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authorChristian Grothoff <grothoff@gnunet.org>2022-04-11 13:52:06 +0200
committerChristian Grothoff <grothoff@gnunet.org>2022-04-11 13:52:06 +0200
commit72dd9514aac1b59b81fc695b734de518cef1845b (patch)
tree61c8dbb78bc0b979d6331924f60f504a34c6200d /src/lib
parentf9971faa7a6fa5e5e7aa5ee6acdad3d45cfeea1b (diff)
-draft implementation of /purses//merge endpoint
Diffstat (limited to 'src/lib')
-rw-r--r--src/lib/exchange_api_purse_merge.c408
1 files changed, 408 insertions, 0 deletions
diff --git a/src/lib/exchange_api_purse_merge.c b/src/lib/exchange_api_purse_merge.c
new file mode 100644
index 000000000..8f6723ee6
--- /dev/null
+++ b/src/lib/exchange_api_purse_merge.c
@@ -0,0 +1,408 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2022 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 lib/exchange_api_purse_merge.c
+ * @brief Implementation of the client to merge a purse
+ * into an account
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_json_lib.h"
+#include "taler_exchange_service.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A purse merge with deposit handle
+ */
+struct TALER_EXCHANGE_AccountMergeHandle
+{
+
+ /**
+ * The connection to exchange this request handle will use
+ */
+ struct TALER_EXCHANGE_Handle *exchange;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Context for #TEH_curl_easy_post(). Keeps the data that must
+ * persist for Curl to make the upload.
+ */
+ struct TALER_CURL_PostContext ctx;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_AccountMergeCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Expected value in the purse after fees.
+ */
+ struct TALER_Amount purse_value_after_fees;
+
+ /**
+ * Public key of the merge capability.
+ */
+ struct TALER_AccountMergePublicKeyP merge_pub;
+
+ /**
+ * Public key of the purse.
+ */
+ struct TALER_PurseContractPublicKeyP purse_pub;
+
+ /**
+ * Hash over the purse's contrac terms.
+ */
+ struct TALER_PrivateContractHashP h_contract_terms;
+
+ /**
+ * When does the purse expire.
+ */
+ struct GNUNET_TIME_Timestamp purse_expiration;
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /purse/$PID/merge request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_AccountMergeHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_purse_merge_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_AccountMergeHandle *pch = cls;
+ const json_t *j = response;
+ struct TALER_EXCHANGE_AccountMergeResponse dr = {
+ .hr.reply = j,
+ .hr.http_status = (unsigned int) response_code
+ };
+
+ pch->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+ break;
+ case MHD_HTTP_OK:
+ {
+ const struct TALER_EXCHANGE_Keys *key_state;
+ struct GNUNET_TIME_Timestamp etime;
+ struct TALER_Amount total_deposited;
+ struct TALER_ExchangeSignatureP exchange_sig;
+ struct TALER_ExchangePublicKeyP exchange_pub;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("exchange_sig",
+ &exchange_sig),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub",
+ &exchange_pub),
+ GNUNET_JSON_spec_timestamp ("exchange_timestamp",
+ &etime),
+ TALER_JSON_spec_amount ("total_deposited",
+ pch->purse_value_after_fees.currency,
+ &total_deposited),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ dr.hr.http_status = 0;
+ dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ break;
+ }
+ key_state = TALER_EXCHANGE_get_keys (pch->exchange);
+ if (GNUNET_OK !=
+ TALER_EXCHANGE_test_signing_key (key_state,
+ &exchange_pub))
+ {
+ GNUNET_break_op (0);
+ dr.hr.http_status = 0;
+ dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
+ break;
+ }
+ if (GNUNET_OK !=
+ TALER_exchange_online_purse_merged_verify (
+ etime,
+ pch->purse_expiration,
+ &pch->purse_value_after_fees,
+ &total_deposited,
+ &pch->purse_pub,
+ &pch->merge_pub,
+ &pch->h_contract_terms,
+ &exchange_pub,
+ &exchange_sig))
+ {
+ GNUNET_break_op (0);
+ dr.hr.http_status = 0;
+ dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
+ break;
+ }
+ }
+ break;
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the exchange is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_FORBIDDEN:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* Nothing really to verify, exchange says one of the signatures is
+ invalid; as we checked them, this should never happen, we
+ should pass the JSON reply to the application */
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* Nothing really to verify, this should never
+ happen, we should pass the JSON reply to the application */
+ break;
+ case MHD_HTTP_CONFLICT:
+ // FIXME: check reply!
