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init.lua
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init.lua
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--[[
bindings.lua (rev. 2018/05/11)
otouto's bindings for the Telegram bot API.
https://core.telegram.org/bots/api
Copyright 2016-2018 topkecleon <drew@otou.to>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
]]--
local bindings = {}
local https = require('ssl.https')
local json = require('dkjson')
local ltn12 = require('ltn12')
local mp = require('multipart-post')
function bindings.set_token(token)
bindings.BASE_URL = 'https://api.telegram.org/bot' .. token .. '/'
bindings.FILE_URL = 'https://api.telegram.org/file/bot' .. token .. '/'
return bindings
end
-- Build and send a request to the API.
-- Expecting method, parameters, and ?file, where method is a string indicating
-- the API method and parameters is a key/value table of parameters with their
-- values. Optional file is a table of a key/value pair of the file type (eg
-- photo, document, video) and its location on-disk. The pair should be in
-- parameters instead if the desired file is a URL or file ID.
-- Returns true, response on success. Returns false, response on failure.
-- Returns nil on a connection failure. Errs on invalid methods.
function bindings.request(method, parameters, file)
parameters = parameters or {}
for k,v in pairs(parameters) do
parameters[k] = tostring(v)
end
if file and next(file) then
local file_type, file_name = next(file)
local file_file = io.open(file_name, 'r')
local file_data = {
filename = file_name,
data = file_file:read('*a')
}
file_file:close()
parameters[file_type] = file_data
end
if next(parameters) == nil then
parameters = {''}
end
local response = {}
local body, boundary = mp.encode(parameters)
local success, code = https.request{
url = bindings.BASE_URL .. method,
method = 'POST',
headers = {
["Content-Type"] = "multipart/form-data; boundary=" .. boundary,
["Content-Length"] = #body,
},
source = ltn12.source.string(body),
sink = ltn12.sink.table(response)
}
if not success then
io.write(method .. ': Connection error. [' .. code .. ']\n')
return
else
local result = json.decode(table.concat(response))
if not result then
io.write('Invalid response.\n' .. table.concat(response) .. '\n')
return
elseif result.ok then
return true, result
elseif result.description == 'Method not found' then
error(method .. ': Method not found.')
else
return false, result
end
end
end
function bindings.gen(_, key)
return function(params, file)
return bindings.request(key, params, file)
end
end
setmetatable(bindings, { __index = bindings.gen })
return bindings