From 05f23c53ecd478546d1e8753a3c05397895b582c Mon Sep 17 00:00:00 2001
From: Evan Fiordeliso <evan.fiordeliso@gmail.com>
Date: Fri, 14 Apr 2023 16:07:57 -0400
Subject: [PATCH] Use custom ytdl wrapper

---
 go.mod                      |   2 +
 go.sum                      |   4 +
 web/serve.go                |  29 ++-
 web/views.go                |  19 +-
 web/views/download.html     |  39 +++-
 web/views/index.html        |   2 +-
 web/views/layouts/main.html |   2 +-
 ytdl/data.go                | 441 ++++++++++++++++++++++++++++++++++++
 ytdl/meta.go                |  29 +++
 9 files changed, 559 insertions(+), 8 deletions(-)
 create mode 100644 ytdl/data.go
 create mode 100644 ytdl/meta.go

diff --git a/go.mod b/go.mod
index 83a0341..623c689 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,9 @@ go 1.20
 require (
 	github.com/gofiber/fiber/v2 v2.43.0
 	github.com/gofiber/template v1.8.0
+	github.com/samber/lo v1.38.1
 	github.com/spf13/cobra v1.7.0
+	golang.org/x/exp v0.0.0-20230321023759-10a507213a29
 )
 
 require (
diff --git a/go.sum b/go.sum
index 0747e01..2abc9d1 100644
--- a/go.sum
+++ b/go.sum
@@ -331,6 +331,8 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/sagikazarmark/crypt v0.3.0/go.mod h1:uD/D+6UF4SrIR1uGEv7bBNkNqLGqUr43MRiaGWX1Nig=
+github.com/samber/lo v1.38.1 h1:j2XEAqXKb09Am4ebOg31SpvzUTTs6EN3VfgeLUhPdXM=
+github.com/samber/lo v1.38.1/go.mod h1:+m/ZKRl6ClXCE2Lgf3MsQlWfh4bn1bz6CXEOxnEXnEA=
 github.com/savsgio/dictpool v0.0.0-20221023140959-7bf2e61cea94 h1:rmMl4fXJhKMNWl+K+r/fq4FbbKI+Ia2m9hYBLm2h4G4=
 github.com/savsgio/dictpool v0.0.0-20221023140959-7bf2e61cea94/go.mod h1:90zrgN3D/WJsDd1iXHT96alCoN2KJo6/4x1DZC3wZs8=
 github.com/savsgio/gotils v0.0.0-20220530130905-52f3993e8d6d/go.mod h1:Gy+0tqhJvgGlqnTF8CVGP0AaGRjwBtXs/a5PA0Y3+A4=
@@ -413,6 +415,8 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
+golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
+golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
diff --git a/web/serve.go b/web/serve.go
index 90e4850..245e8e1 100644
--- a/web/serve.go
+++ b/web/serve.go
@@ -1,7 +1,13 @@
 package web
 
 import (
+	"net/url"
+	"sort"
+
 	"github.com/gofiber/fiber/v2"
+	"github.com/samber/lo"
+	"go.fifitido.net/ytdl-web/ytdl"
+	"golang.org/x/exp/slog"
 )
 
 func Serve() error {
@@ -13,10 +19,29 @@ func Serve() error {
 	})
 
 	app.Get("/download", func(c *fiber.Ctx) error {
-		url := c.Get("url")
+		urlBytes, err := url.QueryUnescape(c.Query("url"))
+		if err != nil {
+			slog.Error("Failed to decode url param", slog.String("error", err.Error()))
+			return fiber.ErrBadRequest
+		}
+		url := string(urlBytes)
+
+		meta, err := ytdl.GetMetadata(url)
+		if err != nil {
+			slog.Error("Failed to get metadata", slog.String("error", err.Error()))
+			return fiber.ErrInternalServerError
+		}
+
+		formats := lo.Filter(meta.Formats, func(item ytdl.Format, _ int) bool {
+			return item.ACodec != "none" && item.VCodec != "none"
+		})
+
+		sort.Slice(formats, func(i, j int) bool {
+			return formats[i].Width > formats[j].Width
+		})
 
 		return c.Render("views/download", fiber.Map{
-			"Url": url,
+			"Url": url, "Meta": meta, "Formats": formats,
 		}, "views/layouts/main")
 	})
 
diff --git a/web/views.go b/web/views.go
index e00f59b..488cdfa 100644
--- a/web/views.go
