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imgur.lua
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imgur.lua
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--[[
Copyright 2020 Matthew Hesketh <matthew@matthewhesketh.com>
This code is licensed under the MIT. See LICENSE for details.
]]
local imgur = {}
local mattata = require('mattata')
local https = require('ssl.https')
local url = require('socket.url')
local ltn12 = require('ltn12')
local json = require('dkjson')
function imgur:init()
imgur.commands = mattata.commands(self.info.username):command('imgur').table
imgur.help = '/imgur - Uploads the replied-to photo to Imgur and returns the post URL. If the image has a caption, that caption is used as the description.'
end
function imgur:on_message(message, configuration, language)
if not message.reply
then
return mattata.send_reply(
message,
'You must send this message as a reply to the photo you want to upload!'
)
elseif not message.reply.photo
then
return mattata.send_reply(
message,
'That\'s not a photo! You must send this command in reply to a photo.'
)
end
local success = mattata.get_file(message.reply.photo[#message.reply.photo].file_id)
if not success
or not success.result
or not success.result.file_path
then
return mattata.send_reply(
message,
'There was an error whilst retrieving that photo, so I could not upload it to Imgur - perhaps it\'s too old?'
)
end
local query = 'image=' .. url.escape('https://api.telegram.org/file/bot' .. configuration.bot_token .. '/' .. success.result.file_path)
if message.reply.caption
then
if message.reply.caption:match('^.- %- .-$')
then
local title, description = message.reply.caption:match('^(.-) %- (.-)$')
query = query .. '&title=' .. url.escape(title)
message.reply.caption = description
end
query = query .. '&description=' .. url.escape(message.reply.caption)
end
local response = {}
local _, res = https.request(
{
['url'] = 'https://api.imgur.com/3/image',
['method'] = 'POST',
['headers'] = {
['Authorization'] = 'Client-ID ' .. configuration['keys']['imgur']['client_id'],
['Content-Type'] = 'application/x-www-form-urlencoded',
['Content-Length'] = query:len()
},
['source'] = ltn12.source.string(query),
['sink'] = ltn12.sink.table(response)
}
)
if res ~= 200
then
return mattata.send_reply(
message,
language['errors']['connection']
)
end
local jstr = table.concat(response)
local jdat = json.decode(jstr)
if not jdat
or not jdat.success
or not jdat.data
or not jdat.data.link
then
return mattata.send_reply(
message,
'There was an error whilst uploading that photo to Imgur!'
)
end
return mattata.send_reply(
message.reply,
'Image successfully uploaded to Imgur. Click [here](https://' .. jdat.data.link:match('^https?://i%.(.-%..-)%.') .. ') to view it.',
'markdown'
)
end
return imgur

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