# frozen_string_literal: true

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#

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# = base64.rb: methods for base64-encoding and -decoding strings

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#

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# The Base64 module provides for the encoding (#encode64, #strict_encode64,

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# #urlsafe_encode64) and decoding (#decode64, #strict_decode64,

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# #urlsafe_decode64) of binary data using a Base64 representation.

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#

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# == Example

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#

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# A simple encoding and decoding.

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#

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# require "base64"

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#

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# enc = Base64.encode64('Send reinforcements')

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# # -> "U2VuZCByZWluZm9yY2VtZW50cw==\n"

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# plain = Base64.decode64(enc)

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# # -> "Send reinforcements"

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#

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# The purpose of using base64 to encode data is that it translates any

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# binary data into purely printable characters.

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module Base64

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module_function

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# Returns the Base64-encoded version of +bin+.

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# This method complies with RFC 2045.

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# Line feeds are added to every 60 encoded characters.

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#

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# require 'base64'

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# Base64.encode64("Now is the time for all good coders\nto learn Ruby")

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#

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# <i>Generates:</i>

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#

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# Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g

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# UnVieQ==

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def encode64(bin)

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[bin].pack("m")

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end

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# Returns the Base64-decoded version of +str+.

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# This method complies with RFC 2045.

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# Characters outside the base alphabet are ignored.

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#

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# require 'base64'

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# str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +

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# 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +

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# 'ZSB0aHJlZQpBbmQgc28gb24uLi4K'

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# puts Base64.decode64(str)

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#

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# <i>Generates:</i>

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#

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# This is line one

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# This is line two

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# This is line three

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# And so on...

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def decode64(str)

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str.unpack1("m")

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end

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# Returns the Base64-encoded version of +bin+.

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# This method complies with RFC 4648.

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# No line feeds are added.

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def strict_encode64(bin)

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[bin].pack("m0")

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end

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# Returns the Base64-decoded version of +str+.

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# This method complies with RFC 4648.

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# ArgumentError is raised if +str+ is incorrectly padded or contains

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# non-alphabet characters. Note that CR or LF are also rejected.

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def strict_decode64(str)

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str.unpack1("m0")

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end

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# Returns the Base64-encoded version of +bin+.

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# This method complies with ``Base 64 Encoding with URL and Filename Safe

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# Alphabet'' in RFC 4648.

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# The alphabet uses '-' instead of '+' and '_' instead of '/'.

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# Note that the result can still contain '='.

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# You can remove the padding by setting +padding+ as false.

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def urlsafe_encode64(bin, padding: true)

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str = strict_encode64(bin)

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str.chomp!("==") or str.chomp!("=") unless padding

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str.tr!("+/", "-_")

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str

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end

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# Returns the Base64-decoded version of +str+.

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# This method complies with ``Base 64 Encoding with URL and Filename Safe

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# Alphabet'' in RFC 4648.

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# The alphabet uses '-' instead of '+' and '_' instead of '/'.

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#

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# The padding character is optional.

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# This method accepts both correctly-padded and unpadded input.

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# Note that it still rejects incorrectly-padded input.

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def urlsafe_decode64(str)

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# NOTE: RFC 4648 does say nothing about unpadded input, but says that

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# "the excess pad characters MAY also be ignored", so it is inferred that

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# unpadded input is also acceptable.

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if !str.end_with?("=") && str.length % 4 != 0

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str = str.ljust((str.length + 3) & ~3, "=")

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str.tr!("-_", "+/")

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else

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str = str.tr("-_", "+/")

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end

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strict_decode64(str)

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end

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end

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