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main.go
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main.go
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package main
import (
"fmt"
"net"
"go-http-server/lib/utils/http"
"regexp"
"strings"
"flag"
"os"
"path/filepath"
)
func handleConnection(conn net.Conn, directory string) {
readBuffer := make([]byte, 1024)
n, err := conn.Read(readBuffer)
if err != nil {
fmt.Printf("Error reading from TCP connection: %v\n", err)
return
}
connectionData := string(readBuffer[:n])
fmt.Printf("\nReading from TCP connection:\n%v\n", connectionData)
pattern := "/echo/.+"
echoRegExp, err := regexp.Compile(pattern)
if err != nil {
fmt.Println("Error compiling regex pattern:", err)
return
}
requestpath := http.GetRequestPath(connectionData)
if requestpath == "/" {
body := "server responded to /"
response := http.BuildResponse(
200,
"OK",
body,
"Content-Type: text/plain",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
} else if strings.Contains(connectionData, "POST /files") {
fileName := strings.Split(requestpath, "/")[2]
fullPath := filepath.Join(directory, fileName)
reqBody := strings.Split(connectionData, "\r\n\r\n")[1]
file, err := os.Create(fullPath) //create a new file
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
writeErr := os.WriteFile(fullPath, []byte(reqBody), 0666)
if writeErr != nil {
fmt.Println(writeErr)
}
body := reqBody
response := http.BuildResponse(
201,
"OK",
body,
"Content-Type: application/octet-stream",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
} else if strings.Contains(requestpath, "/files") {
fileName := strings.Split(requestpath, "/")[2]
fullPath := filepath.Join(directory, fileName)
_, err := os.Stat(fullPath)
if err != nil {
fmt.Println("Specified file does not exist")
body := "Specified file does not exist"
response := http.BuildResponse(
404,
"Not Found",
body,
"Content-Type: text/plain",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
return
}
data, err := os.ReadFile(fullPath)
fileData := string(data)
fmt.Printf("file data: %v\n", fileData)
body := fileData
response := http.BuildResponse(
200,
"OK",
body,
"Content-Type: application/octet-stream",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
} else if requestpath == "/user-agent" {
var body string
for _, str := range strings.Split(connectionData, "\r\n") {
if strings.Contains(str, "User-Agent:") {
body = strings.Split(str, " ")[1]
}
}
response := http.BuildResponse(
200,
"OK",
body,
"Content-Type: text/plain",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
} else if echoRegExp.MatchString(requestpath){
var body string
for index, str := range strings.Split(requestpath, "/") {
if index < 2 {
continue
} else if index == 2 {
body += str
} else {
body += "/" + str
}
}
response := http.BuildResponse(
200,
"OK",
body,
"Content-Type: text/plain",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
} else {
body := "Route not found"
response := http.BuildResponse(
404,
"Not Found",
body,
"Content-Type: text/plain",
fmt.Sprintf("Content-Length: %v", len(body)),
)
conn.Write(response)
}
defer conn.Close()
}
func main () {
fmt.Println("HTTP SERVER RUNNING")
ln, err := net.Listen("tcp", ":4221")
if err != nil {
fmt.Printf("Error binding to a port: %v\n", err)
}
var directory string
flag.StringVar(&directory, "directory", "", "Specify the directory")
flag.Parse()
defer ln.Close()
for {
conn, err := ln.Accept()
if err != nil {
fmt.Printf("Error accepting TCP connection: %v\n", err)
}
fmt.Printf("New TCP connection accepted")
go handleConnection(conn, directory)
}
}