webhook

1 files changed, 251 insertions, 0 deletions

diff --git a/src/lib/merchant_api_get_webhooks.c b/src/lib/merchant_api_get_webhooks.c
new file mode 100644
index 00000000..c80a94b9
--- /dev/null
+++ b/src/lib/merchant_api_get_webhooks.c
@@ -0,0 +1,251 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2018, 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 merchant_api_get_webhooks.c
+ * @brief Implementation of the GET /webhooks 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 <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include "merchant_api_curl_defaults.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+
+
+/**
+ * Handle for a GET /webhooks operation.
+ */
+struct TALER_MERCHANT_WebhooksGetHandle
+{
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_WebhooksGetCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+
+};
+
+
+/**
+ * Parse webhook information from @a ia.
+ *
+ * @param ia JSON array (or NULL!) with webhook data
+ * @param wgh operation handle
+ * @return #GNUNET_OK on success
+ */
+static int
+parse_webhooks (const json_t *ia,
+                struct TALER_MERCHANT_webhooksGetHandle *wgh)
+{
+  unsigned int ies_len = json_array_size (ia);
+  struct TALER_MERCHANT_WebhookEntry ies[ies_len];
+  size_t index;
+  json_t *value;
+  int ret;
+
+  ret = GNUNET_OK;
+  json_array_foreach (ia, index, value) {
+    struct TALER_MERCHANT_WebhookEntry *ie = &ies[index];
+    struct GNUNET_JSON_Specification spec[] = {
+      GNUNET_JSON_spec_string ("webhook_id",
+                               &ie->webhook_id),
+      GNUNET_JSON_spec_end ()
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_JSON_parse (value,
+                           spec,
+                           NULL, NULL))
+    {
+      GNUNET_break_op (0);
+      ret = GNUNET_SYSERR;
+      continue;
+    }
+    if (GNUNET_SYSERR == ret)
+      break;
+  }
+  if (GNUNET_OK == ret)
+  {
+    struct TALER_MERCHANT_HttpResponse hr = {
+      .http_status = MHD_HTTP_OK
+    };
+
+    wgh->cb (tgh->cb_cls,
+             &hr,
+             ies_len,
+             ies);
+    wgh->cb = NULL; /* just to be sure */
+  }
+  return ret;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /webhooks request.
+ *
+ * @param cls the `struct TALER_MERCHANT_WebhooksGetHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_get_webhooks_finished (void *cls,
+                              long response_code,
+                              const void *response)
+{
+  struct TALER_MERCHANT_WebhooksGetHandle *tgh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  wgh->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /webhooks response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_OK:
+    {
+      json_t *webhooks;
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_json ("webhooks",
+                               &webhooks),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_JSON_parse (json,
+                             spec,
+                             NULL, NULL))
+      {
+        hr.http_status = 0;
+        hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+      }
+      else
+      {
+        if ( (! json_is_array (webhooks)) ||
+             (GNUNET_OK ==
+              parse_templates (webhooks,
+                              wgh)) )
+        {
+          GNUNET_JSON_parse_free (spec);
+          TALER_MERCHANT_webhooks_get_cancel (wgh);
+          return;
+        }
+        else
+        {
+          hr.http_status = 0;
+          hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+        }
+      }
+      GNUNET_JSON_parse_free (spec);
+      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;
+  default:
+    /* unexpected response code */
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    break;
+  }
+  tgh->cb (wgh->cb_cls,
+           &hr,
+           0,
+           NULL);
+  TALER_MERCHANT_webhooks_get_cancel (wgh);
+}
+
+
+struct TALER_MERCHANT_WebhooksGetHandle *
+TALER_MERCHANT_webhooks_get (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  TALER_MERCHANT_WebhooksGetCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_WebhooksGetHandle *wgh;
+  CURL *eh;
+
+  wgh = GNUNET_new (struct TALER_MERCHANT_WebhooksGetHandle);
+  wgh->ctx = ctx;
+  wgh->cb = cb;
+  wgh->cb_cls = cb_cls;
+  wgh->url = TALER_url_join (backend_url,
+                             "private/webhooks",
+                             NULL);
+  if (NULL == wgh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (wgh);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              wgh->url);
+  eh = TALER_MERCHANT_curl_easy_get_ (wgh->url);
+  wgh->job = GNUNET_CURL_job_add (ctx,
+                                  eh,
+                                  &handle_get_webhooks_finished,
+                                  wgh);
+  return wgh;
+}
+
+
+void
+TALER_MERCHANT_webhooks_get_cancel (
+  struct TALER_MERCHANT_WebhooksGetHandle *wgh)
+{
+  if (NULL != wgh->job)
+    GNUNET_CURL_job_cancel (wgh->job);
+  GNUNET_free (wgh->url);
+  GNUNET_free (wgh);
+}