Revoking Genesys Cloud Platform OAuth Credentials via Go Platform APIs

What You Will Build

• A production-ready Go module that programmatically revokes OAuth access and refresh tokens against the Genesys Cloud Platform API.
• The implementation targets the standard OAuth 2.0 revocation endpoint and Genesys Cloud token validation APIs to enforce security policies, track metrics, and dispatch audit events.
• The code is written in Go and handles payload construction, concurrency limits, structured audit logging, and SIEM webhook synchronization.

Prerequisites

• OAuth 2.0 client credentials with oauth:token:revoke, oauth:token:read, and user:session:view scopes.
• Genesys Cloud Platform API v2 environment URL (e.g., api.mypurecloud.com or api.euc1.pure.cloud).
• Go 1.21+ runtime.
• External dependencies: golang.org/x/sync/semaphore, github.com/google/uuid, time, context, net/http, encoding/json, fmt, log, net/url, sync.

Authentication Setup

Genesys Cloud supports the standard OAuth 2.0 token endpoint for client credentials grant. You must obtain a bearer token to call the token listing and validation APIs. The revocation endpoint itself accepts either a bearer token or HTTP Basic authentication encoded from the client ID and secret. The following code demonstrates the client credentials flow required to initialize the revoker.

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"time"
)

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

func ObtainAdminToken(ctx context.Context, envURL, clientID, clientSecret string) (string, error) {
	tokenURL := fmt.Sprintf("https://%s/api/v2/oauth/token", envURL)
	payload := url.Values{
		"grant_type":    {"client_credentials"},
		"client_id":     {clientID},
		"client_secret": {clientSecret},
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, tokenURL, bytes.NewBufferString(payload.Encode()))
	if err != nil {
		return "", fmt.Errorf("failed to create token request: %w", err)
	}
	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("token request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("token request returned status %d", resp.StatusCode)
	}

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

	return tokenResp.AccessToken, nil
}

Implementation

Step 1: Construct Revocation Payloads with Credential References and Scope Matrix

OAuth 2.0 RFC 7009 requires the revocation request to be formatted as application/x-www-form-urlencoded. Genesys Cloud expects a token parameter and an optional token_type_hint. To satisfy the requirement for credential references and scope matrices, we map internal tracking identifiers to the standard payload while preserving a structured audit record.

type RevocationPayload struct {
	Token          string
	TokenTypeHint  string
	ClientID       string
	ScopeMatrix    map[string]bool
	InvalidateNow  bool
	AuditReference string
}

func (rp RevocationPayload) EncodeForGenesys() url.Values {
	v := url.Values{}
	v.Set("token", rp.Token)
	if rp.TokenTypeHint != "" {
		v.Set("token_type_hint", rp.TokenTypeHint)
	}
	return v
}

func (rp RevocationPayload) ValidateSchema() error {
	if rp.Token == "" {
		return fmt.Errorf("token field is required for revocation")
	}
	if rp.TokenTypeHint != "access_token" && rp.TokenTypeHint != "refresh_token" {
		return fmt.Errorf("invalid token_type_hint: must be access_token or refresh_token")
	}
	return nil
}

Step 2: Validate Against Authentication Constraints and Active Session Counting

Before initiating revocation, verify the target client or user does not exceed maximum concurrent revocation limits. Genesys Cloud provides a token listing endpoint that returns active sessions. We enforce a security policy threshold to prevent cascading service disruptions.

type TokenListingResponse struct {
	TotalCount int      `json:"total_count"`
	Items      []TokenItem `json:"items"`
}

type TokenItem struct {
	ID          string `json:"id"`
	UserID      string `json:"user_id"`
	ClientID    string `json:"client_id"`
	TokenType   string `json:"token_type"`
	CreatedTime string `json:"created_time"`
}

func ValidateActiveSessions(ctx context.Context, envURL, adminToken, clientID string, maxConcurrent int) error {
	listURL := fmt.Sprintf("https://%s/api/v2/oauth/tokens?client_id=%s", envURL, url.PathEscape(clientID))
	
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, listURL, nil)
	if err != nil {
		return fmt.Errorf("failed to create session validation request: %w", err)
	}
	req.Header.Set("Authorization", "Bearer "+adminToken)

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

	if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
		return fmt.Errorf("authentication constraint violation: status %d", resp.StatusCode)
	}

	var listing TokenListingResponse
	if err := json.NewDecoder(resp.Body).Decode(&listing); err != nil {
		return fmt.Errorf("failed to decode session list: %w", err)
	}

	if listing.TotalCount > maxConcurrent {
		return fmt.Errorf("security policy violation: active sessions (%d) exceed maximum concurrent limit (%d)", listing.TotalCount, maxConcurrent)
	}
	return nil
}

Step 3: Execute Atomic POST Operations with Concurrency Limits and Cache Purge Logic

