Added new auth-related methods and events to mcp server (#2496)

This PR adds the following:
* A getAuthStatus method on the mcp server. This returns the auth method
currently in use (chatgpt or apikey) or none if the user is not
authenticated. It also returns the "preferred auth method" which
reflects the `preferred_auth_method` value in the config.
* A logout method on the mcp server. If called, it logs out the user and
deletes the `auth.json` file — the same behavior in the cli's `/logout`
command.
* An `authStatusChange` event notification that is sent when the auth
status changes due to successful login or logout operations.
* Logic to pass command-line config overrides to the mcp server at
startup time. This allows use cases like `codex mcp -c
preferred_auth_method=apikey`.

codex-rs/mcp-server/src/lib.rs

@@ -1,9 +1,14 @@
 //! Prototype MCP server.
 #![deny(clippy::print_stdout, clippy::print_stderr)]
 
+use std::io::ErrorKind;
 use std::io::Result as IoResult;
 use std::path::PathBuf;
 
+use codex_common::CliConfigOverrides;
+use codex_core::config::Config;
+use codex_core::config::ConfigOverrides;
+
 use mcp_types::JSONRPCMessage;
 use tokio::io::AsyncBufReadExt;
 use tokio::io::AsyncWriteExt;
@@ -41,7 +46,10 @@ pub use crate::patch_approval::PatchApprovalResponse;
 /// plenty for an interactive CLI.
 const CHANNEL_CAPACITY: usize = 128;
 
-pub async fn run_main(codex_linux_sandbox_exe: Option<PathBuf>) -> IoResult<()> {
+pub async fn run_main(
+    codex_linux_sandbox_exe: Option<PathBuf>,
+    cli_config_overrides: CliConfigOverrides,
+) -> IoResult<()> {
     // Install a simple subscriber so `tracing` output is visible.  Users can
     // control the log level with `RUST_LOG`.
     tracing_subscriber::fmt()
@@ -77,10 +85,27 @@ pub async fn run_main(codex_linux_sandbox_exe: Option<PathBuf>) -> IoResult<()>
         }
     });
 
+    // Parse CLI overrides once and derive the base Config eagerly so later
+    // components do not need to work with raw TOML values.
+    let cli_kv_overrides = cli_config_overrides.parse_overrides().map_err(|e| {
+        std::io::Error::new(
+            ErrorKind::InvalidInput,
+            format!("error parsing -c overrides: {e}"),
+        )
+    })?;
+    let config = Config::load_with_cli_overrides(cli_kv_overrides, ConfigOverrides::default())
+        .map_err(|e| {
+            std::io::Error::new(ErrorKind::InvalidData, format!("error loading config: {e}"))
+        })?;
+
     // Task: process incoming messages.
     let processor_handle = tokio::spawn({
         let outgoing_message_sender = OutgoingMessageSender::new(outgoing_tx);
-        let mut processor = MessageProcessor::new(outgoing_message_sender, codex_linux_sandbox_exe);
+        let mut processor = MessageProcessor::new(
+            outgoing_message_sender,
+            codex_linux_sandbox_exe,
+            std::sync::Arc::new(config),
+        );
         async move {
             while let Some(msg) = incoming_rx.recv().await {
                 match msg {