1package main
  2
  3import (
  4	"bytes"
  5	"html/template"
  6	"log"
  7	"net/http"
  8	"net/url"
  9	"os"
 10	"regexp"
 11	"slices"
 12	"time"
 13
 14	"github.com/BiRabittoh/fixyoutube-go/invidious"
 15	"github.com/gorilla/mux"
 16	"github.com/joho/godotenv"
 17)
 18
 19var templatesDirectory = "templates/"
 20var indexTemplate = template.Must(template.ParseFiles(templatesDirectory + "index.html"))
 21var videoTemplate = template.Must(template.ParseFiles(templatesDirectory + "video.html"))
 22var blacklist = []string{"favicon.ico", "robots.txt"}
 23var userAgentRegex = regexp.MustCompile(`bot|facebook|embed|got|firefox\/92|firefox\/38|curl|wget|go-http|yahoo|generator|whatsapp|preview|link|proxy|vkshare|images|analyzer|index|crawl|spider|python|cfnetwork|node`)
 24var apiKey string
 25
 26func indexHandler(w http.ResponseWriter, r *http.Request) {
 27	buf := &bytes.Buffer{}
 28	err := indexTemplate.Execute(buf, nil)
 29	if err != nil {
 30		http.Error(w, err.Error(), http.StatusInternalServerError)
 31		return
 32	}
 33
 34	buf.WriteTo(w)
 35}
 36
 37func clearHandler(w http.ResponseWriter, r *http.Request) {
 38	if r.Method != http.MethodPost {
 39		http.Redirect(w, r, "/", http.StatusMovedPermanently)
 40		return
 41	}
 42
 43	err := r.ParseForm()
 44	if err != nil {
 45		http.Error(w, err.Error(), http.StatusInternalServerError)
 46		return
 47	}
 48
 49	providedKey := r.PostForm.Get("apiKey")
 50	if providedKey != apiKey {
 51		http.Error(w, "Wrong or missing API key.", http.StatusForbidden)
 52		return
 53	}
 54
 55	invidious.ClearDB()
 56	http.Error(w, "Done.", http.StatusOK)
 57}
 58
 59func videoHandler(videoId string, invidiousClient *invidious.Client, w http.ResponseWriter, r *http.Request) {
 60
 61	res := userAgentRegex.MatchString(r.UserAgent())
 62	if !res {
 63		url := "https://www.youtube.com/watch?v=" + videoId
 64		http.Redirect(w, r, url, http.StatusMovedPermanently)
 65		return
 66	}
 67
 68	video, err := invidiousClient.GetVideo(videoId)
 69	if err != nil {
 70		http.Error(w, err.Error(), http.StatusInternalServerError)
 71		return
 72	}
 73
 74	buf := &bytes.Buffer{}
 75	err = videoTemplate.Execute(buf, video)
 76	if err != nil {
 77		http.Error(w, err.Error(), http.StatusInternalServerError)
 78		return
 79	}
 80	buf.WriteTo(w)
 81}
 82
 83func watchHandler(invidiousClient *invidious.Client) http.HandlerFunc {
 84	return func(w http.ResponseWriter, r *http.Request) {
 85		u, err := url.Parse(r.URL.String())
 86		if err != nil {
 87			http.Error(w, err.Error(), http.StatusInternalServerError)
 88			return
 89		}
 90
 91		videoId := u.Query().Get("v")
 92		videoHandler(videoId, invidiousClient, w, r)
 93	}
 94}
 95
 96func shortHandler(invidiousClient *invidious.Client) http.HandlerFunc {
 97	return func(w http.ResponseWriter, r *http.Request) {
 98		videoId := mux.Vars(r)["videoId"]
 99
100		if slices.Contains(blacklist, videoId) {
101			http.Error(w, "Not a valid ID.", http.StatusBadRequest)
102			return
103		}
104
105		videoHandler(videoId, invidiousClient, w, r)
106	}
107}
108
109func proxyHandler(invidiousClient *invidious.Client) http.HandlerFunc {
110	return func(w http.ResponseWriter, r *http.Request) {
111		videoId := mux.Vars(r)["videoId"]
112
113		invidiousClient.ProxyVideo(videoId, w)
114	}
115}
116
117func main() {
118	err := godotenv.Load()
119	if err != nil {
120		log.Println("Error loading .env file")
121	}
122
123	port := os.Getenv("PORT")
124	if port == "" {
125		port = "3000"
126	}
127
128	apiKey = os.Getenv("API_KEY")
129	if apiKey == "" {
130		apiKey = "itsme"
131	}
132
133	myClient := &http.Client{Timeout: 10 * time.Second}
134	videoapi := invidious.NewClient(myClient)
135
136	r := mux.NewRouter()
137	r.HandleFunc("/", indexHandler)
138	r.HandleFunc("/clear", clearHandler)
139	r.HandleFunc("/watch", watchHandler(videoapi))
140	r.HandleFunc("/{videoId}", shortHandler(videoapi))
141	r.HandleFunc("/proxy/{videoId}", proxyHandler(videoapi))
142	/*
143		// native go implementation (useless until february 2024)
144		r := http.NewServeMux()
145		r.HandleFunc("/watch", watchHandler(videoapi))
146		r.HandleFunc("/{videoId}/", shortHandler(videoapi))
147		r.HandleFunc("/", indexHandler)
148	*/
149	println("Serving on port", port)
150	http.ListenAndServe(":"+port, r)
151}