1package app
 2
 3import (
 4	"log"
 5	"net/http"
 6	"regexp"
 7	"strconv"
 8	"text/template"
 9
10	g "github.com/birabittoh/gopipe/src/globals"
11)
12
13const (
14	fmtYouTubeURL = "https://www.youtube.com/watch?v=%s"
15	err500        = "Internal Server Error"
16)
17
18var (
19	templates      = template.Must(template.ParseGlob("templates/*.html"))
20	userAgentRegex = regexp.MustCompile(`(?i)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`)
21	videoRegex     = regexp.MustCompile(`(?i)^[a-z0-9_-]{11}$`)
22)
23
24func indexHandler(w http.ResponseWriter, r *http.Request) {
25	err := templates.ExecuteTemplate(w, "index.html", nil)
26	if err != nil {
27		log.Println("indexHandler ERROR: ", err)
28		http.Error(w, err500, http.StatusInternalServerError)
29		return
30	}
31}
32
33func videoHandler(w http.ResponseWriter, r *http.Request) {
34	videoID := r.URL.Query().Get("v")
35	if videoID == "" {
36		videoID = r.PathValue("videoID")
37		if videoID == "" {
38			http.Error(w, "Missing video ID", http.StatusBadRequest)
39			return
40		}
41	}
42
43	if !userAgentRegex.MatchString(r.UserAgent()) {
44		log.Println("Regex did not match. UA: ", r.UserAgent())
45		if !g.Debug {
46			log.Println("Redirecting.")
47			http.Redirect(w, r, getURL(videoID), http.StatusFound)
48			return
49		}
50	}
51
52	if !videoRegex.MatchString(videoID) {
53		log.Println("Invalid video ID: ", videoID)
54		http.Error(w, "Invalid video ID.", http.StatusBadRequest)
55		return
56	}
57
58	formatID, err := strconv.ParseUint(r.PathValue("formatID"), 10, 64)
59	if err != nil {
60		formatID = 0
61	}
62
63	video, format, err := getVideo(videoID, int(formatID))
64	if err != nil {
65		http.Error(w, err500, http.StatusInternalServerError)
66		return
67	}
68
69	if video == nil || format == nil {
70		http.Error(w, err500, http.StatusInternalServerError)
71		return
72	}
73
74	data := map[string]interface{}{
75		"VideoID":     videoID,
76		"VideoURL":    format.URL,
77		"Uploader":    video.Author,
78		"Title":       video.Title,
79		"Description": video.Description,
80		"Duration":    video.Duration,
81		"Debug":       g.Debug,
82	}
83
84	err = templates.ExecuteTemplate(w, "video.html", data)
85	if err != nil {
86		log.Println("indexHandler ERROR: ", err)
87		http.Error(w, err500, http.StatusInternalServerError)
88		return
89	}
90}