major refactoring, eliminating wire-plugins and moving towards new bank API. main code compiles, testcases known to fail, code sure not to fully work yet

1 files changed, 368 insertions, 0 deletions

diff --git a/src/bank-lib/bank_api_transaction.c b/src/bank-lib/bank_api_transaction.c
new file mode 100644
index 000000000..177328482
--- /dev/null
+++ b/src/bank-lib/bank_api_transaction.c
@@ -0,0 +1,368 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2015--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 bank-lib/bank_api_transaction.c
+ * @brief Implementation of the /transaction/ requests of the bank's HTTP API
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "bank_api_common.h"
+#include <microhttpd.h> /* just for HTTP status codes */
+#include "taler_signatures.h"
+#include "taler_curl_lib.h"
+#include "taler_bank_service.h"
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Data structure serialized in the prepare stage.
+ */
+struct WirePackP
+{
+  /**
+   * Random unique identifier for the request.
+   */
+  struct GNUNET_HashCode request_uid;
+
+  /**
+   * Amount to be transferred.
+   */
+  struct TALER_AmountNBO amount;
+
+  /**
+   * Wire transfer identifier to use.
+   */
+  struct TALER_WireTransferIdentifierRawP wtid;
+
+  /**
+   * Length of the payto:// URL of the target account,
+   * including 0-terminator, in network byte order.
+   */
+  uint32_t account_len GNUNET_PACKED;
+
+  /**
+   * Length of the exchange's base URL,
+   * including 0-terminator, in network byte order.
+   */
+  uint32_t exchange_url_len GNUNET_PACKED;
+
+};
+
+GNUNET_NETWORK_STRUCT_END
+
+/**
+ * Prepare for exeuction of a wire transfer.
+ *
+ * @param destination_account_url payto:// URL identifying where to send the money
+ * @param amount amount to transfer, already rounded
+ * @param exchange_base_url base URL of this exchange (included in subject
+ *        to facilitate use of tracking API by merchant backend)
+ * @param wtid wire transfer identifier to use
+ * @param buf[out] set to transaction data to persist, NULL on error
+ * @param buf_size[out] set to number of bytes in @a buf, 0 on error
+ */
+void
+TALER_BANK_prepare_wire_transfer (const char *destination_account_url,
+                                  const struct TALER_Amount *amount,
+                                  const char *exchange_base_url,
+                                  const struct
+                                  TALER_WireTransferIdentifierRawP *wtid,
+                                  void **buf,
+                                  size_t *buf_size)
+{
+  struct WirePackP *wp;
+  size_t d_len = strlen (destination_account_url) + 1;
+  size_t u_len = strlen (exchange_base_url) + 1;
+  char *end;
+
+  *buf_size = sizeof (*wp) + d_len + u_len;
+  wp = GNUNET_malloc (*buf_size);
+  GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE,
+                                    &wp->request_uid);
+  TALER_amount_hton (&wp->amount,
+                     amount);
+  wp->wtid = *wtid;
+  wp->account_len = htonl ((uint32_t) d_len);
+  wp->exchange_url_len = htonl ((uint32_t) u_len);
+  end = (char *) &wp[1];
+  memcpy (end,
+          destination_account_url,
+          d_len);
+  memcpy (end + d_len,
+          exchange_base_url,
+          u_len);
+  *buf = (char *) wp;
+}
+
+
+/**
+ * @brief An transaction Handle
+ */
+struct TALER_BANK_WireExecuteHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *request_url;
+
+  /**
+   * POST context.
+   */
+  struct TEAH_PostContext post_ctx;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_BANK_ConfirmationCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /transaction request.
