dataprovider: add support for user status and expiration

an user can now be disabled or expired.

If you are using an SQL database as dataprovider please remember to
execute the sql update script inside "sql" folder.

Fixes #57

sftpd/sftpd_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/drakkan/sftpgo/httpd"
 	"github.com/drakkan/sftpgo/logger"
 	"github.com/drakkan/sftpgo/sftpd"
+	"github.com/drakkan/sftpgo/utils"
 	"github.com/pkg/sftp"
 	"github.com/rs/zerolog"
 )
@@ -687,6 +688,13 @@ func TestLogin(t *testing.T) {
 		if err != nil {
 			t.Errorf("sftp client with valid password must work")
 		}
+		user, _, err = httpd.GetUserByID(user.ID, http.StatusOK)
+		if err != nil {
+			t.Errorf("error getting user: %v", err)
+		}
+		if user.LastLogin <= 0 {
+			t.Errorf("last login must be updated after a successful login: %v", user.LastLogin)
+		}
 	}
 	client, err = getSftpClient(user, true)
 	if err != nil {
@@ -740,6 +748,97 @@ func TestLogin(t *testing.T) {
 	os.RemoveAll(user.GetHomeDir())
 }
 
+func TestLoginUserStatus(t *testing.T) {
+	usePubKey := true
+	user, _, err := httpd.AddUser(getTestUser(usePubKey), http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to add user: %v", err)
+	}
+	client, err := getSftpClient(user, usePubKey)
+	if err != nil {
+		t.Errorf("unable to create sftp client: %v", err)
+	} else {
+		defer client.Close()
+		_, err := client.Getwd()
+		if err != nil {
+			t.Errorf("sftp client with valid credentials must work")
+		}
+		user, _, err = httpd.GetUserByID(user.ID, http.StatusOK)
+		if err != nil {
+			t.Errorf("error getting user: %v", err)
+		}
+		if user.LastLogin <= 0 {
+			t.Errorf("last login must be updated after a successful login: %v", user.LastLogin)
+		}
+	}
+	user.Status = 0
+	user, _, err = httpd.UpdateUser(user, http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to update user: %v", err)
+	}
+	client, err = getSftpClient(user, usePubKey)
+	if err == nil {
+		t.Errorf("login for a disabled user must fail")
+		defer client.Close()
+	}
+	_, err = httpd.RemoveUser(user, http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to remove user: %v", err)
+	}
+	os.RemoveAll(user.GetHomeDir())
+}
+
+func TestLoginUserExpiration(t *testing.T) {
+	usePubKey := true
+	user, _, err := httpd.AddUser(getTestUser(usePubKey), http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to add user: %v", err)
+	}
+	client, err := getSftpClient(user, usePubKey)
+	if err != nil {
+		t.Errorf("unable to create sftp client: %v", err)
+	} else {
+		defer client.Close()
+		_, err := client.Getwd()
+		if err != nil {
+			t.Errorf("sftp client with valid credentials must work")
+		}
+		user, _, err = httpd.GetUserByID(user.ID, http.StatusOK)
+		if err != nil {
+			t.Errorf("error getting user: %v", err)
+		}
+		if user.LastLogin <= 0 {
+			t.Errorf("last login must be updated after a successful login: %v", user.LastLogin)
+		}
+	}
+	user.ExpirationDate = utils.GetTimeAsMsSinceEpoch(time.Now()) - 120000
+	user, _, err = httpd.UpdateUser(user, http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to update user: %v", err)
+	}
+	client, err = getSftpClient(user, usePubKey)
+	if err == nil {
+		t.Errorf("login for an expired user must fail")
+		defer client.Close()
+	}
+	user.ExpirationDate = utils.GetTimeAsMsSinceEpoch(time.Now()) + 120000
+	_, _, err = httpd.UpdateUser(user, http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to update user: %v", err)
+	}
+	client, err = getSftpClient(user, usePubKey)
+	if err != nil {
+		t.Errorf("login for a non expired user must succeed: %v", err)
+	} else {
+		defer client.Close()
+	}
+	_, err = httpd.RemoveUser(user, http.StatusOK)
+	if err != nil {
+		t.Errorf("unable to remove user: %v", err)
+	}
+	os.RemoveAll(user.GetHomeDir())
+}
+
 func TestLoginAfterUserUpdateEmptyPwd(t *testing.T) {
 	usePubKey := false
 	user, _, err := httpd.AddUser(getTestUser(usePubKey), http.StatusOK)
@@ -2330,10 +2429,12 @@ func waitTCPListening(address string) {
 
 func getTestUser(usePubKey bool) dataprovider.User {
 	user := dataprovider.User{
-		Username:    defaultUsername,
-		Password:    defaultPassword,
-		HomeDir:     filepath.Join(homeBasePath, defaultUsername),
-		Permissions: allPerms,
+		Username:       defaultUsername,
+		Password:       defaultPassword,
+		HomeDir:        filepath.Join(homeBasePath, defaultUsername),
+		Permissions:    allPerms,
+		Status:         1,
+		ExpirationDate: 0,
 	}
 	if usePubKey {
 		user.PublicKeys = []string{testPubKey}