NotaBot/module_twitch.lua at master · DigitalPulseSoftware/NotaBot · GitHub

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-- This file is part of the "Not a Bot" application

-- For conditions of distribution and use, see copyright notice in LICENSE

local client = Client

local config = Config

local discordia = Discordia

local bot = Bot

local enums = discordia.enums

local wrap = coroutine.wrap

Module.Name = "twitch"

Module.GameCache = {}

Module.ProfileCache = {}

discordia.extensions()

local httpCodec = require('http-codec')

local net = require('coro-net')

local json = require('json')

local sha256 = require('sha256')

local querystring = require('querystring')

local timer = require("timer")

local twitchAPI = require('./twitchapi.lua')

local function tablesearchstr(tab, val)

for k,v in pairs(tab) do

if (tostring(v) == val) then

return true

end

return false

end

function Module:GetConfigTable()

return {

{

Name = "TwitchConfig",

Description = "List of watched channels with title patterns for messages to post on channel goes up",

Type = bot.ConfigType.Custom,

Default = {},

ValidateConfig = function (value)

if (type(value) ~= "table" or #value ~= 0) then

return false, "TwitchConfig must be an object"

end

for channelId, notificationData in pairs(value) do

if (not util.ValidateSnowflake(channelId)) then

return false, "TwitchConfig keys must be channel snowflakes"

end

if (type(notificationData) ~= "table" or #notificationData ~= table.count(notificationData)) then

return false, "TwitchConfig[" .. channelId .. "] must be an array"

end

for i, channelData in pairs(notificationData) do

local hasChannel = false

local hasMessage = false

for fieldName, fieldValue in pairs(channelData) do

if (fieldName == "AllowedGames") then

if (type(fieldValue) ~= "table" or #fieldValue ~= table.count(fieldValue)) then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be an array"

end

for i, value in pairs(fieldValue) do

if (type(value) ~= "number" or math.floor(value) ~= value) then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. "[" .. i .. "] is not an integer"

end

elseif (fieldName == "Channel") then

if (not util.ValidateSnowflake(fieldValue)) then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be a channel snowflake"

end

hasChannel = true

elseif (fieldName == "Message") then

if (type(fieldValue) ~= "string") then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be a string"

end

hasMessage = true

elseif (fieldName == "TitlePattern") then

if type(fieldValue) == "table" and #fieldValue == table.count(fieldValue) then

for j, value in pairs(fieldValue) do

if type(value) ~= "string" then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. "[" .. j .. "] is not a string"

end

elseif type(fieldValue) ~= "string" then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be a string or a table of string"

end

elseif (fieldName == "ShouldCreateDiscordEvent") then

if (type(fieldValue) ~= "boolean") then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be a boolean"

end

elseif (fieldName == "CreateDiscordEventDuration") then

if (type(fieldValue) ~= "number") then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " must be a number"

end

else

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "]." .. fieldName .. " is not a valid field"

end

if (not hasChannel) then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "] is lacking a Channel field"

end

if (not hasMessage) then

return false, "TwitchConfig[" .. channelId .. "][" .. i .. "] is lacking a Message field"

end

return true

end

{

Global = true,

Name = "CallbackEndpoint",

Description = "URI which will be sent to Twitch for channel events",

Type = bot.ConfigType.String,

Default = ""

{

Global = true,

Name = "ListenPort",

Description = "Port on which internal server listens",

Type = bot.ConfigType.Integer,

Default = 14793

{

Global = true,

Name = "SilenceDuration",

Description = "Duration during which a stream won't trigger other notifications after a notification",

