opsgenie : trim space for api key file (prometheus#4195)

* opsgenie : trim space for api key file

Signed-off-by: zoov-xavier <[email protected]>

* fix lint checking error

Signed-off-by: gotjosh <[email protected]>

---------

Signed-off-by: zoov-xavier <[email protected]>
Signed-off-by: gotjosh <[email protected]>
Co-authored-by: gotjosh <[email protected]>

Author: zoov-xavier

notify/opsgenie/api_key_file

@@ -0,0 +1,2 @@
+my_secret_api_key
+

notify/opsgenie/opsgenie.go

@@ -282,6 +282,7 @@ func (n *Notifier) createRequests(ctx context.Context, as ...*types.Alert) ([]*h
 			return nil, false, fmt.Errorf("read key_file error: %w", err)
 		}
 		apiKey = tmpl(string(content))
+		apiKey = strings.TrimSpace(string(apiKey))
 	}
 
 	if err != nil {

notify/opsgenie/opsgenie_test.go

@@ -321,6 +321,25 @@ func TestOpsGenieWithUpdate(t *testing.T) {
 `, body2)
 }
 
+func TestOpsGenieApiKeyFile(t *testing.T) {
+	u, err := url.Parse("https://test-opsgenie-url")
+	require.NoError(t, err)
+	tmpl := test.CreateTmpl(t)
+	ctx := context.Background()
+	ctx = notify.WithGroupKey(ctx, "1")
+	opsGenieConfigWithUpdate := config.OpsGenieConfig{
+		APIKeyFile: `./api_key_file`,
+		APIURL:     &config.URL{URL: u},
+		HTTPConfig: &commoncfg.HTTPClientConfig{},
+	}
+	notifierWithUpdate, err := New(&opsGenieConfigWithUpdate, tmpl, promslog.NewNopLogger())
+
+	require.NoError(t, err)
+	requests, _, err := notifierWithUpdate.createRequests(ctx)
+	require.NoError(t, err)
+	require.Equal(t, "GenieKey my_secret_api_key", requests[0].Header.Get("Authorization"))
+}
+
 func readBody(t *testing.T, r *http.Request) string {
 	t.Helper()
 	body, err := io.ReadAll(r.Body)