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# frozen_string_literal: true
# Module providing methods for dealing with separating a tree-ish string and a
# file path string when combined in a request parameter
# Can be extended for different types of repository object, e.g. Project or Snippet
module ExtractsRef
class RefExtractor
InvalidPathError = Class.new(StandardError)
BRANCH_REF_TYPE = 'heads'
TAG_REF_TYPE = 'tags'
REF_TYPES = [BRANCH_REF_TYPE, TAG_REF_TYPE].freeze
attr_reader :repository_container, :params
attr_accessor :id, :ref, :commit, :path, :fully_qualified_ref
class << self
def ref_type(type)
return unless REF_TYPES.include?(type&.downcase)
type.downcase
end
def qualify_ref(ref, type)
validated_type = ref_type(type)
return ref unless validated_type
%(refs/#{validated_type}/#{ref})
end
def unqualify_ref(ref, type)
validated_type = ref_type(type)
return ref unless validated_type
ref.sub(%r{^refs/#{validated_type}/}, '')
end
end
def initialize(repository_container, params, override_id: nil)
@repository_container = repository_container
@params = params.extract!(:id, :ref, :path, :ref_type)
@override_id = override_id
end
# Extracts common variables for views working with Git tree-ish objects
#
# Assignments are:
#
# - @id - A string representing the joined ref and path
# Assigns @override_id if it is present.
# - @ref - A string representing the ref (e.g., the branch, tag, or commit SHA)
# - @path - A string representing the filesystem path
# - @commit - A Commit representing the commit from the given ref
# - @fully_qualified_ref - A string representing the fully qualifed ref (e.g., refs/tags/v1.1)
#
# If the :id parameter appears to be requesting a specific response format,
# that will be handled as well.
def extract!
qualified_id, @ref, @path = extract_ref_path
@id = @override_id || qualified_id
@repo = repository_container.repository
raise InvalidPathError if @ref.match?(/\s/)
return unless @ref.present?
@commit = if ref_type
@fully_qualified_ref = self.class.qualify_ref(@ref, ref_type)
@repo.commit(@fully_qualified_ref)
else
@repo.commit(@ref)
end
end
# Given a string containing both a Git tree-ish, such as a branch or tag, and
# a filesystem path joined by forward slashes, attempts to separate the two.
#
# Expects a repository_container method that returns the active repository object. This is
# used to check the input against a list of valid repository refs.
#
# Examples
#
# # No repository_container available
# extract_ref('master')
# # => ['', '']
#
# extract_ref('master')
# # => ['master', '']
#
# extract_ref("f4b14494ef6abf3d144c28e4af0c20143383e062/CHANGELOG")
# # => ['f4b14494ef6abf3d144c28e4af0c20143383e062', 'CHANGELOG']
#
# extract_ref("v2.0.0/README.md")
# # => ['v2.0.0', 'README.md']
#
# extract_ref('master/app/models/project.rb')
# # => ['master', 'app/models/project.rb']
#
# extract_ref('issues/1234/app/models/project.rb')
# # => ['issues/1234', 'app/models/project.rb']
#
# # Given an invalid branch, we fall back to just splitting on the first slash
# extract_ref('non/existent/branch/README.md')
# # => ['non', 'existent/branch/README.md']
#
# Returns an Array where the first value is the tree-ish and the second is the
# path
def extract_ref(id)
pair = extract_raw_ref(id)
[
pair[0].strip,
pair[1].delete_prefix('/').delete_suffix('/')
]
end
def extract_ref_path
id = extract_id_from_params
ref, path = extract_ref(id)
[id, ref, path]
end
def ref_type
self.class.ref_type(params[:ref_type])
end
private
def extract_raw_ref(id)
return ['', ''] unless repository_container
# If the ref appears to be a SHA, we're done, just split the string
return $~.captures if id =~ /^(\h{40})(.+)/
# No slash means we must have a ref and no path
return [id, ''] unless id.include?('/')
# Otherwise, attempt to detect the ref using a list of the
# repository_container's branches and tags
# Append a trailing slash if we only get a ref and no file path
id = [id, '/'].join unless id.ends_with?('/')
first_path_segment, rest = id.split('/', 2)
return [first_path_segment, rest] if use_first_path_segment?(first_path_segment)
valid_refs = ref_names.select { |v| id.start_with?("#{v}/") }
# No exact ref match, so just try our best
return id.match(%r{([^/]+)(.*)}).captures if valid_refs.empty?
# There is a distinct possibility that multiple refs prefix the ID.
# Use the longest match to maximize the chance that we have the
# right ref.
best_match = valid_refs.max_by(&:length)
# Partition the string into the ref and the path, ignoring the empty first value
id.partition(best_match)[1..]
end
def use_first_path_segment?(ref)
return false unless repository_container
return false if repository_container.repository.has_ambiguous_refs?
repository_container.repository.branch_names_include?(ref) ||
repository_container.repository.tag_names_include?(ref)
end
def extract_id_from_params
id = [params[:id] || params[:ref]]
id << ("/#{params[:path]}") unless params[:path].blank?
id.join
end
def ref_names
return [] unless repository_container
@ref_names ||= repository_container.repository.ref_names
end
end
end
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