32 lines
878 B
Crystal
32 lines
878 B
Crystal
class ArticleIdParser
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include Monads
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ID_REGEX = /[\/\-]([0-9a-f]+)\/?$/i
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def self.parse(request : HTTP::Request)
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new.parse(request)
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end
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def parse(request : HTTP::Request) : Maybe
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from_params = post_id_from_params(request.query_params)
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from_path = post_id_from_path(request.path)
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from_params.or(from_path)
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end
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private def post_id_from_path(request_path : String)
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return Nothing(String).new if request_path.starts_with?("/tag/")
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Try(Regex::MatchData)
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.new(->{ request_path.match(ID_REGEX) })
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.to_maybe
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.fmap(->(matches : Regex::MatchData) { matches[1] })
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end
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private def post_id_from_params(params : URI::Params)
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maybe_uri = Try(String)
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.new(->{ params["redirectUrl"] })
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.to_maybe
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.fmap(->(url : String) { URI.parse(url) })
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.bind(->(uri : URI) { post_id_from_path(uri.path) })
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end
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end
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