From 8b93572b386256c53c12012be87adabd73d80520 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Sun, 19 Apr 2020 19:46:14 +0200
Subject: Weblog (WIP)

---
 Makefile                  |   2 +-
 debian/changelog          |   6 +++
 plugins/weblog/Makefile   |  16 ++----
 plugins/weblog/weblog.cpp | 121 +++++++++++++++++++++++++++++++++++++++++++++-
 plugins/weblog/weblog.h   |  10 +++-
 webserver.conf            |   4 ++
 6 files changed, 143 insertions(+), 16 deletions(-)

diff --git a/Makefile b/Makefile
index bc4977b..de0ce07 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 DISTROS=debian10
 VERSION=$(shell dpkg-parsechangelog --show-field Version)
 PROJECTNAME=webserver
-PLUGINS=static-files webbox cgi # weblog fcgi
+PLUGINS=static-files webbox cgi weblog # fcgi
 
 CXX=clang++-10
 
diff --git a/debian/changelog b/debian/changelog
index d9802d9..64bc601 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+webserver (1.2) unstable; urgency=medium
+
+  * Added Weblog module
+
+ -- Roland Reichwein <rr@antcom.de>  Sun, 19 Apr 2020 19:07:24 +0200
+
 webserver (1.1) unstable; urgency=medium
 
   * Added CGI
diff --git a/plugins/weblog/Makefile b/plugins/weblog/Makefile
index 27b68fc..ffd31e1 100644
--- a/plugins/weblog/Makefile
+++ b/plugins/weblog/Makefile
@@ -25,7 +25,7 @@ CXXFLAGS+= -pthread -fvisibility=hidden -fPIC
 ifeq ($(CXX),clang++-10)
 CXXFLAGS+=-std=c++20 #-stdlib=libc++
 else
-CXXFLAGS+=-std=c++2a
+CXXFLAGS+=-std=c++17
 endif
 
 CXXTESTFLAGS=-Igoogletest/include -Igooglemock/include/ -Igoogletest -Igooglemock
@@ -52,8 +52,8 @@ LIBS+= \
 #-lstdc++fs
 else
 LIBS+= \
--lstdc++
-#-lstdc++fs
+-lstdc++ \
+-lstdc++fs
 endif
 
 PROGSRC=\
@@ -92,14 +92,8 @@ googletest/src/%.o: googletest/src/%.cc
 ADD_DEP=Makefile
 
 install:
-	mkdir -p $(DESTDIR)/usr/bin
-	cp webserver $(DESTDIR)/usr/bin
-
 	mkdir -p $(DESTDIR)/usr/lib/webserver/plugins
-	mkdir -p $(DESTDIR)/usr/local/lib/webserver/plugins
-
-	mkdir -p $(DESTDIR)/etc
-	cp webserver.conf $(DESTDIR)/etc/webserver.conf
+	cp $(PROJECTNAME).so $(DESTDIR)/usr/lib/webserver/plugins
 
 # misc ---------------------------------------------------
 deb:
@@ -116,7 +110,7 @@ debs: $(DISTROS)
 
 clean:
 	-rm -f test-$(PROJECTNAME) $(PROJECTNAME)
-	-find . -name '*.o' -o -name '*.d' -o -name '*.gcno' -o -name '*.gcda' | xargs rm -f
+	-find . -name '*.o' -o -name '*.so' -o -name '*.d' -o -name '*.gcno' -o -name '*.gcda' | xargs rm -f
 
 zip: clean
 	-rm -f ../$(PROJECTNAME).zip
diff --git a/plugins/weblog/weblog.cpp b/plugins/weblog/weblog.cpp
index ef90a53..1c58b73 100644
--- a/plugins/weblog/weblog.cpp
+++ b/plugins/weblog/weblog.cpp
@@ -1,8 +1,90 @@
 #include "weblog.h"
 
