Revert "revert auth json (#6883)" (#6889)

This reverts commit d965c4c.

### Description
Basically putting back `auth.json` stuff.

### Testing Instructions
Build Turborepo


Closes TURBO-1993

crates/turborepo-api-client/src/lib.rs

@@ -13,7 +13,8 @@ use serde::Deserialize;
 use turborepo_ci::{is_ci, Vendor};
 use turborepo_vercel_api::{
     APIError, CachingStatus, CachingStatusResponse, PreflightResponse, SpacesResponse, Team,
-    TeamsResponse, UserResponse, VerificationResponse, VerifiedSsoUser,
+    TeamsResponse, TokenMetadata, TokenMetadataResponse, UserResponse, VerificationResponse,
+    VerifiedSsoUser,
 };
 use url::Url;
 
@@ -32,6 +33,7 @@ lazy_static! {
 
 #[async_trait]
 pub trait Client {
+    fn base_url(&self) -> &str;
     async fn get_user(&self, token: &str) -> Result<UserResponse>;
     async fn get_teams(&self, token: &str) -> Result<TeamsResponse>;
     async fn get_team(&self, token: &str, team_id: &str) -> Result<Option<Team>>;
@@ -44,6 +46,7 @@ pub trait Client {
     ) -> Result<CachingStatusResponse>;
     async fn get_spaces(&self, token: &str, team_id: Option<&str>) -> Result<SpacesResponse>;
     async fn verify_sso_token(&self, token: &str, token_name: &str) -> Result<VerifiedSsoUser>;
+    async fn get_token_metadata(&self, token: &str) -> Result<TokenMetadata>;
     #[allow(clippy::too_many_arguments)]
     async fn put_artifact(
         &self,
@@ -105,6 +108,24 @@ pub struct APIAuth {
 
 #[async_trait]
 impl Client for APIClient {
+    fn base_url(&self) -> &str {
+        &self.base_url
+    }
+    async fn get_token_metadata(&self, token: &str) -> Result<TokenMetadata> {
+        let url = self.make_url("/v5/user/tokens/current");
+        let request_builder = self
+            .client
+            .get(url)
+            .header("User-Agent", self.user_agent.clone())
+            .header("Authorization", format!("Bearer {}", token))
+            .header("Content-Type", "application/json");
+        let response = retry::make_retryable_request(request_builder)
+            .await?
+            .error_for_status()?;
+        let json: TokenMetadataResponse = response.json().await?;
+
+        Ok(json.token)
+    }
     async fn get_user(&self, token: &str) -> Result<UserResponse> {
         let url = self.make_url("/v2/user");
         let request_builder = self

crates/turborepo-auth/Cargo.toml

@@ -13,13 +13,17 @@ async-trait.workspace = true
 axum-server = { workspace = true }
 axum.workspace = true
 chrono.workspace = true
+dirs-next = "2.0.0"
 hostname = "0.3.1"
 lazy_static.workspace = true
 reqwest.workspace = true
 serde.workspace = true
+serde_json.workspace = true
+tempfile.workspace = true
 thiserror = "1.0.38"
 tokio.workspace = true
 tracing.workspace = true
+turbopath = { workspace = true }
 turborepo-api-client = { workspace = true }
 turborepo-ui.workspace = true
 turborepo-vercel-api = { workspace = true }