Github user grkvlt commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/357#discussion_r21098987
--- Diff:
software/network/src/main/java/brooklyn/entity/network/bind/BindDnsServerImpl.java
---
@@ -73,6 +74,23 @@
private static final Logger LOG =
LoggerFactory.getLogger(BindDnsServerImpl.class);
+ // As per RFC 952 and RFC 1123.
+ private static final CharMatcher DOMAIN_NAME_FIRST_CHAR_MATCHER =
CharMatcher.inRange('a', 'z')
+ .or(CharMatcher.inRange('A', 'Z'))
+ .or(CharMatcher.inRange('0', '9'));
+ private static final CharMatcher DOMAIN_NAME_MATCHER =
DOMAIN_NAME_FIRST_CHAR_MATCHER
+ .or(CharMatcher.is('-'));
+
+
+ private class HostnameTransformer implements Function<Entity, String> {
+ @Override
+ public String apply(Entity input) {
+ String hostname =
input.getAttribute(getConfig(HOSTNAME_SENSOR));
+ hostname =
DOMAIN_NAME_FIRST_CHAR_MATCHER.negate().trimFrom(hostname);
+ return DOMAIN_NAME_MATCHER.retainFrom(hostname);
--- End diff --
```
hostname =
DOMAIN_NAME_FIRST_CHAR_MATCHER.negate().trimLeadingFrom(hostname);
return DOMAIN_NAME_MATCHER.negate().trimAndCollapseFrom(hostname, '-');
```
This would be better, it only removes disallowed characters from the start,
and replaces anything else disallowed in the body of the string with `-`.
There's length restrictions too, 63 characters per segment and 255
characters overall maximum.
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