/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* e-url.c
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 * This library is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This library 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Jon Trowbridge <trow@ximian.com>
 *          Rodrigo Moya <rodrigo@ximian.com>
 */

#include <config.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "e-url.h"

/**
 * e_url_shroud:
 * @url: The url to shroud.
 *
 * Removes the moniker (i.e. mailto:) from a url.
 *
 * Returns: The newly-allocated shrouded url.
 **/
gchar *
e_url_shroud (const gchar *url)
{
	const gchar *first_colon = NULL;
	const gchar *last_at = NULL;
	const gchar *p;
	gchar *shrouded;

	if (url == NULL)
		return NULL;

	/* Skip past the moniker */
	for (p = url; *p && *p != ':'; ++p);
	if (*p)
		++p;

	while (*p) {
		if (first_colon == NULL && *p == ':')
			first_colon = p;
		if (*p == '@')
			last_at = p;
		++p;
	}

	if (first_colon && last_at && first_colon < last_at) {
		shrouded = g_malloc (first_colon - url + strlen (last_at) + 1);
		memcpy (shrouded, url, first_colon - url);
		strcpy (shrouded + (first_colon - url), last_at);
	} else {
		shrouded = g_strdup (url);
	}

	return shrouded;
}

/**
 * e_url_equal:
 * @url1: The first url to compare.
 * @url2: The second url to compare.
 *
 * Checks two urls for equality, after first removing any monikers on
 * the urls.
 *
 * Returns: %TRUE if the urls are equal, %FALSE if they are not.
 **/
gboolean
e_url_equal (const gchar *url1,
             const gchar *url2)
{
	gchar *shroud1 = e_url_shroud (url1);
	gchar *shroud2 = e_url_shroud (url2);
	gint len1, len2;
	gboolean rv;

	if (shroud1 == NULL || shroud2 == NULL) {
		rv = (shroud1 == shroud2);
	} else {
		len1 = strlen (shroud1);
		len2 = strlen (shroud2);

		rv = !strncmp (shroud1, shroud2, MIN (len1, len2));
	}

	g_free (shroud1);
	g_free (shroud2);

	return rv;
}

#define HEXVAL(c) (isdigit (c) ? (c) - '0' : tolower (c) - 'a' + 10)

static void
uri_decode (gchar *part)
{
	guchar *s, *d;

	s = d = (guchar *) part;
	while (*s) {
		if (*s == '%') {
			if (isxdigit (s[1]) && isxdigit (s[2])) {
				*d++ = HEXVAL (s[1]) * 16 + HEXVAL (s[2]);
				s += 3;
			} else
				*d++ = *s++;
		} else
			*d++ = *s++;
	}
	*d = '\0';
}

/**
 * e_uri_new:
 * @uri_string: The uri to represent as an #EUri.
 *
 * Creates an #EUri representation of the uri given in @uri_string.
 *
 * Returns: The newly-allocated #EUri structure.
 **/
EUri *
e_uri_new (const gchar *uri_string)
{
	EUri *uri;
	const gchar *end, *hash, *colon, *semi, *at, *slash, *question;
	const gchar *p;

	if (!uri_string)
		return NULL;

	uri = g_new0 (EUri, 1);

	/* find fragment */
	end = hash = strchr (uri_string, '#');
	if (hash && hash[1]) {
		uri->fragment = g_strdup (hash + 1);
		uri_decode (uri->fragment);
	}
	else
		end = uri_string + strlen (uri_string);

	/* find protocol: initial [a-z+.-]* substring until ":" */
	p = uri_string;
	while (p < end && (isalnum ((guchar) *p) ||
			   *p == '.' || *p == '+' || *p == '-'))
		p++;

	if (p > uri_string && *p == ':') {
		uri->protocol = g_ascii_strdown (uri_string, p - uri_string);
		uri_string = p + 1;
	}
	else
		uri->protocol = g_strdup ("file");

	if (!*uri_string)
		return uri;

	/* check for authority */
	if (strncmp (uri_string, "//", 2) == 0) {
		uri_string += 2;

		slash = uri_string + strcspn (uri_string, "/#");
		at = strchr (uri_string, '@');
		if (at && at < slash) {
			const gchar *at2;
			/* this is for cases where username contains '@' at it, like:
			 * http://user@domain.com@server.addr.com/path
			 * We skip all at-s before the slash here. */

			while (at2 = strchr (at + 1, '@'), at2 && at2 < slash) {
				at = at2;
			}
		}
		if (at && at < slash) {
			colon = strchr (uri_string, ':');
			if (colon && colon < at) {
				uri->passwd = g_strndup (colon + 1, at - colon - 1);
				uri_decode (uri->passwd);
			}
			else {
				uri->passwd = NULL;
				colon = at;
			}

			semi = strchr (uri_string, ';');
			if (semi && semi < colon &&
			    !g_ascii_strncasecmp (semi, ";auth=", 6)) {
				uri->authmech = g_strndup (semi + 6, colon - semi - 6);
				uri_decode (uri->authmech);
			}
			else {
				uri->authmech = NULL;
				semi = colon;
			}

			uri->user = g_strndup (uri_string, semi - uri_string);
			uri_decode (uri->user);
			uri_string = at + 1;
		}
		else
			uri->user = uri->passwd = uri->authmech = NULL;

