Оно работает!

Почищу код позже...

elyby-api/Cargo.toml

@@ -8,7 +8,8 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.83"
 log = "0.4.21"
-reqwest = "0.12.4"
+reqwest = { version = "0.12.4" }
 serde = { version = "1.0.201", features = ["derive"] }
 serde_json = "1.0.117"
 tokio = { version = "1.37.0", features = ["full"] }
+uuid = "1.8.0"

elyby-api/src/lib.rs

@@ -1,14 +1,20 @@
 use anyhow::{anyhow, Result};
 use log::debug;
+use serde_json::Value;
+use uuid::Uuid;
 
-pub async fn has_joined(server_id: &str, username: &str) -> Result<bool> {
+pub async fn has_joined(server_id: &str, username: &str) -> Result<Option<Uuid>> {
     let client = reqwest::Client::new();
     let res = client.get(
         format!("http://minecraft.ely.by/session/hasJoined?serverId={server_id}&username={username}")).send().await?;
     debug!("{res:?}");
     match res.status().as_u16() {
-        200 => Ok(true),
-        401 => Ok(false),
+        200 => {
+            let json = serde_json::from_str::<Value>(&res.text().await?)?;
+            let uuid = Uuid::parse_str(json["id"].as_str().unwrap())?;
+            Ok(Some(uuid))
+        },
+        401 => Ok(None),
         _ => Err(anyhow!("Unknown code: {}", res.status().as_u16()))
     }
 }
@@ -16,7 +22,7 @@ pub async fn has_joined(server_id: &str, username: &str) -> Result<bool> {
 #[tokio::test]
 async fn test_has_joined() {
     let result = has_joined("0f8fef917f1f62b963804d822b67fe6f59aad7d", "test").await.unwrap();
-    assert_eq!(result, false)
+    assert_eq!(result, None)
 }
 
 // #[cfg(test)]