+++ b/web/views.go
@@ -2,8 +2,10 @@ package web
 
 import (
 	"embed"
+	"encoding/json"
 	"html/template"
 	"net/http"
+	"net/url"
 
 	"github.com/gofiber/template/html"
 )
@@ -14,10 +16,23 @@ var viewsfs embed.FS
 func ViewsEngine() *html.Engine {
 	engine := html.NewFileSystem(http.FS(viewsfs), ".html")
 	engine.AddFunc(
-		// add unescape function
-		"unescape", func(s string) template.HTML {
+		"unsafe", func(s string) template.HTML {
 			return template.HTML(s)
 		},
 	)
+	engine.AddFunc(
+		"queryEscape", func(s string) string {
+			return url.QueryEscape(s)
+		},
+	)
+	engine.AddFunc(
+		"jsonMarshal", func(s any) (string, error) {
+			j, err := json.MarshalIndent(s, "", "    ")
+			if err != nil {
+				return "", err
+			}
+			return string(j), nil
+		},
+	)
 	return engine
 }
diff --git a/web/views/download.html b/web/views/download.html
index c55e2e4..860aaae 100644
--- a/web/views/download.html
+++ b/web/views/download.html
@@ -1,2 +1,37 @@
-<h1>Download</h1>
-<p>{{.Url}}</p>
+<div class="d-flex flex-column align-items-center">
+  <h1>Download Video</h1>
+  <h2 class="fs-4 text-muted">{{.Meta.Title}}</h2>
+  <p style="font-size: 0.85rem">{{.Url}}</p>
+  <img
+    src="{{.Meta.Thumbnail}}"
+    alt="{{.Meta.Title}}"
+    style="max-height: 25rem; max-width: 100%"
+  />
+  <a
+    href="/"
+    class="btn btn-secondary btn-sm mt-3"
+    style="width: 30rem; max-width: 100%"
+    >Download Another Video</a
+  >
+</div>
+{{$id := .Meta.ID}} {{$url := .Url}} {{range .Formats}}
+<div class="d-flex gap-3 mt-5 align-items-center">
+  <div style="width: 10rem">{{.Format}}</div>
+  <div class="flex-grow-1 d-flex gap-3">
+    <a
+      class="btn btn-primary flex-grow-1"
+      download="{{$id}}-{{.Resolution}}.{{.Ext}}"
+      href="{{.Url}}"
+    >
+      Download (direct)
+    </a>
+    <a
+      class="btn btn-primary flex-grow-1"
+      download="{{$id}}-{{.Resolution}}.{{.Ext}}"
+      href="/download/proxy?url={{queryEscape $url}}&format={{.FormatID}}"
+    >
+      Download (proxied)
+    </a>
+  </div>
+</div>
+{{end}}
diff --git a/web/views/index.html b/web/views/index.html
index f8856bd..bc04b9c 100644
--- a/web/views/index.html
+++ b/web/views/index.html
@@ -7,7 +7,7 @@
   <div class="mb-3">
     <label for="url" class="form-label visually-hidden">Url</label>
     <div class="input-group">
-      <input type="url" name="url" id="url" class="form-control" />
+      <input type="url" name="url" id="url" class="form-control" required />
       <button
         id="paste-button"
         class="btn btn-outline-secondary"
diff --git a/web/views/layouts/main.html b/web/views/layouts/main.html
index 1d98f9c..fde39f2 100644
--- a/web/views/layouts/main.html
+++ b/web/views/layouts/main.html
@@ -46,7 +46,7 @@
   </head>
   <body data-bs-theme="dark">
     {{template "views/partials/navbar" .}}
-    <main class="container mt-5">{{embed}}</main>
+    <main class="container my-5">{{embed}}</main>
     <script>
       const pasteButton = document.getElementById("paste-button");
       const urlField = document.getElementById("url");
diff --git a/ytdl/data.go b/ytdl/data.go
new file mode 100644
index 0000000..bbd6ff2
--- /dev/null
+++ b/ytdl/data.go
@@ -0,0 +1,441 @@
+package ytdl
+
+type Metdata struct {
+	// Video identifier.
