[MM-29845] Add a new handler to allow authentication via CWS API Key (#16319)

* Add a new handler to allow authentication via CWS API Key

* Make error better

* Add tests and cases for new handler functions

* Move some code around

* Add test for GetCloudSession function

* unset the env after test completion

* Remove white space

* Change Info to Warn

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/session_test.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"fmt"
+	"os"
 	"testing"
 	"time"
 
@@ -404,3 +405,35 @@ func TestApp_SetSessionExpireInDays(t *testing.T) {
 		})
 	}
 }
+
+func TestGetCloudSession(t *testing.T) {
+	th := Setup(t)
+	defer func() {
+		os.Unsetenv("MM_CLOUD_API_KEY")
+		th.TearDown()
+	}()
+
+	t.Run("Matching environment variable and token should return non-nil session", func(t *testing.T) {
+		os.Setenv("MM_CLOUD_API_KEY", "mytoken")
+		session, err := th.App.GetCloudSession("mytoken")
+		require.Nil(t, err)
+		require.NotNil(t, session)
+		require.Equal(t, "mytoken", session.Token)
+	})
+
+	t.Run("Empty environment variable should return error", func(t *testing.T) {
+		os.Setenv("MM_CLOUD_API_KEY", "")
+		session, err := th.App.GetCloudSession("mytoken")
+		require.Nil(t, session)
+		require.NotNil(t, err)
+		require.Equal(t, "api.context.invalid_token.error", err.Id)
+	})
+
+	t.Run("Mismatched env variable and token should return error", func(t *testing.T) {
+		os.Setenv("MM_CLOUD_API_KEY", "mytoken")
+		session, err := th.App.GetCloudSession("myincorrecttoken")
+		require.Nil(t, session)
+		require.NotNil(t, err)
+		require.Equal(t, "api.context.invalid_token.error", err.Id)
+	})
+}