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Create signature.java (#64)

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Java example for creating signature
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josepowera 2018-09-06 13:35:00 +02:00 committed by Sergey Alexandrovich
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commit 96249406f4
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package imgproxytest;
import com.amazonaws.util.Base16;
import org.apache.commons.codec.binary.Base64;
import org.junit.Assert;
import org.junit.Test;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public class imgproxy {
@Test
public void testWithJavaHmacApacheBase64ImgProxyTest() throws Exception {
String Key = "943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881";
String Salt = "520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5";
String Url = "http://img.example.com/pretty/image.jpg";
String Resize = "fill";
int Width = 300;
int Height = 300;
String Gravity = "no";
int Enlarge = 1;
String Extension = "png";
String urlWithHash = GenerateSignedUrlImgProxy(Key, Salt, Url, Resize, Width, Height, Gravity, Enlarge, Extension);
Assert.assertEquals("/_PQ4ytCQMMp-1w1m_vP6g8Qb-Q7yF9mwghf6PddqxLw/fill/300/300/no/1/aHR0cDovL2ltZy5leGFtcGxlLmNvbS9wcmV0dHkvaW1hZ2UuanBn.png", urlWithHash);
}
public static String GenerateSignedUrlImgProxy(String key, String salt, String url, String resize, int width, int height, String gravity, int enlarge, String extension) throws Exception {
final String HMACSHA256 = "HmacSHA256";
byte[] keybin = Base16.decode(key);
byte[] saltBin = Base16.decode(salt);
String encodedUrl = Base64.encodeBase64URLSafeString(url.getBytes());
String path = "/" + resize + "/" + width + "/" + height + "/" + gravity + "/" + enlarge + "/" + encodedUrl + "." + extension;
Mac sha256_HMAC = Mac.getInstance(HMACSHA256);
SecretKeySpec secret_key = new SecretKeySpec(keybin, HMACSHA256);
sha256_HMAC.init(secret_key);
sha256_HMAC.update(saltBin);
String hash = Base64.encodeBase64URLSafeString(sha256_HMAC.doFinal(path.getBytes()));
return "/" + hash + path;
}
}