From 917d4574153fa57ea43e7410006f58aa5b1bbb0b Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Sun, 5 Apr 2020 19:15:25 +0200
Subject: Separate out response handling

---
 response.cpp | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 response.cpp

(limited to 'response.cpp')

diff --git a/response.cpp b/response.cpp
new file mode 100644
index 0000000..78368f6
--- /dev/null
+++ b/response.cpp
@@ -0,0 +1,92 @@
+#include "response.h"
+#include "file.h"
+
+namespace {
+
+// Append an HTTP rel-path to a local filesystem path.
+// The returned path is normalized for the platform.
+std::string
+path_cat(
+    beast::string_view base,
+    beast::string_view path)
+{
+    if(base.empty())
+        return std::string(path);
+    std::string result(base);
+#ifdef BOOST_MSVC
+    char constexpr path_separator = '\\';
+    if(result.back() == path_separator)
+        result.resize(result.size() - 1);
+    result.append(path.data(), path.size());
+    for(auto& c : result)
+        if(c == '/')
+            c = path_separator;
+#else
+    char constexpr path_separator = '/';
+    if(result.back() == path_separator)
+        result.resize(result.size() - 1);
+    result.append(path.data(), path.size());
+#endif
+    return result;
+}
+
+}
+
+http_exception::http_exception(std::string message): m_message(message)
+{
+}
+
+const char* http_exception::what() const noexcept
+{
+ return m_message.data();
+}
+
+bad_request_exception::bad_request_exception(std::string message): http_exception(message)
+{
+}
+
+not_found_exception::not_found_exception(std::string message): http_exception(message)
+{
+}
+
+server_error_exception::server_error_exception(std::string message): http_exception(message)
+{
+}
+
+std::string extend_index_html(std::string path)
+{
+ if (path.size() && path.back() == '/')
+  path.append("index.html");
+ return path;
+}
+
+std::string generate_response(http::request<http::string_body>& req, const Config& config, const Socket& socket)
+{
+ // Make sure we can handle the method
+ if( req.method() != http::verb::get &&
+     req.method() != http::verb::head)
+  throw bad_request_exception("Unknown HTTP-method");
+
+ // Request path must be absolute and not contain "..".
+ if( req.target().empty() ||
+     req.target()[0] != '/' ||
+     req.target().find("..") != beast::string_view::npos)
+  throw bad_request_exception("Illegal request-target");
+
+ // Build the path to the requested file
+ std::string host{req["host"]}; // TODO: just use string_view
+ std::string target{req.target()};
+ std::string path = path_cat(config.DocRoot(socket, host, target), extend_index_html(std::string(req.target())));
+
+ std::string result;
+ try {
+  result = File::getFile(path);
+ } catch (const std::runtime_error& ex) {
+  throw not_found_exception(std::string(req.target()));
+ } catch (const std::exception& ex) {
+  throw server_error_exception(ex.what());
+ }
+
+ return result;
+}
+
-- 
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