app.py 文件源码

def render_pdf_from_html():
    template = (
        bottle.request.forms.data or bottle.request.forms.template or ''
    )
    backend = bottle.request.forms.backend or 'pdfkit'
    code = bottle.request.forms.qr or None
    options = bottle.request.forms.decode()

    try:
        qr_x = int(bottle.request.forms.qr_x or 545)
        qr_y = int(bottle.request.forms.qr_y or 20)
        version = None
        if bottle.request.forms.version:
            version = int(bottle.request.forms.version)
    except ValueError:
        return bottle.HTTPResponse(
            status=400,
            body='Invalid value passed to QR code coordinates.',
        )

    try:
        pdf_file = backends_registry.get(backend).render(template, options)
    except AttributeError:
        return bottle.HTTPResponse(
            status=400,
            body='Provided backend (%s) is not supported.' % backend,
        )

    if code is not None:
        try:
            pdf_file = postprocess_pdf(pdf_file, code, qr_x, qr_y, version)
        except ValueError:
            logger.error('Failed to append QR code', exc_info=True)
            return bottle.HTTPResponse(
                status=422,
                body='Unable to append QR code to rendered template.',
            )

    bottle.response.headers['Content-Type'] = 'application/pdf; charset=UTF-8'

    return pdf_file