67 lines
3.5 KiB
Python
67 lines
3.5 KiB
Python
"""使用真实浏览器引擎打印应用生成的自包含主题快照。
|
|
|
|
子进程隔离 Playwright 在 Windows 上的事件循环与 Uvicorn，并把浏览器生命周期限制在
|
|
单次导出内。快照禁止脚本、网络和文件加载，字体与图片必须由客户端提前内嵌。
|
|
"""
|
|
from pathlib import Path
|
|
import os
|
|
import shutil
|
|
import subprocess
|
|
import sys
|
|
import tempfile
|
|
from app.export.document import ExportResult
|
|
|
|
|
|
def browser_executable():
|
|
"""优先使用显式配置，再查找系统已安装的 Chromium 系浏览器。"""
|
|
configured = os.environ.get('APP_PDF_BROWSER')
|
|
if configured:
|
|
return configured
|
|
for root in (os.environ.get('PROGRAMFILES(X86)', ''), os.environ.get('PROGRAMFILES', ''), os.environ.get('LOCALAPPDATA', '')):
|
|
if not root:
|
|
continue
|
|
for suffix in ('Microsoft/Edge/Application/msedge.exe', 'Google/Chrome/Application/chrome.exe'):
|
|
candidate = Path(root) / suffix
|
|
if candidate.is_file():
|
|
return str(candidate)
|
|
return next((p for name in ('chromium','chromium-browser','google-chrome','microsoft-edge') if (p := shutil.which(name))), None)
|
|
|
|
|
|
def render_snapshot(snapshot: str, page_size: str) -> ExportResult:
|
|
"""在隔离子进程中打印快照，避免阻塞或污染服务进程的事件循环。"""
|
|
with tempfile.TemporaryDirectory(prefix='notes-pdf-') as directory:
|
|
source = Path(directory) / 'snapshot.html'
|
|
output = Path(directory) / 'document.pdf'
|
|
source.write_text(snapshot, encoding='utf-8')
|
|
process = subprocess.run([sys.executable, '-m', 'app.export.browser_pdf', str(source), str(output), page_size],
|
|
capture_output=True, text=True, encoding='utf-8', errors='replace',
|
|
creationflags=getattr(subprocess, 'CREATE_NO_WINDOW', 0),
|
|
cwd=Path(__file__).resolve().parents[2])
|
|
if process.returncode:
|
|
raise RuntimeError('PDF browser rendering failed: ' + process.stderr[-2000:])
|
|
return ExportResult(content=output.read_bytes(), mime_type='application/pdf', warnings=[])
|
|
|
|
|
|
def print_snapshot(source: Path, output: Path, page_size: str):
|
|
"""在离线、禁用 JavaScript 的上下文中将自包含 HTML 打印为 PDF。"""
|
|
from playwright.sync_api import sync_playwright
|
|
with sync_playwright() as runtime:
|
|
browser = runtime.chromium.launch(executable_path=browser_executable(), headless=True)
|
|
try:
|
|
context = browser.new_context(java_script_enabled=False, offline=True)
|
|
context.route('**/*', lambda route: route.abort())
|
|
page = context.new_page()
|
|
page.set_default_timeout(0)
|
|
page.emulate_media(media='screen')
|
|
csp = "default-src 'none'; script-src 'none'; style-src 'unsafe-inline'; img-src data:; font-src data:; connect-src 'none'; frame-src 'none'; object-src 'none'; base-uri 'none'; form-action 'none'"
|
|
page.set_content('<meta http-equiv="Content-Security-Policy" content="'+csp+'">'+source.read_text(encoding='utf-8'), wait_until='load', timeout=0)
|
|
page.evaluate('async () => { await document.fonts.ready; await Promise.all([...document.images].map(image => image.decode().catch(() => {}))); }')
|
|
page.pdf(path=str(output), format='Letter' if page_size.lower()=='letter' else 'A4',
|
|
print_background=True, display_header_footer=False, prefer_css_page_size=False)
|
|
finally:
|
|
browser.close()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
print_snapshot(Path(sys.argv[1]), Path(sys.argv[2]), sys.argv[3])
|