Alfresco Share: what shall I do to integrate electronic signatures?

I'd like to have re开发者_C百科liable document workflow within Alfresco Share (Community Edition). What shall I do to let site users have electronic signatures when they process documents?

I googled awhile but in vain.

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The PDF Toolkit provides digital signature functionality for PDFs, which may provide some ideas on how to extend Alfresco to support a more general digital signature feature.

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You can use a custom java class to load in a document and put the digital signature there e.g.:

<node name="signDocument">
    <event type="node-enter">
        <action class="mypackage.SignDigitalDocument">
                <document>
                    // Document node
                </document>
                <user>
                    // User name, maybe for adding a signature label
                </user>
                <signature>
                    // Digital signature.........
                </signature>
            </action
    </event>
</node>

Within the custom Java class you can read the entries and do e.g. a FileInputStream and get the document. Just look at Content Transformers Here you should have enough info to code your own tranformer.