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reactions.lua
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reactions.lua
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--[[
mattata v2.0 - Reactions Plugin
Tracks karma via message reactions (thumbs up/down).
Records message authorship so reaction events can attribute karma.
]]
local session = require('src.core.session')
local plugin = {}
plugin.name = 'reactions'
plugin.category = 'fun'
plugin.description = 'Reaction-based karma tracking'
plugin.commands = { 'reactions' }
plugin.help = '/reactions <on|off> - Toggle reaction karma tracking for this group.'
plugin.group_only = true
plugin.admin_only = true
local THUMBS_UP = '\xF0\x9F\x91\x8D'
local THUMBS_DOWN = '\xF0\x9F\x91\x8E'
function plugin.on_message(api, message, ctx)
if not message.args or message.args == '' then
-- Show current status
local enabled = session.get_cached_setting(message.chat.id, 'reactions_enabled', function()
local result = ctx.db.call('sp_get_chat_setting', { message.chat.id, 'reactions_enabled' })
if result and #result > 0 then
return result[1].value
end
return nil
end)
local status = (enabled == 'true') and 'enabled' or 'disabled'
return api.send_message(message.chat.id,
string.format('Reaction karma is currently <b>%s</b> for this group.\nUse <code>/reactions on</code> or <code>/reactions off</code> to toggle.', status),
{ parse_mode = 'html' }
)
end
local arg = message.args:lower()
if arg == 'on' or arg == 'enable' then
local ok, _ = pcall(ctx.db.call, 'sp_upsert_chat_setting', { message.chat.id, 'reactions_enabled', 'true' })
if not ok then
return api.send_message(message.chat.id, 'Failed to update setting. Please try again.')
end
session.invalidate_setting(message.chat.id, 'reactions_enabled')
return api.send_message(message.chat.id, 'Reaction karma has been enabled for this group.')
elseif arg == 'off' or arg == 'disable' then
local ok, _ = pcall(ctx.db.call, 'sp_upsert_chat_setting', { message.chat.id, 'reactions_enabled', 'false' })
if not ok then
return api.send_message(message.chat.id, 'Failed to update setting. Please try again.')
end
session.invalidate_setting(message.chat.id, 'reactions_enabled')
else
return api.send_message(message.chat.id, 'Usage: /reactions <on|off>')
end
end
-- Record message authorship for karma attribution
function plugin.on_new_message(api, message, ctx)
if not ctx.is_group or not message.from then return end
-- Only track authorship if reactions feature is enabled for this chat
local enabled = session.get_cached_setting(message.chat.id, 'reactions_enabled', function()
local ok, result = pcall(ctx.db.call, 'sp_get_chat_setting', { message.chat.id, 'reactions_enabled' })
if ok and result and #result > 0 then
return result[1].value
end
return nil
end)
if enabled ~= 'true' then return end
ctx.redis.setex(
string.format('msg_author:%s:%s', message.chat.id, message.message_id),
172800,
tostring(message.from.id)
)
end
-- Build a set of emoji strings from a reaction array
local function reaction_set(reactions)
local set = {}
if not reactions then return set end
for _, r in ipairs(reactions) do
if r.type == 'emoji' and r.emoji then
set[r.emoji] = true
end
end
return set
end
function plugin.on_reaction(api, update, ctx)
-- Anonymous reactions cannot be tracked
if not update.user then return end
if not update.chat then return end
local chat_id = update.chat.id
-- Check if reactions_enabled for this chat
local enabled = session.get_cached_setting(chat_id, 'reactions_enabled', function()
local ok, result = pcall(ctx.db.call, 'sp_get_chat_setting', { chat_id, 'reactions_enabled' })
if ok and result and #result > 0 then
return result[1].value
end
return nil
end)
if enabled ~= 'true' then return end
-- Look up the author of the reacted message
local author_id = ctx.redis.get(
string.format('msg_author:%s:%s', chat_id, update.message_id)
)
if not author_id then return end
author_id = tonumber(author_id)
-- Prevent self-karma
if update.user.id == author_id then return end
local new_set = reaction_set(update.new_reaction)
local old_set = reaction_set(update.old_reaction)
local karma_key = 'karma:' .. author_id
local delta = 0
-- New reactions that weren't in old (added)
for emoji, _ in pairs(new_set) do
if not old_set[emoji] then
if emoji == THUMBS_UP then
delta = delta + 1
elseif emoji == THUMBS_DOWN then
delta = delta - 1
end
end
end
-- Old reactions that aren't in new (removed)
for emoji, _ in pairs(old_set) do
if not new_set[emoji] then
if emoji == THUMBS_UP then
delta = delta - 1
elseif emoji == THUMBS_DOWN then
delta = delta + 1
end
end
end
if delta ~= 0 then
ctx.redis.incrby(karma_key, delta)
end
end
return plugin

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