common.py

"""
This is the common settings file, intended to set sane defaults. If you have a
piece of configuration that's dependent on a set of feature flags being set,
then create a function that returns the calculated value based on the value of
MITX_FEATURES[...]. Modules that extend this one can change the feature
configuration in an environment specific config file and re-calculate those
values.

We should make a method that calls all these config methods so that you just 
make one call at the end of your site-specific dev file to reset all the
dependent variables (like INSTALLED_APPS) for you.

Longer TODO:
1. Right now our treatment of static content in general and in particular 
   course-specific static content is haphazard.
2. We should have a more disciplined approach to feature flagging, even if it
   just means that we stick them in a dict called MITX_FEATURES.
3. We need to handle configuration for multiple courses. This could be as 
   multiple sites, but we do need a way to map their data assets.
"""
import sys
import tempfile

import djcelery
from path import path

from askbotsettings import * # this is where LIVESETTINGS_OPTIONS comes from
import logsettings

################################### FEATURES ###################################
COURSEWARE_ENABLED = True
ASKBOT_ENABLED = True
GENERATE_RANDOM_USER_CREDENTIALS = False
PERFSTATS = False

# Features
MITX_FEATURES = {
    'SAMPLE' : False
}

# Used for A/B testing
DEFAULT_GROUPS = []

# If this is true, random scores will be generated for the purpose of debugging the profile graphs
GENERATE_PROFILE_SCORES = False

############################# SET PATH INFORMATION #############################
PROJECT_ROOT = path(__file__).abspath().dirname().dirname() # /mitxweb
ENV_ROOT = PROJECT_ROOT.dirname() # virtualenv dir /mitxweb is in
ASKBOT_ROOT = ENV_ROOT / "askbot-devel"
COURSES_ROOT = ENV_ROOT / "data"

# FIXME: To support multiple courses, we should walk the courses dir at startup
DATA_DIR = COURSES_ROOT

sys.path.append(ENV_ROOT)
sys.path.append(ASKBOT_ROOT)
sys.path.append(ASKBOT_ROOT / "askbot" / "deps")
sys.path.append(PROJECT_ROOT / 'djangoapps')
sys.path.append(PROJECT_ROOT / 'lib')

################################## MITXWEB #####################################
# This is where we stick our compiled template files. Most of the app uses Mako
# templates
MAKO_MODULE_DIR = tempfile.mkdtemp('mako')
MAKO_TEMPLATES = {}
MAKO_TEMPLATES['course'] = [DATA_DIR]
MAKO_TEMPLATES['sections'] = [DATA_DIR / 'sections']
MAKO_TEMPLATES['custom_tags'] = [DATA_DIR / 'custom_tags']
MAKO_TEMPLATES['main'] = [PROJECT_ROOT / 'templates', 
                          DATA_DIR / 'info',
                          DATA_DIR / 'problems']

# This is where Django Template lookup is defined. There are a few of these 
# still left lying around.
TEMPLATE_DIRS = (
    PROJECT_ROOT / "templates",
    DATA_DIR / "problems",
)

TEMPLATE_CONTEXT_PROCESSORS = (
    'django.core.context_processors.request',
    'askbot.context.application_settings',
    'django.contrib.messages.context_processors.messages',
    #'django.core.context_processors.i18n',
    'askbot.user_messages.context_processors.user_messages',#must be before auth
    'django.core.context_processors.auth', #this is required for admin
    'django.core.context_processors.csrf', #necessary for csrf protection
)


# FIXME: 
# We should have separate S3 staged URLs in case we need to make changes to 
# these assets and test them.
LIB_URL = '/static/js/'

# Dev machines shouldn't need the book
# BOOK_URL = '/static/book/'
BOOK_URL = 'https://mitxstatic.s3.amazonaws.com/book_images/' # For AWS deploys

# Configuration option for when we want to grab server error pages
STATIC_GRAB = False
DEV_CONTENT = True

# FIXME: Should we be doing this truncation?
TRACK_MAX_EVENT = 10000 
DEBUG_TRACK_LOG = False

############################### DJANGO BUILT-INS ###############################
# Change DEBUG/TEMPLATE_DEBUG in your environment settings files, not here
DEBUG = False
TEMPLATE_DEBUG = False

# Site info
SITE_ID = 1
SITE_NAME = "localhost:8000"
HTTPS = 'on'
ROOT_URLCONF = 'mitx.urls'
IGNORABLE_404_ENDS = ('favicon.ico')