+	ID string `json:"id"`
+
+	// Video title, unescaped. Set to an empty string if video has
+	// no title as opposed to "None" which signifies that the
+	// extractor failed to obtain a title
+	Title *string `json:"title"`
+
+	// A list of dictionaries for each format available, ordered
+	// from worst to best quality.
+	Formats []Format `json:"formats"`
+
+	// Final video URL.
+	Url string `json:"url"`
+
+	// Video filename extension.
+	Ext string `json:"ext"`
+
+	// The video format, defaults to ext (used for --get-format)
+	Format string `json:"format"`
+
+	// True if a direct video file was given (must only be set by GenericIE)
+	Direct *bool `json:"direct"`
+
+	// A secondary title of the video.
+	AltTitle *string `json:"alt_title"`
+
+	// An alternative identifier for the video, not necessarily
+	// unique, but available before title. Typically, id is
+	// something like "4234987", title "Dancing naked mole rats",
+	// and display_id "dancing-naked-mole-rats"
+	DisplayID *string `json:"display_id"`
+
+	Thumbnails []Thumbnail `json:"thumbnails"`
+
+	// Full URL to a video thumbnail image.
+	Thumbnail *string `json:"thumbnail"`
+
+	// Full video description.
+	Description *string `json:"description"`
+
+	// Full name of the video uploader.
+	Uploader *string `json:"uploader"`
+
+	// License name the video is licensed under.
+	License *string `json:"license"`
+
+	// The creator of the video.
+	Creator *string `json:"creator"`
+
+	// UNIX timestamp of the moment the video was uploaded
+	Timestamp *int64 `json:"timestamp"`
+
+	// Video upload date in UTC (YYYYMMDD).
+	// If not explicitly set, calculated from timestamp
+	UploadDate *string `json:"upload_date"`
+
+	// UNIX timestamp of the moment the video was released.
+	// If it is not clear whether to use timestamp or this, use the former
+	ReleaseTimestamp *int64 `json:"release_timestamp"`
+
+	// The date (YYYYMMDD) when the video was released in UTC.
+	// If not explicitly set, calculated from release_timestamp
+	ReleaseDate *string `json:"release_date"`
+
+	// UNIX timestamp of the moment the video was last modified.
+	ModifiedTimestamp *int64 `json:"modified_timestamp"`
+
+	// The date (YYYYMMDD) when the video was last modified in UTC.
+	// If not explicitly set, calculated from modified_timestamp
+	ModifiedDate *string `json:"modified_date"`
+
+	// Nickname or id of the video uploader.
+	UploaderId *string `json:"uploader_id"`
+
+	// Full URL to a personal webpage of the video uploader.
+	UploaderUrl *string `json:"uploader_url"`
+
+	// Full name of the channel the video is uploaded on.
+	// Note that channel fields may or may not repeat uploader
+	// fields. This depends on a particular extractor.
+	Channel *string `json:"channel"`
+
+	// Id of the channel.
+	ChannelId *string `json:"channel_id"`
+
+	// Full URL to a channel webpage.
+	ChannelUrl *string `json:"channel_url"`
+
+	// Number of followers of the channel.
+	ChannelFollowerCount *int `json:"channel_follower_count"`
+
+	// Physical location where the video was filmed.
