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| 1 | +/** |
| 2 | + * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | + * |
| 4 | + * This source code is licensed under the MIT license found in the |
| 5 | + * LICENSE file in the root directory of this source tree. |
| 6 | + */ |
| 7 | + |
| 8 | +// Generates a static OG image for every content page, so social |
| 9 | +// cards show the page title without any runtime image generation. |
| 10 | +// Run after `next build` (see the `build` script in package.json). |
| 11 | + |
| 12 | +import fs from 'fs'; |
| 13 | +import path from 'path'; |
| 14 | +import satori from 'satori'; |
| 15 | +import {Resvg} from '@resvg/resvg-js'; |
| 16 | +import matter from 'gray-matter'; |
| 17 | + |
| 18 | +const ROOT = process.cwd(); |
| 19 | +const CONTENT_DIR = path.join(ROOT, 'src', 'content'); |
| 20 | +const OUT_DIR = path.join(ROOT, 'public', 'images', 'og'); |
| 21 | +const CONCURRENCY = 8; |
| 22 | + |
| 23 | +const bold = fs.readFileSync( |
| 24 | + path.join(ROOT, 'public', 'fonts', 'Optimistic_Display_W_Bd.ttf') |
| 25 | +); |
| 26 | +const medium = fs.readFileSync( |
| 27 | + path.join(ROOT, 'public', 'fonts', 'Optimistic_Display_W_Md.ttf') |
| 28 | +); |
| 29 | + |
| 30 | +function el(type, style, children) { |
| 31 | + return {type, props: {style, children}}; |
| 32 | +} |
| 33 | + |
| 34 | +function card(title, pagePath) { |
| 35 | + const footer = ('react.dev' + pagePath).toUpperCase(); |
| 36 | + const logo = { |
| 37 | + type: 'svg', |
| 38 | + props: { |
| 39 | + width: 80, |
| 40 | + height: 72, |
| 41 | + viewBox: '-10.5 -9.45 21 18.9', |
| 42 | + fill: 'none', |
| 43 | + children: [ |
| 44 | + {type: 'circle', props: {cx: 0, cy: 0, r: 2, fill: '#58c4dc'}}, |
| 45 | + { |
| 46 | + type: 'g', |
| 47 | + props: { |
| 48 | + stroke: '#58c4dc', |
| 49 | + strokeWidth: 1, |
| 50 | + fill: 'none', |
| 51 | + children: [ |
| 52 | + {type: 'ellipse', props: {rx: 10, ry: 4.5}}, |
| 53 | + { |
| 54 | + type: 'ellipse', |
| 55 | + props: {rx: 10, ry: 4.5, transform: 'rotate(60)'}, |
| 56 | + }, |
| 57 | + { |
| 58 | + type: 'ellipse', |
| 59 | + props: {rx: 10, ry: 4.5, transform: 'rotate(120)'}, |
| 60 | + }, |
| 61 | + ], |
| 62 | + }, |
| 63 | + }, |
| 64 | + ], |
| 65 | + }, |
| 66 | + }; |
| 67 | + return el( |
| 68 | + 'div', |
| 69 | + { |
| 70 | + width: '100%', |
| 71 | + height: '100%', |
| 72 | + display: 'flex', |
| 73 | + flexDirection: 'column', |
| 74 | + padding: '72px 80px', |
| 75 | + backgroundColor: '#23272f', |
| 76 | + backgroundImage: |
| 77 | + 'radial-gradient(circle at 25% 30%, #343a46 0%, #23272f 55%)', |
| 78 | + }, |
| 79 | + [ |
| 80 | + el('div', {display: 'flex', alignItems: 'center', gap: '20px'}, [ |
| 81 | + logo, |
| 82 | + el( |
| 83 | + 'div', |
| 84 | + { |
| 85 | + fontSize: 48, |
| 86 | + fontFamily: 'Optimistic Display Bold', |
| 87 | + color: '#f6f7f9', |
| 88 | + }, |
| 89 | + 'React' |
| 90 | + ), |
| 91 | + ]), |
| 92 | + el( |
| 93 | + 'div', |
| 94 | + { |
| 95 | + marginTop: 'auto', |
| 96 | + marginBottom: 'auto', |
| 97 | + fontSize: title.length > 24 ? 72 : 96, |
| 98 | + fontFamily: 'Optimistic Display Bold', |
| 99 | + color: '#f6f7f9', |
| 100 | + lineHeight: 1.1, |
| 101 | + wordBreak: 'break-word', |
| 102 | + }, |
| 103 | + title |
| 104 | + ), |
| 105 | + el( |
| 106 | + 'div', |
| 107 | + { |
| 108 | + fontSize: 28, |
| 109 | + fontFamily: 'Optimistic Display Medium', |
| 110 | + color: '#99a1b3', |
