mathiasandClaude Opus 4.8
bddd75d92e
Pure parser for watch?v=, youtu.be/, shorts/, embed/, and bare ids; rejects non-YouTube hosts and malformed input. Foundation for paste-a-URL summarize (Feature 2). No fetch, no gate interaction — parsing only. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package web
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import (
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"fmt"
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"net/url"
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"regexp"
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"strings"
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)
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// youtubeVideoID matches a canonical YouTube video id: exactly 11 URL-safe chars.
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var youtubeVideoID = regexp.MustCompile(`^[A-Za-z0-9_-]{11}$`)
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// parseYouTubeVideoID extracts the 11-character video id from a pasted YouTube
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// URL (watch?v=, youtu.be/, shorts/, embed/) or a bare id. It rejects non-YouTube
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// hosts and anything that doesn't yield a valid id, so the paste flow never tries
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// to fetch a video that can't exist (Feature 2).
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func parseYouTubeVideoID(raw string) (string, error) {
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s := strings.TrimSpace(raw)
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if s == "" {
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return "", fmt.Errorf("empty input")
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}
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// Bare id (no URL) — accept directly.
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if youtubeVideoID.MatchString(s) {
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return s, nil
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}
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// Accept scheme-less URLs (youtube.com/watch?v=...) by giving url.Parse a host.
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if !strings.Contains(s, "://") {
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s = "https://" + s
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}
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u, err := url.Parse(s)
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if err != nil {
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return "", fmt.Errorf("not a URL: %w", err)
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}
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host := strings.ToLower(u.Hostname())
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isYouTube := host == "youtu.be" || host == "youtube.com" || strings.HasSuffix(host, ".youtube.com")
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if !isYouTube {
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return "", fmt.Errorf("not a YouTube URL: %q", host)
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}
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var id string
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switch {
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case host == "youtu.be":
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// youtu.be/<id>
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id = strings.Trim(u.Path, "/")
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case u.Path == "/watch":
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id = u.Query().Get("v")
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default:
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// /shorts/<id>, /embed/<id>
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parts := strings.Split(strings.Trim(u.Path, "/"), "/")
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if len(parts) == 2 && (parts[0] == "shorts" || parts[0] == "embed") {
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id = parts[1]
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}
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}
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if !youtubeVideoID.MatchString(id) {
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return "", fmt.Errorf("no YouTube video id in %q", raw)
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}
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return id, nil
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}
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