The core revocation loop uses a weighted semaphore to enforce maximum concurrent API calls. Each revocation request is atomic. Upon success, the local token cache purge logic triggers automatic session termination markers. We implement exponential backoff for HTTP 429 rate limit responses.

import (
	"golang.org/x/sync/semaphore"
	"math"
)

func ExecuteRevocation(ctx context.Context, envURL, adminToken string, payload RevocationPayload, sem *semaphore.Weighted) error {
	revokeURL := fmt.Sprintf("https://%s/api/v2/oauth/revoke", envURL)

	if err := payload.ValidateSchema(); err != nil {
		return fmt.Errorf("payload format verification failed: %w", err)
	}

	body := payload.EncodeForGenesys()

	for attempt := 0; attempt < 3; attempt++ {
		if err := sem.Acquire(ctx, 1); err != nil {
			return fmt.Errorf("semaphore acquire failed: %w", err)
		}

		req, err := http.NewRequestWithContext(ctx, http.MethodPost, revokeURL, bytes.NewBufferString(body.Encode()))
		if err != nil {
			sem.Release(1)
			return fmt.Errorf("failed to create revocation request: %w", err)
		}
		req.Header.Set("Authorization", "Bearer "+adminToken)
		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

		client := &http.Client{Timeout: 15 * time.Second}
		resp, err := client.Do(req)
		if err != nil {
			sem.Release(1)
			return fmt.Errorf("revocation request failed: %w", err)
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			sem.Release(1)
			backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			select {
			case <-ctx.Done():
				return ctx.Err()
			case <-time.After(backoff):
				continue
			}
		}

		resp.Body.Close()
		sem.Release(1)

		if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusNoContent {
			return nil
		}
		return fmt.Errorf("revocation failed with status %d", resp.StatusCode)
	}
	return fmt.Errorf("revocation failed after 3 attempts")
}

Step 4: Synchronize Events with SIEM Webhooks, Track Latency, and Generate Audit Logs

Every revocation attempt produces a structured audit record. We track latency and success rates, then dispatch the event to an external SIEM webhook. The audit log includes the credential reference, scope matrix snapshot, and invalidation directive state.

type AuditRecord struct {
	Timestamp        string `json:"timestamp"`
	AuditReference   string `json:"audit_reference"`
	ClientID         string `json:"client_id"`
	TokenTypeHint    string `json:"token_type_hint"`
	ScopeMatrix      map[string]bool `json:"scope_matrix"`
	InvalidateNow    bool          `json:"invalidate_now"`
	LatencyMs        float64       `json:"latency_ms"`
	Success          bool          `json:"success"`
	Error            string        `json:"error,omitempty"`
}

type Metrics struct {
	mu           sync.Mutex
	Total        int
	SuccessCount int
}

func (m *Metrics) Record(success bool, latencyMs float64) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.Total++
	if success {
		m.SuccessCount++
	}
}

func DispatchSIEMWebhook(ctx context.Context, webhookURL string, record AuditRecord) error {
	jsonData, err := json.Marshal(record)
	if err != nil {
		return fmt.Errorf("failed to marshal audit record: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewBuffer(jsonData))
	if err != nil {
		return fmt.Errorf("failed to create webhook request: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook dispatch failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode >= http.StatusBadRequest {
		return fmt.Errorf("webhook returned status %d", resp.StatusCode)
	}
	return nil
}

Complete Working Example

The following module integrates all components into a single executable credential revoker. It initializes authentication, enforces concurrency limits, validates session counts, executes revocations, tracks metrics, and dispatches audit events.

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"log"
	"math"
	"net/http"
	"net/url"
	"sync"
	"time"

	"github.com/google/uuid"
	"golang.org/x/sync/semaphore"
)

// Structures defined in steps 1-4 are included here for completeness.
// OAuthTokenResponse, RevocationPayload, TokenListingResponse, TokenItem, AuditRecord, Metrics

func main() {
	ctx := context.Background()
	envURL := "api.mypurecloud.com"
	clientID := "YOUR_CLIENT_ID"
	clientSecret := "YOUR_CLIENT_SECRET"
	webhookURL := "https://siem.yourcompany.com/api/v1/genesys/credential-revoked"
	maxConcurrent := 5
	maxActiveSessions := 100

	// 1. Authentication Setup
	adminToken, err := ObtainAdminToken(ctx, envURL, clientID, clientSecret)
	if err != nil {
		log.Fatalf("Authentication failed: %v", err)
	}

	// 2. Initialize Revoker Components
	sem := semaphore.NewWeighted(int64(maxConcurrent))
	metrics := &Metrics{}
	var wg sync.WaitGroup

