zulip/zproject/settings.py

# Django settings for zulip project.
########################################################################
# Here's how settings for the Zulip project work:
#
# * settings.py contains non-site-specific and settings configuration
# for the Zulip Django app.
# * settings.py imports prod_settings.py, and any site-specific configuration
# belongs there.  The template for prod_settings.py is prod_settings_template.py
#
# See https://zulip.readthedocs.io/en/latest/subsystems/settings.html for more information
#
########################################################################
from copy import deepcopy
import os
import time
import sys
from typing import Any, Dict, List, Union
from urllib.parse import urljoin

from zerver.lib.db import TimeTrackingConnection
import zerver.lib.logging_util

########################################################################
# INITIAL SETTINGS
########################################################################

from .config import DEPLOY_ROOT, PRODUCTION, DEVELOPMENT, get_secret, get_config, get_from_file_if_exists

# Make this unique, and don't share it with anybody.
SECRET_KEY = get_secret("secret_key")

# A shared secret, used to authenticate different parts of the app to each other.
SHARED_SECRET = get_secret("shared_secret")

# We use this salt to hash a user's email into a filename for their user-uploaded
# avatar.  If this salt is discovered, attackers will only be able to determine
# that the owner of an email account has uploaded an avatar to Zulip, which isn't
# the end of the world.  Don't use the salt where there is more security exposure.
AVATAR_SALT = get_secret("avatar_salt")

# SERVER_GENERATION is used to track whether the server has been
# restarted for triggering browser clients to reload.
SERVER_GENERATION = int(time.time())

# Key to authenticate this server to zulip.org for push notifications, etc.
ZULIP_ORG_KEY = get_secret("zulip_org_key")
ZULIP_ORG_ID = get_secret("zulip_org_id")

if 'DEBUG' not in globals():
    # Uncomment end of next line to test CSS minification.
    # For webpack JS minification use tools/run_dev.py --minify
    DEBUG = DEVELOPMENT  # and platform.node() != 'your-machine'

if DEBUG:
    INTERNAL_IPS = ('127.0.0.1',)

# Detect whether we're running as a queue worker; this impacts the logging configuration.
if len(sys.argv) > 2 and sys.argv[0].endswith('manage.py') and sys.argv[1] == 'process_queue':
    IS_WORKER = True
else:
    IS_WORKER = False


# This is overridden in test_settings.py for the test suites
TEST_SUITE = False
# The new user tutorial is enabled by default, but disabled for client tests.
TUTORIAL_ENABLED = True
# This is overridden in test_settings.py for the test suites
CASPER_TESTS = False
# This is overridden in test_settings.py for the test suites
RUNNING_OPENAPI_CURL_TEST = False
# This is overridden in test_settings.py for the test suites
GENERATE_STRIPE_FIXTURES = False

# Google Compute Engine has an /etc/boto.cfg that is "nicely
# configured" to work with GCE's storage service.  However, their
# configuration is super aggressive broken, in that it means importing
# boto in a virtualenv that doesn't contain the GCE tools crashes.
#
# By using our own path for BOTO_CONFIG, we can cause boto to not
# process /etc/boto.cfg.
os.environ['BOTO_CONFIG'] = '/etc/zulip/boto.cfg'

########################################################################
# DEFAULT VALUES FOR SETTINGS
########################################################################

# For any settings that are not set in the site-specific configuration file
# (/etc/zulip/settings.py in production, or dev_settings.py or test_settings.py
# in dev and test), we want to initialize them to sane defaults.
from .default_settings import *

# Import variables like secrets from the prod_settings file
# Import prod_settings after determining the deployment/machine type
if PRODUCTION:
    from .prod_settings import *
else:
    from .dev_settings import *

# These are the settings that we will check that the user has filled in for
# production deployments before starting the app.  It consists of a series
# of pairs of (setting name, default value that it must be changed from)
REQUIRED_SETTINGS = [("EXTERNAL_HOST", "zulip.example.com"),
                     ("ZULIP_ADMINISTRATOR", "zulip-admin@example.com"),
                     # SECRET_KEY doesn't really need to be here, in
                     # that we set it automatically, but just in
                     # case, it seems worth having in this list
                     ("SECRET_KEY", ""),
                     ("AUTHENTICATION_BACKENDS", ()),
                     ]

MANAGERS = ADMINS

########################################################################
# STANDARD DJANGO SETTINGS
########################################################################

# Local time zone for this installation. Choices can be found here:
# https://en.wikipedia.org/wiki/List_of_tz_zones_by_name
# although not all choices may be available on all operating systems.
# In a Windows environment this must be set to your system time zone.
TIME_ZONE = 'UTC'

# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en-us'

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale.
USE_L10N = True

# If you set this to False, Django will not use timezone-aware datetimes.
USE_TZ = True

# this directory will be used to store logs for development environment
DEVELOPMENT_LOG_DIRECTORY = os.path.join(DEPLOY_ROOT, 'var', 'log')
# Make redirects work properly behind a reverse proxy
USE_X_FORWARDED_HOST = True

# Extend ALLOWED_HOSTS with localhost (needed to RPC to Tornado),
ALLOWED_HOSTS += ['127.0.0.1', 'localhost']
# ... with hosts corresponding to EXTERNAL_HOST,
ALLOWED_HOSTS += [EXTERNAL_HOST.split(":")[0],
                  '.' + EXTERNAL_HOST.split(":")[0]]
# ... and with the hosts in REALM_HOSTS.
ALLOWED_HOSTS += REALM_HOSTS.values()

from django.template.loaders import app_directories
class TwoFactorLoader(app_directories.Loader):
    def get_dirs(self) -> List[str]:
        dirs = super().get_dirs()
        return [d for d in dirs if 'two_factor' in d]

