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currency.lua
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currency.lua
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--[[
mattata v2.0 - Currency Plugin
Currency conversion using the frankfurter.app API (free, no key needed).
Frankfurter uses ECB (European Central Bank) rates.
]]
local plugin = {}
plugin.name = 'currency'
plugin.category = 'utility'
plugin.description = 'Convert between currencies'
plugin.commands = { 'currency', 'convert', 'cash' }
plugin.help = '/currency <amount> <from> to <to> - Convert between currencies.\nExample: /currency 10 USD to EUR'
local http = require('src.core.http')
local tools = require('telegram-bot-lua.tools')
local function convert(amount, from, to)
local request_url = string.format(
'https://api.frankfurter.app/latest?amount=%.2f&from=%s&to=%s',
amount, from:upper(), to:upper()
)
local data, _ = http.get_json(request_url)
if not data then
return nil, 'Currency conversion request failed. Check that the currency codes are valid.'
end
if data.message then
return nil, 'API error: ' .. tostring(data.message)
end
if not data.rates then
return nil, 'No conversion rates returned. Check your currency codes.'
end
local target_key = to:upper()
if not data.rates[target_key] then
return nil, 'Currency "' .. target_key .. '" is not supported.'
end
return {
amount = data.amount,
from = data.base,
to = target_key,
result = data.rates[target_key],
date = data.date
}
end
local function format_number(n)
if n >= 1 then
return string.format('%.2f', n)
elseif n >= 0.01 then
return string.format('%.4f', n)
else
return string.format('%.6f', n)
end
end
function plugin.on_message(api, message, ctx)
local input = message.args
if not input or input == '' then
return api.send_message(
message.chat.id,
'Please provide a conversion query.\nUsage: <code>/currency 10 USD to EUR</code>',
{ parse_mode = 'html' }
)
end
-- Parse: <amount> <from> to <to>
-- Also support: <amount> <from> <to>, <from> to <to> (assume amount=1)
local amount, from, to
-- Try: 10 USD to EUR / 10 USD in EUR
amount, from, to = input:match('^([%d%.]+)%s*(%a+)%s+[tT][oO]%s+(%a+)$')
if not amount then
amount, from, to = input:match('^([%d%.]+)%s*(%a+)%s+[iI][nN]%s+(%a+)$')
end
-- Try: 10 USD EUR
if not amount then
amount, from, to = input:match('^([%d%.]+)%s*(%a+)%s+(%a+)$')
end
-- Try: USD to EUR (amount=1)
if not amount then
from, to = input:match('^(%a+)%s+[tT][oO]%s+(%a+)$')
if from then
amount = '1'
end
end
-- Try: USD EUR (amount=1)
if not amount then
from, to = input:match('^(%a+)%s+(%a+)$')
if from then
amount = '1'
end
end
if not amount or not from or not to then
return api.send_message(
message.chat.id,
'Invalid format. Please use:\n<code>/currency 10 USD to EUR</code>\n<code>/currency USD EUR</code>',
{ parse_mode = 'html' }
)
end
amount = tonumber(amount)
if not amount or amount <= 0 then
return api.send_message(message.chat.id, 'Please enter a valid positive number for the amount.')
end
if amount > 999999999 then
return api.send_message(message.chat.id, 'Amount is too large.')
end
from = from:upper()
to = to:upper()
if from == to then
return api.send_message(
message.chat.id,
string.format('<b>%s %s</b> = <b>%s %s</b>', format_number(amount), tools.escape_html(from), format_number(amount), tools.escape_html(to)),
{ parse_mode = 'html' }
)
end
local result, err = convert(amount, from, to)
if not result then
return api.send_message(message.chat.id, err)
end
local output = string.format(
'<b>%s %s</b> = <b>%s %s</b>\n<i>Rate as of %s (ECB)</i>',
format_number(result.amount),
tools.escape_html(result.from),
format_number(result.result),
tools.escape_html(result.to),
tools.escape_html(result.date)
)
return api.send_message(message.chat.id, output, { parse_mode = 'html' })
end
return plugin

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