PkgServlet.java

   1 package org.argeo.cms.servlet.internal;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.net.URL;
   6 import java.util.Collection;
   7 import java.util.SortedMap;
   8 import java.util.TreeMap;
   9
  10 import javax.servlet.ServletException;
  11 import javax.servlet.http.HttpServlet;
  12 import javax.servlet.http.HttpServletRequest;
  13 import javax.servlet.http.HttpServletResponse;
  14
  15 import org.apache.commons.io.IOUtils;
  16 import org.argeo.cms.osgi.PublishNamespace;
  17 import org.argeo.osgi.util.FilterRequirement;
  18 import org.osgi.framework.Bundle;
  19 import org.osgi.framework.BundleContext;
  20 import org.osgi.framework.FrameworkUtil;
  21 import org.osgi.framework.Version;
  22 import org.osgi.framework.VersionRange;
  23 import org.osgi.framework.namespace.PackageNamespace;
  24 import org.osgi.framework.wiring.BundleCapability;
  25 import org.osgi.framework.wiring.BundleWiring;
  26 import org.osgi.framework.wiring.FrameworkWiring;
  27 import org.osgi.resource.Requirement;
  28
  29 public class PkgServlet extends HttpServlet {
  30         private static final long serialVersionUID = 7660824185145214324L;
  31
  32         private BundleContext bundleContext = FrameworkUtil.getBundle(PkgServlet.class).getBundleContext();
  33
  34         @Override
  35         protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  36                 String pathInfo = req.getPathInfo();
  37
  38                 String pkg, versionStr, file;
  39                 String[] parts = pathInfo.split("/");
  40                 // first is always empty
  41                 if (parts.length == 4) {
  42                         pkg = parts[1];
  43                         versionStr = parts[2];
  44                         file = parts[3];
  45                 } else if (parts.length == 3) {
  46                         pkg = parts[1];
  47                         versionStr = null;
  48                         file = parts[2];
  49                 } else {
  50                         throw new IllegalArgumentException("Unsupported path length " + pathInfo);
  51                 }
  52
  53                 FrameworkWiring frameworkWiring = bundleContext.getBundle(0).adapt(FrameworkWiring.class);
  54                 String filter;
  55                 if (versionStr == null) {
  56                         filter = "(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")";
  57                 } else {
  58                         if (versionStr.startsWith("[") || versionStr.startsWith("(")) {// range
  59                                 VersionRange versionRange = new VersionRange(versionStr);
  60                                 filter = "(&(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")"
  61                                                 + versionRange.toFilterString(PackageNamespace.CAPABILITY_VERSION_ATTRIBUTE) + ")";
  62
  63                         } else {
  64                                 Version version = new Version(versionStr);
  65                                 filter = "(&(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")("
  66                                                 + PackageNamespace.CAPABILITY_VERSION_ATTRIBUTE + "=" + version + "))";
  67                         }
  68                 }
  69                 Requirement requirement = new FilterRequirement(PackageNamespace.PACKAGE_NAMESPACE, filter);
  70                 Collection<BundleCapability> packages = frameworkWiring.findProviders(requirement);
  71                 if (packages.isEmpty()) {
  72                         resp.sendError(404);
  73                         return;
  74                 }
  75
  76                 // TODO verify that it works with multiple versions
  77                 SortedMap<Version, BundleCapability> sorted = new TreeMap<>();
  78                 for (BundleCapability capability : packages) {
  79                         sorted.put(capability.getRevision().getVersion(), capability);
  80                 }
  81
  82                 Bundle bundle = sorted.get(sorted.firstKey()).getRevision().getBundle();
  83                 String entryPath = '/' + pkg.replace('.', '/') + '/' + file;
  84                 URL internalURL = bundle.getResource(entryPath);
  85                 if (internalURL == null) {
  86                         resp.sendError(404);
  87                         return;
  88                 }
  89
  90                 // Resource found, we now check whether it can be published
  91                 boolean publish = false;
  92                 BundleWiring bundleWiring = bundle.adapt(BundleWiring.class);
  93                 capabilities: for (BundleCapability bundleCapability : bundleWiring
  94                                 .getCapabilities(PublishNamespace.CMS_PUBLISH_NAMESPACE)) {
  95                         Object publishedPkg = bundleCapability.getAttributes().get(PublishNamespace.PKG);
  96                         if (publishedPkg != null) {
  97                                 if (publishedPkg.equals("*") || publishedPkg.equals(pkg)) {
  98                                         Object publishedFile = bundleCapability.getAttributes().get(PublishNamespace.FILE);
  99                                         if (publishedFile == null) {
 100                                                 publish = true;
 101                                                 break capabilities;
 102                                         } else {
 103                                                 String[] publishedFiles = publishedFile.toString().split(",");
 104                                                 for (String pattern : publishedFiles) {
 105                                                         if (pattern.startsWith("*.")) {
 106                                                                 String ext = pattern.substring(1);
 107                                                                 if (file.endsWith(ext)) {
 108                                                                         publish = true;
 109                                                                         break capabilities;
 110                                                                 }
 111                                                         } else {
 112                                                                 if (publishedFile.equals(file)) {
 113                                                                         publish = true;
 114                                                                         break capabilities;
 115                                                                 }
 116                                                         }
 117                                                 }
 118                                         }
 119                                 }
 120                         }
 121                 }
 122
 123                 if (!publish) {
 124                         resp.sendError(404);
 125                         return;
 126                 }
 127
 128                 try (InputStream in = internalURL.openStream()) {
 129                         IOUtils.copy(in, resp.getOutputStream());
 130                 }
 131         }
 132
 133 }