125 lines
4.1 KiB
Ruby
125 lines
4.1 KiB
Ruby
# Module providing methods for dealing with separating a tree-ish string and a
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# file path string when combined in a request parameter
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module ExtractsPath
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extend ActiveSupport::Concern
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# Raised when given an invalid file path
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class InvalidPathError < StandardError; end
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included do
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if respond_to?(:before_filter)
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before_filter :assign_ref_vars, only: [:show]
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end
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end
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# Given a string containing both a Git tree-ish, such as a branch or tag, and
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# a filesystem path joined by forward slashes, attempts to separate the two.
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#
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# Expects a @project instance variable to contain the active project. This is
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# used to check the input against a list of valid repository refs.
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#
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# Examples
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#
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# # No @project available
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# extract_ref('master')
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# # => ['', '']
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#
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# extract_ref('master')
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# # => ['master', '']
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#
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# extract_ref("f4b14494ef6abf3d144c28e4af0c20143383e062/CHANGELOG")
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# # => ['f4b14494ef6abf3d144c28e4af0c20143383e062', 'CHANGELOG']
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#
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# extract_ref("v2.0.0/README.md")
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# # => ['v2.0.0', 'README.md']
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#
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# extract_ref('/gitlab/vagrant/tree/master/app/models/project.rb')
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# # => ['master', 'app/models/project.rb']
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#
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# extract_ref('issues/1234/app/models/project.rb')
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# # => ['issues/1234', 'app/models/project.rb']
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#
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# # Given an invalid branch, we fall back to just splitting on the first slash
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# extract_ref('non/existent/branch/README.md')
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# # => ['non', 'existent/branch/README.md']
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#
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# Returns an Array where the first value is the tree-ish and the second is the
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# path
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def extract_ref(input)
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pair = ['', '']
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return pair unless @project
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# Remove project, actions and all other staff from path
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input.gsub!("/#{@project.path_with_namespace}", "")
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input.gsub!(/^\/(tree|commits|blame|blob)\//, "") # remove actions
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input.gsub!(/\?.*$/, "") # remove stamps suffix
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input.gsub!(/.atom$/, "") # remove rss feed
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input.gsub!(/\/edit$/, "") # remove edit route part
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if input.match(/^([[:alnum:]]{40})(.+)/)
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# If the ref appears to be a SHA, we're done, just split the string
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pair = $~.captures
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else
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# Otherwise, attempt to detect the ref using a list of the project's
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# branches and tags
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# Append a trailing slash if we only get a ref and no file path
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id = input
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id += '/' unless id.ends_with?('/')
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valid_refs = @project.ref_names
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valid_refs.select! { |v| id.start_with?("#{v}/") }
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if valid_refs.length != 1
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# No exact ref match, so just try our best
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pair = id.match(/([^\/]+)(.*)/).captures
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else
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# Partition the string into the ref and the path, ignoring the empty first value
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pair = id.partition(valid_refs.first)[1..-1]
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end
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end
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# Remove ending slashes from path
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pair[1].gsub!(/^\/|\/$/, '')
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pair
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end
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# Assigns common instance variables for views working with Git tree-ish objects
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#
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# Assignments are:
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#
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# - @id - A string representing the joined ref and path
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# - @ref - A string representing the ref (e.g., the branch, tag, or commit SHA)
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# - @path - A string representing the filesystem path
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# - @commit - A CommitDecorator representing the commit from the given ref
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# - @tree - A TreeDecorator representing the tree at the given ref/path
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#
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# If the :id parameter appears to be requesting a specific response format,
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# that will be handled as well.
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#
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# Automatically renders `not_found!` if a valid tree path could not be
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# resolved (e.g., when a user inserts an invalid path or ref).
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def assign_ref_vars
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# Handle formats embedded in the id
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if params[:id].ends_with?('.atom')
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params[:id].gsub!(/\.atom$/, '')
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request.format = :atom
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end
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@ref, @path = extract_ref(request.fullpath)
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@id = File.join(@ref, @path)
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@commit = CommitDecorator.decorate(@project.commit(@ref))
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@tree = Tree.new(@commit.tree, @project, @ref, @path)
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@tree = TreeDecorator.new(@tree)
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raise InvalidPathError if @tree.invalid?
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rescue NoMethodError, InvalidPathError
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not_found!
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end
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end
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