implement IMAP extension COMPRESS=DEFLATE, rfc 4978

to compress the entire IMAP connection. tested with thunderbird, meli, k9, ios
mail. the initial implementation had interoperability issues with some of these
clients: if they write the deflate stream and flush in "partial mode", the go
stdlib flate reader does not return any data (until there is an explicit
zero-length "sync flush" block, or until the history/sliding window is full),
blocking progress, resulting in clients closing the seemingly stuck connection
after considering the connection timed out. this includes a coy of the flate
package with a new reader that returns partially flushed blocks earlier.

this also adds imap trace logging to imapclient.Conn, which was useful for
debugging.
This commit is contained in:
Mechiel Lukkien
2025-02-20 19:33:09 +01:00
parent 3f6c45a41f
commit f40f94670e
25 changed files with 3623 additions and 69 deletions

3
vendor/modules.txt vendored
View File

@ -19,6 +19,9 @@ github.com/mjl-/autocert
# github.com/mjl-/bstore v0.0.6
## explicit; go 1.19
github.com/mjl-/bstore
# github.com/mjl-/flate v0.0.0-20250221133712-6372d09eb978
## explicit; go 1.21
github.com/mjl-/flate
# github.com/mjl-/sconf v0.0.7
## explicit; go 1.12
github.com/mjl-/sconf