settings: Allow customization of STATIC_URL.

Some requests will still be to `/static/`, either at the realm's
domain, or at the root domain.

zerver/lib/subdomains.py

@@ -56,6 +56,7 @@ def is_root_domain_available() -> bool:
 
 
 def is_static_or_current_realm_url(url: str, realm: Optional[Realm]) -> bool:
+    assert settings.STATIC_URL is not None
     split_url = urllib.parse.urlsplit(url)
     split_static_url = urllib.parse.urlsplit(settings.STATIC_URL)
 

zproject/computed_settings.py

@@ -60,6 +60,7 @@ from .configured_settings import (
     SOCIAL_AUTH_SAML_ENABLED_IDPS,
     SOCIAL_AUTH_SAML_SECURITY_CONFIG,
     SOCIAL_AUTH_SUBDOMAIN,
+    STATIC_URL,
     STATSD_HOST,
     TORNADO_PORTS,
     USING_PGROONGA,
@@ -537,9 +538,10 @@ CAMO_KEY = get_secret("camo_key") if CAMO_URI != "" else None
 # STATIC CONTENT AND MINIFICATION SETTINGS
 ########################################################################
 
-if PRODUCTION or IS_DEV_DROPLET or os.getenv("EXTERNAL_HOST") is not None:
+if STATIC_URL is None:
+    if PRODUCTION or IS_DEV_DROPLET or os.getenv("EXTERNAL_HOST") is not None:
         STATIC_URL = urljoin(ROOT_DOMAIN_URI, "/static/")
-else:
+    else:
         STATIC_URL = "http://localhost:9991/static/"
 
 LOCAL_AVATARS_DIR = os.path.join(LOCAL_UPLOADS_DIR, "avatars") if LOCAL_UPLOADS_DIR else None

zproject/default_settings.py

@@ -19,6 +19,8 @@ DEBUG = DEVELOPMENT
 
 EXTERNAL_HOST_WITHOUT_PORT = deport(EXTERNAL_HOST)
 
+STATIC_URL: Optional[str] = None
+
 # These settings are intended for the server admin to set.  We document them in
 # prod_settings_template.py, and in the initial /etc/zulip/settings.py on a new
 # install of the Zulip server.

zproject/dev_urls.py

@@ -116,6 +116,7 @@ else:
         response["Access-Control-Allow-Origin"] = "*"
         return response
 
+    assert settings.STATIC_URL is not None
     urls += static(urlsplit(settings.STATIC_URL).path, view=serve_static)
 
 i18n_urls = [