Handle user delete (#1113)

Implement user deletion across all IDP-ss. Expires all user peers
when the user is deleted. Users are permanently removed from a local
store, but in IDP, we remove Netbird attributes for the user
untilUserDeleteFromIDPEnabled setting is not enabled.

To test, an admin user should remove any additional users.

Until the UI incorporates this feature, use a curl DELETE request
targeting the /users/<USER_ID> management endpoint. Note that this
request only removes user attributes and doesn't trigger a delete
from the IDP.

To enable user removal from the IdP, set UserDeleteFromIDPEnabled
to true in account settings. Until we have a UI for this, make this
change directly in the store file.

Store the deleted email addresses in encrypted in activity store.

management/server/idp/auth0.go

@@ -513,7 +513,9 @@ func buildUserExportRequest() (string, error) {
 	return string(str), nil
 }
 
-func (am *Auth0Manager) createPostRequest(endpoint string, payloadStr string) (*http.Request, error) {
+func (am *Auth0Manager) createRequest(
+	method string, endpoint string, body io.Reader,
+) (*http.Request, error) {
 	jwtToken, err := am.credentials.Authenticate()
 	if err != nil {
 		return nil, err
@@ -521,17 +523,23 @@ func (am *Auth0Manager) createPostRequest(endpoint string, payloadStr string) (*
 
 	reqURL := am.authIssuer + endpoint
 
-	payload := strings.NewReader(payloadStr)
-
-	req, err := http.NewRequest("POST", reqURL, payload)
+	req, err := http.NewRequest(method, reqURL, body)
 	if err != nil {
 		return nil, err
 	}
 	req.Header.Add("authorization", "Bearer "+jwtToken.AccessToken)
+
+	return req, nil
+}
+
+func (am *Auth0Manager) createPostRequest(endpoint string, payloadStr string) (*http.Request, error) {
+	req, err := am.createRequest("POST", endpoint, strings.NewReader(payloadStr))
+	if err != nil {
+		return nil, err
+	}
 	req.Header.Add("content-type", "application/json")
 
 	return req, nil
-
 }
 
 // GetAllAccounts gets all registered accounts with corresponding user data.
@@ -737,6 +745,38 @@ func (am *Auth0Manager) InviteUserByID(userID string) error {
 	return nil
 }
 
+// DeleteUser from Auth0
+func (am *Auth0Manager) DeleteUser(userID string) error {
+	req, err := am.createRequest(http.MethodDelete, "/api/v2/users/"+url.QueryEscape(userID), nil)
+	if err != nil {
+		return err
+	}
+
+	resp, err := am.httpClient.Do(req)
+	if err != nil {
+		log.Debugf("execute delete request: %v", err)
+		if am.appMetrics != nil {
+			am.appMetrics.IDPMetrics().CountRequestError()
+		}
+		return err
+	}
+
+	defer func() {
+		err = resp.Body.Close()
+		if err != nil {
+			log.Errorf("close delete request body: %v", err)
+		}
+	}()
+	if resp.StatusCode != 204 {
+		if am.appMetrics != nil {
+			am.appMetrics.IDPMetrics().CountRequestStatusError()
+		}
+		return fmt.Errorf("unable to delete user, statusCode %d", resp.StatusCode)
+	}
+
+	return nil
+}
+
 // checkExportJobStatus checks the status of the job created at CreateExportUsersJob.
 // If the status is "completed", then return the downloadLink
 func (am *Auth0Manager) checkExportJobStatus(jobID string) (bool, string, error) {