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/*
* MinIO Java SDK for Amazon S3 Compatible Cloud Storage, (C) 2015 MinIO, Inc.
*
* 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 io.minio;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.ListIterator;
import java.util.Map;
import org.joda.time.DateTime;
import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import com.google.common.io.BaseEncoding;
import io.minio.errors.InvalidArgumentException;
/**
* Post policy information to be used to generate presigned post policy form-data.
*/
public class PostPolicy {
private static final String ALGORITHM = "AWS4-HMAC-SHA256";
private final String bucketName;
private final String objectName;
private final boolean startsWith;
private final DateTime expirationDate;
private String contentType;
private String contentEncoding;
private long contentRangeStart;
private long contentRangeEnd;
public PostPolicy(String bucketName, String objectName, DateTime expirationDate)
throws InvalidArgumentException {
this(bucketName, objectName, false, expirationDate);
}
/**
* Creates PostPolicy for given bucket name, object name, string to match object name starting with
* and expiration time.
*/
public PostPolicy(String bucketName, String objectName, boolean startsWith, DateTime expirationDate)
throws InvalidArgumentException {
if (bucketName == null) {
throw new InvalidArgumentException("null bucket name");
}
this.bucketName = bucketName;
if (objectName == null) {
throw new InvalidArgumentException("null object name or prefix");
}
this.objectName = objectName;
this.startsWith = startsWith;
if (expirationDate == null) {
throw new InvalidArgumentException("null expiration date");
}
this.expirationDate = expirationDate;
}
/**
* Sets content type.
*/
public void setContentType(String contentType) throws InvalidArgumentException {
if (Strings.isNullOrEmpty(contentType)) {
throw new InvalidArgumentException("empty content type");
}
this.contentType = contentType;
}
/**
* Sets content encoding.
*/
public void setContentEncoding(String contentEncoding) throws InvalidArgumentException {
if (Strings.isNullOrEmpty(contentEncoding)) {
throw new InvalidArgumentException("empty content encoding");
}
this.contentEncoding = contentEncoding;
}
/**
* Sets content length.
*/
public void setContentLength(long contentLength) throws InvalidArgumentException {
if (contentLength <= 0) {
throw new InvalidArgumentException("negative content length");
}
this.setContentRange(contentLength, contentLength);
}
/**
* Sets content range.
*/
public void setContentRange(long startRange, long endRange) throws InvalidArgumentException {
if (startRange <= 0 || endRange <= 0) {
throw new InvalidArgumentException("negative start/end range");
}
if (startRange > endRange) {
throw new InvalidArgumentException("start range is higher than end range");
}
this.contentRangeStart = startRange;
this.contentRangeEnd = endRange;
}
/**
* Returns bucket name.
*/
public String bucketName() {
return this.bucketName;
}
private byte[] marshalJson(ArrayList<String[]> conditions) {
StringBuilder sb = new StringBuilder();
Joiner joiner = Joiner.on("\",\"");
sb.append("{");
if (expirationDate != null) {
sb.append("\"expiration\":" + "\"" + expirationDate.toString(DateFormat.EXPIRATION_DATE_FORMAT) + "\"");
}
if (!conditions.isEmpty()) {
sb.append(",\"conditions\":[");
ListIterator<String[]> iterator = conditions.listIterator();
while (iterator.hasNext()) {
sb.append("[\"" + joiner.join(iterator.next()) + "\"]");
if (iterator.hasNext()) {
sb.append(",");
}
}
sb.append("]");
}
sb.append("}");
return sb.toString().getBytes(StandardCharsets.UTF_8);
}
/**
* Returns form data of this post policy setting the provided region.
*/
public Map<String,String> formData(String accessKey, String secretKey, String region)
throws NoSuchAlgorithmException, InvalidKeyException, InvalidArgumentException {
if (Strings.isNullOrEmpty(region)) {
throw new InvalidArgumentException("empty region");
}
return makeFormData(accessKey, secretKey, region);
}
protected Map<String,String> makeFormData(String accessKey, String secretKey, String region)
throws NoSuchAlgorithmException, InvalidKeyException {
ArrayList<String[]> conditions = new ArrayList<>();
Map<String, String> formData = new HashMap<>();
conditions.add(new String[]{"eq", "$bucket", this.bucketName});
formData.put("bucket", this.bucketName);
if (this.startsWith) {
conditions.add(new String[]{"starts-with", "$key", this.objectName});
formData.put("key", this.objectName);
} else {
conditions.add(new String[]{"eq", "$key", this.objectName});
formData.put("key", this.objectName);
}
if (this.contentType != null) {
conditions.add(new String[]{"eq", "$Content-Type", this.contentType});
formData.put("Content-Type", this.contentType);
}
if (this.contentEncoding != null) {
conditions.add(new String[]{"eq", "$Content-Encoding", this.contentEncoding});
formData.put("Content-Encoding", this.contentEncoding);
}
if (this.contentRangeStart > 0 && this.contentRangeEnd > 0) {
conditions.add(new String[]{"content-length-range", Long.toString(this.contentRangeStart),
Long.toString(this.contentRangeEnd)});
}
conditions.add(new String[]{"eq", "$x-amz-algorithm", ALGORITHM});
formData.put("x-amz-algorithm", ALGORITHM);
DateTime date = new DateTime();
String credential = Signer.credential(accessKey, date, region);
conditions.add(new String[]{"eq", "$x-amz-credential", credential});
formData.put("x-amz-credential", credential);
String amzDate = date.toString(DateFormat.AMZ_DATE_FORMAT);
conditions.add(new String[]{"eq","$x-amz-date", amzDate});
formData.put("x-amz-date", amzDate);
String policybase64 = BaseEncoding.base64().encode(this.marshalJson(conditions));
String signature = Signer.postPresignV4(policybase64, secretKey, date, region);
formData.put("policy", policybase64);
formData.put("x-amz-signature", signature);
return formData;
}
}