Type = bot.ConfigType.Duration,

Default = 30 * 60

{

Global = true,

Name = "TwitchClientId",

Description = "Twitch application client id",

Type = bot.ConfigType.String,

Default = "",

Sensitive = true

{

Global = true,

Name = "TwitchClientSecret",

Description = "Twitch application secret",

Type = bot.ConfigType.String,

Default = "",

Sensitive = true

}

end

function Module:GetWatchedChannels()

local persistentData = self:GetPersistentData(nil)

persistentData.watchedChannels = persistentData.watchedChannels or {}

return persistentData.watchedChannels

end

function Module:OnLoaded()

self.API = twitchAPI(discordia, client, self.GlobalConfig.TwitchClientId, self.GlobalConfig.TwitchClientSecret)

local secretLifespan = 24 * 60 * 60

self.ChannelAlerts = {}

for channelId, channelData in pairs(self:GetWatchedChannels()) do

channelData.WaitingForConfirm = false

end

self.Clock = discordia.Clock()

self.Clock:on("sec", function ()

local watchedChannels = self:GetWatchedChannels()

local now = os.time()

for channelId, channelData in pairs(watchedChannels) do

if (channelData.RenewTime <= now and not channelData.Subscribed) then

local channelAlerts = self.ChannelAlerts[channelId]

if (channelAlerts and not table.empty(channelAlerts)) then

channelData.RenewTime = now + 30 -- Retry in 30 seconds if twitch didn't answer or subscribing failed

wrap(function () bot:CallModuleFunction(self, "SubscribeToTwitch", channelId) end)()

else

watchedChannels[channelId] = nil

self.ChannelAlerts[channelId] = nil

end

end)

self.Server = self:SetupServer()

if (not self.Server) then

return false, "Failed to setup server"

end

self.Clock:start()

self:RegisterCommand({

Name = "twitchinfo",

Args = {

{Name = "channel", Type = Bot.ConfigType.String}

PrivilegeCheck = function (member) return member:hasPermission(enums.permission.administrator) end,

Help = "Query twitch informations about a channel",

Func = function (commandMessage, channel)

local profileData, err

if (channel:match("^%d+$")) then

profileData, err = self.API:GetUserById(channel)

else

profileData, err = self.API:GetUserByName(channel)

end

if (profileData) then

local channelUrl = "https://www.twitch.tv/" .. profileData.login

commandMessage:reply({

embed = {

title = profileData.display_name,

description = profileData.description,

url = channelUrl,

author = {

name = profileData.login,

url = channelUrl,

icon_url = profileData.profile_image_url

thumbnail = {

url = profileData.profile_image_url

fields = {

{

name = "View count",

value = profileData.view_count

{

name = "Type",

value = #profileData.broadcaster_type > 0 and profileData.broadcaster_type or "regular"

}

image = {

url = profileData.offline_image_url

footer = {

text = "ID: " .. profileData.id

}

})

else

if (err) then

commandMessage:reply(string.format("An error occurred: %s", err))

else

commandMessage:reply(string.format("Profile `%s` not found", channel))

end

})

self:RegisterCommand({

Name = "twitchgameinfo",

Args = {

{Name = "channel", Type = Bot.ConfigType.String}

PrivilegeCheck = function (member) return member:hasPermission(enums.permission.administrator) end,

Help = "Query twitch informations about a game",

Func = function (commandMessage, channel)

local gameData, err

if (channel:match("^%d+$")) then

gameData, err = self.API:GetGameById(channel)

else

gameData, err = self.API:GetGameByName(channel)

end

if (gameData) then

local thumbnail = gameData.box_art_url

thumbnail = thumbnail:gsub("{width}", 285)

thumbnail = thumbnail:gsub("{height}", 380)

commandMessage:reply({

embed = {

title = gameData.name,

image = {

url = thumbnail

footer = {

text = "ID: " .. gameData.id

}

})

else

if (err) then

commandMessage:reply(string.format("An error occurred: %s", err))

else

commandMessage:reply(string.format("Game `%s` not found", channel))

end

})

self:RegisterCommand({

Name = "twitchstream",

Args = {

{Name = "channel", Type = Bot.ConfigType.String}

PrivilegeCheck = function (member) return member:hasPermission(enums.permission.administrator) end,

