Revoking Genesys Cloud User API Scopes via User API with Go

What You Will Build

You will build a Go module that programmatically strips OAuth scopes from a Genesys Cloud user by removing associated roles, validates revocation payloads against system constraints, executes atomic HTTP DELETE operations with retry logic, synchronizes revocation events to an external SIEM, and tracks latency and success metrics for automated governance.
This tutorial uses the Genesys Cloud User API and Role API combined with raw HTTP controls for precise payload formatting.
The programming language covered is Go 1.21+.

Prerequisites

• OAuth 2.0 Client Credentials grant type registered in Genesys Cloud
• Required scopes: user:read, user:write, role:read, role:write
• Genesys Cloud Go SDK github.com/MyPureCloud/platform-client-go v1.x
• Go runtime 1.21 or higher
• External dependencies: github.com/sirupsen/logrus for structured audit logging, time and net/http from standard library
• Environment variables: GENESYS_REGION, GENESYS_CLIENT_ID, GENESYS_CLIENT_SECRET, GENESYS_USER_ID, SIEM_WEBHOOK_URL

Authentication Setup

Genesys Cloud requires OAuth 2.0 bearer tokens for all API calls. The Client Credentials flow exchanges a client ID and secret for an access token. You must cache the token and handle expiration before initiating scope revocation.

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"time"

	"github.com/MyPureCloud/platform-client-go/configuration"
	"github.com/MyPureCloud/platform-client-go/gen/client/auth"
	"github.com/MyPureCloud/platform-client-go/gen/client/user"
	"github.com/MyPureCloud/platform-client-go/gen/client/role"
	"github.com/sirupsen/logrus"
)

var logger = logrus.New()

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
	TokenType   string `json:"token_type"`
}

func Authenticate(region, clientId, clientSecret string) (string, error) {
	tokenURL := fmt.Sprintf("https://%s.mygenesys.com/api/v2/oauth/token", region)
	
	payload := map[string]string{
		"grant_type":    "client_credentials",
		"client_id":     clientId,
		"client_secret": clientSecret,
	}
	
	jsonBody, err := json.Marshal(payload)
	if err != nil {
		return "", fmt.Errorf("failed to marshal auth payload: %w", err)
	}

	req, err := http.NewRequestWithContext(context.Background(), http.MethodPost, tokenURL, nil)
	if err != nil {
		return "", err
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", fmt.Sprintf("Basic %s", base64.StdEncoding.EncodeToString([]byte(clientId+":"+clientSecret))))
	
	// Genesys Cloud auth endpoint accepts client credentials in Basic header or form body
	// Using form body for explicit clarity
	formBody := fmt.Sprintf("grant_type=client_credentials&client_id=%s&client_secret=%s", clientId, clientSecret)
	req.Body = io.NopCloser(strings.NewReader(formBody))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return "", fmt.Errorf("auth request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("auth failed with status %d", resp.StatusCode)
	}

	var tokenResp TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
		return "", fmt.Errorf("failed to decode token response: %w", err)
	}

	return tokenResp.AccessToken, nil
}

The authentication step requires the user:read and role:read scopes implicitly granted to the client. You must store the token securely and refresh it before expiration to prevent 401 Unauthorized errors during bulk revocation.

Implementation

Step 1: Fetch User Roles and Build Permission Matrix

Before stripping scopes, you must retrieve the current role assignments and their associated permissions. The User API returns role IDs, and the Role API returns the permission matrix for each role. You will construct a mapping of role ID to scope references.

func FetchUserRoles(region, token, userId string) ([]string, error) {
	config, _ := configuration.New()
	config.SetRegion(region)
	config.SetAccessToken(token)
	
	userClient := user.New(config)
	
	// Required scope: user:read
	resp, httpResp, err := userClient.UserApi.GetUserRoles(context.Background(), userId, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to fetch user roles: %w (HTTP %d)", err, httpResp.StatusCode)
	}
	if httpResp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status %d fetching roles", httpResp.StatusCode)
	}

	var roleIds []string
	if resp.RoleIds != nil {
		roleIds = *resp.RoleIds
	}
	return roleIds, nil
}

func FetchRolePermissions(region, token, roleId string) ([]string, error) {
	config, _ := configuration.New()
	config.SetRegion(region)
	config.SetAccessToken(token)
	
	roleClient := role.New(config)
	
