From fa98e3d76ada300d69e04816bfe15b2d560c9f7d Mon Sep 17 00:00:00 2001
From: Vincent Sanders <vince@netsurf-browser.org>
Date: Tue, 15 Feb 2011 23:18:10 +0000
Subject: add about: fetcher rename fetchers to be more sensible

svn path=/trunk/netsurf/; revision=11692
---
 content/fetchers/about.c | 315 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 315 insertions(+)
 create mode 100644 content/fetchers/about.c

(limited to 'content/fetchers/about.c')

diff --git a/content/fetchers/about.c b/content/fetchers/about.c
new file mode 100644
index 000000000..c0507aaa4
--- /dev/null
+++ b/content/fetchers/about.c
@@ -0,0 +1,315 @@
+/*
+ * 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/>.
+ */
+
+/* about: 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/about.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_about_context;
+
+typedef bool (*fetch_about_handler)(struct fetch_about_context *);
+
+/** Context for an about fetch */
+struct fetch_about_context {
+	struct fetch_about_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; /**< The full url the fetch refers to */
+
+	fetch_about_handler handler;
+};
+
+static struct fetch_about_context *ring = NULL;
+
+/** issue fetch callbacks with locking */
+static inline bool fetch_about_send_callback(fetch_msg msg,
+		struct fetch_about_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_about_send_header(struct fetch_about_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_about_send_callback(FETCH_HEADER, ctx, header, strlen(header),
+			FETCH_ERROR_NO_ERROR);
+
+	return ctx->aborted;
+}
+
+
+
+
+static bool fetch_about_blank_handler(struct fetch_about_context *ctx)
+{
+	char buffer[2];
+	int code = 200;
+
+	/* content is going to return ok */
+	fetch_set_http_code(ctx->fetchh, code);
+
+	/* content type */
+	if (fetch_about_send_header(ctx, "Content-Type: text/html"))
+		goto fetch_about_blank_handler_aborted;
+
+	buffer[0] = ' ';
+	buffer[1] = 0;
+	if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, strlen(buffer),
+			FETCH_ERROR_NO_ERROR))
+		goto fetch_about_blank_handler_aborted;
+
+	fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
+			FETCH_ERROR_NO_ERROR);
+
+	return true;
+
+fetch_about_blank_handler_aborted:
+	return false;
+}
+
+static const char *authors[] = {
+		"John-Mark Bell", "James Bursa", "Michael Drake",
+		"Rob Kendrick", "Adrian Lees", "Vincent Sanders",
+		"Daniel Silverstone", "Richard Wilson", NULL
+};
+
+static bool fetch_about_credits_handler(struct fetch_about_context *ctx)
+{
+	char buffer[4096];
+	int code = 200;
+	int slen;
+	int auth_loop = 0;
+
+	/* content is going to return ok */
+	fetch_set_http_code(ctx->fetchh, code);
+
+	/* content type */
+	if (fetch_about_send_header(ctx, "Content-Type: text/html"))
+		goto fetch_about_credits_handler_aborted;
+
+	slen = snprintf(buffer, sizeof buffer, 
+		 "<html><head><title>NetSurf Browser Credits</title></head>"
+		 "<body><h1>NetSurf Browser Credits</h1>"
+		 "<p>Authors</p>"
+		 "<ul>");
+
+	while (authors[auth_loop] != NULL) {
+		slen += snprintf(buffer + slen, sizeof buffer - slen, 
+				 "<li>%s</li>", authors[auth_loop]);
+		auth_loop++;
+	}
+
+	slen += snprintf(buffer + slen, sizeof buffer - slen, 
+			 "</ul></body></html>");
+
+	if (fetch_about_send_callback(FETCH_DATA, ctx, buffer, slen,
+			FETCH_ERROR_NO_ERROR))
+		goto fetch_about_credits_handler_aborted;
+
+	fetch_about_send_callback(FETCH_FINISHED, ctx, 0, 0,
+			FETCH_ERROR_NO_ERROR);
+
+	return true;
+
+fetch_about_credits_handler_aborted:
+	return false;
+}
+
+struct about_handlers {
+	const char *name;
+	fetch_about_handler handler;
+};
+
+struct about_handlers about_handler_list[] = { 
+	{ "credits", fetch_about_credits_handler },
+	{ "blank", fetch_about_blank_handler } /* The default */
+};
+
+#define about_handler_list_len (sizeof(about_handler_list) / sizeof(struct about_handlers))
+
+/** callback to initialise the about fetcher. */
+static bool fetch_about_initialise(const char *scheme)
+{
+	return true;
+}
+
+/** callback to initialise the about fetcher. */
+static void fetch_about_finalise(const char *scheme)
+{
+}
+
+/** callback to set up a about fetch context. */
+static void *
+fetch_about_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_about_context *ctx;
+	unsigned int handler_loop;
+	struct url_components urlcomp;
+
+	ctx = calloc(1, sizeof(*ctx));
+	if (ctx == NULL)
+		return NULL;
+
+	url_get_components(url, &urlcomp);
+
+	for (handler_loop = 0; 
+	     handler_loop < about_handler_list_len; 
+	     handler_loop++) {
+		ctx->handler = about_handler_list[handler_loop].handler;
+		if (strcmp(about_handler_list[handler_loop].name, urlcomp.path) == 0)
+			break;
+	}
+
+	url_destroy_components(&urlcomp);
+
+	ctx->fetchh = fetchh;
+
+	RING_INSERT(ring, ctx);
+
+	return ctx;
+}
+
+/** callback to free a about fetch */
+static void fetch_about_free(void *ctx)
+{
+	struct fetch_about_context *c = ctx;
+	free(c->url);
+	RING_REMOVE(ring, c);
+	free(ctx);
+}
+
+/** callback to start a about fetch */
+static bool fetch_about_start(void *ctx)
+{
+	return true;
+}
+
+/** callback to abort a about fetch */
+static void fetch_about_abort(void *ctx)
+{
+	struct fetch_about_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 about fetch contents */
+static void fetch_about_poll(const char *scheme)
+{
+	struct fetch_about_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) {
+			/* about 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_about_register(void)
+{
+	fetch_add_fetcher("about",
+		fetch_about_initialise,
+		fetch_about_setup,
+		fetch_about_start,
+		fetch_about_abort,
+		fetch_about_free,
+		fetch_about_poll,
+		fetch_about_finalise);
+}
-- 
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