summaryrefslogtreecommitdiff
path: root/app/models/wiki.rb
blob: d28a73b644f98f2a3134d8ca22467b089b78adec (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
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
# frozen_string_literal: true

class Wiki
  extend ::Gitlab::Utils::Override
  include HasRepository
  include Repositories::CanHousekeepRepository
  include Gitlab::Utils::StrongMemoize
  include GlobalID::Identification

  extend ActiveModel::Naming

  MARKUPS = { # rubocop:disable Style/MultilineIfModifier
    markdown: {
      name: 'Markdown',
      default_extension: :md,
      extension_regex: Regexp.new('md|mkdn?|mdown|markdown', 'i'),
      created_by_user: true
    },
    rdoc: {
      name: 'RDoc',
      default_extension: :rdoc,
      extension_regex: Regexp.new('rdoc', 'i'),
      created_by_user: true
    },
    asciidoc: {
      name: 'AsciiDoc',
      default_extension: :asciidoc,
      extension_regex: Regexp.new('adoc|asciidoc', 'i'),
      created_by_user: true
    },
    org: {
      name: 'Org',
      default_extension: :org,
      extension_regex: Regexp.new('org', 'i'),
      created_by_user: true
    },
    textile: {
      name: 'Textile',
      default_extension: :textile,
      extension_regex: Regexp.new('textile', 'i')
    },
    creole: {
      name: 'Creole',
      default_extension: :creole,
      extension_regex: Regexp.new('creole', 'i')
    },
    rest: {
      name: 'reStructuredText',
      default_extension: :rst,
      extension_regex: Regexp.new('re?st(\.txt)?', 'i')
    },
    mediawiki: {
      name: 'MediaWiki',
      default_extension: :mediawiki,
      extension_regex: Regexp.new('(media)?wiki', 'i')
    },
    pod: {
      name: 'Pod',
      default_extension: :pod,
      extension_regex: Regexp.new('pod', 'i')
    },
    plaintext: {
      name: 'Plain Text',
      default_extension: :txt,
      extension_regex: Regexp.new('txt', 'i')
    }
  }.freeze unless defined?(MARKUPS)

  VALID_USER_MARKUPS = MARKUPS.select { |_, v| v[:created_by_user] }.freeze unless defined?(VALID_USER_MARKUPS)

  unless defined?(ALLOWED_EXTENSIONS_REGEX)
    ALLOWED_EXTENSIONS_REGEX = Regexp.union(MARKUPS.map { |key, value| value[:extension_regex] }).freeze
  end

  CouldNotCreateWikiError = Class.new(StandardError)

  HOMEPAGE = 'home'
  SIDEBAR = '_sidebar'

  TITLE_ORDER = 'title'
  CREATED_AT_ORDER = 'created_at'
  DIRECTION_DESC = 'desc'
  DIRECTION_ASC = 'asc'

  attr_reader :container, :user

  # Returns a string describing what went wrong after
  # an operation fails.
  attr_reader :error_message

  # Support run_after_commit callbacks, since we don't have a DB record
  # we delegate to the container.
  delegate :run_after_commit, to: :container

  class << self
    attr_accessor :container_class

    def for_container(container, user = nil)
      "#{container.class.name}Wiki".constantize.new(container, user)
    end

    # This is needed to support repository lookup through Gitlab::GlRepository::Identifier
    def find_by_id(container_id)
      container_class.find_by_id(container_id)&.wiki
    end
  end

  def initialize(container, user = nil)
    raise ArgumentError, "user must be a User, got #{user.class}" if user && !user.is_a?(User)

