feat(oauth): add additional fallback oauth backend

Author: sigaloid

Cargo.lock

@@ -59,6 +59,7 @@ htmlescape = "0.3.1"
 bincode = "1.3.3"
 base2048 = "2.0.2"
 revision = "0.10.0"
+fake_user_agent = "0.2.2"
 
 
 [dev-dependencies]

Cargo.toml

@@ -17,7 +17,7 @@ use std::sync::LazyLock;
 use std::{io, result::Result};
 
 use crate::dbg_msg;
-use crate::oauth::{force_refresh_token, token_daemon, Oauth};
+use crate::oauth::{force_refresh_token, token_daemon, Oauth, OauthBackendImpl};
 use crate::server::RequestExt;
 use crate::utils::{format_url, Post};
 
@@ -494,11 +494,17 @@ async fn self_check(sub: &str) -> Result<(), String> {
 }
 
 pub async fn rate_limit_check() -> Result<(), String> {
+	// First, test the Oauth client: we can perform a rate limit check if the OAuth backend is MobileSpoof; if GenericWeb, we skip the check.
+	if matches!(OAUTH_CLIENT.load().backend, OauthBackendImpl::GenericWeb(_)) {
+		warn!("[⚠️] Cannot perform rate limit check, running as GenericWeb. Skipping check.");
+		return Ok(());
+	}
+
 	// First, check a subreddit.
 	self_check("reddit").await?;
 	// This will reduce the rate limit to 99. Assert this check.
 	if OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst) != 99 {
-		return Err(format!("Rate limit check failed: expected 99, got {}", OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst)));
+		return Err(format!("Rate limit check 1 failed: expected 99, got {}", OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst)));
 	}
 	// Now, we switch out the OAuth client.
 	// This checks for the IP rate limit association.
@@ -507,7 +513,7 @@ pub async fn rate_limit_check() -> Result<(), String> {
 	self_check("rust").await?;
 	// Again, assert the rate limit check.
 	if OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst) != 99 {
-		return Err(format!("Rate limit check failed: expected 99, got {}", OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst)));
+		return Err(format!("Rate limit check 2 failed: expected 99, got {}", OAUTH_RATELIMIT_REMAINING.load(Ordering::SeqCst)));
 	}
 
 	Ok(())