Sha256: 3cca33fe910bafa6f30172f0e9602d72ee5fc7f3d9ee50a86ae9dd9662946c9d
Contents?: true
Size: 1.77 KB
Versions: 10
Compression:
Stored size: 1.77 KB
Contents
module Paperclip
class ContentTypeDetector
# The content-type detection strategy is as follows:
#
# 1. Blank/Empty files: If there's no filename or the file is empty,
# provide a sensible default (application/octet-stream or inode/x-empty)
#
# 2. Calculated match: Return the first result that is found by both the
# `file` command and MIME::Types.
#
# 3. Standard types: Return the first standard (without an x- prefix) entry
# in MIME::Types
#
# 4. Experimental types: If there were no standard types in MIME::Types
# list, try to return the first experimental one
#
# 5. Raw `file` command: Just use the output of the `file` command raw, or
# a sensible default. This is cached from Step 2.
EMPTY_TYPE = "inode/x-empty"
SENSIBLE_DEFAULT = "application/octet-stream"
def initialize(filename)
@filename = filename
end
# Returns a String describing the file's content type
def detect
if blank_name?
SENSIBLE_DEFAULT
elsif empty_file?
EMPTY_TYPE
elsif calculated_type_matches.any?
calculated_type_matches.first
else
type_from_file_command || SENSIBLE_DEFAULT
end.to_s
end
private
def empty_file?
File.exist?(@filename) && File.size(@filename) == 0
end
alias :empty? :empty_file?
def blank_name?
@filename.nil? || @filename.empty?
end
def possible_types
MIME::Types.type_for(@filename).collect(&:content_type)
end
def calculated_type_matches
possible_types.select{|content_type| content_type == type_from_file_command }
end
def type_from_file_command
@type_from_file_command ||= FileCommandContentTypeDetector.new(@filename).detect
end
end
end
Version data entries
10 entries across 8 versions & 2 rubygems