mod_actions.c

apache简化版

/* ====================================================================
 * Copyright (c) 1995-1998 The Apache Group.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Group and was originally based
 * on public domain software written at the National Center for
 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
 * For more information on the Apache Group and the Apache HTTP server
 * project, please see <http://www.apache.org/>.
 *
 */

/*
 * mod_actions.c: executes scripts based on MIME type
 *
 * by Alexei Kosut; based on mod_cgi.c, mod_mime.c and mod_includes.c,
 * adapted by rst from original NCSA code by Rob McCool
 *
 * Usage instructions:
 *
 * Action mime/type /cgi-bin/script
 * 
 * will activate /cgi-bin/script when a file of content type mime/type is 
 * requested. It sends the URL and file path of the requested document using 
 * the standard CGI PATH_INFO and PATH_TRANSLATED environment variables.
 *
 */

#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_main.h"
#include "http_log.h"
#include "util_script.h"

typedef struct {
    table *action_types;	/* Added with Action... */
    char *get;			/* Added with Script GET */
    char *post;			/* Added with Script POST */
    char *put;			/* Added with Script PUT */
    char *delete;		/* Added with Script DELETE */
} action_dir_config;

module action_module;

static void *create_action_dir_config(pool *p, char *dummy)
{
    action_dir_config *new =
    (action_dir_config *) ap_palloc(p, sizeof(action_dir_config));

    new->action_types = ap_make_table(p, 4);
    new->get = NULL;
    new->post = NULL;
    new->put = NULL;
    new->delete = NULL;

    return new;
}

static void *merge_action_dir_configs(pool *p, void *basev, void *addv)
{
    action_dir_config *base = (action_dir_config *) basev;
    action_dir_config *add = (action_dir_config *) addv;
    action_dir_config *new =
    (action_dir_config *) ap_palloc(p, sizeof(action_dir_config));

    new->action_types = ap_overlay_tables(p, add->action_types,
				       base->action_types);

    new->get = add->get ? add->get : base->get;
    new->post = add->post ? add->post : base->post;
    new->put = add->put ? add->put : base->put;
    new->delete = add->delete ? add->delete : base->delete;

    return new;
}

static const char *add_action(cmd_parms *cmd, action_dir_config * m, char *type,
			      char *script)
{
    ap_table_setn(m->action_types, type, script);
    return NULL;
}

static const char *set_script(cmd_parms *cmd, action_dir_config * m, char *method,
			      char *script)
{
    if (!strcmp(method, "GET"))
	m->get = script;
    else if (!strcmp(method, "POST"))
	m->post = script;
    else if (!strcmp(method, "PUT"))
	m->put = script;
    else if (!strcmp(method, "DELETE"))
	m->delete = script;
    else
	return "Unknown method type for Script";

    return NULL;
}

static const command_rec action_cmds[] =
{
    {"Action", add_action, NULL, OR_FILEINFO, TAKE2,
     "a media type followed by a script name"},
    {"Script", set_script, NULL, ACCESS_CONF | RSRC_CONF, TAKE2,
     "a method followed by a script name"},
    {NULL}
};

static int action_handler(request_rec *r)
{
    action_dir_config *conf =
    (action_dir_config *) ap_get_module_config(r->per_dir_config, &action_module);
    const char *t, *action = r->handler ? r->handler : r->content_type;
    const char *script = NULL;

    /* Set allowed stuff */
    if (conf->get)
	r->allowed |= (1 << M_GET);
    if (conf->post)
	r->allowed |= (1 << M_POST);
    if (conf->put)
	r->allowed |= (1 << M_PUT);
    if (conf->delete)
	r->allowed |= (1 << M_DELETE);

    /* First, check for the method-handling scripts */
    if ((r->method_number == M_GET) && r->args && conf->get)
	script = conf->get;
    else if ((r->method_number == M_POST) && conf->post)
	script = conf->post;
    else if ((r->method_number == M_PUT) && conf->put)
	script = conf->put;
    else if ((r->method_number == M_DELETE) && conf->delete)
	script = conf->delete;

    /* Check for looping, which can happen if the CGI script isn't */
    if (script && r->prev && r->prev->prev)
	return DECLINED;

    /* Second, check for actions (which override the method scripts) */
    if ((t = ap_table_get(conf->action_types,
		       action ? action : ap_default_type(r)))) {
	script = t;
	if (r->finfo.st_mode == 0) {
	    ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			"File does not exist: %s", r->filename);
	    return NOT_FOUND;
	}
    }

    if (script == NULL)
	return DECLINED;

    ap_internal_redirect_handler(ap_pstrcat(r->pool, script, escape_uri(r->pool,
			  r->uri), r->args ? "?" : NULL, r->args, NULL), r);
    return OK;
}

static const handler_rec action_handlers[] =
{
    {"*/*", action_handler},
    {NULL}
};

module action_module =
{
    STANDARD_MODULE_STUFF,
    NULL,			/* initializer */
    create_action_dir_config,	/* dir config creater */
    merge_action_dir_configs,	/* dir merger --- default is to override */
    NULL,			/* server config */
    NULL,			/* merge server config */
    action_cmds,		/* command table */
    action_handlers,		/* handlers */
    NULL,			/* filename translation */
    NULL,			/* check_user_id */
    NULL,			/* check auth */
    NULL,			/* check access */
    NULL,			/* type_checker */
    NULL,			/* fixups */
    NULL,			/* logger */
    NULL,			/* header parser */
    NULL,			/* child_init */
    NULL,			/* child_exit */
    NULL			/* post read-request */
};