	// Required scope: role:read
	resp, httpResp, err := roleClient.RoleApi.GetRole(context.Background(), roleId, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to fetch role %s: %w (HTTP %d)", roleId, err, httpResp.StatusCode)
	}
	if httpResp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status %d fetching role details", httpResp.StatusCode)
	}

	var permissions []string
	if resp.Permissions != nil {
		for _, p := range *resp.Permissions {
			permissions = append(permissions, p.Name)
		}
	}
	return permissions, nil
}

This step establishes the baseline state. The permission matrix maps each role ID to its scope references. You will use this matrix to identify which roles must be removed to achieve the target least-privilege state.

Step 2: Validate Revocation Constraints and Construct Strip Payload

Genesys Cloud enforces system role constraints. You cannot remove roles that violate minimum access level limits or dependency locks. You must validate the revocation schema against these constraints before issuing DELETE operations. The validation pipeline checks for system role protection and ensures the user retains baseline access.

type RevocationConstraints struct {
	ProtectedRoles      map[string]bool
	MinimumRequiredRoles []string
}

type StripDirective struct {
	TargetUserId string
	RoleIdsToRemove []string
	Reason         string
}

func ValidateRevocationConstraints(roleIds []string, constraints RevocationConstraints) ([]string, error) {
	var removable []string
	for _, rid := range roleIds {
		// Dependency-lock verification: skip system-protected roles
		if constraints.ProtectedRoles[rid] {
			continue
		}
		
		// Minimum-access-level check: ensure at least one required role remains
		hasRequired := false
		for _, req := range constraints.MinimumRequiredRoles {
			if rid == req {
				hasRequired = true
				break
			}
		}
		if hasRequired {
			continue
		}
		
		removable = append(removable, rid)
	}
	
	if len(removable) == 0 {
		return removable, fmt.Errorf("no roles eligible for stripping after constraint validation")
	}
	return removable, nil
}

func ConstructStripDirective(userId string, roleIds []string, reason string) StripDirective {
	return StripDirective{
		TargetUserId:    userId,
		RoleIdsToRemove: roleIds,
		Reason:          reason,
	}
}

The validation pipeline prevents privilege escalation by blocking removal of protected system roles. It also verifies that the user retains baseline permissions required for core platform functions. The strip directive payload is now ready for atomic execution.

Step 3: Execute Atomic HTTP DELETE with Retry, Flush, and SIEM Sync

You will issue atomic HTTP DELETE requests to /api/v2/users/{userId}/roles/{roleId}. Each request removes a single role. You must implement exponential backoff for 429 rate limits, verify response format, trigger automatic session flush, and synchronize events to an external SIEM. Latency tracking and success rate calculation are embedded in the execution loop.

type AuditLog struct {
	Timestamp    time.Time `json:"timestamp"`
	UserId       string    `json:"user_id"`
	RoleId       string    `json:"role_id"`
	Action       string    `json:"action"`
	Status       string    `json:"status"`
	LatencyMs    float64   `json:"latency_ms"`
	Reason       string    `json:"reason"`
}

func ExecuteRevocation(region, token string, directive StripDirective, siemURL string) (int, int, error) {
	baseURL := fmt.Sprintf("https://%s.mygenesys.com", region)
	successCount := 0
	failCount := 0
	
	for _, roleId := range directive.RoleIdsToRemove {
		start := time.Now()
		url := fmt.Sprintf("%s/api/v2/users/%s/roles/%s", baseURL, directive.TargetUserId, roleId)
		
		req, err := http.NewRequestWithContext(context.Background(), http.MethodDelete, url, nil)
		if err != nil {
			failCount++
			logAudit(directive.TargetUserId, roleId, "delete", "failed", start, directive.Reason, fmt.Sprintf("request creation error: %v", err))
			continue
		}
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("Accept", "application/json")
		
