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Mikubot-2/otouto/utilities.lua
topkecleon acc7046d64 administration 1.13.1
Added optional target for kick/ban logs. Added flag 7 to use default log
 per group. This way, a realm can have a public kick/ban log but governors
 are able to opt out. Added flag 8, antilink. Kicks for Telegram join links
 which do not refer to groups within the realm. Added flag 9, modrights, to
 give moderators access to changing the group photo, title, link, and motd
 (config option is deprecated. RIP). /unban will reset the target's autokick
 counter. Added configuration for default flag settings.

Revision to bindings.lua.
BASE_URL has been moved to bindings. There is no real reason for it to remain
in instance. Token is passed to bindings.init at load. All plugins have been
updated accordingly.
2016-08-23 00:16:32 -04:00

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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 = {}
local HTTP = require('socket.http')
local ltn12 = require('ltn12')
local HTTPS = require('ssl.https')
local URL = require('socket.url')
local JSON = require('dkjson')
local bindings = require('otouto.bindings')
-- For the sake of ease to new contributors and familiarity to old contributors,
-- we'll provide a couple of aliases to real bindings here.
-- Edit: To keep things working and allow for HTML messages, you can now pass a
-- string for use_markdown and that will be sent as the parse mode.
function utilities.send_message(chat_id, text, disable_web_page_preview, reply_to_message_id, use_markdown)
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
}
)
end
function utilities.send_reply(msg, text, use_markdown)
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
}
)
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
-- Calculates the length of the given string as UTF-8 characters
function utilities.utf8_len(s)
local chars = 0
for i = 1, string.len(s) do
local b = string.byte(s, i)
if b < 128 or b >= 192 then
chars = chars + 1
end
end
return chars
end
-- Trims whitespace from a string.
function utilities.trim(str)
local s = str:gsub('^%s*(.-)%s*$', '%1')
return s
end
-- Loads a JSON file as a table.
function utilities.load_data(filename)
local f = io.open(filename)
if f then
local s = f:read('*all')
f:close()
return JSON.decode(s)
else
return {}
end
end
-- Saves a table to a JSON file.
function utilities.save_data(filename, data)
local s = JSON.encode(data)
local f = io.open(filename, 'w')
f:write(s)
f:close()
end
-- Gets coordinates for a location. Used by gMaps.lua, time.lua, weather.lua.
function utilities.get_coords(input, config)
local url = 'http://maps.googleapis.com/maps/api/geocode/json?address=' .. URL.escape(input)
local jstr, res = HTTP.request(url)
if res ~= 200 then
return config.errors.connection
end
local jdat = JSON.decode(jstr)
if jdat.status == 'ZERO_RESULTS' then
return config.errors.results
end
return {
lat = jdat.results[1].geometry.location.lat,
lon = jdat.results[1].geometry.location.lng
}
end
-- Get the number of values in a key/value table.
function utilities.table_size(tab)
local i = 0
for _,_ in pairs(tab) do
i = i + 1
end
return i
end
-- Just an easy way to get a user's full name.
-- Alternatively, abuse it to concat two strings like I do.
function utilities.build_name(first, last)
if last then
return first .. ' ' .. last
else
return first
end
end
function utilities:resolve_username(input)
input = input:gsub('^@', '')
for _, user in pairs(self.database.users) do
if user.username and user.username:lower() == input:lower() then
local t = {}
for key, val in pairs(user) do
t[key] = val
end
return t
end
end
end
function utilities:handle_exception(err, message, log_chat)
local output = string.format(
'[%s]\n%s: %s\n%s\n',
os.date('%F %T'),
self.info.username,
err or '',
message
)
if log_chat then
output = '<code>' .. utilities.html_escape(output) .. '</code>'
return utilities.send_message(log_chat, output, true, nil, 'html')
else
print(output)
end
end
function utilities.download_file(url, filename)
if not filename then
filename = url:match('.+/(.-)$') or os.time()
filename = '/tmp/' .. filename
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(filename, 'w+')
file:write(table.concat(body))
file:close()
return filename
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.with_http_timeout(timeout, fun)
local original = HTTP.TIMEOUT
HTTP.TIMEOUT = timeout
fun()
HTTP.TIMEOUT = original
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]',
}
utilities.set_meta = {}
utilities.set_meta.__index = utilities.set_meta
function utilities.new_set()
return setmetatable({__count = 0}, utilities.set_meta)
end
function utilities.set_meta:add(x)
if x == "__count" then
return false
else
if not self[x] then
self[x] = true
self.__count = self.__count + 1
end
return true
end
end
function utilities.set_meta:remove(x)
if x == "__count" then
return false
else
if self[x] then
self[x] = nil
self.__count = self.__count - 1
end
return true
end
end
function utilities.set_meta:__len()
return self.__count
end
-- Styling functions to keep things consistent and easily changeable across plugins.
-- More to be added.
utilities.style = {}
utilities.style.enquote = function(title, body)
return '*' .. title:gsub('*', '\\*') .. ':*\n"' .. utilities.md_escape(body) .. '"'
end
return utilities