ファイル名にアンダースコアが含まれる場合の添付ファイルマークアップ生成の不具合

zogstrip · 2026 年 4 月 7 日午後 2:33

@ValdikSS ご報告ありがとうございますこれでこの問題を完全に解決できるかもしれません。

github.com/discourse/discourse

FIX: Escape markdown characters in upload filenames (#39133)

main ← fix/escape-markdown-in-upload-filenames

opened 02:33PM - 07 Apr 26 UTC

ZogStriP

+159 -58

Filenames containing markdown formatting characters (`_`, `*`, `~`, `` ` ``, `[`…, `]`, `|`) would break upload markup when cooked. For example, uploading `_test_file_.txt` generated: [_test_file_.txt|attachment](upload://...) The underscores triggered emphasis parsing inside the link text, which both rendered the filename incorrectly (with italics) and prevented the `|attachment` marker from being recognized — losing the `class="attachment"` on the resulting `<a>` tag. **Markdown generation (defense in depth)** Add `escapeMarkdownCharacters` (JS) and `UploadMarkdown.escape_markdown` (Ruby) to backslash-escape all inline formatting characters in filenames before embedding them in markdown link text. Applied in: - `UploadMarkdown` — image, attachment, and playable media methods - `uploads.js` — `attachmentMarkdown` and `markdownNameFromFileName` - `inline_uploads.rb` — HTML anchor conversion and hotlinked image URLs - `to-markdown.js` — HTML-to-markdown attachment link reconstruction - `sanitizeAlt` in `markdown-image-builder.js` — image alt text **Parser resilience (belt and suspenders)** The markdown-it `renderAttachment` renderer and ProseMirror's link parser both assumed `tokens[idx+1]` was a single text token containing the full link text. When emphasis/bold/strikethrough/code was parsed inside the link text, the token sequence included formatting tokens and the `|attachment` marker was lost. Both now scan forward through all tokens between `link_open` and `link_close` to find the marker. The image renderer (`renderImageOrPlayableMedia`) split alt text on `|` assuming the first segment was always the alt and everything after was structured suffixes (dimensions, video/audio, data attributes). A pipe in the filename would produce extra segments that confused the dimension parser. It now scans from the right, consuming known suffixes, and treats everything remaining as alt text. https://meta.discourse.org/t/400079

トピック		返信	表示
Some links are misinterpreted Bug	7	758	2022 年 8 月 8 日
Double-escaping of underscores in image alt text corrupts post raw on each edit Support	2	69	2026 年 4 月 23 日
Links broken with (at least) two underscores in URL Bug	9	2078	2022 年 6 月 15 日
Links with underbars surrounded by hyphens render incorrectly Bug	2	772	2018 年 9 月 24 日
A comma followed by an underscore in a URL results in defunct link Bug markdown-it-review	6	2863	2017 年 6 月 26 日

ファイル名にアンダースコアが含まれる場合の添付ファイルマークアップ生成の不具合

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