		/* find host and port */
		colon = strchr (uri_string, ':');
		if (colon && colon < slash) {
			uri->host = g_strndup (uri_string, colon - uri_string);
			uri->port = strtoul (colon + 1, NULL, 10);
		}
		else {
			uri->host = g_strndup (uri_string, slash - uri_string);
			uri_decode (uri->host);
			uri->port = 0;
		}

		uri_string = slash;
	}

	/* find query */
	question = memchr (uri_string, '?', end - uri_string);
	if (question) {
		if (question[1]) {
			uri->query = g_strndup (question + 1, end - (question + 1));
			uri_decode (uri->query);
		}
		end = question;
	}

	/* find parameters */
	semi = memchr (uri_string, ';', end - uri_string);
	if (semi) {
		if (semi[1]) {
			const gchar *cur, *ptr, *eq;
			gchar *name, *value;

			for (cur = semi + 1; cur < end; cur = ptr + 1) {
				ptr = memchr (cur, ';', end - cur);
				if (!ptr)
					ptr = end;
				eq = memchr (cur, '=', ptr - cur);
				if (eq) {
					name = g_strndup (cur, eq - cur);
					value = g_strndup (eq + 1, ptr - (eq + 1));
					uri_decode (value);
				} else {
					name = g_strndup (cur, ptr - cur);
					value = g_strdup ("");
				}
				uri_decode (name);
				g_datalist_set_data_full (
					&uri->params, name,
					value, g_free);
				g_free (name);
			}
		}
		end = semi;
	}

	if (end != uri_string) {
		uri->path = g_strndup (uri_string, end - uri_string);
		uri_decode (uri->path);
	}

	return uri;
}

/**
 * e_uri_free:
 * @uri: A pointer to the #EUri to free.
 *
 * Frees the memory of an #EUri structure.
 **/
void
e_uri_free (EUri *uri)
{
	if (uri) {
		g_free (uri->protocol);
		g_free (uri->user);
		g_free (uri->authmech);
		g_free (uri->passwd);
		g_free (uri->host);
		g_free (uri->path);
		g_datalist_clear (&uri->params);
		g_free (uri->query);
		g_free (uri->fragment);

		g_free (uri);
	}
}

/**
 * e_uri_get_param:
 * @uri: The #EUri to get the parameter from.
 * @name: The name of the parameter to get.
 *
 * Retrieves the value of the parameter associated with @name in @uri.
 *
 * Returns: The value of the parameter.
 **/
const gchar *
e_uri_get_param (EUri *uri,
                 const gchar *name)
{
	return g_datalist_get_data (&uri->params, name);
}

static void
copy_param_cb (GQuark key_id,
               gpointer data,
               gpointer user_data)
{
	GData *params = (GData *) user_data;

	g_datalist_id_set_data_full (&params, key_id, g_strdup (data), g_free);
}

/**
 * e_uri_copy:
 * @uri: The #EUri to copy.
 *
 * Makes a copy of @uri.
 *
 * Returns: The newly-allocated copy of @uri.
 **/
EUri *
e_uri_copy (EUri *uri)
{
	EUri *uri_copy;

	g_return_val_if_fail (uri != NULL, NULL);

	uri_copy = g_new0 (EUri, 1);
	uri_copy->protocol = g_strdup (uri->protocol);
	uri_copy->user = g_strdup (uri->user);
	uri_copy->authmech = g_strdup (uri->authmech);
	uri_copy->passwd = g_strdup (uri->passwd);
	uri_copy->host = g_strdup (uri->host);
	uri_copy->port = uri->port;
	uri_copy->path = g_strdup (uri->path);
	uri_copy->query = g_strdup (uri->query);
	uri_copy->fragment = g_strdup (uri->fragment);

	/* copy uri->params */
	g_datalist_foreach (&uri->params,
			    (GDataForeachFunc) copy_param_cb,
			    &uri_copy->params);

	return uri_copy;
}

/**
 * e_uri_to_string:
 * @uri: The #EUri to convert to a string.
 * @show_password: Whether or not to show the password in the string.
 *
 * Creates a string representation of @uri. The password will only be
 * included in the string if @show_password is set to %TRUE.
 *
 * Returns: The string representation of @uri.
 **/
gchar *
e_uri_to_string (EUri *uri,
                 gboolean show_password)
{
	gchar *str_uri = NULL;

	g_return_val_if_fail (uri != NULL, NULL);

	if (uri->port != 0)
		str_uri = g_strdup_printf (
			"%s://%s%s%s%s%s%s%s:%d%s%s%s",
			uri->protocol,
			uri->user ? uri->user : "",
			uri->authmech ? ";auth=" : "",
			uri->authmech ? uri->authmech : "",
			uri->passwd && show_password ? ":" : "",
			uri->passwd && show_password ? uri->passwd : "",
			uri->user ? "@" : "",
			uri->host ? uri->host : "",
			uri->port,
			uri->path ? uri->path : "",
			uri->query ? "?" : "",
			uri->query ? uri->query : "");
	else
		str_uri = g_strdup_printf (
			"%s://%s%s%s%s%s%s%s%s%s%s",
			uri->protocol,
			uri->user ? uri->user : "",
			uri->authmech ? ";auth=" : "",
			uri->authmech ? uri->authmech : "",
			uri->passwd && show_password ? ":" : "",
			uri->passwd && show_password ? uri->passwd : "",
			uri->user ? "@" : "",
			uri->host ? uri->host : "",
			uri->path ? uri->path : "",
			uri->query ? "?" : "",
			uri->query ? uri->query : "");

	return str_uri;
}
