diff --git a/web/static/js/sanitize-markdown.js b/web/static/js/sanitize-markdown.js index b3f21174..1e01d66d 100644 --- a/web/static/js/sanitize-markdown.js +++ b/web/static/js/sanitize-markdown.js @@ -68,9 +68,25 @@ domPurifyHooksInstalled = true; } + /** 明显 Markdown 结构时，不应因零散 HTML 标签误判为整页 HTML */ + function looksLikeMarkdown(src) { + const s = String(src); + return /^#{1,6}\s/m.test(s) + || /^\s*[-*+]\s/m.test(s) + || /^\s*\d+\.\s/m.test(s) + || /\*\*[^*\n]+\*\*/.test(s) + || /`[^`\n]+`/.test(s) + || /^```/m.test(s) + || /^\|.+\|/m.test(s) + || /^\s*>\s/m.test(s); + } + /** 探测工具返回的整页 HTML，不宜当作富文本渲染 */ function isHeavyRawHtml(src) { const s = String(src); + if (looksLikeMarkdown(s)) { + return false; + } if (/= 8; } + function escapePlainTextAsHtml(text) { + return escapeHtmlLocal(text).replace(/\n/g, '
'); + } + function formatHtmlAsEscapedPre(text) { return '
' + escapeHtmlLocal(text) + '
'; } @@ -115,6 +135,23 @@ * @param {{ profile?: 'chat'|'timeline' }} [options] * @returns {string} 安全 HTML */ + function buildRichHtmlFromSource(src) { + const hasHtmlTags = /<[a-z][\s\S]*>/i.test(src); + const preferMarkdown = typeof marked !== 'undefined' + && (looksLikeMarkdown(src) || !hasHtmlTags); + + if (preferMarkdown) { + const parsed = parseMarkdownSrc(src); + if (parsed != null) { + return parsed; + } + } + if (hasHtmlTags) { + return src; + } + return escapePlainTextAsHtml(src); + } + function formatMarkdownToHtml(text, options) { const profile = (options && options.profile === 'timeline') ? 'timeline' : 'chat'; const src = normalizeSource(text); @@ -124,24 +161,13 @@ } if (typeof DOMPurify === 'undefined') { - return escapeHtmlLocal(src).replace(/\n/g, '
'); + console.warn('DOMPurify 未加载，Markdown 已降级为纯文本渲染（已转义，防 XSS）'); + return escapePlainTextAsHtml(src); } installDomPurifyHooks(); const config = sanitizeConfigForProfile(profile); - - let html; - const hasHtmlTags = /<[a-z][\s\S]*>/i.test(src); - if (typeof marked !== 'undefined' && !hasHtmlTags) { - const parsed = parseMarkdownSrc(src); - html = parsed != null ? parsed : escapeHtmlLocal(src).replace(/\n/g, '
'); - } else if (hasHtmlTags) { - html = src; - } else { - html = escapeHtmlLocal(src).replace(/\n/g, '
'); - } - - return DOMPurify.sanitize(html, config); + return DOMPurify.sanitize(buildRichHtmlFromSource(src), config); } function sanitizeRichHtml(html, profile) { @@ -171,6 +197,7 @@ formatMarkdownToHtml: formatMarkdownToHtml, sanitizeRichHtml: sanitizeRichHtml, isHeavyRawHtml: isHeavyRawHtml, + looksLikeMarkdown: looksLikeMarkdown, escapeHtmlLocal: escapeHtmlLocal, stripSuspiciousImages: stripSuspiciousImages, }; diff --git a/web/static/vendor/marked.min.js b/web/static/vendor/marked.min.js new file mode 100644 index 00000000..789fc6bb --- /dev/null +++ b/web/static/vendor/marked.min.js @@ -0,0 +1,6 @@ +/** + * marked v11.1.1 - a markdown parser + * Copyright (c) 2011-2023, Christopher Jeffrey. (MIT Licensed) + * https://github.com/markedjs/marked + */ +!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).marked={})}(this,(function(e){"use strict";function t(){return{async:!1,breaks:!1,extensions:null,gfm:!0,hooks:null,pedantic:!1,renderer:null,silent:!1,tokenizer:null,walkTokens:null}}function n(t){e.defaults=t}e.defaults={async:!1,breaks:!1,extensions:null,gfm:!0,hooks:null,pedantic:!1,renderer:null,silent:!1,tokenizer:null,walkTokens:null};const s=/[&<>"']/,r=new RegExp(s.source,"g"),i=/[<>"']|&(?!(#\d{1,7}|#[Xx][a-fA-F0-9]{1,6}|\w+);)/,l=new RegExp(i.source,"g"),o={"&":"&","<":"<",">":">",'"':""","'":"'"},a=e=>o[e];function c(e,t){if(t){if(s.test(e))return e.replace(r,a)}else if(i.test(e))return e.replace(l,a);return e}const h=/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/gi;function p(e){return 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