使用python编写XML文件_Python_Xml_Saml

使用python编写XML文件

python xml

使用python编写XML文件,python,xml,saml,Python,Xml,Saml,我必须使用python标准模块（不使用elementtree、lxml等）编写一个xml文件。元数据是SAML身份提供程序元数据，其形式为- <?xml version="1.0"?> <EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:ds="http://www.w3.or

我必须使用python标准模块（不使用elementtree、lxml等）编写一个xml文件。元数据是SAML身份提供程序元数据，其形式为-

<?xml version="1.0"?>
<EntityDescriptor xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
    entityID="http://wsa.saas.com">
<IDPSSODescriptor>
<KeyDescriptor use="signing">
    <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
      <ds:X509Data><ds:X509Certificate>-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
</ds:X509Certificate></ds:X509Data>
    </ds:KeyInfo>
  </KeyDescriptor>

  <SingleSignOnService
    Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
    Location="http://idp5/singleSignOn" />
</IDPSSODescriptor>
</EntityDescriptor>


-----开始证书-----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-----结束证书-----

我现时的守则是这样做的—

>>> from xml.dom.minidom import Document
>>> doc = Document()
>>> entity_descriptor = doc.createElement("EntityDescriptor")
>>> doc.appendChild(entity_descriptor)
>>> entity_descriptor.setAttribute('xmlns', 'urn:oasis:names:tc:SAML:2.0:metadata')
>>> entity_descriptor.setAttribute('xmlns:saml', 'urn:oasis:names:tc:SAML:2.0:assertion')
>>> entity_descriptor.setAttribute('xmlns:ds', 'hxxp://xxx.w3.org/2000/09/xmldsig#')
>>> entity_descriptor.setAttribute('entityID', 'hxxp://wsa.saas.com')
>>> idpssodescr = doc.createElement('IDPSSODescriptor')
>>> entity_descriptor.appendChild(idpssodescr)
>>> keydescr = doc.createElement('KeyDescriptor')
>>> keydescr.setAttribute('use', 'signing')
>>> idpssodescr.appendChild(keydescr)
>>> keyinfo = doc.createElement('ds:KeyInfo')
>>> keyinfo.setAttribute('xmlns:ds', 'http://xxx.w3.org/2000/09/xmldsig#')
>>> keydescr.appendChild(keyinfo)
>>> x509data = doc.createElement('ds:X509Data')
>>> keyinfo.appendChild(x509data)
>>> x509cert = doc.createElement('ds:X509Certificate')
>>> ptext = doc.createTextNode("This is a test!")
>>> x509cert.appendChild(ptext)
>>> x509data.appendChild(x509cert)
>>> sso = doc.createElement('SingleSignOnService')
>>> sso.setAttribute('Binding', 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect')
>>> sso.setAttribute('Location', 'hxxx://idp5/singleSignOn')
>>> idpssodescr.appendChild(sso)
>>> print doc.toprettyxml(indent="  ")
<?xml version="1.0" ?>
<EntityDescriptor entityID="http://wsa.saas.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
  <IDPSSODescriptor>
    <KeyDescriptor use="signing">
      <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
        <ds:X509Data>
          <ds:X509Certificate>
            This is a test!
          </ds:X509Certificate>
        </ds:X509Data>
      </ds:KeyInfo>
    </KeyDescriptor>
    <SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://idp5/singleSignOn"/>
  </IDPSSODescriptor>
</EntityDescriptor>

>来自xml.dom.minidom导入文档
>>>doc=文件（）
>>>实体描述符=doc.createElement（“EntityDescriptor”）
>>>doc.appendChild（实体\描述符）
>>>entity_descriptor.setAttribute（'xmlns'，'urn:oasis:names:tc:SAML:2.0:metadata'）
>>>entity_descriptor.setAttribute（'xmlns:saml'，'urn:oasis:names:tc:saml:2.0:assertion'）
>>>实体\描述符.setAttribute（'xmlns:ds'，'hxxp://xxx.w3.org/2000/09/xmldsig#')
>>>实体\描述符.setAttribute（'entityID'，'hxxp://wsa.saas.com')
>>>idpssodescr=doc.createElement（'IDPSSODescriptor'）
>>>实体_描述符.appendChild（idpssodescr）
>>>keydescr=doc.createElement（'KeyDescriptor'）
>>>keydescr.setAttribute（'use'，'signing'）
>>>idpssodescr.appendChild（键描述）
>>>keyinfo=doc.createElement（'ds:keyinfo'）
>>>setAttribute（'xmlns:ds'，'http://xxx.w3.org/2000/09/xmldsig#')
>>>keydescr.appendChild（keyinfo）
>>>x509data=doc.createElement（'ds:x509data'）
>>>keyinfo.appendChild（x509data）
>>>x509cert=doc.createElement（'ds:X509Certificate'）
>>>ptext=doc.createTextNode（“这是一个测试！”）
>>>x509cert.appendChild（ptext）
>>>x509data.appendChild（x509cert）
>>>sso=doc.createElement（'SingleSignOnService'）
>>>setAttribute（'Binding'，'urn:oasis:names:tc:SAML:2.0:bindings:HTTP重定向'）
>>>sso.setAttribute（'Location'，'hxxx://idp5/singleSignOn')
>>>idpssodescr.appendChild（sso）
>>>打印doc.toprettyxml（indent=”“）
这是一个考验！

