[tarantool-patches] [PATCH] http: add CURLOPT_ACCEPT_ENCODING option

[Ilya Kosarev <i.kosarev@tarantool.org>]

CURLOPT_ACCEPT_ENCODING option is now supported.
This option enables automatic decompression of HTTP downloads.
See https://curl.haxx.se/libcurl/c/CURLOPT_ACCEPT_ENCODING.html

Closes #4232
---
Branch: https://github.com/tarantool/tarantool/tree/i.kosarev/gh-4232-curlopt-accept-encoding
Issue: https://github.com/tarantool/tarantool/issues/4232

 src/httpc.c       | 13 +++++++++++++
 src/httpc.h       | 12 ++++++++++++
 src/lua/httpc.c   |  5 +++++
 src/lua/httpc.lua |  2 ++
 4 files changed, 32 insertions(+)

diff --git a/src/httpc.c b/src/httpc.c
index 54bc785e1..736184b6b 100644
--- a/src/httpc.c
+++ b/src/httpc.c
@@ -337,6 +337,19 @@ httpc_set_follow_location(struct httpc_request *req, long follow)
 			 follow);
 }
 
+void
+httpc_set_accept_encoding(struct httpc_request *req, const char *encoding)
+{
+#if LIBCURL_VERSION_NUM >= 0x071506 /* CURLOPT_ACCEPT_ENCODING was called
+ 	CURLOPT_ENCODING before libcurl 7.21.6 */
+	curl_easy_setopt(req->curl_request.easy, CURLOPT_ACCEPT_ENCODING,
+			 encoding);
+#else
+	curl_easy_setopt(req->curl_request.easy, CURLOPT_ENCODING,
+			 encoding);
+#endif
+}
+
 int
 httpc_execute(struct httpc_request *req, double timeout)
 {
diff --git a/src/httpc.h b/src/httpc.h
index c6882a534..d5f4320c5 100644
--- a/src/httpc.h
+++ b/src/httpc.h
@@ -312,6 +312,18 @@ httpc_set_interface(struct httpc_request *req, const char *interface);
 void
 httpc_set_follow_location(struct httpc_request *req, long follow);
 
+/**
+ * Enable automatic decompression of HTTP downloads: set the contents
+ * of the Accept-Encoding: header sent in an HTTP request,
+ * and enable decoding of a response
+ * when a Content-Encoding: header is received.
+ * @param req request
+ * @param encoding - specify what encoding you'd like.
+ * @see https://curl.haxx.se/libcurl/c/CURLOPT_ACCEPT_ENCODING.html
+ */
+void
+httpc_set_accept_encoding(struct httpc_request *req, const char *encoding);
+
 /**
  * This function does async HTTP request
  * @param request - reference to request object with filled fields
diff --git a/src/lua/httpc.c b/src/lua/httpc.c
index e02adb9fb..a57f08c6c 100644
--- a/src/lua/httpc.c
+++ b/src/lua/httpc.c
@@ -295,6 +295,11 @@ luaT_httpc_request(lua_State *L)
 		httpc_set_follow_location(req, lua_toboolean(L, -1));
 	lua_pop(L, 1);
 
+	lua_getfield(L, 5, "accept_encoding");
+	if (!lua_isnil(L, -1))
+		httpc_set_accept_encoding(req, lua_tostring(L, -1));
+	lua_pop(L, 1);
+
 	if (httpc_execute(req, timeout) != 0) {
 		httpc_request_delete(req);
 		return luaT_error(L);
diff --git a/src/lua/httpc.lua b/src/lua/httpc.lua
index 50ff91a36..4b73187c2 100644
--- a/src/lua/httpc.lua
+++ b/src/lua/httpc.lua
@@ -287,6 +287,8 @@ end
 --          'Location' header that a server sends as part of an
 --          3xx response;
 --
+--      accept_encoding - enables automatic decompression of HTTP downloads;
+--
 --  Returns:
 --      {
 --          status=NUMBER,
-- 
2.17.1