pass static_url to templates

1 files changed, 75 insertions, 0 deletions

diff --git a/src/backend/taler-merchant-httpd_templating.c b/src/backend/taler-merchant-httpd_templating.c
index 393104dc..9d7766b9 100644
--- a/src/backend/taler-merchant-httpd_templating.c
+++ b/src/backend/taler-merchant-httpd_templating.c
@@ -107,6 +107,70 @@ lookup_template (struct MHD_Connection *connection,
   return best->value;
 }
 
+/**
+ * Get the base URL for static resources.
+ *
+ * @param con the MHD connection
+ * @param instance_id the instance ID
+ * @returns the static files base URL, guaranteed
+ *          to have a trailing slash.
+ */
+static char *
+make_static_url (struct MHD_Connection *con,
+                     const char *instance_id)
+{
+  const char *host;
+  const char *forwarded_host;
+  const char *uri_path;
+  struct GNUNET_Buffer buf = { 0 };
+
+  host = MHD_lookup_connection_value (con,
+                                      MHD_HEADER_KIND,
+                                      "Host");
+  forwarded_host = MHD_lookup_connection_value (con,
+                                                MHD_HEADER_KIND,
+                                                "X-Forwarded-Host");
+
+  uri_path = MHD_lookup_connection_value (con,
+                                          MHD_HEADER_KIND,
+                                          "X-Forwarded-Prefix");
+  if (NULL != forwarded_host)
+    host = forwarded_host;
+
+  if (NULL == host)
+  {
+    GNUNET_break (0);
+    return NULL;
+  }
+
+  GNUNET_assert (NULL != instance_id);
+
+  if (GNUNET_NO == TALER_mhd_is_https (con))
+    GNUNET_buffer_write_str (&buf,
+                             "http://");
+  else
+    GNUNET_buffer_write_str (&buf,
+                             "https://");
+  GNUNET_buffer_write_str (&buf,
+                           host);
+  if (NULL != uri_path)
+    GNUNET_buffer_write_path (&buf,
+                              uri_path);
+  if (0 != strcmp ("default",
+                   instance_id))
+  {
+    GNUNET_buffer_write_path (&buf,
+                              "instances");
+    GNUNET_buffer_write_path (&buf,
+                              instance_id);
+  }
+  GNUNET_buffer_write_path (&buf,
+                            "static/");
+  return GNUNET_buffer_reap_str (&buf);
+}
+
+
+
 
 /**
  * Load a @a template and substitute using @a root, returning
@@ -116,6 +180,7 @@ lookup_template (struct MHD_Connection *connection,
  * @param connection the connection we act upon
  * @param http_status code to use on success
  * @param template basename of the template to load
+ * @param instance_id instance ID, used to compute static files URL
  * @param taler_uri value for "Taler:" header to set, or NULL
  * @param root JSON object to pass as the root context
  * @return #GNUNET_OK on success (reply queued), #GNUNET_NO if an error was queued,
@@ -125,6 +190,7 @@ enum GNUNET_GenericReturnValue
 TMH_return_from_template (struct MHD_Connection *connection,
                           unsigned int http_status,
                           const char *template,
+                          const char *instance_id,
                           const char *taler_uri,
                           json_t *root)
 {
@@ -151,6 +217,15 @@ TMH_return_from_template (struct MHD_Connection *connection,
         return GNUNET_SYSERR;
       return GNUNET_NO;
     }
+    /* Add default values to the context */
+    {
+      char *static_url = make_static_url (connection,
+                                          instance_id);
+      json_object_set (root,
+                       "static_url",
+                       json_string (static_url));
+      GNUNET_free (static_url);
+    }
     if (0 !=
         (eno = mustach_jansson (tmpl,
                                 root,