应用Reader扩展
Reader扩展允许您处理PDF文档的使用权限。 使用权限与Acrobat中提供的功能有关，但不与Adobe Reader中的功能有关。 由Reader扩展控制的功能包括向文档添加注释、填写表单和保存文档的功能。 已添加使用权限的PDF文档称为启用权限的文档。 在Adobe Reader中打开启用了权限的PDF文档的用户可以执行为该文档启用的操作。
要完成此用例，我们需要执行以下操作：
- 将Reader扩展证书添加到
fd-service用户。
创建自定义OSGi服务
创建将应用使用权限到文档的自定义OSGi服务。 下面列出了完成此任务的代码
import com.adobe.aemfd.docmanager.Document;
import com.adobe.fd.docassurance.client.api.DocAssuranceService;
import com.adobe.fd.docassurance.client.api.ReaderExtensionOptions;
import com.adobe.fd.readerextensions.client.ReaderExtensionsOptionSpec;
import com.adobe.fd.readerextensions.client.UsageRights;
import com.adobe.fd.signatures.pdf.inputs.UnlockOptions;
import com.aemforms.ares.core.ReaderExtendPDF;
import com.mergeandfuse.getserviceuserresolver.GetResolver;
@Component(service = ApplyUsageRights.class)
public class ApplyUsageRights implements ReaderExtendPDF {
@Reference
DocAssuranceService docAssuranceService;
@Reference
GetResolver getResolver;
Logger logger = LoggerFactory.getLogger(ApplyUsageRights.class);
@Override
public Document applyUsageRights(Document pdfDocument, UsageRights usageRights) {
ReaderExtensionsOptionSpec reOptionsSpec = new ReaderExtensionsOptionSpec(usageRights, "Sample ARES");
UnlockOptions unlockOptions = null;
ReaderExtensionOptions reOptions = ReaderExtensionOptions.getInstance();
reOptions.setCredentialAlias("ares");
reOptions.setResourceResolver(getResolver.getFormsServiceResolver());
reOptions.setReOptions(reOptionsSpec);
System.out.println("Applying Usage Rights");
try {
Document readerExtended = docAssuranceService.secureDocument(pdfDocument, null, null, reOptions,
unlockOptions);
reOptions.getResourceResolver().close();
return readerExtended;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
创建servlet以流式传输reader extended PDF
下一步是使用POST方法创建一个servlet，以将reader extended PDF返回给用户。 在这种情况下，要求用户将PDF保存到其文件系统。 这是因为PDF呈现为动态PDF，而浏览器附带的pdf查看器无法处理动态pdf。
以下是servlet的代码。 从自适应表单的customsubmit操作调用servlet。
Servlet创建UsageRights对象，并根据用户在自适应表单中输入的值设置其属性。 然后，servlet调用为此目的创建的服务的applyUsageRights方法。
package com.aemforms.ares.core.servlets;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.util.Map;
import javax.servlet.Servlet;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.request.RequestParameter;
import org.apache.sling.api.request.RequestParameterMap;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import com.adobe.aemfd.docmanager.Document;
import com.adobe.fd.readerextensions.client.UsageRights;
import com.aemforms.ares.core.impl.ApplyUsageRights;
@Component(service = Servlet.class, property = {
"sling.servlet.methods=post",
"sling.servlet.paths=/bin/applyrights"
})
public class GetReaderExtendedPDF extends SlingAllMethodsServlet {
private static final long serialVersionUID = -883724052368090823 L;
@Reference
ApplyUsageRights applyRights;
Logger logger = LoggerFactory.getLogger(GetReaderExtendedPDF.class);
public org.w3c.dom.Document w3cDocumentFromStrng(String xmlString) {
try {
System.out.println("the submitted data is " + xmlString);
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xmlString));
return db.parse(is);
} catch (Exception e) {
logger.debug(e.getMessage());
}
return null;
}
@Override
protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) {
doPost(request, response);
}
@Override
protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) {
System.out.println("In my do POST");
UsageRights usageRights = new UsageRights();
String submittedData = request.getParameter("jcr:data");
org.w3c.dom.Document submittedXml = w3cDocumentFromStrng(submittedData);
usageRights.setEnabledDynamicFormFields(true);
usageRights.setEnabledDynamicFormPages(true);
usageRights.setEnabledFormDataImportExport(true);
usageRights.setEnabledFormFillIn(Boolean.valueOf(submittedXml.getElementsByTagName("formfill").item(0).getTextContent()));
usageRights.setEnabledComments(Boolean.valueOf(submittedXml.getElementsByTagName("comments").item(0).getTextContent()));
usageRights.setEnabledEmbeddedFiles(Boolean.valueOf(submittedXml.getElementsByTagName("attachments").item(0).getTextContent()));
usageRights.setEnabledDigitalSignatures(Boolean.valueOf(submittedXml.getElementsByTagName("digitalsignatures").item(0).getTextContent()));
usageRights.setEnabledBarcodeDecoding(Boolean.valueOf(submittedXml.getElementsByTagName("barcode").item(0).getTextContent()));
RequestParameterMap requestParameterMap = request.getRequestParameterMap();
for (Map.Entry < String, RequestParameter[] > pairs: requestParameterMap.entrySet()) {
final org.apache.sling.api.request.RequestParameter[] pArr = pairs.getValue();
final org.apache.sling.api.request.RequestParameter param = pArr[0];
if (!param.isFormField()) {
try {
System.out.println("Got form attachment!!!!" + param.getFileName());
logger.debug("Got attachment!!!!" + param.getFileName());
InputStream is = param.getInputStream();
Document documentToReaderExtend = new Document(is);
documentToReaderExtend = applyRights.applyUsageRights(documentToReaderExtend, usageRights);
if (logger.isDebugEnabled()) {
documentToReaderExtend.copyToFile(new File(param.getFileName().split("/")[1]));
}
InputStream fileInputStream = documentToReaderExtend.getInputStream();
response.setContentType("application/pdf");
response.addHeader("Content-Disposition", "attachment; filename=" + param.getFileName().split("/")[1]);
response.setContentLength((int) fileInputStream.available());
OutputStream responseOutputStream = response.getOutputStream();
documentToReaderExtend.close();
int bytes;
while ((bytes = fileInputStream.read()) != -1) {
responseOutputStream.write(bytes);
}
responseOutputStream.flush();
responseOutputStream.close();
} catch (IOException e) {
logger.debug("Exception in streaming pdf back to client " + e.getMessage());
}
}
}
}
}
要在本地服务器上对此进行测试，请执行以下步骤：
-
使用configMgr控制台将以下条目添加到Apache Sling用户映射器服务，如下所示
DevelopingWithServiceUser.core:getformsresourceresolver=fd-service
- 下载并安装ares.ares.core-ares包。 它有自定义服务和servlet以应用使用权限并流式传输PDF。
- 导入客户端库和自定义提交
- 导入自适应表单
- 将Reader扩展证书添加到“fd-service”用户。 确保别名为“ares”。
- 预览自适应表单
- 选择适当的权限并上传PDF文件
- 单击提交以获取Reader Extended PDF
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