94 lines
2.3 KiB
Go
Executable file
94 lines
2.3 KiB
Go
Executable file
package main
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import (
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"crypto/sha256"
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"encoding/base64"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"text/template"
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)
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// StreamURL Unexported
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type StreamURL struct {
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URL string
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}
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func index(w http.ResponseWriter, r *http.Request) {
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if r.FormValue("URL") == "" {
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indexTemplate, err := template.ParseFiles(filepath.Join("templates", "index.html"))
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if err != nil {
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log.Fatal(err)
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}
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indexTemplate.Execute(w, nil)
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return
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}
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streamURL := StreamURL{
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URL: r.FormValue("URL"),
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}
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streamTemplate, err := template.ParseFiles(filepath.Join("templates", "stream.html"))
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if err != nil {
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log.Fatal(err)
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}
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streamTemplate.Execute(w, streamURL)
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}
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func stream(w http.ResponseWriter, r *http.Request) {
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if r.FormValue("URL") == "" {
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return
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}
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w.Header().Set("Content-Type", "image/jpeg")
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URL := r.FormValue("URL")
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resp, err := http.Get(URL)
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if err != nil {
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log.Fatal(err)
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}
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img, err := ioutil.ReadAll(resp.Body)
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defer resp.Body.Close()
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// TODO async for this?
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saveStreamInstant(URL, img)
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w.Write([]byte(img))
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}
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func saveStreamInstant(URL string, img []byte) {
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h := sha256.New()
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h.Write([]byte(URL))
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streamDir := base64.URLEncoding.EncodeToString(h.Sum(nil))
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streamStoreDir := filepath.Join(".", "streams", string(streamDir))
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os.MkdirAll(streamStoreDir, os.ModePerm)
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currentStreamInstantPath := filepath.Join(streamStoreDir, "current.jpg")
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_, err := os.Stat(currentStreamInstantPath)
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swap := !os.IsNotExist(err)
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if swap {
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currentStreamInstantPath = filepath.Join(streamStoreDir, "next.jpg")
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}
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err = ioutil.WriteFile(currentStreamInstantPath, img, os.ModePerm)
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if err != nil {
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log.Fatal("Can't write latest stream instant.")
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}
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if swap {
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previousStreamInstantPath := filepath.Join(streamStoreDir, "previous.jpg")
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nextStreamInstantPath := currentStreamInstantPath
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currentStreamInstantPath = filepath.Join(streamStoreDir, "current.jpg")
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err = os.Rename(currentStreamInstantPath, previousStreamInstantPath)
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err = os.Rename(nextStreamInstantPath, currentStreamInstantPath)
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}
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}
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func main() {
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staticFileServer := http.FileServer(http.Dir("./static"))
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http.Handle("/static/", http.StripPrefix("/static/", staticFileServer))
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http.HandleFunc("/", index)
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http.HandleFunc("/stream", stream)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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