api using template

4 files changed, 269 insertions, 1 deletions

diff --git a/src/include/taler_merchant_service.h b/src/include/taler_merchant_service.h
index 09292c18..c5bef549 100644
--- a/src/include/taler_merchant_service.h
+++ b/src/include/taler_merchant_service.h
@@ -4370,6 +4370,47 @@ void
 TALER_MERCHANT_template_delete_cancel (
   struct TALER_MERCHANT_TemplateDeleteHandle *tdh);
 
+/**
+ * Function called with the result of the POST /using-templates operation.
+ *
+ * @param cls closure
+ * @param hr HTTP response details
+ */
+typedef void
+(*TALER_MERCHANT_UsingTemplatesPostCallback)(
+  void *cls,
+  const struct TALER_MERCHANT_HttpResponse *hr);
+
+/**
+ * Make a POST /using-templates request to add an using template
+ *
+ * @param ctx the context
+ * @param backend_url HTTP base URL for the backend
+ * @param summary summary of the using template
+ * @param amount to pay given by the customer
+ * @param cb function to call with the backend's result
+ * @param cb_cls closure for @a cb
+ * @return the request handle; NULL upon error
+ */
+struct TALER_MERCHANT_UsingTemplatesPostHandle *
+TALER_MERCHANT_using_templates_post (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *summary,
+  struct TALER_Amount amount,
+  TALER_MERCHANT_UsingTemplatesPostCallback cb,
+  void *cb_cls);
+
+
+/**
+ * Cancel POST /using-templates operation.
+ *
+ * @param utph operation to cancel
+ */
+void
+TALER_MERCHANT_using_templates_post_cancel (
+  struct TALER_MERCHANT_UsingTemplatesPostHandle *utph);
+
 
 /* ********************* /webhooks *********************** */
 
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 7d212c3b..7451b24d 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -58,6 +58,7 @@ libtalermerchant_la_SOURCES = \
   merchant_api_post_reserves.c \
   merchant_api_post_transfers.c \
   merchant_api_post_templates.c \
+  merchant_api_post_using_templates.c \
   merchant_api_post_webhooks.c \
   merchant_api_tip_authorize.c \
   merchant_api_tip_pickup.c \
diff --git a/src/lib/merchant_api_post_templates.c b/src/lib/merchant_api_post_templates.c
index 002896ed..300039a4 100644
--- a/src/lib/merchant_api_post_templates.c
+++ b/src/lib/merchant_api_post_templates.c
@@ -68,7 +68,6 @@ struct TALER_MERCHANT_TemplatesPostHandle
    * Minor context that holds body and headers.
    */
   struct TALER_CURL_PostContext post_ctx;
-
 };
 
 
diff --git a/src/lib/merchant_api_post_using_templates.c b/src/lib/merchant_api_post_using_templates.c
new file mode 100644
index 00000000..278fcac8
--- /dev/null
+++ b/src/lib/merchant_api_post_using_templates.c
@@ -0,0 +1,227 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020-2021 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 merchant_api_post_using_templates.c
+ * @brief Implementation of the POST /using_templates request
+ *        of the merchant's HTTP API
+ * @author Priscilla HUANG
+ */
+#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 "taler_merchant_service.h"
+#include "merchant_api_curl_defaults.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_curl_lib.h>
+
+
+/**
+ * Handle for a POST /templates/$ID operation.
+ */
+struct TALER_MERCHANT_UsingTemplatesPostHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_UsingTemplatesPostCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+  /**
+   * Minor context that holds body and headers.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+};
+
+/**
+ * Function called when we're done processing the
+ * HTTP POST /using-templates request.
+ *
+ * @param cls the `struct TALER_MERCHANT_UsingTemplatesPostHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_post_using_templates_finished (void *cls,
+                                      long response_code,
+                                      const void *response)
+{
+  struct TALER_MERCHANT_UsingTemplatesPostHandle *utph = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  utph->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+              "POST /using-templates completed with response code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case 0:
+    hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+    break;
+  case MHD_HTTP_NO_CONTENT:
+    break;
+  case MHD_HTTP_BAD_REQUEST:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* This should never happen, either us
+     * or the merchant is buggy (or API version conflict);
+     * just pass JSON reply to the application */
+    break;
+  case MHD_HTTP_UNAUTHORIZED:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* Nothing really to verify, merchant says we need to authenticate. */
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* Nothing really to verify, merchant says we tried to abort the payment
+     * after it was successful. We should pass the JSON reply to the
+     * application */
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* Nothing really to verify, this should never
+       happen, we should pass the JSON reply to the
+       application */
+    break;
+  case MHD_HTTP_CONFLICT:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  case MHD_HTTP_INTERNAL_SERVER_ERROR:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    /* Server had an internal issue; we should retry,
+       but this API leaves this to the application */
+    break;
+  default:
+    TALER_MERCHANT_parse_error_details_ (json,
+                                         response_code,
+                                         &hr);
+    /* unexpected response code */
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    GNUNET_break_op (0);
+    break;
+  } /* end of the switch */
+  utph->cb (utph->cb_cls,
+            &hr);
+  TALER_MERCHANT_using_templates_post_cancel (utph);
+}
+
+
+struct TALER_MERCHANT_UsingTemplatesPostHandle *
+TALER_MERCHANT_using_templates_post (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *summary,
+  struct TALER_Amount amount,
+  TALER_MERCHANT_UsingTemplatesPostCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_UsingTemplatesPostHandle *utph;
+  json_t *req_obj;
+
+  req_obj = GNUNET_JSON_PACK (
+    GNUNET_JSON_pack_allow_null (
+      GNUNET_JSON_pack_string ("summary",
+                               summary)),
+    GNUNET_JSON_pack_allow_null (
+      TALER_JSON_pack_amount ("amount",
+                              &amount)));
+  utph = GNUNET_new (struct TALER_MERCHANT_UsingTemplatesPostHandle);
+  utph->ctx = ctx;
+  utph->cb = cb;
+  utph->cb_cls = cb_cls;
+  utph->url = TALER_url_join (backend_url,
+                             "/templates",
+                             NULL);
+  if (NULL == utph->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    json_decref (req_obj);
+    GNUNET_free (utph);
+    return NULL;
+  }
+  {
+    CURL *eh;
+
+    eh = TALER_MERCHANT_curl_easy_get_ (utph->url);
+    GNUNET_assert (GNUNET_OK ==
+                   TALER_curl_easy_post (&utph->post_ctx,
+                                         eh,
+                                         req_obj));
+    json_decref (req_obj);
+    utph->job = GNUNET_CURL_job_add2 (ctx,
+                                     eh,
+                                     utph->post_ctx.headers,
+                                     &handle_post_using_templates_finished,
+                                     utph);
+    GNUNET_assert (NULL != utph->job);
+  }
+  return utph;
+}
+
+
+void
+TALER_MERCHANT_using_templates_post_cancel (
+  struct TALER_MERCHANT_UsingTemplatesPostHandle *utph)
+{
+  if (NULL != utph->job)
+  {
+    GNUNET_CURL_job_cancel (utph->job);
+    utph->job = NULL;
+  }
+  TALER_curl_easy_post_finished (&utph->post_ctx);
+  GNUNET_free (utph->url);
+  GNUNET_free (utph);
+}
+
+
+/* end of merchant_api_post_using_templates.c */