summaryrefslogtreecommitdiff
path: root/app/models/blob.rb
blob: 954d4e4d779c95fec71d61248293032dad720b4a (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
# Blob is a Rails-specific wrapper around Gitlab::Git::Blob objects
class Blob < SimpleDelegator
  CACHE_TIME = 60 # Cache raw blobs referred to by a (mutable) ref for 1 minute
  CACHE_TIME_IMMUTABLE = 3600 # Cache blobs referred to by an immutable reference for 1 hour

  MAXIMUM_TEXT_HIGHLIGHT_SIZE = 1.megabyte

  # Finding a viewer for a blob happens based only on extension and whether the
  # blob is binary or text, which means 1 blob should only be matched by 1 viewer,
  # and the order of these viewers doesn't really matter.
  #
  # However, when the blob is an LFS pointer, we cannot know for sure whether the
  # file being pointed to is binary or text. In this case, we match only on
  # extension, preferring binary viewers over text ones if both exist, since the
  # large files referred to in "Large File Storage" are much more likely to be
  # binary than text.
  #
  # `.stl` files, for example, exist in both binary and text forms, and are
  # handled by different viewers (`BinarySTL` and `TextSTL`) depending on blob
  # type. LFS pointers to `.stl` files are assumed to always be the binary kind,
  # and use the `BinarySTL` viewer.
  RICH_VIEWERS = [
    BlobViewer::Markup,
    BlobViewer::Notebook,
    BlobViewer::SVG,

    BlobViewer::Image,
    BlobViewer::Sketch,
    BlobViewer::Balsamiq,

    BlobViewer::Video,

    BlobViewer::PDF,

    BlobViewer::BinarySTL,
    BlobViewer::TextSTL
  ].sort_by { |v| v.binary? ? 0 : 1 }.freeze

  AUXILIARY_VIEWERS = [
    BlobViewer::GitlabCiYml,
    BlobViewer::RouteMap,

    BlobViewer::Readme,
    BlobViewer::License,
    BlobViewer::Contributing,
    BlobViewer::Changelog,

    BlobViewer::Cartfile,
    BlobViewer::ComposerJson,
    BlobViewer::Gemfile,
    BlobViewer::Gemspec,
    BlobViewer::GodepsJson,
    BlobViewer::PackageJson,
    BlobViewer::Podfile,
    BlobViewer::Podspec,
    BlobViewer::PodspecJson,
    BlobViewer::RequirementsTxt,
    BlobViewer::YarnLock
  ].freeze

  attr_reader :project

  # Wrap a Gitlab::Git::Blob object, or return nil when given nil
  #
  # This method prevents the decorated object from evaluating to "truthy" when
  # given a nil value. For example:
  #
  #     blob = Blob.new(nil)
  #     puts "truthy" if blob # => "truthy"
  #
  #     blob = Blob.decorate(nil)
  #     puts "truthy" if blob # No output
  def self.decorate(blob, project = nil)
    return if blob.nil?

    new(blob, project)
  end

  def initialize(blob, project = nil)
    @project = project

    super(blob)
  end

  # Returns the data of the blob.
  #
  # If the blob is a text based blob the content is converted to UTF-8 and any
  # invalid byte sequences are replaced.
  def data
    if binary?
      super
    else
      @data ||= super.encode(Encoding::UTF_8, invalid: :replace, undef: :replace)
    end
  end

  def load_all_data!
    super(project.repository) if project
  end

  def no_highlighting?
    raw_size && raw_size > MAXIMUM_TEXT_HIGHLIGHT_SIZE
  end

  def empty?
    raw_size == 0
  end

  def external_storage_error?
    if external_storage == :lfs
      !project&.lfs_enabled?
    else
      false
    end
  end

  def stored_externally?
    return @stored_externally if defined?(@stored_externally)

    @stored_externally = external_storage && !external_storage_error?
  end

  # Returns the size of the file that this blob represents. If this blob is an
  # LFS pointer, this is the size of the file stored in LFS. Otherwise, this is
  # the size of the blob itself.
  def raw_size
    if stored_externally?
      external_size
    else
      size
    end
  end

  # Returns whether the file that this blob represents is binary. If this blob is
  # an LFS pointer, we assume the file stored in LFS is binary, unless a
  # text-based rich blob viewer matched on the file's extension. Otherwise, this
  # depends on the type of the blob itself.
  def raw_binary?
    if stored_externally?
      if rich_viewer
        rich_viewer.binary?
      elsif Linguist::Language.find_by_filename(name).any?
        false
      elsif _mime_type
        _mime_type.binary?
      else
        true
      end
    else
      binary?
    end
  end

  def extension
    @extension ||= extname.downcase.delete('.')
  end

  def file_type
    Gitlab::FileDetector.type_of(path)
  end

  def video?
    UploaderHelper::VIDEO_EXT.include?(extension)
  end

  def readable_text?
    text? && !stored_externally? && !truncated?
  end

  def simple_viewer
    @simple_viewer ||= simple_viewer_class.new(self)
  end

  def rich_viewer
    return @rich_viewer if defined?(@rich_viewer)

    @rich_viewer = rich_viewer_class&.new(self)
  end

  def auxiliary_viewer
    return @auxiliary_viewer if defined?(@auxiliary_viewer)

    @auxiliary_viewer = auxiliary_viewer_class&.new(self)
  end

  def rendered_as_text?(ignore_errors: true)
    simple_viewer.is_a?(BlobViewer::Text) && (ignore_errors || simple_viewer.render_error.nil?)
  end

  def show_viewer_switcher?
    rendered_as_text? && rich_viewer
  end

  def expanded?
    !!@expanded
  end

  def expand!
    @expanded = true
  end

  private

  def simple_viewer_class
    if empty?
      BlobViewer::Empty
    elsif raw_binary?
      BlobViewer::Download
    else # text
      BlobViewer::Text
    end
  end

  def rich_viewer_class
    viewer_class_from(RICH_VIEWERS)
  end

  def auxiliary_viewer_class
    viewer_class_from(AUXILIARY_VIEWERS)
  end

  def viewer_class_from(classes)
    return if empty? || external_storage_error?

    verify_binary = !stored_externally?

    classes.find { |viewer_class| viewer_class.can_render?(self, verify_binary: verify_binary) }
  end
end