68 lines
2.4 KiB
Ruby
68 lines
2.4 KiB
Ruby
# typed: false
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# frozen_string_literal: true
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require "uri"
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module Homebrew
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module Livecheck
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module Strategy
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# The {Cpan} strategy identifies versions of software at
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# cpan.metacpan.org by checking directory listing pages.
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#
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# CPAN URLs take the following format:
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#
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# * `https://cpan.metacpan.org/authors/id/M/MI/MIYAGAWA/Carton-v1.0.34.tar.gz`
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#
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# @api public
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class Cpan
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NICE_NAME = "CPAN"
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# The allowlist used to determine if the strategy applies to the URL.
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HOST_ALLOWLIST = ["cpan.metacpan.org"].freeze
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# Whether the strategy can be applied to the provided URL.
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#
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# @param url [String] the URL to match against
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# @return [Boolean]
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def self.match?(url)
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uri = URI.parse url
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HOST_ALLOWLIST.include? uri.host
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rescue URI::InvalidURIError
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false
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end
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# Generates a URL and regex (if one isn't provided) and passes them
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# to {PageMatch.find_versions} to identify versions in the content.
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#
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# @param url [String] the URL of the content to check
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# @param regex [Regexp] a regex used for matching versions in content
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# @return [Hash]
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def self.find_versions(url, regex = nil)
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%r{
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/authors/id/(?<author_path>(?:[^/](?:/[^/]+){2})) # The author path (e.g. M/MI/MIYAGAWA)
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/(?<package_path>.+) # The package path (e.g. Carton-v1.0.34.tar.gz)
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}ix =~ url
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# We need a Pathname because we've monkeypatched extname to support
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# double extensions (e.g. tar.gz).
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pathname = Pathname.new(package_path)
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# Exteract package name
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/^(?<package_name>.+)-v?\d+/ =~ pathname.basename(pathname.extname)
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# Use `\.t` instead of specific tarball extensions (e.g. .tar.gz)
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suffix = pathname.extname.sub!(/\.t(?:ar\..+|[a-z0-9]+)$/i, "\.t")
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# A page containing a directory listing of the latest source tarball
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package_dir = Pathname.new(author_path).join(pathname.dirname)
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page_url = "https://cpan.metacpan.org/authors/id/#{package_dir}/"
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# Example regex: `%r{href=.*?Carton-v?(\d+(?:\.\d+)*).t}i`
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regex ||= /href=.*?#{package_name}-v?(\d+(?:\.\d+)*)#{Regexp.escape(suffix)}/i
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Homebrew::Livecheck::Strategy::PageMatch.find_versions(page_url, regex)
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end
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end
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end
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end
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end
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