Class: Banzai::Filter::AbstractReferenceFilter

Inherits:
ReferenceFilter
  • Object
show all
Includes:
CrossProjectReference
Defined in:
lib/banzai/filter/abstract_reference_filter.rb

Overview

Issues, Merge Requests, Snippets, Commits and Commit Ranges share similar functionality in reference filtering.

Constant Summary collapse

REFERENCE_PLACEHOLDER =

REFERENCE_PLACEHOLDER is used for re-escaping HTML text except found reference (which we replace with placeholder during re-scaping). The random number helps ensure it's pretty close to unique. Since it's a transitory value (it never gets saved) we can initialize once, and it doesn't matter if it changes on a restart.

"_reference_#{SecureRandom.hex(16)}_"
REFERENCE_PLACEHOLDER_PATTERN = 
%r{#{REFERENCE_PLACEHOLDER}(\d+)}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Methods included from CrossProjectReference

#parent_from_ref

Methods inherited from ReferenceFilter

call, #call_and_update_nodes, #data_attribute, #each_node, #element_node?, #group, #ignore_ancestor_query, #initialize, #nodes, #project, #reference_class, #replace_link_node_with_href, #replace_link_node_with_text, #replace_text_when_pattern_matches, #skip_project_check?, #text_node?, #user, #validate, #yield_valid_link

Methods included from OutputSafety

#escape_once

Methods included from RequestStoreReferenceCache

#cached_call, #get_or_set_cache

Constructor Details

This class inherits a constructor from Banzai::Filter::ReferenceFilter

Class Method Details

.identifier(match_data) ⇒ Object 


54
55
56
57
58
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 54

def self.identifier(match_data)
  symbol = symbol_from_match(match_data)

  parse_symbol(symbol, match_data) if object_class.reference_valid?(symbol)
end

.object_class ⇒ Object 


18
19
20
21
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 18

def self.object_class
  # Implement in child class
  # Example: MergeRequest
end

.object_name ⇒ Object 


23
24
25
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 23

def self.object_name
  @object_name ||= object_class.name.underscore
end

.object_sym ⇒ Object 


27
28
29
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 27

def self.object_sym
  @object_sym ||= object_name.to_sym
end

.parse_symbol(symbol, match_data) ⇒ Object

Transform a symbol extracted from the text to a meaningful value In most cases these will be integers, so we call #to_i by default

This method has the contract that if a string `ref` refers to a record `record`, then `parse_symbol(ref) == record_identifier(record)`.


74
75
76
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 74

def self.parse_symbol(symbol, match_data)
  symbol.to_i
end

.references_in(text, pattern = object_class.reference_pattern) ⇒ Object

Public: Find references in text (like `!123` for merge requests)

AnyReferenceFilter.references_in(text) do |match, id, project_ref, matches|
  object = find_object(project_ref, id)
  "<a href=...>#{object.to_reference}</a>"
end

text - String text to search.

Yields the String match, the Integer referenced object ID, an optional String of the external project reference, and all of the matchdata.

Returns a String replaced with the return of the block.


44
45
46
47
48
49
50
51
52
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 44

def self.references_in(text, pattern = object_class.reference_pattern)
  text.gsub(pattern) do |match|
    if ident = identifier($~)
      yield match, ident, $~[:project], $~[:namespace], $~
    else
      match
    end
  end
end

.symbol_from_match(match) ⇒ Object 


64
65
66
67
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 64

def self.symbol_from_match(match)
  key = object_sym
  match[key] if match.names.include?(key.to_s)
end

Instance Method Details

#call ⇒ Object 


138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 138

def call
  return doc unless project || group || user

  ref_pattern = object_class.reference_pattern
  link_pattern = object_class.link_reference_pattern

  # Compile often used regexps only once outside of the loop
  ref_pattern_anchor = /\A#{ref_pattern}\z/
  link_pattern_start = /\A#{link_pattern}/
  link_pattern_anchor = /\A#{link_pattern}\z/

  nodes.each_with_index do |node, index|
    if text_node?(node) && ref_pattern
      replace_text_when_pattern_matches(node, index, ref_pattern) do |content|
        object_link_filter(content, ref_pattern)
      end

    elsif element_node?(node)
      yield_valid_link(node) do |link, inner_html|
        if ref_pattern && link =~ ref_pattern_anchor
          replace_link_node_with_href(node, index, link) do
            object_link_filter(link, ref_pattern, link_content: inner_html)
          end

