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Add hasMath flag, XSS fix, conditional KaTeX CSS

nandi 1678a5ea 5dfbeb75

+64 -16
+2 -2
package.json
··· 7 7 "dev": "bun run --watch src/server/index.ts", 8 8 "dev:firehose": "bun run --watch src/firehose/index.ts", 9 9 "build:fonts": "mkdir -p public/fonts && cp node_modules/katex/dist/fonts/* public/fonts/", 10 - "build:css": "bun run build:fonts && bunx @tailwindcss/cli -i public/style.css -o public/dist.css", 11 - "dev:css": "bun run build:fonts && bunx @tailwindcss/cli -i public/style.css -o public/dist.css --watch", 10 + "build:css": "mkdir -p public/fonts && cp node_modules/katex/dist/fonts/* public/fonts/ && cp node_modules/katex/dist/katex.min.css public/katex.css && bunx @tailwindcss/cli -i public/style.css -o public/dist.css", 11 + "dev:css": "mkdir -p public/fonts && cp node_modules/katex/dist/fonts/* public/fonts/ && cp node_modules/katex/dist/katex.min.css public/katex.css && bunx @tailwindcss/cli -i public/style.css -o public/dist.css --watch", 12 12 "test": "bun test", 13 13 "test:unit": "bun test tests/lib/ tests/atproto/ tests/firehose/ tests/server/", 14 14 "test:integration": "bun test tests/integration/",
+1
public/katex.css
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format("woff"),url(fonts/KaTeX_Fraktur-Bold.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(fonts/KaTeX_Fraktur-Regular.woff2) format("woff2"),url(fonts/KaTeX_Fraktur-Regular.woff) format("woff"),url(fonts/KaTeX_Fraktur-Regular.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(fonts/KaTeX_Main-Bold.woff2) format("woff2"),url(fonts/KaTeX_Main-Bold.woff) format("woff"),url(fonts/KaTeX_Main-Bold.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(fonts/KaTeX_Main-BoldItalic.woff2) format("woff2"),url(fonts/KaTeX_Main-BoldItalic.woff) format("woff"),url(fonts/KaTeX_Main-BoldItalic.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(fonts/KaTeX_Main-Italic.woff2) format("woff2"),url(fonts/KaTeX_Main-Italic.woff) 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-1
public/style.css
··· 1 1 @import "tailwindcss"; 2 - @import "katex/dist/katex.min.css"; 3 2 @plugin "@tailwindcss/typography"; 4 3 @source "../src"; 5 4
+2
src/lib/constants.ts
··· 23 23 24 24 export const EDITOR_SCRIPTS = ["/public/editor/dist.js"]; 25 25 26 + export const KATEX_STYLESHEETS = ["/public/katex.css"]; 27 + 26 28 export const MIME_TO_EXT: Record<string, string> = { 27 29 "image/jpeg": "jpg", 28 30 "image/png": "png",
+4 -3
src/lib/markdown.ts
··· 1 1 import MarkdownIt from "markdown-it"; 2 + import { type KatexPluginEnv, katexPlugin } from "./markdown/katex-plugin.ts"; 2 3 import { 3 4 type WikilinkEnv, 4 5 wikilinkPlugin, 5 6 } from "./markdown/wikilink-plugin.ts"; 6 - import { katexPlugin } from "./markdown/katex-plugin.ts"; 7 7 import { type VizPluginEnv, vizPlugin } from "./viz/plugin.ts"; 8 8 9 9 interface RenderResult { 10 10 html: string; 11 11 hasViz: boolean; 12 + hasMath: boolean; 12 13 } 13 14 14 - interface MarkdownEnv extends VizPluginEnv, WikilinkEnv {} 15 + interface MarkdownEnv extends VizPluginEnv, WikilinkEnv, KatexPluginEnv {} 15 16 16 17 const md = new MarkdownIt({ html: false, linkify: true }); 17 18 ··· 63 64 ): RenderResult { 64 65 const env: MarkdownEnv = wikiSlug ? { wikiSlug } : {}; 65 66 const html = md.render(source, env); 66 - return { html, hasViz: env.hasViz === true }; 67 + return { html, hasViz: env.hasViz === true, hasMath: env.hasMath === true }; 67 68 } 68 69 69 70 /**
+17 -6
src/lib/markdown/katex-plugin.ts
··· 1 1 import katex from "katex"; 2 2 import type MarkdownIt from "markdown-it"; 3 + import { escapeHtml } from "../html.ts"; 3 4 4 5 interface KatexPluginOptions { 5 6 throwOnError?: boolean; 6 7 errorColor?: string; 7 8 displayMode?: boolean; 9 + } 10 + 11 + export interface KatexPluginEnv { 12 + hasMath?: boolean; 8 13 } 9 14 10 15 function isValidDelim(state: MarkdownIt.StateInline, pos: number) { ··· 133 138 return true; 134 139 } 135 140 136 - function renderKatex(latex: string, options: KatexPluginOptions, displayMode: boolean) { 141 + function renderKatex( 142 + latex: string, 143 + options: KatexPluginOptions, 144 + displayMode: boolean, 145 + env?: unknown, 146 + ) { 137 147 try { 148 + if (env) (env as KatexPluginEnv).hasMath = true; 138 149 return katex.renderToString(latex, { 139 150 ...options, 140 151 displayMode, 141 152 }); 142 153 } catch (error) { 143 154 if (options.throwOnError) console.error(error); 144 - return latex; 155 + return escapeHtml(latex); 145 156 } 146 157 } 147 158 ··· 150 161 md.block.ruler.after("blockquote", "math_block", mathBlock, { 151 162 alt: ["paragraph", "reference", "blockquote", "list"], 152 163 }); 153 - md.renderer.rules.math_inline = (tokens, idx) => 154 - renderKatex(tokens[idx].content, options, false); 155 - md.renderer.rules.math_block = (tokens, idx) => 156 - `<p>${renderKatex(tokens[idx].content, options, true)}</p>\n`; 164 + md.renderer.rules.math_inline = (tokens, idx, _options, env) => 165 + renderKatex(tokens[idx].content, options, false, env); 166 + md.renderer.rules.math_block = (tokens, idx, _options, env) => 167 + `<p>${renderKatex(tokens[idx].content, options, true, env)}</p>\n`; 157 168 }
+7 -2
src/server/routes/note.ts
··· 1 1 import { Elysia } from "elysia"; 2 2 import { getAtprotoEnv } from "../../atproto/env.ts"; 3 3 import { resolveWikiContext } from "../../lib/access.ts"; 4 - import { EDITOR_SCRIPTS, VIZ_SCRIPTS } from "../../lib/constants.ts"; 4 + import { 5 + EDITOR_SCRIPTS, 6 + KATEX_STYLESHEETS, 7 + VIZ_SCRIPTS, 8 + } from "../../lib/constants.ts"; 5 9 import { NotFoundError, ValidationError } from "../../lib/errors.ts"; 6 10 import { t } from "../../lib/i18n/index.ts"; 7 11 import { exportNoteMd } from "../../lib/import-export/export.ts"; ··· 124 128 throw new NotFoundError("Note not found"); 125 129 } 126 130 127 - const { html, hasViz } = renderMarkdown( 131 + const { html, hasViz, hasMath } = renderMarkdown( 128 132 data.current.content, 129 133 params.wikiSlug, 130 134 ); ··· 146 150 html, 147 151 { 148 152 ...(hasViz && { scripts: VIZ_SCRIPTS }), 153 + ...(hasMath && { stylesheets: KATEX_STYLESHEETS }), 149 154 session: ctx.session, 150 155 sidebarNotes, 151 156 currentNoteSlug: params.noteSlug,
+3 -2
src/server/routes/wiki.ts
··· 6 6 resolveWikiContext, 7 7 resolveWikiContextSoft, 8 8 } from "../../lib/access.ts"; 9 - import { VIZ_SCRIPTS } from "../../lib/constants.ts"; 9 + import { KATEX_STYLESHEETS, VIZ_SCRIPTS } from "../../lib/constants.ts"; 10 10 import { 11 11 ForbiddenError, 12 12 ImportError, ··· 233 233 const bmHtml = resolveBookmarkHtml(ctx.did, ctx.wiki.at_uri, msg); 234 234 235 235 if (homeData) { 236 - const { html, hasViz } = renderMarkdown( 236 + const { html, hasViz, hasMath } = renderMarkdown( 237 237 homeData.current.content, 238 238 params.wikiSlug, 239 239 ); ··· 253 253 html, 254 254 { 255 255 ...(hasViz && { scripts: VIZ_SCRIPTS }), 256 + ...(hasMath && { stylesheets: KATEX_STYLESHEETS }), 256 257 session: ctx.session, 257 258 sidebarNotes, 258 259 currentNoteSlug: "home",
+6
src/views/layout.ts
··· 19 19 20 20 export interface LayoutOptions { 21 21 scripts?: string[]; 22 + stylesheets?: string[]; 22 23 session?: { did: string; handle: string } | null; 23 24 wikiName?: string; 24 25 wikiSlug?: string; ··· 125 126 .map((src) => ` <script src="${src}"></script>`) 126 127 .join("\n"); 127 128 129 + const extraStyles = (options?.stylesheets ?? []) 130 + .map((href) => ` <link rel="stylesheet" href="${href}">`) 131 + .join("\n"); 132 + 128 133 const locale = options?.locale ?? "en"; 129 134 const msg = t(locale); 130 135 ··· 185 190 : "" 186 191 } 187 192 <link rel="stylesheet" href="/public/dist.css"> 193 + ${extraStyles} 188 194 <script src="https://unpkg.com/htmx.org@2.0.4"></script> 189 195 ${extraScripts} 190 196 </head>
+22
tests/lib/markdown.test.ts
··· 25 25 expect(html).toContain("katex-mathml"); 26 26 expect(html).toContain(String.raw`\int_0^1 x^2 \; dx`); 27 27 }); 28 + 29 + test("escapes invalid KaTeX to prevent XSS", () => { 30 + const malicious = "$<img src=x onerror=alert(1)>"; 31 + const { html } = renderMarkdown(malicious); 32 + expect(html).not.toContain("<img"); 33 + expect(html).toContain("&lt;img"); 34 + }); 35 + 36 + test("hasMath is true for inline math", () => { 37 + const result = renderMarkdown("Energy is $E = mc^2$."); 38 + expect(result.hasMath).toBe(true); 39 + }); 40 + 41 + test("hasMath is true for block math", () => { 42 + const result = renderMarkdown("$$\\int_0^1 x^2 \\; dx$$"); 43 + expect(result.hasMath).toBe(true); 44 + }); 45 + 46 + test("hasMath is false when no math present", () => { 47 + const result = renderMarkdown("Just plain text."); 48 + expect(result.hasMath).toBe(false); 49 + }); 28 50 }); 29 51 30 52 describe("wikilinks", () => {