MIDDLEWARE = (
    # With the exception of it's dependencies,
    # our logging middleware should be the top middleware item.
    'zerver.middleware.TagRequests',
    'zerver.middleware.SetRemoteAddrFromForwardedFor',
    'zerver.middleware.LogRequests',
    'zerver.middleware.JsonErrorHandler',
    'zerver.middleware.RateLimitMiddleware',
    'zerver.middleware.FlushDisplayRecipientCache',
    'zerver.middleware.ZulipCommonMiddleware',
    'zerver.middleware.HostDomainMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    # Make sure 2FA middlewares come after authentication middleware.
    'django_otp.middleware.OTPMiddleware',  # Required by Two Factor auth.
    'two_factor.middleware.threadlocals.ThreadLocals',  # Required by Twilio
    # Needs to be after CommonMiddleware, which sets Content-Length
    'zerver.middleware.FinalizeOpenGraphDescription',
)

ANONYMOUS_USER_ID = None

AUTH_USER_MODEL = "zerver.UserProfile"

TEST_RUNNER = 'zerver.lib.test_runner.Runner'

ROOT_URLCONF = 'zproject.urls'

# Python dotted path to the WSGI application used by Django's runserver.
WSGI_APPLICATION = 'zproject.wsgi.application'

# A site can include additional installed apps via the
# EXTRA_INSTALLED_APPS setting
INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.staticfiles',
    'confirmation',
    'webpack_loader',
    'zerver',
    'social_django',
    # 2FA related apps.
    'django_otp',
    'django_otp.plugins.otp_static',
    'django_otp.plugins.otp_totp',
    'two_factor',
]
if USING_PGROONGA:
    INSTALLED_APPS += ['pgroonga']
INSTALLED_APPS += EXTRA_INSTALLED_APPS

ZILENCER_ENABLED = 'zilencer' in INSTALLED_APPS
CORPORATE_ENABLED = 'corporate' in INSTALLED_APPS

# Base URL of the Tornado server
# We set it to None when running backend tests or populate_db.
# We override the port number when running frontend tests.
TORNADO_PROCESSES = int(get_config('application_server', 'tornado_processes', '1'))
TORNADO_SERVER = 'http://127.0.0.1:9993'  # type: Optional[str]
RUNNING_INSIDE_TORNADO = False
AUTORELOAD = DEBUG

SILENCED_SYSTEM_CHECKS = [
    # auth.W004 checks that the UserProfile field named by USERNAME_FIELD has
    # `unique=True`.  For us this is `email`, and it's unique only per-realm.
    # Per Django docs, this is perfectly fine so long as our authentication
    # backends support the username not being unique; and they do.
    # See: https://docs.djangoproject.com/en/2.2/topics/auth/customizing/#django.contrib.auth.models.CustomUser.USERNAME_FIELD
    "auth.W004",
]

########################################################################
# DATABASE CONFIGURATION
########################################################################

# Zulip's Django configuration supports 4 different ways to do
# postgres authentication:
#
# * The development environment uses the `local_database_password`
#   secret from `zulip-secrets.conf` to authenticate with a local
#   database.  The password is automatically generated and managed by
#   `generate_secrets.py` during or provision.
#
# The remaining 3 options are for production use:
#
# * Using postgres' "peer" authentication to authenticate to a
#   database on the local system using one's user ID (processes
#   running as user `zulip` on the system are automatically
#   authenticated as database user `zulip`).  This is the default in
#   production.  We don't use this in the development environment,
#   because it requires the developer's user to be called `zulip`.
#
# * Using password authentication with a remote postgres server using
#   the `REMOTE_POSTGRES_HOST` setting and the password from the
#   `postgres_password` secret.
#
# * Using passwordless authentication with a remote postgres server
#   using the `REMOTE_POSTGRES_HOST` setting and a client certificate
#   under `/home/zulip/.postgresql/`.
#
# We implement these options with a default DATABASES configuration
# supporting peer authentication, with logic to override it as
# appropriate if DEVELOPMENT or REMOTE_POSTGRES_HOST is set.
DATABASES = {"default": {
    'ENGINE': 'django.db.backends.postgresql',
    'NAME': 'zulip',
    'USER': 'zulip',
    # Password = '' => peer/certificate authentication (no password)
    'PASSWORD': '',
    # Host = '' => connect to localhost by default
    'HOST': '',
    'SCHEMA': 'zulip',
    'CONN_MAX_AGE': 600,
    'OPTIONS': {
        'connection_factory': TimeTrackingConnection
    },
}}  # type: Dict[str, Dict[str, Any]]

if DEVELOPMENT:
    LOCAL_DATABASE_PASSWORD = get_secret("local_database_password")
    DATABASES["default"].update({
        'PASSWORD': LOCAL_DATABASE_PASSWORD,
        'HOST': 'localhost'
    })
elif REMOTE_POSTGRES_HOST != '':
    DATABASES['default'].update({
        'HOST': REMOTE_POSTGRES_HOST,
        'PORT': REMOTE_POSTGRES_PORT
    })
    if get_secret("postgres_password") is not None:
        DATABASES['default'].update({
            'PASSWORD': get_secret("postgres_password"),
        })
    if REMOTE_POSTGRES_SSLMODE != '':
        DATABASES['default']['OPTIONS']['sslmode'] = REMOTE_POSTGRES_SSLMODE
    else:
        DATABASES['default']['OPTIONS']['sslmode'] = 'verify-full'

