LDAP: Add API endpoint to query the LDAP server(s) status (#18868)

* LDAP: Add API endpoint to query the LDAP server(s) status|

This endpoint returns the current status(es) of the configured LDAP server(s).

The status of each server is verified by dialling and if no error is returned we assume the server is operational.

This is the last piece I'll produce as an API before moving into #18759 and see the view come to life.

pkg/api/api.go

@@ -396,6 +396,7 @@ func (hs *HTTPServer) registerRoutes() {
 		adminRoute.Post("/provisioning/notifications/reload", Wrap(hs.AdminProvisioningReloadNotifications))
 		adminRoute.Post("/ldap/reload", Wrap(hs.ReloadLDAPCfg))
 		adminRoute.Get("/ldap/:username", Wrap(hs.GetUserFromLDAP))
+		adminRoute.Get("/ldap/status", Wrap(hs.GetLDAPStatus))
 	}, reqGrafanaAdmin)
 
 	// rendering

pkg/api/ldap_debug.go

@@ -86,25 +86,75 @@ func (user *LDAPUserDTO) FetchOrgs() error {
 	return nil
 }
 
+// LDAPServerDTO is a serializer for LDAP server statuses
+type LDAPServerDTO struct {
+	Host      string `json:"host"`
+	Port      int    `json:"port"`
+	Available bool   `json:"available"`
+	Error     string `json:"error"`
+}
+
 // ReloadLDAPCfg reloads the LDAP configuration
 func (server *HTTPServer) ReloadLDAPCfg() Response {
 	if !ldap.IsEnabled() {
-		return Error(400, "LDAP is not enabled", nil)
+		return Error(http.StatusBadRequest, "LDAP is not enabled", nil)
 	}
 
 	err := ldap.ReloadConfig()
 	if err != nil {
-		return Error(500, "Failed to reload ldap config.", err)
+		return Error(http.StatusInternalServerError, "Failed to reload ldap config.", err)
 	}
 	return Success("LDAP config reloaded")
 }
 
-// GetUserFromLDAP finds an user based on a username in LDAP. This helps illustrate how would the particular user be mapped in Grafana when synced.
-func (server *HTTPServer) GetUserFromLDAP(c *models.ReqContext) Response {
+// GetLDAPStatus attempts to connect to all the configured LDAP servers and returns information on whenever they're availabe or not.
+func (server *HTTPServer) GetLDAPStatus(c *models.ReqContext) Response {
+	if !ldap.IsEnabled() {
+		return Error(http.StatusBadRequest, "LDAP is not enabled", nil)
+	}
+
 	ldapConfig, err := getLDAPConfig()
 
 	if err != nil {
-		return Error(400, "Failed to obtain the LDAP configuration. Please ", err)
+		return Error(http.StatusBadRequest, "Failed to obtain the LDAP configuration. Please verify the configuration and try again.", err)
+	}
+
+	ldap := newLDAP(ldapConfig.Servers)
+
+	statuses, err := ldap.Ping()
+
+	if err != nil {
+		return Error(http.StatusBadRequest, "Failed to connect to the LDAP server(s)", err)
+	}
+
+	serverDTOs := []*LDAPServerDTO{}
+	for _, status := range statuses {
+		s := &LDAPServerDTO{
+			Host:      status.Host,
+			Available: status.Available,
+			Port:      status.Port,
+		}
+
+		if status.Error != nil {
+			s.Error = status.Error.Error()
+		}
+
+		serverDTOs = append(serverDTOs, s)
+	}
+
+	return JSON(http.StatusOK, serverDTOs)
+}
+
+// GetUserFromLDAP finds an user based on a username in LDAP. This helps illustrate how would the particular user be mapped in Grafana when synced.
+func (server *HTTPServer) GetUserFromLDAP(c *models.ReqContext) Response {
+	if !ldap.IsEnabled() {
+		return Error(http.StatusBadRequest, "LDAP is not enabled", nil)
+	}
+
+	ldapConfig, err := getLDAPConfig()
+
+	if err != nil {
+		return Error(http.StatusBadRequest, "Failed to obtain the LDAP configuration. Please ", err)
 	}
 
 	ldap := newLDAP(ldapConfig.Servers)

pkg/api/ldap_debug_test.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"encoding/json"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -21,6 +22,12 @@ type LDAPMock struct {
 
 var userSearchResult *models.ExternalUserInfo
 var userSearchConfig ldap.ServerConfig
+var pingResult []*multildap.ServerStatus
+var pingError error
+
+func (m *LDAPMock) Ping() ([]*multildap.ServerStatus, error) {
+	return pingResult, pingError
+}
 
 func (m *LDAPMock) Login(query *models.LoginUserQuery) (*models.ExternalUserInfo, error) {
 	return &models.ExternalUserInfo{}, nil
@@ -35,11 +42,19 @@ func (m *LDAPMock) User(login string) (*models.ExternalUserInfo, ldap.ServerConf
 	return userSearchResult, userSearchConfig, nil
 }
 
