61 lines
1.8 KiB
Ruby
61 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module Banzai
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module Filter
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class WikiLinkFilter < HTML::Pipeline::Filter
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class Rewriter
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def initialize(link_string, wiki:, slug:)
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@uri = Addressable::URI.parse(link_string)
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@wiki_base_path = wiki && wiki.wiki_base_path
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@slug = slug
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end
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def apply_rules
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# Special case: relative URLs beginning with `/uploads/` refer to
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# user-uploaded files will be handled elsewhere.
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return @uri.to_s if public_upload?
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# Special case: relative URLs beginning with Wikis::CreateAttachmentService::ATTACHMENT_PATH
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# refer to user-uploaded files to the wiki repository.
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unless repository_upload?
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apply_file_link_rules!
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apply_hierarchical_link_rules!
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end
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apply_relative_link_rules!
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@uri.to_s
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end
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private
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# Of the form 'file.md'
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def apply_file_link_rules!
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@uri = Addressable::URI.join(@slug, @uri) if @uri.extname.present?
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end
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# Of the form `./link`, `../link`, or similar
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def apply_hierarchical_link_rules!
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@uri = Addressable::URI.join(@slug, @uri) if @uri.to_s[0] == '.'
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end
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# Any link _not_ of the form `http://example.com/`
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def apply_relative_link_rules!
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if @uri.relative? && @uri.path.present?
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link = ::File.join(@wiki_base_path, @uri.path)
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link = "#{link}##{@uri.fragment}" if @uri.fragment
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@uri = Addressable::URI.parse(link)
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end
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end
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def public_upload?
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@uri.relative? && @uri.path.starts_with?('/uploads/')
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end
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def repository_upload?
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@uri.relative? && @uri.path.starts_with?(Wikis::CreateAttachmentService::ATTACHMENT_PATH)
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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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