POSTGRES_MISSING_DICTIONARIES = bool(get_config('postgresql', 'missing_dictionaries', None))

########################################################################
# RABBITMQ CONFIGURATION
########################################################################

USING_RABBITMQ = True
RABBITMQ_PASSWORD = get_secret("rabbitmq_password")

########################################################################
# CACHING CONFIGURATION
########################################################################

SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"

# Compress large values being stored in memcached; this is important
# for at least the realm_users cache.
PYLIBMC_MIN_COMPRESS_LEN = 100 * 1024
PYLIBMC_COMPRESS_LEVEL = 1

MEMCACHED_PASSWORD = get_secret("memcached_password")

CACHES = {
    'default': {
        'BACKEND': 'django_pylibmc.memcached.PyLibMCCache',
        'LOCATION': MEMCACHED_LOCATION,
        'TIMEOUT': 3600,
        'BINARY': True,
        'USERNAME': MEMCACHED_USERNAME,
        'PASSWORD': MEMCACHED_PASSWORD,
        'OPTIONS': {
            'tcp_nodelay': True,
            'retry_timeout': 1,
        }
    },
    'database': {
        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
        'LOCATION': 'third_party_api_results',
        # This cache shouldn't timeout; we're really just using the
        # cache API to store the results of requests to third-party
        # APIs like the Twitter API permanently.
        'TIMEOUT': None,
        'OPTIONS': {
            'MAX_ENTRIES': 100000000,
            'CULL_FREQUENCY': 10,
        }
    },
    'in-memory': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    },
}

########################################################################
# REDIS-BASED RATE LIMITING CONFIGURATION
########################################################################

RATE_LIMITING_RULES = {
    'api_by_user': [
        (60, 200),  # 200 requests max every minute
    ],
    'authenticate_by_username': [
        (1800, 5),  # 5 login attempts within 30 minutes
    ],
    'password_reset_form_by_email': [
        (3600, 2),  # 2 reset emails per hour
        (86400, 5),  # 5 per day
    ],
}

RATE_LIMITING_MIRROR_REALM_RULES = [
    (60, 50),  # 50 emails per minute
    (300, 120),  # 120 emails per 5 minutes
    (3600, 600),  # 600 emails per hour
]

DEBUG_RATE_LIMITING = DEBUG
REDIS_PASSWORD = get_secret('redis_password')

########################################################################
# SECURITY SETTINGS
########################################################################

SESSION_COOKIE_SAMESITE = 'Lax'

# Tell the browser to never send our cookies without encryption, e.g.
# when executing the initial http -> https redirect.
#
# Turn it off for local testing because we don't have SSL.
if PRODUCTION:
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True

    # https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-05#section-4.1.3.2
    SESSION_COOKIE_NAME = "__Host-sessionid"
    CSRF_COOKIE_NAME = "__Host-csrftoken"

# Prevent Javascript from reading the CSRF token from cookies.  Our code gets
# the token from the DOM, which means malicious code could too.  But hiding the
# cookie will slow down some attackers.
CSRF_COOKIE_HTTPONLY = True
CSRF_FAILURE_VIEW = 'zerver.middleware.csrf_failure'

if DEVELOPMENT:
    # Use fast password hashing for creating testing users when not
    # PRODUCTION.  Saves a bunch of time.
    PASSWORD_HASHERS = (
        'django.contrib.auth.hashers.SHA1PasswordHasher',
        'django.contrib.auth.hashers.PBKDF2PasswordHasher'
    )
    # Also we auto-generate passwords for the default users which you
    # can query using ./manage.py print_initial_password
    INITIAL_PASSWORD_SALT = get_secret("initial_password_salt")
else:
    # For production, use the best password hashing algorithm: Argon2
    # Zulip was originally on PBKDF2 so we need it for compatibility
    PASSWORD_HASHERS = ('django.contrib.auth.hashers.Argon2PasswordHasher',
                        'django.contrib.auth.hashers.PBKDF2PasswordHasher')

########################################################################
# API/BOT SETTINGS
########################################################################

ROOT_DOMAIN_URI = EXTERNAL_URI_SCHEME + EXTERNAL_HOST

if "NAGIOS_BOT_HOST" not in vars():
    NAGIOS_BOT_HOST = EXTERNAL_HOST

S3_KEY = get_secret("s3_key")
S3_SECRET_KEY = get_secret("s3_secret_key")

if LOCAL_UPLOADS_DIR is not None:
    if SENDFILE_BACKEND is None:
        SENDFILE_BACKEND = 'django_sendfile.backends.nginx'
    SENDFILE_ROOT = os.path.join(LOCAL_UPLOADS_DIR, "files")
    SENDFILE_URL = '/serve_uploads'

# GCM tokens are IP-whitelisted; if we deploy to additional
# servers you will need to explicitly add their IPs here:
# https://cloud.google.com/console/project/apps~zulip-android/apiui/credential
ANDROID_GCM_API_KEY = get_secret("android_gcm_api_key")

DROPBOX_APP_KEY = get_secret("dropbox_app_key")

MAILCHIMP_API_KEY = get_secret("mailchimp_api_key")

