Refactor extensions

- Extensions are now compiled as shared libraries and loaded at runtime
  according to the TALER configuration.

- So far, only age restriction is loaded as extension.

- Groundwork for extension auction_brandt started.

1 files changed, 56 insertions, 5 deletions

diff --git a/src/exchange/taler-exchange-httpd.c b/src/exchange/taler-exchange-httpd.c
index 496d3d29..d7651d79 100644
--- a/src/exchange/taler-exchange-httpd.c
+++ b/src/exchange/taler-exchange-httpd.c
@@ -98,6 +98,13 @@ static int allow_address_reuse;
 const struct GNUNET_CONFIGURATION_Handle *TEH_cfg;
 
 /**
+ * Configuration of age restriction
+ *
+ * Set after loading the library, enabled in database event handler.
+ */
+struct TALER_AgeRestrictionConfig TEH_age_restriction_config = {0};
+
+/**
  * Handle to the HTTP server.
  */
 static struct MHD_Daemon *mhd;
@@ -139,11 +146,6 @@ char *TEH_currency;
 char *TEH_base_url;
 
 /**
- * Age restriction flags and mask
- */
-bool TEH_age_restriction_enabled = true;
-
-/**
  * Default timeout in seconds for HTTP requests.
  */
 static unsigned int connection_timeout = 30;
@@ -170,6 +172,7 @@ bool TEH_suicide;
  * TALER_SIGNATURE_MASTER_EXTENSION.
  */
 struct TALER_MasterSignatureP TEH_extensions_sig;
+bool TEH_extensions_signed = false;
 
 /**
  * Value to return from main()
@@ -1039,6 +1042,46 @@ handle_post_auditors (struct TEH_RequestContext *rc,
 
 
 /**
+ * Handle POST "/extensions/..." requests.
+ *
+ * @param rc request context
+ * @param root uploaded JSON data
+ * @param args array of additional options
+ * @return MHD result code
+ */
+static MHD_RESULT
+handle_post_extensions (struct TEH_RequestContext *rc,
+                        const json_t *root,
+                        const char *const args[])
+{
+  const struct TALER_Extension *ext = NULL;
+
+  if (NULL == args[0])
+  {
+    GNUNET_break_op (0);
+    return r404 (rc->connection,
+                 "/extensions/$EXTENSION");
+  }
+
+  ext = TALER_extensions_get_by_name (args[0]);
+  if (NULL == ext)
+  {
+    GNUNET_break_op (0);
+    return r404 (rc->connection,
+                 "/extensions/$EXTENSION unknown");
+  }
+
+  if (NULL == ext->http_post_handler)
+    return MHD_HTTP_NOT_IMPLEMENTED;
+
+  return ext->http_post_handler (
+    rc->connection,
+    root,
+    &args[1]);
+}
+
+
+/**
  * Handle incoming HTTP request.
  *
  * @param cls closure for MHD daemon (unused)
@@ -1255,6 +1298,14 @@ handle_mhd_request (void *cls,
       .nargs = 4,
       .nargs_is_upper_bound = true
     },
+    /* extensions endpoints */
+    {
+      .url = "extensions",
+      .method = MHD_HTTP_METHOD_POST,
+      .handler.post = &handle_post_extensions,
+      .nargs = 4, /* Arbitrary upper bound */
+      .nargs_is_upper_bound = true,
+    },
     /* mark end of list */
     {
       .url = NULL