Fix IDP Manager config structs with correct tags (#253)

* Fix IDP Manager config structs with correct tags

When loading the configuration from file
we will use the Auth0ClientConfig and when
sending the post to retrieve a token
 we use the auth0JWTRequest with proper tags

 Also, removed the idle timeout as it was closing
 all idle connections

management/server/idp/auth0_test.go

@@ -3,6 +3,7 @@ package idp
 import (
 	"encoding/json"
 	"fmt"
+	"github.com/stretchr/testify/require"
 	"io/ioutil"
 	"net/http"
 	"strings"
@@ -402,3 +403,64 @@ func TestAuth0_UpdateUserAppMetadata(t *testing.T) {
 		})
 	}
 }
+
+func TestNewAuth0Manager(t *testing.T) {
+	type test struct {
+		name                 string
+		inputConfig          Auth0ClientConfig
+		assertErrFunc        require.ErrorAssertionFunc
+		assertErrFuncMessage string
+	}
+
+	defaultTestConfig := Auth0ClientConfig{
+		AuthIssuer:   "https://abc-auth0.eu.auth0.com",
+		Audience:     "https://abc-auth0.eu.auth0.com/api/v2/",
+		ClientID:     "abcdefg",
+		ClientSecret: "supersecret",
+		GrantType:    "client_credentials",
+	}
+
+	testCase1 := test{
+		name:                 "Good Scenario With Config",
+		inputConfig:          defaultTestConfig,
+		assertErrFunc:        require.NoError,
+		assertErrFuncMessage: "shouldn't return error",
+	}
+
+	testCase2Config := defaultTestConfig
+	testCase2Config.ClientID = ""
+
+	testCase2 := test{
+		name:                 "Missing Configuration",
+		inputConfig:          testCase2Config,
+		assertErrFunc:        require.Error,
+		assertErrFuncMessage: "shouldn't return error when field empty",
+	}
+
+	testCase3Config := defaultTestConfig
+	testCase3Config.AuthIssuer = "abc-auth0.eu.auth0.com"
+
+	testCase3 := test{
+		name:                 "Wrong Auth Issuer Format",
+		inputConfig:          testCase3Config,
+		assertErrFunc:        require.Error,
+		assertErrFuncMessage: "should return error when wrong auth issuer format",
+	}
+
+	testCase4Config := defaultTestConfig
+	testCase4Config.GrantType = "spa"
+
+	testCase4 := test{
+		name:                 "Wrong Grant Type",
+		inputConfig:          testCase4Config,
+		assertErrFunc:        require.Error,
+		assertErrFuncMessage: "should return error when wrong grant type",
+	}
+
+	for _, testCase := range []test{testCase1, testCase2, testCase3, testCase4} {
+		t.Run(testCase.name, func(t *testing.T) {
+			_, err := NewAuth0Manager(testCase.inputConfig)
+			testCase.assertErrFunc(t, err, testCase.assertErrFuncMessage)
+		})
+	}
+}