55 lines
1.9 KiB
Ruby

# typed: false
# frozen_string_literal: true
module Homebrew
module Livecheck
module Strategy
# The {Npm} strategy identifies versions of software at
# registry.npmjs.org by checking the listed versions for a package.
#
# npm URLs take one of the following formats:
#
# * `https://registry.npmjs.org/example/-/example-1.2.3.tgz`
# * `https://registry.npmjs.org/@example/example/-/example-1.2.3.tgz`
#
# The default regex matches URLs in the `href` attributes of version tags
# on the "Versions" tab of the package page.
#
# @api public
class Npm
NICE_NAME = "npm"
# The `Regexp` used to determine if the strategy applies to the URL.
URL_MATCH_REGEX = /registry\.npmjs\.org/i.freeze
# Whether the strategy can be applied to the provided URL.
#
# @param url [String] the URL to match against
# @return [Boolean]
def self.match?(url)
URL_MATCH_REGEX.match?(url)
end
# Generates a URL and regex (if one isn't provided) and passes them
# to {PageMatch.find_versions} to identify versions in the content.
#
# @param url [String] the URL of the content to check
# @param regex [Regexp] a regex used for matching versions in content
# @return [Hash]
def self.find_versions(url, regex = nil)
%r{registry\.npmjs\.org/(?<package_name>.+)/-/}i =~ url
page_url = "https://www.npmjs.com/package/#{package_name}?activeTab=versions"
# Example regexes:
# * `%r{href=.*?/package/example/v/(\d+(?:\.\d+)+)"}i`
# * `%r{href=.*?/package/@example/example/v/(\d+(?:\.\d+)+)"}i`
regex ||= %r{href=.*?/package/#{Regexp.escape(package_name)}/v/(\d+(?:\.\d+)+)"}i
Homebrew::Livecheck::Strategy::PageMatch.find_versions(page_url, regex)
end
end
end
end
end