[taler-exchange] branch master updated: revoke denomination client logic

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new 1ab3f7a9 revoke denomination client logic
1ab3f7a9 is described below

commit 1ab3f7a90bf58940fdc2abeda7823c080f1574da
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Wed Nov 25 21:43:52 2020 +0100

    revoke denomination client logic
---
 src/lib/Makefile.am                                |   1 +
 ...change_api_management_revoke_denomination_key.c | 145 +++++++++++++++++++--
 2 files changed, 132 insertions(+), 14 deletions(-)

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index f7ba5fd3..bf90c8f7 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -31,6 +31,7 @@ libtalerexchange_la_SOURCES = \
   exchange_api_management_auditor_enable.c \
   exchange_api_management_wire_disable.c \
   exchange_api_management_wire_enable.c \
+  exchange_api_management_revoke_denomination_key.c \
   exchange_api_management_revoke_signing_key.c \
   exchange_api_melt.c \
   exchange_api_recoup.c \
diff --git a/src/lib/exchange_api_management_revoke_denomination_key.c 
b/src/lib/exchange_api_management_revoke_denomination_key.c
index 8a7404e5..fa296203 100644
--- a/src/lib/exchange_api_management_revoke_denomination_key.c
+++ b/src/lib/exchange_api_management_revoke_denomination_key.c
@@ -24,6 +24,8 @@
 #include <gnunet/gnunet_curl_lib.h>
 #include "taler_exchange_service.h"
 #include "taler_signatures.h"
+#include "taler_curl_lib.h"
+#include "taler_json_lib.h"
 
 
 /**
@@ -37,6 +39,11 @@ struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle
    */
   char *url;
 
+  /**
+   * Minor context that holds body and headers.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+
   /**
    * Handle for the request.
    */
@@ -60,16 +67,55 @@ struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle
 
 
 /**
- * Inform the exchange that a denomination key was revoked.
+ * Function called when we're done processing the
+ * HTTP /management/denominations/$H_DENOM_PUB/revoke request.
  *
- * @param ctx the context
- * @param url HTTP base URL for the exchange
- * @param h_denom_pub hash of the denomination public key that was revoked
- * @param master_sig signature affirming the revocation
- * @param cb function to call with the exchange's result
- * @param cb_cls closure for @a cb
- * @return the request handle; NULL upon error
+ * @param cls the `struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle 
*`
+ * @param response_code HTTP response code, 0 on error
+ * @param response response body, NULL if not in JSON
  */
+static void
+handle_revoke_denomination_finished (void *cls,
+                                     long response_code,
+                                     const void *response)
+{
+  struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh = cls;
+  const json_t *json = response;
+  struct TALER_EXCHANGE_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  rh->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;
+  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\n",
+                (unsigned int) response_code,
+                (int) hr.ec);
+    break;
+  }
+  if (NULL != rh->cb)
+  {
+    rh->cb (rh->cb_cls,
+            &hr);
+    rh->cb = NULL;
+  }
+  TALER_EXCHANGE_management_revoke_denomination_key_cancel (rh);
+}
+
+
 struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *
 TALER_EXCHANGE_management_revoke_denomination_key (
   struct GNUNET_CURL_Context *ctx,
@@ -77,14 +123,84 @@ TALER_EXCHANGE_management_revoke_denomination_key (
   const struct GNUNET_HashCode *h_denom_pub,
   const struct TALER_MasterSignatureP *master_sig,
   TALER_EXCHANGE_ManagementRevokeDenominationKeyCallback cb,
-  void *cb_cls);
+  void *cb_cls)
+{
+  struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh;
+  CURL *eh;
+  json_t *body;
+
+  rh = GNUNET_new (struct 
TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle);
+  rh->cb = cb;
+  rh->cb_cls = cb_cls;
+  rh->ctx = ctx;
+  {
+    char epub_str[sizeof (*h_denom_pub) * 2];
+    char arg_str[sizeof (epub_str) + 64];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (h_denom_pub,
+                                         sizeof (*h_denom_pub),
+                                         epub_str,
+                                         sizeof (epub_str));
+    *end = '\0';
+    GNUNET_snprintf (arg_str,
+                     sizeof (arg_str),
+                     "management/denominations/%s/revoke",
+                     epub_str);
+    rh->url = TALER_url_join (url,
+                              arg_str,
+                              NULL);
+  }
+  if (NULL == rh->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (rh);
+    return NULL;
+  }
+  body = json_pack ("{s:o}",
+                    "master_sig",
+                    GNUNET_JSON_from_data_auto (master_sig));
+  if (NULL == body)
+  {
+    GNUNET_break (0);
+    GNUNET_free (rh->url);
+    GNUNET_free (rh);
+    return NULL;
+  }
+  eh = curl_easy_init ();
+  if (GNUNET_OK !=
+      TALER_curl_easy_post (&rh->post_ctx,
+                            eh,
+                            body))
+  {
+    GNUNET_break (0);
+    json_decref (body);
+    GNUNET_free (rh->url);
+    GNUNET_free (eh);
+    return NULL;
+  }
+  json_decref (body);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              rh->url);
+  GNUNET_assert (CURLE_OK == curl_easy_setopt (eh,
+                                               CURLOPT_URL,
+                                               rh->url));
+  rh->job = GNUNET_CURL_job_add2 (ctx,
+                                  eh,
+                                  rh->post_ctx.headers,
+                                  &handle_revoke_denomination_finished,
+                                  rh);
+  if (NULL == rh->job)
+  {
+    TALER_EXCHANGE_management_revoke_denomination_key_cancel (rh);
+    return NULL;
+  }
+  return rh;
+}
 
 
-/**
- * Cancel #TALER_EXCHANGE_management_revoke_denomination_key() operation.
- *
- * @param rh handle of the operation to cancel
- */
 void
 TALER_EXCHANGE_management_revoke_denomination_key_cancel (
   struct TALER_EXCHANGE_ManagementRevokeDenominationKeyHandle *rh)
@@ -94,6 +210,7 @@ TALER_EXCHANGE_management_revoke_denomination_key_cancel (
     GNUNET_CURL_job_cancel (rh->job);
     rh->job = NULL;
   }
+  TALER_curl_easy_post_finished (&rh->post_ctx);
   GNUNET_free (rh->url);
   GNUNET_free (rh);
 }

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