Plugins: AuthType in route configuration and params interpolation (#33674)

* AuthType in route configuration

* Pass interpolated auth parameters to token provider

* Unit tests

* Update after review

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

Fixes #33669
Closed #33732

pkg/api/pluginproxy/ds_auth_provider_test.go

@@ -0,0 +1,62 @@
+package pluginproxy
+
+import (
+	"testing"
+
+	"github.com/grafana/grafana/pkg/plugins"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestApplyRoute_interpolateAuthParams(t *testing.T) {
+	pluginRoute := &plugins.AppPluginRoute{
+		Path:   "pathwithjwttoken1",
+		URL:    "https://api.jwt.io/some/path",
+		Method: "GET",
+		TokenAuth: &plugins.JwtTokenAuth{
+			Url: "https://login.server.com/{{.JsonData.tenantId}}/oauth2/token",
+			Scopes: []string{
+				"https://www.testapi.com/auth/Read.All",
+				"https://www.testapi.com/auth/Write.All",
+			},
+			Params: map[string]string{
+				"token_uri":    "{{.JsonData.tokenUri}}",
+				"client_email": "{{.JsonData.clientEmail}}",
+				"private_key":  "{{.SecureJsonData.privateKey}}",
+			},
+		},
+	}
+
+	templateData := templateData{
+		JsonData: map[string]interface{}{
+			"clientEmail": "test@test.com",
+			"tokenUri":    "login.url.com/token",
+			"tenantId":    "f09c86ac",
+		},
+		SecureJsonData: map[string]string{
+			"privateKey": "testkey",
+		},
+	}
+
+	t.Run("should interpolate JwtTokenAuth struct using given JsonData", func(t *testing.T) {
+		interpolated, err := interpolateAuthParams(pluginRoute.TokenAuth, templateData)
+		require.NoError(t, err)
+		require.NotNil(t, interpolated)
+
+		assert.Equal(t, "https://login.server.com/f09c86ac/oauth2/token", interpolated.Url)
+
+		assert.Equal(t, 2, len(interpolated.Scopes))
+		assert.Equal(t, "https://www.testapi.com/auth/Read.All", interpolated.Scopes[0])
+		assert.Equal(t, "https://www.testapi.com/auth/Write.All", interpolated.Scopes[1])
+
+		assert.Equal(t, "login.url.com/token", interpolated.Params["token_uri"])
+		assert.Equal(t, "test@test.com", interpolated.Params["client_email"])
+		assert.Equal(t, "testkey", interpolated.Params["private_key"])
+	})
+
+	t.Run("should return Nil if given JwtTokenAuth is Nil", func(t *testing.T) {
+		interpolated, err := interpolateAuthParams(pluginRoute.JwtTokenAuth, templateData)
+		require.NoError(t, err)
+		require.Nil(t, interpolated)
+	})
+}