检查字符串是否为base64 [英] check if string is base64

问题描述

我可能会收到以下两个字符串:

i may recieve these two strings:

    base = Base64.encode64(File.open("/home/usr/Desktop/test", "rb").read)
    => "YQo=\n"

    string = File.open("/home/usr/Desktop/test", "rb").read
    => "a\n"

到目前为止，我一直尝试用正则表达式i-e检查字符串. /([A-Za-z0-9+\/]{4})*([A-Za-z0-9+\/]{4}|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{2}==$)/，但是如果文件很大，这将非常繁琐.

what i have tried so far is to check string with regular expression i-e. /([A-Za-z0-9+\/]{4})*([A-Za-z0-9+\/]{4}|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{2}==$)/ but this would be very heavy if the file is big.

我也尝试过base.encoding.name和string.encoding.name，但是都返回相同的结果.

I also have tried base.encoding.name and string.encoding.name but both returns the same.

我还看到了这篇文章并得到了正则表达式解决方案，但还有其他解决方案吗?

I have also seen this post and got regular expression solution but any other solution ?

有什么主意吗?我只想得到的是字符串实际上是文本还是base64编码的文本....

Any idea ? I just want to get is the string is actually text or base64 encoded text....

推荐答案

您可以使用类似这样的方法，虽然性能不高，但是可以保证不会得到误报:

You can use something like this, not very performant but you are guaranteed not to get false positives:

require 'base64'

def base64?(value)
  value.is_a?(String) && Base64.encode64(Base64.decode64(value)) == value
end

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