          next
        end

        next unless link_pattern

        if link == inner_html && inner_html =~ link_pattern_start
          replace_link_node_with_text(node, index) do
            object_link_filter(inner_html, link_pattern, link_reference: true)
          end

          next
        end

        if link =~ link_pattern_anchor
          replace_link_node_with_href(node, index, link) do
            object_link_filter(link, link_pattern, link_content: inner_html, link_reference: true)
          end

          next
        end
      end
    end
  end

  doc
end

#current_parent_path ⇒ Object 


374
375
376
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 374

def current_parent_path
  @current_parent_path ||= parent&.full_path
end

#current_project_namespace_path ⇒ Object 


378
379
380
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 378

def current_project_namespace_path
  @current_project_namespace_path ||= project&.namespace&.full_path
end

#data_attributes_for(text, parent, object, link_content: false, link_reference: false) ⇒ Object 


252
253
254
255
256
257
258
259
260
261
262
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 252

def data_attributes_for(text, parent, object, link_content: false, link_reference: false)
  object_parent_type = parent.is_a?(Group) ? :group : :project

  {
    original:             escape_html_entities(text),
    link:                 link_content,
    link_reference:       link_reference,
    object_parent_type => parent.id,
    object_sym =>         object.id
  }
end

#find_for_paths(paths) ⇒ Object

Returns projects for the given paths.


347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 347

def find_for_paths(paths)
  if Gitlab::SafeRequestStore.active?
    cache = refs_cache
    to_query = paths - cache.keys

    unless to_query.empty?
      records = relation_for_paths(to_query)

      found = []
      records.each do |record|
        ref = record.full_path
        get_or_set_cache(cache, ref) { record }
        found << ref
      end

      not_found = to_query - found
      not_found.each do |ref|
        get_or_set_cache(cache, ref) { nil }
      end
    end

    cache.slice(*paths).values.compact
  else
    relation_for_paths(paths)
  end
end

#find_object(parent_object, id) ⇒ Object

Implement in child class Example: project.merge_requests.find


100
101
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 100

def find_object(parent_object, id)
end

#find_object_cached(parent_object, id) ⇒ Object 


114
115
116
117
118
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 114

def find_object_cached(parent_object, id)
  cached_call(:banzai_find_object, id, path: [object_class, parent_object.id]) do
    find_object(parent_object, id)
  end
end

#find_object_from_link(parent_object, id) ⇒ Object

Override if the link reference pattern produces a different ID (global ID vs internal ID, for instance) to the regular reference pattern.


105
106
107
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 105

def find_object_from_link(parent_object, id)
  find_object(parent_object, id)
end

#find_object_from_link_cached(parent_object, id) ⇒ Object 


120
121
122
123
124
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 120

def find_object_from_link_cached(parent_object, id)
  cached_call(:banzai_find_object_from_link, id, path: [object_class, parent_object.id]) do
    find_object_from_link(parent_object, id)
  end
end

#from_ref_cached(ref) ⇒ Object 


126
127
128
129
130
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 126

def from_ref_cached(ref)
  cached_call("banzai_#{parent_type}_refs".to_sym, ref) do
    parent_from_ref(ref)
  end
end

#identifier(match_data) ⇒ Object 


60
61
62
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 60

def identifier(match_data)
  self.class.identifier(match_data)
end

#object_class ⇒ Object 


86
87
88
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 86

def object_class
  self.class.object_class
end

#object_link_filter(text, pattern, link_content: nil, link_reference: false) ⇒ Object

Replace references (like `!123` for merge requests) in text with links to the referenced object's details page.

text - String text to replace references in. pattern - Reference pattern to match against. link_content - Original content of the link being replaced. link_reference - True if this was using the link reference pattern,

false otherwise.

Returns a String with references replaced with links. All links have `gfm` and `gfm-OBJECT_NAME` class names attached for styling.


200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 200

def object_link_filter(text, pattern, link_content: nil, link_reference: false)
  references_in(text, pattern) do |match, id, project_ref, namespace_ref, matches|
    parent_path = if parent_type == :group
                    full_group_path(namespace_ref)
                  else
                    full_project_path(namespace_ref, project_ref)
                  end

    parent = from_ref_cached(parent_path)

    if parent
      object =
        if link_reference
          find_object_from_link_cached(parent, id)
        else
          find_object_cached(parent, id)
        end
    end

    if object
      title = object_link_title(object, matches)
      klass = reference_class(object_sym)

      data_attributes = data_attributes_for(link_content || match, parent, object,
                                            link_content: !!link_content,
                                            link_reference: link_reference)
      data = data_attribute(data_attributes)