Help = "Query twitch informations about a ongoing stream",

Func = function (commandMessage, channel)

local channelData, err

if (channel:match("^%d+$")) then

channelData, err = self.API:GetStreamByUserId(channel)

else

channelData, err = self.API:GetStreamByUserName(channel)

end

if (channelData) then

bot:CallModuleFunction(self, "SendChannelNotification", commandMessage.guild, commandMessage.channel, "", channelData)

else

if (err) then

commandMessage:reply(string.format("An error occurred: %s", err))

else

commandMessage:reply(string.format("Stream `%s` not found", channel))

end

})

return true

end

function Module:OnEnable(guild)

local config = self:GetConfig(guild)

self:HandleConfig(guild, config)

return true

end

function Module:HandleConfig(guild, config)

local watchedChannels = self:GetWatchedChannels()

-- Remove all alerts for this guild before reapplying them

for channelId, channelAlerts in pairs(self.ChannelAlerts) do

channelAlerts[guild.id] = nil

end

for channelId,channelData in pairs(config.TwitchConfig) do

local watchedData = watchedChannels[channelId]

if (not watchedData) then

watchedData = {

LastAlert = 0,

RenewTime = os.time(),

Subscribed = false,

WaitingForConfirm = false

}

watchedChannels[channelId] = watchedData

end

local channelAlerts = self.ChannelAlerts[channelId]

if (not channelAlerts) then

channelAlerts = {}

self.ChannelAlerts[channelId] = channelAlerts

end

channelAlerts[guild.id] = channelData

end

function Module:HandleConfigUpdate(guild, config, configName)

if (not configName or configName == "TwitchConfig") then

self:HandleConfig(guild, config)

end

function Module:OnDisable(guild)

local config = self:GetConfig(guild)

for channelId,channelData in pairs(config.TwitchConfig) do

local channelAlerts = self.ChannelAlerts[channelId]

if (channelAlerts) then

channelAlerts[guild.id] = nil

end

function Module:OnUnload()

if (self.Clock) then

self.Clock:stop()

end

self.Server:close()

end

function Module:CreateServer(host, port, onConnect)

return net.createServer({

host = host,

port = port,

encoder = httpCodec.encoder,

decoder = httpCodec.decoder,

}, function (read, write, socket)

for head in read do

local parts = {}

for part in read do

if #part > 0 then

parts[#parts + 1] = part

else

break

end

local body = table.concat(parts)

local head, body = onConnect(head, body, socket)

write(head)

if body then write(body) end

write("")

if not head.keepAlive then break end

end

write() --FIXME: This should be done by coro-net

end)

end

local charset = {} do -- [0-9a-zA-Z]

for c = 48, 57 do table.insert(charset, string.char(c)) end

for c = 65, 90 do table.insert(charset, string.char(c)) end

for c = 97, 122 do table.insert(charset, string.char(c)) end

end

function Module:GenerateSecret(length)

local res = ""

for i = 1, length do

res = res .. charset[math.random(1, #charset)]

end

return res

end

function Module:SetupServer()

return self:CreateServer("127.0.0.1", self.GlobalConfig.ListenPort, function (head, body, socket)

local Forbidden = function()

self:LogWarning("Twitch server: Access forbidden")

local header = {

code = 403,

{"Content-Type", "charset=utf-8"},

{"Content-Length", 0}

}

return header, ""

end

local Ok = function ()

local header = {

code = 200,

reason = "OK",

{"Content-Type", "charset=utf-8"},

{"Content-Length", 0}

}

return header, ""

end

local ServerError = function ()

self:LogWarning("Twitch server: Server error")

local header = {

code = 500,

{"Content-Type", "charset=utf-8"},

{"Content-Length", 0}

}

return header, ""

end

-- Check signature

local headers = {}

for _, keyvalue in ipairs(head) do

local key, value = unpack(keyvalue)

headers[key:lower()] = value

end

local messageType = headers["twitch-eventsub-message-type"]

local headerSignature = headers["twitch-eventsub-message-signature"]

local subscriptionType = headers["twitch-eventsub-subscription-type"]

