[taler-merchant] 01/02: improve drop.sql to avoid having to update it whenever new SQL revisions are added

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grothoff pushed a commit to branch master
in repository merchant.

commit 72062fbe3ecc401fe74613d88b44f1bbb005f69e
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sat Mar 9 21:03:18 2024 +0100

    improve drop.sql to avoid having to update it whenever new SQL revisions 
are added
---
 src/backenddb/drop.sql                     |  16 +--
 src/lib/merchant_api_wallet_get_template.c | 195 +++++++++++++++++++++++++++++
 2 files changed, 203 insertions(+), 8 deletions(-)

diff --git a/src/backenddb/drop.sql b/src/backenddb/drop.sql
index 07a8ff12..9005b6ed 100644
--- a/src/backenddb/drop.sql
+++ b/src/backenddb/drop.sql
@@ -17,15 +17,15 @@
 -- Everything in one big transaction
 BEGIN;
 
--- This script DROPs all of the tables we create, including the
--- versioning schema!
---
--- Unlike the other SQL files, it SHOULD be updated to reflect the
--- latest requirements for dropping tables.
+-- This script DROPs all of the tables we create.
 
-SELECT _v.unregister_patch('merchant-0001');
-SELECT _v.unregister_patch('merchant-0002');
-SELECT _v.unregister_patch('merchant-0003');
+WITH xpatches AS (
+  SELECT patch_name
+  FROM _v.patches
+  WHERE starts_with(patch_name,'merchant-')
+)
+  SELECT _v.unregister_patch(xpatches.patch_name)
+  FROM xpatches;
 
 
 DROP SCHEMA merchant CASCADE;
diff --git a/src/lib/merchant_api_wallet_get_template.c 
b/src/lib/merchant_api_wallet_get_template.c
new file mode 100644
index 00000000..d9ca95bc
--- /dev/null
+++ b/src/lib/merchant_api_wallet_get_template.c
@@ -0,0 +1,195 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2022 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_wallet_get_template.c
+ * @brief Implementation of the GET /templates/$ID request of the merchant's 
HTTP API
+ * @author Priscilla HUANG
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_merchant_service.h"
+#include "merchant_api_curl_defaults.h"
+#include <taler/taler_json_lib.h>
+#include <taler/taler_signatures.h>
+
+
+/**
+ * Handle for a GET /templates/$ID operation.
+ */
+struct TALER_MERCHANT_WalletTemplateGetHandle
+{
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_MERCHANT_WalletTemplateGetCallback 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 GET /templates/$ID request.
+ *
+ * @param cls the `struct TALER_MERCHANT_TemplateGetHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
+ */
+static void
+handle_get_template_finished (void *cls,
+                              long response_code,
+                              const void *response)
+{
+  struct TALER_MERCHANT_WalletTemplateGetHandle *tgh = cls;
+  const json_t *json = response;
+  struct TALER_MERCHANT_WalletTemplateGetResponse tgr = {
+    .hr.http_status = (unsigned int) response_code,
+    .hr.reply = json
+  };
+
+  tgh->job = NULL;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got /templates/$ID response with status code %u\n",
+              (unsigned int) response_code);
+  switch (response_code)
+  {
+  case MHD_HTTP_OK:
+    {
+      const json_t *contract;
+      struct GNUNET_JSON_Specification spec[] = {
+        GNUNET_JSON_spec_object_const ("template_contract",
+                                       &contract),
+        GNUNET_JSON_spec_end ()
+      };
+
+      if (GNUNET_OK ==
+          GNUNET_JSON_parse (json,
+                             spec,
+                             NULL, NULL))
+      {
+        tgr.details.ok.template_contract = contract;
+        tgh->cb (tgh->cb_cls,
+                 &tgr);
+        TALER_MERCHANT_wallet_template_get_cancel (tgh);
+        return;
+      }
+      tgr.hr.http_status = 0;
+      tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+      break;
+    }
+  case MHD_HTTP_UNAUTHORIZED:
+    tgr.hr.ec = TALER_JSON_get_error_code (json);
+    tgr.hr.hint = TALER_JSON_get_error_hint (json);
+    /* Nothing really to verify, merchant says we need to authenticate. */
+    break;
+  case MHD_HTTP_NOT_FOUND:
+    tgr.hr.ec = TALER_JSON_get_error_code (json);
+    tgr.hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  default:
+    /* unexpected response code */
+    tgr.hr.ec = TALER_JSON_get_error_code (json);
+    tgr.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) tgr.hr.ec);
+    break;
+  }
+  tgh->cb (tgh->cb_cls,
+           &tgr);
+  TALER_MERCHANT_wallet_template_get_cancel (tgh);
+}
+
+
+struct TALER_MERCHANT_WalletTemplateGetHandle *
+TALER_MERCHANT_wallet_template_get (
+  struct GNUNET_CURL_Context *ctx,
+  const char *backend_url,
+  const char *template_id,
+  TALER_MERCHANT_WalletTemplateGetCallback cb,
+  void *cb_cls)
+{
+  struct TALER_MERCHANT_WalletTemplateGetHandle *tgh;
+  CURL *eh;
+
+  tgh = GNUNET_new (struct TALER_MERCHANT_WalletTemplateGetHandle);
+  tgh->ctx = ctx;
+  tgh->cb = cb;
+  tgh->cb_cls = cb_cls;
+  {
+    char *path;
+
+    GNUNET_asprintf (&path,
+                     "templates/%s",
+                     template_id);
+    tgh->url = TALER_url_join (backend_url,
+                               path,
+                               NULL);
+    GNUNET_free (path);
+  }
+  if (NULL == tgh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (tgh);
+    return NULL;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              tgh->url);
+  eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
+  tgh->job = GNUNET_CURL_job_add (ctx,
+                                  eh,
+                                  &handle_get_template_finished,
+                                  tgh);
+  return tgh;
+}
+
+
+void
+TALER_MERCHANT_wallet_template_get_cancel (
+  struct TALER_MERCHANT_WalletTemplateGetHandle *tgh)
+{
+  if (NULL != tgh->job)
+    GNUNET_CURL_job_cancel (tgh->job);
+  GNUNET_free (tgh->url);
+  GNUNET_free (tgh);
+}

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