[taler-merchant] 02/02: implement #6779 (still needs tests)

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grothoff pushed a commit to branch master
in repository merchant.

commit a7cc5eb7feda16ff48d3ca51514a1ae960bccd11
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Fri Apr 16 23:07:53 2021 +0200

    implement #6779 (still needs tests)
---
 src/lib/Makefile.am                        |   1 +
 src/lib/merchant_api_patch_instance_auth.c | 229 +++++++++++++++++++++++++++++
 2 files changed, 230 insertions(+)

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 57e40902..a06089b3 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -34,6 +34,7 @@ libtalermerchant_la_SOURCES = \
   merchant_api_patch_instance.c \
   merchant_api_patch_order_forget.c \
   merchant_api_patch_product.c \
+  merchant_api_patch_instance_auth.c \
   merchant_api_post_instances.c \
   merchant_api_post_orders.c \
   merchant_api_post_order_abort.c \
diff --git a/src/lib/merchant_api_patch_instance_auth.c 
b/src/lib/merchant_api_patch_instance_auth.c
new file mode 100644
index 00000000..d0bf56d1
--- /dev/null
+++ b/src/lib/merchant_api_patch_instance_auth.c
@@ -0,0 +1,229 @@
+/*
+  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_patch_instance_auth.c
+ * @brief Implementation of the PATCH /instance/$ID/private/auth request
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+#include <taler/taler_curl_lib.h>
+
+
+/**
+ * Handle for a PATCH /instances/$ID/private/auth operation.
+ */
+struct TALER_MERCHANT_InstanceAuthPatchHandle
+{
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_InstancePatchCallback 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 GET /instances/$ID/private/auth request.
+ *
+ * @param cls the `struct TALER_MERCHANT_InstanceAuthPatchHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_patch_instance_auth_finished (void *cls,
+                                     long response_code,
+                                     const void *response)
+{
+  struct TALER_MERCHANT_InstanceAuthPatchHandle *iaph = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  iaph->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /instances/$ID response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_NO_CONTENT:
+    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;
+  }
+  iaph->cb (iaph->cb_cls,
+            &hr);
+  TALER_MERCHANT_instance_auth_patch_cancel (iaph);
+}
+
+
+struct TALER_MERCHANT_InstanceAuthPatchHandle *
+TALER_MERCHANT_instance_auth_patch (
+                                    struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *instance_id,
+  const char *auth_token,
+  TALER_MERCHANT_InstancePatchCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_InstanceAuthPatchHandle *iaph;
+  json_t *req_obj;
+
+  iaph = GNUNET_new (struct TALER_MERCHANT_InstanceAuthPatchHandle);
+  iaph->ctx = ctx;
+  iaph->cb = cb;
+  iaph->cb_cls = cb_cls;
+  if (NULL != instance_id)
+  {
+    char *path;
+
+    GNUNET_asprintf (&path,
+                     "instances/%s/private/auth",
+                     instance_id);
+    iaph->url = TALER_url_join (backend_url,
+                               path,
+                               NULL);
+    GNUNET_free (path);
+  }
+  else
+  {
+    /* backend_url is already identifying the instance */
+    iaph->url = TALER_url_join (backend_url,
+                               "/private/auth",
+                               NULL);
+  }
+  if (NULL == iaph->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (iaph);
+    return NULL;
+  }
+  if (NULL == auth_token)
+  {
+    req_obj = json_pack ("{s:s}",
+                         "method",
+                         "external");
+  }
+  else
+  {
+    req_obj = json_pack ("{s:s, s:s}",
+                         "method",
+                         "token",
+                         "token",
+                         auth_token);
+  }
+  if (NULL == req_obj)
+  {
+    GNUNET_break (0);
+    GNUNET_free (iaph->url);
+    GNUNET_free (iaph);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              iaph->url);
+  {
+    CURL *eh;
+
+    eh = curl_easy_init ();
+    if (GNUNET_OK !=
+        TALER_curl_easy_post (&iaph->post_ctx,
+                              eh,
+                              req_obj))
+    {
+      GNUNET_break (0);
+      json_decref (req_obj);
+      GNUNET_free (iaph->url);
+      GNUNET_free (iaph);
+      return NULL;
+    }
+    json_decref (req_obj);
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_URL,
+                                     iaph->url));
+    GNUNET_assert (CURLE_OK ==
+                   curl_easy_setopt (eh,
+                                     CURLOPT_CUSTOMREQUEST,
+                                     MHD_HTTP_METHOD_POST)); // FIXME: PATCH?
+    iaph->job = GNUNET_CURL_job_add (ctx,
+                                     eh,
+                                     &handle_patch_instance_auth_finished,
+                                     iaph);
+  }
+  return iaph;
+}
+
+
+void
+TALER_MERCHANT_instance_auth_patch_cancel (
+  struct TALER_MERCHANT_InstanceAuthPatchHandle *iaph)
+{
+  if (NULL != iaph->job)
+    GNUNET_CURL_job_cancel (iaph->job);
+  TALER_curl_easy_post_finished (&iaph->post_ctx);
+  GNUNET_free (iaph->url);
+  GNUNET_free (iaph);
+}

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