+#include <boost/algorithm/string/predicate.hpp>
+
+#include <filesystem>
+#include <fstream>
 #include <iostream>
+#include <string>
 
 using namespace std::string_literals;
+namespace fs = std::filesystem;
+
+namespace {
+
+// Return a reasonable mime type based on the extension of a file.
+std::string
+mime_type(fs::path path)
+{
+ using boost::algorithm::iequals;
+ auto const ext = [&path]
+ {
+  size_t pos = path.string().rfind(".");
+  if (pos == std::string::npos)
+   return std::string{};
+  return path.string().substr(pos);
+ }();
+ if(iequals(ext, ".htm"))  return "text/html"; // TODO: unordered_map
+ 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";
+}
+
+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");
+ }
+}
+
+bool is_index_page(std::string& path)
+{
+ return (path.size() == 0 || path.back() == '/');
+}
+
+std::string generateIndexPage(std::function<plugin_interface_setter_type>& SetResponseHeader)
+{
+ return "<html><body><h1>Blog</h1></body></html>";
+}
+
+// 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 weblog_plugin::name()
 {
@@ -19,8 +101,43 @@ weblog_plugin::~weblog_plugin()
  //std::cout << "Plugin destructor" << std::endl;
 }
 
-std::string weblog_plugin::generate_page(std::string path)
+std::string weblog_plugin::generate_page(
+  std::function<std::string(const std::string& key)>& GetServerParam,
+  std::function<std::string(const std::string& key)>& GetRequestParam, // request including body (POST...)
+  std::function<void(const std::string& key, const std::string& value)>& SetResponseHeader // to be added to result string
+)
 {
- return "Blog "s + path;
+ try {
+  // 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 not contain "..".
+  std::string rel_target{GetRequestParam("rel_target")};
+  std::string target{GetRequestParam("target")};
+  if (rel_target.find("..") != std::string::npos) {
+   return HttpStatus("400", "Illegal request: "s + target, SetResponseHeader);
+  }
+
+  // Build the path to the requested file
+  std::string doc_root{GetRequestParam("doc_root")};
+  fs::path path {fs::path{doc_root} / rel_target};
+  if (target.size() && target.back() != '/' && fs::is_directory(path)) {
+   std::string location{GetRequestParam("location") + "/"s};
+   SetResponseHeader("location", location);
+   return HttpStatus("301", "Correcting directory path", SetResponseHeader);
+  }
+  
+  SetResponseHeader("content_type", "text/html");
+  
+  if (is_index_page(rel_target))
+   return generateIndexPage(SetResponseHeader);
+
+  return HttpStatus("404", "Bad path specification: "s + rel_target, SetResponseHeader);
+
+ } catch (const std::exception& ex) {
+  return HttpStatus("500", "Unknown Error: "s + ex.what(), SetResponseHeader);
+ }
 }
 
diff --git a/plugins/weblog/weblog.h b/plugins/weblog/weblog.h
index 5433e1c..28b4ab3 100644
--- a/plugins/weblog/weblog.h
+++ b/plugins/weblog/weblog.h
@@ -1,14 +1,20 @@
 #pragma once
 
-#include "../plugin_interface.h"
+#include "../../plugin_interface.h"
 
 class weblog_plugin: public webserver_plugin_interface 
 {
 public:
  weblog_plugin();
  ~weblog_plugin();
+ 
  std::string name();
- std::string generate_page(std::string path);
+ std::string generate_page(
+  std::function<std::string(const std::string& key)>& GetServerParam,
+  std::function<std::string(const std::string& key)>& GetRequestParam, // request including body (POST...)
+  std::function<void(const std::string& key, const std::string& value)>& SetResponseHeader // to be added to result string
+ );
+
 };
 
 extern "C" BOOST_SYMBOL_EXPORT weblog_plugin webserver_plugin;
diff --git a/webserver.conf b/webserver.conf
index 46046d9..16ac3e0 100644
--- a/webserver.conf
+++ b/webserver.conf
@@ -31,6 +31,10 @@
     <WEBBOX_READONLY>0</WEBBOX_READONLY>
     <auth login="abc" password="def"/>
    </path>
+   <path requested="/blog">
+    <plugin>weblog</plugin>
+    <target>/home/ernie/testblog</target>
+   </path>
    <path requested="/cgi-bin">
     <plugin>cgi</plugin>
     <target>/home/ernie/code/webserver/cgi-bin</target>
-- 
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