# Twitter API credentials
# Secrecy not required because its only used for R/O requests.
# Please don't make us go over our rate limit.
TWITTER_CONSUMER_KEY = get_secret("twitter_consumer_key")
TWITTER_CONSUMER_SECRET = get_secret("twitter_consumer_secret")
TWITTER_ACCESS_TOKEN_KEY = get_secret("twitter_access_token_key")
TWITTER_ACCESS_TOKEN_SECRET = get_secret("twitter_access_token_secret")

# These are the bots that Zulip sends automated messages as.
INTERNAL_BOTS = [{'var_name': 'NOTIFICATION_BOT',
                  'email_template': 'notification-bot@%s',
                  'name': 'Notification Bot'},
                 {'var_name': 'EMAIL_GATEWAY_BOT',
                  'email_template': 'emailgateway@%s',
                  'name': 'Email Gateway'},
                 {'var_name': 'NAGIOS_SEND_BOT',
                  'email_template': 'nagios-send-bot@%s',
                  'name': 'Nagios Send Bot'},
                 {'var_name': 'NAGIOS_RECEIVE_BOT',
                  'email_template': 'nagios-receive-bot@%s',
                  'name': 'Nagios Receive Bot'},
                 {'var_name': 'WELCOME_BOT',
                  'email_template': 'welcome-bot@%s',
                  'name': 'Welcome Bot'}]

# Bots that are created for each realm like the reminder-bot goes here.
REALM_INTERNAL_BOTS = []  # type: List[Dict[str, str]]
# These are realm-internal bots that may exist in some organizations,
# so configure power the setting, but should not be auto-created at this time.
DISABLED_REALM_INTERNAL_BOTS = [
    {'var_name': 'REMINDER_BOT',
     'email_template': 'reminder-bot@%s',
     'name': 'Reminder Bot'}
]

if PRODUCTION:
    INTERNAL_BOTS += [
        {'var_name': 'NAGIOS_STAGING_SEND_BOT',
         'email_template': 'nagios-staging-send-bot@%s',
         'name': 'Nagios Staging Send Bot'},
        {'var_name': 'NAGIOS_STAGING_RECEIVE_BOT',
         'email_template': 'nagios-staging-receive-bot@%s',
         'name': 'Nagios Staging Receive Bot'},
    ]

INTERNAL_BOT_DOMAIN = "zulip.com"

# Set the realm-specific bot names
for bot in INTERNAL_BOTS + REALM_INTERNAL_BOTS + DISABLED_REALM_INTERNAL_BOTS:
    if vars().get(bot['var_name']) is None:
        bot_email = bot['email_template'] % (INTERNAL_BOT_DOMAIN,)
        vars()[bot['var_name']] = bot_email

########################################################################
# STATSD CONFIGURATION
########################################################################

# Statsd is not super well supported; if you want to use it you'll need
# to set STATSD_HOST and STATSD_PREFIX.
if STATSD_HOST != '':
    INSTALLED_APPS += ['django_statsd']
    STATSD_PORT = 8125
    STATSD_CLIENT = 'django_statsd.clients.normal'

########################################################################
# CAMO HTTPS CACHE CONFIGURATION
########################################################################

if CAMO_URI != '':
    # This needs to be synced with the Camo installation
    CAMO_KEY = get_secret("camo_key")

########################################################################
# STATIC CONTENT AND MINIFICATION SETTINGS
########################################################################

if PRODUCTION or os.getenv('EXTERNAL_HOST') is not None:
    STATIC_URL = urljoin(ROOT_DOMAIN_URI, '/static/')
else:
    STATIC_URL = 'http://localhost:9991/static/'

# ZulipStorage is a modified version of ManifestStaticFilesStorage,
# and, like that class, it inserts a file hash into filenames
# to prevent the browser from using stale files from cache.
#
# Unlike PipelineStorage, it requires the files to exist in
# STATIC_ROOT even for dev servers.  So we only use
# ZulipStorage when not DEBUG.

if not DEBUG:
    STATICFILES_STORAGE = 'zerver.lib.storage.ZulipStorage'
    if PRODUCTION:
        STATIC_ROOT = '/home/zulip/prod-static'
    else:
        STATIC_ROOT = os.path.abspath(os.path.join(DEPLOY_ROOT, 'prod-static/serve'))

# If changing this, you need to also the hack modifications to this in
# our compilemessages management command.
LOCALE_PATHS = (os.path.join(DEPLOY_ROOT, 'locale'),)

# We want all temporary uploaded files to be stored on disk.
FILE_UPLOAD_MAX_MEMORY_SIZE = 0

STATICFILES_DIRS = ['static/']

if DEBUG:
    WEBPACK_STATS_FILE = os.path.join('var', 'webpack-stats-dev.json')
else:
    WEBPACK_STATS_FILE = 'webpack-stats-production.json'
WEBPACK_LOADER = {
    'DEFAULT': {
        'CACHE': not DEBUG,
        'BUNDLE_DIR_NAME': '../webpack/' if DEBUG else 'webpack-bundles/',
        'STATS_FILE': os.path.join(DEPLOY_ROOT, WEBPACK_STATS_FILE),
    }
}

########################################################################
# TEMPLATES SETTINGS
########################################################################