我对证书部分有点困惑。原件是

----开始证书---…

我的是：

 <ds:X509Certificate>
    This is the cert
 </ds:X509Certificate>


这是证书

对不起，我对XML没有太多经验。代码是否适合预期的任务

谢谢

怎么样？你的问题是什么？在这两行中：

>>> ptext = doc.createTextNode("This is a test!")
>>> x509cert.appendChild(ptext)

实际上，您正在创建一个文本节点作为节点的子节点 . 文本节点的内容是“这是一个测试！”。如果希望插入其他内容作为文本内容，则必须使用适当的参数调用.createTextNode

编辑（考虑OP的评论）：

不，它不是文本内容。在XML中，一切都是一个节点。您所认为的“标签之间的文本”实际上是一个文本节点。

只是为了存档，我以前的代码缺少一个小更改，这就是证书被拒绝的原因

from xml.dom.minidom import Document
doc = Document()
entity_descriptor = doc.createElement("EntityDescriptor")
doc.appendChild(entity_descriptor)
entity_descriptor.setAttribute('xmlns', 'urn:oasis:names:tc:SAML:2.0:metadata')
entity_descriptor.setAttribute('xmlns:saml', 'urn:oasis:names:tc:SAML:2.0:assertion')
entity_descriptor.setAttribute('xmlns:ds', 'http://www.w3.org/2000/09/xmldsig#')
entity_descriptor.setAttribute('entityID', 'http://wsa.saas.com')
idpssodescr = doc.createElement('IDPSSODescriptor')
idpssodescr.setAttribute('WantAuthnRequestsSigned', 'true')
idpssodescr.setAttribute('protocolSupportEnumeration',   
'urn:oasis:names:tc:SAML:2.0:protocol')
entity_descriptor.appendChild(idpssodescr)
keydescr = doc.createElement('KeyDescriptor')
keydescr.setAttribute('use', 'signing')
idpssodescr.appendChild(keydescr)
keyinfo = doc.createElement('ds:KeyInfo')
keyinfo.setAttribute('xmlns:ds', 'http://www.w3.org/2000/09/xmldsig#')
keydescr.appendChild(keyinfo)
x509data = doc.createElement('ds:X509Data')
keyinfo.appendChild(x509data)
x509cert = doc.createElement('ds:X509Certificate')

# Read the certificate from some file.
fp = file('idp.crt.pem', 'r')
s = ''
for i in fp.readlines():
    s+=''.join(i)


ptext = doc.createTextNode(s)
x509cert.appendChild(ptext)
x509data.appendChild(x509cert)
sso = doc.createElement('SingleSignOnService')
sso.setAttribute('Binding', 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect')
sso.setAttribute('Location', 'http://idp5/singleSignOn')
idpssodescr.appendChild(sso)

print doc.toprettyxml(indent="  ")
<?xml version="1.0" ?>
<EntityDescriptor entityID="http://wsa.saas.com"  
xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09  
/xmldsig#" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
<IDPSSODescriptor WantAuthnRequestsSigned="true"    
protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
<KeyDescriptor use="signing">
  <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    <ds:X509Data>
      <ds:X509Certificate>
        -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

      </ds:X509Certificate>
    </ds:X509Data>
  </ds:KeyInfo>
</KeyDescriptor>
<SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"   
Location="http://idp5/singleSignOn"/>
</IDPSSODescriptor>
</EntityDescriptor>

x = open('metadata.xml', 'w')
doc.writexml(x, "   ", "", "\n", "UTF-8")
x.close()