+	Location *string `json:"location"`
+
+	// The available subtitles as a dictionary in the format
+	// {tag: subformats}. "tag" is usually a language code, and
+	// "subformats" is a list sorted from lower to higher
+	// preference
+	Subtitles map[string][]Subtitle `json:"subtitles"`
+
+	// Like 'subtitles'; contains automatically generated
+	// captions instead of normal subtitles
+	AutomaticCaptions map[string][]Subtitle `json:"automatic_captions"`
+
+	// Length of the video in seconds, as an integer or float.
+	Duration *float64 `json:"duration"`
+
+	// How many users have watched the video on the platform.
+	ViewCount *int64 `json:"view_count"`
+
+	// How many users are currently watching the video on the platform.
+	ConcurrentViewCount *int64 `json:"concurrent_view_count"`
+
+	// Number of positive ratings of the video
+	LikeCount *int64 `json:"like_count"`
+
+	// Number of negative ratings of the video
+	DislikeCount *int64 `json:"dislike_count"`
+
+	// Number of reposts of the video
+	RepostCount *int64 `json:"repost_count"`
+
+	// Average rating give by users, the scale used depends on the webpage
+	AverageRating *float64 `json:"average_rating"`
+
+	// Number of comments on the video
+	CommentCount *int64 `json:"comment_count"`
+
+	// A list of comments
+	Comments []Comment `json:"comments"`
+
+	// Age restriction for the video, as an integer (years)
+	AgeLimit *int `json:"age_limit"`
+
+	// The URL to the video webpage, if given to yt-dlp it
+	// should allow to get the same result again. (It will be set
+	// by YoutubeDL if it's missing)
+	WebpageUrl *string `json:"webpage_url"`
+
+	// A list of categories that the video falls in
+	Categories []string `json:"categories"`
+
+	// A list of tags assigned to the video
+	Tags []string `json:"tags"`
+
+	// A list of the video cast
+	Cast []string `json:"cast"`
+
+	// Whether this video is a live stream that goes on instead of a fixed-length video.
+	IsLive *bool `json:"is_live"`
+
+	// Whether this video was originally a live stream.
+	WasLive *bool `json:"was_live"`
+
+	// None (=unknown), 'is_live', 'is_upcoming', 'was_live', 'not_live',
+	// or 'post_live' (was live, but VOD is not yet processed)
+	// If absent, automatically set from is_live, was_live
+	LiveStatus *string `json:"live_status"`
+
+	// Time in seconds where the reproduction should start, as
+	// specified in the URL.
+	StartTime *int64 `json:"start_time"`
+
+	// Time in seconds where the reproduction should end, as
+	// specified in the URL.
+	EndTime *int64 `json:"end_time"`
+
+	Chapters []Chapter `json:"chapters"`
+}
+
+type Format struct {
+	// The mandatory URL representing the media:
+	//   for plain file media - HTTP URL of this file,
+	//   for RTMP - RTMP URL,
+	//   for HLS - URL of the M3U8 media playlist,
+	//   for HDS - URL of the F4M manifest,
+	//   for DASH
+	//     - HTTP URL to plain file media (in case of
+	//   	unfragmented media)
+	//     - URL of the MPD manifest or base URL
+	// 	  representing the media if MPD manifest
+	//   	is parsed from a string (in case of
+	//   	fragmented media)
+	//   for MSS - URL of the ISM manifest.
+	Url string `json:"url"`
+
+	// Will be calculated from URL if missing
+	Ext string `json:"ext"`
+
+	// A human-readable description of the format
+	// ("mp4 container with h264/opus").
+	// Calculated from the format_id, width, height.
+	// and format_note fields if missing.
+	Format string `json:"format"`
+
+	// A short description of the format
+	// ("mp4_h264_opus" or "19").
+	// Technically optional, but strongly recommended.