+//***
+// GetUserFromLDAP tests
+//***
+
 func getUserFromLDAPContext(t *testing.T, requestURL string) *scenarioContext {
 	t.Helper()
 
 	sc := setupScenarioContext(requestURL)
 
+	ldap := setting.LDAPEnabled
+	setting.LDAPEnabled = true
+	defer func() { setting.LDAPEnabled = ldap }()
+
 	hs := &HTTPServer{Cfg: setting.NewCfg()}
 
 	sc.defaultHandler = Wrap(func(c *models.ReqContext) Response {
@@ -141,7 +156,7 @@ func TestGetUserFromLDAPApiEndpoint_OrgNotfound(t *testing.T) {
 	var expectedJSON interface{}
 	_ = json.Unmarshal([]byte(expected), &expectedJSON)
 
-	assert.Equal(t, jsonResponse, expectedJSON)
+	assert.Equal(t, expectedJSON, jsonResponse)
 }
 
 func TestGetUserFromLDAPApiEndpoint(t *testing.T) {
@@ -219,5 +234,70 @@ func TestGetUserFromLDAPApiEndpoint(t *testing.T) {
 	var expectedJSON interface{}
 	_ = json.Unmarshal([]byte(expected), &expectedJSON)
 
-	assert.Equal(t, jsonResponse, expectedJSON)
+	assert.Equal(t, expectedJSON, jsonResponse)
+}
+
+//***
+// GetLDAPStatus tests
+//***
+
+func getLDAPStatusContext(t *testing.T) *scenarioContext {
+	t.Helper()
+
+	requestURL := "/api/admin/ldap/status"
+	sc := setupScenarioContext(requestURL)
+
+	ldap := setting.LDAPEnabled
+	setting.LDAPEnabled = true
+	defer func() { setting.LDAPEnabled = ldap }()
+
+	hs := &HTTPServer{Cfg: setting.NewCfg()}
+
+	sc.defaultHandler = Wrap(func(c *models.ReqContext) Response {
+		sc.context = c
+		return hs.GetLDAPStatus(c)
+	})
+
+	sc.m.Get("/api/admin/ldap/status", sc.defaultHandler)
+
+	sc.resp = httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, requestURL, nil)
+	sc.req = req
+	sc.exec()
+
+	return sc
+}
+
+func TestGetLDAPStatusApiEndpoint(t *testing.T) {
+	pingResult = []*multildap.ServerStatus{
+		{Host: "10.0.0.3", Port: 361, Available: true, Error: nil},
+		{Host: "10.0.0.3", Port: 362, Available: true, Error: nil},
+		{Host: "10.0.0.5", Port: 361, Available: false, Error: errors.New("something is awfully wrong")},
+	}
+
+	getLDAPConfig = func() (*ldap.Config, error) {
+		return &ldap.Config{}, nil
+	}
+
+	newLDAP = func(_ []*ldap.ServerConfig) multildap.IMultiLDAP {
+		return &LDAPMock{}
+	}
+
+	sc := getLDAPStatusContext(t)
+
+	require.Equal(t, http.StatusOK, sc.resp.Code)
+	jsonResponse, err := getJSONbody(sc.resp)
+	assert.Nil(t, err)
+
+	expected := `
+	[
+		{ "host": "10.0.0.3", "port": 361, "available": true, "error": "" },
+		{ "host": "10.0.0.3", "port": 362, "available": true, "error": "" },
+		{ "host": "10.0.0.5", "port": 361, "available": false, "error": "something is awfully wrong" }
+	]
+	`
+	var expectedJSON interface{}
+	_ = json.Unmarshal([]byte(expected), &expectedJSON)
+
+	assert.Equal(t, expectedJSON, jsonResponse)
 }

pkg/login/ldap_login_test.go

@@ -73,6 +73,13 @@ func TestLDAPLogin(t *testing.T) {
 type mockAuth struct {
 	validLogin  bool
 	loginCalled bool
+	pingCalled  bool
+}
+
+func (auth *mockAuth) Ping() ([]*multildap.ServerStatus, error) {
+	auth.pingCalled = true
+
+	return nil, nil
 }
 
 func (auth *mockAuth) Login(query *models.LoginUserQuery) (

pkg/services/multildap/multildap.go

@@ -28,8 +28,17 @@ var ErrNoLDAPServers = errors.New("No LDAP servers are configured")
 // ErrDidNotFindUser if request for user is unsuccessful
 var ErrDidNotFindUser = errors.New("Did not find a user")
 
