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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* raptor_www.c - Raptor WWW retrieval core
*
* $Id$
*
* Copyright (C) 2003-2004, David Beckett http://purl.org/net/dajobe/
* Institute for Learning and Research Technology http://www.ilrt.bristol.ac.uk/
* University of Bristol, UK http://www.bristol.ac.uk/
*
* This package is Free Software and part of Redland http://librdf.org/
*
* It is licensed under the following three licenses as alternatives:
* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
* 2. GNU General Public License (GPL) V2 or any newer version
* 3. Apache License, V2.0 or any newer version
*
* You may not use this file except in compliance with at least one of
* the above three licenses.
*
* See LICENSE.html or LICENSE.txt at the top of this package for the
* complete terms and further detail along with the license texts for
* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <raptor_config.h>
#endif
#ifdef WIN32
#include <win32_raptor_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
/* Raptor includes */
#include "raptor.h"
#include "raptor_internal.h"
static int raptor_www_file_fetch(raptor_www *www);
/* should raptor_www do initializing and cleanup of the WWW library */
static int raptor_www_do_www_init_finish=1;
#ifdef RAPTOR_WWW_LIBWWW
/* Non-zero only if Raptor initialised the W3C libwww library */
static int raptor_libwww_initialised=0;
#endif
void
raptor_www_init(void)
{
static int initialized=0;
if(initialized)
return;
if(raptor_www_do_www_init_finish) {
#ifdef RAPTOR_WWW_LIBCURL
curl_global_init(CURL_GLOBAL_ALL);
#endif
#ifdef RAPTOR_WWW_LIBWWW
if(!HTLib_isInitialized()) {
raptor_libwww_initialised=1;
HTLibInit(PACKAGE, VERSION);
}
#endif
}
initialized=1;
}
/**
* raptor_www_no_www_library_init_finish - Do not initialise or finish the lower level WWW library
*
* If this is called then the raptor_www library will neither
* initialise or terminate the lower level WWW library. Usually in
* raptor_init either curl_global_init (for libcurl) or HTLibInit
* (for w3c libwww) are called and in raptor_finish either
* curl_global_cleanup or HTLibTerminate are called.
*
* This allows the application finer control over these libraries such
* as setting other global options or potentially calling and terminating
* raptor several times. It does mean that applications which use
* this call must do their own extra work in order to allocate and free
* all resources to the system.
*
* This function must be called before raptor_init.
*
**/
void
raptor_www_no_www_library_init_finish(void)
{
raptor_www_do_www_init_finish=0;
}
void
raptor_www_finish(void)
{
if(raptor_www_do_www_init_finish) {
#ifdef RAPTOR_WWW_LIBCURL
curl_global_cleanup();
#endif
#ifdef RAPTOR_WWW_LIBWWW
if(raptor_libwww_initialised)
HTLibTerminate();
#endif
}
}
raptor_www *
raptor_www_new_with_connection(void *connection)
{
raptor_www *www=(raptor_www *)RAPTOR_CALLOC(www, 1, sizeof(raptor_www));
if(!www)
return NULL;
www->type=NULL;
www->free_type=1; /* default is to free content type */
www->total_bytes=0;
www->failed=0;
www->status_code=0;
www->write_bytes=NULL;
www->content_type=NULL;
#ifdef RAPTOR_WWW_LIBCURL
www->curl_handle=(CURL*)connection;
raptor_www_curl_init(www);
#endif
#ifdef RAPTOR_WWW_LIBXML
raptor_www_libxml_init(www);
#endif
#ifdef RAPTOR_WWW_LIBWWW
raptor_www_libwww_init(www);
#endif
#ifdef RAPTOR_WWW_LIBFETCH
raptor_www_libfetch_init(www);
#endif
return www;
}
raptor_www*
raptor_www_new(void)
{
return raptor_www_new_with_connection(NULL);
}
void
raptor_www_free(raptor_www *www)
{
/* free context */
if(www->type) {
if(www->free_type)
RAPTOR_FREE(cstring, www->type);
www->type=NULL;
}
if(www->user_agent) {
RAPTOR_FREE(cstring, www->user_agent);
www->user_agent=NULL;
}
if(www->proxy) {
RAPTOR_FREE(cstring, www->proxy);
www->proxy=NULL;
}
if(www->http_accept) {
RAPTOR_FREE(cstring, www->http_accept);
www->http_accept=NULL;
}
#ifdef RAPTOR_WWW_LIBCURL
raptor_www_curl_free(www);
#endif
#ifdef RAPTOR_WWW_LIBXML
raptor_www_libxml_free(www);
#endif
#ifdef RAPTOR_WWW_LIBWWW
raptor_www_libwww_free(www);
#endif
#ifdef RAPTOR_WWW_LIBFETCH
raptor_www_libfetch_free(www);
#endif
if(www->uri)
raptor_free_uri(www->uri);
RAPTOR_FREE(www, www);
}
void
raptor_www_set_error_handler(raptor_www *www,
raptor_message_handler error_handler,
void *error_data)
{
www->error_handler=error_handler;
www->error_data=error_data;
}
void
raptor_www_set_write_bytes_handler(raptor_www *www,
raptor_www_write_bytes_handler handler,
void *user_data)
{
www->write_bytes=handler;
www->write_bytes_userdata=user_data;
}
void
raptor_www_set_content_type_handler(raptor_www *www,
raptor_www_content_type_handler handler,
void *user_data)
{
www->content_type=handler;
www->content_type_userdata=user_data;
}
void
raptor_www_set_user_agent(raptor_www *www, const char *user_agent)
{
char *ua_copy=(char*)RAPTOR_MALLOC(cstring, strlen(user_agent)+1);
if(!ua_copy)
return;
strcpy(ua_copy, user_agent);
www->user_agent=ua_copy;
}
void
raptor_www_set_proxy(raptor_www *www, const char *proxy)
{
char *proxy_copy=(char*)RAPTOR_MALLOC(cstring, strlen(proxy)+1);
if(!proxy_copy)
return;
strcpy(proxy_copy, proxy);
www->proxy=proxy_copy;
}
/**
* raptor_www_set_http_accept - Set HTTP Accept header
* @www: &raptor_www class
* @value: Accept: header value or NULL to have an empty one.