来自xml.dom.minidom导入文档
doc=文件（）
实体描述符=doc.createElement（“EntityDescriptor”）
doc.appendChild（实体\描述符）
entity_descriptor.setAttribute（'xmlns'，'urn:oasis:names:tc:SAML:2.0:metadata'）
entity_descriptor.setAttribute（'xmlns:saml'，'urn:oasis:names:tc:saml:2.0:assertion'）
实体\描述符.setAttribute（'xmlns:ds'，'http://www.w3.org/2000/09/xmldsig#')
实体\描述符.setAttribute（'entityID'，'http://wsa.saas.com')
idpssodescr=doc.createElement（'IDPSSODescriptor'）
idpssodescr.setAttribute（'WantuthnRequestsSigned'，'true'）
idpssodescr.setAttribute（'protocolSupportEnumeration'，
'urn:oasis:names:tc:SAML:2.0:protocol'）
实体_描述符.appendChild（idpssodescr）
keydescr=doc.createElement（'KeyDescriptor'）
keydescr.setAttribute（'use'，'signing'）
idpssodescr.appendChild（键描述）
keyinfo=doc.createElement（'ds:keyinfo'）
setAttribute（'xmlns:ds'，'http://www.w3.org/2000/09/xmldsig#')
keydescr.appendChild（keyinfo）
x509data=doc.createElement（'ds:x509data'）
keyinfo.appendChild（x509data）
x509cert=doc.createElement（'ds:X509Certificate'）
#从某个文件中读取证书。
fp=文件（'idp.crt.pem'，'r'）
s=“”
对于fp.readlines（）中的i：
s+=''。加入（i）
ptext=doc.createTextNode
x509cert.appendChild（ptext）
x509data.appendChild（x509cert）
sso=doc.createElement（'SingleSignOnService'）
setAttribute（'Binding'，'urn:oasis:names:tc:SAML:2.0:bindings:HTTP重定向'）
sso.setAttribute（'Location'，'http://idp5/singleSignOn')
idpssodescr.appendChild（sso）
打印doc.toprettyxml（indent=”“）
-----开始证书-----
MIICFTCCEAGAWIBAGIJAPEN4H3J3P2DMA0GCSQGSIB3DQEBBQUAMDQXCZAJBGNV
baytamfhmqswcqydvqkewjhytelmakga1ecxmcywexczajbgnvbamtamfhmb4x
DTA5MTAxOta4NTI1Owndelmakga1EBHMCYWEXCZAJ
BGNvBaoTamFHMQSWcqyDvqlEwjHytelmakGa1EAXmcyWgZ8WDQyJkozihVCN
AQEBBQADgY0AMIGJAoGBAMerInhZF/L0O0JMID8M1SSPHJFCT0PEIWQWQ+LZ8Ay
B6MCPNHFVMHQAGUT+6i+0NqKDppxnaVW4vOdYD64
from yattag import Doc, indent

doc, tag, text = Doc().tagtext()

doc.asis('<?xml version="1.0"?>')
with tag('EntityDescriptor',
        ("xmlns:saml", "urn:oasis:names:tc:SAML:2.0:assertion"), 
        ("xmlns:ds", "http://www.w3.org/2000/09/xmldsig#"),
        entityID = "http://wsa.saas.com",
        xmlns = "urn:oasis:names:tc:SAML:2.0:metadata"):
    with tag('IDPSSODescriptor'):
        with tag('KeyDescriptor', use='signing'):
            with tag('ds:KeyInfo', 
                    ("xmlns:ds", "http://www.w3.org/2000/09/xmldsig#")):
                with tag('ds:X509Data'):
                    with tag('ds:X509Certificate'):
                        text(
"""-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
""")
    with tag('SingleSignOnService',
        Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect",
        Location="http://idp5/singleSignOn"
    ):
        pass


result = indent(
    doc.getvalue(),
    indentation = ' '*4,
    newline = '\r\n'
)

print(result)

<?xml version="1.0"?>
<EntityDescriptor xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" entityID="http://wsa.saas.com" xmlns="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    <IDPSSODescriptor>
        <KeyDescriptor use="signing">
            <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
                <ds:X509Data>
                    <ds:X509Certificate>-----BEGIN CERTIFICATE-----
MIIDnjCCAoagAwIBAgIBATANBgkqhkiG9w0BAQUFADBUMQswCQYDVQQGEwJGUjEP
MA0GA1UECBMGRnJhbmNlMQ4wDAYDVQQHEwVQYXJpczETMBEGA1UEChMKRW50cm91
dmVydDEPMA0GA1UEAxMGRGFtaWVuMB4XDTA2MTAyNzA5MDc1NFoXDTExMTAyNjA5
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-----END CERTIFICATE-----
</ds:X509Certificate>
                </ds:X509Data>
            </ds:KeyInfo>
        </KeyDescriptor>
    </IDPSSODescriptor>
    <SingleSignOnService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://idp5/singleSignOn"></SingleSignOnService>
</EntityDescriptor>