private String getPayload() {
Map<String, Object> payload =
ImmutableMap.<String, Object>of(
"articleId", data.getArticleId(),
"checksum", buildChecksum(),
"collectionMeta", buildCollectionMetaToken());
return LivefyreUtil.mapToJsonString(payload);
}
/**
* Generates a MD5-encrypted checksum based on this collection's attributes.
*
* @return String.
*/
public String buildChecksum() {
try {
Map<String, Object> attr = data.asMap();
byte[] digest =
MessageDigest.getInstance("MD5").digest(LivefyreUtil.mapToJsonString(attr).getBytes());
return printHexBinary(digest);
} catch (NoSuchAlgorithmException e) {
throw new LivefyreException("MD5 message digest missing. This shouldn't ever happen." + e);
}
}