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Mikubot-2/otouto/utilities.lua
2016-09-08 01:35:10 +02:00

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--[[
utilities.lua
Functions shared among otouto plugins.
Copyright 2016 topkecleon <drew@otou.to>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License version 3 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
]]--
local utilities = {}
utf8 = require('lua-utf8')
ltn12 = require('ltn12')
http = require('socket.http')
https = require('ssl.https')
socket = require('socket')
URL = require('socket.url')
json = require("dkjson")
pcall(json.use_lpeg)
serpent = require("serpent")
redis = (loadfile "./otouto/redis.lua")()
mime = (loadfile "./otouto/mimetype.lua")()
OAuth = require "OAuth"
helpers = require "OAuth.helpers"
http.TIMEOUT = 7
https.TIMEOUT = 7
-- For the sake of ease to new contributors and familiarity to old contributors,
-- we'll provide a couple of aliases to real bindings here.
function utilities.send_message(chat_id, text, disable_web_page_preview, reply_to_message_id, use_markdown, reply_markup)
local parse_mode
if type(use_markdown) == 'string' then
parse_mode = use_markdown
elseif use_markdown == true then
parse_mode = 'markdown'
end
return bindings.request(
'sendMessage',
{
chat_id = chat_id,
text = text,
disable_web_page_preview = disable_web_page_preview,
reply_to_message_id = reply_to_message_id,
parse_mode = parse_mode,
reply_markup = reply_markup
}
)
end
-- https://core.telegram.org/bots/api#editmessagetext
function utilities.edit_message(chat_id, message_id, text, disable_web_page_preview, use_markdown, reply_markup)
local parse_mode
if type(use_markdown) == 'string' then
parse_mode = use_markdown
elseif use_markdown == true then
parse_mode = 'Markdown'
end
return bindings.request(
'editMessageText',
{
chat_id = chat_id,
message_id = message_id,
text = text,
disable_web_page_preview = disable_web_page_preview,
parse_mode = parse_mode,
reply_markup = reply_markup
}
)
end
function utilities.delete_message(chat_id, message_id)
return utilities.edit_message(chat_id, message_id, '<i>Gelöschte Nachricht</i>', true, 'HTML')
end
function utilities.send_reply(msg, text, use_markdown, reply_markup)
local parse_mode
if type(use_markdown) == 'string' then
parse_mode = use_markdown
elseif use_markdown == true then
parse_mode = 'markdown'
end
return bindings.request(
'sendMessage',
{
chat_id = msg.chat.id,
text = text,
disable_web_page_preview = true,
reply_to_message_id = msg.message_id,
parse_mode = parse_mode,
reply_markup = reply_markup
}
)
end
-- NOTE: Telegram currently only allows file uploads up to 50 MB
-- https://core.telegram.org/bots/api#sendphoto
function utilities.send_photo(chat_id, file, text, reply_to_message_id, reply_markup)
if not file then return false end
local output = bindings.request(
'sendPhoto',
{
chat_id = chat_id,
caption = text or nil,
reply_to_message_id = reply_to_message_id,
reply_markup = reply_markup
},
{
photo = file
}
)
if string.match(file, '/tmp/') then
os.remove(file)
print("Deleted: "..file)
end
return output
end
-- https://core.telegram.org/bots/api#sendaudio
function utilities.send_audio(chat_id, file, reply_to_message_id, duration, performer, title)
if not file then return false end
local output = bindings.request(
'sendAudio',
{
chat_id = chat_id,
duration = duration or nil,
performer = performer or nil,
title = title or nil,
reply_to_message_id = reply_to_message_id
},
{
audio = file
}
)
if string.match(file, '/tmp/') then
os.remove(file)
print("Deleted: "..file)
end
return output
end
-- https://core.telegram.org/bots/api#senddocument
function utilities.send_document(chat_id, file, text, reply_to_message_id, reply_markup)
if not file then return false end
local output = bindings.request(
'sendDocument',
{
chat_id = chat_id,
caption = text or nil,
