Add Lua interface to HTTPFetchRequest

This allows mods to perform both asynchronous and synchronous HTTP
requests. Mods are only granted access to HTTP APIs if either mod
security is disabled or if they are whitelisted in any of the
the secure.http_mods and secure.trusted_mods settings.

Adds httpfetch_caller_alloc_secure to generate random, non-predictable
caller IDs so that lua mods cannot spy on each others HTTP queries.

1 files changed, 50 insertions, 0 deletions

diff --git a/src/script/lua_api/l_http.h b/src/script/lua_api/l_http.h
new file mode 100644
index 000000000..077ade691
--- /dev/null
+++ b/src/script/lua_api/l_http.h
@@ -0,0 +1,50 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef L_HTTP_H_
+#define L_HTTP_H_
+
+#include "lua_api/l_base.h"
+#include "config.h"
+
+struct HTTPFetchRequest;
+struct HTTPFetchResult;
+
+class ModApiHttp : public ModApiBase {
+private:
+#if USE_CURL
+	// Helpers for HTTP fetch functions
+	static void read_http_fetch_request(lua_State *L, HTTPFetchRequest &req);
+	static void push_http_fetch_result(lua_State *L, HTTPFetchResult &res, bool completed = true);
+
+	// http_fetch_async({url=, timeout=, post_data=})
+	static int l_http_fetch_async(lua_State *L);
+
+	// http_fetch_async_get(handle)
+	static int l_http_fetch_async_get(lua_State *L);
+
+	// request_http_api()
+	static int l_request_http_api(lua_State *L);
+#endif
+
+public:
+	static void Initialize(lua_State *L, int top);
+};
+
+#endif /* L_HTTP_H_ */