    @container = container
    @user = user
  end

  def ==(other)
    other.is_a?(self.class) && container == other.container
  end

  # This is needed in:
  # - Storage::Hashed
  # - Gitlab::GlRepository::RepoType#identifier_for_container
  #
  # We also need an `#id` to support `build_stubbed` in tests, where the
  # value doesn't matter.
  #
  # NOTE: Wikis don't have a DB record, so this ID can be the same
  # for two wikis in different containers and should not be expected to
  # be unique. Use `to_global_id` instead if you need a unique ID.
  def id
    container.id
  end

  def path
    container.path + '.wiki'
  end

  # Returns the Gitlab::Git::Wiki object.
  def wiki
    strong_memoize(:wiki) do
      create_wiki_repository
      Gitlab::Git::Wiki.new(repository.raw)
    end
  end

  def create_wiki_repository
    repository.create_if_not_exists(default_branch)

    raise CouldNotCreateWikiError unless repository_exists?
  rescue StandardError => e
    Gitlab::ErrorTracking.track_exception(e, wiki: {
      container_type: container.class.name,
      container_id: container.id,
      full_path: full_path,
      disk_path: disk_path
    })

    raise CouldNotCreateWikiError
  end

  def has_home_page?
    !!find_page(HOMEPAGE)
  end

  def empty?
    !repository_exists? || list_pages(limit: 1).empty?
  end

  def exists?
    !empty?
  end

  # Lists wiki pages of the repository.
  #
  # limit - max number of pages returned by the method.
  # sort - criterion by which the pages are sorted.
  # direction - order of the sorted pages.
  # load_content - option, which specifies whether the content inside the page
  #                will be loaded.
  #
  # Returns an Array of GitLab WikiPage instances or an
  # empty Array if this Wiki has no pages.
  def list_pages(limit: 0, sort: nil, direction: DIRECTION_ASC, load_content: false)
    wiki.list_pages(
      limit: limit,
      sort: sort,
      direction_desc: direction == DIRECTION_DESC,
      load_content: load_content
    ).map do |page|
      WikiPage.new(self, page)
    end
  end

  def sidebar_entries(limit: Gitlab::WikiPages::MAX_SIDEBAR_PAGES, **options)
    pages = list_pages(**options.merge(limit: limit + 1))
    limited = pages.size > limit
    pages = pages.first(limit) if limited

    [WikiDirectory.group_pages(pages), limited]
  end

  # Finds a page within the repository based on a title
  # or slug.
  #
  # title - The human readable or parameterized title of
  #         the page.
  #
  # Returns an initialized WikiPage instance or nil
  def find_page(title, version = nil, load_content: true)
    page_title, page_dir = page_title_and_dir(title)

    if page = wiki.page(title: page_title, version: version, dir: page_dir, load_content: load_content)
      WikiPage.new(self, page)
    end
  end

  def find_sidebar(version = nil)
    find_page(SIDEBAR, version)
  end

  def find_file(name, version = 'HEAD', load_content: true)
    data_limit = load_content ? -1 : 0
    blobs = repository.blobs_at([[version, name]], blob_size_limit: data_limit)

    return if blobs.empty?

    Gitlab::Git::WikiFile.new(blobs.first)
  end

  def create_page(title, content, format = :markdown, message = nil)
    with_valid_format(format) do |default_extension|
      if file_exists_by_regex?(title)
        raise_duplicate_page_error!
      end

      capture_git_error(:created) do
        create_wiki_repository unless repository_exists?
        sanitized_path = sluggified_full_path(title, default_extension)
        repository.create_file(user, sanitized_path, content, **multi_commit_options(:created, message, title))
        repository.expire_status_cache if repository.empty?
        after_wiki_activity

        true
      rescue Gitlab::Git::Index::IndexError
        raise_duplicate_page_error!
      end
    end
  rescue Gitlab::Git::Wiki::DuplicatePageError => e
    @error_message = _("Duplicate page: %{error_message}" % { error_message: e.message })

    false
  end

  def update_page(page, content:, title: nil, format: :markdown, message: nil)
    with_valid_format(format) do |default_extension|
      title = title.presence || Pathname(page.path).sub_ext('').to_s

      # If the format is the same we keep the former extension. This check is for formats
      # that can have more than one extension like Markdown (.md, .markdown)
      # If we don't do this we will override the existing extension.
      extension = page.format != format.to_sym ? default_extension : File.extname(page.path).downcase[1..]

