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# frozen_string_literal: true
# Encapsulates a string representing a filename to provide convenient access to parts of it and sanitization.
# A Filename instance is returned by ActiveStorage::Blob#filename, and is comparable so it can be used for sorting.
class ActiveStorage::Filename
include Comparable
def initialize(filename)
@filename = filename
end
# Returns the part of the filename preceding any extension.
#
# ActiveStorage::Filename.new("racecar.jpg").base # => "racecar"
# ActiveStorage::Filename.new("racecar").base # => "racecar"
# ActiveStorage::Filename.new(".gitignore").base # => ".gitignore"
def base
File.basename @filename, extension_with_delimiter
end
# Returns the extension of the filename (i.e. the substring following the last dot, excluding a dot at the
# beginning) with the dot that precedes it. If the filename has no extension, an empty string is returned.
#
# ActiveStorage::Filename.new("racecar.jpg").extension_with_delimiter # => ".jpg"
# ActiveStorage::Filename.new("racecar").extension_with_delimiter # => ""
# ActiveStorage::Filename.new(".gitignore").extension_with_delimiter # => ""
def extension_with_delimiter
File.extname @filename
end
# Returns the extension of the filename (i.e. the substring following the last dot, excluding a dot at
# the beginning). If the filename has no extension, an empty string is returned.
#
# ActiveStorage::Filename.new("racecar.jpg").extension_without_delimiter # => "jpg"
# ActiveStorage::Filename.new("racecar").extension_without_delimiter # => ""
# ActiveStorage::Filename.new(".gitignore").extension_without_delimiter # => ""
def extension_without_delimiter
extension_with_delimiter.from(1).to_s
end
alias_method :extension, :extension_without_delimiter
# Returns the sanitized filename.
#
# ActiveStorage::Filename.new("foo:bar.jpg").sanitized # => "foo-bar.jpg"
# ActiveStorage::Filename.new("foo/bar.jpg").sanitized # => "foo-bar.jpg"
#
# Characters considered unsafe for storage (e.g. \, $, and the RTL override character) are replaced with a dash.
def sanitized
@filename.encode(Encoding::UTF_8, invalid: :replace, undef: :replace, replace: "�").strip.tr("\u{202E}%$|:;/\t\r\n\\", "-")
end
def parameters #:nodoc:
Parameters.new self
end
# Returns the sanitized version of the filename.
def to_s
sanitized.to_s
end
def as_json(*)
to_s
end
def to_json
to_s
end
def <=>(other)
to_s.downcase <=> other.to_s.downcase
end
end
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