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handler.go
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handler.go
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package main
import (
"errors"
"fmt"
"io"
"io/fs"
"log"
"net/http"
"os"
"path/filepath"
)
var indexFilenames = []string{
"index.html",
"index.htm",
}
type requestContext struct {
w http.ResponseWriter
r *http.Request
path string
filename string
}
func newContext(foldername string, w http.ResponseWriter, r *http.Request) requestContext {
path := filepath.Clean(r.RequestURI)
filename := filepath.Join(foldername, path)
return requestContext{
w: w,
r: r,
path: path,
filename: filename,
}
}
func makeHandler(foldername string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Printf("[%s] %s %q", r.RemoteAddr, r.Method, r.RequestURI)
if err := handleRequest(newContext(foldername, w, r)); err != nil {
respondWithStatus(w, http.StatusInternalServerError)
log.Printf("\t=> %v", err)
}
})
}
func respondWithStatus(w http.ResponseWriter, status int) error {
w.WriteHeader(status)
_, err := fmt.Fprintln(w, http.StatusText(status))
return err
}
func handleRequest(ctx requestContext) error {
switch ctx.r.Method {
case http.MethodGet:
return handleGet(ctx)
case http.MethodPost, http.MethodPut:
return handlePost(ctx)
default:
return errors.New("ignored request because of the http method")
}
}
func handleGet(ctx requestContext) error {
info, err := os.Stat(ctx.filename)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return respondWithStatus(ctx.w, http.StatusNotFound)
}
return err
}
if info.IsDir() {
for _, filename := range indexFilenames {
filename = filepath.Join(ctx.filename, filename)
if fileExists(filename) {
ctx.filename = filename
return serveFile(ctx)
}
}
return serveFolder(ctx)
} else {
return serveFile(ctx)
}
}
func fileExists(filename string) bool {
_, err := os.Stat(filename)
return err == nil
}
func serveFile(ctx requestContext) error {
http.ServeFile(ctx.w, ctx.r, ctx.filename)
return nil
}
func serveFolder(ctx requestContext) error {
files, err := os.ReadDir(ctx.filename)
if err != nil {
return err
}
infos := make([]fs.FileInfo, len(files))
for i, file := range files {
infos[i], err = file.Info()
if err != nil {
return err
}
}
return renderFolder(ctx.w, FolderData{Path: ctx.path, Entries: infos})
}
func handlePost(ctx requestContext) error {
r, err := ctx.r.MultipartReader()
if err != nil {
return err
}
for {
part, err := r.NextPart()
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
filename := part.FileName()
if filename != "" {
log.Printf("\tuploading %q to %q", filename, ctx.filename)
}
if ctx.r.Method == http.MethodPost && fileExists(filename) {
log.Printf("\t%q already exists!", filename)
return respondWithStatus(ctx.w, http.StatusConflict)
}
writeFile(part, filepath.Join(ctx.filename, filename))
}
}
func writeFile(r io.ReadCloser, filename string) error {
defer r.Close()
f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(f, r)
return err
}