aws.py

"""
This is the default template for our main set of AWS servers.
"""

# We intentionally define lots of variables that aren't used, and
# want to import all variables from base settings files
# pylint: disable=W0401, W0614

import json

from .common import *

from logsettings import get_logger_config
import os

from path import path
from dealer.git import git
from xmodule.modulestore.modulestore_settings import convert_module_store_setting_if_needed

# SERVICE_VARIANT specifies name of the variant used, which decides what JSON
# configuration files are read during startup.
SERVICE_VARIANT = os.environ.get('SERVICE_VARIANT', None)

# CONFIG_ROOT specifies the directory where the JSON configuration
# files are expected to be found. If not specified, use the project
# directory.
CONFIG_ROOT = path(os.environ.get('CONFIG_ROOT', ENV_ROOT))

# CONFIG_PREFIX specifies the prefix of the JSON configuration files,
# based on the service variant. If no variant is use, don't use a
# prefix.
CONFIG_PREFIX = SERVICE_VARIANT + "." if SERVICE_VARIANT else ""


############### ALWAYS THE SAME ################################

DEBUG = False
TEMPLATE_DEBUG = False

EMAIL_BACKEND = 'django_ses.SESBackend'
SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'

###################################### CELERY  ################################

# Don't use a connection pool, since connections are dropped by ELB.
BROKER_POOL_LIMIT = 0
BROKER_CONNECTION_TIMEOUT = 1

# For the Result Store, use the django cache named 'celery'
CELERY_RESULT_BACKEND = 'cache'
CELERY_CACHE_BACKEND = 'celery'

# When the broker is behind an ELB, use a heartbeat to refresh the
# connection and to detect if it has been dropped.
BROKER_HEARTBEAT = 10.0
BROKER_HEARTBEAT_CHECKRATE = 2

# Each worker should only fetch one message at a time
CELERYD_PREFETCH_MULTIPLIER = 1

# Skip djcelery migrations, since we don't use the database as the broker
SOUTH_MIGRATION_MODULES = {
    'djcelery': 'ignore',
}

# Rename the exchange and queues for each variant

QUEUE_VARIANT = CONFIG_PREFIX.lower()

CELERY_DEFAULT_EXCHANGE = 'edx.{0}core'.format(QUEUE_VARIANT)

HIGH_PRIORITY_QUEUE = 'edx.{0}core.high'.format(QUEUE_VARIANT)
DEFAULT_PRIORITY_QUEUE = 'edx.{0}core.default'.format(QUEUE_VARIANT)
LOW_PRIORITY_QUEUE = 'edx.{0}core.low'.format(QUEUE_VARIANT)

CELERY_DEFAULT_QUEUE = DEFAULT_PRIORITY_QUEUE
CELERY_DEFAULT_ROUTING_KEY = DEFAULT_PRIORITY_QUEUE

CELERY_QUEUES = {
    HIGH_PRIORITY_QUEUE: {},
    LOW_PRIORITY_QUEUE: {},
    DEFAULT_PRIORITY_QUEUE: {}
}

############# NON-SECURE ENV CONFIG ##############################
# Things like server locations, ports, etc.
with open(CONFIG_ROOT / CONFIG_PREFIX + "env.json") as env_file:
    ENV_TOKENS = json.load(env_file)

# STATIC_URL_BASE specifies the base url to use for static files
STATIC_URL_BASE = ENV_TOKENS.get('STATIC_URL_BASE', None)
if STATIC_URL_BASE:
    # collectstatic will fail if STATIC_URL is a unicode string
    STATIC_URL = STATIC_URL_BASE.encode('ascii')
    if not STATIC_URL.endswith("/"):
        STATIC_URL += "/"
    STATIC_URL += git.revision + "/"

# GITHUB_REPO_ROOT is the base directory
# for course data
GITHUB_REPO_ROOT = ENV_TOKENS.get('GITHUB_REPO_ROOT', GITHUB_REPO_ROOT)

# STATIC_ROOT specifies the directory where static files are
# collected

STATIC_ROOT_BASE = ENV_TOKENS.get('STATIC_ROOT_BASE', None)
if STATIC_ROOT_BASE:
    STATIC_ROOT = path(STATIC_ROOT_BASE) / git.revision

