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netsurf/content/fetchcache.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
*/
/** \file
* High-level fetching, caching and conversion (implementation).
*
* The implementation checks the cache for the requested URL. If it is not
* present, a content is created and a fetch is initiated. As the status of the
* fetch changes and data is received, the content is updated appropriately.
*/
#define _GNU_SOURCE /* for strndup */
#include <assert.h>
#include <string.h>
#include <sys/types.h>
#include <regex.h>
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/content/fetchcache.h"
#include "netsurf/content/fetch.h"
#include "netsurf/content/url_store.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/url.h"
#include "netsurf/utils/utils.h"
static char error_page[1000];
static regex_t re_content_type;
static void fetchcache_callback(fetch_msg msg, void *p, const char *data,
unsigned long size);
static char *fetchcache_parse_type(const char *s, char **params[]);
static void fetchcache_error_page(struct content *c, const char *error);
/**
* Retrieve a URL or prepare to fetch, convert, and cache it.
*
* The caller must supply a callback function which is called when anything
* interesting happens to the content which is returned. See content.h.
*
* \param url address to fetch
* \param callback function to call when anything interesting happens to
* the new content
* \param p1 user parameter for callback
* \param p2 user parameter for callback
* \param width available space
* \param height available space
* \param no_error_pages if an error occurs, send CONTENT_MSG_ERROR instead
* of generating an error page
* \param post_urlenc url encoded post data, or 0 if none
* \param post_multipart multipart post data, or 0 if none
* \param cookies send and accept cookies
* \param download download, rather than render content
* \return a new content, or 0 on memory exhaustion
*
* On success, call fetchcache_go() to start work on the new content.
*/
struct content * fetchcache(const char *url,
void (*callback)(content_msg msg, struct content *c, void *p1,
void *p2, union content_msg_data data),
void *p1, void *p2,
int width, int height,
bool no_error_pages,
char *post_urlenc,
struct form_successful_control *post_multipart,
bool cookies,
bool download)
{
struct content *c;
char *url1;
char *hash;
if ((url1 = strdup(url)) == NULL)
return NULL;
/* strip fragment identifier */
if ((hash = strchr(url1, '#')) != NULL)
*hash = 0;
LOG(("url %s", url1));
if (!post_urlenc && !post_multipart && !download) {
if ((c = content_get(url1)) != NULL) {
free(url1);
if (!content_add_user(c, callback, p1, p2))
return NULL;
else
return c;
}
}
c = content_create(url1);
free(url1);
if (!c)
return NULL;
if (!content_add_user(c, callback, p1, p2)) {
return NULL;
}
if (!post_urlenc && !post_multipart && !download)
c->fresh = true;
c->width = width;
c->height = height;
c->no_error_pages = no_error_pages;
c->download = download;
return c;
}
/**
* Start fetching and converting a content.
*
* \param content content to fetch, as returned by fetchcache()
* \param referer referring URL, or 0
* \param callback function to call when anything interesting happens to
* the new content
* \param p1 user parameter for callback
* \param p2 user parameter for callback
* \param width available space
* \param height available space
* \param post_urlenc url encoded post data, or 0 if none
* \param post_multipart multipart post data, or 0 if none
* \param cookies send and accept cookies
*
* Errors will be sent back through the callback.
