Fixed the errors that were breaking tests from unused simplewiki files and a…

Fixed the errors that were breaking tests from unused simplewiki files and a half-migrated certificates module.

lms/djangoapps/certificates/views.py

 import json
 import logging
-import settings
 import uuid
 
 from django.conf import settings

lms/djangoapps/simplewiki/views_attachments.py

-import os
-
-from django.contrib.auth.decorators import login_required
-from django.core.servers.basehttp import FileWrapper
-from django.db.models.fields.files import FieldFile
-from django.http import HttpResponse, HttpResponseForbidden, Http404
-from django.template import loader, Context
-
-from models import ArticleAttachment, get_attachment_filepath
-from views import check_permissions, fetch_from_url
-
-from wiki_settings import (
-    WIKI_ALLOW_ANON_ATTACHMENTS,
-    WIKI_ALLOW_ATTACHMENTS,
-    WIKI_ATTACHMENTS_MAX,
-    WIKI_ATTACHMENTS_ROOT,
-    WIKI_ATTACHMENTS_ALLOWED_EXTENSIONS,
-    WIKI_REQUIRE_LOGIN_VIEW,
-    WIKI_REQUIRE_LOGIN_EDIT,
-)
-
-
-def add_attachment(request, wiki_url):
-
-    (article, path, err) = fetch_from_url(request, wiki_url)
-    if err:
-        return err
-    
-    perm_err = check_permissions(request, article, check_write=True, check_locked=True)
-    if perm_err:
-        return perm_err
-    
-    if not WIKI_ALLOW_ATTACHMENTS or (not WIKI_ALLOW_ANON_ATTACHMENTS and request.user.is_anonymous()):
-        return HttpResponseForbidden()
-
-    if request.method == 'POST':
-        if request.FILES.__contains__('attachment'):            
-            attachment = ArticleAttachment()
-            if not request.user.is_anonymous():
-                attachment.uploaded_by = request.user
-            attachment.article = article
- 
-            file = request.FILES['attachment']
-            file_rel_path = get_attachment_filepath(attachment, file.name)
-            chunk_size = request.upload_handlers[0].chunk_size
-
-            filefield = FieldFile(attachment, attachment.file, file_rel_path)
-            attachment.file = filefield
-            
-            file_path = WIKI_ATTACHMENTS_ROOT + attachment.file.name
-
-            if not request.POST.__contains__('overwrite') and os.path.exists(file_path):
-                c = Context({'overwrite_warning' : True,
-                             'wiki_article': article,
-                             'filename': file.name})
-                t = loader.get_template('simplewiki_updateprogressbar.html')
-                return HttpResponse(t.render(c))
-
-            if file.size > WIKI_ATTACHMENTS_MAX:
-                c = Context({'too_big' : True,
-                             'max_size': WIKI_ATTACHMENTS_MAX,
-                             'wiki_article': article,
-                             'file': file})
-                t = loader.get_template('simplewiki_updateprogressbar.html')
-                return HttpResponse(t.render(c))
-                
-            def get_extension(fname):
-                return attachment.file.name.split('.')[-2]
-            if WIKI_ATTACHMENTS_ALLOWED_EXTENSIONS and not \
-               get_extension(attachment.file.name) in WIKI_ATTACHMENTS_ALLOWED_EXTENSIONS:
-                c = Context({'extension_err' : True,
-                             'extensions': WIKI_ATTACHMENTS_ALLOWED_EXTENSIONS,
-                             'wiki_article': article,
-                             'file': file})
-                t = loader.get_template('simplewiki_updateprogressbar.html')
-                return HttpResponse(t.render(c))
-
-            # Remove existing attachments
-            # TODO: Move this until AFTER having removed file.
-            # Current problem is that Django's FileField delete() method
-            # automatically deletes files
-            for a in article.attachments():
-                if file_rel_path == a.file.name:
-                    a.delete()
-            def receive_file():
-                destination = open(file_path, 'wb+')
-                size = file.size
-                cnt = 0
-                c = Context({'started' : True,})
-                t = loader.get_template('simplewiki_updateprogressbar.html')
-                yield t.render(c)
-                for chunk in file.chunks():
-                    cnt += 1
-                    destination.write(chunk)
-                    c = Context({'progress_width' : (cnt*chunk_size) / size,
-                                 'wiki_article': article,})
-                    t = loader.get_template('simplewiki_updateprogressbar.html')
-                    yield t.render(c)
-                c = Context({'finished' : True,
-                             'wiki_article': article,})
-                t = loader.get_template('simplewiki_updateprogressbar.html')
-                destination.close()
-                attachment.save()
-                yield t.render(c)
-
-            return HttpResponse(receive_file())
-
-    return HttpResponse('')
-
-# Taken from http://www.djangosnippets.org/snippets/365/
-def send_file(request, filepath):
-    """                                                                         
-    Send a file through Django without loading the whole file into              
-    memory at once. The FileWrapper will turn the file object into an           
-    iterator for chunks of 8KB.                                                 
-    """
-    filename =  filepath
-    wrapper = FileWrapper(file(filename))
-    response = HttpResponse(wrapper, content_type='text/plain')
-    response['Content-Length'] = os.path.getsize(filename)
-    return response
-
-def view_attachment(request, wiki_url, file_name):
-    
-    (article, path, err) = fetch_from_url(request, wiki_url)
-    if err:
-        return err
-    
-    perm_err = check_permissions(request, article, check_read=True)
-    if perm_err:
-        return perm_err
-    
-    attachment = None
-    for a in article.attachments():
-        if get_attachment_filepath(a, file_name) == a.file.name:
-            attachment = a
-    
-    if attachment:
-        filepath = WIKI_ATTACHMENTS_ROOT + attachment.file.name
-        if os.path.exists(filepath):
-            return send_file(request, filepath)
-
-    raise Http404()
-
-####################
-# LOGIN PROTECTION #
-####################
-
-if WIKI_REQUIRE_LOGIN_VIEW:
-    view_attachment = login_required(view_attachment)
-    
-if WIKI_REQUIRE_LOGIN_EDIT or not WIKI_ALLOW_ANON_ATTACHMENTS:
-    add_attachment  = login_required(add_attachment)