From ef7ed9034bebe80a429112930ab0481c8aa66c95 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Tue, 21 Apr 2020 18:57:11 +0200
Subject: Weblog (WIP)

---
 plugins/weblog/weblog.cpp | 260 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 197 insertions(+), 63 deletions(-)

(limited to 'plugins')

diff --git a/plugins/weblog/weblog.cpp b/plugins/weblog/weblog.cpp
index 1c58b73..0c0ffcd 100644
--- a/plugins/weblog/weblog.cpp
+++ b/plugins/weblog/weblog.cpp
@@ -2,6 +2,7 @@
 
 #include <boost/algorithm/string/predicate.hpp>
 
+#include <algorithm>
 #include <filesystem>
 #include <fstream>
 #include <iostream>
@@ -12,79 +13,203 @@ 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]
+ const size_t number_of_articles_on_front_page {10};
+ const std::string article_filename{"article.data"};
+
+ // Return a reasonable mime type based on the extension of a file.
+ std::string mime_type(fs::path 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";
-}
+  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);
+ // 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;
+ }
 
- if (file.is_open()) {
-  std::ifstream::pos_type fileSize = file.tellg();
-  file.seekg(0, std::ios::beg);
+ 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);
+   std::string bytes(fileSize, ' ');
+   file.read(reinterpret_cast<char*>(bytes.data()), fileSize);
 
-  return bytes;
+   return bytes;
 
- } else {
-  throw std::runtime_error("Opening "s + filename.string() + " for reading");
+  } else {
+   throw std::runtime_error("Opening "s + filename.string() + " for reading");
+  }
  }
-}
 
-bool is_index_page(std::string& path)
-{
- return (path.size() == 0 || path.back() == '/');
-}
+ bool is_index_page(std::string& rel_target)
+ {
+  return (rel_target.size() == 0 || rel_target == "/");
+ }
 
-std::string generateIndexPage(std::function<plugin_interface_setter_type>& SetResponseHeader)
-{
- return "<html><body><h1>Blog</h1></body></html>";
-}
+ bool is_article_page(std::string& rel_target, fs::path& path)
+ {
+  return (rel_target.size() >= 2 && rel_target.back() == '/' && fs::is_directory(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;
-}
+ bool is_article_file(std::string& rel_target, fs::path& path)
+ {
+  return (fs::is_regular_file(path) && path.filename().string() != article_filename);
+ }
 
