112 lines
3.6 KiB
Ruby
112 lines
3.6 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
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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('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(id)
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pair = ['', '']
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return pair unless @project
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if id.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 = $~.captures
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else
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# Otherwise, attempt to detect the ref using a list of the project's
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# branches and tags
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# Append a trailing slash if we only get a ref and no file path
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id += '/' unless id.ends_with?('/')
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valid_refs = @project.repository.ref_names
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valid_refs.select! { |v| id.start_with?("#{v}/") }
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if valid_refs.length != 1
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# No exact ref match, so just try our best
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pair = id.match(/([^\/]+)(.*)/).captures
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else
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# Partition the string into the ref and the path, ignoring the empty first value
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pair = id.partition(valid_refs.first)[1..-1]
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end
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end
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# Remove ending slashes from path
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pair[1].gsub!(/^\/|\/$/, '')
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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 Commit representing the commit from the given ref
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# - @tree - A Tree 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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@id = params[:id]
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@ref, @path = extract_ref(@id)
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# It is used "@project.repository.commits(@ref, @path, 1, 0)",
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# because "@project.repository.commit(@ref)" returns wrong commit when @ref is tag name.
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@commit = @project.repository.commits(@ref, @path, 1, 0).first
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@tree = Tree.new(@commit.tree, @ref, @path)
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raise InvalidPathError if @tree.invalid?
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rescue RuntimeError, NoMethodError, InvalidPathError
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not_found!
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end
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end
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