reply_to_message_id = reply_to_message_id,
reply_markup = reply_markup
},
{
document = file
}
)
if string.match(file, '/tmp/') then
os.remove(file)
print("Deleted: "..file)
end
return output
end
-- https://core.telegram.org/bots/api#sendvideo
function utilities.send_video(chat_id, file, text, reply_to_message_id, duration, width, height)
if not file then return false end
local output = bindings.request(
'sendVideo',
{
chat_id = chat_id,
caption = text or nil,
duration = duration or nil,
width = width or nil,
height = height or nil,
reply_to_message_id = reply_to_message_id
},
{
video = file
}
)
if string.match(file, '/tmp/') then
os.remove(file)
print("Deleted: "..file)
end
return output
end
-- NOTE: Voice messages are .ogg files encoded with OPUS
-- https://core.telegram.org/bots/api#sendvoice
function utilities.send_voice(chat_id, file, reply_to_message_id, duration)
if not file then return false end
local output = bindings.request(
'sendVoice',
{
chat_id = chat_id,
duration = duration or nil,
reply_to_message_id = reply_to_message_id
},
{
voice = file
}
)
if string.match(file, '/tmp/') then
os.remove(file)
print("Deleted: "..file)
end
return output
end
-- https://core.telegram.org/bots/api#sendlocation
function utilities.send_location(chat_id, latitude, longitude, reply_to_message_id)
return bindings.request(
'sendLocation',
{
chat_id = chat_id,
latitude = latitude,
longitude = longitude,
reply_to_message_id = reply_to_message_id
}
)
end
-- NOTE: Venue is different from location: it shows information, such as the street adress or
-- title of the location with it.
-- https://core.telegram.org/bots/api#sendvenue
function utilities.send_venue(chat_id, latitude, longitude, reply_to_message_id, title, address)
return bindings.request(
'sendVenue',
{
chat_id = chat_id,
latitude = latitude,
longitude = longitude,
title = title,
address = address,
reply_to_message_id = reply_to_message_id
}
)
end
-- https://core.telegram.org/bots/api#sendchataction
function utilities.send_typing(chat_id, action)
return bindings.request(
'sendChatAction',
{
chat_id = chat_id,
action = action
}
)
end
-- https://core.telegram.org/bots/api#answercallbackquery
function utilities.answer_callback_query(callback, text, show_alert)
return bindings.request(
'answerCallbackQuery',
{
callback_query_id = callback.id,
text = text,
show_alert = show_alert
}
)
end
-- https://core.telegram.org/bots/api#getchat
function utilities.get_chat_info(chat_id)
return bindings.request(
'getChat',
{
chat_id = chat_id
}
)
end
-- https://core.telegram.org/bots/api#getchatadministrators
function utilities.get_chat_administrators(chat_id)
return bindings.request(
'getChatAdministrators',
{
chat_id = chat_id
}
)
end
-- https://core.telegram.org/bots/api#answerinlinequery
function utilities.answer_inline_query(inline_query, results, cache_time, is_personal, next_offset, switch_pm_text, switch_pm_parameter)
return bindings.request(
'answerInlineQuery',
{
inline_query_id = inline_query.id,
results = results,
cache_time = cache_time,
is_personal = is_personal,
next_offset = next_offset,
switch_pm_text = switch_pm_text,
switch_pm_parameter = switch_pm_parameter
}
)
end
function abort_inline_query(inline_query)
return bindings.request(
'answerInlineQuery',
{
inline_query_id = inline_query.id,
cache_time = 5,
is_personal = true
}
)
end
-- get the indexed word in a string
function utilities.get_word(s, i)
s = s or ''
i = i or 1
local n = 0
for w in s:gmatch('%g+') do
n = n + 1
if n == i then return w end
end
return false
end
-- Returns the string after the first space.
function utilities.input(s)
if not s:find(' ') then
return false
end
return s:sub(s:find(' ')+1)
end
function utilities.input_from_msg(msg)
return utilities.input(msg.text) or (msg.reply_to_message and #msg.reply_to_message.text > 0 and msg.reply_to_message.text) or false
end
-- Trims whitespace from a string.
