Question

我正在尝试使用本地dev_appserver在本地连接到BigQuery API，遵循本教程：https://developers.google.com/bigquery/authorization?hl=de#service-accounts 运行此站点上提到的代码，返回ImportError：

ImportError: cannot import name SignedJwtAssertionCredentials

所以我跟着错误发现了（在oauth2client / client.py中）：

if HAS_CRYPTO:
  # PyOpenSSL and PyCrypto are not prerequisites for oauth2client, so if it is
  # missing then don't create the SignedJwtAssertionCredentials or the
  # verify_id_token() method.

  class SignedJwtAssertionCredentials(AssertionCredentials):

但我需要“SignedJwtAssertionCredentials”！所以我进一步隔离了错误，发现（在oauth2client / crypt.py中）这一行实际上导致了这个问题：

from OpenSSL import crypto

我试过了：

$ python
>>> import OpenSSL
>>> OpenSSL.__file__
'/usr/local/lib/python2.7/site-packages/OpenSSL/__init__.pyc'
>>> from OpenSSL import crypto
>>> crypto.__file__
'/usr/local/lib/python2.7/site-packages/OpenSSL/crypto.so'

看起来很有前途，还检查了我的代码的sys.path：

['/Users/mattes/Developer/gae-projects/project123', 
 '/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine', 
 '/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine', 
 '/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7', 
 '/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2', 
'/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/protorpc-1.0', 
'/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webob-1.1.1', 
'/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/yaml-3.10']

无论如何，在"/usr/local/lib/python2.7/site-packages/OpenSSL"下添加/usr/local/lib/python2.7/site-packages/OpenSSL到sys.path和符号链接/Users/mattes/Developer/gae-projects/project123都不能解决这个问题。

/usr/local/lib/python2.7/site-packages/OpenSSL看起来像：

├── SSL.so
├── __init__.py
├── __init__.pyc
├── crypto.so
├── rand.so
├── test
│   ├── __init__.py
│   ├── __init__.pyc
│   ├── test_crypto.py
│   ├── test_crypto.pyc
│   ├── test_rand.py
│   ├── test_rand.pyc
│   ├── test_ssl.py
│   ├── test_ssl.pyc
│   ├── util.py
│   └── util.pyc
├── tsafe.py
├── tsafe.pyc
├── version.py
└── version.pyc

使用Mac 10.9 Mavericks，Python 2.7.5

有人可以帮忙吗？

Answer 1

为了在GAE服务器上运行，我发现需要三个步骤：

安装Google API Client（或至少oauth2client模块）的最新版本。请注意，它们提供了GAE目标下载。
将我的.p12密钥文件转换为.pem格式（使用openssl命令行工具）
```
openssl pkcs12  -nocerts -in cert.p12 -out cert.pem
```

将PyCrypto库添加到app.yaml。

libraries:
  - name: pycrypto
    version: "2.6"  # this could be "latest" if you are daring

对于dev_appserver，还必须在本地安装PyCrypto库，因为它不包含在SDK中。（API客户端库也支持OpenSSL，但我假设使用PyCrypto更接近运行时环境。）

Answer 2

通过在pycrypto libraries中向app.yaml部分添加libraries: - name: pycrypto version: "latest"来修复此问题：

{{1}}

没有名为OpenSSL.crypto和ImportError的模块：SignedJwtAssertionCredentials

2 个答案: