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Taylor HoandGitHub
7eb8cc5a5f
**Category:** fix **User Impact:** YouTube video links now resolve into reliable previews instead of intermittently appearing as bare links. **Problem:** Buzz intentionally reads at most **256 KiB** of page HTML when building a generic link preview. The YouTube response that exposed this bug was roughly **1.3 MiB**, with its Open Graph metadata beginning around **686 KiB**—well beyond Buzz's bounded read—so extraction returned no usable preview. YouTube can move that metadata between responses, which explains why the same link may appear to work in one build or request and fail in another; raising the generic cap would increase bandwidth and allocation for every site while still scraping an unstable application document. **Solution:** Route recognized YouTube video URLs through YouTube's structured oEmbed endpoint instead of parsing raw watch-page HTML. The provider response is capped at **64 KiB** and retains Buzz's existing HTTPS validation, pinned DNS/SSRF protection, disabled redirects, timeouts, metadata bounds, and thumbnail sanitization. Provider failures return no preview rather than falling back to fragile HTML scraping, and embed URLs are canonicalized safely, including percent-encoded video IDs. <details> <summary>File changes</summary> **desktop/src-tauri/src/commands/link_preview.rs** Recognizes supported YouTube URL forms, fetches bounded JSON metadata from YouTube oEmbed, canonicalizes embed links, and adds response, URL-boundary, malformed-data, resource-limit, and encoded-ID regressions. **desktop/src-tauri/Cargo.toml** Declares percent decoding as a direct desktop dependency for safe embed-ID canonicalization. **desktop/src-tauri/Cargo.lock** Records the direct dependency in the desktop package lock entry. </details> ## Reproduction Steps 1. On the base branch, paste a YouTube URL whose Open Graph metadata falls beyond the first 256 KiB of the raw watch-page response and observe that no preview is produced. 2. Run this branch and paste a YouTube watch, mobile, music, `youtu.be`, Shorts, live, or embed URL into the composer. 3. Confirm the preview resolves with the video's title, creator, and sanitized thumbnail without downloading the full watch-page HTML. 4. Try an embed URL with a percent-encoded ID, such as `https://www.youtube.com/embed/%64Qw4w9WgXcQ`, and confirm it resolves to the same video. 5. Try a YouTube lookalike domain or an embed ID containing encoded separators and confirm it is not routed through the provider path. --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com>