-- Check signature to ensure it's coming from twitch

if (not messageType) then

self:LogError("Twitch Server: no message type")

return Forbidden()

end

if (not headerSignature) then

self:LogError("Twitch Server: no message signature")

return Forbidden()

end

-- Check hash

local hash, hashValue = string.match(headerSignature, "(%w+)=(%w+)")

if (not hash or not hashValue or hash ~= "sha256") then

self:LogError("Twitch server: Invalid header signature %s", headerSignature)

return Forbidden()

end

local payload = json.decode(body)

-- Retrieve user id from subscription data

local userId = assert(payload.subscription.condition.broadcaster_user_id)

local watchedChannels = self:GetWatchedChannels()

local channelData = watchedChannels[userId]

if (not channelData) then

self:LogError("%s is not a watched channel, ignoring...", userId)

return Forbidden()

end

local hmacMessage = assert(headers["twitch-eventsub-message-id"])

.. assert(headers["twitch-eventsub-message-timestamp"])

.. body

assert(channelData.Secret)

local signature = sha256.hmac_sha256(channelData.Secret, hmacMessage)

if (hashValue ~= signature) then

self:LogError("Hash doesn't match")

return Forbidden()

end

-- Okay message is from Twitch, handle it

if (messageType == "notification") then

self:LogInfo("Twitch server: Received %s notification for channel %s", subscriptionType, userId)

coroutine.wrap(function()

bot:CallModuleFunction(self, "HandleChannelNotification", userId, channelData, subscriptionType, payload.event)

end)()

elseif (messageType == "webhook_callback_verification") then

self:LogInfo("Twitch server: Subscribed to %s for channel %s", subscriptionType, userId)

if (not channelData.WaitingForConfirm) then

self:LogError("Twitch server: Channel \"%s\" is not waiting for Twitch confirmation", tostring(userId))

return Forbidden()

end

channelData.Subscribed = true

channelData.WaitingForConfirm = false

local challenge = payload.challenge

local header = {

code = 200,

{"Content-Type", "charset=utf-8"},

{"Content-Length", #challenge}

}

return header, challenge

elseif (messageType == "revocation") then

self:LogInfo("Twitch server: Unsubscribed from %s for channel %s", subscriptionType, channelId)

channelData.RenewTime = os.time()

channelData.Subscribed = false

channelData.WaitingForConfirm = false

channelData.ChannelUpEventId = nil

else

self:LogError("Twitch server: Unknown messageType %s", messageType)

return ServerError()

end

return Ok()

end)

end

function Module:HandleChannelNotification(channelId, channelData, type, eventData)

if (type == "stream.online") then

local channelAlerts = self.ChannelAlerts[channelId]

if (not channelAlerts) then

self:LogError("%s has no active alerts, ignoring...", channelId)

return

end

local now = os.time()

if (now - channelData.LastAlert < self.GlobalConfig.SilenceDuration) then

self:LogInfo("Dismissed alert event because last one occured %s ago", util.FormatTime(now - channelData.LastAlert))

return

end

local startDate = discordia.Date.parseISO(eventData.started_at)

if (channelData.LastAlert > startDate) then

self:LogInfo("Dismissed alert event because last one occured while the stream was active (%s ago)", util.FormatTime(now - channelData.LastAlert))

return

end

-- There may be a race condition between Twitch notifying a stream started and stream info fetching, try multiple times with a small delay

local streamData, err

for i=1,10 do

self:LogInfo("trying to retrieve stream info for %s (attempt %d/10)", channelId, i)

streamData, err = self.API:GetStreamByUserId(channelId)

if (streamData) then

break

else

if (err) then

self:LogError("couldn't retrieve stream info for %s: %s", channelId, err.msg)

end

timer.sleep(1000)