EMAIL_BACKEND = ENV_TOKENS.get('EMAIL_BACKEND', EMAIL_BACKEND)
EMAIL_FILE_PATH = ENV_TOKENS.get('EMAIL_FILE_PATH', None)

EMAIL_HOST = ENV_TOKENS.get('EMAIL_HOST', EMAIL_HOST)
EMAIL_PORT = ENV_TOKENS.get('EMAIL_PORT', EMAIL_PORT)
EMAIL_USE_TLS = ENV_TOKENS.get('EMAIL_USE_TLS', EMAIL_USE_TLS)

LMS_BASE = ENV_TOKENS.get('LMS_BASE')
# Note that FEATURES['PREVIEW_LMS_BASE'] gets read in from the environment file.

SITE_NAME = ENV_TOKENS['SITE_NAME']

LOG_DIR = ENV_TOKENS['LOG_DIR']

CACHES = ENV_TOKENS['CACHES']
# Cache used for location mapping -- called many times with the same key/value
# in a given request.
if 'loc_cache' not in CACHES:
    CACHES['loc_cache'] = {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'edx_location_mem_cache',
    }

SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
SESSION_ENGINE = ENV_TOKENS.get('SESSION_ENGINE', SESSION_ENGINE)
SESSION_COOKIE_SECURE = ENV_TOKENS.get('SESSION_COOKIE_SECURE', SESSION_COOKIE_SECURE)

# allow for environments to specify what cookie name our login subsystem should use
# this is to fix a bug regarding simultaneous logins between edx.org and edge.edx.org which can
# happen with some browsers (e.g. Firefox)
if ENV_TOKENS.get('SESSION_COOKIE_NAME', None):
    # NOTE, there's a bug in Django (http://bugs.python.org/issue18012) which necessitates this being a str()
    SESSION_COOKIE_NAME = str(ENV_TOKENS.get('SESSION_COOKIE_NAME'))

#Email overrides
DEFAULT_FROM_EMAIL = ENV_TOKENS.get('DEFAULT_FROM_EMAIL', DEFAULT_FROM_EMAIL)
DEFAULT_FEEDBACK_EMAIL = ENV_TOKENS.get('DEFAULT_FEEDBACK_EMAIL', DEFAULT_FEEDBACK_EMAIL)
ADMINS = ENV_TOKENS.get('ADMINS', ADMINS)
SERVER_EMAIL = ENV_TOKENS.get('SERVER_EMAIL', SERVER_EMAIL)
MKTG_URLS = ENV_TOKENS.get('MKTG_URLS', MKTG_URLS)
TECH_SUPPORT_EMAIL = ENV_TOKENS.get('TECH_SUPPORT_EMAIL', TECH_SUPPORT_EMAIL)

COURSES_WITH_UNSAFE_CODE = ENV_TOKENS.get("COURSES_WITH_UNSAFE_CODE", [])

ASSET_IGNORE_REGEX = ENV_TOKENS.get('ASSET_IGNORE_REGEX', ASSET_IGNORE_REGEX)

# Theme overrides
THEME_NAME = ENV_TOKENS.get('THEME_NAME', None)

#Timezone overrides
TIME_ZONE = ENV_TOKENS.get('TIME_ZONE', TIME_ZONE)

# Push to LMS overrides
GIT_REPO_EXPORT_DIR = ENV_TOKENS.get('GIT_REPO_EXPORT_DIR', '/edx/var/edxapp/export_course_repos')

# Translation overrides
LANGUAGES = ENV_TOKENS.get('LANGUAGES', LANGUAGES)
LANGUAGE_CODE = ENV_TOKENS.get('LANGUAGE_CODE', LANGUAGE_CODE)
USE_I18N = ENV_TOKENS.get('USE_I18N', USE_I18N)

ENV_FEATURES = ENV_TOKENS.get('FEATURES', ENV_TOKENS.get('MITX_FEATURES', {}))
for feature, value in ENV_FEATURES.items():
    FEATURES[feature] = value

# Additional installed apps
for app in ENV_TOKENS.get('ADDL_INSTALLED_APPS', []):
    INSTALLED_APPS += (app,)

WIKI_ENABLED = ENV_TOKENS.get('WIKI_ENABLED', WIKI_ENABLED)

