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# Module providing methods for dealing with separating a tree-ish string and a
# file path string when combined in a request parameter
module ExtractsPath
# Raised when given an invalid file path
InvalidPathError = Class.new(StandardError)
# 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 @project instance variable to contain the active project. This is
# used to check the input against a list of valid repository refs.
#
# Examples
#
# # No @project 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 = ['', '']
return pair unless @project
if id =~ /^(\h{40})(.+)/
# If the ref appears to be a SHA, we're done, just split the string
pair = $~.captures
else
# Otherwise, attempt to detect the ref using a list of the project's
# branches and tags
# Append a trailing slash if we only get a ref and no file path
id += '/' unless id.ends_with?('/')
valid_refs = ref_names.select { |v| id.start_with?("#{v}/") }
if valid_refs.length == 0
# No exact ref match, so just try our best
pair = id.match(/([^\/]+)(.*)/).captures
else
# There is a distinct possibility that multiple refs prefix the ID.
# Use the longest match to maximize the chance that we have the
# right ref.
best_match = valid_refs.max_by(&:length)
# Partition the string into the ref and the path, ignoring the empty first value
pair = id.partition(best_match)[1..-1]
end
end
# Remove ending slashes from path
pair[1].gsub!(/^\/|\/$/, '')
pair
end
# If we have an ID of 'foo.atom', and the controller provides Atom and HTML
# formats, then we have to check if the request was for the Atom version of
# the ID without the '.atom' suffix, or the HTML version of the ID including
# the suffix. We only check this if the version including the suffix doesn't
# match, so it is possible to create a branch which has an unroutable Atom
# feed.
def extract_ref_without_atom(id)
id_without_atom = id.sub(/\.atom$/, '')
valid_refs = ref_names.select { |v| "#{id_without_atom}/".start_with?("#{v}/") }
valid_refs.max_by(&:length)
end
# Assigns common instance variables for views working with Git tree-ish objects
#
# Assignments are:
#
# - @id - A string representing the joined ref and path
# - @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
#
# If the :id parameter appears to be requesting a specific response format,
# that will be handled as well.
#
# If there is no path and the ref doesn't exist in the repo, try to resolve
# the ref without an '.atom' suffix. If _that_ ref is found, set the request's
# format to Atom manually.
#
# Automatically renders `not_found!` if a valid tree path could not be
# resolved (e.g., when a user inserts an invalid path or ref).
def assign_ref_vars
# assign allowed options
allowed_options = ["filter_ref"]
@options = params.select {|key, value| allowed_options.include?(key) && !value.blank? }
@options = HashWithIndifferentAccess.new(@options)
@id = get_id
@ref, @path = extract_ref(@id)
@repo = @project.repository
@commit = @repo.commit(@ref)
if @path.empty? && !@commit && @id.ends_with?('.atom')
@id = @ref = extract_ref_without_atom(@id)
@commit = @repo.commit(@ref)
request.format = :atom if @commit
end
raise InvalidPathError unless @commit
@hex_path = Digest::SHA1.hexdigest(@path)
@logs_path = logs_file_namespace_project_ref_path(@project.namespace,
@project, @ref, @path)
rescue RuntimeError, NoMethodError, InvalidPathError
render_404
end
def tree
@tree ||= @repo.tree(@commit.id, @path)
end
private
# overriden in subclasses, do not remove
def get_id
id = params[:id] || params[:ref]
id += "/" + params[:path] unless params[:path].blank?
id
end
def ref_names
return [] unless @project
@ref_names ||= @project.repository.ref_names
end
end
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