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server.go
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server.go
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package main
import (
"fmt"
"html/template"
"io"
"log"
"math"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"sort"
"strings"
)
const (
tarGzKey = "tar.gz"
tarGzValue = "true"
tarGzContentType = "application/x-tar+gzip"
zipKey = "zip"
zipValue = "true"
zipContentType = "application/zip"
osPathSeparator = string(filepath.Separator)
)
const directoryListingTemplateText = `
<html>
<head>
<title>{{ .Title }}</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>body{font-family: sans-serif;}td{padding:.5em;}a{display:block;}tbody tr:nth-child(odd){background:#eee;}.number{text-align:right}.text{text-align:left;word-break:break-all;}canvas,table{width:100%;max-width:100%;}</style>
</head>
<body>
<h1>{{ .Title }}</h1>
{{ if or .Files .AllowUpload }}
<table>
<thead>
<th></th>
<th colspan=2 class=number>Size (bytes)</th>
</thead>
<tbody>
{{- if .Files }}
<tr><td colspan=3><a href="{{ .TarGzURL }}">.tar.gz of all files</a></td></tr>
<tr><td colspan=3><a href="{{ .ZipURL }}">.zip of all files</a></td></tr>
{{- end }}
{{- range .Files }}
<tr>
{{ if (not .IsDir) }}
<td class=text><a href="{{ .URL.String }}">{{ .Name }}</td>
<td class=number>{{.Size.String }}</td>
<td class=number>({{ .Size | printf "%d" }})</td>
{{ else }}
<td colspan=3 class=text><a href="{{ .URL.String }}">{{ .Name }}</td>
{{ end }}
</tr>
{{- end }}
{{- if .AllowUpload }}
<tr><td colspan=3><form method="post" enctype="multipart/form-data"><input required name="file" type="file"/><input value="Upload" type="submit"/></form></td></tr>
{{- end }}
</tbody>
</table>
{{ end }}
</body>
</html>
`
type fileSizeBytes int64
func (f fileSizeBytes) String() string {
const (
KB = 1024
MB = 1024 * KB
GB = 1024 * MB
)
divBy := func(x int64) int {
return int(math.Round(float64(f) / float64(x)))
}
switch {
case f < KB:
return fmt.Sprintf("%d", f)
case f < MB:
return fmt.Sprintf("%dK", divBy(KB))
case f < GB:
return fmt.Sprintf("%dM", divBy(MB))
case f >= GB:
fallthrough
default:
return fmt.Sprintf("%dG", divBy(GB))
}
}
type directoryListingFileData struct {
Name string
Size fileSizeBytes
IsDir bool
URL *url.URL
}
type directoryListingData struct {
Title string
ZipURL *url.URL
TarGzURL *url.URL
Files []directoryListingFileData
AllowUpload bool
}
type fileHandler struct {
route string
path string
allowUpload bool
allowDelete bool
}
var (
directoryListingTemplate = template.Must(template.New("").Parse(directoryListingTemplateText))
)
func (f *fileHandler) serveStatus(w http.ResponseWriter, r *http.Request, status int) error {
w.WriteHeader(status)
_, err := w.Write([]byte(http.StatusText(status)))
if err != nil {
return err
}
return nil
}
func (f *fileHandler) serveTarGz(w http.ResponseWriter, r *http.Request, path string) error {
w.Header().Set("Content-Type", tarGzContentType)
name := filepath.Base(path) + ".tar.gz"
w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename=%q`, name))
return tarGz(w, path)
}
func (f *fileHandler) serveZip(w http.ResponseWriter, r *http.Request, osPath string) error {
w.Header().Set("Content-Type", zipContentType)
name := filepath.Base(osPath) + ".zip"
w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename=%q`, name))
return zip(w, osPath)
}
func (f *fileHandler) serveDir(w http.ResponseWriter, r *http.Request, osPath string) error {
