summaryrefslogtreecommitdiff
path: root/app/models/wiki_page.rb
blob: 25438581f2fb3b78a4631b7c818a318fcb90da43 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
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
188
189
190
191
192
193
194
195
196
197
198
199
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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
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
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
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
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
# frozen_string_literal: true

# rubocop:disable Rails/ActiveRecordAliases
class WikiPage
  include Gitlab::Utils::StrongMemoize

  PageChangedError = Class.new(StandardError)
  PageRenameError = Class.new(StandardError)
  FrontMatterTooLong = Class.new(StandardError)

  include ActiveModel::Validations
  include ActiveModel::Conversion
  include StaticModel
  extend ActiveModel::Naming

  delegate :content, :front_matter, to: :parsed_content

  def self.primary_key
    'slug'
  end

  def self.model_name
    ActiveModel::Name.new(self, nil, 'wiki')
  end

  def eql?(other)
    return false unless other.present? && other.is_a?(self.class)

    slug == other.slug && wiki.container == other.wiki.container
  end

  alias_method :==, :eql?

  def self.unhyphenize(name)
    name.gsub(/-+/, ' ')
  end

  def to_key
    [:slug]
  end

  validates :title, presence: true
  validate :validate_path_limits, if: :title_changed?
  validate :validate_content_size_limit, if: :content_changed?

  # The GitLab Wiki instance.
  attr_reader :wiki
  delegate :container, to: :wiki

  # The raw Gitlab::Git::WikiPage instance.
  attr_reader :page

  # The attributes Hash used for storing and validating
  # new Page values before writing to the raw repository.
  attr_accessor :attributes

  def hook_attrs
    Gitlab::HookData::WikiPageBuilder.new(self).build
  end

  # Construct a new WikiPage
  #
  # @param [Wiki] wiki
  # @param [Gitlab::Git::WikiPage] page
  def initialize(wiki, page = nil)
    @wiki       = wiki
    @page       = page
    @attributes = {}.with_indifferent_access

    set_attributes if persisted?
  end

  # The escaped URL path of this page.
  def slug
    attributes[:slug].presence || wiki.wiki.preview_slug(title, format)
  end
  alias_method :id, :slug # required to use build_stubbed

  alias_method :to_param, :slug

  def human_title
    return 'Home' if title == Wiki::HOMEPAGE

    title
  end

  # The formatted title of this page.
  def title
    attributes[:title] || ''
  end

  # Sets the title of this page.
  def title=(new_title)
    attributes[:title] = new_title
  end

  def raw_content
    attributes[:content] ||= page&.text_data
  end

  # The hierarchy of the directory this page is contained in.
  def directory
    wiki.page_title_and_dir(slug)&.last.to_s
  end

  # The markup format for the page.
  def format
    attributes[:format] || :markdown
  end

  # The commit message for this page version.
  def message
    version.try(:message)
  end

  # The GitLab Commit instance for this page.
  def version
    return unless persisted?

    @version ||= @page.version
  end

  def path
    return unless persisted?

    @path ||= @page.path
  end

  # Returns a CommitCollection
  #
  # Queries the commits for current page's path, equivalent to
  # `git log path/to/page`. Filters and options supported:
  # https://gitlab.com/gitlab-org/gitaly/-/blob/master/proto/commit.proto#L322-344
  def versions(options = {})
    return [] unless persisted?

    default_per_page = Kaminari.config.default_per_page
    offset = [options[:page].to_i - 1, 0].max * options.fetch(:per_page, default_per_page)

    wiki.repository.commits('HEAD',
                            path: page.path,
                            limit: options.fetch(:limit, default_per_page),
                            offset: offset)
  end

  def count_versions
    return [] unless persisted?

    wiki.wiki.count_page_versions(page.path)
  end

  def last_version
    @last_version ||= versions(limit: 1).first
  end

  def last_commit_sha
    last_version&.sha
  end

  # Returns boolean True or False if this instance
  # is an old version of the page.
  def historical?
    return false unless last_commit_sha && version

    page.historical? && last_commit_sha != version.sha
  end

  # Returns boolean True or False if this instance
  # is the latest commit version of the page.
  def latest?
    !historical?
  end

  # Returns boolean True or False if this instance
  # has been fully created on disk or not.
  def persisted?
    page.present?
  end

  # Creates a new Wiki Page.
  #
  # attr - Hash of attributes to set on the new page.
  #       :title   - The title (optionally including dir) for the new page.
  #       :content - The raw markup content.
  #       :format  - Optional symbol representing the
  #                  content format. Can be any type
  #                  listed in the Wiki::MARKUPS
  #                  Hash.
  #       :message - Optional commit message to set on
  #                  the new page.
  #
  # Returns the String SHA1 of the newly created page
  # or False if the save was unsuccessful.
  def create(attrs = {})
    update_attributes(attrs)

    save do
      wiki.create_page(title, content, format, attrs[:message])
    end
  end

