
+}
+
+/** callback to abort a resource fetch */
+static void fetch_resource_abort(void *ctx)
+{
+ struct fetch_resource_context *c = ctx;
+
+ /* To avoid the poll loop having to deal with the fetch context
+ * disappearing from under it, we simply flag the abort here.
+ * The poll loop itself will perform the appropriate cleanup.
+ */
+ c->aborted = true;
+}
+
+
+/** callback to poll for additional resource fetch contents */
+static void fetch_resource_poll(const char *scheme)
+{
+ struct fetch_resource_context *c, *next;
+
+ if (ring == NULL) return;
+
+ /* Iterate over ring, processing each pending fetch */
+ c = ring;
+ do {
+ /* Take a copy of the next pointer as we may destroy
+ * the ring item we're currently processing */
+ next = c->r_next;
+
+ /* Ignore fetches that have been flagged as locked.
+ * This allows safe re-entrant calls to this function.
+ * Re-entrancy can occur if, as a result of a callback,
+ * the interested party causes fetch_poll() to be called
+ * again.
+ */
+ if (c->locked == true) {
+ continue;
+ }
+
+ /* Only process non-aborted fetches */
+ if (c->aborted == false) {
+ /* resource fetches can be processed in one go */
+ c->handler(c);
+ }
+
+
+ fetch_remove_from_queues(c->fetchh);
+ fetch_free(c->fetchh);
+
+ /* Advance to next ring entry, exiting if we've reached
+ * the start of the ring or the ring has become empty
+ */
+ } while ( (c = next) != ring && ring != NULL);
+}
+
+void fetch_resource_register(void)
+{
+ fetch_add_fetcher("resource",
+ fetch_resource_initialise,
+ fetch_resource_setup,
+ fetch_resource_start,
+ fetch_resource_abort,
+ fetch_resource_free,
+ fetch_resource_poll,
+ fetch_resource_finalise);
+}