path: root/camel/url-util.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* url-util.c : utility functions to parse URLs */


/* 
 * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr>
 *
 * This program 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; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */



/* 
   Here we deal with URL following the general scheme:
   protocol://user:password@host:port/name
   where name is a path-like string (ie dir1/dir2/....)
   See rfc1738 for the complete description of 
   Uniform Ressource Locators 
   
     Bertrand. */
/*
  XXX TODO: recover  the words between #'s or ?'s after the path */


#include "url-util.h"

/* general item finder */
/* it begins the search at position @position in @url,
   returns true when the item is found, amd set position after the item */
typedef gboolean find_item_func(GString *url, GString **item, guint *position, gboolean *error);

/* used to find one item (protocol, then user .... */
typedef struct {
    char *item_name;           /* item name : for debug only */
    GString **item_value;      /* where the item value will go */
    find_item_func *find_func; /* item finder */
} FindStepStruct;

static gboolean find_protocol(GString *url, GString **item, guint *position, gboolean *error);
static gboolean find_user(GString *url, GString **item, guint *position, gboolean *error);
static gboolean find_passwd(GString *url, GString **item, guint *position, gboolean *error);
static gboolean find_host(GString *url, GString **item, guint *position, gboolean *error);
static gboolean find_port(GString *url, GString **item, guint *position, gboolean *error);
static gboolean find_path(GString *url, GString **item, guint *position, gboolean *error);



/**
 * new_g_url: create an Gurl object from a string
 * @url_string: The string containing the URL to scan
 * 
 * This routine takes a GString and parses it as an
 * URL of the form:
 * protocol://user:password@host:port/path
 * there is no test on the values. For example,
 * "port" can be a string, not only a number !
 * The Gurl structure fields ar filled with
 * the scan results. When a member of the 
 * general URL can not be found, the corresponding
 * Gurl member is NULL  
 * 
 * Return value: a Gurl structure containng the URL items.
 **/
Gurl *g_url_new(GString* url_string)
{
    Gurl *g_url;
    
    GString *protocol;
    GString *user;
    GString *passwd;
    GString *host;
    GString *port;
    GString *path;
    
    guint position=0;
    gboolean error;
    gboolean found;
    guint i;
    
    g_url = g_new(Gurl,1);

#define NB_STEP_URL  6
    {
        FindStepStruct step[NB_STEP_URL] = {
            { "protocol", &(g_url->protocol), find_protocol},
            { "user", &(g_url->user), find_user},
            { "password", &(g_url->passwd), find_passwd},
            { "host", &(g_url->host), find_host},
            { "port", &(g_url->port), find_port},
            { "path", &(g_url->path), find_path}
        };
        
        for (i=0; i<NB_STEP_URL; i++) {
            found = step[i].find_func(url_string, 
                          step[i].item_value, 
                          &position, 
                          &error);
        }
    }
    
    return g_url;
}





/** So, yes, I must admit there would have been more elegant
    ways to do this, but it works, and quite well :)  */


static gboolean 
find_protocol(GString *url, GString **item, guint *position, gboolean *error)
{

    guint i;
    gchar *str_url;
    gint len_url;
    gchar *str_protocol;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    *error = FALSE;
    i=*position;
    
    /* find a ':' */
    while ( (i<len_url) && (str_url[i] != ':') ) i++;
    
    if (i==len_url) return FALSE;
    i++;

    /* check if it is followed by a "//" */
    if  ((i<len_url) && (str_url[i++] == '/'))
        if ((i<len_url) && (str_url[i++] == '/'))
        {
            
            str_protocol = g_strndup(str_url, i-3);
            *item = g_string_new(str_protocol);
            *position=i;
            return TRUE;
        }
    
    return FALSE;
}




static gboolean
find_user(GString *url, GString **item, guint *position, gboolean *error)
{
    guint i;
    guint at_pos;
    
    gchar *str_url;
    gint len_url;
    gchar *str_user;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    i=*position;
    

    /* find a '@' */
    while ((i<len_url) && (str_url[i] != '@')) i++;
    
    if (i==len_url) return FALSE;
    at_pos = i;
    i = *position;

    /* find a ':' */
    while ( (i<at_pos) && (str_url[i] != ':') ) i++;

    /* now if i has not been incremented at all, there is no user */
    if (i == *position) {
        (*position)++;
        return FALSE;
    }
    
    str_user = g_strndup(str_url+ *position, i - *position);
    *item = g_string_new(str_user);
    if (i<at_pos) *position=i+1; /* there was a ':', skip it */
    else *position=i;
    
    return TRUE;    
}

static gboolean
find_passwd(GString *url, GString **item, guint *position, gboolean *error)
{
    guint i;
    
    gchar *str_url;
    gint len_url;
    gchar *str_passwd;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    i=*position;
    