LOGGING = get_logger_config(LOG_DIR,
                            logging_env=ENV_TOKENS['LOGGING_ENV'],
                            debug=False,
                            service_variant=SERVICE_VARIANT)

#theming start:
PLATFORM_NAME = ENV_TOKENS.get('PLATFORM_NAME', 'edX')

# Event Tracking
if "TRACKING_IGNORE_URL_PATTERNS" in ENV_TOKENS:
    TRACKING_IGNORE_URL_PATTERNS = ENV_TOKENS.get("TRACKING_IGNORE_URL_PATTERNS")

# Django CAS external authentication settings
CAS_EXTRA_LOGIN_PARAMS = ENV_TOKENS.get("CAS_EXTRA_LOGIN_PARAMS", None)
if FEATURES.get('AUTH_USE_CAS'):
    CAS_SERVER_URL = ENV_TOKENS.get("CAS_SERVER_URL", None)
    AUTHENTICATION_BACKENDS = (
        'django.contrib.auth.backends.ModelBackend',
        'django_cas.backends.CASBackend',
    )
    INSTALLED_APPS += ('django_cas',)
    MIDDLEWARE_CLASSES += ('django_cas.middleware.CASMiddleware',)
    CAS_ATTRIBUTE_CALLBACK = ENV_TOKENS.get('CAS_ATTRIBUTE_CALLBACK', None)
    if CAS_ATTRIBUTE_CALLBACK:
        import importlib
        CAS_USER_DETAILS_RESOLVER = getattr(
            importlib.import_module(CAS_ATTRIBUTE_CALLBACK['module']),
            CAS_ATTRIBUTE_CALLBACK['function']
        )


################ SECURE AUTH ITEMS ###############################
# Secret things: passwords, access keys, etc.
with open(CONFIG_ROOT / CONFIG_PREFIX + "auth.json") as auth_file:
    AUTH_TOKENS = json.load(auth_file)

############### XBlock filesystem field config ##########
if 'XBLOCK_FS_STORAGE_BUCKET' in ENV_TOKENS:
    DJFS = {
        'type' : 's3fs',
        'bucket' : ENV_TOKENS.get('XBLOCK_FS_STORAGE_BUCKET', None),
        'prefix' : ENV_TOKENS.get('XBLOCK_FS_STORAGE_PREFIX', '/xblock-storage/'),
        'aws_access_key_id' : AUTH_TOKENS.get('AWS_ACCESS_KEY_ID', None),
        'aws_secret_access_key' : AUTH_TOKENS.get('AWS_SECRET_ACCESS_KEY', None)
    }

EMAIL_HOST_USER = AUTH_TOKENS.get('EMAIL_HOST_USER', EMAIL_HOST_USER)
EMAIL_HOST_PASSWORD = AUTH_TOKENS.get('EMAIL_HOST_PASSWORD', EMAIL_HOST_PASSWORD)

# If Segment.io key specified, load it and turn on Segment.io if the feature flag is set
# Note that this is the Studio key. There is a separate key for the LMS.
SEGMENT_IO_KEY = AUTH_TOKENS.get('SEGMENT_IO_KEY')
if SEGMENT_IO_KEY:
    FEATURES['SEGMENT_IO'] = ENV_TOKENS.get('SEGMENT_IO', False)

AWS_ACCESS_KEY_ID = AUTH_TOKENS["AWS_ACCESS_KEY_ID"]
if AWS_ACCESS_KEY_ID == "":
    AWS_ACCESS_KEY_ID = None

AWS_SECRET_ACCESS_KEY = AUTH_TOKENS["AWS_SECRET_ACCESS_KEY"]
if AWS_SECRET_ACCESS_KEY == "":
    AWS_SECRET_ACCESS_KEY = None

DATABASES = AUTH_TOKENS['DATABASES']
MODULESTORE = convert_module_store_setting_if_needed(AUTH_TOKENS.get('MODULESTORE', MODULESTORE))
CONTENTSTORE = AUTH_TOKENS['CONTENTSTORE']
DOC_STORE_CONFIG = AUTH_TOKENS['DOC_STORE_CONFIG']
# Datadog for events!
DATADOG = AUTH_TOKENS.get("DATADOG", {})
DATADOG.update(ENV_TOKENS.get("DATADOG", {}))

