47 lines
1.2 KiB
Ruby
47 lines
1.2 KiB
Ruby
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# frozen_string_literal: true
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module Gitlab
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module Utils
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# Parses Link http headers (as defined in https://www.rfc-editor.org/rfc/rfc5988.txt)
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#
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# The URI-references with their relation type are extracted and returned as a hash
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# Example:
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#
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# header = '<http://test.org/TheBook/chapter2>; rel="previous", <http://test.org/TheBook/chapter4>; rel="next"'
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#
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# Gitlab::Utils::LinkHeaderParser.new(header).parse
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# {
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# previous: {
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# uri: #<URI::HTTP http://test.org/TheBook/chapter2>
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# },
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# next: {
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# uri: #<URI::HTTP http://test.org/TheBook/chapter4>
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# }
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# }
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class LinkHeaderParser
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REL_PATTERN = %r{rel="(\w+)"}.freeze
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# to avoid parse really long URIs we limit the amount of characters allowed
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URI_PATTERN = %r{<(.{1,500})>}.freeze
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def initialize(header)
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@header = header
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end
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def parse
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return {} if @header.blank?
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links = @header.split(',')
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result = {}
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links.each do |link|
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direction = link[REL_PATTERN, 1]&.to_sym
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uri = link[URI_PATTERN, 1]
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result[direction] = { uri: URI(uri) } if direction && uri
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end
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result
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end
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end
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end
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end
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