Base64#urlsafe_decode64

urlsafe_decode64(str)

# File tmp/rubies/ruby-3.3.0/lib/base64.rb, line 351
def urlsafe_decode64(str)
  # NOTE: RFC 4648 does say nothing about unpadded input, but says that
  # "the excess pad characters MAY also be ignored", so it is inferred that
  # unpadded input is also acceptable.
  if !str.end_with?("=") && str.length % 4 != 0
    str = str.ljust((str.length + 3) & ~3, "=")
    str.tr!("-_", "+/")
  else
    str = str.tr("-_", "+/")
  end
  strict_decode64(str)
end

Returns the decoding of an RFC-4648-compliant Base64-encoded string str:

str may not contain non-Base64 characters; see Encoding Character Set above:

Example

Base64.urlsafe_decode64('+')  # Raises ArgumentError.
Base64.urlsafe_decode64('/')  # Raises ArgumentError.
Base64.urlsafe_decode64("\n") # Raises ArgumentError.

Padding in str, if present, must be correct: see Padding, above:

Example

Base64.urlsafe_decode64("MDEyMzQ1Njc") # => "01234567"
Base64.urlsafe_decode64("MDEyMzQ1Njc=") # => "01234567"
Base64.urlsafe_decode64("MDEyMzQ1Njc==") # Raises ArgumentError.

See also #strict_encode64 #urlsafe_encode64 #strict_decode64 also in 3.2 · 3.1 · 3.0

‹ prev#strict_encode64 next ›#urlsafe_encode64