From a32934d4bc910da1deb2a4737750090ec8969240 Mon Sep 17 00:00:00 2001
From: Pablu23 <pablu23@gmx.de>
Date: Mon, 8 Jul 2024 02:04:16 +0200
Subject: [PATCH] Initial commit

---
 .gitignore |   2 +
 server.cpp | 225 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 227 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 server.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..752e637
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.out
+server
diff --git a/server.cpp b/server.cpp
new file mode 100644
index 0000000..6b0eaed
--- /dev/null
+++ b/server.cpp
@@ -0,0 +1,225 @@
+#include <algorithm>
+#include <cstddef>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <map>
+#include <netinet/in.h>
+#include <ostream>
+#include <sstream>
+#include <string>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <vector>
+
+class Request {
+private:
+  std::map<std::string, std::string> m_headers;
+  std::string m_method;
+  std::string m_path;
+  std::vector<std::byte> m_payload;
+  std::string m_protocol;
+
+private:
+  bool protocol(std::stringstream *ss, int *procPart, char c) {
+    if (c == ' ' || c == '\n') {
+      switch (*procPart) {
+      case 0:
+        m_method = ss->str();
+        break;
+      case 1:
+        m_path = ss->str();
+        break;
+      case 2:
+        m_protocol = ss->str();
+        break;
+      }
+      (*procPart)++;
+      ss->str("");
+      if (c == '\n')
+        return false;
+    } else {
+      ss->put(c);
+    }
+    return true;
+  }
+
+public:
+  Request(std::vector<std::byte> buf) {
+    std::string name;
+    std::stringstream ss;
+    bool header = true;
+    int procPart = 0;
+    bool data = false;
+    bool skipNext = false;
+    bool p = true;
+    for (auto &byte : buf) {
+      if (data) {
+        m_payload.push_back(byte);
+        continue;
+      }
+
+      char c = static_cast<char>(byte);
+      if (c == '\r')
+        continue;
+
+      if (p) {
+        p = protocol(&ss, &procPart, c);
+        continue;
+      }
+
+      if (skipNext && c == ' ') {
+        skipNext = false;
+        continue;
+      }
+      skipNext = false;
+
+      if (c == ':' && header) {
+        skipNext = true;
+        header = false;
+        name = ss.str();
+        ss.str("");
+      } else if (c == '\n' && !name.empty()) {
+        m_headers.insert_or_assign(name, ss.str());
+        ss.str("");
+        name.clear();
+        header = true;
+      } else if (c == '\n' && name.empty()) {
+        data = true;
+      } else {
+        ss << c;
+      }
+    }
+  }
+
+  void Print() {
+    std::cout << "Protocol: " << m_protocol << "\n"
+              << "Req: " << m_method << " " << m_path << std::endl;
+    for (const auto &[key, value] : m_headers) {
+      std::cout << "[" << key << "]: [" << value << "]\n";
+    }
+
+    if (HasData()) {
+      std::cout << "Payload: " << std::endl;
+      for (auto &byte : m_payload) {
+        std::cout << static_cast<char>(byte);
+      }
+      std::cout << std::endl;
+    }
+  }
+  bool HasData() { return m_payload.size() != 0; }
+  std::vector<std::byte> Data() { return m_payload; }
+};
+
+class Response {
+private:
+  std::map<std::string, std::string> m_headers;
+  std::vector<std::byte> m_payload;
+
+public:
+  Response(std::vector<std::byte> data) {
+    m_headers.insert(std::pair<std::string, std::string>(
+        "content-length", std::to_string(data.size())));
+    m_payload = data;
+  }
+
+  Response(std::string data) {
+    m_headers.insert(std::pair<std::string, std::string>(
+        "content-length", std::to_string(std::strlen(data.data()))));
+
+    m_payload = std::vector<std::byte>(data.size() + 1);
+    std::transform(data.begin(), data.end(), m_payload.begin(),
+                   [](char c) { return std::byte(c); });
+  }
+
+  void SetContentType(const std::string type) {
+    m_headers.insert_or_assign("content-type", type);
+  }
+
+  void Send(int clientSocket) {
+    std::stringstream ss;
+    ss << "HTTP/1.1 200 OK\n";
+    for (const auto &[key, value] : m_headers) {
+      ss << key << ": " << value << "\n";
+    }
+    if (m_payload.size() >= 0) {
+      ss << "\n";
+      for (auto &byte : m_payload) {
+        std::cout << int(byte) << ' ';
+        char c = static_cast<char>(byte);
+        ss << c;
+      }
+      std::cout << std::endl;
+    }
+    std::string p = ss.str();
+    send(clientSocket, p.data(), p.size(), 0);
+  }
+
+  void Print() {
+    for (const auto &[key, value] : m_headers) {
+      std::cout << "[" << key << "]: [" << value << "]\n";
+    }
+
+    if (m_payload.size() != 0) {
+      std::cout << "Payload: " << std::endl;
+      for (auto &byte : m_payload) {
+        std::cout << static_cast<char>(byte);
+      }
+      std::cout << std::endl;
+    }
+  }
+};
+
+int main() {
+  int serverSocket = socket(AF_INET, SOCK_STREAM, 0);
+  sockaddr_in serverAddress;
+  serverAddress.sin_family = AF_INET;
+  serverAddress.sin_port = htons(8080);
+  serverAddress.sin_addr.s_addr = INADDR_ANY;
+
+  int err = bind(serverSocket, (struct sockaddr *)&serverAddress,
+                 sizeof(serverAddress));
+  if (err != 0) {
+    std::cout << "error binding " << strerror(errno) << std::endl;
+    exit(1);
+  }
+
+  err = listen(serverSocket, 5);
+  if (err != 0) {
+    std::cout << "error listening " << strerror(errno) << std::endl;
+    exit(1);
+  }
+
+  std::vector<std::byte> buffer(1024);
+  while (true) {
+    int clientSocket = accept(serverSocket, nullptr, nullptr);
+    int read = recv(clientSocket, buffer.data(), buffer.size(), 0);
+    buffer.resize(read);
+    Request req(buffer);
+    // req.Print();
+    Response res = Response("Hello world!");
+    if (req.HasData()) {
+      auto data = req.Data();
+      res = Response(data);
+    }
+
+    res.SetContentType("text/plain");
+    // std::cout << "RESPONSE: " << std::endl;
+    // res.Print();
+    res.Send(clientSocket);
+    close(clientSocket);
+  }
+
+  if (shutdown(serverSocket, SHUT_RDWR) < 0) {
+    std::cout << "error shutdown " << strerror(errno) << std::endl;
+    exit(1);
+  }
+
+  if (close(serverSocket) < 0) {
+    std::cout << "error closing socket " << strerror(errno) << std::endl;
+    exit(1);
+  }
+
+  return 0;
+}