+	FormatID string `json:"format_id"`
+
+	// Additional info about the format
+	// ("3D" or "DASH video")
+	FormatNote string `json:"format_note"`
+
+	// Width of the video, if known
+	Width int `json:"width"`
+
+	// Height of the video, if known
+	Height int `json:"height"`
+
+	// Aspect ratio of the video, if known
+	// Automatically calculated from width and height
+	AspectRatio float64 `json:"aspect_ratio"`
+
+	// Textual description of width and height
+	// Automatically calculated from width and height
+	Resolution string `json:"resolution"`
+
+	// The dynamic range of the video. One of:
+	// "SDR" (None), "HDR10", "HDR10+, "HDR12", "HLG, "DV"
+	DynamicRange string `json:"dynamic_range"`
+
+	// Average bitrate of audio and video in KBit/s
+	Tbr float64 `json:"tbr"`
+
+	// Average audio bitrate in KBit/s
+	Abr float64 `json:"abr"`
+
+	// Average video bitrate in KBit/s
+	Vbr float64 `json:"vbr"`
+
+	// Name of the audio codec in use
+	ACodec string `json:"acodec"`
+
+	// Name of the video codec in use
+	VCodec string `json:"vcodec"`
+
+	// Number of audio channels
+	AudioChannels int `json:"audio_channels"`
+
+	// Frame rate
+	Fps float64 `json:"fps"`
+
+	// Name of the container format
+	Container string `json:"container"`
+
+	// The number of bytes, if known in advance
+	Filesize *int `json:"filesize"`
+
+	// An estimate for the number of bytes
+	FilesizeApprox int `json:"filesize_approx"`
+
+	// The protocol that will be used for the actual
+	// download, lower-case. One of "http", "https" or
+	// one of the protocols defined in downloader.PROTOCOL_MAP
+	Protocol string `json:"protocol"`
+
+	// Base URL for fragments. Each fragment's path
+	// value (if present) will be relative to
+	// this URL.
+	FragmentBaseUrl *string `json:"fragment_base_url"`
+
+	// A list of fragments of a fragmented media.
+	// Each fragment entry must contain either an url
+	// or a path. If an url is present it should be
+	// considered by a client. Otherwise both path and
+	// fragment_base_url must be present.
+	Fragments []Fragment `json:"fragments"`
+
+	// Is a live format that can be downloaded from the start.
+	IsFromStart bool `json:"is_from_start"`
+
+	// Order number of this format. If this field is
+	// present and not None, the formats get sorted
+	// by this field, regardless of all other values.
+	// -1 for default (order by other properties),
+	// -2 or smaller for less than default.
+	// < -1000 to hide the format (if there is
+	//    another one which is strictly better)
+	Preference *int `json:"preference"`
+
+	// Language code, e.g. "de" or "en-US".
+	Language string `json:"language"`
+
+	// Is this in the language mentioned in
+	// the URL?
+	// 10 if it's what the URL is about,
+	// -1 for default (don't know),
+	// -10 otherwise, other values reserved for now.
+	LanguagePreference int `json:"language_preference"`
+
+	// Order number of the video quality of this
+	// format, irrespective of the file format.
+	// -1 for default (order by other properties),
+	// -2 or smaller for less than default.
+	Quality float64 `json:"quality"`
+
+	// Order number for this video source
+	// 	(quality takes higher priority)
+	// 	-1 for default (order by other properties),
+	// 	-2 or smaller for less than default.
+	SourcePreference int `json:"source_preference"`
+
+	// A dictionary of additional HTTP headers to add to the request.
+	HttpHeaders map[string]string `json:"http_header"`
+
+	// If given and not 1, indicates that the
+	// video's pixels are not square.
+	// width : height ratio as float.
+	StretchedRatio *float64 `json:"stretched_ratio"`
+
+	// The server does not support resuming the (HTTP or RTMP) download.
+	NoResume bool `json:"no_resume"`
+
+	// The format has DRM and cannot be downloaded.
+	HasDrm bool `json:"has_drm"`
+
+	// A query string to append to each
+	// fragment's URL, or to update each existing query string
+	// with. Only applied by the native HLS/DASH downloaders.
