Java tutorial
/* * Copyright 2012-2013 Alfresco Software Limited. * * Licensed under the GNU Affero General Public License, Version 3.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.gnu.org/licenses/agpl-3.0.html * * If you do not wish to be bound to the terms of the AGPL v3.0, * A commercial license may be obtained by contacting the author. * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of an unsupported extension to Alfresco. * */ package org.alfresco.extension.countersign.action.executer; import java.io.IOException; import java.io.OutputStream; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import org.alfresco.error.AlfrescoRuntimeException; import org.alfresco.extension.countersign.model.CounterSignSignatureModel; import org.alfresco.model.ContentModel; import org.alfresco.repo.action.ParameterDefinitionImpl; import org.alfresco.service.cmr.action.Action; import org.alfresco.service.cmr.action.ParameterDefinition; import org.alfresco.service.cmr.dictionary.DataTypeDefinition; import org.alfresco.service.cmr.repository.ContentReader; import org.alfresco.service.cmr.repository.NodeRef; import org.alfresco.service.cmr.repository.NodeService; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; import com.itextpdf.text.DocumentException; import com.itextpdf.text.Rectangle; import com.itextpdf.text.pdf.AcroFields; import com.itextpdf.text.pdf.PdfAnnotation; import com.itextpdf.text.pdf.PdfBorderArray; import com.itextpdf.text.pdf.PdfBorderDictionary; import com.itextpdf.text.pdf.PdfFormField; import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfStamper; public class PDFAddSignatureFieldActionExecuter extends AbstractSignatureActionExecuter { /** * The logger */ private static Log logger = LogFactory.getLog(PDFSignatureProviderActionExecuter.class); private JSONParser parser = new JSONParser(); public static final String PARAM_POSITION = "position"; public static final String PARAM_FIELDNAME = "field-name"; /** * Add parameter definitions */ @Override protected void addParameterDefinitions(List<ParameterDefinition> paramList) { paramList.add(new ParameterDefinitionImpl(PARAM_FIELDNAME, DataTypeDefinition.TEXT, true, getParamDisplayLabel(PARAM_FIELDNAME))); paramList.add(new ParameterDefinitionImpl(PARAM_POSITION, DataTypeDefinition.TEXT, true, getParamDisplayLabel(PARAM_POSITION))); } /** * @see org.alfresco.repo.action.executer.ActionExecuterAbstractBase#executeImpl(org.alfresco.service.cmr.repository.NodeRef, * org.alfresco.service.cmr.repository.NodeRef) */ protected void executeImpl(Action ruleAction, NodeRef actionedUponNodeRef) { NodeService ns = serviceRegistry.getNodeService(); if (ns.exists(actionedUponNodeRef) == false) { // node doesn't exist - can't do anything return; } String fieldName = (String) ruleAction.getParameterValue(PARAM_FIELDNAME); String position = (String) ruleAction.getParameterValue(PARAM_POSITION); JSONObject box; int page = -1; // parse out the position JSON JSONObject positionObj = null; try { positionObj = (JSONObject) parser.parse(position); } catch (ParseException e) { logger.error("Could not parse position JSON from Share"); throw new AlfrescoRuntimeException("Could not parse position JSON from Share"); } // get the page page = Integer.parseInt(String.valueOf(positionObj.get("page"))); // get the box box = (JSONObject) positionObj.get("box"); try { // open original pdf ContentReader pdfReader = getReader(actionedUponNodeRef); PdfReader reader = new PdfReader(pdfReader.getContentInputStream()); OutputStream cos = serviceRegistry.getContentService() .getWriter(actionedUponNodeRef, ContentModel.PROP_CONTENT, true).getContentOutputStream(); PdfStamper stamp = new PdfStamper(reader, cos); // does a field with this name already exist? AcroFields allFields = stamp.getAcroFields(); // if this doc is already signed, cannot add a new sig field without if (allFields.getSignatureNames() != null && allFields.getSignatureNames().size() > 0) { throw new AlfrescoRuntimeException("This document has signatures applied, " + "adding a new signature field would invalidate existing signatures"); } // cant create duplicate field names if (allFields.getFieldType(fieldName) == AcroFields.FIELD_TYPE_SIGNATURE) { throw new AlfrescoRuntimeException( "A signature field named " + fieldName + " already exists in this document"); } // create the signature field Rectangle pageRect = reader.getPageSizeWithRotation(page); Rectangle sigRect = positionBlock(pageRect, box); PdfFormField sigField = stamp.addSignature(fieldName, page, sigRect.getLeft(), sigRect.getBottom(), sigRect.getRight(), sigRect.getTop()); // style the field (no borders) sigField.setBorder(new PdfBorderArray(0, 0, 0)); sigField.setBorderStyle(new PdfBorderDictionary(0, PdfBorderDictionary.STYLE_SOLID)); allFields.regenerateField(fieldName); // apply the change and close streams stamp.close(); reader.close(); cos.close(); // once the signature field has been added, apply the sig field aspect if (!ns.hasAspect(actionedUponNodeRef, CounterSignSignatureModel.ASPECT_SIGNABLE)) { ns.addAspect(actionedUponNodeRef, CounterSignSignatureModel.ASPECT_SIGNABLE, null); } // now update the signature fields metadata Serializable currentFields = ns.getProperty(actionedUponNodeRef, CounterSignSignatureModel.PROP_SIGNATUREFIELDS); ArrayList<String> fields = new ArrayList<String>(); if (currentFields != null) { fields.addAll((List<String>) currentFields); } fields.add(fieldName); ns.setProperty(actionedUponNodeRef, CounterSignSignatureModel.PROP_SIGNATUREFIELDS, fields); } catch (IOException ioex) { throw new AlfrescoRuntimeException(ioex.getMessage()); } catch (DocumentException dex) { throw new AlfrescoRuntimeException(dex.getMessage()); } } }