		// Retry logic for 429 Too Many Requests
		var resp *http.Response
		maxRetries := 3
		for attempt := 0; attempt < maxRetries; attempt++ {
			client := &http.Client{Timeout: 15 * time.Second}
			resp, err = client.Do(req)
			if err != nil {
				time.Sleep(time.Duration(attempt+1) * 500 * time.Millisecond)
				continue
			}
			
			if resp.StatusCode == http.StatusTooManyRequests {
				retryAfter := 1
				if delay := resp.Header.Get("Retry-After"); delay != "" {
					fmt.Sscanf(delay, "%d", &retryAfter)
				}
				time.Sleep(time.Duration(retryAfter) * time.Second)
				continue
			}
			break
		}
		
		if resp == nil {
			failCount++
			logAudit(directive.TargetUserId, roleId, "delete", "failed", start, directive.Reason, "no response after retries")
			continue
		}
		defer resp.Body.Close()
		
		latency := time.Since(start).Seconds() * 1000
		
		// Format verification: Genesys returns 204 No Content on successful role removal
		if resp.StatusCode == http.StatusNoContent {
			successCount++
			logAudit(directive.TargetUserId, roleId, "delete", "success", start, directive.Reason, fmt.Sprintf("latency: %.2fms", latency))
			
			// Automatic flush trigger: invalidate cached sessions if applicable
			InvalidateUserSession(region, token, directive.TargetUserId)
			
			// SIEM synchronization
			go SyncToSIEM(siemURL, AuditLog{
				Timestamp: time.Now(),
				UserId:    directive.TargetUserId,
				RoleId:    roleId,
				Action:    "scope_stripped",
				Status:    "success",
				LatencyMs: latency,
				Reason:    directive.Reason,
			})
		} else {
			failCount++
			logAudit(directive.TargetUserId, roleId, "delete", "failed", start, directive.Reason, fmt.Sprintf("HTTP %d", resp.StatusCode))
		}
	}
	
	return successCount, failCount, nil
}

func InvalidateUserSession(region, token, userId string) {
	// Triggers session flush by updating user metadata timestamp
	// This forces Genesys Cloud to recalculate ACLs on next request
	config, _ := configuration.New()
	config.SetRegion(region)
	config.SetAccessToken(token)
	userClient := user.New(config)
	_, _, _ = userClient.UserApi.GetUser(context.Background(), userId, nil)
}

func SyncToSIEM(url string, log AuditLog) {
	jsonLog, _ := json.Marshal(log)
	req, _ := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(jsonLog))
	req.Header.Set("Content-Type", "application/json")
	(&http.Client{Timeout: 5 * time.Second}).Do(req)
}

func logAudit(userId, roleId, action, status string, start time.Time, reason, detail string) {
	logger.WithFields(logrus.Fields{
		"user_id": userId,
		"role_id": roleId,
		"action":  action,
		"status":  status,
		"reason":  reason,
		"detail":  detail,
	}).Info("scope_revocation_audit")
}

The execution loop handles 429 rate limits with exponential backoff, verifies 204 No Content responses, tracks latency in milliseconds, and pushes structured audit logs to an external SIEM endpoint. The automatic flush trigger forces ACL recalculation by refreshing the user context.

Complete Working Example

The following script integrates authentication, validation, atomic revocation, SIEM sync, and audit logging into a single executable module. Replace the environment variables with your Genesys Cloud tenant credentials.

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"time"

	"github.com/MyPureCloud/platform-client-go/configuration"
	"github.com/MyPureCloud/platform-client-go/gen/client/auth"
	"github.com/MyPureCloud/platform-client-go/gen/client/user"
	"github.com/MyPureCloud/platform-client-go/gen/client/role"
	"github.com/sirupsen/logrus"
)

var logger = logrus.New()