*/
void fetchcache_go(struct content *content, char *referer,
void (*callback)(content_msg msg, struct content *c, void *p1,
void *p2, union content_msg_data data),
void *p1, void *p2,
int width, int height,
char *post_urlenc,
struct form_successful_control *post_multipart,
bool cookies)
{
char error_message[500];
union content_msg_data msg_data;
LOG(("url %s, status %s", content->url,
content_status_name[content->status]));
if (content->status == CONTENT_STATUS_TYPE_UNKNOWN && content->fetch) {
/* fetching, but not yet received any response:
* no action required */
} else if (content->status == CONTENT_STATUS_TYPE_UNKNOWN) {
/* brand new content: start fetch */
content->fetch = fetch_start(content->url, referer,
fetchcache_callback, content,
content->no_error_pages,
post_urlenc, post_multipart, cookies);
if (!content->fetch) {
LOG(("warning: fetch_start failed"));
snprintf(error_message, sizeof error_message,
messages_get("InvalidURL"),
content->url);
if (content->no_error_pages) {
content->status = CONTENT_STATUS_ERROR;
msg_data.error = error_message;
content_broadcast(content, CONTENT_MSG_ERROR,
msg_data);
} else {
fetchcache_error_page(content, error_message);
}
}
/* in these remaining cases, we have to 'catch up' with the content's
* status, ie. send the same messages as if the content was
* gradually getting to the current status from TYPE_UNKNOWN */
} else if (content->status == CONTENT_STATUS_LOADING) {
callback(CONTENT_MSG_LOADING, content, p1, p2, msg_data);
} else if (content->status == CONTENT_STATUS_READY) {
callback(CONTENT_MSG_LOADING, content, p1, p2, msg_data);
if (content_find_user(content, callback, p1, p2))
callback(CONTENT_MSG_READY, content, p1, p2, msg_data);
} else if (content->status == CONTENT_STATUS_DONE) {
callback(CONTENT_MSG_LOADING, content, p1, p2, msg_data);
if (content->available_width != width)
content_reformat(content, width, height);
if (content_find_user(content, callback, p1, p2))
callback(CONTENT_MSG_READY, content, p1, p2, msg_data);
if (content_find_user(content, callback, p1, p2))
callback(CONTENT_MSG_DONE, content, p1, p2, msg_data);
} else if (content->status == CONTENT_STATUS_ERROR) {
/* shouldn't usually occur */
msg_data.error = messages_get("MiscError");
callback(CONTENT_MSG_ERROR, content, p1, p2, msg_data);
}
}
/**
* Callback function for fetch.
*
* This is called when the status of a fetch changes.
*/
void fetchcache_callback(fetch_msg msg, void *p, const char *data,
unsigned long size)
{
struct url_content *url_content;
bool res;
struct content *c = p;
content_type type;
char *mime_type, *url;
char **params;
unsigned int i;
union content_msg_data msg_data;
url_func_result result;
switch (msg) {
case FETCH_TYPE:
c->total_size = size;
mime_type = fetchcache_parse_type(data, &params);
if (!mime_type) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR,
msg_data);
fetch_abort(c->fetch);
c->fetch = 0;
return;
}
type = content_lookup(mime_type);
LOG(("FETCH_TYPE, type %u", c->download ?
CONTENT_OTHER : type));
res = content_set_type(c,
c->download ? CONTENT_OTHER : type,
mime_type, params);
free(mime_type);
for (i = 0; params[i]; i++)
free(params[i]);
free(params);
if (!res) {
fetch_abort(c->fetch);
c->fetch = 0;
}
break;
case FETCH_PROGRESS:
if (size)
content_set_status(c,
messages_get("RecPercent"),
data, (unsigned int)size);
else
content_set_status(c,
messages_get("Received"),
data);
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
break;
case FETCH_DATA:
LOG(("FETCH_DATA"));
/* if (c->total_size)
content_set_status(c,
messages_get("RecPercent"),
human_friendly_bytesize(c->source_size + size),
human_friendly_bytesize(c->total_size),
(unsigned int) ((c->source_size + size) * 100 / c->total_size));
else
content_set_status(c,
messages_get("Received"),
human_friendly_bytesize(c->source_size + size));
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
*/ if (!content_process_data(c, data, size)) {
fetch_abort(c->fetch);
c->fetch = 0;
}
break;
case FETCH_FINISHED:
url_content = url_store_find(c->url);
if (url_content)
url_content->requests++;
LOG(("FETCH_FINISHED"));
c->fetch = 0;
content_set_status(c, messages_get("Converting"),
c->source_size);
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
content_convert(c, c->width, c->height);
break;
case FETCH_ERROR:
LOG(("FETCH_ERROR, '%s'", data));
c->fetch = 0;
if (c->no_error_pages) {
c->status = CONTENT_STATUS_ERROR;
msg_data.error = data;
content_broadcast(c, CONTENT_MSG_ERROR,
msg_data);
} else {
content_reset(c);
fetchcache_error_page(c, data);
}
break;
case FETCH_REDIRECT:
LOG(("FETCH_REDIRECT, '%s'", data));
c->fetch = 0;
/* redirect URLs must be absolute by HTTP/1.1, but many sites send
* relative ones: treat them as relative to requested URL */
result = url_join(data, c->url, &url);
if (result == URL_FUNC_OK) {
msg_data.redirect = url;
content_broadcast(c, CONTENT_MSG_REDIRECT, msg_data);
free(url);
} else {
msg_data.error = messages_get("BadRedirect");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
}
/* set the status to ERROR so that the content is
* destroyed in content_clean() */
c->status = CONTENT_STATUS_ERROR;
break;
#ifdef WITH_AUTH
case FETCH_AUTH:
/* data -> string containing the Realm */
LOG(("FETCH_AUTH, '%s'", data));
c->fetch = 0;
msg_data.auth_realm = data;
content_broadcast(c, CONTENT_MSG_AUTH, msg_data);
/* set the status to ERROR so that the content is
* destroyed in content_clean() */
c->status = CONTENT_STATUS_ERROR;
break;
#endif
default:
assert(0);
}
}
/**
* Initialise the fetchcache module.