+ break;
+ case MHD_HTTP_GONE:
+ /* could happen if denomination was revoked */
+ /* Note: one might want to check /keys for revocation
+ signature here, alas tricky in case our /keys
+ is outdated => left to clients */
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ break;
+ default:
+ /* unexpected response code */
+ dr.hr.ec = TALER_JSON_get_error_code (j);
+ dr.hr.hint = TALER_JSON_get_error_hint (j);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u/%d for exchange deposit\n",
+ (unsigned int) response_code,
+ dr.hr.ec);
+ GNUNET_break_op (0);
+ break;
+ }
+ pch->cb (pch->cb_cls,
+ &dr);
+ TALER_EXCHANGE_purse_merge_with_deposit_cancel (pch);
+}
+
+
+struct TALER_EXCHANGE_AccountMergeHandle *
+TALER_EXCHANGE_account_merge (
+ struct TALER_EXCHANGE_Handle *exchange,
+ const char *reserve_exchange_url,
+ const struct TALER_ReservePrivateKeyP *reserve_priv,
+ const struct TALER_PurseContractPublicKeyP *purse_pub,
+ const struct TALER_PurseMergePrivateKeyP *merge_priv,
+ const struct TALER_PrivateContractHashP *h_contract_terms,
+ uint8_t min_age,
+ const struct TALER_Amount *purse_value_after_fees,
+ struct GNUNET_TIME_Timestamp purse_expiration,
+ struct GNUNET_TIME_Timestamp merge_timestamp,
+ TALER_EXCHANGE_AccountMergeCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_AccountMergeHandle *pch;
+ struct GNUNET_CURL_Context *ctx;
+ json_t *merge_obj;
+ CURL *eh;
+ struct TALER_PurseMergeSignatureP merge_sig;
+ struct TALER_ReserveSignatureP account_sig;
+ char arg_str[sizeof (pch->purse_pub) * 2 + 32];
+ char *url;
+ char *reserve_url;
+
+ pch = GNUNET_new (struct TALER_EXCHANGE_AccountMergeHandle);
+ pch->exchange = exchange;
+ pch->cb = cb;
+ pch->cb_cls = cb_cls;
+ pch->merge_timestamp = merge_timestamp;
+ pch->purse_pub = *purse_pub;
+ pch->h_contract_terms = *h_contract_terms;
+ pch->purse_expiration = purse_expiration;
+ pch->purse_value_after_fees = *purse_value_after_fees;
+ GNUNET_assert (GNUNET_YES ==
+ TEAH_handle_is_ready (exchange));
+ {
+ char pub_str[sizeof (*purse_pub) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (
+ purse_pub,
+ sizeof (*purse_pub),
+ pub_str,
+ sizeof (pub_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/purses/%s/merge",
+ pub_str);
+ }
+ {
+ struct TALER_ReservePublicKeyP reserve_pub;
+ char pub_str[sizeof (reserve_pub) * 2];
+ char *end;
+ const char *exchange_url;
+ bool is_http;
+
+ GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
+ &reserve_pub.eddsa_pub);
+
+ end = GNUNET_STRINGS_data_to_string (
+ &reserve_pub,
+ sizeof (reserve_pub),
+ pub_str,
+ sizeof (pub_str));
+ *end = '\0';
+ if (0 == strncmp (reserve_exchange_url,
+ "http://",
+ strlen ("http://")))
+ {
+ is_http = true;
+ exchange_url = &reserve_exchange_url[strlen ("http://")];
+ }
+ else if (0 == strncmp (reserve_exchange_url,
+ "https://",
+ strlen ("https://")))
+ {
+ is_http = false;
+ exchange_url = &reserve_exchange_url[strlen ("https://")];
+ }
+ else
+ {
+ GNUNET_break (0);
+ GNUNET_free (pch);
+ return NULL;
+ }
+ GNUNET_asprintf (&reserve_url,
+ "payto://%s/%s/%s",
+ is_http ? "taler+http" : "taler",
+ pub_str,
+ exchange_url);
+ }
+ pch->url = TEAH_path_to_url (exchange,
+ arg_str);
+ if (NULL == pch->url)
+ {
+ GNUNET_break (0);
+ GNUNET_free (pch);
+ return NULL;
+ }
+ GNUNET_CRYPTO_eddsa_key_get_public (&merge_priv->eddsa_priv,
+ &pch->merge_pub.eddsa_pub);
+ TALER_wallet_purse_merge_sign (reserve_url,
+ merge_timestamp,
+ purse_pub,
+ merge_priv,
+ &merge_sig);
+ TALER_wallet_account_merge_sign (merge_timestamp,
+ purse_pub,
+ purse_expiration,
+ h_contract_terms,
+ purse_value_after_fees,
+ min_age,
+ reserve_priv,
+ &reserve_sig);
+ merge_obj = GNUNET_JSON_PACK (
+ GNUNET_JSON_pack_string ("payto_uri",
+ reserve_url),
+ GNUNET_JSON_pack_data_auto ("merge_sig",
+ &merge_sig),
+ GNUNET_JSON_pack_data_auto ("reserve_sig",
+ &reserve_sig),
+ GNUNET_JSON_pack_timestamp ("merge_timestamp",
+ merge_timestamp));
+ GNUNET_assert (NULL != merge_obj);
+ eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
+ if ( (NULL == eh) ||
+ (GNUNET_OK !=
+ TALER_curl_easy_post (&pch->ctx,
+ eh,
+ merge_obj)) )
+ {
+ GNUNET_break (0);
+ if (NULL != eh)
+ curl_easy_cleanup (eh);
+ json_decref (merge_obj);
+ GNUNET_free (pch->url);
+ GNUNET_free (pch);
+ return NULL;
+ }
+ json_decref (merge_obj);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "URL for purse merge with deposit: `%s'\n",
+ pch->url);
+ ctx = TEAH_handle_to_context (exchange);
+ pch->job = GNUNET_CURL_job_add2 (ctx,
+ eh,
+ pch->ctx.headers,
+ &handle_purse_merge_deposit_finished,
+ pch);
+ return pch;
+}
+
+
+void
+TALER_EXCHANGE_account_merge_cancel (
+ struct TALER_EXCHANGE_AccountMergeHandle *pch)
+{
+ if (NULL != pch->job)
+ {
+ GNUNET_CURL_job_cancel (pch->job);
+ pch->job = NULL;
+ }
+ GNUNET_free (pch->url);
+ TALER_curl_easy_post_finished (&pch->ctx);
+ GNUNET_free (pch);
+}
+
+
+/* end of exchange_api_purse_merge.c */
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