Add base64Encode/base64Decode filter

[jcamiel]

Discussed in #1921

^{Originally posted by eydun September 12, 2023}
My login-request returns a token, which I am able to capture with jsonpath.

But before I can use this token for authorization in the second request, I need to base64 encode it. Is that possible?

Add base64Encode/base64Decode filter.

• base64Encode: input is in bytes, output is a string
• base64Decode: input is a string, output is bytes

GET https://foo.com/data.bin
HTTP 200
[Asserts]
bytes base64Encode == "SGVsbG8="
body == "Hello"

Note: to be more useful, we need to have also a filter going from bytes to string for instance utf8Encode/utf8Decode:

• utf8Encode: input is a string, output is in bytes
• utf8Decode: input is in bytes, output is a string

GET https://api.foo.com
HTTP 200
[Asserts]
jsonpath "$.data" base64Decode == hex,534756736247383d;
jsonpath "$.data" base64Decode utf8Decode == "Hello"
jsonpath "$.data" utf8Encode base64Encode == "SGVsbG8="

? Do we need a strEncode "encoding"/strDecode "encoding" filter with arbitrary encoding ? Like strEncode "gb-2317"