*/
void fetchcache_init(void)
{
regcomp_wrapper(&re_content_type,
"^([-0-9a-zA-Z_.]+/[-0-9a-zA-Z_.]+)[ \t]*"
"(;[ \t]*([-0-9a-zA-Z_.]+)="
"([-0-9a-zA-Z_.]+|\"([^\"]|[\\].)*\")[ \t]*)*$",
REG_EXTENDED);
}
/**
* Parse a Content-Type header.
*
* \param s a Content-Type header
* \param params updated to point to an array of strings, ordered attribute,
* value, attribute, ..., 0
* \return a new string containing the MIME-type, or 0 on memory exhaustion
*/
#define MAX_ATTRS 10
char *fetchcache_parse_type(const char *s, char **params[])
{
char *type = 0;
unsigned int i;
int r;
regmatch_t pmatch[2 + MAX_ATTRS * 3];
*params = malloc((MAX_ATTRS * 2 + 2) * sizeof (*params)[0]);
if (!*params)
goto no_memory;
for (i = 0; i != MAX_ATTRS * 2 + 2; i++)
(*params)[i] = 0;
r = regexec(&re_content_type, s, 2 + MAX_ATTRS * 3, pmatch, 0);
if (r) {
LOG(("failed to parse content-type '%s'", s));
type = strdup(s);
if (!type)
goto no_memory;
return type;
}
type = strndup(s + pmatch[1].rm_so, pmatch[1].rm_eo - pmatch[1].rm_so);
if (!type) {
free(*params);
return 0;
}
/* parameters */
for (i = 0; i != MAX_ATTRS && pmatch[2 + 3 * i].rm_so != -1; i++) {
(*params)[2 * i] = strndup(s + pmatch[2 + 3 * i + 1].rm_so,
pmatch[2 + 3 * i + 1].rm_eo -
pmatch[2 + 3 * i + 1].rm_so);
(*params)[2 * i + 1] = strndup(s + pmatch[2 + 3 * i + 2].rm_so,
pmatch[2 + 3 * i + 2].rm_eo -
pmatch[2 + 3 * i + 2].rm_so);
if (!(*params)[2 * i] || !(*params)[2 * i + 1])
goto no_memory;
}
(*params)[2 * i] = 0;
return type;
no_memory:
for (i = 0; i != MAX_ATTRS * 2 + 2; i++)
free((*params)[i]);
free(*params);
free(type);
return 0;
}
/**
* Generate an error page.
*
* \param c empty content to generate the page in
* \param error message to display
*/
void fetchcache_error_page(struct content *c, const char *error)
{
const char *params[] = { 0 };
int length;
if ((length = snprintf(error_page, sizeof(error_page),
messages_get("ErrorPage"), error)) < 0)
length = 0;
if (!content_set_type(c, CONTENT_HTML, "text/html", params))
return;
if (!content_process_data(c, error_page, length))
return;
content_convert(c, c->width, c->height);
}
#ifdef TEST
#include <unistd.h>
void callback(fetchcache_msg msg, struct content *c, void *p, char *error)
{
switch (msg) {
case FETCHCACHE_OK:
LOG(("FETCHCACHE_OK, url '%s'", p));
break;
case FETCHCACHE_BADTYPE:
LOG(("FETCHCACHE_BADTYPE, url '%s'", p));
break;
case FETCHCACHE_ERROR:
LOG(("FETCHCACHE_ERROR, url '%s', error '%s'", p, error));
break;
default:
assert(0);
}
}
char *test[] = {"http://www.google.co.uk/", "http://www.ox.ac.uk/", "blah://blah/"};
int main(void)
{
int i;
cache_init();
fetch_init();
for (i = 0; i != sizeof(test) / sizeof(test[0]); i++)
fetchcache(test[i], 0, callback, test[i], 800, 0);
for (i = 0; i != 5; i++) {
fetch_poll();
sleep(1);
}
for (i = 0; i != sizeof(test) / sizeof(test[0]); i++)
fetchcache(test[i], 0, callback, test[i], 800, 0);
for (i = 0; i != 20; i++) {
fetch_poll();
sleep(1);
}
return 0;
}
#endif
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