http: create function to get curl allowed protocols

Move the creation of an allowed protocols whitelist to a helper
function. This will be useful when we need to compute the set of
allowed protocols differently for normal and redirect cases.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http.c

@@ -489,10 +489,25 @@ static void set_curl_keepalive(CURL *c)
 }
 #endif
 
+static long get_curl_allowed_protocols(void)
+{
+	long allowed_protocols = 0;
+
+	if (is_transport_allowed("http"))
+		allowed_protocols |= CURLPROTO_HTTP;
+	if (is_transport_allowed("https"))
+		allowed_protocols |= CURLPROTO_HTTPS;
+	if (is_transport_allowed("ftp"))
+		allowed_protocols |= CURLPROTO_FTP;
+	if (is_transport_allowed("ftps"))
+		allowed_protocols |= CURLPROTO_FTPS;
+
+	return allowed_protocols;
+}
+
 static CURL *get_curl_handle(void)
 {
 	CURL *result = curl_easy_init();
-	long allowed_protocols = 0;
 
 	if (!result)
 		die("curl_easy_init failed");
@@ -572,16 +587,10 @@ static CURL *get_curl_handle(void)
 	curl_easy_setopt(result, CURLOPT_POST301, 1);
 #endif
 #if LIBCURL_VERSION_NUM >= 0x071304
-	if (is_transport_allowed("http"))
-		allowed_protocols |= CURLPROTO_HTTP;
-	if (is_transport_allowed("https"))
-		allowed_protocols |= CURLPROTO_HTTPS;
-	if (is_transport_allowed("ftp"))
-		allowed_protocols |= CURLPROTO_FTP;
-	if (is_transport_allowed("ftps"))
-		allowed_protocols |= CURLPROTO_FTPS;
-	curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
-	curl_easy_setopt(result, CURLOPT_PROTOCOLS, allowed_protocols);
+	curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
+			 get_curl_allowed_protocols());
+	curl_easy_setopt(result, CURLOPT_PROTOCOLS,
+			 get_curl_allowed_protocols());
 #else
 	warning("protocol restrictions not applied to curl redirects because\n"
 		"your curl version is too old (>= 7.19.4)");