Change improve security of cached image use.

Change add helper function to validate acceptable image file extension.

CHANGES.md

@@ -172,7 +172,7 @@
 * Fix status reset of a snatched, downloaded, or archived episode when its date is set to never (no date) on the info
   source and there is no media file
 * Change only show unaired episodes on Manage/Backlog Overview and Manage/Episode Status Management where relevant
-* Change locally cache "Add from Trakt" show posters
+* Change locally cache Trakt/IMDb/Anime show cards
 * Change allow pp to replace files with a repack or proper of same quality
 * Fix ensure downloaded eps are not shown on episode view
 * Fix allow propers to pp when show marked upgrade once
@@ -199,6 +199,8 @@
 * Change use legacy tzlocal() if new gettz fails to create
 * Change load cached images on demand
 * Change add rate limit handler for info source
+* Change improve security of cached image use
+* Change add helper function to validate acceptable image file extension
 
 
 ### 0.11.16 (2016-10-16 17:30:00 UTC)

sickbeard/__init__.py

@@ -37,7 +37,7 @@ sys.path.insert(1, os.path.abspath('../lib'))
 from sickbeard import helpers, encodingKludge as ek
 from sickbeard import db, logger, naming, metadata, providers, scene_exceptions, scene_numbering, \
     scheduler, auto_post_processer, search_queue, search_propers, search_recent, search_backlog, \
-    show_queue, show_updater, subtitles, traktChecker, version_checker, indexermapper
+    show_queue, show_updater, subtitles, traktChecker, version_checker, indexermapper, classes
 from sickbeard.config import CheckSection, check_setting_int, check_setting_str, ConfigMigrator, minimax
 from sickbeard.common import SD, SKIPPED
 from sickbeard.databases import mainDB, cache_db, failed_db
@@ -488,6 +488,8 @@ else:
 
 COOKIE_SECRET = base64.b64encode(uuid.uuid4().bytes + uuid.uuid4().bytes)
 
+CACHE_IMAGE_URL_LIST = classes.ImageUrlList()
+
 __INITIALIZED__ = False
 
 
@@ -545,7 +547,7 @@ def initialize(consoleLogging=True):
             ANIME_DEFAULT, NAMING_ANIME, USE_ANIDB, ANIDB_USERNAME, ANIDB_PASSWORD, ANIDB_USE_MYLIST, \
             SCENE_DEFAULT, BACKLOG_DAYS, SEARCH_UNAIRED, UNAIRED_RECENT_SEARCH_ONLY, ANIME_TREAT_AS_HDTV, \
             COOKIE_SECRET, USE_IMDB_INFO, IMDB_ACCOUNTS, DISPLAY_BACKGROUND, DISPLAY_BACKGROUND_TRANSPARENT, DISPLAY_ALL_SEASONS, \
-            SHOW_TAGS, DEFAULT_SHOW_TAG, SHOWLIST_TAGVIEW, background_mapping_task
+            SHOW_TAGS, DEFAULT_SHOW_TAG, SHOWLIST_TAGVIEW, background_mapping_task, CACHE_IMAGE_URL_LIST
 
         if __INITIALIZED__:
             return False

sickbeard/classes.py

@@ -229,6 +229,7 @@ class UIError():
         self.message = message
         self.time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
 
+
 class OrderedDefaultdict(OrderedDict):
     def __init__(self, *args, **kwargs):
         if not args:
@@ -248,4 +249,37 @@ class OrderedDefaultdict(OrderedDict):
 
     def __reduce__(self):  # optional, for pickle support
         args = (self.default_factory,) if self.default_factory else ()
-        return self.__class__, args, None, None, self.iteritems()
+        return self.__class__, args, None, None, self.iteritems()
+
+
+class ImageUrlList(list):
+    def __init__(self, iterable=None, max_age=30):
+        super(ImageUrlList, self).__init__()
+        self.max_age = max_age
+
+    def add_url(self, url):
+        self.remove_old()
+        for x in self:
+            if isinstance(x, (tuple, list)) and len(x) == 2 and url == x[0]:
+                x = (x[0], datetime.datetime.now())
+                return
+        self.append((url, datetime.datetime.now()))
+
+    def remove_old(self):
+        age_limit = datetime.datetime.now() - datetime.timedelta(minutes=self.max_age)
+        self[:] = [x for x in self if isinstance(x, (tuple, list)) and len(x) == 2 and x[1] > age_limit]
+
+    def __repr__(self):
+        return str([x[0] for x in self if isinstance(x, (tuple, list)) and len(x) == 2])
+
+    def __contains__(self, y):
+        for x in self:
+            if isinstance(x, (tuple, list)) and len(x) == 2 and y == x[0]:
+                return True
+        return False
+
+    def remove(self, x):
+        for v in self:
+            if isinstance(v, (tuple, list)) and len(v) == 2 and v[0] == x:
+                super(ImageUrlList, self).remove(v)
+                break

sickbeard/helpers.py

@@ -143,6 +143,15 @@ def has_media_ext(filename):
     return (None is re.search('extras?$', sep_file[0], re.I)) and (sep_file[2].lower() in mediaExtensions)
 
