testing and lib sources for new endpoint

1 files changed, 448 insertions, 0 deletions

diff --git a/src/lib/merchant_api_wallet_post_order_refund.c b/src/lib/merchant_api_wallet_post_order_refund.c
new file mode 100644
index 00000000..2c63dc17
--- /dev/null
+++ b/src/lib/merchant_api_wallet_post_order_refund.c
@@ -0,0 +1,448 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER 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; either version 2.1, 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 Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License along with
+  TALER; see the file COPYING.LGPL.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/merchant_api_wallet_post_order_refund.c
+ * @brief Implementation of the (public) POST /orders/ID/refund request
+ * @author Jonathan Buchanan
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+#include <taler/taler_curl_lib.h>
+
+
+/**
+ * Handle for a (public) POST /orders/ID/refund operation.
+ */
+struct TALER_MERCHANT_WalletOrderRefundHandle
+{
+  /**
+   * Complete URL where the backend offers /refund
+   */
+  char *url;
+
+  /**
+   * Minor context that holds body and headers.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+
+  /**
+   * The CURL context to connect to the backend
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+  /**
+   * The callback to pass the backend response to
+   */
+  TALER_MERCHANT_WalletRefundCallback cb;
+
+  /**
+   * Clasure to pass to the callback
+   */
+  void *cb_cls;
+
+  /**
+   * Handle for the request
+   */
+  struct GNUNET_CURL_Job *job;
+};
+
+
+/**
+ * Convenience function to call the callback in @a owgh with an error code of
+ * @a ec and the exchange body being set to @a reply.
+ *
+ * @param owgh handle providing callback
+ * @param ec error code to return to application
+ * @param reply JSON reply we got from the exchange, can be NULL
+ */
+static void
+cb_failure (struct TALER_MERCHANT_WalletOrderRefundHandle *orh,
+            enum TALER_ErrorCode ec,
+            const json_t *reply)
+{
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .ec = TALER_EC_CHECK_PAYMENT_RESPONSE_MALFORMED,
+    .reply = reply
+  };
+
+  orh->cb (orh->cb_cls,
+           &hr,
+           NULL,
+           NULL,
+           NULL,
+           0);
+}
+
+
+/**
+ * Callback to process (public) POST /orders/ID/refund response
+ *
+ * @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param json response body, NULL if not JSON
+ */
+static void
+handle_refund_finished (void *cls,
+                        long response_code,
+                        const void *response)
+{
+  struct TALER_MERCHANT_WalletOrderRefundHandle *orh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  orh->job = NULL;
+
+  switch (response_code)
+  {
+  case 0:
+    hr.ec = TALER_EC_INVALID_RESPONSE;
+    orh->cb (orh->cb_cls,
+             &hr,
+             NULL,
+             NULL,
+             NULL,
+             0);
+    break;
+  case MHD_HTTP_OK:
+    {
+      struct TALER_Amount refund_amount;
+      json_t *refunds;
+      struct TALER_MerchantPublicKeyP merchant_pub;
+      unsigned int refund_len;
+      struct GNUNET_JSON_Specification spec[] = {
+        TALER_JSON_spec_amount ("refund_amount",
+                                &refund_amount),
+        GNUNET_JSON_spec_json ("refunds",
+                               &refunds),
+        GNUNET_JSON_spec_fixed_auto ("merchant_pub",
+                                     &merchant_pub),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (json,
+                             spec,
+                             NULL, NULL))
+      {
+        GNUNET_break_op (0);
+        cb_failure (orh,
+                    TALER_EC_CHECK_PAYMENT_RESPONSE_MALFORMED,
+                    json);
+        TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
+        return;
+      }
+
+      if (! json_is_array (refunds))
+      {
+        GNUNET_break_op (0);
+        cb_failure (orh,
+                    TALER_EC_CHECK_PAYMENT_RESPONSE_MALFORMED,
+                    json);
+        GNUNET_JSON_parse_free (spec);
+        TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
+        return;
+      }
+
+      refund_len = json_array_size (refunds);
+      {
+        struct TALER_MERCHANT_RefundDetail rds[refund_len];
+
+        memset (rds,
+                0,
+                sizeof (rds));
+        for (unsigned int i = 0; i<refund_len; i++)
+        {
+          struct TALER_MERCHANT_RefundDetail *rd = &rds[i];
+          const json_t *jrefund = json_array_get (refunds,
+                                                  i);
+          const char *refund_status_type;
+          uint32_t exchange_status;
+          int ret;
+          struct GNUNET_JSON_Specification espec[] = {
+            GNUNET_JSON_spec_uint32 ("exchange_status",
+                                     &exchange_status),
+            GNUNET_JSON_spec_end ()
+          };
+
+          if (GNUNET_OK !=
+              GNUNET_JSON_parse (jrefund,
+                                 espec,
