Added logging, use html5lib instead of html.parser (better results overall), disallow adding feed with missing required fields

hrss/settings.py

@@ -123,3 +123,37 @@ STATIC_URL = '/static/'
 STATIC_ROOT = os.path.join(BASE_DIR, 'static')
 
 USE_X_FORWARDED_HOST = True
+
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'formatters': {
+        'verbose': {
+            'format': '[%(asctime)s] [%(levelname)s] [%(module)s] %(message)s'
+        },
+        'simple': {
+            'format': '%(levelname)s %(message)s'
+        },
+    },
+    'handlers': {
+        'file': {
+            'class': 'logging.FileHandler',
+            'filename': 'debug.log',
+            'formatter': 'verbose'
+        },
+        'console': {
+            'class': 'logging.StreamHandler',
+            'formatter': 'verbose'
+        },
+    },
+    'loggers': {
+        'web': {
+            'handlers': ['console', 'file'],
+            'level': 'DEBUG',
+        },
+        'django': {
+            'handlers': ['console', 'file'],
+            'level': 'ERROR',
+        }
+    }
+}

requirements.txt

@@ -1,3 +1,4 @@
 Django>=2.1.2
 beautifulsoup4>=4.6.3
 requests>=2.20.0
+html5lib>=1.0.1

web/utils.py

@@ -2,20 +2,25 @@ import requests
 from django.core.validators import URLValidator
 from django.core.exceptions import ValidationError
 from requests.exceptions import RequestException
-
 from bs4 import BeautifulSoup
+import logging
 
+logger = logging.getLogger(__name__)
+
+def get_url(url):
+    headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"}
+    return requests.get(url, headers=headers)
 
 def is_valid_url(url):
     try:
         URLValidator()(url)
-        requests.get(url).raise_for_status()
+        get_url(url).raise_for_status()
         return True
     except ValidationError as e:
-        print(url+" is not a valid url")
+        logger.debug(url+" is not a valid url")
         return False
     except RequestException as e:
-        print(url+" led to exception: "+str(e))
+        logger.debug(url+" led to exception: "+str(e))
         return False
 
 
@@ -23,24 +28,34 @@ def find_longest_common_string(s1, s2):
     from difflib import SequenceMatcher
 
     match = SequenceMatcher(None, s1, s2).find_longest_match(0, len(s1), 0, len(s2))
-    return s1[match.a: match.a + match.size]  # -> apple pie
+    return s1[match.a: match.a + match.size]
+
 
 def fetch_feed(feed, limit=10):
+    logger.debug("Fetching feed "+feed.url)
     items=[]
-    rep = requests.get(feed.url).text
+    rep = get_url(feed.url).text
-    soup = BeautifulSoup(rep)
+    soup = BeautifulSoup(rep, "html5lib")
-    elements = soup.select(feed.element)
+    try:
+        elements = soup.select(feed.element)
+    except Exception as e:
+        logger.debug("Error while fetching elements ("+feed.element+"): "+str(e))
+        return False
+    logger.debug("Found "+str(len(elements))+" news")
     for element in elements:
         if len(items) >= limit:
             break
-
+        logger.debug("Title ("+feed.element+ " > "+feed.title+")")
         try:
             title = element.select(feed.title)[0].text
-        except Exception:
+            logger.debug("Match title "+title)
+        except Exception as e:
+            logger.debug("Error while selecting feed title: "+str(e))
             return False
         try:
             content = element.select(feed.content)[0].text
-        except Exception:
+        except Exception as e:
+            logger.debug("Error while selecting content: "+str(e))
             return False
         try:
             date = element.select(feed.date)[0].text

web/views.py

@@ -4,22 +4,25 @@ from .utils import *
 from .models import Feed
 from django.db.models import ObjectDoesNotExist
 from bs4 import BeautifulSoup
+import logging
 # Create your views here.
 
+logger = logging.getLogger(__name__)
 
 def iframe(request, url):
-    content_type = False
     try:
-        req = requests.get(url)
+        req = get_url(url)
         html = req.content
         bs = False
 
         content_type = req.headers["Content-Type"] if "Content-Type" in req.headers else False
 
         if not content_type or content_type.startswith("text/html"):
+            logger.debug("No content-type or content-type ~= '^text/html'")
             bs = BeautifulSoup(html, 'html.parser')
             base_scheme = url.split("://")[0]
             base_url = url.split("//")[-1].split("/")[0].split('?')[0]
+            logger.debug("URL: "+base_scheme+"://"+base_url)
 
             # fixes
             # fix click links
@@ -33,6 +36,11 @@ def iframe(request, url):
                 if link["href"].startswith("/"):
                     link["href"] = "/iframe/" + base_scheme + "://" + base_url + link["href"]
 
+            # test: remove js
+            all_scripts = bs.find_all("script")
+            for script in all_scripts:
+                script.extract()
+
             # fix absolute javascript
             all_scripts = bs.find_all("script", {"src": True})
             for script in all_scripts:
@@ -48,7 +56,8 @@ def iframe(request, url):
         html = final_html
 
     except Exception as e:
-        html = str(e)
+        logger.debug(e)
+        return HttpResponse("An error has occured", content_type=500)
     return HttpResponse(html, content_type=content_type)
 
 def dummy(request):
@@ -73,7 +82,7 @@ def setup(request, url):
 
 def newfeed(request):
     if request.method == 'POST':
-        if not "url" in request.POST or not "element" in request.POST or not "title" in request.POST or not "content" in request.POST:
+        if not "url" in request.POST or not request.POST["url"] or not "element" in request.POST or not request.POST["element"] or not "title" in request.POST or not request.POST["title"] or not "content" in request.POST or not request.POST["content"]:
             return HttpResponse("Error, missing required element")
         url = request.POST["url"]
         element = request.POST["element"]
@@ -114,6 +123,7 @@ def feed_delete(request, id):
         # demo website: disable deleting feeds
         if not request.get_host() == "hrss.hipstercat.fr:443":
             Feed.objects.get(pk=id).delete()
+            logger.info("Removed feed ID "+id)
             return redirect("/feeds")
         else:
             return HttpResponse("Deleting is disabled on demo website.", status=403)
@@ -123,6 +133,9 @@ def feed_delete(request, id):
 def rss(request, uurl):
     try:
         feed = Feed.objects.get(uurl=uurl)
-        return render(request, "feed.xml", {"feed": feed, "rss": fetch_feed(feed)}, content_type="application/rss+xml")
+        fetched = fetch_feed(feed)
+        if not fetched or not fetched["items"]:
+            return HttpResponse("Error: feed is empty. Did you set up 'element' field correctly?", status=422)
+        return render(request, "feed.xml", {"feed": feed, "rss": fetched}, content_type="application/rss+xml")
     except ObjectDoesNotExist:
-        return HttpResponse("nope")
+        return HttpResponse("Error: feed is unknown", status=404)