feat: OpenAICompatibleOAuthProvider (config-driven OAuthProvider impl)

src/client/claude_oauth.rs

@@ -25,8 +25,8 @@ impl OAuthProvider for ClaudeOAuthProvider {
         "https://console.anthropic.com/oauth/code/callback"
     }
 
-    fn scopes(&self) -> &str {
-        "org:create_api_key user:profile user:inference"
+    fn scopes(&self) -> String {
+        "org:create_api_key user:profile user:inference".to_string()
     }
 
     fn extra_authorize_params(&self) -> Vec<(&str, &str)> {

src/client/gemini_oauth.rs

@@ -27,8 +27,8 @@ impl OAuthProvider for GeminiOAuthProvider {
         ""
     }
 
-    fn scopes(&self) -> &str {
-        "https://www.googleapis.com/auth/generative-language.peruserquota https://www.googleapis.com/auth/generative-language.retriever https://www.googleapis.com/auth/userinfo.email"
+    fn scopes(&self) -> String {
+        "https://www.googleapis.com/auth/generative-language.peruserquota https://www.googleapis.com/auth/generative-language.retriever https://www.googleapis.com/auth/userinfo.email".to_string()
     }
 
     fn client_secret(&self) -> Option<&str> {

src/client/mod.rs

@@ -4,6 +4,7 @@ mod common;
 mod gemini_oauth;
 mod message;
 pub mod oauth;
+mod openai_compatible_oauth;
 mod openai_oauth;
 #[macro_use]
 mod macros;

src/client/oauth.rs

@@ -118,7 +118,7 @@ pub trait OAuthProvider: Send + Sync {
     fn authorize_url(&self) -> &str;
     fn token_url(&self) -> &str;
     fn redirect_uri(&self) -> &str;
-    fn scopes(&self) -> &str;
+    fn scopes(&self) -> String;
 
     fn client_secret(&self) -> Option<&str> {
         None
@@ -204,7 +204,8 @@ async fn run_pkce_flow(provider: &dyn OAuthProvider, client_name: &str) -> Resul
         (provider.redirect_uri().to_string(), false)
     };
 
-    let encoded_scopes = urlencoding::encode(provider.scopes());
+    let scopes = provider.scopes();
+    let encoded_scopes = urlencoding::encode(&scopes);
     let encoded_redirect = urlencoding::encode(&redirect_uri);
 
     let mut authorize_url = format!(
@@ -313,7 +314,7 @@ async fn run_client_credentials_flow(
         ("client_id", provider.client_id()),
     ];
     if !scopes.is_empty() {
-        params.push(("scope", scopes));
+        params.push(("scope", scopes.as_str()));
     }
 
     let request = build_token_request(&client, provider, &params);

src/client/openai_compatible_oauth.rs

@@ -0,0 +1,92 @@
+use super::oauth::{OAuthConfig, OAuthFlow, OAuthProvider, TokenRequestFormat};
+
+pub struct OpenAICompatibleOAuthProvider {
+    pub config: OAuthConfig,
+    pub client_name: String,
+}
+
+impl OAuthProvider for OpenAICompatibleOAuthProvider {
+    fn provider_name(&self) -> &str {
+        &self.client_name
+    }
+
+    fn client_id(&self) -> &str {
+        &self.config.client_id
+    }
+
+    fn authorize_url(&self) -> &str {
+        self.config.authorize_url.as_deref().unwrap_or("")
+    }
+
+    fn token_url(&self) -> &str {
+        &self.config.token_url
+    }
+
+    fn redirect_uri(&self) -> &str {
+        self.config.redirect_uri.as_deref().unwrap_or("")
+    }
+
+    fn scopes(&self) -> String {
+        self.config.scopes.join(" ")
+    }
+
+    fn client_secret(&self) -> Option<&str> {
+        self.config.client_secret.as_deref()
+    }
+
+    fn extra_authorize_params(&self) -> Vec<(&str, &str)> {
+        self.config
+            .extra_authorize_params
+            .iter()
+            .map(|(k, v)| (k.as_str(), v.as_str()))
+            .collect()
+    }
+
+    fn token_request_format(&self) -> TokenRequestFormat {
+        self.config
+            .token_request_format
+            .unwrap_or(TokenRequestFormat::FormUrlEncoded)
+    }
+
+    fn uses_localhost_redirect(&self) -> bool {
+        self.config.redirect_uri.is_none() && self.config.redirect_port.is_none()
+    }
+
+    fn fixed_redirect_uri(&self) -> Option<String> {
+        if let Some(uri) = &self.config.redirect_uri {
+            return Some(uri.clone());
+        }
+        if let Some(port) = self.config.redirect_port {
+            return Some(format!("http://127.0.0.1:{port}/callback"));
+        }
+        None
+    }
+
+    fn extra_token_headers(&self) -> Vec<(&str, &str)> {
+        self.config
+            .extra_token_headers
+            .iter()
+            .map(|(k, v)| (k.as_str(), v.as_str()))
+            .collect()
+    }
+
+    fn extra_request_headers(&self) -> Vec<(&str, &str)> {
+        self.config
+            .extra_request_headers
+            .iter()
+            .map(|(k, v)| (k.as_str(), v.as_str()))
+            .collect()
+    }
+
+    fn flow(&self) -> OAuthFlow {
+        self.config.flow
+    }
+
+    fn echo_pkce_in_token_exchange(&self) -> bool {
+        self.config.echo_pkce_in_token_exchange
+    }
+
+    fn include_state_in_token_exchange(&self) -> bool {
+        self.config.include_state_in_token_exchange
+    }
+}

src/client/openai_oauth.rs

@@ -26,8 +26,8 @@ impl OAuthProvider for OpenAIOAuthProvider {
         "http://localhost:1455/auth/callback"
     }
 
-    fn scopes(&self) -> &str {
-        "openid profile email offline_access"
+    fn scopes(&self) -> String {
+        "openid profile email offline_access".to_string()
     }
 
     fn token_request_format(&self) -> TokenRequestFormat {