/**
* Calculates and sets {@link Payload#setContentMD5} on the payload.
*
* <p>note that this will rebuffer in memory if the payload is not repeatable.
*
* @param payload payload to calculate
* @return new Payload with md5 set.
* @throws IOException
*/
public static Payload calculateMD5(Payload payload) throws IOException {
checkNotNull(payload, "payload");
if (!payload.isRepeatable()) {
MutableContentMetadata oldContentMetadata = payload.getContentMetadata();
Payload oldPayload = payload;
try {
payload = newByteArrayPayload(toByteArray(payload));
} finally {
oldPayload.release();
}
oldContentMetadata.setContentLength(payload.getContentMetadata().getContentLength());
oldContentMetadata.setContentMD5(payload.getContentMetadata().getContentMD5());
payload.setContentMetadata(oldContentMetadata);
}
payload
.getContentMetadata()
.setContentMD5(asByteSource(payload.getInput()).hash(md5()).asBytes());
return payload;
}
