Added Json Web Tokens

Also down migration for users

backend/src/cookie/jwt.rs

@@ -0,0 +1,37 @@
+use axum::{Json, http::StatusCode};
+use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation, decode, encode};
+use serde::{Deserialize, Serialize};
+
+use crate::models::Claims;
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Error {
+    pub status: &'static str,
+    pub message: String,
+}
+
+pub fn encode_token(header: &Header, id: String, key: &EncodingKey) -> String {
+    let now = chrono::Utc::now();
+    let issued = now.timestamp() as usize;
+    let expires = (now + chrono::Duration::minutes(90)).timestamp() as usize;
+    let claims: Claims = Claims {
+        subject: id,
+        issued: issued,
+        expires: expires,
+    };
+    let token = encode(header, &claims, key);
+    return token.expect("token return failed");
+}
+
+pub fn decode_token(token: String, key: &DecodingKey) -> Result<Claims, (StatusCode, Json<Error>)> {
+    let claims = decode::<Claims>(&token, key, &Validation::default())
+        .map_err(|_| {
+            let error = Error {
+                status: "error",
+                message: "Invalid Token".to_string(),
+            };
+            (StatusCode::UNAUTHORIZED, Json(error))
+        })?
+        .claims;
+    return Ok(claims);
+}