  # Updates an existing Wiki Page, creating a new version.
  #
  # attrs - Hash of attributes to be updated on the page.
  #        :content         - The raw markup content to replace the existing.
  #        :format          - Optional symbol representing the content format.
  #                           See Wiki::MARKUPS Hash for available formats.
  #        :message         - Optional commit message to set on the new version.
  #        :last_commit_sha - Optional last commit sha to validate the page unchanged.
  #        :title           - The Title (optionally including dir) to replace existing title
  #
  # Returns the String SHA1 of the newly created page
  # or False if the save was unsuccessful.
  def update(attrs = {})
    last_commit_sha = attrs.delete(:last_commit_sha)

    if last_commit_sha && last_commit_sha != self.last_commit_sha
      raise PageChangedError, s_(
        'WikiPageConflictMessage|Someone edited the page the same time you did. Please check out %{wikiLinkStart}the page%{wikiLinkEnd} and make sure your changes will not unintentionally remove theirs.')
    end

    update_attributes(attrs)

    if title.present? && title_changed? && wiki.find_page(title).present?
      attributes[:title] = page.title
      raise PageRenameError, s_('WikiEdit|There is already a page with the same title in that path.')
    end

    save do
      wiki.update_page(
        page,
        content: raw_content,
        format: format,
        message: attrs[:message],
        title: title
      )
    end
  end

  # Destroys the Wiki Page.
  #
  # Returns boolean True or False.
  def delete
    if wiki.delete_page(page)
      true
    else
      false
    end
  end

  # Relative path to the partial to be used when rendering collections
  # of this object.
  def to_partial_path
    '../shared/wikis/wiki_page'
  end

  def sha
    page.version&.sha
  end

  def title_changed?
    if persisted?
      # A page's `title` will be returned from Gollum/Gitaly with any +<>
      # characters changed to -, whereas the `path` preserves these characters.
      path_without_extension = Pathname(page.path).sub_ext('').to_s
      old_title, old_dir = wiki.page_title_and_dir(self.class.unhyphenize(path_without_extension))
      new_title, new_dir = wiki.page_title_and_dir(self.class.unhyphenize(title))

      new_title != old_title || (title.include?('/') && new_dir != old_dir)
    else
      title.present?
    end
  end

  def content_changed?
    if persisted?
      # gollum-lib always converts CRLFs to LFs in Gollum::Wiki#normalize,
      # so we need to do the same here.
      # Also see https://gitlab.com/gitlab-org/gitlab/-/issues/21431
      raw_content.delete("\r") != page&.text_data
    else
      raw_content.present?
    end
  end

  # Updates the current @attributes hash by merging a hash of params
  def update_attributes(attrs)
    attrs[:title] = process_title(attrs[:title]) if attrs[:title].present?
    update_front_matter(attrs)

    attrs.slice!(:content, :format, :message, :title)
    clear_memoization(:parsed_content) if attrs.has_key?(:content)

    attributes.merge!(attrs)
  end

  def to_ability_name
    'wiki_page'
  end

  def version_commit_timestamp
    version&.commit&.committed_date
  end

  def diffs(diff_options = {})
    Gitlab::Diff::FileCollection::WikiPage.new(self, diff_options: diff_options)
  end

  private

  def serialize_front_matter(hash)
    return '' unless hash.present?

    YAML.dump(hash.transform_keys(&:to_s)) + "---\n"
  end

  def update_front_matter(attrs)
    return unless Gitlab::WikiPages::FrontMatterParser.enabled?(container)
    return unless attrs.has_key?(:front_matter)

    fm_yaml = serialize_front_matter(attrs[:front_matter])
    raise FrontMatterTooLong if fm_yaml.size > Gitlab::WikiPages::FrontMatterParser::MAX_FRONT_MATTER_LENGTH

    attrs[:content] = fm_yaml + (attrs[:content].presence || content)
  end

  def parsed_content
    strong_memoize(:parsed_content) do
      Gitlab::WikiPages::FrontMatterParser.new(raw_content, container).parse
    end
  end

  # Process and format the title based on the user input.
  def process_title(title)
    return if title.blank?

    title = deep_title_squish(title)
    current_dirname = File.dirname(title)

    if persisted?
      return title[1..-1] if current_dirname == '/'
      return File.join([directory.presence, title].compact) if current_dirname == '.'
    end

    title
  end

  # This method squishes all the filename
  # i.e: '   foo   /  bar  / page_name' => 'foo/bar/page_name'
  def deep_title_squish(title)
    components = title.split(File::SEPARATOR).map(&:squish)

    File.join(components)
  end

  def set_attributes
    attributes[:slug] = @page.url_path
    attributes[:title] = @page.title
    attributes[:format] = @page.format
  end

  def save
    return false unless valid?

    unless yield
      errors.add(:base, wiki.error_message)
      return false
    end

    @page = wiki.find_page(title).page
    set_attributes

    true
  end

  def validate_path_limits
    return unless title.present?

    *dirnames, filename = title.split('/')

    if filename && filename.bytesize > Gitlab::WikiPages::MAX_TITLE_BYTES
      errors.add(:title, _("exceeds the limit of %{bytes} bytes") % {
        bytes: Gitlab::WikiPages::MAX_TITLE_BYTES
      })
    end

    invalid_dirnames = dirnames.select { |d| d.bytesize > Gitlab::WikiPages::MAX_DIRECTORY_BYTES }
    invalid_dirnames.each do |dirname|
      errors.add(:title, _('exceeds the limit of %{bytes} bytes for directory name "%{dirname}"') % {
        bytes: Gitlab::WikiPages::MAX_DIRECTORY_BYTES,
        dirname: dirname
      })
    end
  end

  def validate_content_size_limit
    current_value = raw_content.to_s.bytesize
    max_size = Gitlab::CurrentSettings.wiki_page_max_content_bytes
    return if current_value <= max_size

    errors.add(:content, _('is too long (%{current_value}). The maximum size is %{max_size}.') % {
      current_value: ActiveSupport::NumberHelper.number_to_human_size(current_value),
      max_size: ActiveSupport::NumberHelper.number_to_human_size(max_size)
    })
  end
end