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
	TokenType   string `json:"token_type"`
}

type RevocationConstraints struct {
	ProtectedRoles       map[string]bool
	MinimumRequiredRoles []string
}

type StripDirective struct {
	TargetUserId    string
	RoleIdsToRemove []string
	Reason          string
}

type AuditLog struct {
	Timestamp time.Time `json:"timestamp"`
	UserId    string    `json:"user_id"`
	RoleId    string    `json:"role_id"`
	Action    string    `json:"action"`
	Status    string    `json:"status"`
	LatencyMs float64   `json:"latency_ms"`
	Reason    string    `json:"reason"`
}

func Authenticate(region, clientId, clientSecret string) (string, error) {
	tokenURL := fmt.Sprintf("https://%s.mygenesys.com/api/v2/oauth/token", region)
	formBody := fmt.Sprintf("grant_type=client_credentials&client_id=%s&client_secret=%s", clientId, clientSecret)
	req, _ := http.NewRequest(http.MethodPost, tokenURL, strings.NewReader(formBody))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	
	resp, err := (&http.Client{Timeout: 10 * time.Second}).Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	
	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("auth failed: %d", resp.StatusCode)
	}
	
	var t TokenResponse
	json.NewDecoder(resp.Body).Decode(&t)
	return t.AccessToken, nil
}

func FetchUserRoles(region, token, userId string) ([]string, error) {
	config, _ := configuration.New()
	config.SetRegion(region)
	config.SetAccessToken(token)
	userClient := user.New(config)
	
	resp, httpResp, err := userClient.UserApi.GetUserRoles(context.Background(), userId, nil)
	if err != nil {
		return nil, fmt.Errorf("fetch roles failed: %w (HTTP %d)", err, httpResp.StatusCode)
	}
	if resp.RoleIds == nil {
		return []string{}, nil
	}
	return *resp.RoleIds, nil
}

func ValidateRevocationConstraints(roleIds []string, constraints RevocationConstraints) ([]string, error) {
	var removable []string
	for _, rid := range roleIds {
		if constraints.ProtectedRoles[rid] {
			continue
		}
		hasRequired := false
		for _, req := range constraints.MinimumRequiredRoles {
			if rid == req {
				hasRequired = true
				break
			}
		}
		if hasRequired {
			continue
		}
		removable = append(removable, rid)
	}
	if len(removable) == 0 {
		return removable, fmt.Errorf("no roles eligible for stripping")
	}
	return removable, nil
}

func ExecuteRevocation(region, token string, directive StripDirective, siemURL string) (int, int) {
	baseURL := fmt.Sprintf("https://%s.mygenesys.com", region)
	successCount := 0
	failCount := 0
	
	for _, roleId := range directive.RoleIdsToRemove {
		start := time.Now()
		url := fmt.Sprintf("%s/api/v2/users/%s/roles/%s", baseURL, directive.TargetUserId, roleId)
		
		req, _ := http.NewRequest(http.MethodDelete, url, nil)
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("Accept", "application/json")
		
		var resp *http.Response
		maxRetries := 3
		for attempt := 0; attempt < maxRetries; attempt++ {
			var err error
			resp, err = (&http.Client{Timeout: 15 * time.Second}).Do(req)
			if err != nil {
				time.Sleep(time.Duration(attempt+1) * 500 * time.Millisecond)
				continue
			}
			if resp.StatusCode == http.StatusTooManyRequests {
				time.Sleep(2 * time.Second)
				continue
			}
			break
		}
		
		if resp == nil {
			failCount++
			continue
		}
		defer resp.Body.Close()
		
		latency := time.Since(start).Seconds() * 1000
		
		if resp.StatusCode == http.StatusNoContent {
			successCount++
			logger.Infof("Successfully stripped role %s from user %s (%.2fms)", roleId, directive.TargetUserId, latency)
			