	// 3. Define Target Tokens (Replace with dynamic source in production)
	targetTokens := []string{
		"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
		"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
	}

	for _, token := range targetTokens {
		wg.Add(1)
		go func(tok string) {
			defer wg.Done()

			auditRef := uuid.New().String()
			start := time.Now()

			payload := RevocationPayload{
				Token:          tok,
				TokenTypeHint:  "access_token",
				ClientID:       clientID,
				ScopeMatrix:    map[string]bool{"oauth:token:revoke": true, "user:session:view": true},
				InvalidateNow:  true,
				AuditReference: auditRef,
			}

			// Session validation before revocation
			if err := ValidateActiveSessions(ctx, envURL, adminToken, clientID, maxActiveSessions); err != nil {
				recordAudit(auditRef, clientID, payload, start, false, err.Error())
				log.Printf("Validation failed for %s: %v", auditRef, err)
				return
			}

			// Execute atomic revocation
			err := ExecuteRevocation(ctx, envURL, adminToken, payload, sem)
			success := err == nil
			latency := time.Since(start).Milliseconds()
			metrics.Record(success, float64(latency))

			// Cache purge trigger (simulated local state invalidation)
			if success {
				log.Printf("Token cache purged for reference %s", auditRef)
			}

			recordAudit(auditRef, clientID, payload, start, success, err)
		}(token)
	}

	wg.Wait()

	// Final metrics output
	metrics.mu.Lock()
	successRate := 0.0
	if metrics.Total > 0 {
		successRate = float64(metrics.SuccessCount) / float64(metrics.Total) * 100
	}
	fmt.Printf("Revocation complete. Total: %d, Success Rate: %.2f%%\n", metrics.Total, successRate)
}

func recordAudit(ref, clientID string, payload RevocationPayload, start time.Time, success bool, errMsg string) {
	latency := time.Since(start).Milliseconds()
	record := AuditRecord{
		Timestamp:        time.Now().UTC().Format(time.RFC3339),
		AuditReference:   ref,
		ClientID:         clientID,
		TokenTypeHint:    payload.TokenTypeHint,
		ScopeMatrix:      payload.ScopeMatrix,
		InvalidateNow:    payload.InvalidateNow,
		LatencyMs:        float64(latency),
		Success:          success,
		Error:            errMsg,
	}

	// Write to local audit log
	log.Printf("AUDIT: %s", toJSON(record))

	// Dispatch to SIEM
	go func() {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := DispatchSIEMWebhook(ctx, "https://siem.yourcompany.com/api/v1/genesys/credential-revoked", record); err != nil {
			log.Printf("SIEM webhook dispatch failed: %v", err)
		}
	}()
}

func toJSON(v any) string {
	b, _ := json.Marshal(v)
	return string(b)
}

Common Errors & Debugging

Error: HTTP 401 Unauthorized on Revocation Endpoint

• Cause: The bearer token lacks the oauth:token:revoke scope, or the client credentials used for the initial grant are expired.
• Fix: Verify the OAuth client scope configuration in the Genesys Cloud admin console. Rotate the client secret if it has been compromised. Ensure the Authorization header uses the format Bearer <token>.
• Code Fix: Update the token acquisition step to explicitly request the revocation scope in the scope parameter if using authorization code grant, or verify client credentials grant permissions.

Error: HTTP 403 Forbidden on Token Listing

• Cause: The admin token does not possess oauth:token:read or user:session:view permissions required to query /api/v2/oauth/tokens.
• Fix: Assign the required scopes to the OAuth client. Re-authenticate to obtain a token with the expanded scope matrix.
• Code Fix: Add scope validation during authentication setup:

if !containsScope(tokenResp.Scope, "oauth:token:read") {
    return "", fmt.Errorf("missing required scope: oauth:token:read")
}

Error: HTTP 400 Bad Request on Revocation Payload

• Cause: The token_type_hint contains an invalid value, or the token field is malformed. Genesys Cloud strictly enforces OAuth 2.0 RFC 7009 formatting.
• Fix: Ensure token_type_hint is exactly access_token or refresh_token. Validate that the token string matches the expected JWT or opaque token format returned by Genesys Cloud.
• Code Fix: The ValidateSchema() method in Step 1 enforces this. Review the error message returned by the decoder to identify malformed characters.

Error: HTTP 429 Too Many Requests

• Cause: The revocation loop exceeds Genesys Cloud platform rate limits. Concurrent API calls from multiple goroutines trigger throttling.
• Fix: Reduce the semaphore weight or increase the exponential backoff multiplier. The provided implementation caps concurrency at maxConcurrent and retries with backoff.
• Code Fix: Adjust semaphore.NewWeighted(5) to a lower value if operating in a high-throughput environment. Monitor the Retry-After header if Genesys Cloud returns it.

Official References

• Genesys Cloud OAuth 2.0 Revocation Endpoint Documentation
• Genesys Cloud Token Management API Reference
• RFC 7009: OAuth 2.0 Token Revocation
• Go net/http Standard Library Documentation
• golang.org/x/sync Semaphore Package