+                                 NULL, NULL))
+          {
+            GNUNET_break_op (0);
+            cb_failure (orh,
+                        TALER_EC_CHECK_PAYMENT_RESPONSE_MALFORMED,
+                        json);
+            TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
+            return;
+          }
+
+          if (MHD_HTTP_OK == exchange_status)
+          {
+            struct GNUNET_JSON_Specification rspec[] = {
+              GNUNET_JSON_spec_string ("type",
+                                       &refund_status_type),
+              GNUNET_JSON_spec_fixed_auto ("exchange_sig",
+                                           &rd->exchange_sig),
+              GNUNET_JSON_spec_fixed_auto ("exchange_pub",
+                                           &rd->exchange_pub),
+              GNUNET_JSON_spec_uint64 ("rtransaction_id",
+                                       &rd->rtransaction_id),
+              GNUNET_JSON_spec_fixed_auto ("coin_pub",
+                                           &rd->coin_pub),
+              TALER_JSON_spec_amount ("refund_amount",
+                                      &rd->refund_amount),
+              GNUNET_JSON_spec_end ()
+            };
+
+            ret = GNUNET_JSON_parse (jrefund,
+                                     rspec,
+                                     NULL, NULL);
+            if (GNUNET_OK == ret)
+            {
+              /* check that type field is correct */
+              if (0 != strcmp ("success", refund_status_type))
+              {
+                GNUNET_break_op (0);
+                ret = GNUNET_SYSERR;
+              }
+            }
+          }
+          else
+          {
+            struct GNUNET_JSON_Specification rspec[] = {
+              GNUNET_JSON_spec_string ("type",
+                                       &refund_status_type),
+              GNUNET_JSON_spec_fixed_auto ("coin_pub",
+                                           &rd->coin_pub),
+              GNUNET_JSON_spec_uint64 ("rtransaction_id",
+                                       &rd->rtransaction_id),
+              TALER_JSON_spec_amount ("refund_amount",
+                                      &rd->refund_amount),
+              GNUNET_JSON_spec_end ()
+            };
+
+            ret = GNUNET_JSON_parse (jrefund,
+                                     rspec,
+                                     NULL, NULL);
+            if (GNUNET_OK == ret)
+            {
+              /* parse optional arguments */
+              json_t *jec;
+
+              jec = json_object_get (jrefund,
+                                     "exchange_code");
+              if (NULL != jec)
+              {
+                if (! json_is_integer (jec))
+                {
+                  GNUNET_break_op (0);
+                  ret = GNUNET_SYSERR;
+                }
+                else
+                {
+                  rd->hr.ec = (enum TALER_ErrorCode) json_integer_value (jec);
+                }
+              }
+              rd->hr.reply = json_object_get (jrefund,
+                                              "exchange_reply");
+              /* check that type field is correct */
+              if (0 != strcmp ("failure", refund_status_type))
+              {
+                GNUNET_break_op (0);
+                ret = GNUNET_SYSERR;
+              }
+            }
+          }
+          if (GNUNET_OK != ret)
+          {
+            GNUNET_break_op (0);
+            cb_failure (orh,
+                        TALER_EC_CHECK_PAYMENT_RESPONSE_MALFORMED,
+                        json);
+            TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
+            return;
+          }
+          rd->hr.http_status = exchange_status;
+        }
+
+        {
+          struct TALER_MERCHANT_HttpResponse hr = {
+            .reply = json,
+            .http_status = MHD_HTTP_OK
+          };
+
+          orh->cb (orh->cb_cls,
+                   &hr,
+                   &refund_amount,
+                   &merchant_pub,
+                   rds,
+                   refund_len);
+        }
+      }
+      GNUNET_JSON_parse_free (spec);
+    }
+    break;
+  case MHD_HTTP_NO_CONTENT:
+    orh->cb (orh->cb_cls,
+             &hr,
+             NULL,
+             NULL,
+             NULL,
+             0);
+    break;
+  case MHD_HTTP_CONFLICT:
+  case MHD_HTTP_NOT_FOUND:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    orh->cb (orh->cb_cls,
+             &hr,
+             NULL,
+             NULL,
+             NULL,
+             0);
+    break;
+  default:
+    GNUNET_break_op (0); /* unexpected status code */
+    TALER_MERCHANT_parse_error_details_ (json,
+                                         response_code,
+                                         &hr);
+    orh->cb (orh->cb_cls,
+             &hr,
+             NULL,
+             NULL,
+             NULL,
+             0);
+    break;
+  }
+  TALER_MERCHANT_wallet_post_order_refund_cancel (orh);
+}
+
+
+/**
+ * Obtain the refunds that have been granted for an order.
