@@ -13,7 +13,7 @@ COPY src ./src
 COPY *.go ./
 
 # Build
-RUN CGO_ENABLED=0 go build -trimpath -o /dist/fixyoutube
+RUN CGO_ENABLED=0 go build -trimpath -o /dist/gopipe
 
 # Test
 FROM build-stage AS run-test-stage
@@ -27,4 +27,4 @@ COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /dist .
 COPY templates ./templates
 
-ENTRYPOINT ["./fixyoutube"]
+ENTRYPOINT ["./gopipe"]

@@ -1,4 +1,4 @@
-# FixYouTube
+# GoPipe
 Embed YouTube videos on Telegram, Discord and more!
 
 ## How to use:

@@ -2,7 +2,7 @@ services:
   app:
     build: .
     image: ghcr.io/birabittoh/gopipe:main
-    container_name: fixyoutube
+    container_name: gopipe
     restart: unless-stopped
     ports:
       - 3000:3000

@@ -2,7 +2,7 @@ services:
   app:
     build: .
     image: ghcr.io/birabittoh/gopipe:main
-    container_name: fixyoutube
+    container_name: gopipe
     restart: unless-stopped
     env_file:
       - .env
@@ -15,7 +15,7 @@ env_file:
       - docker/swag.env
     volumes:
         #- /etc/config/swag:/config
-        - ./docker/fixyoutube.subdomain.conf:/config/nginx/proxy-confs/fixyoutube.subdomain.conf:ro
+        - ./docker/gopipe.subdomain.conf:/config/nginx/proxy-confs/gopipe.subdomain.conf:ro
     ports:
         - 443:443
         - 80:80

@@ -10,8 +10,11 @@
 	g "github.com/birabittoh/gopipe/src/globals"
 )
 
-const err500 = "Internal Server Error"
-const urlDuration = 6 * time.Hour
+const (
+	fmtYouTubeURL = "https://www.youtube.com/watch?v=%s"
+	err500        = "Internal Server Error"
+	urlDuration   = 6 * time.Hour
+)
 
 var (
 	templates      = template.Must(template.ParseGlob("templates/*.html"))
@@ -38,13 +41,11 @@ return
 		}
 	}
 
-	url := "https://www.youtube.com/watch?v=" + videoID
-
 	if !userAgentRegex.MatchString(r.UserAgent()) {
-		log.Println("Regex did not match.")
+		log.Println("Regex did not match. UA: ", r.UserAgent())
 		if !g.Debug {
-			log.Println("Redirecting. UA:", r.UserAgent())
-			http.Redirect(w, r, url, http.StatusFound)
+			log.Println("Redirecting.")
+			http.Redirect(w, r, getURL(videoID), http.StatusFound)
 			return
 		}
 	}
@@ -55,26 +56,15 @@ http.Error(w, "Invalid video ID.", http.StatusBadRequest)
 		return
 	}
 
-	video, err := g.YT.GetVideo(url)
+	video, format, err := getVideo(videoID)
 	if err != nil {
-		log.Println("videoHandler ERROR: ", err)
 		http.Error(w, err500, http.StatusInternalServerError)
 		return
 	}
 
-	formats := video.Formats.WithAudioChannels()
-	if len(formats) == 0 {
-		log.Println("videoHandler ERROR: ", err)
-		http.Error(w, err500, http.StatusInternalServerError)
-		return
-	}
-
-	// TODO: check formats[i].ContentLength
-	// g.KS.Set(videoID, formats[0].URL, urlDuration)
-
 	data := map[string]interface{}{
 		"VideoID":     videoID,
-		"VideoURL":    formats[0].URL,
+		"VideoURL":    format.URL,
 		"Uploader":    video.Author,
 		"Title":       video.Title,
 		"Description": video.Description,

@@ -0,0 +1,99 @@
+package app
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"regexp"
+	"strconv"
+	"time"
+
+	g "github.com/birabittoh/gopipe/src/globals"
+	"github.com/kkdai/youtube/v2"
+)
+
+const (
+	maxMB                = 20
+	maxContentLength     = maxMB * 1048576
+	defaultCacheDuration = 6 * time.Hour
+)
+
+var (
+	emptyVideo  = youtube.Video{}
+	expireRegex = regexp.MustCompile(`(?i)expire=(\d+)`)
+)
+
+func parseExpiration(url string) (time.Duration, error) {
+	expireString := expireRegex.FindStringSubmatch(url)
+	expireTimestamp, err := strconv.ParseInt(expireString[1], 10, 64)
+	if err != nil {
+		log.Println("parseExpiration ERROR: ", err)
+		return time.Duration(0), err
+	}
+
+	return time.Until(time.Unix(expireTimestamp, 0)), nil
+}
+
+func formatsSelectFn(f youtube.Format) bool {
+	return f.AudioChannels > 1 && f.ContentLength < maxContentLength
+}
+
+func getURL(videoID string) string {
+	return fmt.Sprintf(fmtYouTubeURL, videoID)
+}
+
+func getFromCache(videoID string) (video *youtube.Video, format youtube.Format, err error) {
+	video, err = g.KS.Get(videoID)
+	if err != nil {
+		return
+	}
+
+	if video == nil {
+		err = errors.New("video should not be nil")
+		return
+	}
+
+	if video.ID == emptyVideo.ID {
+		err = errors.New("no formats for this video")
+		return
+	}
+
+	formats := video.Formats.Select(formatsSelectFn)
+	if len(formats) == 0 {
+		err = errors.New("no formats for this video")
+		return
+	}
+
+	format = formats[0]
+	return
+}
+
+func getFromYT(videoID string) (video *youtube.Video, format youtube.Format, err error) {
+	video, err = g.YT.GetVideo(getURL(videoID))
+	if err != nil {
+		return
+	}
+
+	formats := video.Formats.Select(formatsSelectFn)
+	if len(formats) == 0 {
+		g.KS.Set(videoID, emptyVideo, defaultCacheDuration)
+		return
+	}
+
+	format = formats[0]
+	expiration, err := parseExpiration(format.URL)
+	if err != nil {
+		expiration = defaultCacheDuration
+	}
+
+	g.KS.Set(videoID, *video, expiration)
+	return
+}
+
+func getVideo(videoID string) (video *youtube.Video, format youtube.Format, err error) {
+	video, format, err = getFromCache(videoID)
+	if err != nil {
+		video, format, err = getFromYT(videoID)
+	}
+	return
+}