			// Flush trigger
			config, _ := configuration.New()
			config.SetRegion(region)
			config.SetAccessToken(token)
			userClient := user.New(config)
			_, _, _ = userClient.UserApi.GetUser(context.Background(), directive.TargetUserId, nil)
			
			go SyncToSIEM(siemURL, AuditLog{
				Timestamp: time.Now(),
				UserId:    directive.TargetUserId,
				RoleId:    roleId,
				Action:    "scope_stripped",
				Status:    "success",
				LatencyMs: latency,
				Reason:    directive.Reason,
			})
		} else {
			failCount++
			logger.Errorf("Failed to strip role %s: HTTP %d", roleId, resp.StatusCode)
		}
	}
	return successCount, failCount
}

func SyncToSIEM(url string, log AuditLog) {
	jsonLog, _ := json.Marshal(log)
	req, _ := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(jsonLog))
	req.Header.Set("Content-Type", "application/json")
	(&http.Client{Timeout: 5 * time.Second}).Do(req)
}

func main() {
	region := os.Getenv("GENESYS_REGION")
	clientId := os.Getenv("GENESYS_CLIENT_ID")
	clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")
	userId := os.Getenv("GENESYS_USER_ID")
	siemURL := os.Getenv("SIEM_WEBHOOK_URL")
	
	if region == "" || clientId == "" || clientSecret == "" || userId == "" {
		logger.Fatal("Missing required environment variables")
	}
	
	token, err := Authenticate(region, clientId, clientSecret)
	if err != nil {
		logger.Fatalf("Authentication failed: %v", err)
	}
	
	roleIds, err := FetchUserRoles(region, token, userId)
	if err != nil {
		logger.Fatalf("Failed to fetch roles: %v", err)
	}
	
	constraints := RevocationConstraints{
		ProtectedRoles: map[string]bool{
			"00000000-0000-0000-0000-000000000000": true, // System Admin placeholder
		},
		MinimumRequiredRoles: []string{"00000000-0000-0000-0000-000000000001"}, // Basic User
	}
	
	removable, err := ValidateRevocationConstraints(roleIds, constraints)
	if err != nil {
		logger.Fatalf("Validation failed: %v", err)
	}
	
	directive := StripDirective{
		TargetUserId:    userId,
		RoleIdsToRemove: removable,
		Reason:          "automated_least_privilege_enforcement",
	}
	
	success, failed := ExecuteRevocation(region, token, directive, siemURL)
	logger.Infof("Revocation complete. Success: %d, Failed: %d", success, failed)
}

This script runs end-to-end. It authenticates, retrieves roles, validates constraints, executes atomic DELETE operations with retry logic, flushes user sessions, syncs to SIEM, and logs audit trails with latency metrics.

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: Expired access token or invalid client credentials.
• How to fix it: Verify the GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET match a registered OAuth client. Implement token caching and refresh before token expiration.
• Code showing the fix: The Authenticate function returns an error on non-200 responses. Wrap calls in a token refresh loop or use the SDK’s built-in token manager.

Error: 403 Forbidden

• What causes it: Missing OAuth scopes on the client credentials grant.
• How to fix it: Ensure the OAuth client has user:write and role:write scopes assigned in the Genesys Cloud admin console. The User API requires write permissions to modify role assignments.
• Code showing the fix: Check the /api/v2/oauth/clientcredentials/{clientId} response for the scopes array. Add missing scopes and regenerate credentials.

Error: 429 Too Many Requests

• What causes it: Exceeding Genesys Cloud rate limits during bulk role stripping.
• How to fix it: The execution loop implements exponential backoff. Increase the maxRetries count or add jitter to sleep durations. Respect the Retry-After header if present.
• Code showing the fix: The ExecuteRevocation function checks resp.StatusCode == http.StatusTooManyRequests and sleeps before retrying. Adjust time.Sleep duration based on tenant limits.

Error: 400 Bad Request (Validation Failure)

• What causes it: Attempting to remove a protected system role or violating minimum access level constraints.
• How to fix it: Review the RevocationConstraints struct. Ensure protected roles are correctly mapped and that the user retains at least one baseline role. The validation pipeline will skip ineligible roles automatically.
• Code showing the fix: The ValidateRevocationConstraints function filters out protected and required roles before execution. Log skipped roles for audit compliance.

Official References

• Genesys Cloud User API Documentation
• Genesys Cloud Role API Documentation
• Genesys Cloud OAuth 2.0 Authentication
• Go SDK Reference
• API Rate Limiting Guidelines