auditor add denomination client logic

src/lib/Makefile.am

@@ -21,6 +21,7 @@ libtalerexchange_la_LDFLAGS = \
   -version-info 4:0:0 \
   -no-undefined
 libtalerexchange_la_SOURCES = \
+  exchange_api_auditor_add_denomination.c \
   exchange_api_curl_defaults.c exchange_api_curl_defaults.h \
   exchange_api_common.c \
   exchange_api_handle.c exchange_api_handle.h \

src/lib/exchange_api_auditor_add_denomination.c

@@ -24,11 +24,10 @@
 #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"
 
 
-/**
- * @brief Handle for a POST /auditor/$AUDITOR_PUB/$H_DENOM_PUB request.
- */
 struct TALER_EXCHANGE_AuditorAddDenominationHandle
 {
 
@@ -37,6 +36,11 @@ struct TALER_EXCHANGE_AuditorAddDenominationHandle
    */
   char *url;
 
+  /**
+   * Minor context that holds body and headers.
+   */
+  struct TALER_CURL_PostContext post_ctx;
+
   /**
    * Handle for the request.
    */
@@ -60,17 +64,67 @@ struct TALER_EXCHANGE_AuditorAddDenominationHandle
 
 
 /**
- * Provide auditor signatures for a denomination to the exchange.
+ * Function called when we're done processing the
+ * HTTP POST /auditor/$AUDITOR_PUB/$H_DENOM_PUB request.
  *
- * @param ctx the context
+ * @param cls the `struct TALER_EXCHANGE_AuditorAddDenominationHandle *`
- * @param url HTTP base URL for the exchange
+ * @param response_code HTTP response code, 0 on error
- * @param h_denom_pub hash of the public key of the denomination
+ * @param response response body, NULL if not in JSON
- * @param auditor_pub public key of the auditor
- * @param auditor_sig signature of the auditor
- * @param cb function to call with the exchange's result
- * @param cb_cls closure for @a cb
- * @return the request handle; NULL upon error
  */
+static void
+handle_auditor_add_denomination_finished (void *cls,
+                                          long response_code,
+                                          const void *response)
+{
+  struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah = cls;
+  const json_t *json = response;
+  struct TALER_EXCHANGE_HttpResponse hr = {
+    .http_status = (unsigned int) response_code,
+    .reply = json
+  };
+
+  ah->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;
+  case MHD_HTTP_GONE:
+    hr.ec = TALER_JSON_get_error_code (json);
+    hr.hint = TALER_JSON_get_error_hint (json);
+    break;
+  case MHD_HTTP_PRECONDITION_FAILED:
+    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 != ah->cb)
+  {
+    ah->cb (ah->cb_cls,
+            &hr);
+    ah->cb = NULL;
+  }
+  TALER_EXCHANGE_add_auditor_denomination_cancel (ah);
+}
+
+
 struct TALER_EXCHANGE_AuditorAddDenominationHandle *
 TALER_EXCHANGE_add_auditor_denomination (
   struct GNUNET_CURL_Context *ctx,
@@ -79,14 +133,91 @@ TALER_EXCHANGE_add_auditor_denomination (
   const struct TALER_AuditorPublicKeyP *auditor_pub,
   const struct TALER_AuditorSignatureP *auditor_sig,
   TALER_EXCHANGE_AuditorAddDenominationCallback cb,
-  void *cb_cls);
+  void *cb_cls)
+{
+  struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah;
+  CURL *eh;
+  json_t *body;
+
+  ah = GNUNET_new (struct TALER_EXCHANGE_AuditorAddDenominationHandle);
+  ah->cb = cb;
+  ah->cb_cls = cb_cls;
+  ah->ctx = ctx;
+  {
+    char apub_str[sizeof (*auditor_pub) * 2];
+    char denom_str[sizeof (*h_denom_pub) * 2];
+    char arg_str[sizeof (apub_str) + sizeof (denom_str) + 32];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (auditor_pub,
+                                         sizeof (*auditor_pub),
+                                         apub_str,
+                                         sizeof (apub_str));
+    *end = '\0';
+    end = GNUNET_STRINGS_data_to_string (h_denom_pub,
+                                         sizeof (*h_denom_pub),
+                                         denom_str,
+                                         sizeof (denom_str));
+    *end = '\0';
+    GNUNET_snprintf (arg_str,
+                     sizeof (arg_str),
+                     "auditors/%s/%s",
+                     apub_str,
+                     denom_str);
+    ah->url = TALER_url_join (url,
+                              arg_str,
+                              NULL);
+  }
+  if (NULL == ah->url)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not construct request URL.\n");
+    GNUNET_free (ah);
+    return NULL;
+  }
+  body = json_pack ("{s:o}",
+                    "auditor_sig",
+                    GNUNET_JSON_from_data_auto (auditor_sig));
+  if (NULL == body)
+  {
+    GNUNET_break (0);
+    GNUNET_free (ah->url);
+    GNUNET_free (ah);
+    return NULL;
+  }
+  eh = curl_easy_init ();
+  if (GNUNET_OK !=
+      TALER_curl_easy_post (&ah->post_ctx,
+                            eh,
+                            body))
+  {
+    GNUNET_break (0);
+    json_decref (body);
+    GNUNET_free (ah->url);
+    GNUNET_free (eh);
+    return NULL;
+  }
+  json_decref (body);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Requesting URL '%s'\n",
+              ah->url);
+  GNUNET_assert (CURLE_OK == curl_easy_setopt (eh,
+                                               CURLOPT_URL,
+                                               ah->url));
+  ah->job = GNUNET_CURL_job_add2 (ctx,
+                                  eh,
+                                  ah->post_ctx.headers,
+                                  &handle_auditor_add_denomination_finished,
+                                  ah);
+  if (NULL == ah->job)
+  {
+    TALER_EXCHANGE_add_auditor_denomination_cancel (ah);
+    return NULL;
+  }
+  return ah;
+}
 
 
-/**
- * Cancel #TALER_EXCHANGE_add_auditor_denomination() operation.
- *
- * @param ah handle of the operation to cancel
- */
 void
 TALER_EXCHANGE_add_auditor_denomination_cancel (
   struct TALER_EXCHANGE_AuditorAddDenominationHandle *ah)
@@ -96,6 +227,7 @@ TALER_EXCHANGE_add_auditor_denomination_cancel (
     GNUNET_CURL_job_cancel (ah->job);
     ah->job = NULL;
   }
+  TALER_curl_easy_post_finished (&ah->post_ctx);
   GNUNET_free (ah->url);
   GNUNET_free (ah);
 }