*
**/
void
raptor_www_set_http_accept(raptor_www *www, const char *value)
{
char *value_copy;
size_t len=8; /* strlen("Accept:")+1 */
if(value)
len+=1+strlen(value); /* " "+value */
value_copy=(char*)RAPTOR_MALLOC(cstring, len);
if(!value_copy)
return;
www->http_accept=value_copy;
strcpy(value_copy, "Accept:");
value_copy+=7;
if(value) {
*value_copy++=' ';
strcpy(value_copy, value);
}
}
/**
* raptor_www_get_connection - Get internal WWW library connection object
* @www: &raptor_www object
*
* Return value: connection object or NULL
**/
void*
raptor_www_get_connection(raptor_www *www)
{
#ifdef RAPTOR_WWW_NONE
return NULL;
#endif
#ifdef RAPTOR_WWW_LIBCURL
return www->curl_handle;
#endif
#ifdef RAPTOR_WWW_LIBXML
return www->ctxt;
#endif
#ifdef RAPTOR_WWW_LIBWWW
return NULL;
#endif
#ifdef RAPTOR_WWW_LIBFETCH
return NULL;
#endif
return NULL;
}
void
raptor_www_abort(raptor_www *www, const char *reason) {
www->failed=1;
}
void
raptor_www_error_varargs(raptor_www *www, const char *message, va_list arguments)
{
if(www->error_handler) {
char *buffer=raptor_vsnprintf(message, arguments);
if(!buffer) {
fprintf(stderr, "raptor_www_error: Out of memory\n");
return;
}
www->error_handler(www->error_data, &www->locator, buffer);
RAPTOR_FREE(cstring, buffer);
} else {
raptor_print_locator(stderr, &www->locator);
fprintf(stderr, " raptor www error - ");
vfprintf(stderr, message, arguments);
fputc('\n', stderr);
}
}
void
raptor_www_error(raptor_www *www, const char *message, ...)
{
va_list arguments;
va_start(arguments, message);
raptor_www_error_varargs(www, message, arguments);
va_end(arguments);
}
static int
raptor_www_file_fetch(raptor_www *www)
{
char *filename;
FILE *fh;
unsigned char buffer[RAPTOR_WWW_BUFFER_SIZE];
unsigned char *uri_string=raptor_uri_as_string(www->uri);
#if defined(HAVE_UNISTD_H) && defined(HAVE_SYS_STAT_H)
struct stat buf;
#endif
filename=raptor_uri_uri_string_to_filename(uri_string);
if(!filename) {
raptor_www_error(www, "Not a file: URI");
return 1;
}
#if defined(HAVE_UNISTD_H) && defined(HAVE_SYS_STAT_H)
if(!stat(filename, &buf) && S_ISDIR(buf.st_mode)) {
raptor_www_error(www, "Cannot read from a directory '%s'", filename);
RAPTOR_FREE(cstring, filename);
www->status_code=404;
return 1;
}
#endif
fh=fopen(filename, "rb");
if(!fh) {
raptor_www_error(www, "file '%s' open failed - %s",
filename, strerror(errno));
RAPTOR_FREE(cstring, filename);
www->status_code=404;
return 1;
}
while(!feof(fh)) {
int len=fread(buffer, 1, RAPTOR_WWW_BUFFER_SIZE, fh);
www->total_bytes += len;
if(len > 0 && www->write_bytes)
www->write_bytes(www, www->write_bytes_userdata, buffer, len, 1);
if(feof(fh) || www->failed)
break;
}
fclose(fh);
RAPTOR_FREE(cstring, filename);
if(!www->failed)
www->status_code=200;
return www->failed;
}
int
raptor_www_fetch(raptor_www *www, raptor_uri *uri)
{
www->uri=raptor_new_uri_for_retrieval(uri);
www->locator.uri=uri;
www->locator.line= -1;
www->locator.column= -1;
#ifdef RAPTOR_WWW_NONE
return raptor_www_file_fetch(www);
#else
if(raptor_uri_is_file_uri(raptor_uri_as_string(www->uri)))
return raptor_www_file_fetch(www);
#ifdef RAPTOR_WWW_LIBCURL
return raptor_www_curl_fetch(www);
#endif
#ifdef RAPTOR_WWW_LIBXML
return raptor_www_libxml_fetch(www);
#endif
#ifdef RAPTOR_WWW_LIBWWW
return raptor_www_libwww_fetch(www);
#endif
#ifdef RAPTOR_WWW_LIBFETCH
return raptor_www_libfetch_fetch(www);
#endif
#endif
return 1; /* Default to failed */
}
|