+	ExtraParamToSegmentUrl string `json:"extra_param_to_segment_url"`
+
+	// A dictionary of HLS AES-128 decryption information
+	// used by the native HLS downloader to override the
+	// values in the media playlist when an '#EXT-X-KEY' tag
+	// is present in the playlist
+	HlsAes *HlsAes `json:"hls_aes"`
+}
+
+type Fragment struct {
+	// fragment's URL
+	Url string `json:"url"`
+
+	// fragment's path relative to fragment_base_url
+	Path string `json:"path"`
+
+	Duration *float64 `json:"duration"`
+	Filesize *int     `json:"filesize"`
+}
+
+type HlsAes struct {
+	// The URI from which the key will be downloaded
+	Uri string `json:"uri"`
+
+	// The key (as hex) used to decrypt fragments.
+	// If `key` is given, any key URI will be ignored
+	Key string `json:"key"`
+
+	// The IV (as hex) used to decrypt fragments
+	Iv string `json:"iv"`
+}
+
+type Thumbnail struct {
+	// Thumbnail format ID
+	ID *string `json:"id"`
+
+	Url string `json:"url"`
+
+	// Quality of the image
+	Preference *int `json:"preference"`
+
+	Width    *int `json:"width"`
+	Height   *int `json:"height"`
+	Filesize *int `json:"filesize"`
+
+	// HTTP headers for the request
+	HttpHeaders map[string]string `json:"http_headers"`
+}
+
+type Subtitle struct {
+	// Will be calculated from URL if missing
+	Ext string `json:"ext"`
+
+	// The subtitles file contents
+	Data string `json:"data"`
+
+	// A URL pointing to the subtitles file
+	Url string `json:"url"`
+
+	// Name or description of the subtitles
+	Name string `json:"name"`
+
+	// A dictionary of additional HTTP headers to add to the request.
+	HttpHeaders map[string]string `json:"http_headers"`
+}
+
+type Comment struct {
+	// human-readable name of the comment author
+	Author *string `json:"author"`
+
+	// user ID of the comment author
+	AuthorID *string `json:"author_id"`
+
+	// The thumbnail of the comment author
+	AuthorThumbnail *string `json:"author_thumbnail"`
+
+	// Comment ID
+	ID *string `json:"id"`
+
+	// Comment as HTML
+	HTML *string `json:"html"`
+
+	// Plain text of the comment
+	Text *string `json:"text"`
+
+	// UNIX timestamp of comment
+	Timestamp *int64 `json:"timestamp"`
+
+	// ID of the comment this one is replying to.
+	// Set to "root" to indicate that this is a
+	// comment to the original video.
+	Parent string `json:"parent"`
+
+	// Number of positive ratings of the comment
+	LikeCount *int64 `json:"like_count"`
+
+	// Number of negative ratings of the comment
+	DislikeCount *int64 `json:"dislike_count"`
+
+	// Whether the comment is marked as
+	// favorite by the video uploader
+	IsFavorited bool `json:"is_favorited"`
+
+	// Whether the comment is made by
+	// the video uploader
+	AuthorIsUploader bool `json:"author_is_uploader"`
+}
+
+type Chapter struct {
+	// The start time of the chapter in seconds
+	StartTime int64 `json:"start_time"`
+
+	// The end time of the chapter in seconds
+	EndTime int64 `json:"end_time"`
+
+	Title *string `json:"title"`
+}
diff --git a/ytdl/meta.go b/ytdl/meta.go
new file mode 100644
index 0000000..06a13db
--- /dev/null
+++ b/ytdl/meta.go
@@ -0,0 +1,29 @@
+package ytdl
+
+import (
+	"bytes"
+	"encoding/json"
+	"os/exec"
+)
+
+func GetMetadata(url string) (Metdata, error) {
+	cmd := exec.Command(
+		"yt-dlp",
+		"-J",
+		url,
+	)
+
+	var out bytes.Buffer
+	cmd.Stdout = &out
+
+	if err := cmd.Run(); err != nil {
+		return Metdata{}, nil
+	}
+
+	var meta Metdata
+	if err := json.Unmarshal(out.Bytes(), &meta); err != nil {
+		return Metdata{}, err
+	}
+
+	return meta, nil
+}