Added a file downloader

homeassistant/actors.py

@@ -6,14 +6,17 @@ This module provides actors that will react to events happening within homeassis
 
 """
 
+import os
 import logging
 from datetime import datetime, timedelta
+import re
 
 import dateutil.parser
 from phue import Bridge
+import requests
 
 from . import track_state_change
-
+from .util import sanitize_filename
 from .observers import (STATE_CATEGORY_SUN, SUN_STATE_BELOW_HORIZON, SUN_STATE_ABOVE_HORIZON,
                         STATE_CATEGORY_ALL_DEVICES, DEVICE_STATE_HOME, DEVICE_STATE_NOT_HOME,
                         STATE_CATEGORY_NEXT_SUN_SETTING, track_time_change)
@@ -22,6 +25,8 @@ LIGHT_TRANSITION_TIME = timedelta(minutes=15)
 
 HUE_MAX_TRANSITION_TIME = 9000
 
+EVENT_DOWNLOAD_FILE = "download_file"
+
 EVENT_TURN_LIGHT_ON = "turn_light_on"
 EVENT_TURN_LIGHT_OFF = "turn_light_off"
 
@@ -177,3 +182,59 @@ class HueLightControl(object):
             command['transitiontime'] = _hue_process_transition_time(transition_seconds)
 
         self.bridge.set_light(light_id, command)
+
+
+def setup_file_downloader(eventbus, download_path):
+    """ Listens for download events to download files. """
+
+    logger = logging.getLogger(__name__)
+
+    if not os.path.isdir(download_path):
+        logger.error("Download path {} does not exist. File Downloader not active.".format(download_path))
+        return
+
+    def download_file(event):
+        """ Downloads file specified in the url. """
+        try:
+            req = requests.get(event.data['url'], stream=True)
+            if req.status_code == 200:
+                filename = None
+
+                if 'content-disposition' in req.headers:
+                    match = re.findall(r"filename=(\S+)", req.headers['content-disposition'])
+
+                    if len(match) > 0:
+                        filename = match[0].strip("'\" ")
+
+                if not filename:
+                    filename = os.path.basename(event.data['url']).strip()
+
+                if not filename:
+                    filename = "ha_download"
+
+                # Remove stuff to ruin paths
+                filename = sanitize_filename(filename)
+
+                path, ext = os.path.splitext(os.path.join(download_path, filename))
+
+                # If file exist append a number. We test filename, filename_2, filename_3 etc..
+                tries = 0
+                while True:
+                    tries += 1
+
+                    final_path = path + ("" if tries == 1 else "_{}".format(tries)) + ext
+
+                    if not os.path.isfile(final_path):
+                        break
+
+                logger.info("FileDownloader:{} -> {}".format(event.data['url'], final_path))
+
+                with open(final_path, 'wb') as fil:
+                    for chunk in req.iter_content(1024):
+                        fil.write(chunk)
+
+        except requests.exceptions.ConnectionError:
+            logger.exception("FileDownloader:ConnectionError occured for {}".format(event.data['url']))
+
+
+    eventbus.listen(EVENT_DOWNLOAD_FILE, download_file)

homeassistant/util.py

@@ -0,0 +1,7 @@
+""" Helper methods for various modules. """
+
+import re
+
+def sanitize_filename(filename):
+    """ Sanitizes a filename by removing .. / and \\. """
+    return re.sub(r"(~|(\.\.)|/|\+)", "", filename)

start.py

@@ -3,7 +3,7 @@ from ConfigParser import SafeConfigParser
 from homeassistant import StateMachine, EventBus, start_home_assistant
 
 from homeassistant.observers import TomatoDeviceScanner, DeviceTracker, track_sun
-from homeassistant.actors import HueLightControl, LightTrigger
+from homeassistant.actors import HueLightControl, LightTrigger, setup_file_downloader
 from homeassistant.httpinterface import HTTPInterface
 
 from lib.pychromecast import play_youtube_video
@@ -32,6 +32,8 @@ if config.has_option("chromecast", "host"):
 	eventbus.listen("start_fireplace", lambda event: play_youtube_video(config.get("chromecast","host"), "eyU3bRy2x44"))
 	eventbus.listen("start_epic_sax", lambda event: play_youtube_video(config.get("chromecast","host"), "kxopViU98Xo"))
 
+setup_file_downloader(eventbus, "downloads")
+
 # Init HTTP interface
 HTTPInterface(eventbus, statemachine, config.get("common","api_password"))