org.argeo.cms/src/org/argeo/cms/internal/http/PkgServlet.java

   1 package org.argeo.cms.internal.http;
   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.Enumeration;
   8 import java.util.SortedMap;
   9 import java.util.TreeMap;
  10
  11 import javax.servlet.ServletException;
  12 import javax.servlet.http.HttpServlet;
  13 import javax.servlet.http.HttpServletRequest;
  14 import javax.servlet.http.HttpServletResponse;
  15
  16 import org.apache.commons.io.IOUtils;
  17 import org.argeo.api.PublishNamespace;
  18 import org.argeo.osgi.util.FilterRequirement;
  19 import org.osgi.framework.Bundle;
  20 import org.osgi.framework.BundleContext;
  21 import org.osgi.framework.FrameworkUtil;
  22 import org.osgi.framework.Version;
  23 import org.osgi.framework.VersionRange;
  24 import org.osgi.framework.namespace.PackageNamespace;
  25 import org.osgi.framework.wiring.BundleCapability;
  26 import org.osgi.framework.wiring.BundleWiring;
  27 import org.osgi.framework.wiring.FrameworkWiring;
  28 import org.osgi.resource.Requirement;
  29
  30 public class PkgServlet extends HttpServlet {
  31         private static final long serialVersionUID = 7660824185145214324L;
  32
  33         private BundleContext bundleContext = FrameworkUtil.getBundle(PkgServlet.class).getBundleContext();
  34
  35         @Override
  36         protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  37                 String pathInfo = req.getPathInfo();
  38
  39                 String pkg, versionStr, file;
  40                 String[] parts = pathInfo.split("/");
  41                 // first is always empty
  42                 if (parts.length == 4) {
  43                         pkg = parts[1];
  44                         versionStr = parts[2];
  45                         file = parts[3];
  46                 } else if (parts.length == 3) {
  47                         pkg = parts[1];
  48                         versionStr = null;
  49                         file = parts[2];
  50                 } else {
  51                         throw new IllegalArgumentException("Unsupported path length " + pathInfo);
  52                 }
  53
  54                 FrameworkWiring frameworkWiring = bundleContext.getBundle(0).adapt(FrameworkWiring.class);
  55                 String filter;
  56                 if (versionStr == null) {
  57                         filter = "(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")";
  58                 } else {
  59                         if (versionStr.startsWith("[") || versionStr.startsWith("(")) {// range
  60                                 VersionRange versionRange = new VersionRange(versionStr);
  61                                 filter = "(&(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")"
  62                                                 + versionRange.toFilterString(PackageNamespace.CAPABILITY_VERSION_ATTRIBUTE) + ")";
  63
  64                         } else {
  65                                 Version version = new Version(versionStr);
  66                                 filter = "(&(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkg + ")("
  67                                                 + PackageNamespace.CAPABILITY_VERSION_ATTRIBUTE + "=" + version + "))";
  68                         }
  69                 }
  70                 Requirement requirement = new FilterRequirement(PackageNamespace.PACKAGE_NAMESPACE, filter);
  71                 Collection<BundleCapability> packages = frameworkWiring.findProviders(requirement);
  72                 if (packages.isEmpty()) {
  73                         resp.sendError(404);
  74                         return;
  75                 }
  76
  77                 // TODO verify that it works with multiple versions
  78                 SortedMap<Version, BundleCapability> sorted = new TreeMap<>();
  79                 for (BundleCapability capability : packages) {
  80                         sorted.put(capability.getRevision().getVersion(), capability);
  81                 }
  82
  83                 Bundle bundle = sorted.get(sorted.firstKey()).getRevision().getBundle();
  84                 String entryPath = '/' + pkg.replace('.', '/') + '/' + file;
  85                 URL internalURL = bundle.getResource(entryPath);
  86                 if (internalURL == null) {
  87                         resp.sendError(404);
  88                         return;
  89                 }
  90
  91                 // Resource found, we now check whether it can be published
  92                 boolean publish = false;
  93                 BundleWiring bundleWiring = bundle.adapt(BundleWiring.class);
  94                 capabilities: for (BundleCapability bundleCapability : bundleWiring
  95                                 .getCapabilities(PublishNamespace.CMS_PUBLISH_NAMESPACE)) {
  96                         Object publishedPkg = bundleCapability.getAttributes().get(PublishNamespace.PKG);
  97                         if (publishedPkg != null) {
  98                                 if (publishedPkg.equals("*") || publishedPkg.equals(pkg)) {
  99                                         Object publishedFile = bundleCapability.getAttributes().get(PublishNamespace.FILE);
 100                                         if (publishedFile == null) {
 101                                                 publish = true;
 102                                                 break capabilities;
 103                                         } else {
 104                                                 String[] publishedFiles = publishedFile.toString().split(",");
 105                                                 for (String pattern : publishedFiles) {
 106                                                         if (pattern.startsWith("*.")) {
 107                                                                 String ext = pattern.substring(1);
 108                                                                 if (file.endsWith(ext)) {
 109                                                                         publish = true;
 110                                                                         break capabilities;
 111                                                                 }
 112                                                         } else {
 113                                                                 if (publishedFile.equals(file)) {
 114                                                                         publish = true;
 115                                                                         break capabilities;
 116                                                                 }
 117                                                         }
 118                                                 }
 119                                         }
 120                                 }
 121                         }
 122                 }
 123
 124                 if (!publish) {
 125                         resp.sendError(404);
 126                         return;
 127                 }
 128
 129                 try (InputStream in = internalURL.openStream()) {
 130                         IOUtils.copy(in, resp.getOutputStream());
 131                 }
 132         }
 133
 134 }