# TODO: deprecated (compatibility with previous settings)
if 'DATADOG_API' in AUTH_TOKENS:
    DATADOG['api_key'] = AUTH_TOKENS['DATADOG_API']

# Celery Broker
CELERY_ALWAYS_EAGER = ENV_TOKENS.get("CELERY_ALWAYS_EAGER", False)
CELERY_BROKER_TRANSPORT = ENV_TOKENS.get("CELERY_BROKER_TRANSPORT", "")
CELERY_BROKER_HOSTNAME = ENV_TOKENS.get("CELERY_BROKER_HOSTNAME", "")
CELERY_BROKER_VHOST = ENV_TOKENS.get("CELERY_BROKER_VHOST", "")
CELERY_BROKER_USER = AUTH_TOKENS.get("CELERY_BROKER_USER", "")
CELERY_BROKER_PASSWORD = AUTH_TOKENS.get("CELERY_BROKER_PASSWORD", "")

BROKER_URL = "{0}://{1}:{2}@{3}/{4}".format(CELERY_BROKER_TRANSPORT,
                                            CELERY_BROKER_USER,
                                            CELERY_BROKER_PASSWORD,
                                            CELERY_BROKER_HOSTNAME,
                                            CELERY_BROKER_VHOST)

# Event tracking
TRACKING_BACKENDS.update(AUTH_TOKENS.get("TRACKING_BACKENDS", {}))
EVENT_TRACKING_BACKENDS.update(AUTH_TOKENS.get("EVENT_TRACKING_BACKENDS", {}))

SUBDOMAIN_BRANDING = ENV_TOKENS.get('SUBDOMAIN_BRANDING', {})
VIRTUAL_UNIVERSITIES = ENV_TOKENS.get('VIRTUAL_UNIVERSITIES', [])

##### ACCOUNT LOCKOUT DEFAULT PARAMETERS #####
MAX_FAILED_LOGIN_ATTEMPTS_ALLOWED = ENV_TOKENS.get("MAX_FAILED_LOGIN_ATTEMPTS_ALLOWED", 5)
MAX_FAILED_LOGIN_ATTEMPTS_LOCKOUT_PERIOD_SECS = ENV_TOKENS.get("MAX_FAILED_LOGIN_ATTEMPTS_LOCKOUT_PERIOD_SECS", 15 * 60)

MICROSITE_CONFIGURATION = ENV_TOKENS.get('MICROSITE_CONFIGURATION', {})
MICROSITE_ROOT_DIR = path(ENV_TOKENS.get('MICROSITE_ROOT_DIR', ''))

#### PASSWORD POLICY SETTINGS #####
PASSWORD_MIN_LENGTH = ENV_TOKENS.get("PASSWORD_MIN_LENGTH")
PASSWORD_MAX_LENGTH = ENV_TOKENS.get("PASSWORD_MAX_LENGTH")
PASSWORD_COMPLEXITY = ENV_TOKENS.get("PASSWORD_COMPLEXITY", {})
PASSWORD_DICTIONARY_EDIT_DISTANCE_THRESHOLD = ENV_TOKENS.get("PASSWORD_DICTIONARY_EDIT_DISTANCE_THRESHOLD")
PASSWORD_DICTIONARY = ENV_TOKENS.get("PASSWORD_DICTIONARY", [])

### INACTIVITY SETTINGS ####
SESSION_INACTIVITY_TIMEOUT_IN_SECONDS = AUTH_TOKENS.get("SESSION_INACTIVITY_TIMEOUT_IN_SECONDS")

##### X-Frame-Options response header settings #####
X_FRAME_OPTIONS = ENV_TOKENS.get('X_FRAME_OPTIONS', X_FRAME_OPTIONS)

##### ADVANCED_SECURITY_CONFIG #####
ADVANCED_SECURITY_CONFIG = ENV_TOKENS.get('ADVANCED_SECURITY_CONFIG', {})

################ ADVANCED COMPONENT/PROBLEM TYPES ###############

ADVANCED_COMPONENT_TYPES = ENV_TOKENS.get('ADVANCED_COMPONENT_TYPES', ADVANCED_COMPONENT_TYPES)
ADVANCED_PROBLEM_TYPES = ENV_TOKENS.get('ADVANCED_PROBLEM_TYPES', ADVANCED_PROBLEM_TYPES)