# List of callables that know how to import templates from various sources.
LOADERS = [
    'django.template.loaders.filesystem.Loader',
    'django.template.loaders.app_directories.Loader',
]  # type: List[Union[str, Tuple[object, ...]]]
if PRODUCTION:
    # Template caching is a significant performance win in production.
    LOADERS = [('django.template.loaders.cached.Loader', LOADERS)]

base_template_engine_settings = {
    'BACKEND': 'django.template.backends.jinja2.Jinja2',
    'OPTIONS': {
        'environment': 'zproject.jinja2.environment',
        'extensions': [
            'jinja2.ext.i18n',
            'jinja2.ext.autoescape',
            'webpack_loader.contrib.jinja2ext.WebpackExtension',
        ],
        'context_processors': [
            'zerver.context_processors.zulip_default_context',
            'django.template.context_processors.i18n',
        ],
    },
}  # type: Dict[str, Any]

default_template_engine_settings = deepcopy(base_template_engine_settings)
default_template_engine_settings.update({
    'NAME': 'Jinja2',
    'DIRS': [
        # The main templates directory
        os.path.join(DEPLOY_ROOT, 'templates'),
        # The webhook integration templates
        os.path.join(DEPLOY_ROOT, 'zerver', 'webhooks'),
        # The python-zulip-api:zulip_bots package templates
        os.path.join('static' if DEBUG else STATIC_ROOT, 'generated', 'bots'),
    ],
    'APP_DIRS': True,
})

non_html_template_engine_settings = deepcopy(base_template_engine_settings)
non_html_template_engine_settings.update({
    'NAME': 'Jinja2_plaintext',
    'DIRS': [os.path.join(DEPLOY_ROOT, 'templates')],
    'APP_DIRS': False,
})
non_html_template_engine_settings['OPTIONS'].update({
    'autoescape': False,
    'trim_blocks': True,
    'lstrip_blocks': True,
})

# django-two-factor uses the default Django template engine (not Jinja2), so we
# need to add config for it here.
two_factor_template_options = deepcopy(default_template_engine_settings['OPTIONS'])
del two_factor_template_options['environment']
del two_factor_template_options['extensions']
two_factor_template_options['loaders'] = ['zproject.settings.TwoFactorLoader']

two_factor_template_engine_settings = {
    'NAME': 'Two_Factor',
    'BACKEND': 'django.template.backends.django.DjangoTemplates',
    'DIRS': [],
    'APP_DIRS': False,
    'OPTIONS': two_factor_template_options,
}

# The order here is important; get_template and related/parent functions try
# the template engines in order until one succeeds.
TEMPLATES = [
    default_template_engine_settings,
    non_html_template_engine_settings,
    two_factor_template_engine_settings,
]
########################################################################
# LOGGING SETTINGS
########################################################################

def zulip_path(path: str) -> str:
    if DEVELOPMENT:
        # if DEVELOPMENT, store these files in the Zulip checkout
        if path.startswith("/var/log"):
            path = os.path.join(DEVELOPMENT_LOG_DIRECTORY, os.path.basename(path))
        else:
            path = os.path.join(os.path.join(DEPLOY_ROOT, 'var'), os.path.basename(path))
    return path

SERVER_LOG_PATH = zulip_path("/var/log/zulip/server.log")
ERROR_FILE_LOG_PATH = zulip_path("/var/log/zulip/errors.log")
MANAGEMENT_LOG_PATH = zulip_path("/var/log/zulip/manage.log")
WORKER_LOG_PATH = zulip_path("/var/log/zulip/workers.log")
JSON_PERSISTENT_QUEUE_FILENAME_PATTERN = zulip_path("/home/zulip/tornado/event_queues%s.json")
EMAIL_LOG_PATH = zulip_path("/var/log/zulip/send_email.log")
EMAIL_MIRROR_LOG_PATH = zulip_path("/var/log/zulip/email_mirror.log")
EMAIL_DELIVERER_LOG_PATH = zulip_path("/var/log/zulip/email-deliverer.log")
EMAIL_CONTENT_LOG_PATH = zulip_path("/var/log/zulip/email_content.log")
LDAP_LOG_PATH = zulip_path("/var/log/zulip/ldap.log")
LDAP_SYNC_LOG_PATH = zulip_path("/var/log/zulip/sync_ldap_user_data.log")
QUEUE_ERROR_DIR = zulip_path("/var/log/zulip/queue_error")
QUEUE_STATS_DIR = zulip_path("/var/log/zulip/queue_stats")
DIGEST_LOG_PATH = zulip_path("/var/log/zulip/digest.log")
ANALYTICS_LOG_PATH = zulip_path("/var/log/zulip/analytics.log")
ANALYTICS_LOCK_DIR = zulip_path("/home/zulip/deployments/analytics-lock-dir")
API_KEY_ONLY_WEBHOOK_LOG_PATH = zulip_path("/var/log/zulip/webhooks_errors.log")
WEBHOOK_UNEXPECTED_EVENTS_LOG_PATH = zulip_path("/var/log/zulip/webhooks_unexpected_events.log")
SOFT_DEACTIVATION_LOG_PATH = zulip_path("/var/log/zulip/soft_deactivation.log")
TRACEMALLOC_DUMP_DIR = zulip_path("/var/log/zulip/tracemalloc")
SCHEDULED_MESSAGE_DELIVERER_LOG_PATH = zulip_path("/var/log/zulip/scheduled_message_deliverer.log")
RETENTION_LOG_PATH = zulip_path("/var/log/zulip/message_retention.log")

