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#include "response.h"
#include "file.h"
#include <boost/algorithm/string/predicate.hpp>
#include <functional>
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std::placeholders;
namespace {
class RequestContext
{
private:
request_type& m_req;
std::string m_host;
std::string m_target;
Server& m_server;
const Path& m_path;
public:
RequestContext(request_type& req, Server& server)
: m_req(req)
, m_host(req["host"])
, m_target(req.target())
, m_server(server)
, m_path(server.GetConfig().GetPath(server.GetSocket(), m_host, m_target))
{
}
const Path& GetPath() const {return m_path;}
std::string GetPluginName() const {return m_path.params.at("plugin");} // can throw std::out_of_range
std::string GetPluginPath() const {return m_path.requested;}
std::string GetDocRoot() const {return m_path.params.at("target");} // can throw std::out_of_range
std::string GetRelativePath() const { // can throw std::runtime_error
if (!boost::starts_with(m_target, m_path.requested))
throw std::runtime_error("Mismatch of target ("s + m_target + ") and plugin path(" + m_path.requested + ")"s);
return m_target.substr(m_path.requested.size());
}
std::string GetPluginParam(const std::string& key) const {return m_path.params.at(key);} // can throw std::out_of_range
plugin_type GetPlugin() const {return m_server.GetPlugin(m_path.params.at("plugin"));}; // can throw std::out_of_range
request_type& GetReq() const {return m_req;}
std::string GetTarget() const {return m_target;}
};
std::string extend_index_html(std::string path)
{
if (path.size() && path.back() == '/')
path.append("index.html");
return path;
}
std::string GetServerParam(const std::string& key, Server& server)
{
// following are the supported fields:
// ...
throw std::runtime_error("Unsupported server param: "s + key);
}
std::unordered_map<std::string, std::function<std::string(RequestContext&)>> GetRequestParamFunctions{
// following are the supported fields:
{"target", [](RequestContext& req_ctx) {return req_ctx.GetTarget();}},
{"rel_target", [](RequestContext& req_ctx) {return req_ctx.GetRelativePath();}},
{"doc_root", [](RequestContext& req_ctx) { return req_ctx.GetDocRoot();}},
{"body", [](RequestContext& req_ctx) { return req_ctx.GetReq().body(); }},
{"content_length", [](RequestContext& req_ctx) { return std::to_string(req_ctx.GetReq().body().size()); }},
{"method", [](RequestContext& req_ctx) { return std::string{req_ctx.GetReq().method_string()};}},
};
std::string GetRequestParam(const std::string& key, RequestContext& req_ctx)
{
// first, look up functions from GetRequestParamFunctions
{
auto it = GetRequestParamFunctions.find(key);
if (it != GetRequestParamFunctions.end())
return it->second(req_ctx);
}
// second, look up plugin parameters
{
try {
return req_ctx.GetPluginParam(key);
} catch(const std::out_of_range& ex) {
// not found
};
}
// third, look up req parameters
// contains: host
{
try {
return std::string{req_ctx.GetReq()[key]};
} catch(...) {
// not found
}
}
// otherwise: error
throw std::runtime_error("Unsupported request param: "s + key);
}
void SetResponseHeader(const std::string& key, const std::string& value, response_type& res)
{
// following are the supported fields:
if (key == "status") { // HTTP Status, e.g. "200" (OK)
res.result(unsigned(stoul(value)));
} else if (key == "server") { // Server name/version string
res.set(http::field::server, value);
} else if (key == "content_type") { // e.g. text/html
res.set(http::field::content_type, value);
} else
throw std::runtime_error("Unsupported response field: "s + key);
}
// Return a reasonable mime type based on the extension of a file.
beast::string_view
mime_type(beast::string_view path)
{
using beast::iequals;
auto const ext = [&path]
{
auto const pos = path.rfind(".");
if (pos == beast::string_view::npos)
return beast::string_view{};
return path.substr(pos);
}();
if(iequals(ext, ".htm")) return "text/html";
if(iequals(ext, ".html")) return "text/html";
if(iequals(ext, ".php")) return "text/html";
if(iequals(ext, ".css")) return "text/css";
if(iequals(ext, ".txt")) return "text/plain";
if(iequals(ext, ".js")) return "application/javascript";
if(iequals(ext, ".json")) return "application/json";
if(iequals(ext, ".xml")) return "application/xml";
if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
if(iequals(ext, ".flv")) return "video/x-flv";
if(iequals(ext, ".png")) return "image/png";
if(iequals(ext, ".jpe")) return "image/jpeg";
if(iequals(ext, ".jpeg")) return "image/jpeg";
if(iequals(ext, ".jpg")) return "image/jpeg";
if(iequals(ext, ".gif")) return "image/gif";
if(iequals(ext, ".bmp")) return "image/bmp";
if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
if(iequals(ext, ".tiff")) return "image/tiff";
if(iequals(ext, ".tif")) return "image/tiff";
if(iequals(ext, ".svg")) return "image/svg+xml";
if(iequals(ext, ".svgz")) return "image/svg+xml";
return "application/text";
}
// Used to return errors by generating response page and HTTP status code
response_type HttpStatus(std::string status, std::string message, response_type& res)
{
res.result(unsigned(stoul(status)));
res.set(http::field::content_type, "text/html");
res.body() = "<html><body><h1>"s + VersionString + " Error</h1><p>"s + status + " "s + message + "</p></body></html>"s;
res.prepare_payload();
return res;
}
} // anonymous namespace
response_type generate_response(request_type& req, Server& server)
{
response_type res{http::status::ok, req.version()};
res.set(http::field::server, VersionString);
res.set(http::field::content_type, mime_type(extend_index_html(std::string(req.target()))));
res.keep_alive(req.keep_alive());
try {
RequestContext req_ctx{req, server}; // can throw std::out_of_range
plugin_type plugin{req_ctx.GetPlugin()};
auto GetServerParamFunction {std::function<std::string(const std::string& key)>(std::bind(GetServerParam, _1, std::ref(server)))};
auto GetRequestParamFunction {std::function<std::string(const std::string& key)>(std::bind(GetRequestParam, _1, std::ref(req_ctx)))};
auto SetResponseHeaderFunction{std::function<void(const std::string& key, const std::string& value)>(std::bind(SetResponseHeader, _1, _2, std::ref(res)))};
std::string res_data { plugin->generate_page(GetServerParamFunction, GetRequestParamFunction, SetResponseHeaderFunction)};
if (req.method() == http::verb::head) {
res.content_length(res_data.size());
} else {
res.body() = res_data;
res.prepare_payload();
}
return res;
} catch(const std::out_of_range& ex) {
return HttpStatus("400", "Bad request: Host "s + std::string{req["host"]} + ":"s + std::string{req.target()} + " unknown"s, res);
} catch(const std::exception& ex) {
return HttpStatus("400", "Bad request: "s + std::string{ex.what()}, res);
}
}
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