starting to separate out response generation API and parsing APIs

1 files changed, 146 insertions, 0 deletions

diff --git a/src/mint/taler-mint-httpd_responses.c b/src/mint/taler-mint-httpd_responses.c
new file mode 100644
index 000000000..8f886c3d9
--- /dev/null
+++ b/src/mint/taler-mint-httpd_responses.c
@@ -0,0 +1,146 @@
+/*
+  This file is part of TALER
+  (C) 2014 GNUnet e.V.
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero 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 Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file taler-mint-httpd_responses.c
+ * @brief API for generating the various replies of the mint; these
+ *        functions are called TALER_MINT_reply_ and they generate
+ *        and queue MHD response objects for a given connection.
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler-mint-httpd_responses.h"
+
+
+/**
+ * Send JSON object as response.  Decreases the reference count of the
+ * JSON object.
+ *
+ * @param connection the MHD connection
+ * @param json the json object
+ * @param response_code the http response code
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_json (struct MHD_Connection *connection,
+                       json_t *json,
+                       unsigned int response_code)
+{
+  struct MHD_Response *resp;
+  char *json_str;
+  int ret;
+
+  json_str = json_dumps (json, JSON_INDENT(2));
+  json_decref (json);
+  resp = MHD_create_response_from_buffer (strlen (json_str), json_str,
+                                          MHD_RESPMEM_MUST_FREE);
+  if (NULL == resp)
+    return MHD_NO;
+  (void) MHD_add_response_header (resp,
+                                  MHD_HTTP_HEADER_CONTENT_TYPE,
+                                  "application/json");
+  ret = MHD_queue_response (connection, response_code, resp);
+  MHD_destroy_response (resp);
+  return ret;
+}
+
+
+/**
+ * Function to call to handle the request by building a JSON
+ * reply from a format string and varargs.
+ *
+ * @param connection the MHD connection to handle
+ * @param response_code HTTP response code to use
+ * @param fmt format string for pack
+ * @param ... varargs
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_json_pack (struct MHD_Connection *connection,
+                            unsigned int response_code,
+                            const char *fmt,
+                            ...)
+{
+  json_t *json;
+  va_list argp;
+
+  va_start (argp, fmt);
+  json = json_vpack_ex (NULL, 0, fmt, argp);
+  va_end (argp);
+  if (NULL == json)
+    return MHD_NO;
+  return TALER_MINT_reply_json (connection,
+                                json,
+                                response_code);
+}
+
+
+/**
+ * Send a response indicating an invalid argument.
+ *
+ * @param connection the MHD connection to use
+ * @param param_name the parameter that is invalid
+ * @return a MHD result code
+ */
+int
+TALER_MINT_reply_arg_invalid (struct MHD_Connection *connection,
+                              const char *param_name)
+{
+  json_t *json;
+
+  json = json_pack ("{ s:s, s:s }",
+                    "error",
+                    "invalid parameter",
+                    "parameter",
+                    param_name);
+  return TALER_MINT_reply_json (connection,
+                                json,
+                                MHD_HTTP_BAD_REQUEST);
+}
+
+
+/**
+ * Send a response indicating a missing argument.
+ *
+ * @param connection the MHD connection to use
+ * @param param_name the parameter that is missing
+ * @return a MHD result code
+ */
+int
+TALER_MINT_reply_arg_missing (struct MHD_Connection *connection,
+                              const char *param_name)
+{
+  json_t *json;
+
+  json = json_pack ("{ s:s, s:s }",
+                    "error",
+                    "missing parameter",
+                    "parameter",
+                    param_name);
+  return TALER_MINT_reply_json (connection,
+                                json,
+                                MHD_HTTP_BAD_REQUEST);
+}
+
+
+
+
+
+
+
+/* end of taler-mint-httpd_responses.c */