+ *
+ * @param cls the `struct TALER_BANK_WireExecuteHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_transaction_finished (void *cls,
+                             long response_code,
+                             const void *response)
+{
+  struct TALER_BANK_WireExecuteHandle *weh = cls;
+  uint64_t row_id = UINT64_MAX;
+  struct GNUNET_TIME_Absolute timestamp;
+  enum TALER_ErrorCode ec;
+  const json_t *j = response;
+
+  weh->job = NULL;
+  timestamp = GNUNET_TIME_UNIT_FOREVER_ABS;
+  switch (response_code)
+  {
+  case 0:
+    ec = TALER_EC_INVALID_RESPONSE;
+    break;
+  case MHD_HTTP_OK:
+    {
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_uint64 ("row_id",
+                                 &row_id),
+        GNUNET_JSON_spec_absolute_time ("timestamp",
+                                        &timestamp),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (j,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        response_code = 0;
+        ec = TALER_EC_INVALID_RESPONSE;
+        break;
+      }
+      ec = TALER_EC_NONE;
+    }
+    break;
+  case MHD_HTTP_BAD_REQUEST:
+    /* This should never happen, either us or the bank is buggy
+       (or API version conflict); just pass JSON reply to the application */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    /* Access denied */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  case MHD_HTTP_UNAUTHORIZED:
+    /* Nothing really to verify, bank says one of the signatures is
+       invalid; as we checked them, this should never happen, we
+       should pass the JSON reply to the application */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the application */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  case MHD_HTTP_NOT_ACCEPTABLE:
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the application */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  case MHD_HTTP_INTERNAL_SERVER_ERROR:
+    /* Server had an internal issue; we should retry, but this API
+       leaves this to the application */
+    ec = TALER_BANK_parse_ec_ (j);
+    break;
+  default:
+    /* unexpected response code */
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u\n",
+                (unsigned int) response_code);
+    GNUNET_break (0);
+    ec = TALER_BANK_parse_ec_ (j);
+    response_code = 0;
+    break;
+  }
+  weh->cb (weh->cb_cls,
+           response_code,
+           ec,
+           row_id,
+           timestamp);
+  TALER_BANK_execute_wire_transfer_cancel (weh);
+}
+
+
+/**
+ * Execute a wire transfer.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param buf buffer with the prepared execution details
+ * @param buf_size number of bytes in @a buf
+ * @param cc function to call upon success
+ * @param cc_cls closure for @a cc
+ * @return NULL on error
+ */
+struct TALER_BANK_WireExecuteHandle *
+TALER_BANK_execute_wire_transfer (struct GNUNET_CURL_Context *ctx,
+                                  const char *bank_base_url,
+                                  const struct
+                                  TALER_BANK_AuthenticationData *auth,
+                                  const void *buf,
+                                  size_t buf_size,
+                                  TALER_BANK_ConfirmationCallback cc,
+                                  void *cc_cls)
+{
+  struct TALER_BANK_WireExecuteHandle *weh;
+  json_t *transaction_obj;
+  CURL *eh;
+  const struct WirePackP *wp = buf;
+  uint32_t d_len;
+  uint32_t u_len;
+  const char *destination_account_url;
+  const char *exchange_base_url;
+  struct TALER_Amount amount;
+
+  if (sizeof (*wp) > buf_size)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  d_len = ntohl (wp->account_len);
+  u_len = ntohl (wp->exchange_url_len);
+  if (sizeof (*wp) + d_len + u_len != buf_size)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  destination_account_url = (const char *) &wp[1];
+  exchange_base_url = destination_account_url + d_len;
+  if (NULL == bank_base_url)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  TALER_amount_ntoh (&amount,
+                     &wp->amount);
+  transaction_obj = json_pack ("{s:o, s:o, s:s, s:o, s:o, s:s}",
+                               "request_uid", GNUNET_JSON_from_data_auto (
+                                 &wp->request_uid),
+                               "amount", TALER_JSON_from_amount (&amount),
+                               "exchange_url", exchange_base_url,
+                               "wtid", GNUNET_JSON_from_data_auto (&wp->wtid),
+                               "credit_account", destination_account_url);
+  if (NULL == transaction_obj)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  weh = GNUNET_new (struct TALER_BANK_WireExecuteHandle);
+  weh->cb = cc;
+  weh->cb_cls = cc_cls;
+  weh->request_url = TALER_BANK_path_to_url_ (bank_base_url,
+                                              "/transaction");
+  weh->post_ctx.headers = curl_slist_append
+                            (weh->post_ctx.headers,
+                            "Content-Type: application/json");
+
+  eh = curl_easy_init ();
+  if ( (GNUNET_OK !=
+        TALER_BANK_setup_auth_ (eh,
+                                auth)) ||
+       (CURLE_OK !=
+        curl_easy_setopt (eh,
+                          CURLOPT_URL,
+                          weh->request_url)) ||
+       (GNUNET_OK !=
+        TALER_curl_easy_post (&weh->post_ctx,
+                              eh,
+                              transaction_obj)) )
+  {
+    GNUNET_break (0);
+    TALER_BANK_execute_wire_transfer_cancel (weh);
+    curl_easy_cleanup (eh);
+    json_decref (transaction_obj);
+    return NULL;
+  }
+  json_decref (transaction_obj);
+
+  weh->job = GNUNET_CURL_job_add2 (ctx,
+                                   eh,
+                                   weh->post_ctx.headers,
+                                   &handle_transaction_finished,
+                                   weh);
+  return weh;
+}
+
+
+/**
+ * Cancel a wire transfer.  This function cannot be used on a request handle
+ * if a response is already served for it.
+ *
+ * @param weh the wire transfer request handle
+ */
+void
+TALER_BANK_execute_wire_transfer_cancel (struct
+                                         TALER_BANK_WireExecuteHandle *weh)
+{
+  if (NULL != weh->job)
+  {
+    GNUNET_CURL_job_cancel (weh->job);
+    weh->job = NULL;
+  }
+  TALER_curl_easy_post_finished (&weh->post_ctx);
+  GNUNET_free (weh->request_url);
+  GNUNET_free (weh);
+}
+
+
+/* end of bank_api_transaction.c */