[b66b3ac] | 1 | namespace backend.Services;
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| 2 |
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[057037b] | 3 | using backend.Data;
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| 4 | using backend.DTOs;
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[b66b3ac] | 5 | using backend.Entities;
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| 6 | using backend.Helpers;
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| 7 | using backend.Models;
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[057037b] | 8 | using Microsoft.EntityFrameworkCore;
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[b66b3ac] | 9 | using Microsoft.Extensions.Options;
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| 10 | using Microsoft.IdentityModel.Tokens;
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| 11 | using System.IdentityModel.Tokens.Jwt;
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| 12 | using System.Security.Claims;
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| 13 |
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| 14 | public interface IUserService
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| 15 | {
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[057037b] | 16 | Task<AuthenticateResponse> Authenticate(AuthenticateRequest model);
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| 17 | Task<AuthenticateResponse> Register(CreateUserRequest req);
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| 18 | Task<User> GetById(int id);
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[b66b3ac] | 19 | }
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| 20 |
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| 21 | public class UserService : IUserService
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| 22 | {
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| 23 | private readonly AppSettings _appSettings;
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[057037b] | 24 | private readonly DataContext _context = null;
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[b66b3ac] | 25 |
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[057037b] | 26 | public UserService(IOptions<AppSettings> appSettings, DataContext context)
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[b66b3ac] | 27 | {
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| 28 | _appSettings = appSettings.Value;
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[057037b] | 29 | _context = context;
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[b66b3ac] | 30 | }
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| 31 |
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[057037b] | 32 | public async Task<AuthenticateResponse> Authenticate(AuthenticateRequest model)
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[b66b3ac] | 33 | {
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[057037b] | 34 | User user = await _context.Users.FirstOrDefaultAsync(x => x.Email == model.Email && x.Password == model.Password);
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[b66b3ac] | 35 |
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| 36 | // return null if user not found
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| 37 | if (user == null) return null;
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| 38 |
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| 39 | // authentication successful so generate jwt token
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| 40 | var token = generateJwtToken(user);
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| 41 |
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[057037b] | 42 | return new AuthenticateResponse { Email = user.Email, Id = user.Id, Token = token};
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| 43 | }
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| 44 |
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| 45 | public async Task<User> GetById(int id)
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| 46 | {
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| 47 | return await _context.Users.FindAsync(id);
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[b66b3ac] | 48 | }
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| 49 |
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[057037b] | 50 | public async Task<AuthenticateResponse> Register(CreateUserRequest req)
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[b66b3ac] | 51 | {
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[057037b] | 52 | User user = new User() { Email = req.Email, Password = req.Password };
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| 53 | await _context.Users.AddAsync(user);
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| 54 | await _context.SaveChangesAsync();
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| 55 | var token = generateJwtToken(user);
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| 56 | return new AuthenticateResponse { Email = user.Email, Id = user.Id, Token = token };
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[b66b3ac] | 57 | }
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| 58 |
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| 59 | private string generateJwtToken(User user)
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| 60 | {
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| 61 | // generate token that is valid for 7 days
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| 62 | var tokenHandler = new JwtSecurityTokenHandler();
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[057037b] | 63 | var key = System.Text.Encoding.ASCII.GetBytes(_appSettings.Secret);
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[b66b3ac] | 64 | var tokenDescriptor = new SecurityTokenDescriptor
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| 65 | {
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| 66 | Subject = new ClaimsIdentity(new[] { new Claim("id", user.Id.ToString()) }),
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| 67 | Expires = DateTime.UtcNow.AddDays(7),
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| 68 | SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
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| 69 | };
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| 70 | var token = tokenHandler.CreateToken(tokenDescriptor);
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| 71 | return tokenHandler.WriteToken(token);
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| 72 | }
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| 73 | } |
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