From 406c2eca191aed531dac74eaffafa70e956914b6 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <jesse@jesterpm.net>
Date: Sun, 28 Jan 2024 11:21:51 -0800
Subject: Accept all OAuth2 client configuration through environment variables

---
 src/main.rs | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index ec91ec1..f979e2e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,15 +34,22 @@ struct Args {
     /// variable.
     #[arg(long = "secret")]
     client_secret: Option<String>,
+
     /// Scopes that must be present for the request to succeed.
     #[arg(long = "scope")]
     scope: Vec<String>,
 
     /// The URL of the Authorization endpoint.
-    auth_url: Url,
+    /// This may also be provided through the OAUTH2_AUTHORIZATION_URL
+    /// environment variable.
+    #[arg(long = "authorization-url")]
+    auth_url: Option<Url>,
 
     /// The URL of the token introspection endpoint.
-    introspection_url: Url,
+    /// This may also be provided through the OAUTH2_INTROSPECTION_URL
+    /// environment variable.
+    #[arg(long = "introspection-url")]
+    introspection_url: Option<Url>,
 
     /// The command to run if authorized.
     command: String,
@@ -81,13 +88,33 @@ fn handle_request() -> Result<Response<Option<String>>, Error> {
         .or_else(|| env::var("OAUTH2_CLIENT_SECRET").ok())
         .map(ClientSecret::new);
 
+    let auth_url = args
+        .auth_url
+        .or_else(|| {
+            env::var("OAUTH2_AUTHORIZATION_URL")
+                .ok()
+                .and_then(|url| url.parse().ok())
+        })
+        .map(AuthUrl::from_url)
+        .expect("Missing required argument --authorization-url");
+
+    let introspection_url = args
+        .introspection_url
+        .or_else(|| {
+            env::var("OAUTH2_INTROSPECTION_URL")
+                .ok()
+                .and_then(|url| url.parse().ok())
+        })
+        .map(IntrospectionUrl::from_url)
+        .expect("Missing required argument --introspection-url");
+
     let client = Client::new(
         client_id,
         client_secret,
-        AuthUrl::from_url(args.auth_url),
+        auth_url,
         None,
     )
-    .set_introspection_uri(IntrospectionUrl::from_url(args.introspection_url));
+    .set_introspection_uri(introspection_url);
 
     let access_token = env::var("HTTP_AUTHORIZATION")
         .ok()
-- 
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