chore: import upstream snapshot with attribution

2026-07-13 12:58:18 +08:00
commit 6d5d58c1a9
18293 changed files with 3502153 additions and 0 deletions
@@ -0,0 +1,53 @@
+/**
+ * Render a Chart.js config to a PNG, locally, in headless Chromium.
+ * The agent produces the Chart.js config (type + data + options); we draw it
+ * to a canvas and screenshot it. Chart.js is loaded from a CDN into our own
+ * browser — the chart *data* never leaves the host.
+ */
+import { getBrowser } from "./browser.js";
+
+const CHART_JS_CDN =
+  process.env["CHART_JS_URL"] ??
+  "https://cdn.jsdelivr.net/npm/chart.js@4.4.3/dist/chart.umd.js";
+
+export async function renderChart(
+  spec: Record<string, unknown>,
+  opts: { width?: number; height?: number } = {},
+): Promise<Buffer> {
+  const width = opts.width ?? 720;
+  const height = opts.height ?? 440;
+  const browser = await getBrowser();
+  const page = await browser.newPage({
+    viewport: { width, height },
+    deviceScaleFactor: 2,
+  });
+  try {
+    await page.setContent(
+      `<!doctype html><html><body style="margin:0;background:#ffffff">` +
+        `<canvas id="c" width="${width}" height="${height}"></canvas></body></html>`,
+    );
+    await page.addScriptTag({ url: CHART_JS_CDN });
+    const err = await page.evaluate((spec) => {
+      const el = document.getElementById("c") as HTMLCanvasElement | null;
+      if (!el) return "no canvas";
+      const s = spec as { options?: Record<string, unknown> };
+      s.options = { ...(s.options ?? {}), animation: false, responsive: false };
+      try {
+        // @ts-expect-error Chart is injected by the CDN script
+        new Chart(el.getContext("2d"), s);
+        return null;
+      } catch (e) {
+        return String((e as Error)?.message ?? e);
+      }
+    }, spec);
+    if (err) throw new Error(`Chart.js render failed: ${err}`);
+    // Chart.js with animation disabled paints synchronously; a tiny settle
+    // guards against font/layout reflow.
+    await page.waitForTimeout(120);
+    const canvas = await page.$("#c");
+    if (!canvas) throw new Error("canvas disappeared");
+    return (await canvas.screenshot({ type: "png" })) as Buffer;
+  } finally {
+    await page.close();
+  }
+}