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package main
import (
"bytes"
"crypto/sha1"
"encoding/base64"
"encoding/json"
"flag"
"html/template"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
)
var (
tls = flag.String("t", ":8443", "[ip]:port to tls-listen to")
nontls = flag.String("l", "", "optional, non-tls [ip]:port to listen to")
config = flag.String("cfg", "tools.json", "config file with tool-definitions")
cert = flag.String("cert", "cert.pem", "certitifate")
key = flag.String("key", "key.pem", "key")
savedir = flag.String("d", "saved", "direcotry to save the pics.")
tools = []Tool{}
)
type Tool struct {
Name string
Cmd string
Args []string
Suffix string
Description string
Documentation map[string]string
Example string
BgColor string
}
func (t Tool) execute(in io.Reader, w http.ResponseWriter) {
var (
cmd = exec.Command(t.Cmd, t.Args...)
err, buf = &bytes.Buffer{}, &bytes.Buffer{}
)
cmd.Stdin = in
cmd.Stderr = err
cmd.Stdout = buf
if e := cmd.Run(); e == nil {
io.Copy(w, buf)
} else {
log.Printf("%s returned error\n", t.Name)
http.Error(w, err.String(), http.StatusBadRequest)
}
}
func (t Tool) compile() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
t.execute(r.Body, w)
}
}
func (t Tool) svg() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
name := filepath.Base(r.URL.Path)
if file, err := os.Open(filepath.Join(*savedir, name+t.Suffix)); err != nil {
log.Println(err)
http.Error(w, "couldn't open file", http.StatusBadRequest)
} else {
defer file.Close()
t.execute(file, w)
}
}
}
const maxSnippetSize = 64 * 1024
func (t Tool) save() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(io.LimitReader(r.Body, maxSnippetSize))
if err != nil {
log.Println(err)
http.Error(w, "body too large", http.StatusBadRequest)
return
}
r.Body.Close()
// Create a filename taking the first 10 characters of the sha1-sum of
// content. Based on code from the golang-playground.
h := sha1.New()
io.Copy(h, bytes.NewBuffer(body))
sum := h.Sum(nil)
b := make([]byte, base64.URLEncoding.EncodedLen(len(sum)))
base64.URLEncoding.Encode(b, sum)
name := string(b)[:10]
// Write snippet to file. TODO: Shall we return error if file exists?
if file, err := os.Create(filepath.Join(*savedir, name+t.Suffix)); err != nil {
log.Println(err)
http.Error(w, "couldn't create file", http.StatusInternalServerError)
} else if err = file.Chmod(0644); err != nil {
log.Println(err)
http.Error(w, "couldn't setup file", http.StatusInternalServerError)
} else if _, err = io.Copy(file, bytes.NewBuffer(body)); err != nil {
log.Println(err)
http.Error(w, "couldn't write file", http.StatusInternalServerError)
} else if err = file.Close(); err != nil {
log.Println(err)
http.Error(w, "couldn't close file", http.StatusInternalServerError)
}
w.Write([]byte(name))
}
}
func (t Tool) load() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
name := filepath.Base(r.URL.Path)
if file, err := os.Open(filepath.Join(*savedir, name+t.Suffix)); err != nil {
log.Println(err)
http.Error(w, "couldn't open file", http.StatusBadRequest)
} else {
defer file.Close()
io.Copy(w, file)
}
}
}
func (t Tool) index() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if tmpl, err := template.ParseFiles("index.html"); err != nil {
log.Printf("error parsing index.html: %v", err)
http.Error(w, "internal error", http.StatusInternalServerError)
} else if err = tmpl.ExecuteTemplate(w, "index.html", map[string]interface{}{"Tools": tools, "Cur": t}); err != nil {
log.Printf("error executing template for %s: %v", t.Name, err)
}
}
}
func main() {
flag.Parse()
if cfg, err := os.Open(*config); err != nil {
log.Fatal(err)
} else if err = json.NewDecoder(cfg).Decode(&tools); err != nil {
log.Fatalf("error loading %s: %v\n", *config, err)
}
for _, tool := range tools {
pre := "/" + tool.Name + "/"
http.HandleFunc(pre+"c", tool.compile())
http.HandleFunc(pre+"s", tool.save())
http.HandleFunc(pre+"l/", tool.load())
http.HandleFunc(pre+"svg/", tool.svg())
http.HandleFunc(pre, tool.index())
log.Println("handler for", pre, "registered")
}
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/"+tools[0].Name, http.StatusFound)
})
if len(*nontls) > 0 {
log.Println("listening non-tls on", *nontls)
log.Fatal(http.ListenAndServe(*nontls, nil))
}
log.Println("listening tls on", *tls)
log.Fatal(http.ListenAndServeTLS(*tls, *cert, *key, nil))
}
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