docs: serve uncached random readme badge

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
+.wrangler/
 coverage/
 .env
 .env.*

README.en.md

@@ -8,7 +8,7 @@
   <p>
     <a href="LICENSE"><img src="https://img.shields.io/github/license/xmanrui/dsh-im" alt="MIT license"></a>
     <img src="https://img.shields.io/badge/agent-DeepSeek%20Harness-5865f2" alt="DeepSeek Harness">
-    <img src="https://redirectwizard.com/redirect/MD1G1" alt="滑动变祖器：今天是梁子或今天是梁圣（随机）">
+    <img src="https://dsh-im-random-badge.xmanrui-dsh-im.workers.dev" alt="滑动变祖器：今天是梁子或今天是梁圣（随机）">
   </p>
 
   <p><a href="README.md">简体中文</a> · <strong>English</strong></p>

README.md

@@ -9,7 +9,7 @@
   <p>
     <a href="LICENSE"><img src="https://img.shields.io/github/license/xmanrui/dsh-im" alt="MIT 许可证"></a>
     <img src="https://img.shields.io/badge/agent-DeepSeek%20Harness-5865f2" alt="DeepSeek Harness">
-    <img src="https://redirectwizard.com/redirect/MD1G1" alt="滑动变祖器：今天是梁子或今天是梁圣（随机）">
+    <img src="https://dsh-im-random-badge.xmanrui-dsh-im.workers.dev" alt="滑动变祖器：今天是梁子或今天是梁圣（随机）">
   </p>
 
   <p><strong>简体中文</strong> · <a href="README.en.md">English</a></p>

test/random-badge-worker.test.mjs

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+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import worker, {
+  createBadgeResponse,
+  pickBadgeValue,
+  renderBadge,
+} from '../worker/random-badge.mjs';
+
+test('random badge selects both supported values at the sample boundary', () => {
+  assert.equal(pickBadgeValue(() => 0), '今天是梁子');
+  assert.equal(pickBadgeValue(() => 0.499999), '今天是梁子');
+  assert.equal(pickBadgeValue(() => 0.5), '今天是梁圣');
+  assert.equal(pickBadgeValue(() => 0.999999), '今天是梁圣');
+});
+
+test('random badge rejects invalid random samples and badge values', () => {
+  assert.throws(() => pickBadgeValue(() => -0.1), RangeError);
+  assert.throws(() => pickBadgeValue(() => 1), RangeError);
+  assert.throws(() => renderBadge('今天是别人'), RangeError);
+});
+
+test('random badge reproduces the Shields layout for either value', () => {
+  for (const value of ['今天是梁子', '今天是梁圣']) {
+    const svg = renderBadge(value);
+
+    assert.match(svg, /width="130" height="20"/);
+    assert.match(svg, /<rect width="65" height="20" fill="#555"\/>/);
+    assert.match(svg, /<rect x="65" width="65" height="20" fill="#f39c12"\/>/);
+    assert.match(svg, new RegExp(`<title>滑动变祖器: ${value}</title>`));
+  }
+});
+
+test('worker returns a fresh SVG and explicitly disables every cache layer', async () => {
+  const response = await worker.fetch(new Request('https://badge.example/'));
+  const svg = await response.text();
+
+  assert.equal(response.status, 200);
+  assert.equal(response.headers.get('content-type'), 'image/svg+xml; charset=utf-8');
+  assert.equal(response.headers.get('cache-control'), 'no-store, no-cache, must-revalidate, max-age=0');
+  assert.equal(response.headers.get('cdn-cache-control'), 'no-store');
+  assert.equal(response.headers.get('cloudflare-cdn-cache-control'), 'no-store');
+  assert.equal(response.headers.get('surrogate-control'), 'no-store');
+  assert.match(svg, /今天是梁(?:子|圣)/);
+});
+
+test('worker supports HEAD and rejects state-changing methods', async () => {
+  const headResponse = createBadgeResponse('HEAD');
+  const postResponse = createBadgeResponse('POST');
+
+  assert.equal(headResponse.status, 200);
+  assert.equal(await headResponse.text(), '');
+  assert.equal(postResponse.status, 405);
+  assert.equal(postResponse.headers.get('allow'), 'GET, HEAD');
+});