d, err := os.Open(osPath)
if err != nil {
return err
}
files, err := d.Readdir(-1)
if err != nil {
return err
}
sort.Slice(files, func(i, j int) bool { return files[i].Name() < files[j].Name() })
w.Header().Set("Content-Type", "text/html; charset=utf-8")
return directoryListingTemplate.Execute(w, directoryListingData{
AllowUpload: f.allowUpload,
Title: func() string {
relPath, _ := filepath.Rel(f.path, osPath)
return filepath.Join(filepath.Base(f.path), relPath)
}(),
TarGzURL: func() *url.URL {
url := *r.URL
q := url.Query()
q.Set(tarGzKey, tarGzValue)
url.RawQuery = q.Encode()
return &url
}(),
ZipURL: func() *url.URL {
url := *r.URL
q := url.Query()
q.Set(zipKey, zipValue)
url.RawQuery = q.Encode()
return &url
}(),
Files: func() (out []directoryListingFileData) {
for _, d := range files {
name := d.Name()
if d.IsDir() {
name += osPathSeparator
}
fileData := directoryListingFileData{
Name: name,
IsDir: d.IsDir(),
Size: fileSizeBytes(d.Size()),
URL: func() *url.URL {
url := *r.URL
url.Path = path.Join(url.Path, name)
if d.IsDir() {
url.Path += "/"
}
return &url
}(),
}
out = append(out, fileData)
}
return out
}(),
})
}
func (f *fileHandler) serveUploadTo(w http.ResponseWriter, r *http.Request, osPath string) error {
if err := r.ParseForm(); err != nil {
return err
}
in, h, err := r.FormFile("file")
if err == http.ErrMissingFile {
w.Header().Set("Location", r.URL.String())
w.WriteHeader(303)
}
if err != nil {
return err
}
outPath := filepath.Join(osPath, filepath.Base(h.Filename))
out, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer out.Close()
if _, err := io.Copy(out, in); err != nil {
return err
}
w.Header().Set("Location", r.URL.String())
w.WriteHeader(303)
return nil
}
// ServeHTTP is http.Handler.ServeHTTP
func (f *fileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log.Printf("[%s] %s %s %s", f.path, r.RemoteAddr, r.Method, r.URL.String())
urlPath := r.URL.Path
if !strings.HasPrefix(urlPath, "/") {
urlPath = "/" + urlPath
}
urlPath = strings.TrimPrefix(urlPath, f.route)
urlPath = strings.TrimPrefix(urlPath, "/"+f.route)
osPath := strings.ReplaceAll(urlPath, "/", osPathSeparator)
osPath = filepath.Clean(osPath)
osPath = filepath.Join(f.path, osPath)
info, err := os.Stat(osPath)
switch {
case os.IsNotExist(err):
_ = f.serveStatus(w, r, http.StatusNotFound)
case os.IsPermission(err):
_ = f.serveStatus(w, r, http.StatusForbidden)
case err != nil:
_ = f.serveStatus(w, r, http.StatusInternalServerError)
case !f.allowDelete && r.Method == http.MethodDelete:
_ = f.serveStatus(w, r, http.StatusForbidden)
case !f.allowUpload && r.Method == http.MethodPost:
_ = f.serveStatus(w, r, http.StatusForbidden)
case r.URL.Query().Get(zipKey) != "":
err := f.serveZip(w, r, osPath)
if err != nil {
_ = f.serveStatus(w, r, http.StatusInternalServerError)
}
case r.URL.Query().Get(tarGzKey) != "":
err := f.serveTarGz(w, r, osPath)
if err != nil {
_ = f.serveStatus(w, r, http.StatusInternalServerError)
}
case f.allowUpload && info.IsDir() && r.Method == http.MethodPost:
err := f.serveUploadTo(w, r, osPath)
if err != nil {
_ = f.serveStatus(w, r, http.StatusInternalServerError)
}
case f.allowDelete && !info.IsDir() && r.Method == http.MethodDelete:
err := os.Remove(osPath)
if err != nil {
_ = f.serveStatus(w, r, http.StatusInternalServerError)
}
case info.IsDir():
err := f.serveDir(w, r, osPath)
if err != nil {
_ = f.serveStatus(w, r, http.StatusInternalServerError)
}
default:
http.ServeFile(w, r, osPath)
}
}