/
cheeseshop.go
258 lines (243 loc) · 6.78 KB
/
cheeseshop.go
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package main
import (
"crypto/md5"
"fmt"
"gopkg.in/yaml.v2"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/user"
"path/filepath"
"strings"
)
const (
version = "UNKNOWN"
listHead = "<html><head><title>Links for %s</title></head><body><h1>Links for %s</h1>"
listTail = "</body></html>"
listElement = "<a href='%s'>%s</a><br/>"
)
var defaultConfig = []string{"~/.cheeseshop.yml", "/etc/cheeseshop.yml"}
// Config contains configuration
type Config struct {
HTTP int
HTTPS int
Path string
Root string
Shop string
Cert string
Key string
Overwrite bool
Auth map[string]string
}
var config Config
func listRoot(w http.ResponseWriter, r *http.Request) {
log.Printf("Listing root %s", config.Root)
files, err := ioutil.ReadDir(config.Root)
if err != nil {
http.Error(w, fmt.Sprintf("Error listing root directory %s", config.Root), http.StatusInternalServerError)
return
}
w.Write([]byte(fmt.Sprintf(listHead, "root", "root")))
for _, file := range files {
if file.Mode().IsDir() {
w.Write([]byte(fmt.Sprintf(listElement, config.Path+file.Name(), file.Name())))
}
}
w.Write([]byte(listTail))
}
func redirect(url string, w http.ResponseWriter, r *http.Request) {
if r.TLS == nil {
url = "http://" + url
} else {
url = "https://" + url
}
log.Printf("Redirecting to %s", url)
http.Redirect(w, r, url, http.StatusFound)
}
func listDirectory(dir string, w http.ResponseWriter, r *http.Request) {
directory := filepath.Join(config.Root, dir)
if _, err := os.Stat(directory); os.IsNotExist(err) {
url := config.Shop + "/" + dir
redirect(url, w, r)
return
}
log.Printf("Listing directory %s", directory)
files, err := ioutil.ReadDir(directory)
if err != nil {
http.Error(w, fmt.Sprintf("Error listing directory %s", dir), http.StatusInternalServerError)
return
}
w.Write([]byte(fmt.Sprintf(listHead, dir, dir)))
for _, file := range files {
w.Write([]byte(fmt.Sprintf(listElement, config.Path+dir+"/"+file.Name(), file.Name())))
}
w.Write([]byte(listTail))
}
func servePackage(dir, file string, w http.ResponseWriter, r *http.Request) {
filename := filepath.Join(config.Root, dir, file)
if _, err := os.Stat(filename); os.IsNotExist(err) {
url := config.Shop + "/" + dir + "/" + file
redirect(url, w, r)
return
}
log.Printf("Serving file %s", filename)
http.ServeFile(w, r, filename)
}
func copyFile(w http.ResponseWriter, r *http.Request) {
if len(config.Auth) > 0 {
username, password, ok := r.BasicAuth()
sum := fmt.Sprintf("%x", md5.Sum([]byte(password)))
if !ok || config.Auth[username] != sum {
log.Printf("Unauthorized access from %s", username)
http.Error(w, "Not Authorized", http.StatusUnauthorized)
return
}
log.Printf("Granted access for user %s", username)
}
err := r.ParseMultipartForm(100000)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
m := r.MultipartForm
files := m.File["content"]
for _, file := range files {
name := file.Filename
pack := name[:strings.LastIndex(name, "-")]
dir := filepath.Join(config.Root, pack)
path := filepath.Join(config.Root, pack, name)
if _, err := os.Stat(path); err == nil && !config.Overwrite {
log.Printf("Failed attempt to overwrite package %s", name)
http.Error(w, fmt.Sprintf("Package %s already exists", name), http.StatusBadRequest)
return
}
if _, err := os.Stat(dir); os.IsNotExist(err) {
err = os.Mkdir(dir, 0777)
if err != nil {
log.Printf("Error creating directory for package %s", pack)
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
return
}
log.Printf("Created directory for package %s", pack)
}
log.Printf("Writing file %s", name)
f, err := file.Open()
defer f.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
dst, err := os.Create(path)
defer dst.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if _, err := io.Copy(dst, f); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
}
func handler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
parts := strings.Split(r.URL.Path[len(config.Path):], "/")
if len(parts) > 2 {
http.Error(w, fmt.Sprintf("%s is not a valid path", r.URL.Path), http.StatusNotFound)
return
} else if len(parts) == 1 && parts[0] == "" {
listRoot(w, r)
} else if len(parts) == 1 {
listDirectory(parts[0], w, r)
} else {
servePackage(parts[0], parts[1], w, r)
}
} else if r.Method == "POST" {
copyFile(w, r)
}
}
func normalizeFile(file string) string {
if strings.HasPrefix(file, "~") {
usr, _ := user.Current()
dir := usr.HomeDir
file = filepath.Join(dir, file[1:])
}
absfile, err := filepath.Abs(file)
if err != nil {
log.Fatalf("Error getting absolute path for file %s", file)
}
return absfile
}
func loadConfig() {
var file = ""
if len(os.Args) > 1 {
file = os.Args[1]
} else {
for _, path := range defaultConfig {
path = normalizeFile(path)
if _, err := os.Stat(path); err == nil {
file = path
break
}
}
}
if file == "" {
log.Fatal("No configuration file found")
}
log.Printf("Loading %s configuration file", file)
source, err := ioutil.ReadFile(file)
if err != nil {
log.Fatalf("Error loading config file %s", file)
}
err = yaml.Unmarshal(source, &config)
if err != nil {
log.Fatalf("Error parsing config file %s: %s", file, err)
}
}
func checkConfig() {
config.Root = normalizeFile(config.Root)
info, err := os.Stat(config.Root)
if err != nil {
log.Fatalf("Root directory %s not found", config.Root)
}
if !info.Mode().IsDir() {
log.Fatalf("Root %s is not a directory", config.Root)
}
if !strings.HasPrefix(config.Path, "/") {
config.Path = "/" + config.Path
}
if !strings.HasSuffix(config.Path, "/") {
config.Path = config.Path + "/"
}
if config.HTTP > 65535 || config.HTTP < 0 {
log.Fatalf("Bad HTTP port number %d", config.HTTP)
}
if config.HTTPS > 65535 || config.HTTPS < 0 {
log.Fatalf("Bad HTTPS port number %d", config.HTTPS)
}
if config.HTTP == 0 && config.HTTPS == 0 {
log.Fatal("At least one of HTTP or HTTPS must be enabled")
}
}
func main() {
loadConfig()
checkConfig()
log.Printf("Starting CheeseShop (ports: %d & %d, path: %s, root: %s, shop: %s, cert: %s, key: %s, overwrite: %t)",
config.HTTP, config.HTTPS, config.Path, config.Root, config.Shop, config.Cert, config.Key, config.Overwrite)
http.HandleFunc(config.Path, handler)
if config.HTTP != 0 {
go func() {
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", config.HTTP), nil))
}()
}
if config.HTTPS != 0 {
go func() {
log.Fatal(http.ListenAndServeTLS(fmt.Sprintf(":%d", config.HTTPS),
normalizeFile(config.Cert), normalizeFile(config.Key), nil))
}()
}
wait := make(chan bool, 1)
<-wait
}