| 111 | + letterSpacing: '0.08em', |
| 112 | + }, |
| 113 | + footer |
| 114 | + ), |
| 115 | + ] |
| 116 | + ); |
| 117 | +} |
| 118 | + |
| 119 | +async function renderCard(title, pagePath) { |
| 120 | + const svg = await satori(card(title, pagePath), { |
| 121 | + width: 1200, |
| 122 | + height: 630, |
| 123 | + fonts: [ |
| 124 | + { |
| 125 | + name: 'Optimistic Display Bold', |
| 126 | + data: bold, |
| 127 | + weight: 700, |
| 128 | + style: 'normal', |
| 129 | + }, |
| 130 | + { |
| 131 | + name: 'Optimistic Display Medium', |
| 132 | + data: medium, |
| 133 | + weight: 500, |
| 134 | + style: 'normal', |
| 135 | + }, |
| 136 | + ], |
| 137 | + }); |
| 138 | + return new Resvg(svg, {fitTo: {mode: 'width', value: 1200}}).render().asPng(); |
| 139 | +} |
| 140 | + |
| 141 | +function collectSidebarTitles() { |
| 142 | + const titles = new Map(); |
| 143 | + for (const name of fs.readdirSync(path.join(ROOT, 'src'))) { |
| 144 | + if (!/^sidebar.*\.json$/.test(name)) continue; |
| 145 | + const walk = (node) => { |
| 146 | + if (node.path && node.title) { |
| 147 | + titles.set(node.path, node.title); |
| 148 | + } |
| 149 | + for (const child of node.routes ?? []) walk(child); |
| 150 | + }; |
| 151 | + walk(JSON.parse(fs.readFileSync(path.join(ROOT, 'src', name), 'utf8'))); |
| 152 | + } |
| 153 | + return titles; |
| 154 | +} |
| 155 | + |
| 156 | +const sidebarTitles = collectSidebarTitles(); |
| 157 | + |
| 158 | +function collectPages(dir, out) { |
| 159 | + for (const entry of fs.readdirSync(dir, {withFileTypes: true})) { |
| 160 | + const full = path.join(dir, entry.name); |
| 161 | + if (entry.isDirectory()) { |
| 162 | + collectPages(full, out); |
| 163 | + } else if (entry.name.endsWith('.md')) { |
| 164 | + const rel = path.relative(CONTENT_DIR, full).replace(/\.md$/, ''); |
| 165 | + const segments = rel.split(path.sep); |
| 166 | + if (segments[segments.length - 1] === 'index') { |
| 167 | + segments.pop(); |
| 168 | + } |
| 169 | + const pagePath = '/' + segments.join('/'); |
| 170 | + const {data} = matter(fs.readFileSync(full, 'utf8')); |
| 171 | + const title = data.title ?? sidebarTitles.get(pagePath); |
| 172 | + if (title) { |
| 173 | + out.push({title: String(title), pagePath}); |
| 174 | + } |
| 175 | + } |
| 176 | + } |
| 177 | + return out; |
| 178 | +} |
| 179 | + |
| 180 | +export function ogImageFileName(pagePath) { |
| 181 | + return pagePath.replace(/^\//, '').replace(/\//g, '-') + '.png'; |
| 182 | +} |
| 183 | + |
| 184 | +async function main() { |
| 185 | + const pages = collectPages(CONTENT_DIR, []); |
| 186 | + fs.mkdirSync(OUT_DIR, {recursive: true}); |
| 187 | + let done = 0; |
| 188 | + const queue = [...pages]; |
| 189 | + async function worker() { |
| 190 | + for (;;) { |
| 191 | + const page = queue.shift(); |
| 192 | + if (!page) return; |
| 193 | + const png = await renderCard(page.title, page.pagePath); |
| 194 | + fs.writeFileSync(path.join(OUT_DIR, ogImageFileName(page.pagePath)), png); |
| 195 | + done++; |
| 196 | + if (done % 100 === 0) { |
| 197 | + console.log(`og-images: ${done}/${pages.length}`); |
| 198 | + } |
| 199 | + } |
| 200 | + } |
| 201 | + await Promise.all(Array.from({length: CONCURRENCY}, worker)); |
| 202 | + console.log(`og-images: generated ${done} images in public/images/og`); |
| 203 | +} |
| 204 | + |
| 205 | +main().catch((error) => { |
| 206 | + console.error(error); |
| 207 | + process.exit(1); |
| 208 | +}); |
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