"""Local fork of render_excalidraw.py that sets ignore_https_errors=True on the browser context — needed in this sandbox where the system trust store rejects esm.sh's cert chain. Usage: python render.py [output.png] """ import json import sys from pathlib import Path from playwright.sync_api import sync_playwright def compute_bbox(elements): min_x = min_y = float("inf") max_x = max_y = float("-inf") for el in elements: if el.get("isDeleted"): continue x = el.get("x", 0) y = el.get("y", 0) w = el.get("width", 0) h = el.get("height", 0) if el.get("type") in ("arrow", "line") and "points" in el: for px, py in el["points"]: min_x = min(min_x, x + px) min_y = min(min_y, y + py) max_x = max(max_x, x + px) max_y = max(max_y, y + py) else: min_x = min(min_x, x) min_y = min(min_y, y) max_x = max(max_x, x + abs(w)) max_y = max(max_y, y + abs(h)) if min_x == float("inf"): return 0, 0, 800, 600 return min_x, min_y, max_x, max_y def render(in_path: Path, out_path: Path, scale: int = 2, max_w: int = 2400): data = json.loads(in_path.read_text(encoding="utf-8")) elements = [e for e in data["elements"] if not e.get("isDeleted")] minx, miny, maxx, maxy = compute_bbox(elements) pad = 80 vp_w = min(int(maxx - minx + pad * 2), max_w) vp_h = max(int(maxy - miny + pad * 2), 600) # Build template inline so we can pin the Excalidraw version (upstream # bundle for the latest tag has a broken transitive reference to # @braintree/sanitize-url@6.0.2 which 404s on esm.sh). local_template = Path(__file__).parent / "render_template.html" local_template.write_text( """

""", encoding="utf-8", ) template_url = local_template.as_uri() with sync_playwright() as p: browser = p.chromium.launch( headless=True, args=["--ignore-certificate-errors"], ) context = browser.new_context( viewport={"width": vp_w, "height": vp_h}, device_scale_factor=scale, ignore_https_errors=True, ) page = context.new_page() errors = [] page.on("pageerror", lambda e: errors.append(("pageerror", str(e)))) page.on( "requestfailed", lambda r: errors.append(("requestfailed", r.url, str(r.failure))), ) page.goto(template_url) try: page.wait_for_function("window.__moduleReady === true", timeout=45000) except Exception as e: print("Module did not become ready:", e, file=sys.stderr) for ev in errors: print(" ", ev, file=sys.stderr) browser.close() sys.exit(1) result = page.evaluate( "window.renderDiagram(%s)" % json.dumps(json.dumps(data)) ) if not result or not result.get("success"): print( "renderDiagram failed:", (result or {}).get("error", "no result"), file=sys.stderr, ) browser.close() sys.exit(1) page.wait_for_function("window.__renderComplete === true", timeout=20000) svg = page.query_selector("#root svg") if svg is None: print("No SVG found", file=sys.stderr) browser.close() sys.exit(1) svg.screenshot(path=str(out_path)) browser.close() if __name__ == "__main__": in_p = Path(sys.argv[1]) out_p = Path(sys.argv[2]) if len(sys.argv) > 2 else in_p.with_suffix(".png") render(in_p, out_p) print(f"Wrote {out_p}")