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implement IMAP extension COMPRESS=DEFLATE, rfc 4978

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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
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3
go.mod
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@ -6,6 +6,7 @@ require (
github.com/mjl-/adns v0.0.0-20240509092456-2dc8715bf4af
github.com/mjl-/autocert v0.0.0-20231214125928-31b7400acb05
github.com/mjl-/bstore v0.0.6
github.com/mjl-/flate v0.0.0-20250221133712-6372d09eb978
github.com/mjl-/sconf v0.0.7
github.com/mjl-/sherpa v0.6.7
github.com/mjl-/sherpadoc v0.0.16
@ -17,6 +18,7 @@ require (
golang.org/x/crypto v0.32.0
golang.org/x/exp v0.0.0-20240416160154-fe59bbe5cc7f
golang.org/x/net v0.34.0
golang.org/x/sys v0.29.0
golang.org/x/text v0.21.0
rsc.io/qr v0.2.0
)
@ -31,7 +33,6 @@ require (
github.com/prometheus/procfs v0.12.0 // indirect
golang.org/x/mod v0.22.0 // indirect
golang.org/x/sync v0.10.0 // indirect
golang.org/x/sys v0.29.0 // indirect
golang.org/x/tools v0.29.0 // indirect
google.golang.org/protobuf v1.31.0 // indirect
)