Use Twilio to let two friends communicate when one is texting and the other is calling

speaxter.rb

require 'twilio-ruby'
require 'sinatra'

# user 1 is texting
# user 2 is calling

ACCOUNT_SID = "..."
AUTH_TOKEN = "..."

TWILIO_PHONE_NUM = "+1..."

user1num = ""

# wait for starting text
get '/speaxter' do

    @client = Twilio::REST::Client.new ACCOUNT_SID, AUTH_TOKEN

    user1num = params[:From]
    
    # validate format
    message = params[:Body]
    
    if /CALL \+[0-9]{11,} .+/.match(message).nil?
        Twilio::TwiML::Response.new do |r|
            r.Message "Start conversation with \"CALL [phone number] [message]\". You put \"" + message + "\""
        end.text
   
    # start call
    else
        # add spaces to User 1's phone number so it's read as digits
        user1numLen = user1num.length
        numberIndex = 0
        user1numWithSpaces = String.new(user1num)
        for i in 0..user1numLen-1
            user1numWithSpaces.insert(numberIndex+1, ' ')
            numberIndex += 2
        end

        # prepare call message
        messageBodyIndex = message.index(/[0-9] /) + 2
        messageLength = message.length
        messageBody = "Message from " + user1numWithSpaces + ". " + message[messageBodyIndex..messageLength-1] + ". Please respond after the beep. Press any key to end your message."

        # figure out who to call
        user2numIndex = message.index(/\+[0-9]{11,}/)
        user2num = message[user2numIndex..messageBodyIndex-2]

        # change spaces to %20 for twimlet URL
        messageBody = messageBody.gsub(/ /, "%20")
        
        # create twimlet
        # creates a response that says a message (messageBody) and records
        twimletURL = "http://twimlets.com/echo?Twiml=%3CResponse%3E%0A%20%20%3CSay%3E" + messageBody + "%3C%2FSay%3E%0A%20%20%3CRecord%20action%3D%22http%3A%2F%2Ftwimlbin.com%2Fexternal%2Ff5f936c3db24c6d4%22%20method%3D%22get%22%20transcribe%3D%22true%22%20%2F%3E%0A%3C%2FResponse%3E"

        @client.account.calls.create({
            :from => TWILIO_PHONE_NUM,
            :to => user2num,
            :url => twimletURL,
            :status_callback => "https://fathomless-scrubland-4992.herokuapp.com/handle-call"
        })

    end
end

# reply to User 1 with User 2's message
post '/handle-call' do

    @client = Twilio::REST::Client.new ACCOUNT_SID, AUTH_TOKEN

    text = ""

    text = @client.account.transcriptions.list[0].transcription_text
    
    if defined? text || text == ""
        text = "no message :("
    end

    @client.messages.create(
        from: TWILIO_PHONE_NUM,
        to: user1num,
        body: text
    )
end