jyapayne/Simple-Web-Server
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Fixes to HTTP caching (#97)

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This commit is contained in:
eidheim 2016-12-28 10:54:59 +01:00
commit 30ef094b02
2 changed files with 54 additions and 74 deletions
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65
http_examples.cpp
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@ -1,8 +1,5 @@
#include "server_http.hpp"
#include "client_http.hpp"
#ifdef HAVE_OPENSSL
#include "crypto.hpp"
#endif
//Added for the json-example
#define BOOST_SPIRIT_THREADSAFE
@ -14,6 +11,9 @@
#include <boost/filesystem.hpp>
#include <vector>
#include <algorithm>
#ifdef HAVE_OPENSSL
#include "crypto.hpp"
#endif
using namespace std;
//Added for the json-example:
@ -22,10 +22,6 @@ using namespace boost::property_tree;
typedef SimpleWeb::Server<SimpleWeb::HTTP> HttpServer;
typedef SimpleWeb::Client<SimpleWeb::HTTP> HttpClient;
#ifdef HAVE_OPENSSL
std::string build_hash(const std::string full_file_name);
#endif
//Added for the default_resource example
void default_resource_send(const HttpServer &server, const shared_ptr<HttpServer::Response> &response,
const shared_ptr<ifstream> &ifs);
@ -115,7 +111,6 @@ int main() {
try {
auto web_root_path=boost::filesystem::canonical("web");
auto path=boost::filesystem::canonical(web_root_path/request->path);
std::string cache_ctrl = "";
//Check if path is within web_root_path
if(distance(web_root_path.begin(), web_root_path.end())>distance(path.begin(), path.end()) ||
!equal(web_root_path.begin(), web_root_path.end(), path.begin()))
@ -124,30 +119,40 @@ int main() {
path/="index.html";
if(!(boost::filesystem::exists(path) && boost::filesystem::is_regular_file(path)))
throw invalid_argument("file does not exist");
std::string cache_control, etag;
// Uncomment the following line to enable Cache-Control
// cache_control="Cache-Control: max-age=86400\r\n";
#ifdef HAVE_OPENSSL
//Support for HTTP Cache
std::string hash = build_hash(path.string());
auto it=request->header.find("If-None-Match");
if(it!=request->header.end()) {
if (it->second == "\""+hash+"\"") {
*response << "HTTP/1.1 304 Not Modified\r\nCache-Control: max-age=86400\r\nETag: \""+hash+"\"\r\n\r\n";
return;
}
}
cache_ctrl = "Cache-Control: max-age=86400\r\nETag: \""+hash+"\"\r\n";
// Uncomment the following lines to enable ETag
// {
// ifstream ifs(path.string(), ifstream::in | ios::binary);
// if(ifs) {
// auto hash=SimpleWeb::Crypto::to_hex_string(SimpleWeb::Crypto::md5(ifs));
// etag = "ETag: \""+hash+"\"\r\n";
// auto it=request->header.find("If-None-Match");
// if(it!=request->header.end()) {
// if(!it->second.empty() && it->second.compare(1, hash.size(), hash)==0) {
// *response << "HTTP/1.1 304 Not Modified\r\n" << cache_control << etag << "\r\n\r\n";
// return;
// }
// }
// }
// else
// throw invalid_argument("could not read file");
// }
#endif
auto ifs=make_shared<ifstream>();
ifs->open(path.string(), ifstream::in | ios::binary);
ifs->open(path.string(), ifstream::in | ios::binary | ios::ate);
if(*ifs) {
ifs->seekg(0, ios::end);
auto length=ifs->tellg();
ifs->seekg(0, ios::beg);
*response << "HTTP/1.1 200 OK\r\n" << cache_ctrl << "Content-Length: " << length << "\r\n\r\n";
*response << "HTTP/1.1 200 OK\r\n" << cache_control << etag << "Content-Length: " << length << "\r\n\r\n";
default_resource_send(server, response, ifs);
}
else
@ -201,17 +206,3 @@ void default_resource_send(const HttpServer &server, const shared_ptr<HttpServer
}
}
}
#ifdef HAVE_OPENSSL
std::string build_hash(const std::string full_file_name) {
std::string ret = "";
std::ifstream file(full_file_name, std::ios::binary | std::ios::ate);
std::streamsize size = file.tellg();
file.seekg(0, std::ios::beg);
std::vector<char> buffer(size);
if (!file.read(buffer.data(), size))
return ret;
ret = reinterpret_cast<char*> (&buffer[0]);
return SimpleWeb::Crypto::md5(ret,1);
}
#endif