-- Prosody IM -- Copyright (C) 2008-2017 Matthew Wild -- Copyright (C) 2008-2017 Waqas Hussain -- Copyright (C) 2011-2017 Kim Alvefur -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- -- XEP-0313: Message Archive Management for Prosody -- local xmlns_mam = "urn:xmpp:mam:2"; local xmlns_delay = "urn:xmpp:delay"; local xmlns_forward = "urn:xmpp:forward:0"; local xmlns_st_id = "urn:xmpp:sid:0"; local um = require "core.usermanager"; local st = require "util.stanza"; local rsm = require "util.rsm"; local get_prefs = module:require"mamprefs".get; local set_prefs = module:require"mamprefs".set; local prefs_to_stanza = module:require"mamprefsxml".tostanza; local prefs_from_stanza = module:require"mamprefsxml".fromstanza; local jid_bare = require "util.jid".bare; local jid_split = require "util.jid".split; local jid_prepped_split = require "util.jid".prepped_split; local dataform = require "util.dataforms".new; local host = module.host; local rm_load_roster = require "core.rostermanager".load_roster; local is_stanza = st.is_stanza; local tostring = tostring; local time_now = os.time; local m_min = math.min; local timestamp, timestamp_parse = require "util.datetime".datetime, require "util.datetime".parse; local default_max_items, max_max_items = 20, module:get_option_number("max_archive_query_results", 50); local strip_tags = module:get_option_set("dont_archive_namespaces", { "http://jabber.org/protocol/chatstates" }); local archive_store = module:get_option_string("archive_store", "archive"); local archive = module:open_store(archive_store, "archive"); if archive.name == "null" or not archive.find then if not archive.find then module:log("debug", "Attempt to open archive storage returned a valid driver but it does not seem to implement the storage API"); module:log("debug", "mod_%s does not support archiving", archive._provided_by or archive.name and "storage_"..archive.name.."(?)" or "<unknown>"); else module:log("debug", "Attempt to open archive storage returned null driver"); end module:log("debug", "See https://prosody.im/doc/storage and https://prosody.im/doc/archiving for more information"); module:log("info", "Using in-memory fallback archive driver"); archive = module:require "fallback_archive"; end local use_total = true; local cleanup; local function schedule_cleanup(username) if cleanup and not cleanup[username] then table.insert(cleanup, username); cleanup[username] = true; end end -- Handle prefs. module:hook("iq/self/"..xmlns_mam..":prefs", function(event) local origin, stanza = event.origin, event.stanza; local user = origin.username; if stanza.attr.type == "set" then local new_prefs = stanza:get_child("prefs", xmlns_mam); local prefs = prefs_from_stanza(new_prefs); local ok, err = set_prefs(user, prefs); if not ok then origin.send(st.error_reply(stanza, "cancel", "internal-server-error", "Error storing preferences: "..tostring(err))); return true; end end local prefs = prefs_to_stanza(get_prefs(user)); local reply = st.reply(stanza):add_child(prefs); origin.send(reply); return true; end); local query_form = dataform { { name = "FORM_TYPE"; type = "hidden"; value = xmlns_mam; }; { name = "with"; type = "jid-single"; }; { name = "start"; type = "text-single" }; { name = "end"; type = "text-single"; }; }; -- Serve form module:hook("iq-get/self/"..xmlns_mam..":query", function(event) local origin, stanza = event.origin, event.stanza; origin.send(st.reply(stanza):query(xmlns_mam):add_child(query_form:form())); return true; end); -- Handle archive queries module:hook("iq-set/self/"..xmlns_mam..":query", function(event) local origin, stanza = event.origin, event.stanza; local query = stanza.tags[1]; local qid = query.attr.queryid; schedule_cleanup(origin.username); -- Search query parameters local qwith, qstart, qend; local form = query:get_child("x", "jabber:x:data"); if form then local err; form, err = query_form:data(form); if err then origin.send(st.error_reply(stanza, "modify", "bad-request", select(2, next(err)))); return true; end qwith, qstart, qend = form["with"], form["start"], form["end"]; qwith = qwith and jid_bare(qwith); -- dataforms does jidprep end if qstart or qend then -- Validate timestamps local vstart, vend = (qstart and timestamp_parse(qstart)), (qend