function utilities.trim(str)
local s = str:gsub('^%s*(.-)%s*$', '%1')
return s
end
-- Returns true if the string is blank/empty
function string:isempty()
self = self:trim()
return self == nil or self == ''
end
function get_name(msg)
local name = msg.from.first_name
if not name then
name = msg.from.id
end
return name
end
-- http://www.lua.org/manual/5.2/manual.html#pdf-io.popen
function run_command(str)
local cmd = io.popen(str)
local result = cmd:read('*all')
cmd:close()
return result
end
function convert_timestamp(timestamp, date_format)
return os.date(date_format, timestamp)
end
-- Saves file to $HOME/tmp/. If file_name isn't provided,
-- will get the text after the last "/" for filename
-- and content-type for extension
function download_to_file(url, file_name)
print('url to download: '..url)
if not file_name then
file_name = '/tmp/' .. url:match('.+/(.-)$') or '/tmp/' .. os.time()
else
file_name = '/tmp/' .. file_name
end
local body = {}
local doer = http
local do_redir = true
if url:match('^https') then
doer = https
do_redir = false
end
local _, res = doer.request{
url = url,
sink = ltn12.sink.table(body),
redirect = do_redir
}
if res ~= 200 then return false end
local file = io.open(file_name, 'w+')
file:write(table.concat(body))
file:close()
print('Saved to: '..file_name)
return file_name
end
function vardump(value)
print(serpent.block(value, {comment=false}))
end
-- Loads a JSON file as a table.
function utilities.load_data(filename)
local f = io.open(filename)
if f then
local s = f:read('*all')
f:close()
return json.decode(s)
else
return {}
end
end
-- Saves a table to a JSON file.
function utilities.save_data(filename, data)
local s = json.encode(data)
local f = io.open(filename, 'w')
f:write(s)
f:close()
end
-- Returns file size as Integer
-- See: https://www.lua.org/pil/21.3.html
function get_file_size(file)
local current = file:seek() -- get current position
local size = file:seek("end") -- get file size
file:seek("set", current) -- restore position
return tonumber(size)
end
-- Gets coordinates for a location. Used by gMaps.lua, time.lua, weather.lua.
function utilities.get_coords(input, config)
local url = 'https://maps.googleapis.com/maps/api/geocode/json?address='..URL.escape(input)..'&language=de'
local jstr, res = https.request(url)
if res ~= 200 then
return config.errors.connection
end
local jdat = json.decode(jstr)
if jdat.status == 'ZERO_RESULTS' then
return config.errors.results
end
return {
lat = jdat.results[1].geometry.location.lat,
lon = jdat.results[1].geometry.location.lng,
addr = jdat.results[1].formatted_address
}
end
-- Get the number of values in a key/value table.
function utilities.table_size(tab)
local i = 0
for _,_ in pairs(tab) do
i = i + 1
end
return i
end
-- Just an easy way to get a user's full name.
-- Alternatively, abuse it to concat two strings like I do.
function utilities.build_name(first, last)
if last then
return first .. ' ' .. last
else
return first
end
end
function utilities:handle_exception(err, message, log_chat)
local output = string.format(
'[%s]\n%s: %s\n%s\n',
os.date('%F %T'),
self.info.username,
err or '',
message
)
if log_chat then
output = '<code>' .. utilities.html_escape(output) .. '</code>'
return utilities.send_message(log_chat, output, true, nil, 'html')
else
print(output)
end
end
function utilities.md_escape(text)
return text:gsub('_', '\\_')
:gsub('%[', '\\['):gsub('%]', '\\]')
:gsub('%*', '\\*'):gsub('`', '\\`')
end
function utilities.html_escape(text)
return text:gsub('&', '&amp;'):gsub('<', '&lt;'):gsub('>', '&gt;')
end
utilities.triggers_meta = {}
utilities.triggers_meta.__index = utilities.triggers_meta
function utilities.triggers_meta:t(pattern, has_args)
local username = self.username:lower()
table.insert(self.table, '^'..self.cmd_pat..pattern..'$')
table.insert(self.table, '^'..self.cmd_pat..pattern..'@'..username..'$')
if has_args then
table.insert(self.table, '^'..self.cmd_pat..pattern..'%s+[^%s]*')
table.insert(self.table, '^'..self.cmd_pat..pattern..'@'..username..'%s+[^%s]*')
end
return self
end
function utilities.triggers(username, cmd_pat, trigger_table)
local self = setmetatable({}, utilities.triggers_meta)
self.username = username
self.cmd_pat = cmd_pat
self.table = trigger_table or {}
return self
end
function utilities.enrich_user(user)
user.id_str = tostring(user.id)
user.name = utilities.build_name(user.first_name, user.last_name)
return user
end
function utilities.enrich_message(msg)
if not msg.text then msg.text = msg.caption or '' end
msg.text_lower = msg.text:lower()
msg.from = utilities.enrich_user(msg.from)
msg.chat.id_str = tostring(msg.chat.id)
if msg.reply_to_message then
if not msg.reply_to_message.text then
msg.reply_to_message.text = msg.reply_to_message.caption or ''
end
msg.reply_to_message.text_lower = msg.reply_to_message.text:lower()
msg.reply_to_message.from = utilities.enrich_user(msg.reply_to_message.from)
msg.reply_to_message.chat.id_str = tostring(msg.reply_to_message.chat.id)
end
if msg.forward_from then
msg.forward_from = utilities.enrich_user(msg.forward_from)
end
if msg.new_chat_member then
msg.new_chat_member = utilities.enrich_user(msg.new_chat_member)
end
if msg.left_chat_member then
msg.left_chat_member = utilities.enrich_user(msg.left_chat_member)
end
return msg
end
function utilities.pretty_float(x)
if x % 1 == 0 then
return tostring(math.floor(x))
else
return tostring(x)
end
end
-- This table will store unsavory characters that are not properly displayed,
-- or are just not fun to type.
