DXCDT-247: Update email provider if already existing when creating it

internal/provider/resource_auth0_email.go

@@ -116,13 +116,17 @@ func newEmail() *schema.Resource {
 func createEmail(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
 	api := m.(*management.Management)
 
+	d.SetId(resource.UniqueId())
+
+	if emailProviderIsConfigured(api) {
+		return updateEmail(ctx, d, m)
+	}
+
 	email := expandEmail(d.GetRawConfig())
 	if err := api.Email.Create(email); err != nil {
 		return diag.FromErr(err)
 	}
 
-	d.SetId(resource.UniqueId())
-
 	return readEmail(ctx, d, m)
 }
 
@@ -171,6 +175,15 @@ func deleteEmail(ctx context.Context, d *schema.ResourceData, m interface{}) dia
 	return nil
 }
 
+func emailProviderIsConfigured(api *management.Management) bool {
+	_, err := api.Email.Read()
+	if err, ok := err.(management.Error); ok && err.Status() == http.StatusNotFound {
+		return false
+	}
+
+	return true
+}
+
 func expandEmail(config cty.Value) *management.Email {
 	email := &management.Email{
 		Name:               value.String(config.GetAttr("name")),

internal/provider/resource_auth0_email_test.go

@@ -1,9 +1,13 @@
 package provider
 
 import (
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
+	"github.com/auth0/go-auth0/management"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/stretchr/testify/assert"
 
 	"github.com/auth0/terraform-provider-auth0/internal/recorder"
 )
@@ -113,6 +117,81 @@ func TestAccEmail(t *testing.T) {
 					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "credentials.0.region", "eu"),
 				),
 			},
+			{
+				Config: `
+				resource "auth0_email" "my_email_provider" {
+					name = "mailgun"
+					enabled = false
+					default_from_address = ""
+					credentials {
+						api_key = "MAILGUNXXXXXXXXXXXXXXX"
+						domain = "example.com"
+						region = "eu"
+					}
+				}
+
+				resource "auth0_email" "no_conflict_email_provider" {
+					depends_on = [ auth0_email.my_email_provider ]
+
+					name = "mailgun"
+					enabled = false
+					default_from_address = ""
+					credentials {
+						api_key = "MAILGUNXXXXXXXXXXXXXXX"
+						domain = "example.com"
+						region = "eu"
+					}
+				}
+				`,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "name", "mailgun"),
+					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "enabled", "false"),
+					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "default_from_address", ""),
+					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "credentials.0.domain", "example.com"),
+					resource.TestCheckResourceAttr("auth0_email.my_email_provider", "credentials.0.region", "eu"),
+					resource.TestCheckResourceAttr("auth0_email.no_conflict_email_provider", "name", "mailgun"),
+					resource.TestCheckResourceAttr("auth0_email.no_conflict_email_provider", "enabled", "false"),
+					resource.TestCheckResourceAttr("auth0_email.no_conflict_email_provider", "default_from_address", ""),
+					resource.TestCheckResourceAttr("auth0_email.no_conflict_email_provider", "credentials.0.domain", "example.com"),
+					resource.TestCheckResourceAttr("auth0_email.no_conflict_email_provider", "credentials.0.region", "eu"),
+				),
+			},
 		},
 	})
 }
+
+func TestEmailProviderIsConfigured(t *testing.T) {
+	t.Run("it returns true if the provider is configured", func(t *testing.T) {
+		testHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if r.URL.Path == "/api/v2/emails/provider" {
+				w.WriteHeader(http.StatusOK)
+				return
+			}
+			http.NotFound(w, r)
+		})
+		testServer := httptest.NewServer(testHandler)
+
+		api, err := management.New(testServer.URL, management.WithInsecure())
+		assert.NoError(t, err)
+
+		actual := emailProviderIsConfigured(api)
+		assert.True(t, actual)
+	})
+
+	t.Run("it returns false if the provider is not configured", func(t *testing.T) {
+		testHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if r.URL.Path == "/api/v2/emails/provider" {
+				http.NotFound(w, r)
+				return
+			}
+			http.NotFound(w, r)
+		})
+		testServer := httptest.NewServer(testHandler)
+
+		api, err := management.New(testServer.URL, management.WithInsecure())
+		assert.NoError(t, err)
+
+		actual := emailProviderIsConfigured(api)
+		assert.False(t, actual)
+	})
+}