private Url decryptUrl(final Request request, final Url encryptedUrl) {
if (encryptedUrl.getSegments().isEmpty()) {
return encryptedUrl;
}
final List<String> encryptedSegments = (List<String>) encryptedUrl.getSegments();
if (encryptedSegments.size() < 1) {
return null;
}
Url url = new Url(request.getCharset());
try {
final String encryptedUrlString = (String) encryptedSegments.get(0);
if (Strings.isEmpty((CharSequence) encryptedUrlString)) {
return null;
}
final String decryptedUrl = this.getCrypt().decryptUrlSafe(encryptedUrlString);
if (decryptedUrl == null) {
return null;
}
final Url originalUrl = Url.parse(decryptedUrl, request.getCharset());
final int originalNumberOfSegments = originalUrl.getSegments().size();
final int encryptedNumberOfSegments = encryptedUrl.getSegments().size();
final HashedSegmentGenerator generator = new HashedSegmentGenerator(encryptedUrlString);
int segNo;
for (segNo = 1; segNo < encryptedNumberOfSegments; ++segNo) {
if (segNo > originalNumberOfSegments) {
break;
}
final String next = generator.next();
final String encryptedSegment = (String) encryptedSegments.get(segNo);
if (!next.equals(encryptedSegment)) {
break;
}
url.getSegments().add(originalUrl.getSegments().get(segNo - 1));
}
while (segNo < encryptedNumberOfSegments) {
url.getSegments().add(encryptedUrl.getSegments().get(segNo));
++segNo;
}
url.getQueryParameters().addAll(originalUrl.getQueryParameters());
} catch (Exception e) {
CryptoMapper.log.error("Error decrypting URL", e);
url = null;
}
return url;
}
private Url encryptUrl(final Url url) {
if (url.getSegments().isEmpty() && url.getQueryParameters().isEmpty()) {
return url;
}
final String encryptedUrlString = this.getCrypt().encryptUrlSafe(url.toString());
final Url encryptedUrl = new Url(url.getCharset());
encryptedUrl.getSegments().add(encryptedUrlString);
final int numberOfSegments = url.getSegments().size();
final HashedSegmentGenerator generator = new HashedSegmentGenerator(encryptedUrlString);
for (int segNo = 0; segNo < numberOfSegments; ++segNo) {
encryptedUrl.getSegments().add(generator.next());
}
return encryptedUrl;
}