end

if (not streamData) then

return

end

channelData.LastAlert = now

local title = streamData.title

local gameId = streamData.game_id

for guildId, guildPatterns in pairs(channelAlerts) do

local guild = client:getGuild(guildId)

if (guild) then

local function CheckPattern(pattern)

if pattern.TitlePattern then

local doesMatch = false

for _, titlePattern in ipairs(table.wrap(pattern.TitlePattern)) do

if title:match(titlePattern) then

doesMatch = true

break

end

if not doesMatch then

return false

end

if (pattern.AllowedGames) then

if (not tablesearchstr(pattern.AllowedGames, gameId)) then

return false

end

elseif (pattern.ForbiddenGames) then

if (tablesearchstr(pattern.ForbiddenGames, gameId)) then

return false

end

return true

end

for _, pattern in pairs(guildPatterns) do

if (CheckPattern(pattern)) then

local channel = guild:getChannel(pattern.Channel)

if (channel) then

bot:CallModuleFunction(self, "SendChannelNotification", guild, channel, pattern.Message, streamData)

if (pattern.ShouldCreateDiscordEvent) then

bot:CallModuleFunction(self, "CreateScheduledEvent", guild, channelId, title, pattern.CreateDiscordEventDuration or 3600)

end

else

self:LogError(guild, "Channel %s doesn't exist", pattern.Channel)

end

break

end

else

self:LogWarning("unexpected event %s for channel %s", type, channelId)

end

function Module:CreateScheduledEvent(guild, channelId, title, duration)

local profileData, err = self:GetProfileData(channelId)

if (not profileData) then

self:LogError("failed to query user %s info: %s", channelData.user_id, err.msg)

return

end

local eventTitle = "🎬 Stream: " .. title

if #eventTitle > 100 then

eventTitle = eventTitle:sub(1, 97) .. "..."

end

local now = os.time()

-- TODO: Add support for images

local eventData = {

entity_type = enums.scheduledEventsEntityTypes.external,

entity_metadata = {

location = "https://twitch.tv/" .. profileData.Name

name = eventTitle,

description = profileData.Name .. " is currently streaming!",

privacy_level = enums.scheduledEventsPrivacyLevel.guild_only,

scheduled_start_time = os.date("!%Y-%m-%dT%TZ", now + 5),

scheduled_end_time = os.date("!%Y-%m-%dT%TZ", now + duration),

}

local success, err = guild:createScheduledEvents(eventData)

if not success then

self:LogError(guild, "failed to create scheduled event")

end

function Module:GetProfileData(userId)

local now = os.time()

local profileData = self.ProfileCache[userId]

if (not profileData or now - profileData.CachedAt > 3600) then

local userInfo, err = self.API:GetUserById(userId)

if (err) then

return nil, err

end

profileData = {}

if (userInfo) then

profileData.CachedAt = now

profileData.DisplayName = userInfo.display_name

profileData.Name = userInfo.login

profileData.Image = userInfo.profile_image_url

end

self.ProfileCache[userId] = profileData

end

return profileData

end

function Module:GetGameData(gameId)

local now = os.time()

local gameData = self.GameCache[gameId]

if (not gameData or now - gameData.CachedAt > 3600) then

local gameInfo, err = self.API:GetGameById(gameId)

if (err) then

return nil, err

end

gameData = {}

if (gameInfo) then

gameData.CachedAt = now

gameData.Id = gameInfo.id

gameData.Image = gameInfo.box_art_url

gameData.Name = gameInfo.name

end

self.GameCache[gameId] = gameData

end

return gameData

end

function Module:SendChannelNotification(guild, channel, message, channelData)

local profileData, err = self:GetProfileData(channelData.user_id)

if (not profileData) then

self:LogError("Failed to query user %s info: %s", channelData.user_id, err.msg)

return

end

local gameData, err = self:GetGameData(channelData.game_id)

if (not gameData) then

self:LogError("Failed to query game info about game %s: %s", channelData.game_id, err.msg)

