74 lines
2.5 KiB
Ruby
74 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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#
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# Copyright (C) 2013 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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require "browser/browser"
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BrowserSupport = Struct.new(:browser, :version) do
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class << self
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def supported?(user_agent)
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browser = Browser.new(user_agent)
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return true if respondus? browser
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return true if chrome_os_lts? browser
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return false if minimum_browsers.any? { |min| browser.send("#{min.browser}?", "<#{min.version}") }
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true # if we don't recognize it (e.g. Android), be nice
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end
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def configuration
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@configuration ||= YAML.load_file(File.expand_path("../config/browsers.yml", __dir__))
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end
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def minimum_browsers
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@minimum_browsers ||= (configuration["minimums"] || [])
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.map { |browser, version| new(browser, version.to_s) }
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end
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private
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def lts
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@lts = OpenStruct.new(configuration["chrome_os_lts"])
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end
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#
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# Respondus lockdown browser includes a telltale in the User-Agent string which
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# is platform-dependent. Hopefully this never needs to be modified.
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#
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def respondus?(browser)
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return true if browser.platform.mac? && browser.ua.match(/ CMAC \d[.\d]+;/)
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return true if browser.platform.windows? && browser.ua.match(/ CLDB \d[.\d]+;/)
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false
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end
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#
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# Chrome OS has a long-term support (LTS) channel which is updated every 6 months.
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# Unfortunately, the LTS distinction is not reflected in the User-Agent string.
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# This method checks if the browser is Chrome running on Chrome OS and compares it
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# to the specific major LTS version specified in the configuration file.
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#
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def chrome_os_lts?(browser)
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return false unless browser.platform.chrome_os?
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return false unless browser.chrome?(lts.chrome)
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return true if /X11; CrOS \w+ #{lts.platform}/.match?(browser.ua)
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false
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end
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end
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end
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