Motivation:
HTTP is a plaintext protocol which means that someone may be able
to eavesdrop the data. To prevent this, HTTPS should be used whenever
possible. However, maintaining using https:// in all URLs may be
difficult. The nohttp tool can help here. The tool scans all the files
in a repository and reports where http:// is used.
Modifications:
- Added nohttp (via checkstyle) into the build process.
- Suppressed findings for the websites
that don't support HTTPS or that are not reachable
Result:
- Prevent using HTTP in the future.
- Encourage users to use HTTPS when they follow the links they found in
the code.
Motivation:
AUTH command is used to login to a SMTP server.
EMPTY command is for request with only parameter.
Modifications:
Add AUTH & EMPTY to SmtpCommand & SmtpRequests
Update SmtpRequestEncoder#writeParameters, handle SP according to
command
Add unit test
Result:
fix#9995
Motivation:
SmtpRequestEncoderTest#testThrowsIfContentExpected has a ByteBuf leak.
Modifications:
- SmtpRequestEncoderTest#testThrowsIfContentExpected should release buffers in a finally block
Result:
No more leaks in SmtpRequestEncoderTest#testThrowsIfContentExpected.
Motivation:
- A `hashCode` of the SmtpCommand is recalculated on each call of `hashCode()`. Cached hash code value can be just replaced with call of `name.hashCode()`.
- The commands cache don't work for strings: `SmtpCommand.valueOf("HELO")` returns a new instance.
- Field `contentExpected` is redundant and can be replaced with `equals(DATA)`.
Modifications:
- Use the `name.hashCode()` as hash code result.
- Fix a command cache: use strings as map keys.
- Replace field `contentExpected` to using `this.equals(DATA)`.
- Add unit tests.
Result:
More correct and clean code.
Motivation:
If the remote server returns an invalid response in the form "000 \r\n"
(i.e. a three digit code, then space, but no details), null is added
as a singletonList to the response being constructed.
This seems unexpected and it would be easier to handle an empty
details list in client code.
Modifications:
If detail is null (because frame.isReadable() returned false after
reading the separator), initialise DefaultSmtpResponse with an empty
list instead of a list containing a single null value.
Result:
When encountering this malformed server response, a DefaultSmtpResponse
with a code but no details will be created.
Motivation:
If the remote server returns a 4xx/5xx error in response to
a DATA command (or earlier command if using pipelining),
SmtpRequestEncoder can become stuck in an invalid state,
not allowing any requests to be sent.
This makes the channel unusable and the connection has to be closed,
or the encoder handler has to be replaced.
Modifications:
If a RSET command is written to the channel, the contentExpected
flag is set to false, and the RSET is written to the channel.
Result:
Sending a RSET command after a server 4xx/5xx error will make it
possible to use the current connection for new mail transactions.
Motivation:
When writing a SMTP client a provided SMTP codec that follows RFC2821 is useful.
Modification:
Add client side codec and test.
Results:
People who want to write a SMTP client can reuse the codec.