      url =
        if matches.names.include?("url") && matches[:url]
          matches[:url]
        else
          url_for_object_cached(object, parent)
        end

      content = link_content || object_link_text(object, matches)

      link = %(<a href="#{url}" #{data}
                  title="#{escape_once(title)}"
                  class="#{klass}">#{content}</a>)

      wrap_link(link, object)
    else
      match
    end
  end
end

#object_link_text(object, matches) ⇒ Object 


282
283
284
285
286
287
288
289
290
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 282

def object_link_text(object, matches)
  parent = project || group || user
  text = object.reference_link_text(parent)

  extras = object_link_text_extras(object, matches)
  text += " (#{extras.join(", ")})" if extras.any?

  text
end

#object_link_text_extras(object, matches) ⇒ Object 


264
265
266
267
268
269
270
271
272
273
274
275
276
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 264

def object_link_text_extras(object, matches)
  extras = []

  if matches.names.include?("anchor") && matches[:anchor] && matches[:anchor] =~ /\A\#note_(\d+)\z/
    extras << "comment #{Regexp.last_match(1)}"
  end

  extension = matches[:extension] if matches.names.include?("extension")

  extras << extension if extension

  extras
end

#object_link_title(object, matches) ⇒ Object 


278
279
280
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 278

def object_link_title(object, matches)
  object.title
end

#object_sym ⇒ Object 


90
91
92
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 90

def object_sym
  self.class.object_sym
end

#parent_per_reference ⇒ Object

Returns a Hash containing referenced projects grouped per their full path.


324
325
326
327
328
329
330
331
332
333
334
335
336
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 324

def parent_per_reference
  @per_reference ||= {}

  @per_reference[parent_type] ||= begin
    refs = Set.new

    references_per_parent.each do |ref, _|
      refs << ref
    end

    find_for_paths(refs.to_a).index_by(&:full_path)
  end
end

#record_identifier(record) ⇒ Object

We assume that most classes are identifying records by ID.

This method has the contract that if a string `ref` refers to a record `record`, then `class.parse_symbol(ref) == record_identifier(record)`.


82
83
84
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 82

def record_identifier(record)
  record.id
end

#records_per_parent ⇒ Object 


382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 382

def records_per_parent
  @_records_per_project ||= {}

  @_records_per_project[object_class.to_s.underscore] ||= begin
    hash = Hash.new { |h, k| h[k] = {} }

    parent_per_reference.each do |path, parent|
      record_ids = references_per_parent[path]

      parent_records(parent, record_ids).each do |record|
        hash[parent][record_identifier(record)] = record
      end
    end

    hash
  end
end

#references_in(*args, &block) ⇒ Object 


94
95
96
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 94

def references_in(*args, &block)
  self.class.references_in(*args, &block)
end

#references_per_parent ⇒ Object

Returns a Hash containing all object references (e.g. issue IDs) per the project they belong to.


294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 294

def references_per_parent
  @references_per ||= {}

  @references_per[parent_type] ||= begin
    refs = Hash.new { |hash, key| hash[key] = Set.new }
    regex = [
      object_class.link_reference_pattern,
      object_class.reference_pattern
    ].compact.reduce { |a, b| Regexp.union(a, b) }

    nodes.each do |node|
      node.to_html.scan(regex) do
        path = if parent_type == :project
                 full_project_path($~[:namespace], $~[:project])
               else
                 full_group_path($~[:group])
               end

        if ident = identifier($~)
          refs[path] << ident
        end
      end
    end

    refs
  end
end

#relation_for_paths(paths) ⇒ Object 


338
339
340
341
342
343
344
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 338

def relation_for_paths(paths)
  klass = parent_type.to_s.camelize.constantize
  result = klass.where_full_path_in(paths)
  return result if parent_type == :group

  result.includes(:namespace) if parent_type == :project
end

#url_for_object(object, parent_object) ⇒ Object

Implement in child class Example: project_merge_request_url


111
112
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 111

def url_for_object(object, parent_object)
end

#url_for_object_cached(object, parent_object) ⇒ Object 


132
133
134
135
136
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 132

def url_for_object_cached(object, parent_object)
  cached_call(:banzai_url_for_object, object, path: [object_class, parent_object.id]) do
    url_for_object(object, parent_object)
  end
end

#wrap_link(link, object) ⇒ Object 


248
249
250
 
# File 'lib/banzai/filter/abstract_reference_filter.rb', line 248

def wrap_link(link, object)
  link
end