worker/random-badge.mjs

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+const BADGE_LABEL = '滑动变祖器';
+const BADGE_VALUES = Object.freeze(['今天是梁子', '今天是梁圣']);
+
+function secureRandom() {
+  const sample = new Uint32Array(1);
+  crypto.getRandomValues(sample);
+  return sample[0] / 0x1_0000_0000;
+}
+
+export function pickBadgeValue(random = secureRandom) {
+  const sample = random();
+
+  if (!Number.isFinite(sample) || sample < 0 || sample >= 1) {
+    throw new RangeError('Random samples must be finite numbers from 0 (inclusive) to 1 (exclusive).');
+  }
+
+  return BADGE_VALUES[Math.floor(sample * BADGE_VALUES.length)];
+}
+
+export function renderBadge(value) {
+  if (!BADGE_VALUES.includes(value)) {
+    throw new RangeError(`Unsupported badge value: ${value}`);
+  }
+
+  const accessibleLabel = `${BADGE_LABEL}: ${value}`;
+
+  return `<svg xmlns="http://www.w3.org/2000/svg" width="130" height="20" role="img" aria-label="${accessibleLabel}"><title>${accessibleLabel}</title><filter id="blur"><feGaussianBlur stdDeviation="16"/></filter><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="130" height="20" rx="3"/></clipPath><g clip-path="url(#r)"><rect width="65" height="20" fill="#555"/><rect x="65" width="65" height="20" fill="#f39c12"/><rect width="130" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><g transform="scale(.1)"><g aria-hidden="true" fill="#010101"><text x="335" y="150" fill-opacity=".8" filter="url(#blur)" textLength="550">${BADGE_LABEL}</text><text x="335" y="150" fill-opacity=".3" textLength="550">${BADGE_LABEL}</text></g><text x="335" y="140" textLength="550">${BADGE_LABEL}</text></g><g transform="scale(.1)"><g aria-hidden="true" fill="#010101"><text x="965" y="150" fill-opacity=".8" filter="url(#blur)" textLength="550">${value}</text><text x="965" y="150" fill-opacity=".3" textLength="550">${value}</text></g><text x="965" y="140" textLength="550">${value}</text></g></g></svg>`;
+}
+
+const NO_CACHE_HEADERS = {
+  'Cache-Control': 'no-store, no-cache, must-revalidate, max-age=0',
+  'CDN-Cache-Control': 'no-store',
+  'Cloudflare-CDN-Cache-Control': 'no-store',
+  'Content-Type': 'image/svg+xml; charset=utf-8',
+  Expires: '0',
+  Pragma: 'no-cache',
+  'Surrogate-Control': 'no-store',
+  'X-Content-Type-Options': 'nosniff',
+};
+
+export function createBadgeResponse(method = 'GET') {
+  if (method !== 'GET' && method !== 'HEAD') {
+    return new Response('Method Not Allowed', {
+      status: 405,
+      headers: {
+        ...NO_CACHE_HEADERS,
+        Allow: 'GET, HEAD',
+        'Content-Type': 'text/plain; charset=utf-8',
+      },
+    });
+  }
+
+  const body = method === 'HEAD' ? null : renderBadge(pickBadgeValue());
+  return new Response(body, { headers: NO_CACHE_HEADERS });
+}
+
+export default {
+  fetch(request) {
+    return createBadgeResponse(request.method);
+  },
+};

wrangler.jsonc

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+{
+  "$schema": "https://raw.githubusercontent.com/cloudflare/workers-sdk/main/packages/wrangler/config-schema.json",
+  "name": "dsh-im-random-badge",
+  "main": "worker/random-badge.mjs",
+  "compatibility_date": "2026-08-18",
+  "workers_dev": true,
+  "preview_urls": false
+}