Начало положено...

elyby-api/Cargo.toml

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+[package]
+name = "elyby-api"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.83"
+log = "0.4.21"
+reqwest = "0.12.4"
+serde = { version = "1.0.201", features = ["derive"] }
+serde_json = "1.0.117"
+tokio = { version = "1.37.0", features = ["full"] }

elyby-api/src/lib.rs

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+use anyhow::{anyhow, Result};
+use log::debug;
+
+pub async fn has_joined(server_id: &str, username: &str) -> Result<bool> {
+    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),
+        _ => Err(anyhow!("Unknown code: {}", res.status().as_u16()))
+    }
+}
+
+#[tokio::test]
+async fn test_has_joined() {
+    let result = has_joined("0f8fef917f1f62b963804d822b67fe6f59aad7d", "test").await.unwrap();
+    assert_eq!(result, false)
+}
+
+// #[cfg(test)]
+// mod tests {
+//     use super::*;
+
+//     #[test]
+//     fn it_works() {
+//         let result = add(2, 2);
+//         assert_eq!(result, 4);
+//     }
+// }