小编Dav*_*ith的帖子

我正在尝试理解RelativeSource绑定,但我找不到TemplatedParent的定义. MSDN说:

"获取一个静态值,用于返回为TemplatedParent模式构造的RelativeSource."

它没有出现在"Windows Presentation Foundation Unleashed"的索引中.

简单来说,什么是TemplatedParent呢？

在这段代码中,语句(fix_imports)和(app)的目的是什么？

这是整个文件:

from ferris import fix_imports
(fix_imports)

# Import the application
from ferris.core import settings
settings.load_settings()

import ferris
import ferris.app
import ferris.deferred_app
import ferris.routes
import app.routes
import app.listeners
(app)

main_app = ferris.app.app  # Main application
deferred_app = ferris.deferred_app.app  # Deferred application

appstats_settings = settings.get('appstats', {})

if (appstats_settings.get('enabled', False) and ferris.app.debug) or appstats_settings.get('enabled_live', True):
    from google.appengine.ext.appstats import recording
    main_app = recording.appstats_wsgi_middleware(main_app)

我正在 Go 中使用 Google Cloud，并关注 John Hanley 的这篇文章：

https://www.jhanley.com/google-cloud-improving-security-with-impersonation/

并把它与这个SO答案混在一起：

如何从 Google Compute Engine 和本地验证 Google API（Google Drive API），而无需下载服务帐户凭据？

凭据已成功保存到“application_default_credentials.json”：

注意：“type”：“ impersonated_service_account ”

    {
  "delegates": [],
  "service_account_impersonation_url": "https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/[sa@example-2021.iam.gserviceaccount.com]:generateAccessToken",
  "source_credentials": {
    "client_id": "...apps.googleusercontent.com",
    "client_secret": "...",
    "refresh_token": "...",
    "type": "authorized_user"
  },
  "type": "impersonated_service_account"
}

我的代码产生未知的凭据类型：“impersonated_service_account”错误：

package main

import (
...
    "cloud.google.com/go/storage"
    "golang.org/x/oauth2"
    "google.golang.org/api/docs/v1"
    "google.golang.org/api/drive/v3"
    "google.golang.org/api/impersonate"
    "google.golang.org/api/option"
...
)

var Config.GoogleServiceAccount string = "sa@example-2021.iam.gserviceaccount.com"




func main(){
  _ = getTokenAsImpersonator()
}

// From: https://pkg.go.dev/google.golang.org/api/impersonate#example-CredentialsTokenSource-ServiceAccount
func getTokenAsImpersonator() oauth2.TokenSource {
    ctx := context.Background()

    // …