and timestamp_parse(qend)); if (qstart and not vstart) or (qend and not vend) then origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid timestamp")) return true; end qstart, qend = vstart, vend; end module:log("debug", "Archive query, id %s with %s from %s until %s)", tostring(qid), qwith or "anyone", qstart and timestamp(qstart) or "the dawn of time", qend and timestamp(qend) or "now"); -- RSM stuff local qset = rsm.get(query); local qmax = m_min(qset and qset.max or default_max_items, max_max_items); local reverse = qset and qset.before or false; local before, after = qset and qset.before, qset and qset.after; if type(before) ~= "string" then before = nil; end -- Load all the data! local data, err = archive:find(origin.username, { start = qstart; ["end"] = qend; -- Time range with = qwith; limit = qmax + 1; before = before; after = after; reverse = reverse; total = use_total or qmax == 0; }); if not data then origin.send(st.error_reply(stanza, "cancel", "internal-server-error", err)); return true; end local total = tonumber(err); local msg_reply_attr = { to = stanza.attr.from, from = stanza.attr.to }; local results = {}; -- Wrap it in stuff and deliver local first, last; local count = 0; local complete = "true"; for id, item, when in data do count = count + 1; if count > qmax then complete = nil; break; end local fwd_st = st.message(msg_reply_attr) :tag("result", { xmlns = xmlns_mam, queryid = qid, id = id }) :tag("forwarded", { xmlns = xmlns_forward }) :tag("delay", { xmlns = xmlns_delay, stamp = timestamp(when) }):up(); if not is_stanza(item) then item = st.deserialize(item); end item.attr.xmlns = "jabber:client"; fwd_st:add_child(item); if not first then first = id; end last = id; if reverse then results[count] = fwd_st; else origin.send(fwd_st); end end if reverse then for i = #results, 1, -1 do origin.send(results[i]); end first, last = last, first; end -- That's all folks! module:log("debug", "Archive query %s completed", tostring(qid)); origin.send(st.reply(stanza) :tag("fin", { xmlns = xmlns_mam, queryid = qid, complete = complete }) :add_child(rsm.generate { first = first, last = last, count = total })); return true; end); local function has_in_roster(user, who) local roster = rm_load_roster(user, host); module:log("debug", "%s has %s in roster? %s", user, who, roster[who] and "yes" or "no"); return roster[who]; end local function shall_store(user, who) -- TODO Cache this? if not um.user_exists(user, host) then return false; end local prefs = get_prefs(user); local rule = prefs[who]; module:log("debug", "%s's rule for %s is %s", user, who, tostring(rule)); if rule ~= nil then return rule; end -- Below could be done by a metatable local default = prefs[false]; module:log("debug", "%s's default rule is %s", user, tostring(default)); if default == "roster" then return has_in_roster(user, who); end return default; end local function strip_stanza_id(stanza, user) if stanza:get_child("stanza-id", xmlns_st_id) then stanza = st.clone(stanza); stanza:maptags(function (tag) if tag.name == "stanza-id" and tag.attr.xmlns == xmlns_st_id then local by_user, by_host, res = jid_prepped_split(tag.attr.by); if not res and by_host == host and by_user == user then return nil; end end return tag; end); end return stanza; end -- Handle messages local function message_handler(event, c2s) local origin, stanza = event.origin, event.stanza; local log = c2s and origin.log or module._log; local orig_type = stanza.attr.type or "normal"; local orig_from = stanza.attr.from; local orig_to = stanza.attr.to or orig_from; -- Stanza without 'to' are treated as if it was to their own bare jid -- Whos storage do we put it in? local store_user = c2s and origin.username or jid_split(orig_to); -- And who are they chatting with? local with = jid_bare(c2s and orig_to or orig_from); -- Filter out <stanza-id> that claim to be from us event.stanza = strip_stanza_id(stanza, store_user); -- We store chat messages or normal messages that have a body if not(orig_type == "chat" or (orig_type == "normal" and stanza:get_child("body")) ) then log("debug", "Not archiving stanza: %s (type)", stanza:top_tag()); return; end -- or if hints suggest we shouldn't if not stanza:get_child("store", "urn:xmpp:hints") then -- No hint telling us we should store if stanza:get_child("no-permanent-store", "urn:xmpp:hints") or stanza:get_child("no-store", "urn:xmpp:hints") then -- Hint telling us we should NOT store log("debug", "Not archiving stanza: %s (hint)", stanza:top_tag()); return; end end local clone_for_storage; if not strip_tags:empty() then clone_for_storage = st.clone(stanza); clone_for_storage:maptags(function (tag) if strip_tags:contains(tag.attr.xmlns) then return nil; else return tag; end end); if #clone_for_storage.tags == 0 then log("debug", "Not archiving stanza: %s (empty when stripped)", stanza:top_tag()); return; end else clone_for_storage = stanza; end -- Check with the users preferences if shall_store(store_user, with) then log("debug", "Archiving stanza: %s", stanza:top_tag()); -- And stash it local ok = archive:append(store_user, nil, clone_for_storage, time_now(), with); if ok then local clone_for_other_handlers = st.clone(stanza); local id = ok; clone_for_other_handlers:tag("stanza-id", { xmlns = xmlns_st_id, by = store_user.."@"..host, id = id }):up(); event.stanza = clone_for_other_handlers; schedule_cleanup(store_user); module:fire_event("archive-message-added", { origin = origin, stanza = clone_for_storage, for_user = store_user, id = id }); end else log("debug", "Not archiving stanza: %s (prefs)", stanza:top_tag()); end end local function c2s_message_handler(event) return message_handler(event, true); end -- Filter out <stanza-id> before the message leaves the server to prevent privacy leak. local function strip_stanza_id_after_other_events(event) event.stanza = strip_stanza_id(event.stanza, event.origin.username); end module:hook("pre-message/bare", strip_stanza_id_after_other_events, -1); module:hook("pre-message/full", strip_stanza_id_after_other_events, -1); local cleanup_after = module:get_option_string("archive_expires_after", "1w"); local cleanup_interval = module:get_option_number("archive_cleanup_interval", 4 * 60 * 60); if not archive.delete then module:log("debug", "Selected storage driver does not support deletion, archives will not expire"); elseif cleanup_after ~= "never" then local day = 86400; local multipliers = { d = day, w = day * 7, m = 31 * day, y = 365.2425 * day }; local n, m = cleanup_after:lower():match("(%d+)%s*([dwmy]?)"); if not n then module:log("error", "Could not parse archive_expires_after string %q", cleanup_after); return false; end cleanup_after = tonumber(n) * ( multipliers[m] or 1 ); module:log("debug", "archive_expires_after = %d -- in seconds", cleanup_after); if not archive.delete then module:log("error", "archive_expires_after set but mod_%s does not support deleting", archive._provided_by); return false; end -- Set of known users to do message expiry for -- Populated either below or when new messages are added cleanup = {}; -- Iterating over users is not supported by all authentication modules -- Catch and ignore error if not supported pcall(function () -- If this works, then we schedule cleanup for all known users on startup for user in um.users(module.host) do schedule_cleanup(user); end end); -- At odd intervals, delete old messages for one user module:add_timer(math.random(10, 60), function() local user = table.remove(cleanup, 1); if user then module:log("debug", "Removing old messages for user %q", user); local ok, err = archive:delete(user, { ["end"] = os.time() - cleanup_after; }) if not ok then module:log("warn", "Could not expire archives for user %s: %s", user, err); elseif type(ok) == "number" then module:log("debug", "Removed %d messages", ok); end cleanup[user] = nil; end return math.random(cleanup_interval, cleanup_interval * 2); end); else -- Don't ask the backend to count the potentially unbounded number of items, -- it'll get slow. use_total = false; end -- Stanzas sent by local clients module:hook("pre-message/bare", c2s_message_handler, 0); module:hook("pre-message/full", c2s_message_handler, 0); -- Stanzas to local clients module:hook("message/bare", message_handler, 0); module:hook("message/full", message_handler, 0); module:hook("account-disco-info", function(event) (event.reply or event.stanza):tag("feature", {var=xmlns_mam}):up(); (event.reply or event.stanza):tag("feature", {var=xmlns_st_id}):up(); end);