The Base64 module provides for the encoding (encode64, strict_encode64, urlsafe_encode64) and decoding (decode64, strict_decode64, urlsafe_decode64) of binary data using a Base64 representation.
A simple encoding and decoding.
require "base64" enc = Base64.encode64('Send reinforcements') # -> "U2VuZCByZWluZm9yY2VtZW50cw==\n" plain = Base64.decode64(enc) # -> "Send reinforcements"
The purpose of using base64 to encode data is that it translates any binary data into purely printable characters.
Returns the Base64-decoded version of str. This method complies with RFC 2045. Characters outside the base alphabet are ignored.
require 'base64' str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' + 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' + 'ZSB0aHJlZQpBbmQgc28gb24uLi4K' puts Base64.decode64(str)
Generates:
This is line one This is line two This is line three And so on...
# File base64.rb, line 57
def decode64(str)
str.unpack("m").first
end
Returns the Base64-encoded version of bin. This method complies with RFC 2045. Line feeds are added to every 60 encoded charactors.
require 'base64' Base64.encode64("Now is the time for all good coders\nto learn Ruby")
Generates:
Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g UnVieQ==
# File base64.rb, line 37
def encode64(bin)
[bin].pack("m")
end
Returns the Base64-decoded version of str. This method complies with RFC 4648. ArgumentError is raised if str is incorrectly padded or contains non-alphabet characters. Note that CR or LF are also rejected.
# File base64.rb, line 72
def strict_decode64(str)
str.unpack("m0").first
end
Returns the Base64-encoded version of bin. This method complies with RFC 4648. No line feeds are added.
# File base64.rb, line 64
def strict_encode64(bin)
[bin].pack("m0")
end
Returns the Base64-decoded version of str. This method complies with “Base 64 Encoding with URL and Filename Safe Alphabet” in RFC 4648. The alphabet uses ‘-’ instead of ‘+’ and ‘_’ instead of ‘/’.
# File base64.rb, line 88
def urlsafe_decode64(str)
strict_decode64(str.tr("-_", "+/"))
end
Returns the Base64-encoded version of bin. This method complies with “Base 64 Encoding with URL and Filename Safe Alphabet” in RFC 4648. The alphabet uses ‘-’ instead of ‘+’ and ‘_’ instead of ‘/’.
# File base64.rb, line 80
def urlsafe_encode64(bin)
strict_encode64(bin).tr("+/", "-_")
end