+// ServerStatus holds the LDAP server status
+type ServerStatus struct {
+	Host      string
+	Port      int
+	Available bool
+	Error     error
+}
+
 // IMultiLDAP is interface for MultiLDAP
 type IMultiLDAP interface {
+	Ping() ([]*ServerStatus, error)
 	Login(query *models.LoginUserQuery) (
 		*models.ExternalUserInfo, error,
 	)
@@ -55,6 +64,39 @@ func New(configs []*ldap.ServerConfig) IMultiLDAP {
 	}
 }
 
+// Ping dials each of the LDAP servers and returns their status. If the server is unavailable, it also returns the error.
+func (multiples *MultiLDAP) Ping() ([]*ServerStatus, error) {
+
+	if len(multiples.configs) == 0 {
+		return nil, ErrNoLDAPServers
+	}
+
+	serverStatuses := []*ServerStatus{}
+	for _, config := range multiples.configs {
+
+		status := &ServerStatus{}
+
+		status.Host = config.Host
+		status.Port = config.Port
+
+		server := newLDAP(config)
+		err := server.Dial()
+
+		if err == nil {
+			status.Available = true
+			serverStatuses = append(serverStatuses, status)
+		} else {
+			status.Available = false
+			status.Error = err
+			serverStatuses = append(serverStatuses, status)
+		}
+
+		defer server.Close()
+	}
+
+	return serverStatuses, nil
+}
+
 // Login tries to log in the user in multiples LDAP
 func (multiples *MultiLDAP) Login(query *models.LoginUserQuery) (
 	*models.ExternalUserInfo, error,

pkg/services/multildap/multildap_test.go

@@ -11,6 +11,56 @@ import (
 
 func TestMultiLDAP(t *testing.T) {
 	Convey("Multildap", t, func() {
+		Convey("Ping()", func() {
+			Convey("Should return error for absent config list", func() {
+				setup()
+
+				multi := New([]*ldap.ServerConfig{})
+				_, err := multi.Ping()
+
+				So(err, ShouldBeError)
+				So(err, ShouldEqual, ErrNoLDAPServers)
+
+				teardown()
+			})
+			Convey("Should return an unavailable status on dial error", func() {
+				mock := setup()
+
+				expectedErr := errors.New("Dial error")
+				mock.dialErrReturn = expectedErr
+
+				multi := New([]*ldap.ServerConfig{
+					{Host: "10.0.0.1", Port: 361},
+				})
+
+				statuses, err := multi.Ping()
+
+				So(err, ShouldBeNil)
+				So(statuses[0].Host, ShouldEqual, "10.0.0.1")
+				So(statuses[0].Port, ShouldEqual, 361)
+				So(statuses[0].Available, ShouldBeFalse)
+				So(statuses[0].Error, ShouldEqual, expectedErr)
+
+				teardown()
+			})
+			Convey("Shoudl get the LDAP server statuses", func() {
+				setup()
+
+				multi := New([]*ldap.ServerConfig{
+					{Host: "10.0.0.1", Port: 361},
+				})
+
+				statuses, err := multi.Ping()
+
+				So(err, ShouldBeNil)
+				So(statuses[0].Host, ShouldEqual, "10.0.0.1")
+				So(statuses[0].Port, ShouldEqual, 361)
+				So(statuses[0].Available, ShouldBeTrue)
+				So(statuses[0].Error, ShouldBeNil)
+
+				teardown()
+			})
+		})
 		Convey("Login()", func() {
 			Convey("Should return error for absent config list", func() {
 				setup()

pkg/services/multildap/testing.go

@@ -69,10 +69,17 @@ type MockMultiLDAP struct {
 	LoginCalledTimes int
 	UsersCalledTimes int
 	UserCalledTimes  int
+	PingCalledTimes  int
 
 	UsersResult []*models.ExternalUserInfo
 }
 
+func (mock *MockMultiLDAP) Ping() ([]*ServerStatus, error) {
+	mock.PingCalledTimes = mock.PingCalledTimes + 1
+
+	return nil, nil
+}
+
 // Login test fn
 func (mock *MockMultiLDAP) Login(query *models.LoginUserQuery) (
 	*models.ExternalUserInfo, error,