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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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go.sum
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@ -30,6 +30,8 @@ github.com/mjl-/autocert v0.0.0-20231214125928-31b7400acb05 h1:s6ay4bh4tmpPLdxjy
github.com/mjl-/autocert v0.0.0-20231214125928-31b7400acb05/go.mod h1:taMFU86abMxKLPV4Bynhv8enbYmS67b8LG80qZv2Qus=
github.com/mjl-/bstore v0.0.6 h1:ntlu9MkfCkpm2XfBY4+Ws4KK9YzXzewr3+lCueFB+9c=
github.com/mjl-/bstore v0.0.6/go.mod h1:/cD25FNBaDfvL/plFRxI3Ba3E+wcB0XVOS8nJDqndg0=
github.com/mjl-/flate v0.0.0-20250221133712-6372d09eb978 h1:Eg5DfI3/00URzGErujKus6a3O0kyXzF8vjoDZzH/gig=
github.com/mjl-/flate v0.0.0-20250221133712-6372d09eb978/go.mod h1:QBkFtjai3AiQQuUu7pVh6PA06Vd3oa68E+vddf/UBOs=
github.com/mjl-/sconf v0.0.7 h1:bdBcSFZCDFMm/UdBsgNCsjkYmKrSgYwp7rAOoufwHe4=
github.com/mjl-/sconf v0.0.7/go.mod h1:uF8OdWtLT8La3i4ln176i1pB0ps9pXGCaABEU55ZkE0=
github.com/mjl-/sherpa v0.6.7 h1:C5F8XQdV5nCuS4fvB+ye/ziUQrajEhOoj/t2w5T14BY=