From c0ccf16c69d43a89674640c61d13ec2c02b128d6 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Fri, 10 Apr 2020 15:36:59 +0200
Subject: First working plugin: static-files

---
 plugins/static-files/static-files.cpp | 68 +++++++++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 2 deletions(-)

(limited to 'plugins/static-files')

diff --git a/plugins/static-files/static-files.cpp b/plugins/static-files/static-files.cpp
index 358e239..ad85f22 100644
--- a/plugins/static-files/static-files.cpp
+++ b/plugins/static-files/static-files.cpp
@@ -1,8 +1,49 @@
 #include "static-files.h"
 
+#include <filesystem>
+#include <fstream>
 #include <iostream>
+#include <string>
 
 using namespace std::string_literals;
+namespace fs = std::filesystem;
+
+namespace {
+
+std::string getFile(const fs::path& filename)
+{
+ std::ifstream file(filename.string(), std::ios::in | std::ios::binary | std::ios::ate);
+
+ if (file.is_open()) {
+  std::ifstream::pos_type fileSize = file.tellg();
+  file.seekg(0, std::ios::beg);
+
+  std::string bytes(fileSize, ' ');
+  file.read(reinterpret_cast<char*>(bytes.data()), fileSize);
+
+  return bytes;
+
+ } else {
+  throw std::runtime_error("Opening "s + filename.string() + " for reading");
+ }
+}
+
+std::string extend_index_html(std::string path)
+{
+ if (path.size() == 0 || (path.size() && path.back() == '/'))
+  path.append("index.html");
+ return path;
+}
+
+// Used to return errors by generating response page and HTTP status code
+std::string HttpStatus(std::string status, std::string message, std::function<plugin_interface_setter_type>& SetResponseHeader)
+{
+ SetResponseHeader("status", status);
+ SetResponseHeader("content_type", "text/html");
+ return status + " " + message;
+}
+
+}
 
 std::string static_files_plugin::name()
 {
@@ -26,9 +67,32 @@ std::string static_files_plugin::generate_page(
 )
 {
  try {
-  return "Static Files "s + GetServerParam("path"s);
+  // Make sure we can handle the method
+  std::string method {GetRequestParam("method")};
+  if (method != "GET" && method != "HEAD")
+   return HttpStatus("400", "Unknown HTTP method", SetResponseHeader);
+
+  // Request path must be absolute and not contain "..".
+  std::string rel_target{GetRequestParam("rel_target")};
+  if (rel_target.find("..") != std::string::npos) {
+   std::string target{GetRequestParam("target")};
+   return HttpStatus("400", "Illegal request: "s + target, SetResponseHeader);
+  }
+
+  // Build the path to the requested file
+  std::string doc_root{GetRequestParam("doc_root")};
+  std::string path {fs::path{doc_root} / extend_index_html(rel_target)};
+
+  try {
+   return getFile(path);
+  } catch (const std::runtime_error& ex) {
+   return HttpStatus("404", "Not found: "s + GetRequestParam("target"), SetResponseHeader);
+  } catch (const std::exception& ex) {
+   return HttpStatus("500", "Internal Server Error: "s + ex.what(), SetResponseHeader);
+  }
+
  } catch (const std::exception& ex) {
-  return "Error: "s + ex.what();
+  return HttpStatus("500", "Unknown Error: "s + ex.what(), SetResponseHeader);
  }
 }
 
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