    /* find a '@' */
    while ((i<len_url) && (str_url[i] != '@')) i++;
    
    if (i==len_url) return FALSE;
    /*i has not been incremented at all, there is no passwd */
    if (i == *position) {
        *position = i+1;
        return FALSE;
    }
    
    str_passwd = g_strndup(str_url+ *position, i - *position);
    *item = g_string_new(str_passwd);
    *position=i+1; /* skip it the '@' */
    
    return TRUE;
}



static gboolean
find_host(GString *url, GString **item, guint *position, gboolean *error)
{
    guint i;
    guint slash_pos;
    
    gchar *str_url;
    gint len_url;
    gchar *str_host;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    i=*position;
    

    /* find a '/' */
    while ((i<len_url) && (str_url[i] != '/')) i++;
    
    slash_pos = i;
    i = *position;

    /* find a ':' */
    while ( (i<slash_pos) && (str_url[i] != ':') ) i++;

    /* at this point if i has not been incremented at all, 
       there is no host */
    if (i == *position) {
        (*position)++;
        return FALSE;
    }
    
    str_host = g_strndup(str_url+ *position, i - *position);
    *item = g_string_new(str_host);
    if (i<slash_pos) *position=i+1; /* there was a ':', skip it */
    else *position=i;
    
    return TRUE;
}


static gboolean
find_port(GString *url, GString **item, guint *position, gboolean *error)
{
    guint i;
    guint slash_pos;
    
    gchar *str_url;
    gint len_url;
    gchar *str_port;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    i=*position;
    

    /* find a '/' */
    while ((i<len_url) && (str_url[i] != '/')) i++;
    
    slash_pos = i;
    i = *position;

    /* find a ':' */
    while ( (i<slash_pos) && (str_url[i] != ':') ) i++;

    /* at this point if i has not been incremented at all, 
       there is no port */
    if (i == *position) return FALSE;

    str_port = g_strndup(str_url+ *position, i - *position);
    *item = g_string_new(str_port);
    *position = i;
    return TRUE;
}


static gboolean
find_path(GString *url, GString **item, guint *position, gboolean *error)
{
    guint i;
    
    gchar *str_url;
    gint len_url;
    gchar *str_path;
    
    str_url = url->str;
    len_url = url->len;
    
    *item = NULL;
    i=*position;
    

    /* find a '#' */
    while ((i<len_url) && (str_url[i] != '#') && (str_url[i] != '?')) i++;
    
    /*i has not been incremented at all, there is no path */
    if (i == *position) return FALSE;
    
    str_path = g_strndup(str_url+ *position, i - *position);
    *item = g_string_new(str_path);
    *position=i;
    
    
    return TRUE;
}


/* to tests this file :
   gcc -o test_url_util `glib-config --cflags`  -DTEST_URL_UTIL url-util.c `glib-config --libs`
   ./test_url_util URL
*/
#ifdef TEST_URL_UTIL



int 
main (int argc, char **argv)
{

    GString *url;
    GString *protocol;
    GString *user;
    GString *passwd;
    GString *host;
    GString *port;
    GString *path;
    guint position=0;
    gboolean error;
    gboolean found;
    guint i;
    guint i_pos;

#define NB_STEP_TEST  6
    FindStepStruct test_step[NB_STEP_TEST] = {
        { "protocol", &protocol, find_protocol},
        { "user", &user, find_user},
        { "password", &passwd, find_passwd},
        { "host", &host, find_host},
        { "port", &port, find_port},
        { "path", &path, find_path}
    };
    url = g_string_new(argv[1]);
    printf("URL to test : %s\n\n", url->str);
    for (i=0; i<NB_STEP_TEST; i++) {
        found = test_step[i].find_func(url, 
                      test_step[i].item_value, 
                      &position, 
                      &error);
        if (found) {
            printf("\t\t\t\t** %s found : %s\n",
                   test_step[i].item_name,
                   (*test_step[i].item_value)->str);
        } else printf("** %s not found in URL\n", test_step[i].item_name);
        printf("next item position:\n");
        printf("%s\n", url->str);
        for(i_pos=0; i_pos<position; i_pos++) printf(" ");
        printf("^\n");
        
    }
    
}

#endif /* TEST_URL_UTIL */