api/utils/web_utils.py

import re
import json
import base64

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.expected_conditions import staleness_of
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.common.by import By


def html2pdf(
        source: str,
        timeout: int = 2,
        install_driver: bool = True,
        print_options: dict = {},
):
    result = __get_pdf_from_html(source, timeout, install_driver, print_options)
    return result


def __send_devtools(driver, cmd, params={}):
    resource = "/session/%s/chromium/send_command_and_get_result" % driver.session_id
    url = driver.command_executor._url + resource
    body = json.dumps({"cmd": cmd, "params": params})
    response = driver.command_executor._request("POST", url, body)

    if not response:
        raise Exception(response.get("value"))

    return response.get("value")


def __get_pdf_from_html(
        path: str,
        timeout: int,
        install_driver: bool,
        print_options: dict
):
    webdriver_options = Options()
    webdriver_prefs = {}
    webdriver_options.add_argument("--headless")
    webdriver_options.add_argument("--disable-gpu")
    webdriver_options.add_argument("--no-sandbox")
    webdriver_options.add_argument("--disable-dev-shm-usage")
    webdriver_options.experimental_options["prefs"] = webdriver_prefs

    webdriver_prefs["profile.default_content_settings"] = {"images": 2}

    if install_driver:
        service = Service(ChromeDriverManager().install())
        driver = webdriver.Chrome(service=service, options=webdriver_options)
    else:
        driver = webdriver.Chrome(options=webdriver_options)

    driver.get(path)

    try:
        WebDriverWait(driver, timeout).until(
            staleness_of(driver.find_element(by=By.TAG_NAME, value="html"))
        )
    except TimeoutException:
        calculated_print_options = {
            "landscape": False,
            "displayHeaderFooter": False,
            "printBackground": True,
            "preferCSSPageSize": True,
        }
        calculated_print_options.update(print_options)
        result = __send_devtools(
            driver, "Page.printToPDF", calculated_print_options)
        driver.quit()
        return base64.b64decode(result["data"])


def is_valid_url(url: str) -> bool:
    return bool(re.match(r"(https?|ftp|file)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]", url))