com.enonic.cms.framework.freemarker.Base64Function.java Source code

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Here is the source code for com.enonic.cms.framework.freemarker.Base64Function.java

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/*
 * Copyright 2000-2011 Enonic AS
 * http://www.enonic.com/license
 */
package com.enonic.cms.framework.freemarker;

import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.commons.codec.binary.Base64;

import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModelException;

/**
 * This is a class representing a Freemarker function.
 */
@SuppressWarnings({ "UnusedDeclaration" })
public class Base64Function implements TemplateMethodModel {
    public Object exec(List arguments) throws TemplateModelException {
        if (arguments.size() != 1) {
            throw new TemplateModelException("This function requires one argument.");
        }

        Object argument = arguments.get(0);
        if (argument instanceof String) {
            String argumentAsString = (String) argument;
            return encodeAsBase64(argumentAsString);
        } else {
            throw new TemplateModelException("This function requires one argument that is a string.");
        }
    }

    private Object encodeAsBase64(String input) {
        try {
            return new String(Base64.encodeBase64(input.getBytes("UTF-8")));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("Failed to encode string: ", e);
        }
    }
}