- NEU: Voice-To-Text! "Übersetzt" Sprachnachrichten in Text (wit.ai Server API-Key muss eingetragen werden!)

- POST-Requests mit Dateien sind nun möglich

otouto/plugins/voice_to_text.lua

@@ -0,0 +1,61 @@
+local vtt = {}
+
+vtt.triggers = {
+  '/nil'
+}
+
+local apikey = cred_data.witai_apikey
+
+function vtt:pre_process(msg, config)
+  if not msg.voice then return msg end -- Ignore
+  local mime_type = msg.voice.mime_type
+  if mime_type ~= 'audio/ogg' then return msg end -- We only want to transcript voice messages
+  local file_id = msg.voice.file_id
+  local file_size = msg.voice.file_size
+  if file_size > 19922944 then
+	print('File is over 20 MB - can\'t download :(')
+	return msg
+  end
+  
+  utilities.send_typing(msg.chat.id, 'typing')
+  -- Saving file to the Telegram Cloud
+  local request = bindings.request('getFile', {
+		file_id = file_id
+  } )
+
+  local download_url = 'https://api.telegram.org/file/bot'..config.bot_api_key..'/'..request.result.file_path
+  local ogg_file_name = file_id..'.oga'
+  local ogg_file = download_to_file(download_url, ogg_file_name)
+  
+  -- Convert to MP3
+  run_command('ffmpeg -loglevel panic -i /tmp/'..ogg_file_name..' -ac 1 -y /tmp/'..file_id..'.mp3')
+  os.remove('/tmp/'..ogg_file_name)
+
+  local mp3_file = '/tmp/'..file_id..'.mp3'
+
+  -- Voice-To-Text via wit.ai
+  local headers = {
+	["Content-Type"] = "audio/mpeg3",
+	Authorization = "Bearer "..apikey
+  }
+  local data = post_petition('https://api.wit.ai/speech?v=20160526', io.open(mp3_file, 'r'), headers)
+  os.remove(mp3_file)
+
+  if not data then
+	return msg
+  end
+  
+  if not data._text then
+    utilities.send_reply(msg, 'Keine Stimme zu hören!')
+	return
+  end
+
+  utilities.send_reply(msg, data._text)
+    
+  return msg
+end
+
+function vtt:action(msg)
+end
+
+return vtt

otouto/utilities.lua

@@ -450,6 +450,15 @@ function utilities.save_data(filename, data)
 	f:close()
 end
 
+-- Returns file size as Integer
+-- See: https://www.lua.org/pil/21.3.html
+function get_file_size(file)
+  local current = file:seek()      -- get current position
+  local size = file:seek("end")    -- get file size
+  file:seek("set", current)        -- restore position
+  return tonumber(size)
+end
+
  -- Gets coordinates for a location. Used by gMaps.lua, time.lua, weather.lua.
 function utilities.get_coords(input, config)
   local url = 'https://maps.googleapis.com/maps/api/geocode/json?address='..URL.escape(input)..'&language=de'
@@ -723,6 +732,10 @@ function is_service_msg(msg)
   return var
 end
 
+-- Make a POST request
+-- URL = obvious
+-- Arguments = Things, that go into the body. If sending a file, use 'io.open('path/to/file', "r")'
+-- Headers = Header table. If not set, we will set a few!
 function post_petition(url, arguments, headers)
    local url, h = string.gsub(url, "http://", "")
    local url, hs = string.gsub(url, "https://", "")
@@ -749,8 +762,13 @@ function post_petition(url, arguments, headers)
      request_constructor.headers["X-Accept"] = "application/json"
 	 request_constructor.headers["Accept"] = "application/json"
    end
-   request_constructor.headers["Content-Length"] = tostring(#source)
-   request_constructor.source = ltn12.source.string(source)
+   if type(arguments) == 'userdata' then
+     request_constructor.headers["Content-Length"] = get_file_size(source)
+     request_constructor.source = ltn12.source.file(source)
+   else 
+     request_constructor.headers["Content-Length"] = tostring(#source)
+     request_constructor.source = ltn12.source.string(source)
+  end
    
    if post_prot == "http" then
      ok, response_code, response_headers, response_status_line = http.request(request_constructor)