Chrome无头下载pdf

Question

我有一个脚本，可以从一个每月更新的网站下载pdf，我想自动化它。它可以工作，但我不能让它无头工作，我认为这是因为它没有正确处理下载。它似乎在headless ok中启动了chrome，我的导航命令似乎可以工作，但当它下载时，什么也没发生。

#!/usr/bin/env ruby
#
require 'capybara'
require 'rb-inotify'
require 'webdrivers/chromedriver'
def initialise
Capybara.register_driver :chrome do |app|
Capybara::Selenium::Driver.new(app, :browser => :chrome, options: chrome_options)
end
@session = Capybara::Session.new(:chrome)
end
# Settings and profile for the Chrome Browser
# NOTE: still cannot get headless working
def chrome_options
opts = Selenium::WebDriver::Chrome::Options.new
opts.add_argument('--headless') unless ENV['UI']
opts.add_argument('--no-sandbox')
opts.add_argument('--disable-gpu')
opts.add_argument('--disable-dev-shm-usage')
opts.add_argument('--window-size=1920,1080')
opts.add_preference(:download,
directory_upgrade: true,
prompt_for_download: false,
default_directory: "~/Downloads")
opts.add_preference(:plugins,
plugins_disabled: ["Chrome PDF Viewer"])
opts.add_preference(:browser, set_download_behavior: { behavior: 'allow' })
opts
end

更新我使用的是Chrome版本81.0.4044.113-1

Answer 1

在不同版本的Chrome和selenium网络驱动程序中，下载所需的设置发生了变化/增长。看起来你错过了其中一个。

opts.add_preference('download.default_directory', '~/Downloads')

另一件你也可以做的事情，取决于版本，是

def initialise
Capybara.register_driver :chrome do |app|
Capybara::Selenium::Driver.new(app, :browser => :chrome, options: chrome_options).tap do |driver|
driver.browser.download_path = '~/Downloads'
end
@session = Capybara::Session.new(:chrome)
end

Answer 2

我为您的代码添加了一些配置，可能会起作用：

#!/usr/bin/env ruby
#
require 'capybara'
require 'rb-inotify'
require 'webdrivers/chromedriver'
def initialise
Capybara.register_driver :chrome do |app|
Capybara::Selenium::Driver.new(app, :browser => :chrome, options: chrome_options)
end
@session = Capybara::Session.new(:chrome)
end
# Settings and profile for the Chrome Browser
# NOTE: still cannot get headless working
def chrome_options
download_directory = "~/Downloads"
opts = Selenium::WebDriver::Chrome::Options.new
opts.add_argument('--headless') unless ENV['UI']
opts.add_argument('--no-sandbox')
opts.add_argument('--disable-gpu')
opts.add_argument('--disable-dev-shm-usage')
opts.add_argument('--window-size=1920,1080')
opts.add_preference(:download,
directory_upgrade: true,
prompt_for_download: false,
default_directory: download_directory)
opts.add_preference(:browser, set_download_behavior: { behavior: 'allow' })
driver = Capybara::Selenium::Driver.new(app, browser: :chrome,
options: options)
bridge = driver.browser.send(:bridge)
path = '/session/:session_id/chromium/send_command'
path[':session_id'] = bridge.session_id
bridge.http.call(:post, path, cmd: 'Page.setDownloadBehavior',
params: {
behavior: 'allow',
downloadPath: download_directory
})
driver
opts.add_preference(:plugins,
always_open_pdf_externally: true)
opts.add_preference(:browser, set_download_behavior: { behavior: 'allow' })
opts
end