utilities.char = {
zwnj = '',
arabic = '[\216-\219][\128-\191]',
rtl_override = '',
rtl_mark = '',
em_dash = '',
utf_8 = '[%z\1-\127\194-\244][\128-\191]',
}
-- taken from http://stackoverflow.com/a/11130774/3163199
function scandir(directory)
local i, t, popen = 0, {}, io.popen
for filename in popen('ls -a "'..directory..'"'):lines() do
i = i + 1
t[i] = filename
end
return t
end
-- Returns a table with matches or nil
function match_pattern(pattern, text)
if text then
local matches = { string.match(text, pattern) }
if next(matches) then
return matches
end
end
-- nil
end
function is_sudo(msg, config)
local var = false
-- Check if user id is sudoer
if config.admin == msg.from.id then
var = true
end
return var
end
function service_modify_msg(msg)
if msg.new_chat_member then
msg.text = '//tgservice new_chat_member'
msg.text_lower = msg.text
elseif msg.left_chat_member then
msg.text = '//tgservice left_chat_member'
msg.text_lower = msg.text
elseif msg.new_chat_title then
msg.text = '//tgservice new_chat_title'
msg.text_lower = msg.text
elseif msg.new_chat_photo then
msg.text = '//tgservice new_chat_photo'
msg.text_lower = msg.text
elseif msg.group_chat_created then
msg.text = '//tgservice group_chat_created'
msg.text_lower = msg.text
elseif msg.supergroup_chat_created then
msg.text = '//tgservice supergroup_chat_created'
msg.text_lower = msg.text
elseif msg.channel_chat_created then
msg.text = '//tgservice channel_chat_created'
msg.text_lower = msg.text
elseif msg.migrate_to_chat_id then
msg.text = '//tgservice migrate_to_chat_id'
msg.text_lower = msg.text
elseif msg.migrate_from_chat_id then
msg.text = '//tgservice migrate_from_chat_id'
msg.text_lower = msg.text
end
return msg
end
function is_service_msg(msg)
local var = false
if msg.new_chat_member then
var = true
elseif msg.left_chat_member then
var = true
elseif msg.new_chat_title then
var = true
elseif msg.new_chat_photo then
var = true
elseif msg.group_chat_created then
var = true
elseif msg.supergroup_chat_created then
var = true
elseif msg.channel_chat_created then
var = true
elseif msg.migrate_to_chat_id then
var = true
elseif msg.migrate_from_chat_id then
var = true
end
return var
end
-- Make a POST request
-- URL = obvious
-- Arguments = Things, that go into the body. If sending a file, use 'io.open('path/to/file', "r")'
-- Headers = Header table. If not set, we will set a few!
