Mikubot-2/otouto/plugins/gImages.lua

 -- You need a Google API key and a Google Custom Search Engine set up to use this, in config.google_api_key and config.google_cse_key, respectively.
 -- You must also sign up for the CSE in the Google Developer Console, and enable image results.

local gImages = {}

local HTTPS = require('ssl.https')
local URL = require('socket.url')
local JSON = require('dkjson')
local utilities = require('otouto.utilities')

function gImages:init(config)
    assert(config.google_api_key and config.google_cse_key,
        'gImages.lua requires a Google API key from http://console.developers.google.com and a Google Custom Search Engine key from http://cse.google.com/cse.'
    )

    gImages.triggers = utilities.triggers(self.info.username, config.cmd_pat):t('image', true):t('i', true):t('insfw', true).table
    gImages.doc = config.cmd_pat .. [[image <query>
Returns a randomized top result from Google Images. Safe search is enabled by default; use "]] .. config.cmd_pat .. [[insfw" to disable it. NSFW results will not display an image preview.
Alias: ]] .. config.cmd_pat .. 'i'
    gImages.search_url = 'https://www.googleapis.com/customsearch/v1?&searchType=image&imgSize=xlarge&alt=json&num=8&start=1&key=' .. config.google_api_key .. '&cx=' .. config.google_cse_key
end

gImages.command = 'image <query>'

function gImages:action(msg, config)

    local input = utilities.input_from_msg(msg)
    if not input then
        utilities.send_reply(self, msg, gImages.doc, true)
        return
    end

    local url = gImages.search_url

    if not string.match(msg.text, '^'..config.cmd_pat..'i[mage]*nsfw') then
        url = url .. '&safe=high'
    end

    url = url .. '&q=' .. URL.escape(input)

    local jstr, res = HTTPS.request(url)
    if res ~= 200 then
        utilities.send_reply(self, msg, config.errors.connection)
        return
    end

    local jdat = JSON.decode(jstr)
    if jdat.searchInformation.totalResults == '0' then
        utilities.send_reply(self, msg, config.errors.results)
        return
    end

    local i = math.random(jdat.queries.request[1].count)
    local img_url = jdat.items[i].link
    local img_title = jdat.items[i].title
    local output = '[' .. img_title .. '](' .. img_url .. ')'


    if msg.text:match('nsfw') then
        utilities.send_reply(self, '*NSFW*\n'..msg, output)
    else
        utilities.send_message(self, msg.chat.id, output, false, nil, true)
    end

end

return gImages