# The EVENT_LOGS feature is an ultra-legacy piece of code, which
# originally logged all significant database changes for debugging.
# We plan to replace it with RealmAuditLog, stored in the database,
# everywhere that code mentioning it appears.
if EVENT_LOGS_ENABLED:
    EVENT_LOG_DIR = zulip_path("/home/zulip/logs/event_log")  # type: Optional[str]
else:
    EVENT_LOG_DIR = None

ZULIP_WORKER_TEST_FILE = '/tmp/zulip-worker-test-file'


if IS_WORKER:
    FILE_LOG_PATH = WORKER_LOG_PATH
else:
    FILE_LOG_PATH = SERVER_LOG_PATH

# This is disabled in a few tests.
LOGGING_ENABLED = True

DEFAULT_ZULIP_HANDLERS = (
    (['zulip_admins'] if ERROR_REPORTING else []) +
    ['console', 'file', 'errors_file']
)

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'default': {
            '()': 'zerver.lib.logging_util.ZulipFormatter',
        }
    },
    'filters': {
        'ZulipLimiter': {
            '()': 'zerver.lib.logging_util.ZulipLimiter',
        },
        'EmailLimiter': {
            '()': 'zerver.lib.logging_util.EmailLimiter',
        },
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse',
        },
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
        'nop': {
            '()': 'zerver.lib.logging_util.ReturnTrue',
        },
        'require_logging_enabled': {
            '()': 'zerver.lib.logging_util.ReturnEnabled',
        },
        'require_really_deployed': {
            '()': 'zerver.lib.logging_util.RequireReallyDeployed',
        },
        'skip_200_and_304': {
            '()': 'django.utils.log.CallbackFilter',
            'callback': zerver.lib.logging_util.skip_200_and_304,
        },
        'skip_site_packages_logs': {
            '()': 'django.utils.log.CallbackFilter',
            'callback': zerver.lib.logging_util.skip_site_packages_logs,
        },
    },
    'handlers': {
        'zulip_admins': {
            'level': 'ERROR',
            'class': 'zerver.logging_handlers.AdminNotifyHandler',
            'filters': (['ZulipLimiter', 'require_debug_false', 'require_really_deployed']
                        if not DEBUG_ERROR_REPORTING else []),
            'formatter': 'default'
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'default'
        },
        'file': {
            'level': 'DEBUG',
            'class': 'logging.handlers.WatchedFileHandler',
            'formatter': 'default',
            'filename': FILE_LOG_PATH,
        },
        'errors_file': {
            'level': 'WARNING',
            'class': 'logging.handlers.WatchedFileHandler',
            'formatter': 'default',
            'filename': ERROR_FILE_LOG_PATH,
        },
        'ldap_file': {
            'level': 'DEBUG',
            'class': 'logging.handlers.WatchedFileHandler',
            'formatter': 'default',
            'filename': LDAP_LOG_PATH,
        },
    },
    'loggers': {
        # The Python logging module uses a hierarchy of logger names for config:
        # "foo.bar" has parent "foo" has parent "", the root.  But the semantics
        # are subtle: it walks this hierarchy once to find the log level to
        # decide whether to log the record at all, then a separate time to find
        # handlers to emit the record.
        #
        # For `level`, the most specific ancestor that has a `level` counts.
        # For `handlers`, the most specific ancestor that has a `handlers`
        # counts (assuming we set `propagate=False`, which we always do.)
        # These are independent -- they might come at the same layer, or
        # either one could come before the other.
        #
        # For `filters`, no ancestors count at all -- only the exact logger name
        # the record was logged at.
        #
        # Upstream docs: https://docs.python.org/3/library/logging
        #
        # Style rules:
        #  * Always set `propagate=False` if setting `handlers`.
        #  * Setting `level` equal to the parent is redundant; don't.
        #  * Setting `handlers` equal to the parent is redundant; don't.
        #  * Always write in order: level, filters, handlers, propagate.

        # root logger
        '': {
            'level': 'INFO',
            'filters': ['require_logging_enabled'],
            'handlers': DEFAULT_ZULIP_HANDLERS,
        },

        # Django, alphabetized
        'django': {
            # Django's default logging config has already set some
            # things on this logger.  Just mentioning it here causes
            # `logging.config` to reset it to defaults, as if never
            # configured; which is what we want for it.
        },
        'django.request': {
            # We set this to ERROR to prevent Django's default
            # low-value logs with lines like "Not Found: /robots.txt"
            # from being logged for every HTTP 4xx error at WARNING
            # level, which would otherwise end up spamming our
            # errors.log.  We'll still get logs in errors.log
            # including tracebacks for 5xx errors (i.e. Python
            # exceptions).
            'level': 'ERROR',
        },
        'django.security.DisallowedHost': {
            'handlers': ['file'],
            'propagate': False,
        },
        'django.server': {
            'filters': ['skip_200_and_304'],
            'handlers': ['console', 'file'],
            'propagate': False,
        },
        'django.template': {
            'level': 'DEBUG',
            'filters': ['require_debug_true', 'skip_site_packages_logs'],
            'handlers': ['console'],
            'propagate': False,
        },

        ## Uncomment the following to get all database queries logged to the console
        # 'django.db': {
        #     'level': 'DEBUG',
        #     'handlers': ['console'],
        #     'propagate': False,
        # },

