LINE Login

DependencyInjection.cs

   services.AddAuthentication()
                .AddOpenIdConnect("Line", "Line", options =>
                {
                    options.CallbackPath = "/signin-line";
                    options.Scope.Add("openid");
                    options.Scope.Add("profile");
                    options.Scope.Add("email");
                    options.RequireHttpsMetadata = true;
                    options.SaveTokens = true;
                    options.GetClaimsFromUserInfoEndpoint = true;
                    CustomOpenIdConnectOptions identityOption = new();
                    configuration.Bind("Authentication:LineLogin", identityOption);
                    options.ClientId = identityOption.ClientId;
                    options.ClientSecret = identityOption.ClientSecret;
                    options.Configuration = new OpenIdConnectConfiguration()
                    {
                        Issuer = "https://access.line.me",
                        AuthorizationEndpoint = "https://access.line.me/oauth2/v2.1/authorize",
                        TokenEndpoint = "https://api.line.me/oauth2/v2.1/token",
                        UserInfoEndpoint = "https://api.line.me/oauth2/v2.1/userinfo"
                    };
                    // options.Prompt = "consent";
                    options.ResponseType = OpenIdConnectResponseType.Code;
                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        SignatureValidator = delegate(string token, TokenValidationParameters parameters)
                        {
                            try
                            {
                                var jwt = JWT.Decode<Dictionary<string, object>>(token,
                                    Encoding.UTF8.GetBytes(identityOption.ClientSecret), JwsAlgorithm.HS256);
                                if (jwt.Count >= 0)
                                {
                                    // var jwtReturn = new JwtSecurityToken(token);

                                    var returnedToken = new Microsoft.IdentityModel.JsonWebTokens.JsonWebToken(token);
                                    return returnedToken;
                                    // return jwtReturn;
                                }
                                else
                                {
                                    return null;
                                }
                            }
                            catch (Exception)
                            {
                                return null;
                            }
                        }
                    };
                });