      capture_git_error(:updated) do
        repository.update_file(
          user,
          sluggified_full_path(title, extension),
          content,
          previous_path: page.path,
          **multi_commit_options(:updated, message, title))

        after_wiki_activity

        true
      end
    end
  end

  def delete_page(page, message = nil)
    return unless page

    capture_git_error(:deleted) do
      repository.delete_file(user, page.path, **multi_commit_options(:deleted, message, page.title))

      after_wiki_activity

      true
    end
  end

  def page_title_and_dir(title)
    return unless title

    title_array = title.split("/")
    title = title_array.pop
    [title, title_array.join("/")]
  end

  def ensure_repository
    raise CouldNotCreateWikiError unless wiki.repository_exists?
  end

  def hook_attrs
    {
      web_url: web_url,
      git_ssh_url: ssh_url_to_repo,
      git_http_url: http_url_to_repo,
      path_with_namespace: full_path,
      default_branch: default_branch
    }
  end

  override :repository
  def repository
    @repository ||= Gitlab::GlRepository::WIKI.repository_for(self)
  end

  def repository_storage
    raise NotImplementedError
  end

  def hashed_storage?
    raise NotImplementedError
  end

  override :full_path
  def full_path
    container.full_path + '.wiki'
  end

  # @deprecated use full_path when you need it for an URL route or disk_path when you want to point to the filesystem
  alias_method :path_with_namespace, :full_path

  override :default_branch
  def default_branch
    super || Gitlab::Git::Wiki.default_ref(container)
  end

  def wiki_base_path
    web_url(only_path: true).sub(%r{/#{Wiki::HOMEPAGE}\z}o, '')
  end

  # Callbacks for synchronous processing after wiki changes.
  # These will be executed after any change made through GitLab itself (web UI and API),
  # but not for Git pushes.
  def after_wiki_activity
  end

  # Callbacks for background processing after wiki changes.
  # These will be executed after any change to the wiki repository.
  def after_post_receive
  end

  override :git_garbage_collect_worker_klass
  def git_garbage_collect_worker_klass
    Wikis::GitGarbageCollectWorker
  end

  def cleanup
    @repository = nil
  end

  def capture_git_error(action, &block)
    yield block
  rescue Gitlab::Git::Index::IndexError,
         Gitlab::Git::CommitError,
         Gitlab::Git::PreReceiveError,
         Gitlab::Git::CommandError,
         ArgumentError => e

    Gitlab::ErrorTracking.log_exception(e, action: action, wiki_id: id)

    false
  end

  private

  def multi_commit_options(action, message = nil, title = nil)
    commit_message = build_commit_message(action, message, title)
    git_user = Gitlab::Git::User.from_gitlab(user)

    {
      branch_name: repository.root_ref || default_branch,
      message: commit_message,
      author_email: git_user.email,
      author_name: git_user.name
    }
  end

  def build_commit_message(action, message, title)
    message.presence || default_message(action, title)
  end

  def default_message(action, title)
    "#{user.username} #{action} page: #{title}"
  end

  def with_valid_format(format, &block)
    default_extension = Wiki::VALID_USER_MARKUPS.dig(format.to_sym, :default_extension).to_s

    if default_extension.blank?
      @error_message = _('Invalid format selected')

      return false
    end

    yield default_extension
  end

  def file_exists_by_regex?(title)
    return false unless repository_exists?

    escaped_title = Regexp.escape(sluggified_title(title))
    regex = Regexp.new("^#{escaped_title}\.#{ALLOWED_EXTENSIONS_REGEX}$", 'i')

    repository.ls_files('HEAD').any? { |s| s =~ regex }
  end

  def raise_duplicate_page_error!
    raise Gitlab::Git::Wiki::DuplicatePageError, _('A page with that title already exists')
  end

  def sluggified_full_path(title, extension)
    sluggified_title(title) + '.' + extension
  end

  def sluggified_title(title)
    utf8_encoded_title = Gitlab::EncodingHelper.encode_utf8_no_detect(title)

    sanitized_title(utf8_encoded_title).tr(' ', '-')
  end

  def sanitized_title(title)
    clean_absolute_path = File.expand_path(title, '/')

    Pathname.new(clean_absolute_path).relative_path_from('/').to_s
  end
end

Wiki.prepend_mod_with('Wiki')