将字符串转换为 Web 安全的 Base64 格式 [英] Converting string to web-safe Base64 format

问题描述

我正在测试如何使用带有 Google Apps 脚本的 Admin SDK Directory Service 更新用户图片，并具有以下功能:

I am testing how to update user picture using the Admin SDK Directory Service with Google Apps Scripts with the following function:

function updatePhoto(){
  var fileId = 'XXXXXXXXXXXXXXXXXXX';
  var b = DocsList.getFileById(fileId).getBlob();
  var encoded = Utilities.base64Encode(b.getBytes());

  encoded = encoded.replace(///g,'_').replace(/+/g,'-').replace(/=/g,'*');
  AdminDirectory.Users.Photos.update({
    "photoData": encoded },'[e-mail]');
}

然而，它并不总是有效.每当 base64 编码字符串中有填充时，它就会失败.参考 Google 的文档(https://developers.google.com/admin-sdk/directory/v1/reference/users/photos/update)，我对这些描述有点困惑.它说:

However, it doesn't always work. Whenever there is padding in the base64 encoded string, it fails. Referring to Google's document (https://developers.google.com/admin-sdk/directory/v1/reference/users/photos/update), I am a bit confused with the descriptions. It says:

1. 等号 (=) 字符被替换为星号 (*).
2. 对于填充，使用句点 (.) 字符代替RFC-4648 baseURL 定义，它使用等号 (=)填充.这样做是为了简化 URL 解析.

实际应该怎么做?(=) 用于 Base64 中的填充.那么，我应该使用 (*) 还是 (.)?我确实尝试用 (.) 替换 (=) 但没有运气.

What should be actually done? (=) is used for padding in Base64. So, should I use (*) or (.)? I did try to replace (=) with (.) but no luck.

有人可以帮忙吗?

太奇怪了.当我不替换 (=) 时它有效.

It is so strange. It works when i do not replace (=).

function updatePhoto(){
  var fileId = 'XXXXXXXXXXXXXXXXXXX';
  var b = DocsList.getFileById(fileId).getBlob();
  var encoded = Utilities.base64Encode(b.getBytes());

  encoded = encoded.replace(///g,'_').replace(/+/g,'-');
  AdminDirectory.Users.Photos.update({
    "photoData": encoded },'[e-mail]');

}

推荐答案

API 要求您使用 URL 安全的 base64 编码.完成base64编码后，尝试将/替换为_，将+替换为-.详情见:

The API requires you to use URL-safe base64 encoding. After doing the base64 encoding, try replacing / with _ and + with -. Details at:

https://developers.google.com/admin-sdk/directory/v1/reference/users/photos/update

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