@@ -1,6 +1,8 @@
 package globals
 
 import (
+	"time"
+
 	"github.com/birabittoh/myks"
 	"github.com/kkdai/youtube/v2"
 )
@@ -10,5 +12,5 @@ Debug bool
 	Port  string
 
 	YT = youtube.Client{}
-	KS = myks.New[string](0)
+	KS = myks.New[youtube.Video](3 * time.Hour)
 )

@@ -1,5 +1,5 @@
-# make sure that your app container is named fixyoutube
-# make sure that your dns has a cname set for fixyoutube
+# make sure that your app container is named gopipe
+# make sure that your dns has a cname set for gopipe
 
 server {
     listen 443 ssl;
@@ -15,7 +15,7 @@
     location / {
         include /config/nginx/proxy.conf;
         include /config/nginx/resolver.conf;
-        set $upstream_app fixyoutube;
+        set $upstream_app gopipe;
         set $upstream_port 3000;
         set $upstream_proto http;
         proxy_pass $upstream_proto://$upstream_app:$upstream_port;

@@ -4,10 +4,10 @@
 <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
-    <meta property="og:title" content="FixYouTube" />
-    <meta property="og:site_name" content="FixYouTube" />
+    <meta property="og:title" content="GoTube" />
+    <meta property="og:site_name" content="GoTube" />
     <meta property="og:description" content="Embed YouTube videos on Telegram, Discord and more!" />
-    <title>FixYouTube</title>
+    <title>GoTube</title>
 
     <link rel="icon"
         href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text fill=%22white%22 y=%22.9em%22 font-size=%2290%22>🛠</text></svg>">
@@ -17,10 +17,10 @@
 <body>
     <main class="container" style="max-width: 35rem">
         <hgroup>
-            <h1>FixYouTube</h1>
+            <h1>GoTube</h1>
             <h2>Embed YouTube videos on Telegram, Discord and more!</h2>
         </hgroup>
-        <p>FixYouTube serves fixed YouTube video embeds. Heavily inspired by <a href="https://fxtwitter.com">fxtwitter.com</a> and <a href="https://ddinstagram.com">ddinstagram.com</a>.</p>
+        <p>GoTube serves fixed YouTube video embeds. Heavily inspired by <a href="https://fxtwitter.com">fxtwitter.com</a> and <a href="https://ddinstagram.com">ddinstagram.com</a>.</p>
 
         <section>
             <header>

@@ -1,10 +1,10 @@
 <!DOCTYPE html>
 <!--
-███████ ██ ██   ██ ██    ██   ███   ██   ██ ██████ ██   ██ ██████  ███████ 
-██      ██  ██ ██   ██  ██  ██   ██ ██   ██   ██   ██   ██ ██   ██ ██      
-█████   ██   ███     ████   ██   ██ ██   ██   ██   ██   ██ ██████  █████   
-██      ██  ██ ██     ██    ██   ██ ██   ██   ██   ██   ██ ██   ██ ██      
-██      ██ ██   ██    ██      ███     ███     ██     ███   ██████  ███████ 
+███████ ██ ██   ██ ██    ██   ███   ██   ██ ██████ ██   ██ ██████  ███████
+██      ██  ██ ██   ██  ██  ██   ██ ██   ██   ██   ██   ██ ██   ██ ██     
+█████   ██   ███     ████   ██   ██ ██   ██   ██   ██   ██ ██████  █████  
+██      ██  ██ ██     ██    ██   ██ ██   ██   ██   ██   ██ ██   ██ ██     
+██      ██ ██   ██    ██      ███     ███     ██     ███   ██████  ███████
 ██
 ██  A better way to embed YouTube videos on Telegram (inspired by FixTweet).
 ██  -->
@@ -21,7 +21,7 @@ <meta property="twitter:creator" content="{{ .Uploader }}" />
     <meta property="twitter:title" content="{{ .Title }}" />
     <meta property="og:title" content="{{ .Title }}" />
     <meta property="og:description" content="{{ .Description }}" />
-    <meta property="og:site_name" content="FixYouTube ({{ .Uploader }})" />
+    <meta property="og:site_name" content="GoTube ({{ .Uploader }})" />
     <meta property="twitter:image" content="0" />
     <meta property="twitter:player:stream:content_type" content="video/mp4" />
     {{ if .VideoURL }}