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-rw-r--r--src/exchange/taler-exchange-httpd_csr.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_csr.c b/src/exchange/taler-exchange-httpd_csr.c
new file mode 100644
index 000000000..0e330fe30
--- /dev/null
+++ b/src/exchange/taler-exchange-httpd_csr.c
@@ -0,0 +1,178 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2021 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General
+ Public License along with TALER; see the file COPYING. If not,
+ see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-exchange-httpd_csr.c
+ * @brief Handle /csr requests
+ * @author Lucien Heuzeveldt
+ * @author Gian Demarmles
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <jansson.h>
+#include "taler_json_lib.h"
+#include "taler_mhd_lib.h"
+#include "taler-exchange-httpd_csr.h"
+#include "taler-exchange-httpd_responses.h"
+#include "taler-exchange-httpd_keys.h"
+
+
+MHD_RESULT
+TEH_handler_csr (struct TEH_RequestContext *rc,
+ const json_t *root,
+ const char *const args[])
+{
+ // TODO: should we have something similar to struct WithdrawContext?
+ // as far as I can tell this isn't necessary because we don't have
+ // other functions that the context should be passed to
+ // struct CsRContext csrc;
+ struct TALER_WithdrawNonce nonce;
+ struct TALER_DenominationHash denom_pub_hash;
+ struct TALER_DenominationCsPublicR r_pub;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed ("nonce",
+ &nonce,
+ sizeof (struct TALER_WithdrawNonce)),
+ GNUNET_JSON_spec_fixed ("denom_pub_hash",
+ &denom_pub_hash,
+ sizeof (struct TALER_DenominationHash)),
+ GNUNET_JSON_spec_end ()
+ };
+ enum TALER_ErrorCode ec;
+ struct TEH_DenominationKey *dk;
+
+ (void) args;
+
+ memset (&nonce,
+ 0,
+ sizeof (nonce));
+ memset (&denom_pub_hash,
+ 0,
+ sizeof (denom_pub_hash));
+ memset (&r_pub,
+ 0,
+ sizeof (r_pub));
+
+ // parse input
+ {
+ enum GNUNET_GenericReturnValue res;
+
+ res = TALER_MHD_parse_json_data (rc->connection,
+ root,
+ spec);
+ GNUNET_JSON_parse_free (spec);
+ if (GNUNET_OK != res)
+ return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
+ }
+
+ // check denomination referenced by denom_pub_hash
+ {
+ MHD_RESULT mret;
+ struct TEH_KeyStateHandle *ksh;
+
+ ksh = TEH_keys_get_state ();
+ if (NULL == ksh)
+ {
+ return TALER_MHD_reply_with_error (rc->connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING,
+ NULL);
+ return mret;
+ }
+ dk = TEH_keys_denomination_by_hash2 (ksh,
+ &denom_pub_hash,
+ NULL,
+ NULL);
+ if (NULL == dk)
+ {
+ return TEH_RESPONSE_reply_unknown_denom_pub_hash (
+ rc->connection,
+ &denom_pub_hash);
+ }
+ if (GNUNET_TIME_absolute_is_past (dk->meta.expire_withdraw.abs_time))
+ {
+ /* This denomination is past the expiration time for withdraws/refreshes*/
+ return TEH_RESPONSE_reply_expired_denom_pub_hash (
+ rc->connection,
+ &denom_pub_hash,
+ GNUNET_TIME_timestamp_get (),
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_EXPIRED,
+ "CSR");
+ }
+ if (GNUNET_TIME_absolute_is_future (dk->meta.start.abs_time))
+ {
+ /* This denomination is not yet valid, no need to check
+ for idempotency! */
+ return TEH_RESPONSE_reply_expired_denom_pub_hash (
+ rc->connection,
+ &denom_pub_hash,
+ GNUNET_TIME_timestamp_get (),
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_VALIDITY_IN_FUTURE,
+ "CSR");
+ }
+ if (dk->recoup_possible)
+ {
+ /* This denomination has been revoked */
+ return TEH_RESPONSE_reply_expired_denom_pub_hash (
+ rc->connection,
+ &denom_pub_hash,
+ GNUNET_TIME_timestamp_get (),
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_REVOKED,
+ "CSR");
+ }
+ if (TALER_DENOMINATION_CS != dk->denom_pub.cipher)
+ {
+ // denomination is valid but not CS
+ return TEH_RESPONSE_reply_unknown_denom_pub_hash (
+ rc->connection,
+ &denom_pub_hash);
+ }
+ }
+
+ // derive r_pub
+ ec = TALER_EC_NONE;
+ r_pub = TEH_keys_denomination_cs_r_pub (&denom_pub_hash,
+ &nonce,
+ &ec);
+ if (TALER_EC_NONE != ec)
+ {
+ GNUNET_break (0);
+ return TALER_MHD_reply_with_ec (rc->connection,
+ ec,
+ NULL);
+ }
+
+ // send response
+ {
+ MHD_RESULT ret;
+
+ ret = TALER_MHD_REPLY_JSON_PACK (
+ rc->connection,
+ MHD_HTTP_OK,
+ GNUNET_JSON_pack_data_varsize ("r_pub_0",
+ &r_pub.r_pub[0],
+ sizeof(struct GNUNET_CRYPTO_CsRPublic)),
+ GNUNET_JSON_pack_data_varsize ("r_pub_1",
+ &r_pub.r_pub[1],
+ sizeof(struct GNUNET_CRYPTO_CsRPublic)));
+ return ret;
+ }
+}
+
+
+/* end of taler-exchange-httpd_csr.c */