Replace abort() to pass exception info to error pages.

r2/r2/config/middleware.py

@@ -69,6 +69,11 @@ def error_mapper(code, message, environ, global_conf=None, **kw):
     if code in codes:
         # StatusBasedForward expects a relative URL (no SCRIPT_NAME)
         d = dict(code = code, message = message)
+
+        exception = environ.get('r2.controller.exception')
+        if exception:
+            d['explanation'] = exception.explanation
+
         if environ.get('REDDIT_CNAME'):
             d['cnameframe'] = 1
         if environ.get('REDDIT_NAME'):

r2/r2/controllers/error.py

@@ -116,7 +116,8 @@ def send403(self):
         else:
             res = pages.RedditError(
                 title=_("forbidden (%(domain)s)") % dict(domain=g.domain),
-                message=_("you are not allowed to do that"))
+                message=_("you are not allowed to do that"),
+                explanation=request.GET.get('explanation'))
             return res.render()
 
     def send404(self):

r2/r2/controllers/errors.py

@@ -20,12 +20,14 @@
 # Inc. All Rights Reserved.
 ###############################################################################
 
+from paste.httpexceptions import HTTPForbidden
 from r2.lib.utils import Storage, tup
 from pylons.i18n import _
 from copy import copy
 
 error_list = dict((
         ('USER_REQUIRED', _("please login to do that")),
+        ('HTTPS_REQUIRED', _("this page must be accessed using https")),
         ('VERIFIED_USER_REQUIRED', _("you need to set a valid email address to do that.")),
         ('NO_URL', _('a url is required')),
         ('BAD_URL', _('you should check that url')),
@@ -161,6 +163,11 @@ def remove(self, pair):
         if self.errors.has_key(pair):
             del self.errors[pair]
 
+class ForbiddenError(HTTPForbidden):
+    def __init__(self, error):
+        HTTPForbidden.__init__(self)
+        self.explanation = error_list[error]
+
 class UserRequiredException(Exception): pass
 class VerifiedUserRequiredException(Exception): pass
 class GoldRequiredException(Exception): pass

r2/r2/controllers/reddit_base.py

@@ -22,22 +22,23 @@
 
 from mako.filters import url_escape
 from pylons import c, g, request
-from pylons.controllers.util import abort, redirect_to
+from pylons.controllers.util import redirect_to
 from pylons.i18n import _
 from pylons.i18n.translation import LanguageError
-from r2.lib.base import BaseController, proxyurl
 from r2.lib import pages, utils, filters, amqp, stats
 from r2.lib.utils import http_utils, is_subdomain, UniqueIterator, is_throttled
 from r2.lib.cache import LocalCache, make_key, MemcachedError
 import random as rand
 from r2.models.account import valid_cookie, FakeAccount, valid_feed, valid_admin_cookie
 from r2.models.subreddit import Subreddit, Frontpage
 from r2.models import *
-from errors import ErrorSet
+from errors import ErrorSet, ForbiddenError, errors
 from validator import *
 from r2.lib.template_helpers import add_sr
 from r2.config.extensions import is_api
 from r2.lib.translation import set_lang
+from r2.lib.contrib import ipaddress
+from r2.lib.base import BaseController, proxyurl, abort
 
 from Cookie import CookieError
 from copy import copy
@@ -544,7 +545,7 @@ def cross_domain_handler(self, *args, **kwargs):
 
 def require_https():
     if not c.secure:
-        abort(403)
+        abort(ForbiddenError(errors.HTTPS_REQUIRED))
 
 def prevent_framing_and_css(allow_cname_frame=False):
     def wrap(f):

r2/r2/lib/base.py

@@ -26,8 +26,8 @@
 
 from pylons import Response, c, g, request, session, config
 from pylons.controllers import WSGIController, Controller
-from pylons.controllers.util import abort
 from pylons.i18n import N_, _, ungettext, get_lang
+from paste import httpexceptions
 from r2.lib.utils import to_js
 from r2.lib.filters import spaceCompress, _force_unicode
 from r2.lib.template_helpers import get_domain
@@ -63,6 +63,22 @@ def is_local_address(ip):
     # TODO: support the /20 and /24 private networks? make this configurable?
     return ip.startswith('10.')
 
+def abort(code_or_exception=None, detail="", headers=None, comment=None):
+    """Raise an HTTPException and save it in environ for use by error pages."""
+    # Pylons 0.9.6 makes it really hard to get your raised HTTPException,
+    # so this helper implements it manually using a familiar syntax.
+    # FIXME: when we upgrade Pylons, we can replace this with raise
+    #        and access environ['pylons.controller.exception']
+    if isinstance(code_or_exception, httpexceptions.HTTPException):
+        exc = code_or_exception
+    else:
+        if type(code_or_exception) is type and issubclass(code_or_exception, httpexceptions.HTTPException):
+            exc_cls = code_or_exception
+        else:
+            exc_cls = httpexceptions.get_exception(code_or_exception)
+        exc = exc_cls(detail, headers, comment)
+    request.environ['r2.controller.exception'] = exc
+    raise exc
 
 class BaseController(WSGIController):
     def try_pagecache(self):

r2/r2/lib/pages/pages.py

@@ -1380,26 +1380,32 @@ def __init__(self, client, *args, **kwargs):
 
 class RedditError(BoringPage):
     site_tracking = False
-    def __init__(self, title, message, image=None, sr_description=None):
+    def __init__(self, title, message, image=None, sr_description=None,
+                 explanation=None):
         BoringPage.__init__(self, title, loginbox=False,
-                            show_sidebar = False,
+                            show_sidebar = False, 
                             content=ErrorPage(title=title,
                                               message=message,
                                               image=image,
-                                              sr_description=sr_description))
+                                              sr_description=sr_description,
+                                              explanation=explanation))
 
 class ErrorPage(Templated):
     """Wrapper for an error message"""
-    def __init__(self, title, message, image=None, **kwargs):
+    def __init__(self, title, message, image=None, explanation=None, **kwargs):
         if not image:
             letter = random.choice(['a', 'b', 'c', 'd', 'e'])
             image = 'reddit404' + letter + '.png'
+        # Normalize explanation strings.
+        if explanation:
+            explanation = explanation.lower().rstrip('.') + '.'
         Templated.__init__(self,
                            title=title,
                            message=message,
                            image_url=image,
+                           explanation=explanation,
                            **kwargs)
-    
+
 
 class Over18(Templated):
     """The creepy 'over 18' check page for nsfw content."""

r2/r2/templates/errorpage.html

@@ -31,6 +31,9 @@
   <h1>${thing.title}</h1>
   <div class="errorpage-message">
   ${unsafe(safemarkdown(thing.message, wrap=False))}
+  %if thing.explanation:
+    &mdash; ${thing.explanation}
+  %endif
   </div>
 
   % if thing.sr_description: