Previously, the user name and password were being transmitted as IMAP (RFC
3501) quoted strings.
The problem is that quoted strings are only permitted to carry 7-bit
(ASCII) data, whereas user names and passwords entered in K-9 Mail may not
be ASCII, so K-9 was violating the RFC by sending them as quoted strings.
The solution is to transmit the credentials as IMAP literal strings, which
are permitted for user names and passwords, and which permit the
transmission of 8-bit data.
This is only a partial attempt for fixing the LOGIN command for users with
non-ASCII credentials. The problem is that IMAP permits 8-bit data for
user names and passwords (if transmitted as literals), but the RFC says
nothing about the character encoding for 8-bit data. This commit encodes
them as UTF-8.
The RFC author's comments on the subject:
http://mailman2.u.washington.edu/pipermail/imap-protocol/2008-February/000822.html
Ideally, users should avoid the LOGIN command and use the SASL PLAIN
mechanism (within TLS) which explicitly permits UTF-8. (K-9 Mail always
chooses PLAIN over LOGIN, when PLAIN is available.)
CRAM-MD5 (RFC 2195) permits 8-bit data but does not identify its encoding.
Since ASCII does not permit 8-bit data, this commit changes the encoding
to UTF-8.
There is an expired Internet-Draft that proposed that the RFC be changed
to explicitly require UTF-8 encoding of user names and shared secrets.
(But then there's also an expired draft proposing that CRAM-MD5 be retired
to historic status.)
Instead of CRAM-MD5, a better option for users is the SASL PLAIN mechanism
(within TLS) which explicitly permits UTF-8.
See Issue 4492
This method made way too many assumptions about server responses and
should not have been attempting to read and parse them. That should be
left to ImapResponseParser.
Changes:
Implement the PLAIN SASL mechanism. IMAPv4rev1 assures its availability
so long as the connection is encrypted. The big advantage of PLAIN over
IMAP "LOGIN" is that PLAIN uses UTF-8 encoding for the user name and
password, whereas "LOGIN" is only safe for 7-bit US-ASCII -- the encoding
of 8-bit data is undefined.
(Note that RFC 6855 says that IMAP "LOGIN" does not support UTF-8, and
clients must use IMAP "AUTHENTICATE" to pass UTF-8 user names and
passwords.)
Honor the "LOGINDISABLED" CAPABILITY (RFC 2595) when the server declares
it. There's no sense transmitting a password in the clear when it is
known that it will be rejected.
No attempt is made to try CRAM-MD5 if the server doesn't profess to
support it in its CAPABILITY response. (This is the same behavior as
Thunderbird.)
Extract code from ImapConnection.open into new method
ImapConnection.login.
Extract code from ImapConnection.executeSimpleCommand into new method
ImapConnection.readStatusResponse.
Related issues: 6015, 6016
All \r and \n codes have been replaced with <br />, so the patterns in
these replacements don't match anything.
This problem has existed for some time -- since commits 1ea27d7 and
e12dd32.
No attempt is made here to reimplement the replacements because users are
now used to the current behavior without much apparent complaint, and such
replacements are never perfect and can occasionally fail to work as
desired without additional tweaking for special cases.
There's currently a bug in linkifyText() that can lead to a
StringIndexOutOfBoundsException when the text contains a
bitcoin URI and a "web" URI near the end of the text.
The loop extracted keys from `folderMap` and then called
`folderMap.get(...)` for every key. If both the key and the value needs
to be iterated on, `Map.entrySet()` is a more efficient solution as it
doesn't require O(n) Map lookups.
Since id is a Long, Long.valueOf(long) unboxed the Long to a primitive
long, then reboxed it into a Long instance, which was again unboxed to
allow it to be set as an element of the array of longs. This commit
reduces the number of boxings from 3 to 1.
Under certain circumstances it's possible that the 'push state' isn't
updated to contain the most recent 'UIDNEXT' value. In that case
ImapFolderPusher.start() would execute the same code path through its
main loop over and over again, preventing the device from going to
sleep.
Rather than changing the code to update the 'push state' in the corner
case that triggers the behavior described above, this commit introduces
another mechanism to track the 'UIDNEXT' value. This should also catch
as of yet unknown cases where the 'push state' isn't properly updated.
At some point in the future I hope we get to a point where we only
persist the 'push state' when we manually stop/restart the service.
During normal operation there's no need to read from/write to storage
all the time.
Fixes issue 4907
When message viewing and tap the next icon, menu icons (previous, next, delete and replys) disappears for an instant.
But a compose icon remains, then tap it accidentally.