        # other libraries, alphabetized
        'django_auth_ldap': {
            'level': 'DEBUG',
            'handlers': ['console', 'ldap_file', 'errors_file'],
            'propagate': False,
        },
        'pika.adapters': {
            # pika is super chatty on INFO.
            'level': 'WARNING',
            # pika spews a lot of ERROR logs when a connection fails.
            # We reconnect automatically, so those should be treated as WARNING --
            # write to the log for use in debugging, but no error emails/Zulips.
            'handlers': ['console', 'file', 'errors_file'],
            'propagate': False,
        },
        'pika.connection': {
            # Leave `zulip_admins` out of the handlers.  See pika.adapters above.
            'handlers': ['console', 'file', 'errors_file'],
            'propagate': False,
        },
        'requests': {
            'level': 'WARNING',
        },

        # our own loggers, alphabetized
        'zerver.lib.digest': {
            'level': 'DEBUG',
        },
        'zerver.management.commands.deliver_email': {
            'level': 'DEBUG',
        },
        'zerver.management.commands.enqueue_digest_emails': {
            'level': 'DEBUG',
        },
        'zerver.management.commands.deliver_scheduled_messages': {
            'level': 'DEBUG',
        },
        'zulip.ldap': {
            'level': 'DEBUG',
            'handlers': ['console', 'ldap_file', 'errors_file'],
            'propagate': False,
        },
        'zulip.management': {
            'handlers': ['file', 'errors_file'],
            'propagate': False,
        },
        'zulip.queue': {
            'level': 'WARNING',
        },
        'zulip.retention': {
            'handlers': ['file', 'errors_file'],
            'propagate': False,
        },
        'zulip.soft_deactivation': {
            'handlers': ['file', 'errors_file'],
            'propagate': False,
        },
        'zulip.zerver.lib.webhooks.common': {
            'level': 'DEBUG',
            'handlers': ['file', 'errors_file'],
            'propagate': False,
        },
        'zulip.zerver.webhooks': {
            'level': 'DEBUG',
            'handlers': ['file', 'errors_file'],
            'propagate': False,
        },
    }
}  # type: Dict[str, Any]

if DEVELOPMENT:
    CONTRIBUTOR_DATA_FILE_PATH = os.path.join(DEPLOY_ROOT, 'var/github-contributors.json')
else:
    CONTRIBUTOR_DATA_FILE_PATH = '/var/lib/zulip/github-contributors.json'

LOGIN_REDIRECT_URL = '/'

# Client-side polling timeout for get_events, in milliseconds.
# We configure this here so that the client test suite can override it.
# We already kill the connection server-side with heartbeat events,
# but it's good to have a safety.  This value should be greater than
# (HEARTBEAT_MIN_FREQ_SECS + 10)
POLL_TIMEOUT = 90 * 1000

########################################################################
# SSO AND LDAP SETTINGS
########################################################################

USING_APACHE_SSO = ('zproject.backends.ZulipRemoteUserBackend' in AUTHENTICATION_BACKENDS)

if 'LDAP_DEACTIVATE_NON_MATCHING_USERS' not in vars():
    LDAP_DEACTIVATE_NON_MATCHING_USERS = (
        len(AUTHENTICATION_BACKENDS) == 1 and (AUTHENTICATION_BACKENDS[0] ==
                                               "zproject.backends.ZulipLDAPAuthBackend"))

if len(AUTHENTICATION_BACKENDS) == 1 and (AUTHENTICATION_BACKENDS[0] ==
                                          "zproject.backends.ZulipRemoteUserBackend"):
    HOME_NOT_LOGGED_IN = "/accounts/login/sso/"
    ONLY_SSO = True
else:
    HOME_NOT_LOGGED_IN = '/login/'
    ONLY_SSO = False
AUTHENTICATION_BACKENDS += ('zproject.backends.ZulipDummyBackend',)

# Redirect to /devlogin/ by default in dev mode
if DEVELOPMENT:
    HOME_NOT_LOGGED_IN = '/devlogin/'
    LOGIN_URL = '/devlogin/'

POPULATE_PROFILE_VIA_LDAP = bool(AUTH_LDAP_SERVER_URI)

if POPULATE_PROFILE_VIA_LDAP and \
   'zproject.backends.ZulipLDAPAuthBackend' not in AUTHENTICATION_BACKENDS:
    AUTHENTICATION_BACKENDS += ('zproject.backends.ZulipLDAPUserPopulator',)
else:
    POPULATE_PROFILE_VIA_LDAP = (
        'zproject.backends.ZulipLDAPAuthBackend' in AUTHENTICATION_BACKENDS or
        POPULATE_PROFILE_VIA_LDAP)

if POPULATE_PROFILE_VIA_LDAP:
    import ldap
    if (AUTH_LDAP_BIND_DN and ldap.OPT_REFERRALS not in AUTH_LDAP_CONNECTION_OPTIONS):
        # The default behavior of python-ldap (without setting option
        # `ldap.OPT_REFERRALS`) is to follow referrals, but anonymously.
        # If our original query was non-anonymous, that's unlikely to
        # work; skip the referral.
        #
        # The common case of this is that the server is Active Directory,
        # it's already given us the answer we need, and the referral is
        # just speculation about someplace else that has data our query
        # could in principle match.
        AUTH_LDAP_CONNECTION_OPTIONS[ldap.OPT_REFERRALS] = 0

if REGISTER_LINK_DISABLED is None:
    # The default for REGISTER_LINK_DISABLED is a bit more
    # complicated: we want it to be disabled by default for people
    # using the LDAP backend that auto-creates users on login.
    if (len(AUTHENTICATION_BACKENDS) == 2 and
            ('zproject.backends.ZulipLDAPAuthBackend' in AUTHENTICATION_BACKENDS)):
        REGISTER_LINK_DISABLED = True
    else:
        REGISTER_LINK_DISABLED = False

