297 lines
10 KiB
Ruby
297 lines
10 KiB
Ruby
# frozen_string_literal: true
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module Banzai
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module Filter
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module References
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# Issues, merge requests, Snippets, Commits and Commit Ranges share
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# similar functionality in reference filtering.
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class AbstractReferenceFilter < ReferenceFilter
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include CrossProjectReference
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def initialize(doc, context = nil, result = nil)
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super
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@reference_cache = ReferenceCache.new(self, context)
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end
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# REFERENCE_PLACEHOLDER is used for re-escaping HTML text except found
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# reference (which we replace with placeholder during re-scaping). The
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# random number helps ensure it's pretty close to unique. Since it's a
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# transitory value (it never gets saved) we can initialize once, and it
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# doesn't matter if it changes on a restart.
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REFERENCE_PLACEHOLDER = "_reference_#{SecureRandom.hex(16)}_"
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REFERENCE_PLACEHOLDER_PATTERN = %r{#{REFERENCE_PLACEHOLDER}(\d+)}.freeze
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# Public: Find references in text (like `!123` for merge requests)
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#
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# references_in(text) do |match, id, project_ref, matches|
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# object = find_object(project_ref, id)
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# "<a href=...>#{object.to_reference}</a>"
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# end
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#
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# text - String text to search.
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#
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# Yields the String match, the Integer referenced object ID, an optional String
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# of the external project reference, and all of the matchdata.
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#
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# Returns a String replaced with the return of the block.
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def references_in(text, pattern = object_class.reference_pattern)
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text.gsub(pattern) do |match|
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if ident = identifier($~)
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yield match, ident, $~[:project], $~[:namespace], $~
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else
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match
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end
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end
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end
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def identifier(match_data)
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symbol = symbol_from_match(match_data)
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parse_symbol(symbol, match_data) if object_class.reference_valid?(symbol)
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end
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def symbol_from_match(match)
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key = object_sym
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match[key] if match.names.include?(key.to_s)
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end
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# Transform a symbol extracted from the text to a meaningful value
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# In most cases these will be integers, so we call #to_i by default
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#
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# This method has the contract that if a string `ref` refers to a
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# record `record`, then `parse_symbol(ref) == record_identifier(record)`.
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def parse_symbol(symbol, match_data)
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symbol.to_i
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end
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# We assume that most classes are identifying records by ID.
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#
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# This method has the contract that if a string `ref` refers to a
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# record `record`, then `class.parse_symbol(ref) == record_identifier(record)`.
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def record_identifier(record)
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record.id
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end
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# Implement in child class
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# Example: project.merge_requests.find
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def find_object(parent_object, id)
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raise NotImplementedError, "#{self.class} must implement method: #{__callee__}"
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end
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# Override if the link reference pattern produces a different ID (global
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# ID vs internal ID, for instance) to the regular reference pattern.
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def find_object_from_link(parent_object, id)
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find_object(parent_object, id)
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end
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# Implement in child class
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# Example: project_merge_request_url
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def url_for_object(object, parent_object)
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raise NotImplementedError, "#{self.class} must implement method: #{__callee__}"
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end
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def find_object_cached(parent_object, id)
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cached_call(:banzai_find_object, id, path: [object_class, parent_object.id]) do
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find_object(parent_object, id)
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end
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end
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def find_object_from_link_cached(parent_object, id)
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cached_call(:banzai_find_object_from_link, id, path: [object_class, parent_object.id]) do
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find_object_from_link(parent_object, id)
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end
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end
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def from_ref_cached(ref)
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cached_call("banzai_#{parent_type}_refs".to_sym, ref) do
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parent_from_ref(ref)
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end
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end
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def url_for_object_cached(object, parent_object)
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cached_call(:banzai_url_for_object, object, path: [object_class, parent_object.id]) do
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url_for_object(object, parent_object)
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end
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end
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def call
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return doc unless project || group || user
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reference_cache.load_reference_cache(nodes) if respond_to?(:parent_records)
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ref_pattern = object_reference_pattern
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link_pattern = object_class.link_reference_pattern
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# Compile often used regexps only once outside of the loop
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ref_pattern_anchor = /\A#{ref_pattern}\z/
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link_pattern_start = /\A#{link_pattern}/
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link_pattern_anchor = /\A#{link_pattern}\z/
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nodes.each_with_index do |node, index|
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if text_node?(node) && ref_pattern
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replace_text_when_pattern_matches(node, index, ref_pattern) do |content|
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object_link_filter(content, ref_pattern)
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end
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elsif element_node?(node)
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yield_valid_link(node) do |link, inner_html|
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if ref_pattern && link =~ ref_pattern_anchor
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replace_link_node_with_href(node, index, link) do
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object_link_filter(link, ref_pattern, link_content: inner_html)
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end
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next
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end
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next unless link_pattern
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if link == inner_html && inner_html =~ link_pattern_start
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replace_link_node_with_text(node, index) do
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object_link_filter(inner_html, link_pattern, link_reference: true)
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end
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next
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end
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if link =~ link_pattern_anchor
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replace_link_node_with_href(node, index, link) do
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object_link_filter(link, link_pattern, link_content: inner_html, link_reference: true)
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end
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next
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end
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end
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end
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end
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doc
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end
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# Replace references (like `!123` for merge requests) in text with links
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# to the referenced object's details page.
