Fix default CORS settings. (#7387)

* Fix default CORS settings.

* Add info regarding special options.

parity/cli/mod.rs

@@ -466,9 +466,9 @@ usage! {
 			"--jsonrpc-threads=[THREADS]",
 			"Turn on additional processing threads in all RPC servers. Setting this to non-zero value allows parallel cpu-heavy queries execution.",
 
-			ARG arg_jsonrpc_cors: (Option<String>) = None, or |c: &Config| otry!(c.rpc).cors.clone(),
+			ARG arg_jsonrpc_cors: (String) = "none", or |c: &Config| otry!(c.rpc).cors.as_ref().map(|vec| vec.join(",")),
 			"--jsonrpc-cors=[URL]",
-			"Specify CORS header for JSON-RPC API responses.",
+			"Specify CORS header for JSON-RPC API responses. Special options: \"all\", \"none\".",
 
 			ARG arg_jsonrpc_server_threads: (Option<usize>) = None, or |c: &Config| otry!(c.rpc).server_threads,
 			"--jsonrpc-server-threads=[NUM]",
@@ -538,9 +538,9 @@ usage! {
 			"--ipfs-api-hosts=[HOSTS]",
 			"List of allowed Host header values. This option will validate the Host header sent by the browser, it is additional security against some attack vectors. Special options: \"all\", \"none\".",
 
-			ARG arg_ipfs_api_cors: (Option<String>) = None, or |c: &Config| otry!(c.ipfs).cors.clone(),
+			ARG arg_ipfs_api_cors: (String) = "none", or |c: &Config| otry!(c.ipfs).cors.as_ref().map(|vec| vec.join(",")),
 			"--ipfs-api-cors=[URL]",
-			"Specify CORS header for IPFS API responses.",
+			"Specify CORS header for IPFS API responses. Special options: \"all\", \"none\".",
 
 		["Secret store options"]
 			FLAG flag_no_secretstore: (bool) = false, or |c: &Config| otry!(c.secretstore).disable.clone(),
@@ -1052,7 +1052,7 @@ struct Rpc {
 	disable: Option<bool>,
 	port: Option<u16>,
 	interface: Option<String>,
-	cors: Option<String>,
+	cors: Option<Vec<String>>,
 	apis: Option<Vec<String>>,
 	hosts: Option<Vec<String>>,
 	server_threads: Option<usize>,
@@ -1108,7 +1108,7 @@ struct Ipfs {
 	enable: Option<bool>,
 	port: Option<u16>,
 	interface: Option<String>,
-	cors: Option<String>,
+	cors: Option<Vec<String>>,
 	hosts: Option<Vec<String>>,
 }
 
@@ -1468,7 +1468,7 @@ mod tests {
 			flag_no_jsonrpc: false,
 			arg_jsonrpc_port: 8545u16,
 			arg_jsonrpc_interface: "local".into(),
-			arg_jsonrpc_cors: Some("null".into()),
+			arg_jsonrpc_cors: "null".into(),
 			arg_jsonrpc_apis: "web3,eth,net,parity,traces,rpc,secretstore".into(),
 			arg_jsonrpc_hosts: "none".into(),
 			arg_jsonrpc_server_threads: None,
@@ -1507,7 +1507,7 @@ mod tests {
 			flag_ipfs_api: false,
 			arg_ipfs_api_port: 5001u16,
 			arg_ipfs_api_interface: "local".into(),
-			arg_ipfs_api_cors: Some("null".into()),
+			arg_ipfs_api_cors: "null".into(),
 			arg_ipfs_api_hosts: "none".into(),
 
 			// -- Sealing/Mining Options

parity/cli/tests/config.full.toml

@@ -49,7 +49,7 @@ reserved_peers = "./path_to_file"
 disable = false
 port = 8545
 interface = "local"
-cors = "null"
+cors = ["null"]
 apis = ["web3", "eth", "net", "parity", "traces", "rpc", "secretstore"]
 hosts = ["none"]
 
@@ -91,7 +91,7 @@ path = "$HOME/.parity/secretstore"
 enable = false
 port = 5001
 interface = "local"
-cors = "null"
+cors = ["null"]
 hosts = ["none"]
 
 [mining]

parity/configuration.rs

@@ -775,13 +775,19 @@ impl Configuration {
 		apis.join(",")
 	}
 
-	fn cors(cors: Option<&String>) -> Option<Vec<String>> {
-		cors.map(|ref c| c.split(',').map(Into::into).collect())
+	fn cors(cors: &str) -> Option<Vec<String>> {
+		match cors {
+			"none" => return Some(Vec::new()),
+			"*" | "all" | "any" => return None,
+			_ => {},
+		}
+
+		Some(cors.split(',').map(Into::into).collect())
 	}
 
 	fn rpc_cors(&self) -> Option<Vec<String>> {
-		let cors = self.args.arg_jsonrpc_cors.as_ref().or(self.args.arg_rpccorsdomain.as_ref());
-		Self::cors(cors)
+		let cors = self.args.arg_rpccorsdomain.clone().unwrap_or_else(|| self.args.arg_jsonrpc_cors.to_owned());
+		Self::cors(&cors)
 	}
 
 	fn ipfs_cors(&self) -> Option<Vec<String>> {
@@ -1458,7 +1464,7 @@ mod tests {
 			assert_eq!(net.rpc_enabled, true);
 			assert_eq!(net.rpc_interface, "0.0.0.0".to_owned());
 			assert_eq!(net.rpc_port, 8000);
-			assert_eq!(conf.rpc_cors(), Some(vec!["*".to_owned()]));
+			assert_eq!(conf.rpc_cors(), None);
 			assert_eq!(conf.rpc_apis(), "web3,eth".to_owned());
 		}
 
@@ -1525,8 +1531,8 @@ mod tests {
 		let conf2 = parse(&["parity", "--ipfs-api-cors", "http://parity.io,http://something.io"]);
 
 		// then
-		assert_eq!(conf0.ipfs_cors(), None);
-		assert_eq!(conf1.ipfs_cors(), Some(vec!["*".into()]));
+		assert_eq!(conf0.ipfs_cors(), Some(vec![]));
+		assert_eq!(conf1.ipfs_cors(), None);
 		assert_eq!(conf2.ipfs_cors(), Some(vec!["http://parity.io".into(),"http://something.io".into()]));
 	}
 

parity/ipfs.rs

@@ -34,8 +34,8 @@ impl Default for Configuration {
 			enabled: false,
 			port: 5001,
 			interface: "127.0.0.1".into(),
-			cors: None,
-			hosts: Some(Vec::new()),
+			cors: Some(vec![]),
+			hosts: Some(vec![]),
 		}
 	}
 }

parity/rpc.rs

@@ -59,8 +59,8 @@ impl Default for HttpConfiguration {
 			interface: "127.0.0.1".into(),
 			port: 8545,
 			apis: ApiSet::UnsafeContext,
-			cors: None,
-			hosts: Some(Vec::new()),
+			cors: Some(vec![]),
+			hosts: Some(vec![]),
 			server_threads: 1,
 			processing_threads: 4,
 		}
@@ -98,7 +98,7 @@ impl From<UiConfiguration> for HttpConfiguration {
 			interface: conf.interface,
 			port: conf.port,
 			apis: rpc_apis::ApiSet::UnsafeContext,
-			cors: None,
+			cors: Some(vec![]),
 			hosts: conf.hosts,
 			server_threads: 1,
 			processing_threads: 0,