Clojure等同于python的base64编码和解码 [英] Clojure equivalent of python's base64 encode and decode

问题描述

我有这个python代码片段，需要帮助与clojure等效。

I have this python code snippet and need help with a clojure equivalent.

user_id = row.get('user_id')
if user_id:
    user_id_bytes = base64.urlsafe_b64decode(user_id)
    creation_timestamp = int.from_bytes(user_id_bytes[:4],
                                    byteorder='big')
    dc_id = int.from_bytes(user_id_bytes[4:5], byteorder='big') & 31
    if creation_timestamp > WHEN_WE_SET_UP_DC_IDS:
        row['dc_id'] = dc_id}

推荐答案

您可以使用clojure的java兼容性来利用 java.util.Base64 类。

You can use clojure's java compatibility to leverage the java.util.Base64 class.

user> (import java.util.Base64)
java.util.Base64

user> ;; encode a message
     (let [message "Hello World!"
           message-bytes (.getBytes message) 
           encoder (Base64/getUrlEncoder)]
       (.encodeToString encoder message-bytes)) 
"SGVsbG8gV29ybGQh"

user> ;; Decode a message
      (let [encoded-message "SGVsbG8gV29ybGQh"
            decoder (Base64/getUrlDecoder)]
        (String. (.decode decoder encoded-message)))
"Hello World!"

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