CODEWITHSUNDEEP
rubybase64
Kamilski81
Kamilski81

Reputation: 15107

How do I use Base64 and exclude special characters +/= from string?

I am currently using Ruby's 'base64' but the strings that are created have special characters like /+= .

How do I remove these and still make sure that my decode works in the future?

Essentially I want alphanumeric to be used.

Upvotes: 1

Views: 9364

Answers (3)

Frederick Cheung
Frederick Cheung

Reputation: 84114

Rather than invent something new, I'd use Base64.urlsafe_encode64 (and its counterpart Base64.urlsafe_decode64) which is basically base64 with + and / replaced with - and _. This conforms to rfc 4648 so should be widely understandable

Upvotes: 5

steenslag
steenslag

Reputation: 80065

class Integer
  Base62_digits = [*("0".."9"), *("a".."z"), *("A".."Z")]

  def base_62
    return "0" if zero?
    sign = self < 0 ? "-" : ""
    n, res = self.abs, ""
    while n > 0
      n, units = n.divmod(62)
      res = Base62_digits[units] + res
    end
    sign + res
  end

end

p 124.base_62 # => "20"

This could be adapted to handle lower bases, but it may be sufficient as is.

Upvotes: 0

sawa
sawa

Reputation: 168071

If you want alphanumeric, I think it is better and is practical to use base 36. Ruby has built-in encoding/decoding up to base 36 (26 letters and 10 numbers).

123456.to_s(36)
# => "qglj"

"qglj".to_i(36)
# => 123456

Upvotes: 2

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