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#
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# text - String text to replace references in.
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# pattern - Reference pattern to match against.
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# link_content - Original content of the link being replaced.
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# link_reference - True if this was using the link reference pattern,
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# false otherwise.
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#
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# Returns a String with references replaced with links. All links
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# have `gfm` and `gfm-OBJECT_NAME` class names attached for styling.
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def object_link_filter(text, pattern, link_content: nil, link_reference: false)
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references_in(text, pattern) do |match, id, project_ref, namespace_ref, matches|
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parent_path = if parent_type == :group
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reference_cache.full_group_path(namespace_ref)
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else
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reference_cache.full_project_path(namespace_ref, project_ref)
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end
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parent = from_ref_cached(parent_path)
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if parent
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object =
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if link_reference
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find_object_from_link_cached(parent, id)
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else
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find_object_cached(parent, id)
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end
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end
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if object
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title = object_link_title(object, matches)
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klass = reference_class(object_sym)
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data_attributes = data_attributes_for(link_content || match, parent, object,
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link_content: !!link_content,
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link_reference: link_reference)
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data = data_attribute(data_attributes)
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url =
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if matches.names.include?("url") && matches[:url]
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matches[:url]
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else
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url_for_object_cached(object, parent)
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end
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content = link_content || object_link_text(object, matches)
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link = %(<a href="#{url}" #{data}
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title="#{escape_once(title)}"
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class="#{klass}">#{content}</a>)
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wrap_link(link, object)
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else
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match
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end
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end
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end
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def wrap_link(link, object)
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link
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end
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def data_attributes_for(text, parent, object, link_content: false, link_reference: false)
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object_parent_type = parent.is_a?(Group) ? :group : :project
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{
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original: escape_html_entities(text),
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link: link_content,
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link_reference: link_reference,
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object_parent_type => parent.id,
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object_sym => object.id
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}
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end
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def object_link_text_extras(object, matches)
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extras = []
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if matches.names.include?("anchor") && matches[:anchor] && matches[:anchor] =~ /\A\#note_(\d+)\z/
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extras << "comment #{Regexp.last_match(1)}"
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end
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extension = matches[:extension] if matches.names.include?("extension")
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extras << extension if extension
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extras
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end
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def object_link_title(object, matches)
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object.title
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end
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def object_link_text(object, matches)
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parent = project || group || user
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text = object.reference_link_text(parent)
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extras = object_link_text_extras(object, matches)
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text += " (#{extras.join(", ")})" if extras.any?
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text
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end
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def parent_type
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:project
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end
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def parent
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parent_type == :project ? project : group
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end
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private
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attr_accessor :reference_cache
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def escape_with_placeholders(text, placeholder_data)
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escaped = escape_html_entities(text)
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escaped.gsub(REFERENCE_PLACEHOLDER_PATTERN) do |match|
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placeholder_data[Regexp.last_match(1).to_i]
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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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end
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