feat: basic file handling

2026-02-15 16:31:49 +01:00
parent fccc976b4e
commit f85afce949
4 changed files with 142 additions and 4 deletions
--- a/http_handle.go
+++ b/http_handle.go
@@ -0,0 +1,115 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"log/slog"
+	"mime"
+	"net"
+	"os"
+	"path"
+	"strings"
+
+	"tilok.dev/go-http-server/config"
+	rh "tilok.dev/go-http-server/response_helper"
+)
+
+func HandleHTTPRequest(headers Headers, conn net.Conn) {
+	if strings.Contains(headers.Uri, "..") {
+		conn.Write([]byte("HTTP/1.1 403 Fuck you\r\n\r\n"))
+		conn.Close()
+		return
+	}
+	config := config.GetConfig()
+	_, err := os.Stat(config.Htdocs)
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			CreateDefaultHtdocs(config.Htdocs)
+		} else {
+			slog.Error("Failed to stat directory", "error", err)
+			panic("Failed to stat directory")
+		}
+	}
+
+	desiredPath := path.Join(config.Htdocs, headers.Uri)
+	if headers.Uri == "/" {
+		desiredPath = path.Join(config.Htdocs, "index.html")
+	}
+
+	file, err := os.Open(desiredPath)
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			rh.RespondWithStatusCode(404, conn)
+			return
+		}
+		if errors.Is(err, fs.ErrPermission) {
+			rh.RespondWithStatusCode(403, conn)
+			return
+		}
+
+		slog.Error("Unhandled error case", "err", err)
+		rh.RespondWithStatusCode(500, conn)
+		return
+	}
+
+	defer file.Close()
+	sendFile(file, conn)
+
+	conn.Close()
+}
+
+func sendFile(file *os.File, conn net.Conn) {
+	reader := bufio.NewReader(file)
+	defer file.Close()
+
+	fileStat, err := file.Stat()
+	if err != nil {
+		slog.Error("Failed to stat file", "error", err)
+		rh.RespondWithStatusCode(500, conn)
+		return
+	}
+
+	parts := strings.Split(fileStat.Name(), ".")
+	ext := "." + parts[len(parts)-1]
+	mime_type := mime.TypeByExtension(ext)
+	length := fileStat.Size()
+
+	if mime_type == "" {
+		mime_type = "application/octet-stream"
+	}
+
+	header := fmt.Sprintf("HTTP/1.1 200 OK\r\nContent-Type: %s\r\nContent-Length: %d\r\nServer: Tilo's Go HTTP Server\r\n\r\n", mime_type, length)
+	conn.Write([]byte(header))
+
+	buf := make([]byte, 4096)
+	for {
+		n, err := reader.Read(buf)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			slog.Error("Failed to read file", "error", err)
+			rh.RespondWithStatusCode(500, conn)
+			return
+		}
+		conn.Write(buf[:n])
+	}
+
+}
+
+func CreateDefaultHtdocs(dirPath string) error {
+	err := os.MkdirAll(dirPath, 0755)
+	if err != nil {
+		return err
+	}
+
+	err = os.WriteFile(path.Join(dirPath, "index.html"), []byte("<DOCTYPE html><html><head><title>Hello World</title></head><body><h1>Hello World</h1></body></html>"), 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}