From 0996656eccceccccc4eea7ec74bfe60559ee2fff Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 16 Sep 2016 01:39:04 +0200
Subject: [PATCH] Allow to query HTTP headers

---
 gtk2_ardour/ardour_http.cc | 18 ++++++++++++++++++
 gtk2_ardour/ardour_http.h  |  8 ++++++++
 2 files changed, 26 insertions(+)

diff --git a/gtk2_ardour/ardour_http.cc b/gtk2_ardour/ardour_http.cc
index 3ffea61b33..ba028d6f00 100644
--- a/gtk2_ardour/ardour_http.cc
+++ b/gtk2_ardour/ardour_http.cc
@@ -105,6 +105,22 @@ WriteMemoryCallback (void *ptr, size_t size, size_t nmemb, void *data) {
 	return realsize;
 }
 
+static size_t headerCallback (char* ptr, size_t size, size_t nmemb, void* data)
+{
+	size_t realsize = size * nmemb;
+	struct HttpGet::HeaderInfo *nfo = (struct HttpGet::HeaderInfo*)data;
+	std::string header (static_cast<const char*>(ptr), realsize);
+	std::string::size_type index = header.find (':', 0);
+	if (index != std::string::npos) {
+		std::string k = header.substr (0, index);
+		std::string v = header.substr (index + 2);
+		k.erase(k.find_last_not_of (" \n\r\t")+1);
+		v.erase(v.find_last_not_of (" \n\r\t")+1);
+		nfo->h[k] = v;
+	}
+
+	return realsize;
+}
 
 HttpGet::HttpGet (bool p, bool ssl)
 	: persist (p)
@@ -116,6 +132,8 @@ HttpGet::HttpGet (bool p, bool ssl)
 
 	curl_easy_setopt (_curl, CURLOPT_WRITEDATA, (void *)&mem);
 	curl_easy_setopt (_curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
+	curl_easy_setopt (_curl, CURLOPT_HEADERDATA, (void *)&nfo);
+	curl_easy_setopt (_curl, CURLOPT_HEADERFUNCTION, headerCallback);
 	curl_easy_setopt (_curl, CURLOPT_USERAGENT, PROGRAM_NAME VERSIONSTRING);
 	curl_easy_setopt (_curl, CURLOPT_TIMEOUT, ARDOUR_CURL_TIMEOUT);
 	curl_easy_setopt (_curl, CURLOPT_NOSIGNAL, 1);
diff --git a/gtk2_ardour/ardour_http.h b/gtk2_ardour/ardour_http.h
index 06cf46f408..aa6b9f3936 100644
--- a/gtk2_ardour/ardour_http.h
+++ b/gtk2_ardour/ardour_http.h
@@ -21,6 +21,7 @@
 
 #include <curl/curl.h>
 #include <string>
+#include <map>
 
 namespace ArdourCurl {
 
@@ -35,6 +36,10 @@ class HttpGet {
 		size_t size;
 	};
 
+	struct HeaderInfo {
+		std::map<std::string, std::string> h;
+	};
+
 	char* get (const char* url);
 
 	std::string get (const std::string& url) {
@@ -47,6 +52,8 @@ class HttpGet {
 
 	long int status () const { return _status; }
 
+	std::map<std::string, std::string> header () const { return nfo.h; }
+
 	char* escape (const char* s, int l) const {
 		return curl_easy_escape (_curl, s, l);
 	}
@@ -76,6 +83,7 @@ class HttpGet {
 	char error_buffer[CURL_ERROR_SIZE];
 
 	struct MemStruct mem;
+	struct HeaderInfo nfo;
 
 	static const char* ca_path;
 	static const char* ca_info;