# Email
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
DEFAULT_FROM_EMAIL = 'registration@mitx.mit.edu'
DEFAULT_FEEDBACK_EMAIL = 'feedback@mitx.mit.edu'
ADMINS = (
    ('MITx Admins', 'admin@mitx.mit.edu'),
)
MANAGERS = ADMINS

# Static content
STATIC_URL = '/static/'
ADMIN_MEDIA_PREFIX = '/static/admin/'
STATIC_ROOT = ENV_ROOT / "staticfiles" # We don't run collectstatic -- this is to appease askbot checks

# FIXME: We should iterate through the courses we have, adding the static 
#        contents for each of them. (Right now we just use symlinks.)
STATICFILES_DIRS = [
    PROJECT_ROOT / "static",
    ASKBOT_ROOT / "askbot" / "skins",

# This is how you would use the textbook images locally
#    ("book", ENV_ROOT / "book_images")
]

# Locale/Internationalization
TIME_ZONE = 'America/New_York' # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
LANGUAGE_CODE = 'en' # http://www.i18nguy.com/unicode/language-identifiers.html
USE_I18N = True
USE_L10N = True

# Messages
MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage'

#################################### AWS #######################################
# S3BotoStorage insists on a timeout for uploaded assets. We should make it 
# permanent instead, but rather than trying to figure out exactly where that
# setting is, I'm just bumping the expiration time to something absurd (100 
# years). This is only used if DEFAULT_FILE_STORAGE is overriden to use S3
# in the global settings.py
AWS_QUERYSTRING_EXPIRE = 10 * 365 * 24 * 60 * 60 # 10 years

################################### ASKBOT #####################################
ASKBOT_EXTRA_SKINS_DIR = ASKBOT_ROOT / "askbot" / "skins"
ASKBOT_ALLOWED_UPLOAD_FILE_TYPES = ('.jpg', '.jpeg', '.gif', '.bmp', '.png', '.tiff')
ASKBOT_MAX_UPLOAD_FILE_SIZE = 1024 * 1024 # result in bytes

CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True
ASKBOT_URL = 'discussion/'
LOGIN_REDIRECT_URL = '/'
LOGIN_URL = '/'

ALLOW_UNICODE_SLUGS = False
ASKBOT_USE_STACKEXCHANGE_URLS = False # mimic url scheme of stackexchange
ASKBOT_CSS_DEVEL = True

# Celery Settings
BROKER_TRANSPORT = "djkombu.transport.DatabaseTransport"
CELERY_ALWAYS_EAGER = True
djcelery.setup_loader()

################################# SIMPLEWIKI ###################################
SIMPLE_WIKI_REQUIRE_LOGIN_EDIT = True
SIMPLE_WIKI_REQUIRE_LOGIN_VIEW = False

################################# Middleware ###################################
# List of finder classes that know how to find static files in
# various locations.
STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
)

# List of callables that know how to import templates from various sources.
TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
    'askbot.skins.loaders.filesystem_load_template_source',
    # 'django.template.loaders.eggs.Loader',
)

MIDDLEWARE_CLASSES = (
    'util.middleware.ExceptionLoggingMiddleware',
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',

    # Instead of AuthenticationMiddleware, we use a cached backed version
    #'django.contrib.auth.middleware.AuthenticationMiddleware',
    'cache_toolbox.middleware.CacheBackedAuthenticationMiddleware',
    
    'django.contrib.messages.middleware.MessageMiddleware',
    'track.middleware.TrackMiddleware',
    'mitxmako.middleware.MakoMiddleware',

    'askbot.middleware.anon_user.ConnectToSessionMessagesMiddleware',
    'askbot.middleware.forum_mode.ForumModeMiddleware',
    'askbot.middleware.cancel.CancelActionMiddleware',
    'django.middleware.transaction.TransactionMiddleware',
    'askbot.middleware.view_log.ViewLogMiddleware',
    'askbot.middleware.spaceless.SpacelessMiddleware',
    # 'askbot.middleware.pagesize.QuestionsPageSizeMiddleware',
    # 'debug_toolbar.middleware.DebugToolbarMiddleware',
)

################################### APPS #######################################
INSTALLED_APPS = (
    # Standard ones that are always installed...
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.humanize',
    'django.contrib.messages',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.staticfiles',
    'south',

    # Our courseware
    'circuit',
    'courseware',
    'perfstats',
    'student',
    'static_template_view',
    'staticbook',
    'simplewiki',
    'track',
    'util',

    # For Askbot 
    'django.contrib.sitemaps',
    'django.contrib.admin',
    'django_countries',
    'djcelery',
    'djkombu',
    'askbot',
    'askbot.deps.livesettings',
    'followit',
    'keyedcache',
    'robots',
)