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/*
This file is part of TALER
Copyright (C) 2019-2020 Taler Systems SA
TALER 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 3, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file payto.c
* @brief Common utility functions for dealing with payto://-URIs
* @author Florian Dold
*/
#include "platform.h"
#include "taler_util.h"
/**
* Prefix of PAYTO URLs.
*/
#define PAYTO "payto://"
/**
* Extract the subject value from the URI parameters.
*
* @param payto_uri the URL to parse
* @return NULL if the subject parameter is not found.
* The caller should free the returned value.
*/
char *
TALER_payto_get_subject (const char *payto_uri)
{
const char *key;
const char *value_start;
const char *value_end;
key = strchr (payto_uri,
(unsigned char) '?');
if (NULL == key)
return NULL;
do {
if (0 == strncasecmp (++key,
"subject",
strlen ("subject")))
{
value_start = strchr (key,
(unsigned char) '=');
if (NULL == value_start)
return NULL;
value_end = strchrnul (value_start,
(unsigned char) '&');
return GNUNET_strndup (value_start + 1,
value_end - value_start - 1);
}
} while ( (key = strchr (key,
(unsigned char) '&')) );
return NULL;
}
/**
* Obtain the payment method from a @a payto_uri. The
* format of a payto URI is 'payto://$METHOD/$SOMETHING'.
* We return $METHOD.
*
* @param payto_uri the URL to parse
* @return NULL on error (malformed @a payto_uri)
*/
char *
TALER_payto_get_method (const char *payto_uri)
{
const char *start;
const char *end;
if (0 != strncasecmp (payto_uri,
PAYTO,
strlen (PAYTO)))
return NULL;
start = &payto_uri[strlen (PAYTO)];
end = strchr (start,
(unsigned char) '/');
if (NULL == end)
return NULL;
return GNUNET_strndup (start,
end - start);
}
/**
* Obtain the account name from a payto URL. The format
* of the @a payto URL is 'payto://x-taler-bank/$HOSTNAME/$ACCOUNT[?PARAMS]'.
* We check the first part matches, skip over the $HOSTNAME
* and return the $ACCOUNT portion.
*
* @param payto an x-taler-bank payto URL
* @return only the account name from the @a payto URL, NULL if not an x-taler-bank
* payto URL
*/
char *
TALER_xtalerbank_account_from_payto (const char *payto)
{
const char *beg;
const char *end;
if (0 != strncasecmp (payto,
PAYTO "x-taler-bank/",
strlen (PAYTO "x-taler-bank/")))
return NULL;
beg = strchr (&payto[strlen (PAYTO "x-taler-bank/")],
'/');
if (NULL == beg)
return NULL;
beg++; /* now points to $ACCOUNT */
end = strchr (beg,
'?');
if (NULL == end)
return GNUNET_strdup (beg); /* optional part is missing */
return GNUNET_strndup (beg,
end - beg);
}
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