-}
+ struct ArticleInfo
+ {
+  fs::path path;
+  std::string subject;
+  std::string date;
+ };
+
+ // get article metadata from header lines
+ std::unordered_map<std::string, std::string> getMetaData(fs::path path)
+ {
+  if (path.string().size() > 0 && path.string().back() == '/') {
+   std::string s {path.string()};
+   path = s.substr(0, s.size() - 1);
+  }
+  std::unordered_map<std::string, std::string> result;
+
+  std::string pathname{path.filename().string()};
+  // ISO date
+  std::string date{pathname.substr(0, 4) + "-"s + pathname.substr(4, 2) + "-"s + pathname.substr(6, 2)};
+  std::string time{pathname.substr(9, 2) + ":"s + pathname.substr(11, 2)};
+  if (time != "00:00")
+   date += " " + time;
+
+  result["Date"] = date;
+
+  fs::path filepath {path / article_filename};
+
+  std::ifstream file(filepath.string(), std::ios::in);
+
+  if (file.is_open()) {
+   std::string line;
+   while (!file.eof()) {
+    std::getline(file, line);
+    if (line.empty()) // found header end
+     break;
+    size_t pos {line.find(": ")};
+    if (pos == line.npos) {
+     std::cerr << "Warning: Found bad header line in " << filepath << ": " << line << std::endl;
+     continue;
+    }
+    result[line.substr(0, pos)] = line.substr(pos + 2);
+   }
+   return result;
+
+  } else {
+   throw std::runtime_error("Opening "s + filepath.string() + " for reading");
+  }
+ }
+
+ std::vector<ArticleInfo> getArticleList(fs::path& path)
+ {
+  std::vector<ArticleInfo> result;
+
+  for (auto& year_entry: fs::directory_iterator(path)) {
+   for (auto& entry: fs::directory_iterator(year_entry.path())) {
+    auto metaData{getMetaData(entry.path())};
+    result.emplace_back(ArticleInfo{entry.path(), metaData.at("Subject"), metaData.at("Date")});
+   }
+  }
+
+  size_t size{std::min(number_of_articles_on_front_page, result.size())};
+  // sort backwards
+  std::partial_sort(result.begin(), result.begin() + size, result.end(), [](const ArticleInfo& a0, const ArticleInfo& a1){ return a0.date > a1.date;});
+  
+  return {result.begin(), result.begin() + size};
+ }
+
+ std::string generateIndexPage(fs::path& path,
+                               std::function<std::string(const std::string& key)>& GetRequestParam,
+                               std::function<plugin_interface_setter_type>& SetResponseHeader)
+ {
+  try {
+   std::string result{"<html><body><h1>"s + GetRequestParam("WEBLOG_NAME") + "</h1>"s};
+   
+   fs::path link{ GetRequestParam("rel_target")};
+   
+   auto list{getArticleList(path)};
+   for (const auto& article: list) {
+    result += "<h2><a href=\"" + (link / article.path.filename()).string() + "/\">"s + article.subject + "</a></h2>"s + article.date + "<br/>"s;
+   }
+   result += "</body></html>";
+   return result;
+  } catch (const std::exception& ex) {
+   return HttpStatus("500", "Reading Index page: "s + ex.what(), SetResponseHeader);
+  }
+ }
+
+ std::string generateArticlePage(fs::path& path,
+                                 std::function<plugin_interface_setter_type>& SetResponseHeader)
+ {
+  try {
+   auto metaData{getMetaData(path)};
+
+   std::string data { getFile(path / article_filename)};
+
+   size_t pos {data.find("\n\n")};
+   if (pos == data.npos)
+    throw std::runtime_error("Error parsing article");
+   
+   std::string result { "<html><body><h1>"s + metaData.at("Subject") + "</h1>"s + metaData.at("Date") + "<br/><br/>"s + data.substr(pos + 2) + "</body></html>"s};
+
+   return result;
+  } catch (const std::exception& ex) {
+   return HttpStatus("500", "Reading Article: "s + ex.what(), SetResponseHeader);
+  }
+ }
+
+ std::string generateArticleFile(fs::path& path, std::function<plugin_interface_setter_type>& SetResponseHeader)
+ {
+  try {
+   SetResponseHeader("content_type", mime_type(path));
+   return getFile(path);
+  } catch (const std::exception& ex) {
+   return HttpStatus("500", "Reading Article file: "s + ex.what(), SetResponseHeader);
+  }
+ }
+
+} // anonymous namespace
 
 std::string weblog_plugin::name()
 {
@@ -122,6 +247,9 @@ std::string weblog_plugin::generate_page(
 
   // Build the path to the requested file
   std::string doc_root{GetRequestParam("doc_root")};
+  if (rel_target.size() >= 4 && std::for_each(rel_target.begin(), rel_target.begin() + 4, isdigit)) {
+   rel_target = rel_target.substr(0, 4) + "/" + rel_target;
+  }
   fs::path path {fs::path{doc_root} / rel_target};
   if (target.size() && target.back() != '/' && fs::is_directory(path)) {
    std::string location{GetRequestParam("location") + "/"s};
@@ -132,7 +260,13 @@ std::string weblog_plugin::generate_page(
   SetResponseHeader("content_type", "text/html");
   
   if (is_index_page(rel_target))
-   return generateIndexPage(SetResponseHeader);
+   return generateIndexPage(path, GetRequestParam, SetResponseHeader);
+
+  if (is_article_page(rel_target, path))
+   return generateArticlePage(path, SetResponseHeader);
+
+  if (is_article_file(rel_target, path))
+   return generateArticleFile(path, SetResponseHeader);
 
   return HttpStatus("404", "Bad path specification: "s + rel_target, SetResponseHeader);
 
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