1 files changed, 53 insertions, 1 deletions
diff --git a/src/twister/twister_api.c b/src/twister/twister_api.c
index 7087d62..8bb215b 100644
--- a/src/twister/twister_api.c
+++ b/src/twister/twister_api.c
@@ -380,7 +380,7 @@ TALER_TWISTER_flip_upload
     GNUNET_break (0);
     return NULL;
   }
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Will UL-flip: %s\n",
               path);
 
@@ -555,6 +555,58 @@ TALER_TWISTER_modify_path_ul (struct TALER_TWISTER_Handle *h,
   return op;
 }
 
+
+/**
+ * Change the HTTP response header of @a header to @a value.
+ *
+ * @param h twister instance to control
+ * @param header the HTTP response header to modify
+ * @param value value to use for @a header
+ * @param cb callback to call once twister gets this instruction.
+ * @param cb_cls closure for @a cb_callback
+ *
+ * @return operation handle.
+ */
+struct TALER_TWISTER_Operation *
+TALER_TWISTER_modify_header_dl (struct TALER_TWISTER_Handle *h,
+                                const char *header,
+                                const char *value,
+                                GNUNET_SCHEDULER_TaskCallback cb,
+                                void *cb_cls)
+{
+  struct TALER_TWISTER_Operation *op;
+  struct GNUNET_MQ_Envelope *env;
+  struct TWISTER_ModifyPath *src;
+  uint16_t stralloc;
+
+  stralloc = strlen (header) + strlen (value) + 2;
+  if (sizeof (*src) + stralloc > UINT16_MAX)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+  op = GNUNET_new (struct TALER_TWISTER_Operation);
+  op->h = h;
+  op->cb = cb;
+  op->cb_cls = cb_cls;
+  GNUNET_CONTAINER_DLL_insert_tail (h->op_head,
+                                    h->op_tail,
+                                    op);
+  env = GNUNET_MQ_msg_extra (src,
+                             stralloc,
+                             TWISTER_MESSAGE_TYPE_MODIFY_HEADER_DL);
+
+  GNUNET_assert
+    (stralloc == GNUNET_STRINGS_buffer_fill ((char *) &src[1],
+                                             stralloc,
+                                             2,
+                                             header,
+                                             value));
+  GNUNET_MQ_send (h->mq, env);
+  return op;
+}
+
+
 /**
  * Change the next response code to @a new_rc.
  *