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package hudson.plugins.emailext;

import hudson.EnvVars;
import hudson.util.FormValidation;
import org.apache.commons.lang.StringUtils;

import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import java.util.LinkedHashSet;
import java.util.Set;

public class EmailRecepientUtils
{
    public static final String COMMA_SEPARATED_SPLIT_REGEXP = "[,\\s]+";

    public Set convertRecipientString( String recipientList, EnvVars envVars )
        throws AddressException
    {
        final Set internetAddresses = new LinkedHashSet();
        if ( StringUtils.isBlank( recipientList ) )
        {
            return internetAddresses;
        }

        final String expandedRecipientList = envVars.expand( recipientList );
        final String[] addresses = StringUtils.trim( expandedRecipientList ).split( COMMA_SEPARATED_SPLIT_REGEXP );
        for ( String address : addresses )
        {
            internetAddresses.add( new InternetAddress( address ) );
        }

        return internetAddresses;
    }

    public FormValidation validateFormRecipientList( String recipientList )
    {
        // Try and convert the recipient string to a list of InternetAddress. If this fails then the validation fails.
        try
        {
            convertRecipientString( recipientList, new EnvVars() );
            return FormValidation.ok();
        }
        catch ( AddressException e )
        {
            return FormValidation.error( e.getMessage() + ": \"" + e.getRef() + "\"" );
        }
    }
}