gitlab-org--gitlab-foss/app/models/blob.rb

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# frozen_string_literal: true
# Blob is a Rails-specific wrapper around Gitlab::Git::Blob, SnippetBlob and Ci::ArtifactBlob
class Blob < SimpleDelegator
include GlobalID::Identification
include Presentable
include BlobLanguageFromGitAttributes
include BlobActiveModel
MODE_SYMLINK = '120000' # The STRING 120000 is the git-reported octal filemode for a symlink
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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
# 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.
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RICH_VIEWERS = [
BlobViewer::CSV,
BlobViewer::Markup,
BlobViewer::Notebook,
BlobViewer::SVG,
BlobViewer::OpenApi,
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BlobViewer::Image,
BlobViewer::Sketch,
BlobViewer::Balsamiq,
BlobViewer::Video,
BlobViewer::Audio,
BlobViewer::PDF,
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BlobViewer::BinarySTL,
BlobViewer::TextSTL
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].sort_by { |v| v.binary? ? 0 : 1 }.freeze
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AUXILIARY_VIEWERS = [
BlobViewer::GitlabCiYml,
BlobViewer::RouteMap,
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BlobViewer::Readme,
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BlobViewer::License,
BlobViewer::Contributing,
BlobViewer::Changelog,
BlobViewer::MetricsDashboardYml,
BlobViewer::CargoToml,
BlobViewer::Cartfile,
BlobViewer::ComposerJson,
BlobViewer::Gemfile,
BlobViewer::Gemspec,
BlobViewer::GodepsJson,
BlobViewer::GoMod,
BlobViewer::PackageJson,
BlobViewer::Podfile,
BlobViewer::Podspec,
BlobViewer::PodspecJson,
BlobViewer::RequirementsTxt,
BlobViewer::YarnLock
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].freeze
attr_reader :container
delegate :repository, to: :container, allow_nil: true
delegate :project, to: :repository, allow_nil: true
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# 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, container = nil)
return if blob.nil?
new(blob, container)
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end
def self.lazy(repository, commit_id, path, blob_size_limit: Gitlab::Git::Blob::MAX_DATA_DISPLAY_SIZE)
BatchLoader.for([commit_id, path]).batch(key: repository) do |items, loader, args|
args[:key].blobs_at(items, blob_size_limit: blob_size_limit).each do |blob|
loader.call([blob.commit_id, blob.path], blob) if blob
end
end
end
def initialize(blob, container = nil)
@container = container
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super(blob)
end
def inspect
"#<#{self.class.name} oid:#{id[0..8]} commit:#{commit_id[0..8]} path:#{path}>"
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_in_repo?
super
else
@data ||= super.encode(Encoding::UTF_8, invalid: :replace, undef: :replace)
end
end
def load_all_data!
# Endpoint needed: https://gitlab.com/gitlab-org/gitaly/issues/756
Gitlab::GitalyClient.allow_n_plus_1_calls do
super(repository) if container
end
end
def empty?
raw_size == 0
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end
def external_storage_error?
if external_storage == :lfs
!repository.lfs_enabled?
else
false
end
end
def stored_externally?
return @stored_externally if defined?(@stored_externally)
@stored_externally = external_storage && !external_storage_error?
end
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# 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.
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def raw_size
if stored_externally?
external_size
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else
size
end
end
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# 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 binary?
if stored_externally?
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if rich_viewer
rich_viewer.binary?
elsif known_extension?
false
elsif _mime_type
_mime_type.binary?
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else
true
end
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else
binary_in_repo?
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end
end
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def extension
@extension ||= extname.downcase.delete('.')
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end
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def file_type
name = File.basename(path)
Gitlab::FileDetector.type_of(path) || Gitlab::FileDetector.type_of(name)
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end
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def video?
UploaderHelper::SAFE_VIDEO_EXT.include?(extension)
end
def audio?
UploaderHelper::SAFE_AUDIO_EXT.include?(extension)
end
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def readable_text?
text_in_repo? && !stored_externally? && !truncated?
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end
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def simple_viewer
@simple_viewer ||= simple_viewer_class.new(self)
end
def rich_viewer
return @rich_viewer if defined?(@rich_viewer)
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@rich_viewer = rich_viewer_class&.new(self)
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end
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def auxiliary_viewer
return @auxiliary_viewer if defined?(@auxiliary_viewer)
@auxiliary_viewer = auxiliary_viewer_class&.new(self)
end
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def rendered_as_text?(ignore_errors: true)
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simple_viewer.is_a?(BlobViewer::Text) && (ignore_errors || simple_viewer.render_error.nil?)
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end
def show_viewer_switcher?
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rendered_as_text? && rich_viewer
end
def expanded?
!!@expanded
end
def expand!
@expanded = true
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end
private
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def simple_viewer_class
if empty?
BlobViewer::Empty
elsif binary?
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BlobViewer::Download
else # text
BlobViewer::Text
end
end
def rich_viewer_class
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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?
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verify_binary = !stored_externally?
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classes.find { |viewer_class| viewer_class.can_render?(self, verify_binary: verify_binary) }
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end
end