[taler-challenger] branch master updated: add cache control to /config endpoint

[gnunet]

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grothoff pushed a commit to branch master
in repository challenger.

The following commit(s) were added to refs/heads/master by this push:
     new f57b798  add cache control to /config endpoint
f57b798 is described below

commit f57b7984c77206f74fdd7b7ebb777c8a063c98d9
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sun Apr 21 10:26:38 2024 +0200

    add cache control to /config endpoint
---
 src/challenger/challenger-httpd_config.c | 53 ++++++++++++++++++++++++++------
 1 file changed, 44 insertions(+), 9 deletions(-)

diff --git a/src/challenger/challenger-httpd_config.c 
b/src/challenger/challenger-httpd_config.c
index fcbaf15..da6533f 100644
--- a/src/challenger/challenger-httpd_config.c
+++ b/src/challenger/challenger-httpd_config.c
@@ -36,17 +36,52 @@ CH_handler_config (struct CH_HandlerContext *hc,
                    const char *upload_data,
                    size_t *upload_data_size)
 {
+  static struct MHD_Response *response;
+  static struct GNUNET_TIME_Absolute a;
+
   (void) upload_data;
   (void) upload_data_size;
-  return TALER_MHD_REPLY_JSON_PACK (
-    hc->connection,
-    MHD_HTTP_OK,
-    GNUNET_JSON_pack_string ("implementation",
-                             "urn:net:taler:specs:challenger:c-reference"),
-    GNUNET_JSON_pack_string ("name",
-                             "challenger"),
-    GNUNET_JSON_pack_string ("version",
-                             "1:0:1"));
+  if ( (GNUNET_TIME_absolute_is_past (a)) &&
+       (NULL != response) )
+  {
+    MHD_destroy_response (response);
+    response = NULL;
+  }
+  if (NULL == response)
+  {
+    struct GNUNET_TIME_Timestamp km;
+    char dat[128];
+
+    a = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_DAYS);
+    /* Round up to next full day to ensure the expiration
+       time does not become a fingerprint! */
+    a = GNUNET_TIME_absolute_round_down (a,
+                                         GNUNET_TIME_UNIT_DAYS);
+    a = GNUNET_TIME_absolute_add (a,
+                                  GNUNET_TIME_UNIT_DAYS);
+    /* => /config response stays at most 48h in caches! */
+    km = GNUNET_TIME_absolute_to_timestamp (a);
+    TALER_MHD_get_date_string (km.abs_time,
+                               dat);
+    response = TALER_MHD_MAKE_JSON_PACK (
+      GNUNET_JSON_pack_string ("implementation",
+                               "urn:net:taler:specs:challenger:c-reference"),
+      GNUNET_JSON_pack_string ("name",
+                               "challenger"),
+      GNUNET_JSON_pack_string ("version",
+                               "1:1:1"));
+    GNUNET_break (MHD_YES ==
+                  MHD_add_response_header (response,
+                                           MHD_HTTP_HEADER_EXPIRES,
+                                           dat));
+    GNUNET_break (MHD_YES ==
+                  MHD_add_response_header (response,
+                                           MHD_HTTP_HEADER_CACHE_CONTROL,
+                                           "public,max-age=21600")); /* 6h */
+  }
+  return MHD_queue_response (hc->connection,
+                             MHD_HTTP_OK,
+                             response);
 }
 
 

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