[age restriction] progress 8/n

More work towards support for extensions and age restriction

- updated gana
- added handler for DB-Event
- added TEH_extensions_init() and _done()
- added global for age restriction
- added stub for post handler
- added SQL-table for extension metadata
- added enum type for extensions and other data structures

Also:
- fixed some warnings -Wmaybe-unitialized

1 files changed, 251 insertions, 0 deletions

diff --git a/src/lib/exchange_api_management_post_extensions.c b/src/lib/exchange_api_management_post_extensions.c
new file mode 100644
index 000000000..7f6349113
--- /dev/null
+++ b/src/lib/exchange_api_management_post_extensions.c
@@ -0,0 +1,251 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2015-2021 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_management_post_extensions.c
+ * @brief functions to handle the settings for extensions (p2p and age restriction)
+ * @author Özgür Kesim
+ */
+#include "platform.h"
+#include "taler_json_lib.h"
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_extensions.h"
+#include "taler_exchange_service.h"
+#include "taler_signatures.h"
+#include "taler_curl_lib.h"
+#include "taler_json_lib.h"
+
+
+/**
+ * @brief Handle for a POST /management/extensions request.
+ */
+struct TALER_EXCHANGE_ManagementPostExtensionsHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Minor context that holds body and headers.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_EXCHANGE_ManagementPostExtensionsCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Reference to the execution context.
+   */
+  struct GNUNET_CURL_Context *ctx;
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP POST /management/extensions request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_ManagementPostExtensionsHandle *`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_post_extensions_finished (void *cls,
+                                 long response_code,
+                                 const void *response)
+{
+  struct TALER_EXCHANGE_ManagementPostExtensionsHandle *ph = cls;
+  const json_t *json = response;
+  struct TALER_EXCHANGE_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  ph->job = NULL;
+  switch (response_code)
+  {
+  case MHD_HTTP_NO_CONTENT:
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  default:
+    /* unexpected response code */
+    GNUNET_break_op (0);
+    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 for exchange management post extensions\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    break;
+  }
+  if (NULL != ph->cb)
+  {
+    ph->cb (ph->cb_cls,
+            &hr);
+    ph->cb = NULL;
+  }
+  TALER_EXCHANGE_post_management_extensions_cancel (ph);
+}
+
+
+struct TALER_EXCHANGE_ManagementPostExtensionsHandle *
+TALER_EXCHANGE_management_post_extensions (
+  struct GNUNET_CURL_Context *ctx,
+  const char *url,
+  const struct TALER_EXCHANGE_ManagementPostExtensionsData *pkd,
+  TALER_EXCHANGE_ManagementPostKeysCallback cb,
+  void *cb_cls)
+{
+  struct TALER_EXCHANGE_ManagementPostExtensionsHandle *ph;
+  //  FIXME-oec: TODO!
+  CURL *eh = NULL;
+  json_t *body;
+  json_t *extensions = NULL;
+  json_t *extension_sigs = NULL;
+
+  ph = GNUNET_new (struct TALER_EXCHANGE_ManagementPostExtensionsHandle);
+  ph->cb = cb;
+  ph->cb_cls = cb_cls;
+  ph->ctx = ctx;
+  ph->url = TALER_url_join (url,
+                            "management/extensions",
+                            NULL);
+  if (NULL == ph->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (ph);
+    return NULL;
+  }
+  extensions = json_array ();
+  GNUNET_assert (NULL != extensions);
+  for (unsigned int i = 0; i<pkd->num_extensions; i++)
+  {
+    json_t *config;
+    const struct TALER_AgeMask *mask;
+    const struct TALER_Extension *ext
+      = &pkd->extensions[i];
+
+    switch (ext->type)
+    {
+    // TODO: case TALER_Extension_Peer2Peer
+    case TALER_Extension_AgeRestriction:
+      mask = (struct TALER_AgeMask *) (&ext->config);
+      config = GNUNET_JSON_PACK (GNUNET_JSON_pack_data_auto ("mask",
+                                                             &mask->mask));
+      GNUNET_assert (NULL != config);
+      break;
+    default:
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Extension not supported.\n");
+    }
+
+    GNUNET_assert (0 ==
+                   json_array_append_new (
+                     extensions,
+                     GNUNET_JSON_PACK (
+                       GNUNET_JSON_pack_data_auto ("extension",
+                                                   &ext->name),
+                       GNUNET_JSON_pack_data_auto ("config",
+                                                   config)
+                       )));
+  }
+  extension_sigs = json_array ();
+  GNUNET_assert (NULL != extension_sigs);
+  for (unsigned int i = 0; i<pkd->num_extensions; i++)
+  {
+    const struct TALER_MasterSignatureP *sks
+      = &pkd->extension_sigs[i];
+
+    GNUNET_assert (0 ==
+                   json_array_append_new (
+                     extension_sigs,
+                     GNUNET_JSON_PACK (
+                       GNUNET_JSON_pack_data_auto ("extension_sig",
+                                                   &sks->eddsa_signature))));
+  }
+  body = GNUNET_JSON_PACK (
+    GNUNET_JSON_pack_array_steal ("extensions",
+                                  extensions),
+    GNUNET_JSON_pack_array_steal ("extension_sigs",
+                                  extension_sigs));
+  eh = curl_easy_init ();
+  GNUNET_assert (NULL != eh);
+  if (GNUNET_OK !=
+      TALER_curl_easy_post (&ph->post_ctx,
+                            eh,
+                            body))
+  {
+    GNUNET_break (0);
+    json_decref (body);
+    GNUNET_free (ph->url);
+    GNUNET_free (eh);
+    return NULL;
+  }
+  json_decref (body);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              ph->url);
+  GNUNET_assert (CURLE_OK == curl_easy_setopt (eh,
+                                               CURLOPT_URL,
+                                               ph->url));
+  ph->job = GNUNET_CURL_job_add2 (ctx,
+                                  eh,
+                                  ph->post_ctx.headers,
+                                  &handle_post_extensions_finished,
+                                  ph);
+  if (NULL == ph->job)
+  {
+    TALER_EXCHANGE_post_management_extensions_cancel (ph);
+    return NULL;
+  }
+  return ph;
+}
+
+
+void
+TALER_EXCHANGE_post_management_extensions_cancel (
+  struct TALER_EXCHANGE_ManagementPostExtensionsHandle *ph)
+{
+  if (NULL != ph->job)
+  {
+    GNUNET_CURL_job_cancel (ph->job);
+    ph->job = NULL;
+  }
+  TALER_curl_easy_post_finished (&ph->post_ctx);
+  GNUNET_free (ph->url);
+  GNUNET_free (ph);
+}