Ruby Base64 编码包括变量中的换行符

Question

base64 编码行 returns

试图了解如何通过 Base64 module 在 Base64 中附加行 returns，但我无法让编码执行我想要的操作...

简单地说，考虑到我的错误代码：

require "base64"
#
enc   = Base64.encode64(%q[
    #!/bin/bash
    echo 'this is a test of nesting quotes using ruby's %q thing-a-ma-bob'
    echo 'this should return a base64 formattes version of this "file" for the purposes of cloudconfig formation'
    echo "i'm not quite certain what this script should do... so for now it does a lot of nothing ... and i don't care"
    df -h |awk '{print "[ ]""{ }"" -- "}'
    ])
#
plain = Base64.decode64(enc)
#
#
puts "base64: "+enc
puts
puts "plain:"
puts plain
puts
puts "let's run the script now for testing:"
puts
exec({"code" => plain}, "echo ; echo bash ; echo $code")

returns:

base64: CiAgICAjIS9iaW4vYmFzaAogICAgZWNobyAndGhpcyBpcyBhIHRlc3Qgb2Yg
bmVzdGluZyBxdW90ZXMgdXNpbmcgcnVieSdzICVxIHRoaW5nLWEtbWEtYm9i
JwogICAgZWNobyAndGhpcyBzaG91bGQgcmV0dXJuIGEgYmFzZTY0IGZvcm1h
dHRlcyB2ZXJzaW9uIG9mIHRoaXMgImZpbGUiIGZvciB0aGUgcHVycG9zZXMg
b2YgY2xvdWRjb25maWcgZm9ybWF0aW9uJwogICAgZWNobyAiaSdtIG5vdCBx
dWl0ZSBjZXJ0YWluIHdoYXQgdGhpcyBzY3JpcHQgc2hvdWxkIGRvLi4uIHNv
IGZvciBub3cgaXQgZG9lcyBhIGxvdCBvZiBub3RoaW5nIC4uLiBhbmQgaSBk
b24ndCBjYXJlIgogICAgZGYgLWggfGF3ayAne3ByaW50ICQxIlsgXSIkMiJ7
IH0iJDMiIC0tICIkNH0nCiAgICA=

plain:

#!/bin/bash
echo 'this is a test of nesting quotes using ruby's %q thing-a-ma-bob'
echo 'this should return a base64 formattes version of this "file" for the purposes of cloudconfig formation'
echo "i'm not quite certain what this script should do... so for now it does a lot of nothing ... and i don't care"
df -h |awk '{print "[ ]""{ }"" -- "}'


let's run the script now for testing:


bash
#!/bin/bash echo 'this is a test of nesting quotes using ruby's %q thing-a-ma-bob' echo 'this should return a base64 formattes version of this "file" for the purposes of cloudconfig formation' echo "i'm not quite certain what this script should do... so for now it does a lot of nothing ... and i don't care" df -h |awk '{print "[ ]""{ }"" -- "}'

我想试着了解一下

如何将换行符带入我传递给系统命令的变量中，而不必采用如下格式：

plain = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +
    'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +
    'ZSB0aHJlZQpBbmQgc28gb24uLi4K'

谢谢

Answer 1

对负载进行编码时，您可能需要在通过 Base64 编码之前包含换行符。请看下面：

[7] pry(main)> require "base64"
=> true
[8] pry(main)> Base64.encode64("Apple\nBacon")
=> "QXBwbGUKQmFjb24=\n"
[9] pry(main)> Base64.decode64(_)
=> "Apple\nBacon"
[10] pry(main)> Base64.encode64("Apple\nBacon")
=> "QXBwbGUKQmFjb24=\n"
[11] pry(main)> puts Base64.decode64(_)
Apple
Bacon

在编码前将"\n"放在字符串中，解码时返回并打印出来

Answer 2

问题在于 echo 如何处理其输入，它与 base 64 编码/解码无关。

您对 exec 的呼叫有 echo $code。这里 $code 被扩展，然后在作为字符串列表传递给 echo 之前按空格拆分。 echo 然后打印出每一个以空格分隔。

为防止这种情况，您可以确保将整个 $code 变量作为单个字符串直接传递，方法是将其括在引号中。将 exec 行更改为（注意 $code 周围的额外引号）：

exec({"code" => plain}, "echo ; echo bash ; echo \"$code\"")

这将打印出包含换行符的块。

Ruby Base64 编码包括变量中的换行符

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base64 编码行 returns

returns:

我想试着了解一下

谢谢