refactor(auth): setup convenience for OAuth

Signed-off-by: kjuulh <contact@kjuulh.io>

como_auth/src/lib.rs

@@ -1,4 +1,5 @@
 pub use introspection::IntrospectionConfigClap;
+use oauth::{OAuth, ZitadelConfig};
 
 mod introspection;
 mod oauth;
@@ -47,7 +48,16 @@ pub struct ZitadelClap {
     pub token_url: Option<String>,
 }
 
-impl AuthClap {}
+impl TryFrom<AuthClap> for OAuth {
+    type Error = anyhow::Error;
+
+    fn try_from(value: AuthClap) -> Result<Self, Self::Error> {
+        match value.engine {
+            AuthEngine::Noop => Ok(OAuth::new_noop()),
+            AuthEngine::Zitadel => Ok(OAuth::from(ZitadelConfig::try_from(value.zitadel)?)),
+        }
+    }
+}
 
 #[cfg(test)]
 mod test {

como_auth/src/oauth.rs

@@ -3,6 +3,8 @@ use oauth2::{basic::BasicClient, AuthUrl, ClientId, ClientSecret, RedirectUrl, T
 use std::ops::Deref;
 use std::sync::Arc;
 
+use crate::ZitadelClap;
+
 #[async_trait]
 pub trait OAuthClient {
     async fn get_token(&self) -> anyhow::Result<()>;
@@ -104,6 +106,33 @@ impl From<ZitadelConfig> for ZitadelOAuthClient {
     }
 }
 
+impl TryFrom<ZitadelClap> for ZitadelConfig {
+    type Error = anyhow::Error;
+
+    fn try_from(value: ZitadelClap) -> Result<Self, Self::Error> {
+        Ok(Self {
+            auth_url: value
+                .auth_url
+                .ok_or(anyhow::anyhow!("auth_url was not set"))?,
+            client_id: value
+                .client_id
+                .ok_or(anyhow::anyhow!("client_id was not set"))?,
+            client_secret: value
+                .client_secret
+                .ok_or(anyhow::anyhow!("client_secret was not set"))?,
+            redirect_url: value
+                .redirect_url
+                .ok_or(anyhow::anyhow!("redirect_url was not set"))?,
+            token_url: value
+                .token_url
+                .ok_or(anyhow::anyhow!("token_url was not set"))?,
+            authority_url: value
+                .authority_url
+                .ok_or(anyhow::anyhow!("authority_url was not set"))?,
+        })
+    }
+}
+
 #[async_trait]
 impl OAuthClient for ZitadelOAuthClient {
     async fn get_token(&self) -> anyhow::Result<()> {
@@ -113,10 +142,7 @@ impl OAuthClient for ZitadelOAuthClient {
 
 #[cfg(test)]
 mod tests {
-    use crate::{
-        oauth::{OAuth, ZitadelConfig},
-        ZitadelClap,
-    };
+    use crate::ZitadelClap;
     use clap::Parser;
     use sealed_test::prelude::*;