add refresh tokens

api/src/Services/JwtService.cs

@@ -1,17 +1,21 @@
 
 using Microsoft.IdentityModel.Tokens;
+using Microsoft.EntityFrameworkCore;
 using System.Text;
 using System.Security.Claims;
 using System.IdentityModel.Tokens.Jwt;
+using System.Security.Cryptography;
 
 using agologumApi.Models;
 
 public class JwtService {
 
     private readonly IConfiguration config_;
+    private readonly AppDbContext db_;
 
-    public JwtService(IConfiguration config) { // why the heck does c# not have initializer lists ?
+    public JwtService(IConfiguration config, AppDbContext db) { // why the heck does c# not have initializer lists ?
         config_ = config;
+        db_ = db;
     }
 
     public string? GenerateJwt(User user) {
@@ -42,5 +46,27 @@ public class JwtService {
 
     }
 
+    public string GenerateRefreshToken() {
+
+        byte[] randomBytes = new byte[64];
+        RandomNumberGenerator.Fill(randomBytes.AsSpan());
+        return Convert.ToBase64String(randomBytes);
+
+    }
+
+    public async Task<RefreshToken?> GetRefreshToken(string refreshTokenString) {
+        return await db_.RefreshTokens.FirstOrDefaultAsync(u => u.Token == refreshTokenString);
+    }
+
+    public async Task<RefreshToken> AddRefreshToken(RefreshToken refreshToken) {
+        db_.RefreshTokens.Add(refreshToken);
+        await db_.SaveChangesAsync();
+        return refreshToken;
+    }
+
+    // helper to get the User from the id that exists in a refresh token object
+    public async Task<User?> GetUser(string id) {
+        return await db_.Users.FindAsync(id);
+    }
 
 }