function post_petition(url, arguments, headers)
local url, h = string.gsub(url, "http://", "")
local url, hs = string.gsub(url, "https://", "")
local post_prot = "http"
if hs == 1 then
post_prot = "https"
end
local response_body = {}
local request_constructor = {
url = post_prot..'://'..url,
method = "POST",
sink = ltn12.sink.table(response_body),
headers = headers or {},
redirect = false
}
local source = arguments
if type(arguments) == "table" then
source = helpers.url_encode_arguments(arguments)
end
if not headers then
request_constructor.headers["Content-Type"] = "application/x-www-form-urlencoded; charset=UTF8"
request_constructor.headers["X-Accept"] = "application/json"
request_constructor.headers["Accept"] = "application/json"
end
if type(arguments) == 'userdata' then
request_constructor.headers["Content-Length"] = get_file_size(source)
request_constructor.source = ltn12.source.file(source)
else
request_constructor.headers["Content-Length"] = tostring(#source)
request_constructor.source = ltn12.source.string(source)
end
if post_prot == "http" then
ok, response_code, response_headers, response_status_line = http.request(request_constructor)
else
ok, response_code, response_headers, response_status_line = https.request(request_constructor)
end
if not ok then
return nil
end
response_body = json.decode(table.concat(response_body))
return response_body, response_headers
end
function get_redis_hash(msg, var)
if msg.chat.type == 'group' or msg.chat.type == 'supergroup' then
return 'chat:'..msg.chat.id..':'..var
end
if msg.chat.type == 'private' then
return 'user:'..msg.from.id..':'..var
end
end
function round(num, idp)
if idp and idp>0 then
local mult = 10^idp
return math.floor(num * mult + 0.5) / mult
end
return math.floor(num + 0.5)
end
function comma_value(amount)
local formatted = amount
while true do
formatted, k = string.gsub(formatted, "^(-?%d+)(%d%d%d)", '%1.%2')
if (k==0) then
break
end
end
return formatted
end
function string.starts(String,Start)
return string.sub(String,1,string.len(Start))==Start
end
function string.ends(str, fin)
return fin=='' or string.sub(str,-string.len(fin)) == fin
end
function get_location(user_id)
local hash = 'user:'..user_id
local set_location = redis:hget(hash, 'location')
if set_location == 'false' or set_location == nil then
return false
else
return set_location
end
end
function cache_data(plugin, query, data, timeout, typ, hash_field)
-- How to: cache_data(pluginname, query_name, data_to_cache, expire_in_seconds, type, hash_field (if hash))
local hash = 'telegram:cache:'..plugin..':'..query
if timeout then
print('Caching "'..query..'" from plugin '..plugin..' (expires in '..timeout..' seconds)')
else
print('Caching "'..query..'" from plugin '..plugin..' (expires never)')
end
if typ == 'key' then
redis:set(hash, data)
elseif typ == 'set' then
-- make sure that you convert your data into a table:
-- {"foo", "bar", "baz"} instead of
-- {"bar" = "foo", "foo" = "bar", "bar" = "baz"}
-- because other formats are not supported by redis (or I haven't found a way to store them)
for _,str in pairs(data) do
redis:sadd(hash, str)
end
else
redis:hmset(hash, data)
end
if timeout then
redis:expire(hash, timeout)
end
end
-- Caches file_id and last_modified
-- result = result of send_X() (see media.lua)
function cache_file(result, url, last_modified)
local hash = 'telegram:cache:sent_file'
if result.result.video then
file_id = result.result.video.file_id
elseif result.result.audio then
file_id = result.result.audio.file_id
elseif result.result.voice then
file_id = result.result.voice.file_id
elseif result.result.document then
file_id = result.result.document.file_id
elseif result.result.photo then
local lv = #result.result.photo
file_id = result.result.photo[lv].file_id
elseif result.result.sticker then
file_id = result.result.sticker.file_id
end
print('Caching File...')
redis:hset(hash..':'..url, 'file_id', file_id)
redis:hset(hash..':'..url, 'last_modified', last_modified)
-- Why do we set a TTL? Because Telegram recycles outgoing file_id's
-- See: https://core.telegram.org/bots/faq#can-i-count-on-file-ids-to-be-persistent
redis:expire(hash..':'..url, 5259600) -- 2 months
end
function get_http_header(url)
local doer = http
local do_redir = true
if url:match('^https') then
doer = https
do_redir = false
end
local _, code, header = doer.request {
method = "HEAD",
url = url,
redirect = do_redir
}
if not header then return end
return header, code
end
-- checks with If-Modified-Since header, if url has been changed
-- URL and Last-Modified heder are required
function was_modified_since(url, last_modified)
local doer = http
local do_redir = true
if url:match('^https') then
doer = https
do_redir = false
end
local _, code, header = doer.request {
url = url,
method = "HEAD",
redirect = do_redir,
headers = {
["If-Modified-Since"] = last_modified
}
}
if code == 304 then
return false, nil, code
else
if header["last-modified"] then
new_last_modified = header["last-modified"]
elseif header["Last-Modified"] then
new_last_modified = header["Last-Modified"]
end
return true, new_last_modified, code
end
end
-- only url is needed!
