Reverted deleted methods from PresentationUrlDownloadService.java

bigbluebutton-web/src/java/org/bigbluebutton/presentation/PresentationUrlDownloadService.java

@@ -2,8 +2,17 @@ package org.bigbluebutton.presentation;
 
 import java.io.File;
 import java.io.FilenameFilter;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
 
 import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.commons.httpclient.HttpClient;
+import org.apache.commons.httpclient.HttpException;
+import org.apache.commons.httpclient.HttpStatus;
+import org.apache.commons.httpclient.methods.GetMethod;
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.FilenameUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -12,6 +21,7 @@ public class PresentationUrlDownloadService {
     private static Logger log = LoggerFactory
             .getLogger(PresentationUrlDownloadService.class);
 
+    private final int maxRedirects = 5;
     private PageExtractor pageExtractor;
     private DocumentConversionService documentConversionService;
     private String presentationBaseURL;
@@ -93,6 +103,88 @@ public class PresentationUrlDownloadService {
         return null;
     }
 
+    private String followRedirect(String meetingId, String redirectUrl,
+            int redirectCount, String origUrl) {
+
+        if (redirectCount > maxRedirects) {
+            log.error("Max redirect reached for meeting=[{}] with url=[{}]",
+                    meetingId, origUrl);
+            return null;
+        }
+
+        URL presUrl;
+        try {
+            presUrl = new URL(redirectUrl);
+        } catch (MalformedURLException e) {
+            log.error("Malformed url=[{}] for meeting=[{}]", redirectUrl,
+                    meetingId);
+            return null;
+        }
+
+        HttpURLConnection conn;
+        try {
+            conn = (HttpURLConnection) presUrl.openConnection();
+            conn.setReadTimeout(5000);
+            conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
+            conn.addRequestProperty("User-Agent", "Mozilla");
+
+            // normally, 3xx is redirect
+            int status = conn.getResponseCode();
+            if (status != HttpURLConnection.HTTP_OK) {
+                if (status == HttpURLConnection.HTTP_MOVED_TEMP
+                        || status == HttpURLConnection.HTTP_MOVED_PERM
+                        || status == HttpURLConnection.HTTP_SEE_OTHER) {
+                    String newUrl = conn.getHeaderField("Location");
+                    return followRedirect(meetingId, newUrl, redirectCount + 1,
+                            origUrl);
+                } else {
+                    log.error(
+                            "Invalid HTTP response=[{}] for url=[{}] with meeting[{}]",
+                            status, redirectUrl, meetingId);
+                    return null;
+                }
+            } else {
+                return redirectUrl;
+            }
+        } catch (IOException e) {
+            log.error("IOException for url=[{}] with meeting[{}]", redirectUrl,
+                    meetingId);
+            return null;
+        }
+    }
+
+    public boolean savePresentation(final String meetingId,
+            final String filename, final String urlString) {
+
+        String finalUrl = followRedirect(meetingId, urlString, 0, urlString);
+
+        if (finalUrl == null)
+            return false;
+
+        boolean success = false;
+        GetMethod method = new GetMethod(finalUrl);
+        HttpClient client = new HttpClient();
+        try {
+            int statusCode = client.executeMethod(method);
+            if (statusCode == HttpStatus.SC_OK) {
+                FileUtils.copyInputStreamToFile(
+                        method.getResponseBodyAsStream(), new File(filename));
+                log.info("Downloaded presentation at [{}]", finalUrl);
+                success = true;
+            }
+        } catch (HttpException e) {
+            log.error("HttpException while downloading presentation at [{}]",
+                    finalUrl);
+        } catch (IOException e) {
+            log.error("IOException while downloading presentation at [{}]",
+                    finalUrl);
+        } finally {
+            method.releaseConnection();
+        }
+
+        return success;
+    }
+
     public void setPageExtractor(PageExtractor extractor) {
         this.pageExtractor = extractor;
     }