(Go) Create AuthNRequest with embedded signature (HTTP-POST binding)

Demonstrates how to create a SAML AuthNRequest with embedded signature (HTTP-POST binding).

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example will sign the following SAML AuthNRequest:

    // <samlp:AuthnRequest 
    //      xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
    //      xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    //      ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3"
    //      Version="2.0" ProviderName="SP test" IssueInstant="2014-07-16T23:52:45Z"
    //      Destination="http://idp.example.com/SSOService.php"
    //      ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
    //      AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
    //   <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
    //   <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
    //   <samlp:RequestedAuthnContext Comparison="exact">
    //     <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
    //   </samlp:RequestedAuthnContext>
    // </samlp:AuthnRequest>

    // First we build the XML to be signed.
    // 
    // Use this online tool to generate the code from sample XML: 
    // Generate Code to Create XML

    success := true
    xmlToSign := chilkat.NewXml()
    xmlToSign.SetTag("samlp:AuthnRequest")
    xmlToSign.AddAttribute("xmlns:samlp","urn:oasis:names:tc:SAML:2.0:protocol")
    xmlToSign.AddAttribute("xmlns:saml","urn:oasis:names:tc:SAML:2.0:assertion")
    xmlToSign.AddAttribute("ID","pfx41d8ef22-e612-8c50-9960-1b16f15741b3")
    xmlToSign.AddAttribute("Version","2.0")
    xmlToSign.AddAttribute("ProviderName","SP test")
    xmlToSign.AddAttribute("IssueInstant","2014-07-16T23:52:45Z")
    xmlToSign.AddAttribute("Destination","http://idp.example.com/SSOService.php")
    xmlToSign.AddAttribute("ProtocolBinding","urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST")
    xmlToSign.AddAttribute("AssertionConsumerServiceURL","http://sp.example.com/demo1/index.php?acs")
    xmlToSign.UpdateChildContent("saml:Issuer","http://sp.example.com/demo1/metadata.php")
    xmlToSign.UpdateAttrAt("samlp:NameIDPolicy",true,"Format","urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress")
    xmlToSign.UpdateAttrAt("samlp:NameIDPolicy",true,"AllowCreate","true")
    xmlToSign.UpdateAttrAt("samlp:RequestedAuthnContext",true,"Comparison","exact")
    xmlToSign.UpdateChildContent("samlp:RequestedAuthnContext|saml:AuthnContextClassRef","urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport")

    // Also see the online tool to generate the code from sample already-signed XML: 
    // Generate XML Signature Creation Code from an Already-Signed XML Sample

    gen := chilkat.NewXmlDSigGen()

    gen.SetSigLocation("samlp:AuthnRequest")
    gen.SetSigNamespacePrefix("ds")
    gen.SetSigNamespaceUri("http://www.w3.org/2000/09/xmldsig#")
    gen.SetSignedInfoCanonAlg("EXCL_C14N")
    gen.SetSignedInfoDigestMethod("sha1")

    // -------- Reference 1 --------
    gen.AddSameDocRef("pfx41d8ef22-e612-8c50-9960-1b16f15741b3","sha1","EXCL_C14N","","")

    // Provide a certificate + private key. (PFX password is test123)
    cert := chilkat.NewCert()
    success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
    if success != true {
        fmt.Println(cert.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        cert.DisposeCert()
        return
    }

    gen.SetX509Cert(cert,true)

    gen.SetKeyInfoType("X509Data")
    gen.SetX509Type("Certificate")

    // Load XML to be signed...
    sbXml := chilkat.NewStringBuilder()
    xmlToSign.GetXmlSb(sbXml)

    gen.SetBehaviors("IndentedSignature,ForceAddEnvelopedSignatureTransform")

    // Sign the XML...
    success = gen.CreateXmlDSigSb(sbXml)
    if success != true {
        fmt.Println(gen.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        return
    }

    // Save the signed XMl to a file.
    success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",false)

    // A sample of the signed XML is shown below..
    fmt.Println(*sbXml.GetAsString())

    // ----------------------------------------
    // Verify the signature we just produced...
    verifier := chilkat.NewXmlDSig()
    success = verifier.LoadSignatureSb(sbXml)
    if success != true {
        fmt.Println(verifier.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        verifier.DisposeXmlDSig()
        return
    }

    verified := verifier.VerifySignature(true)
    if verified != true {
        fmt.Println(verifier.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        verifier.DisposeXmlDSig()
        return
    }

    fmt.Println("This signature was successfully verified.")

    // -----------------------------------------
    // Sample output of AuthNRequest signed XML:
    // (Line-breaks and some indenting added for readability..)

    // <?xml version="1.0" encoding="utf-8"?>
    // <samlp:AuthnRequest 
    //   xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" 
    //   xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" 
    //   ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3" 
    //   Version="2.0" ProviderName="SP test" 
    //   IssueInstant="2014-07-16T23:52:45Z" 
    //   Destination="http://idp.example.com/SSOService.php" 
    //   ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
    //   AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
    //     <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
    //     <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
    //     <samlp:RequestedAuthnContext Comparison="exact">
    //         <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
    //     </samlp:RequestedAuthnContext>
    // 	<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    // 	  <ds:SignedInfo>
    // 	    <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
    // 	    <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
    // 	    <ds:Reference URI="#pfx41d8ef22-e612-8c50-9960-1b16f15741b3">
    // 	      <ds:Transforms>
    // 	        <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
    // 	        <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
    // 	      </ds:Transforms>
    // 	      <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
    // 	      <ds:DigestValue>5d+/YNShy4qnvZcvik8fHHg2SWQ=</ds:DigestValue>
    // 	    </ds:Reference>
    // 	  </ds:SignedInfo>
    // 	  <ds:SignatureValue>QS16H5...U5LQ==</ds:SignatureValue>
    // 	  <ds:KeyInfo>
    // 	    <ds:X509Data>
    // 	      <ds:X509Certificate>MIIF...tjlF4=</ds:X509Certificate>
    // 	    </ds:X509Data>
    // 	  </ds:KeyInfo>
    // 	</ds:Signature>
    // </samlp:AuthnRequest>
    // 

    xmlToSign.DisposeXml()
    gen.DisposeXmlDSigGen()
    cert.DisposeCert()
    sbXml.DisposeStringBuilder()
    verifier.DisposeXmlDSig()