From c31048b05020420d1bb3a5cdf1c054648f11c214 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Fri, 1 May 2020 19:41:14 +0200
Subject: implement #6181

---
 src/exchange/taler-exchange-httpd.c | 51 ++++++++++++++++++++++++++++++++++---
 1 file changed, 48 insertions(+), 3 deletions(-)

(limited to 'src/exchange')

diff --git a/src/exchange/taler-exchange-httpd.c b/src/exchange/taler-exchange-httpd.c
index a8e29d300..00932c0f0 100644
--- a/src/exchange/taler-exchange-httpd.c
+++ b/src/exchange/taler-exchange-httpd.c
@@ -420,6 +420,45 @@ proceed_with_handler (const struct TEH_RequestHandler *rh,
 }
 
 
+/**
+ * Handle a "/seed" request.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param args array of additional options (must be empty for this function)
+ * @return MHD result code
+ */
+static MHD_RESULT
+handler_seed (const struct TEH_RequestHandler *rh,
+              struct MHD_Connection *connection,
+              const char *const args[])
+{
+#define SEED_SIZE 32
+  char *body;
+  MHD_RESULT ret;
+  struct MHD_Response *resp;
+
+  (void) rh;
+  body = malloc (SEED_SIZE); /* must use malloc(), because MHD will use free() */
+  if (NULL == body)
+    return MHD_NO;
+  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
+                              body,
+                              SEED_SIZE);
+  resp = MHD_create_response_from_buffer (SEED_SIZE,
+                                          body,
+                                          MHD_RESPMEM_MUST_FREE);
+  TALER_MHD_add_global_headers (resp);
+  ret = MHD_queue_response (connection,
+                            MHD_HTTP_OK,
+                            resp);
+  GNUNET_break (MHD_YES == ret);
+  MHD_destroy_response (resp);
+  return ret;
+#undef SEED_SIZE
+}
+
+
 /**
  * Handle incoming HTTP request.
  *
@@ -472,6 +511,11 @@ handle_mhd_request (void *cls,
       .method = MHD_HTTP_METHOD_GET,
       .handler.get = &TEH_handler_agpl_redirect
     },
+    {
+      .url = "seed",
+      .method = MHD_HTTP_METHOD_GET,
+      .handler.get = &handler_seed
+    },
     /* Terms of service */
     {
       .url = "terms",
@@ -654,9 +698,10 @@ handle_mhd_request (void *cls,
     {
       struct TEH_RequestHandler *rh = &handlers[i];
 
-      if (0 != strncmp (tok,
-                        rh->url,
-                        tok_size))
+      if ( (0 != strncmp (tok,
+                          rh->url,
+                          tok_size)) ||
+           (tok_size != strlen (rh->url) ) )
         continue;
       found = GNUNET_YES;
       /* The URL is a match!  What we now do depends on the method. */
-- 
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