 
+def has_image_ext(filename):
+    try:
+        if ek.ek(os.path.splitext, filename)[1].lower() in ['.bmp', '.gif', '.jpeg', '.jpg', '.png', '.webp']:
+            return True
+    except (StandardError, Exception):
+        pass
+    return False
+
+
 def is_first_rar_volume(filename):
 
     return None is not re.search('(?P<file>^(?P<base>(?:(?!\.part\d+\.rar$).)*)\.(?:(?:part0*1\.)?rar)$)', filename)

sickbeard/webserve.py

@@ -46,7 +46,7 @@ from sickbeard.common import Quality, Overview, statusStrings, qualityPresetStri
 from sickbeard.common import SNATCHED, UNAIRED, IGNORED, ARCHIVED, WANTED, FAILED, SKIPPED, DOWNLOADED, SNATCHED_BEST, SNATCHED_PROPER
 from sickbeard.common import SD, HD720p, HD1080p
 from sickbeard.exceptions import ex
-from sickbeard.helpers import remove_article, starify
+from sickbeard.helpers import has_image_ext, remove_article, starify
 from sickbeard.indexers.indexer_config import INDEXER_TVDB, INDEXER_TVRAGE
 from sickbeard.scene_numbering import get_scene_numbering, set_scene_numbering, get_scene_numbering_for_show, \
     get_xem_numbering_for_show, get_scene_absolute_numbering_for_show, get_xem_absolute_numbering_for_show, \
@@ -2657,6 +2657,7 @@ class NewHomeAddShows(Home):
 
                         img_uri = 'http://img7.anidb.net/pics/anime/%s' % image
                         images = dict(poster=dict(thumb='imagecache?path=anidb&source=%s' % img_uri))
+                        sickbeard.CACHE_IMAGE_URL_LIST.add_url(img_uri)
 
                         votes = rating = 0
                         counts = anime.find('./ratings/permanent')
@@ -2823,6 +2824,7 @@ class NewHomeAddShows(Home):
                             img_uri = img_uri.replace(match.group(), ''.join(
                                 [str(y) for x in map(None, parts, scaled) for y in x if y is not None]))
                             images = dict(poster=dict(thumb='imagecache?path=imdb&source=%s' % img_uri))
+                            sickbeard.CACHE_IMAGE_URL_LIST.add_url(img_uri)
 
                     filtered.append(dict(
                         premiered=dt_ordinal,
@@ -3058,6 +3060,7 @@ class NewHomeAddShows(Home):
                 img_uri = item.get('show', {}).get('images', {}).get('poster', {}).get('thumb', {}) or ''
                 if img_uri:
                     images = dict(poster=dict(thumb='imagecache?path=trakt/poster/thumb&source=%s' % img_uri))
+                    sickbeard.CACHE_IMAGE_URL_LIST.add_url(img_uri)
 
                 filtered.append(dict(
                     premiered=dt_ordinal,
@@ -5598,8 +5601,6 @@ class Cache(MainHandler):
         if not sql_results:
             sql_results = []
 
-
-
         t = PageTemplate(headers=self.request.headers, file='cache.tmpl')
         t.cacheResults = sql_results
 
@@ -5613,7 +5614,8 @@ class CachedImages(MainHandler):
         file_name = ek.ek(os.path.basename, source)
         static_image_path = ek.ek(os.path.join, sickbeard.CACHE_DIR, 'images', path, file_name)
         static_image_path = ek.ek(os.path.abspath, static_image_path.replace('\\', '/'))
-        if not ek.ek(os.path.isfile, static_image_path) and source is not None:
+        if not ek.ek(os.path.isfile, static_image_path) and source is not None and has_image_ext(file_name) \
+                and source in sickbeard.CACHE_IMAGE_URL_LIST:
             basepath = ek.ek(os.path.dirname, static_image_path)
             helpers.make_dirs(basepath)
             if not helpers.download_file(source, static_image_path) and source.find('trakt.us'):
@@ -5624,4 +5626,3 @@ class CachedImages(MainHandler):
         else:
             helpers.set_file_timestamp(static_image_path, min_age=3, new_time=None)
             self.redirect('cache/images/%s/%s' % (path, file_name))
-