- images may be requested by localhost and authorized users only, if the request is done using a clear-text URL - the image may be requested also using a code that can be a license to retrieve a URL for everyone - some servelets produce URL licenses for ViewImage, like image search results git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4027 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
18 years ago
parent
9a860cf397
commit
62347b50f4
@ -0,0 +1,75 @@
|
||||
// URLLicense.java
|
||||
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
||||
// first published 03.07.2007 on http://yacy.net
|
||||
//
|
||||
// This is a part of YaCy, a peer-to-peer based web search engine
|
||||
//
|
||||
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
|
||||
// $LastChangedRevision: 1986 $
|
||||
// $LastChangedBy: orbiter $
|
||||
//
|
||||
// LICENSE
|
||||
//
|
||||
// This program is free software; you can redistribute it and/or modify
|
||||
// it under the terms of the GNU General Public License as published by
|
||||
// the Free Software Foundation; either version 2 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// This program is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU General Public License
|
||||
// along with this program; if not, write to the Free Software
|
||||
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
|
||||
package de.anomic.data;
|
||||
|
||||
import java.util.HashMap;
|
||||
import java.util.Random;
|
||||
|
||||
import de.anomic.net.URL;
|
||||
|
||||
public class URLLicense {
|
||||
|
||||
// this class defines a license-generation for URLs
|
||||
// it is used in case of snippet- and preview-Image-fetching to grant also non-authorized users the usage of a image-fetcher servlet
|
||||
|
||||
private Random random;
|
||||
private HashMap permissions;
|
||||
private int keylen;
|
||||
|
||||
public URLLicense(int keylen) {
|
||||
this.permissions = new HashMap();
|
||||
this.random = new Random(System.currentTimeMillis());
|
||||
this.keylen = keylen;
|
||||
}
|
||||
|
||||
public String aquireLicense(URL url) {
|
||||
// generate license key
|
||||
String license = "";
|
||||
while (license.length() < keylen) license += Integer.toHexString(random.nextInt());
|
||||
license = license.substring(0, keylen);
|
||||
// store reference to url with license key
|
||||
synchronized (permissions) {
|
||||
permissions.put(license, url);
|
||||
}
|
||||
// return the license key
|
||||
return license;
|
||||
}
|
||||
|
||||
public URL releaseLicense(String license) {
|
||||
URL url = null;
|
||||
synchronized (permissions) {
|
||||
url = (URL) permissions.remove(license);
|
||||
}
|
||||
if (url == null) {
|
||||
System.out.println("DEBUG-URLLICENSE: no URL license present for code=" + license);
|
||||
} else {
|
||||
System.out.println("DEBUG-URLLICENSE: granted download of " + url.toString());
|
||||
}
|
||||
return url;
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in new issue