178 lines
4.2 KiB
Go
178 lines
4.2 KiB
Go
package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"io"
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"math/rand"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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var (
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domain string
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listenAddr string
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staticDir string
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expireDur time.Duration
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expireOnView bool
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)
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type meta struct {
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Expiry time.Time `json:"expiry"`
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ExpireOnView bool `json:"expire_on_view"`
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}
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func randomID(n int) string {
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letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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b := make([]rune, n)
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for i := range b {
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b[i] = letters[rand.Intn(len(letters))]
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}
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return string(b)
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}
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func indexHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Add("Content-Type", "text/html")
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fmt.Fprintf(w, `<html><body><pre>Welcome to slenpaste!
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Upload via curl:
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curl -F 'file=@yourfile.txt' http://%s/
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Or via wget:
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wget --method=POST --body-file=yourfile.txt http://%s/
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</pre>
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<form enctype="multipart/form-data" method="post">
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<input type="file" name="file">
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<fieldset style="margin-top: 1rem">
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<legend>Expiry:</legend>
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<label><input type="radio" name="expiry" value="0" checked> Never</label>
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<label><input type="radio" name="expiry" value="5m"> 5 minutes</label>
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<label><input type="radio" name="expiry" value="1h"> 1 hour</label>
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<label><input type="radio" name="expiry" value="24h"> 1 day</label>
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<label><input type="radio" name="expiry" value="view"> Expire on first view</label>
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</fieldset><br/>
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<input type="submit" value="Upload">
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</form>
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</body></html>`, domain, domain)
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}
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func uploadHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Error(w, "Only POST allowed", http.StatusMethodNotAllowed)
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return
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}
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var reader io.Reader
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if err := r.ParseMultipartForm(10 << 20); err == nil {
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if file, _, err := r.FormFile("file"); err == nil {
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defer file.Close()
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reader = file
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}
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}
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if reader == nil {
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reader = r.Body
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defer r.Body.Close()
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}
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expVal := r.FormValue("expiry")
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var dur time.Duration
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var onView bool
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switch expVal {
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case "view":
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onView = true
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case "0":
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// no expiry
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default:
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dur, _ = time.ParseDuration(expVal)
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}
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id := randomID(6)
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if err := os.MkdirAll(staticDir, 0755); err != nil {
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http.Error(w, "Server error", http.StatusInternalServerError)
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return
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}
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path := filepath.Join(staticDir, id)
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out, err := os.Create(path)
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if err != nil {
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http.Error(w, "Save error", http.StatusInternalServerError)
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return
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}
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defer out.Close()
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if _, err := io.Copy(out, reader); err != nil {
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http.Error(w, "Write error", http.StatusInternalServerError)
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return
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}
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if dur > 0 || onView {
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m := meta{ExpireOnView: onView}
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if dur > 0 {
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m.Expiry = time.Now().Add(dur)
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}
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metaBytes, _ := json.Marshal(m)
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_ = os.WriteFile(path+".json", metaBytes, 0644)
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}
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fmt.Fprintf(w, "http://%s/%s\n", domain, id)
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}
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func viewHandler(w http.ResponseWriter, r *http.Request) {
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id := strings.TrimPrefix(r.URL.Path, "/")
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if id == "" {
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indexHandler(w, r)
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return
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}
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path := filepath.Join(staticDir, id)
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metaPath := path + ".json"
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// load and enforce metadata
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if data, err := os.ReadFile(metaPath); err == nil {
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var m meta
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if err := json.Unmarshal(data, &m); err == nil {
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if !m.Expiry.IsZero() && time.Now().After(m.Expiry) {
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os.Remove(path)
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os.Remove(metaPath)
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http.NotFound(w, r)
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return
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}
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if m.ExpireOnView {
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defer os.Remove(path)
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defer os.Remove(metaPath)
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}
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}
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}
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f, err := os.Open(path)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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defer f.Close()
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w.Header().Set("Content-Type", "text/plain")
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io.Copy(w, f)
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}
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func main() {
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flag.StringVar(&domain, "domain", "localhost", "domain name for URLs")
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flag.StringVar(&listenAddr, "listen", "0.0.0.0:8080", "listen address")
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flag.StringVar(&staticDir, "static", "static", "directory to save pastes")
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flag.DurationVar(&expireDur, "expire", 0, "time after which paste expires (e.g. 5m, 1h)")
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flag.BoolVar(&expireOnView, "expire-on-view", false, "delete paste after it's viewed once")
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flag.Parse()
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if r.Method == http.MethodPost {
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uploadHandler(w, r)
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} else {
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viewHandler(w, r)
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}
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})
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fmt.Printf("slenpaste running at http://%s, storing in %s\n", listenAddr, staticDir)
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http.ListenAndServe(listenAddr, nil)
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}
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