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78 lines
2.6 KiB
78 lines
2.6 KiB
// URLLicense.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 03.07.2007 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.data;
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import java.util.HashMap;
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import java.util.Random;
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import de.anomic.yacy.yacyURL;
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public class URLLicense {
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// this class defines a license-generation for URLs
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// it is used in case of snippet- and preview-Image-fetching to grant also non-authorized users the usage of a image-fetcher servlet
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private Random random;
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private HashMap<String, yacyURL> permissions;
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private int keylen;
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public URLLicense(int keylen) {
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this.permissions = new HashMap<String, yacyURL>();
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this.random = new Random(System.currentTimeMillis());
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this.keylen = keylen;
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}
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public String aquireLicense(yacyURL url) {
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// generate license key
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String license = "";
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while (license.length() < keylen) license += Integer.toHexString(random.nextInt());
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license = license.substring(0, keylen);
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// store reference to url with license key
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synchronized (permissions) {
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permissions.put(license, url);
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}
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// return the license key
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return license;
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}
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public yacyURL releaseLicense(String license) {
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yacyURL url = null;
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synchronized (permissions) {
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url = permissions.remove(license);
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}
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/*
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if (url == null) {
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System.out.println("DEBUG-URLLICENSE: no URL license present for code=" + license);
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} else {
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System.out.println("DEBUG-URLLICENSE: granted download of " + url.toString());
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}
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*/
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return url;
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}
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}
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