Add SPOOLMAN_CORS_ORIGIN variable

.env.example

@@ -72,3 +72,11 @@ SPOOLMAN_PORT=7912
 # Default if not set: 1000
 #PUID=1000
 #PGID=1000
+
+# Allows CORS ORIGIN. 
+# Use the https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Origin semantics
+# separated by commas
+# for example to allow request from source1.domain.com on port p1 and source2.domain.com on port p2
+# SPOOLMAN_CORS_ORIGIN=source1.domain.com:p1, source2.domain.com:p2
+# to allow from any
+# SPOOLMAN_CORS_ORIGIN=*

spoolman/env.py

@@ -210,6 +210,35 @@ def is_debug_mode() -> bool:
         return True
     raise ValueError(f"Failed to parse SPOOLMAN_DEBUG_MODE variable: Unknown debug mode '{debug_mode}'.")
 
+def is_cors_defined() -> bool:
+    """Get whether CORS is enabled from environment variables.
+
+    Returns False if no environment variable was set for CORS.
+    Returns True otherwise
+
+    Returns:
+        bool: Whether CORS is enabled.
+
+    """
+    cors = os.getenv("SPOOLMAN_CORS_ORIGIN", "FALSE").upper()
+    if cors in {"FALSE", "0"}:
+        return False
+    else:
+        return True
+
+def get_cors_origin() -> Optional[list[str]]:
+    """Get the CORS origin from environment variables.
+
+    Returns None if no environment variable was set for the origin.
+
+    Returns:
+        Optional[str]: The origin.
+
+    """
+    cors = os.getenv("SPOOLMAN_CORS_ORIGIN")
+    if cors is None:
+        return None
+    return cors.split(",")
 
 def is_automatic_backup_enabled() -> bool:
     """Get whether automatic backup is enabled from environment variables.

spoolman/main.py

@@ -104,12 +104,16 @@ def get_configjs() -> Response:
 app.mount(base_path, app=SinglePageApplication(directory="client/dist", base_path=env.get_base_path()))
 
 # Allow all origins if in debug mode
-if env.is_debug_mode():
-    logger.warning("Running in debug mode, allowing all origins.")
+if env.is_debug_mode() or env.is_cors_defined():
+    if(env.is_cors_defined()):
+        origins = env.get_cors_origin()
+    else:
+        origins = ["*"]
+        logger.warning("Running in debug mode, allowing all origins.")
 
     app.add_middleware(
         CORSMiddleware,
-        allow_origins=["*"],
+        allow_origins=origins,
         allow_credentials=True,
         allow_methods=["*"],
         allow_headers=["*"],