public XMLSignature()

in src/main/java/org/apache/xml/security/signature/XMLSignature.java [540:632]
68 lines of code
21 McCabe index (conditional complexity)

    public XMLSignature(Element element, String baseURI, boolean secureValidation, Provider provider)
        throws XMLSignatureException, XMLSecurityException {
        super(element, baseURI);

        if (!(Constants.SignatureSpecNS.equals(element.getNamespaceURI())
            && Constants._TAG_SIGNATURE.equals(element.getLocalName()))) {
            Object[] exArgs = { element.getLocalName() };
            throw new XMLSignatureException("signature.Verification.InvalidElement", exArgs);
        }

        // check out SignedInfo child
        Element signedInfoElem = XMLUtils.getNextElement(element.getFirstChild());

        // check to see if it is there
        if (signedInfoElem == null ||
            !(Constants.SignatureSpecNS.equals(signedInfoElem.getNamespaceURI())
                && Constants._TAG_SIGNEDINFO.equals(signedInfoElem.getLocalName()))) {
            Object[] exArgs = { Constants._TAG_SIGNEDINFO, Constants._TAG_SIGNATURE };
            throw new XMLSignatureException("xml.WrongContent", exArgs);
        }

        // create a SignedInfo object from that element
        this.signedInfo = new SignedInfo(signedInfoElem, baseURI, secureValidation, provider);
        // get signedInfoElem again in case it has changed
        signedInfoElem = XMLUtils.getNextElement(element.getFirstChild());

        // check out SignatureValue child
        this.signatureValueElement =
            XMLUtils.getNextElement(signedInfoElem.getNextSibling());

        // check to see if it exists
        if (signatureValueElement == null ||
            !(Constants.SignatureSpecNS.equals(signatureValueElement.getNamespaceURI())
                && Constants._TAG_SIGNATUREVALUE.equals(signatureValueElement.getLocalName()))) {
            Object[] exArgs = { Constants._TAG_SIGNATUREVALUE, Constants._TAG_SIGNATURE };
            throw new XMLSignatureException("xml.WrongContent", exArgs);
        }
        Attr signatureValueAttr = signatureValueElement.getAttributeNodeNS(null, "Id");
        if (signatureValueAttr != null) {
            signatureValueElement.setIdAttributeNode(signatureValueAttr, true);
        }

        // <element ref="ds:KeyInfo" minOccurs="0"/>
        Element keyInfoElem =
            XMLUtils.getNextElement(signatureValueElement.getNextSibling());

        // If it exists use it, but it's not mandatory
        Element objectElem = null;
        if (keyInfoElem != null
            && Constants.SignatureSpecNS.equals(keyInfoElem.getNamespaceURI())
            && Constants._TAG_KEYINFO.equals(keyInfoElem.getLocalName())) {
            this.keyInfo = new KeyInfo(keyInfoElem, baseURI);
            this.keyInfo.setSecureValidation(secureValidation);
            objectElem = XMLUtils.getNextElement(keyInfoElem.getNextSibling());
        } else {
            // If we have no KeyInfo
            objectElem = keyInfoElem;
        }

        // <element ref="ds:Object" minOccurs="0" maxOccurs="unbounded"/>
        while (objectElem != null) {
            // Make sure it actually is an Object
            if (!(Constants.SignatureSpecNS.equals(objectElem.getNamespaceURI())
                && Constants._TAG_OBJECT.equals(objectElem.getLocalName()))) {
                Object[] exArgs = { objectElem.getLocalName() };
                throw new XMLSignatureException("signature.Verification.InvalidElement", exArgs);
            }

            Attr objectAttr = objectElem.getAttributeNodeNS(null, "Id");
            if (objectAttr != null) {
                objectElem.setIdAttributeNode(objectAttr, true);
            }

            Node firstChild = objectElem.getFirstChild();
            // Register Ids of the Object child elements
            while (firstChild != null) {
                if (firstChild.getNodeType() == Node.ELEMENT_NODE) {
                    Element childElem = (Element)firstChild;
                    String tag = childElem.getLocalName();
                    if ("Manifest".equals(tag)) {
                        new Manifest(childElem, baseURI);
                    } else if ("SignatureProperties".equals(tag)) {
                        new SignatureProperties(childElem, baseURI);
                    }
                }
                firstChild = firstChild.getNextSibling();
            }

            objectElem = XMLUtils.getNextElement(objectElem.getNextSibling());
        }

        this.state = MODE_VERIFY;
    }