Class: TelegramBotMiddleware

Inherits:
Object
  • Object
show all
Includes:
HTTMultiParty
Defined in:
lib/telegram_bot_middleware.rb,
lib/telegram_bot_middleware/version.rb

Constant Summary collapse

VERSION = 
"0.1.0"

Instance Method Summary collapse

Constructor Details

#initialize(app) {|@config| ... } ⇒ TelegramBotMiddleware

Returns a new instance of TelegramBotMiddleware.

Yields:

  • (@config) 


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# File 'lib/telegram_bot_middleware.rb', line 16

def initialize(app, &block)
  # save the app var
  @app = app
  
  puts 'Initializing...'
  
  # create the config and populate passing do the block function
  @config = OpenStruct.new
  yield(@config) if block_given?

  # setup webhook
  if @config.webhook.nil?
    @config.host = "#{@config.host}/" unless @config.host.end_with?('/')
    @config.webhook = "#{@config.host}#{@config.token}"
  end
  
  # setup telegram messages input
  case @config.get_updates
    
    # setup polling
    when :polling
      # clear the webhook in case was set in the past
      send_to_bot('setWebhook', {url: ''})
      
      # setup a thread with get_updates function
      start_get_updates_thread
    
    # setup webhook
    when :webhook
      send_to_bot('setWebhook', {url: @config.webhook})
    
    # in this case get_updates is a non valid value
    else
      raise ArgumentError.new('Config error: get_updates must be :webhook or :polling.')
  end
end

Instance Method Details

#_call(env) ⇒ Object 



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# File 'lib/telegram_bot_middleware.rb', line 82

def _call(env)
  # retrieve the request object
  req = Rack::Request.new(env)
  
  # if the request is a post to bot webhhok
  if req.post? and req.path == "/#{@config.token}"
    
    # in case someone already read it
    req.body.rewind
    # build an openstruct based on post params
    params = OpenStruct.from_json(req.body.read)
    
    # build path based on message
    # - get only message part of post params
    # - remove empty chars from beginning or end (strip)
    # - replace first sequence of spaces with /
    # - encode as uri
    path = URI.escape(params.message.text.strip.sub(/\s+/, '/'))
    # - add first / if not present
    path = "/#{path}" unless path.start_with?('/')
    
    # build the querystring using message but nested
    query_string = Rack::Utils.build_nested_query(params.message.to_h_nested)
    
    # transform the POST in GET
    env['PATH_INFO'] = path
    env['QUERY_STRING'] = query_string
    env['REQUEST_METHOD'] = 'GET'
    env['REQUEST_URI'] = "https://#{req.host}#{path}"
    # TODO use update(hash) { |name, old_value, new_value| }
    
    # call the rack stack
    status, headers, body = @app.call(env)
    
    if status == 200 or status == '200'
      
      case headers['Content-Type'].split(';').first
        when 'text/html', 'application/json'          
          
          if body.is_a? Hash
          
            query = body.clone
            query[:chat_id] = params.message.chat.id unless query.include?(:chat_id)
            query[:reply_markup] = query[:reply_markup].to_json if query.include?(:reply_markup)
            
            body = Array.new(1) { '' }
            
            if query.include?(:text)
              send_to_bot('sendMessage', query)
            elsif query.include?(:latitude) and query.include?(:longitude)
              send_to_bot('sendLocation', query)
            elsif query.include?(:photo)
              send_to_bot('sendPhoto', query)
            elsif query.include?(:audio)
              send_to_bot('sendAudio', query)              
            elsif query.include?(:video)
              send_to_bot('sendVideo', query)              
            else
              # TODO: invalid query
            end
            
          else
            body.each do |data|
              send_to_bot('sendMessage', {chat_id: params.message.chat.id, text: data})
            end
          end
      
        when /(^image\/)/
          send_to_bot('sendPhoto', {chat_id: params.message.chat.id, photo: File.new(body)})
      
        when /(^audio\/)/
          send_to_bot('sendAudio', {chat_id: params.message.chat.id, audio: File.new(body)})
        
        when /(^video\/)/
          send_to_bot('sendVideo', {chat_id: params.message.chat.id, video: File.new(body)})          
      end
    end
    
    # return result
    [status, headers, body]
  else
    # normal rack flow - not a bot call
    @app.call(env)
  end
end

#call(env) ⇒ Object

necessary for thread safe



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# File 'lib/telegram_bot_middleware.rb', line 78

def call(env)
  dup._call(env)
end

#send_to_bot(path, query) ⇒ Object 



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# File 'lib/telegram_bot_middleware.rb', line 168

def send_to_bot(path, query)
  response = self.class.post("/bot#{@config.token}/#{path}", query: query)
  # TODO check respobse error
end

#start_get_updates_thread ⇒ Object 



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# File 'lib/telegram_bot_middleware.rb', line 53

def start_get_updates_thread
  # start a new thread
  Thread.new do
    # the initial offset is always 0
    @offset = 0      
    # wait 5 seconds to don't risk to post message too early when the app is not still up
    sleep 5
    # loop forever
    loop do
      # call the getUpdates telegram function
      response = send_to_bot('getUpdates', {offset: @offset})
      # enumerate the results
      response.to_hash['result'].each do |data|
        # create an update message from the post data
        update = OpenStruct.new(data)
        # store the last offset +1 but ensure that is not lower than the already stored
        @offset = (update.update_id + 1) if update.update_id + 1 > @offset
        # simulate a post to itself
        HTTP.post @config.webhook, json: update.to_h_nested
      end
    end
  end
end