function get_cached_file(url, file_name, receiver, chat_action)
local hash = 'telegram:cache:sent_file'
local cached_file_id = redis:hget(hash..':'..url, 'file_id')
local cached_last_modified = redis:hget(hash..':'..url, 'last_modified')
if cached_last_modified then
was_modified, new_last_modified, code = was_modified_since(url, cached_last_modified)
if not was_modified then
print('File wasn\'t modified, skipping download...')
return cached_file_id, nil, true
else
if code ~= 200 then
redis:del(hash..':'..url)
return
end
print('File was modified, redownloading...')
if receiver and chat_action then
utilities.send_typing(receiver, chat_action)
end
file = download_to_file(url, file_name)
return file, new_last_modified, false
end
end
-- get last-modified and Content-Length header
local header, code = get_http_header(url)
-- file size limit is 50 MB
if header then
if header["Content-Length"] then
if tonumber(header["Content-Length"]) > 52420000 then
print('file is too large, won\'t send!')
return nil
end
elseif header["content-length"] then
if tonumber(header["content-length"]) > 52420000 then
print('file is too large, won\'t send!')
return nil
end
end
if header["last-modified"] then
last_modified = header["last-modified"]
elseif header["Last-Modified"] then
last_modified = header["Last-Modified"]
end
else
last_modified = nil
end
if not last_modified then
nocache = true
else
nocache = false
end
if receiver and chat_action then
utilities.send_typing(receiver, chat_action)
end
if not nocache then
file = download_to_file(url, file_name)
else
print('No Last-Modified header!')
file = download_to_file(url, file_name)
end
return file, last_modified, nocache
end
-- converts total amount of seconds (e.g. 65 seconds) to human redable time (e.g. 1:05 minutes)
function makeHumanTime(totalseconds)
local seconds = totalseconds % 60
local minutes = math.floor(totalseconds / 60)
local minutes = minutes % 60
local hours = math.floor(totalseconds / 3600)
if minutes == 00 and hours == 00 then
if seconds == 1 then
return seconds..' Sekunde'
else
return seconds..' Sekunden'
end
elseif hours == 00 and minutes ~= 00 then
if minutes == 1 then
return string.format("%02d:%02d", minutes, seconds)..' Minute'
else
return string.format("%02d:%02d", minutes, seconds)..' Minuten'
end
elseif hours ~= 00 then
if hours == 1 then
return string.format("%02d:%02d:%02d", hours, minutes, seconds)..' Stunde'
else
return string.format("%02d:%02d:%02d", hours, minutes, seconds)..' Stunden'
end
end
end
function unescape(str)
str = string.gsub( str, '&lt;', '<' )
str = string.gsub( str, '&gt;', '>' )
str = string.gsub( str, '&quot;', '"' )
str = string.gsub( str, '&apos;', "'" )
str = string.gsub( str, "&Auml;", "Ä")
str = string.gsub( str, "&auml;", "ä")
str = string.gsub( str, "&Ouml;", "Ö")
str = string.gsub( str, "&ouml;", "ö")
str = string.gsub( str, "Uuml;", "Ü")
str = string.gsub( str, "&uuml;", "ü")
str = string.gsub( str, "&szlig;", "ß")
str = string.gsub( str, '&#(%d+);', function(n) return string.char(n) end )
str = string.gsub( str, '&#x(%d+);', function(n) return string.char(tonumber(n,16)) end )
str = string.gsub( str, '&amp;', '&' ) -- Be sure to do this after all others
return str
end
function table.contains(table, element)
for _, value in pairs(table) do
if value == element then
return true
end
end
return false
end
-- Checks if bot was disabled on specific chat
function is_channel_disabled(msg)
local hash = 'chat:'..msg.chat.id..':disabled'
local disabled = redis:get(hash)
if not disabled or disabled == "false" then
return false
end
return disabled
end
-- Converts a gross string back into proper UTF-8.
-- Useful for fixing improper encoding caused by bad JSON escaping.
function utilities.fix_utf8(str)
return string.char(utf8.codepoint(str, 1, -1))
end
return utilities