com.xerox.amazonws.ec2.UploadPolicy.java Source code

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Here is the source code for com.xerox.amazonws.ec2.UploadPolicy.java

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//
// typica - A client library for Amazon Web Services
// Copyright (C) 2008,2009 Xerox Corporation
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

package com.xerox.amazonws.ec2;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * This class describes the upload policy used when bundling images. 
 */
public class UploadPolicy {
    private static Log logger = LogFactory.getLog(UploadPolicy.class);

    private int minutesToExpiration;
    private String bucket;
    private String acl;
    private String prefix;

    public UploadPolicy(int minutesToExpiration, String bucket, String acl, String prefix) {
        this.minutesToExpiration = minutesToExpiration;
        this.bucket = bucket;
        this.acl = acl;
        this.prefix = prefix;
    }

    UploadPolicy(String jsonPolicyString) {
        // TODO: parse json string.. do we really want another dependency??
    }

    public int getMinutesToExpiration() {
        return minutesToExpiration;
    }

    public String getBucket() {
        return bucket;
    }

    public String getAcl() {
        return acl;
    }

    public String getPrefix() {
        return prefix;
    }

    public String getPolicyString() {
        StringBuilder json = new StringBuilder("{\n");
        json.append("\"expiration\": \"");
        final String DateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'";
        SimpleDateFormat format = new SimpleDateFormat(DateFormat, Locale.US);
        format.setTimeZone(TimeZone.getTimeZone("GMT"));
        json.append(format.format(new Date(System.currentTimeMillis() + (minutesToExpiration * 60000L))));
        json.append("\",\n");
        json.append("\"conditions\": [\n");

        json.append("{\"acl\": \"");
        json.append(acl);
        json.append("\"},\n");

        json.append("{\"bucket\": \"");
        json.append(bucket);
        json.append("\"},\n");

        json.append("[\"starts-with\", \"$key\", \"");
        json.append(prefix);
        json.append("\"],\n");

        json.append("]\n}");
        logger.debug("JSON policy string = " + json.toString());
        return new String(Base64.encodeBase64(json.toString().getBytes()));
    }

    public String toString() {
        return "UploadPolicy[minutesToExpiration=" + minutesToExpiration + ", bucket=" + this.bucket + ", acl="
                + this.acl + "]";
    }
}