- add standalone presentation checker

bigbluebutton-web/pres-checker/.gitignore

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+lib/
+build/
+.gradle
+

bigbluebutton-web/pres-checker/build.gradle

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+apply plugin: 'java'
+
+sourceCompatibility=1.8
+targetCompatibility=1.8
+
+version = '0.0.1'
+archivesBaseName = 'bbb-pres-check' 
+
+task resolveDeps(type: Copy) {
+    into('lib')
+    from configurations.default
+    from configurations.default.allArtifacts.file
+}
+
+repositories {
+  mavenCentral()
+  mavenLocal()
+}
+
+dependencies {	   
+	compile 'org.apache.poi:poi:3.15@jar'  
+   compile 'org.apache.poi:poi-ooxml:3.15@jar'
+   compile 'org.apache.poi:poi-ooxml-schemas:3.15@jar'
+	compile 'commons-io:commons-io:2.4@jar'
+   compile 'org.apache.commons:commons-lang3:3.5@jar'
+   compile 'org.apache.commons:commons-collections4:4.1@jar'
+   compile 'org.apache.xmlbeans:xmlbeans:2.6.0@jar'
+}
+
+jar {
+   manifest.mainAttributes("Permissions": "all-permissions")
+   manifest.mainAttributes("Codebase": "*")
+   manifest.mainAttributes("Application-Name": "BigBlueButton Presentation Checker")
+   manifest.mainAttributes("Application-Library-Allowable-Codebase": "*")
+   manifest.mainAttributes("Caller-Allowable-Codebase": "*")
+   manifest.mainAttributes("Trusted-Only": "true")
+}
+

bigbluebutton-web/pres-checker/build.sh

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+gradle clean
+gradle jar
+cp build/lib/*.jar lib
+

bigbluebutton-web/pres-checker/run.sh

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+java -cp "lib/*" org.bigbluebutton.prescheck.Main $@
+

bigbluebutton-web/pres-checker/src/main/java/org/bigbluebutton/prescheck/Main.java

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+package org.bigbluebutton.prescheck;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.collections4.Predicate;
+import org.apache.commons.io.FilenameUtils;
+import org.apache.poi.util.LittleEndian;
+import org.apache.poi.xslf.usermodel.XMLSlideShow;
+import org.apache.poi.xslf.usermodel.XSLFPictureData;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class Main {
+
+  public static void main(String[] args) {
+    Main main = new Main();
+
+    String filepath;
+    try {
+       // Parse the string argument into an integer value.
+       filepath = args[0];
+       boolean valid = main.check(main, filepath);
+       if (!valid) System.exit(2);
+       	System.exit(0);
+    }
+    catch (Exception nfe) {
+       System.exit(1);
+    }
+
+  }
+
+  private boolean check(Main main, String file) {
+  	boolean valid = true;
+  	XMLSlideShow xmlSlideShow;
+      try {
+        xmlSlideShow = new XMLSlideShow(new FileInputStream(file));
+        valid &= !main.embedsEmf(xmlSlideShow);
+        valid &= !main.containsTinyTileBackground(xmlSlideShow);
+        // Close the resource once we finished reading it
+        xmlSlideShow.close();
+      } catch (IOException e) {
+        valid = false;
+      }
+
+      return valid;
+  }
+
+    /**
+   * Checks if the slide-show file embeds any EMF document
+   * 
+   * @param xmlSlideShow
+   * @return
+   */
+  private boolean embedsEmf(XMLSlideShow xmlSlideShow) {
+    EmfPredicate emfPredicate = new EmfPredicate();
+    ArrayList<XSLFPictureData> embeddedEmfFiles = (ArrayList<XSLFPictureData>) CollectionUtils
+        .select(xmlSlideShow.getPictureData(), emfPredicate);
+    if (embeddedEmfFiles.size() > 0) {
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Checks if the slide-show contains a small background tile image
+   * 
+   * @param xmlSlideShow
+   * @return
+   */
+  private boolean containsTinyTileBackground(XMLSlideShow xmlSlideShow) {
+    TinyTileBackgroundPredicate tinyTileCondition = new TinyTileBackgroundPredicate();
+    ArrayList<XSLFPictureData> tileImage = (ArrayList<XSLFPictureData>) CollectionUtils
+        .select(xmlSlideShow.getPictureData(), tinyTileCondition);
+    if (tileImage.size() > 0) {
+      return true;
+    }
+    return false;
+  }
+
+  private final class EmfPredicate implements Predicate<XSLFPictureData> {
+    public boolean evaluate(XSLFPictureData img) {
+      return img.getContentType().equals("image/x-emf");
+    }
+  }
+
+  private final class TinyTileBackgroundPredicate
+      implements Predicate<XSLFPictureData> {
+    public boolean evaluate(XSLFPictureData img) {
+      return img.getContentType() != null
+          && img.getContentType().equals("image/jpeg")
+          && LittleEndian.getLong(img.getChecksum()) == 4114937224L;
+    }
+  }
+}