Mercurial > prosody-modules
annotate mod_mam/fallback_archive.lib.lua @ 3656:3e0f4d727825
mod_vcard_muc: Add an alternative method of signaling avatar change
When the avatar has been changed, a signal is sent that the room
configuration has changed. Clients then do a disco#info query to find
the SHA-1 of the new avatar. They can then fetch it as before, or not if
they have it cached already.
This is meant to be less disruptive than signaling via presence, which
caused problems for some clients.
If clients transition to the new method, the old one can eventually be removed.
The namespace is made up while waiting for standardization.
Otherwise it is very close to what's described in
https://xmpp.org/extensions/inbox/muc-avatars.html
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 25 Aug 2019 20:46:43 +0200 |
parents | 03f6d9ed2903 |
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rev | line source |
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2023
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1 -- luacheck: ignore 212/self |
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2 |
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3 local uuid = require "util.uuid".generate; |
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4 local store = module:shared("archive"); |
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5 local archive_store = { _provided_by = "mam"; name = "fallback"; }; |
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6 |
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7 function archive_store:append(username, key, value, when, with) |
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8 local archive = store[username]; |
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9 if not archive then |
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10 archive = { [0] = 0 }; |
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11 store[username] = archive; |
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12 end |
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13 local index = (archive[0] or #archive)+1; |
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14 local item = { key = key, when = when, with = with, value = value }; |
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15 if not key or archive[key] then |
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16 key = uuid(); |
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17 item.key = key; |
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18 end |
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19 archive[index] = item; |
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20 archive[key] = index; |
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21 archive[0] = index; |
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22 return key; |
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23 end |
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24 |
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25 function archive_store:find(username, query) |
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26 local archive = store[username] or {}; |
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27 local start, stop, step = 1, archive[0] or #archive, 1; |
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28 local qstart, qend, qwith = -math.huge, math.huge; |
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29 local limit; |
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30 |
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31 if query then |
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32 if query.reverse then |
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33 start, stop, step = stop, start, -1; |
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34 if query.before and archive[query.before] then |
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35 start = archive[query.before] - 1; |
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36 end |
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37 elseif query.after and archive[query.after] then |
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38 start = archive[query.after] + 1; |
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39 end |
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40 qwith = query.with; |
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41 limit = query.limit; |
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42 qstart = query.start or qstart; |
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43 qend = query["end"] or qend; |
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44 end |
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45 |
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46 return function () |
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47 if limit and limit <= 0 then return end |
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48 for i = start, stop, step do |
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49 local item = archive[i]; |
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50 if (not qwith or qwith == item.with) and item.when >= qstart and item.when <= qend then |
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51 if limit then limit = limit - 1; end |
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52 start = i + step; -- Start on next item |
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53 return item.key, item.value, item.when, item.with; |
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54 end |
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55 end |
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56 end |
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57 end |
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58 |
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59 function archive_store:delete(username, query) |
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60 if not query or next(query) == nil then |
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61 -- no specifics, delete everything |
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62 store[username] = nil; |
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63 return true; |
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64 end |
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65 local archive = store[username]; |
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66 if not archive then return true; end -- no messages, nothing to delete |
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67 |
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68 local qstart = query.start or -math.huge; |
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69 local qend = query["end"] or math.huge; |
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70 local qwith = query.with; |
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71 store[username] = nil; |
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72 for i = 1, #archive do |
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73 local item = archive[i]; |
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74 local when, with = item.when, item.when; |
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75 -- Add things that don't match the query |
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76 if not ((not qwith or qwith == item.with) and item.when >= qstart and item.when <= qend) then |
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77 self:append(username, item.key, item.value, when, with); |
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78 end |
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79 end |
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80 return true; |
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81 end |
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82 |
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83 return archive_store; |