end

local nonMentionableRoles = {}

for roleId in message:gmatch("<@&(%d+)>") do

local role = guild:getRole(roleId)

if (role) then

if (not role.mentionable) then

nonMentionableRoles[roleId] = role

end

else

self:LogWarning(guild, "Role %s doesn't exist", roleId)

end

local gameName = gameData and gameData.Name or string.format("<game %s>", channelData.game_id)

message = message:gsub("{([%w_]+)}", {

display_name = profileData.DisplayName,

game_name = gameName,

title = channelData.title

})

local channelUrl = "https://www.twitch.tv/" .. profileData.Name

local thumbnail = channelData.thumbnail_url .. "?" .. os.time() -- Bypass Discord image caching

thumbnail = thumbnail:gsub("{width}", 320)

thumbnail = thumbnail:gsub("{height}", 180)

for roleId, role in pairs(nonMentionableRoles) do

local success, err = role:enableMentioning()

if (not success) then

self:LogWarning(guild, "Failed to enable mentioning on role %s (%s): %s", roleId, role.name, err)

end

local fields = {nil, nil, nil}

if (gameData) then

table.insert(fields, {

name = "Game",

value = gameName

})

end

if (channelData.viewer_count > 0) then

table.insert(fields, {

name = "Viewers",

value = channelData.viewer_count

})

end

local now = os.time()

local startDate = discordia.Date.parseISO(channelData.started_at)

table.insert(fields, {

name = "Started",

value = util.DiscordRelativeTimestamp(startDate)

})

local success, err = channel:send({

content = message,

embed = {

title = channelData.title,

url = channelUrl,

author = {

name = profileData.Name,

url = channelUrl,

icon_url = profileData.Image

thumbnail = {

url = profileData.Image

fields = fields,

image = {

url = thumbnail

timestamp = channelData.started_at

}

})

if (not success) then

self:LogError(guild, "Failed to send twitch notification message: %s", err)

end

for roleId, role in pairs(nonMentionableRoles) do

local success, err = role:disableMentioning()

if (not success) then

self:LogWarning(guild, "Failed to re-disable mentioning on role %s (%s): %s", roleId, role.name, err)

end

function Module:SubscribeToTwitch(channelId)

self:LogInfo("Subscribing to channel %s", channelId)

local watchedChannels = self:GetWatchedChannels()

local channelData = watchedChannels[channelId]

assert(channelData)

if (channelData.ChannelUpEventId) then

self:UnsubscribeFromTwitch(channelId)

end

channelData.WaitingForConfirm = true

channelData.Secret = self:GenerateSecret(32)

local succeeded, ret, err = pcall(function () return self.API:SubscribeToStreamUp(channelId, self.GlobalConfig.CallbackEndpoint, channelData.Secret) end)

if (not succeeded or not ret) then

channelData.WaitingForConfirm = false

if (err.code == 409) then -- conflict, this subscription already exists

self:LogInfo("subscription already exist")

-- Try to remove subscription

local subscriptions, err = self.API:ListSubscriptions()

if (not subscriptions) then

self:LogError("failed to list current subscriptions: %s", err.msg)

return false, err.msg

end

for _, subscription in pairs(subscriptions.data) do

if (subscription.condition.broadcaster_user_id == channelId) then

self.API:Unsubscribe(subscription.id)

break

end

-- Try again

return

end

self:LogError("An error occurred: %s", err.msg)

return false, err.msg

end

channelData.ChannelUpEventId = ret.data.id

return ret, err

end

function Module:UnsubscribeFromTwitch(channelId)

local channelData = watchedChannels[channelId]

if (channelData and channelData.ChannelUpEventId) then

self:LogInfo("Unsubscribing from channel %s", channelId)

return self.API:Unsubscribe(channelData.ChannelUpEventId)

end

NotaBot/module_twitch.lua at master · DigitalPulseSoftware/NotaBot · GitHub

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