+ *
+ * @param ctx the CURL context used to connect to the backend
+ * @param backend_url backend's base URL, including final "/"
+ * @param order_id id of the order whose refund is to be increased
+ * @param h_contract_terms hash of the contract terms of the order
+ * @param cb callback processing the response from /refund
+ * @param cb_cls closure for cb
+ */
+struct TALER_MERCHANT_WalletOrderRefundHandle *
+TALER_MERCHANT_wallet_post_order_refund (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *order_id,
+  const struct GNUNET_HashCode *h_contract_terms,
+  TALER_MERCHANT_WalletRefundCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_WalletOrderRefundHandle *orh;
+  json_t *req;
+  CURL *eh;
+
+  orh = GNUNET_new (struct TALER_MERCHANT_WalletOrderRefundHandle);
+  orh->ctx = ctx;
+  orh->cb = cb;
+  orh->cb_cls = cb_cls;
+  {
+    char *path;
+
+    GNUNET_asprintf (&path,
+                     "orders/%s/refund",
+                     order_id);
+    orh->url = TALER_url_join (backend_url,
+                               path,
+                               NULL);
+    GNUNET_free (path);
+  }
+  if (NULL == orh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (orh);
+    return NULL;
+  }
+  req = json_pack ("{s:o}",
+                   "h_contract",
+                   GNUNET_JSON_from_data_auto (h_contract_terms));
+  GNUNET_assert (NULL != req);
+  eh = curl_easy_init ();
+  GNUNET_assert (NULL != eh);
+  if (GNUNET_OK !=
+      TALER_curl_easy_post (&orh->post_ctx,
+                            eh,
+                            req))
+  {
+    GNUNET_break (0);
+    json_decref (req);
+    GNUNET_free (orh->url);
+    GNUNET_free (orh);
+    return NULL;
+  }
+  json_decref (req);
+  GNUNET_assert (CURLE_OK ==
+                 curl_easy_setopt (eh,
+                                   CURLOPT_URL,
+                                   orh->url));
+  orh->job = GNUNET_CURL_job_add2 (ctx,
+                                   eh,
+                                   orh->post_ctx.headers,
+                                   &handle_refund_finished,
+                                   orh);
+  if (NULL == orh->job)
+  {
+    GNUNET_free (orh->url);
+    GNUNET_free (orh);
+    return NULL;
+  }
+  return orh;
+}
+
+
+/**
+ * Cancel a (public) POST /refund request.
+ *
+ * @param orh the refund operation to cancel
+ */
+void
+TALER_MERCHANT_wallet_post_order_refund_cancel (
+  struct TALER_MERCHANT_WalletOrderRefundHandle *orh)
+{
+  if (NULL != orh->job)
+  {
+    GNUNET_CURL_job_cancel (orh->job);
+    orh->job = NULL;
+  }
+  TALER_curl_easy_post_finished (&orh->post_ctx);
+  GNUNET_free (orh->url);
+  GNUNET_free (orh);
+}
+
+
+/* end of merchant_api_wallet_post_order_refund.c */