########################################################################
# SOCIAL AUTHENTICATION SETTINGS
########################################################################

SOCIAL_AUTH_FIELDS_STORED_IN_SESSION = ['subdomain', 'is_signup', 'mobile_flow_otp', 'desktop_flow_otp',
                                        'multiuse_object_key']
SOCIAL_AUTH_LOGIN_ERROR_URL = '/login/'

SOCIAL_AUTH_GITHUB_SECRET = get_secret('social_auth_github_secret')
SOCIAL_AUTH_GITLAB_SECRET = get_secret('social_auth_gitlab_secret')
SOCIAL_AUTH_GITHUB_SCOPE = ['user:email']
if SOCIAL_AUTH_GITHUB_ORG_NAME or SOCIAL_AUTH_GITHUB_TEAM_ID:
    SOCIAL_AUTH_GITHUB_SCOPE.append("read:org")
SOCIAL_AUTH_GITHUB_ORG_KEY = SOCIAL_AUTH_GITHUB_KEY
SOCIAL_AUTH_GITHUB_ORG_SECRET = SOCIAL_AUTH_GITHUB_SECRET
SOCIAL_AUTH_GITHUB_TEAM_KEY = SOCIAL_AUTH_GITHUB_KEY
SOCIAL_AUTH_GITHUB_TEAM_SECRET = SOCIAL_AUTH_GITHUB_SECRET

SOCIAL_AUTH_GOOGLE_SECRET = get_secret('social_auth_google_secret')
# Fallback to google-oauth settings in case social auth settings for
# google are missing; this is for backwards-compatibility with older
# Zulip versions where /etc/zulip/settings.py has not been migrated yet.
GOOGLE_OAUTH2_CLIENT_SECRET = get_secret('google_oauth2_client_secret')
SOCIAL_AUTH_GOOGLE_KEY = SOCIAL_AUTH_GOOGLE_KEY or GOOGLE_OAUTH2_CLIENT_ID
SOCIAL_AUTH_GOOGLE_SECRET = SOCIAL_AUTH_GOOGLE_SECRET or GOOGLE_OAUTH2_CLIENT_SECRET

if PRODUCTION:
    SOCIAL_AUTH_SAML_SP_PUBLIC_CERT = get_from_file_if_exists("/etc/zulip/saml/zulip-cert.crt")
    SOCIAL_AUTH_SAML_SP_PRIVATE_KEY = get_from_file_if_exists("/etc/zulip/saml/zulip-private-key.key")

if "signatureAlgorithm" not in SOCIAL_AUTH_SAML_SECURITY_CONFIG:
    # If the configuration doesn't explicitly specify the algorithm,
    # we set RSA1 with SHA256 to override the python3-saml default, which uses
    # insecure SHA1.
    default_signature_alg = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"
    SOCIAL_AUTH_SAML_SECURITY_CONFIG["signatureAlgorithm"] = default_signature_alg

for idp_name, idp_dict in SOCIAL_AUTH_SAML_ENABLED_IDPS.items():
    if DEVELOPMENT:
        idp_dict['entity_id'] = get_secret('saml_entity_id', '')
        idp_dict['url'] = get_secret('saml_url', '')
        idp_dict['x509cert_path'] = 'zproject/dev_saml.cert'

    # Set `x509cert` if not specified already; also support an override path.
    if 'x509cert' in idp_dict:
        continue

    if 'x509cert_path' in idp_dict:
        path = idp_dict['x509cert_path']
    else:
        path = "/etc/zulip/saml/idps/{}.crt".format(idp_name)
    idp_dict['x509cert'] = get_from_file_if_exists(path)

SOCIAL_AUTH_PIPELINE = [
    'social_core.pipeline.social_auth.social_details',
    'zproject.backends.social_auth_associate_user',
    'zproject.backends.social_auth_finish',
]

########################################################################
# EMAIL SETTINGS
########################################################################

# Django setting. Not used in the Zulip codebase.
DEFAULT_FROM_EMAIL = ZULIP_ADMINISTRATOR

if EMAIL_BACKEND is not None:
    # If the server admin specified a custom email backend, use that.
    pass
elif DEVELOPMENT:
    # In the dev environment, emails are printed to the run-dev.py console.
    EMAIL_BACKEND = 'zproject.email_backends.EmailLogBackEnd'
elif not EMAIL_HOST:
    # If an email host is not specified, fail gracefully
    WARN_NO_EMAIL = True
    EMAIL_BACKEND = 'django.core.mail.backends.dummy.EmailBackend'
else:
    EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'

EMAIL_HOST_PASSWORD = get_secret('email_password')
EMAIL_GATEWAY_PASSWORD = get_secret('email_gateway_password')
AUTH_LDAP_BIND_PASSWORD = get_secret('auth_ldap_bind_password', '')

########################################################################
# MISC SETTINGS
########################################################################

if PRODUCTION:
    # Filter out user data
    DEFAULT_EXCEPTION_REPORTER_FILTER = 'zerver.filters.ZulipExceptionReporterFilter'

# This is a debugging option only
PROFILE_ALL_REQUESTS = False

CROSS_REALM_BOT_EMAILS = {
    'notification-bot@zulip.com',
    'welcome-bot@zulip.com',
    'emailgateway@zulip.com',
}

THUMBOR_KEY = get_secret('thumbor_key')

TWO_FACTOR_PATCH_ADMIN = False