2 commits

Author	SHA1	Message	Date
Mechiel Lukkien	28fae96a9b	make mox compile on windows, without "mox serve" but with working "mox localserve" ... getting mox to compile required changing code in only a few places where package "syscall" was used: for accessing file access times and for umask handling. an open problem is how to start a process as an unprivileged user on windows. that's why "mox serve" isn't implemented yet. and just finding a way to implement it now may not be good enough in the near future: we may want to starting using a more complete privilege separation approach, with a process handling sensitive tasks (handling private keys, authentication), where we may want to pass file descriptors between processes. how would that work on windows? anyway, getting mox to compile for windows doesn't mean it works properly on windows. the largest issue: mox would normally open a file, rename or remove it, and finally close it. this happens during message delivery. that doesn't work on windows, the rename/remove would fail because the file is still open. so this commit swaps many "remove" and "close" calls. renames are a longer story: message delivery had two ways to deliver: with "consuming" the (temporary) message file (which would rename it to its final destination), and without consuming (by hardlinking the file, falling back to copying). the last delivery to a recipient of a message (and the only one in the common case of a single recipient) would consume the message, and the earlier recipients would not. during delivery, the already open message file was used, to parse the message. we still want to use that open message file, and the caller now stays responsible for closing it, but we no longer try to rename (consume) the file. we always hardlink (or copy) during delivery (this works on windows), and the caller is responsible for closing and removing (in that order) the original temporary file. this does cost one syscall more. but it makes the delivery code (responsibilities) a bit simpler. there is one more obvious issue: the file system path separator. mox already used the "filepath" package to join paths in many places, but not everywhere. and it still used strings with slashes for local file access. with this commit, the code now uses filepath.FromSlash for path strings with slashes, uses "filepath" in a few more places where it previously didn't. also switches from "filepath" to regular "path" package when handling mailbox names in a few places, because those always use forward slashes, regardless of local file system conventions. windows can handle forward slashes when opening files, so test code that passes path strings with forward slashes straight to go stdlib file i/o functions are left unchanged to reduce code churn. the regular non-test code, or test code that uses path strings in places other than standard i/o functions, does have the paths converted for consistent paths (otherwise we would end up with paths with mixed forward/backward slashes in log messages). windows cannot dup a listening socket. for "mox localserve", it isn't important, and we can work around the issue. the current approach for "mox serve" (forking a process and passing file descriptors of listening sockets on "privileged" ports) won't work on windows. perhaps it isn't needed on windows, and any user can listen on "privileged" ports? that would be welcome. on windows, os.Open cannot open a directory, so we cannot call Sync on it after message delivery. a cursory internet search indicates that directories cannot be synced on windows. the story is probably much more nuanced than that, with long deep technical details/discussions/disagreement/confusion, like on unix. for "mox localserve" we can get away with making syncdir a no-op.	2023-10-14 10:54:07 +02:00
Mechiel Lukkien	3fb41ff073	implement message threading in backend and webmail ... we match messages to their parents based on the "references" and "in-reply-to" headers (requiring the same base subject), and in absense of those headers we also by only base subject (against messages received max 4 weeks ago). we store a threadid with messages. all messages in a thread have the same threadid. messages also have a "thread parent ids", which holds all id's of parent messages up to the thread root. then there is "thread missing link", which is set when a referenced immediate parent wasn't found (but possibly earlier ancestors can still be found and will be in thread parent ids". threads can be muted: newly delivered messages are automatically marked as read/seen. threads can be marked as collapsed: if set, the webmail collapses the thread to a single item in the basic threading view (default is to expand threads). the muted and collapsed fields are copied from their parent on message delivery. the threading is implemented in the webmail. the non-threading mode still works as before. the new default threading mode "unread" automatically expands only the threads with at least one unread (not seen) meessage. the basic threading mode "on" expands all threads except when explicitly collapsed (as saved in the thread collapsed field). new shortcuts for navigation/interaction threads have been added, e.g. go to previous/next thread root, toggle collapse/expand of thread (or double click), toggle mute of thread. some previous shortcuts have changed, see the help for details. the message threading are added with an explicit account upgrade step, automatically started when an account is opened. the upgrade is done in the background because it will take too long for large mailboxes to block account operations. the upgrade takes two steps: 1. updating all message records in the database to add a normalized message-id and thread base subject (with "re:", "fwd:" and several other schemes stripped). 2. going through all messages in the database again, reading the "references" and "in-reply-to" headers from disk, and matching against their parents. this second step is also done at the end of each import of mbox/maildir mailboxes. new deliveries are matched immediately against other existing messages, currently no attempt is made to rematch previously delivered messages (which could be useful for related messages being delivered out of order). the threading is not yet exposed over imap.	2023-09-13 15:44:57 +02:00