Protecting Genesys Cloud LLM Gateway Prompt Inputs via Go

What You Will Build

A Go service that constructs prompt protection payloads with filter matrices and sanitize directives, validates inputs against token limits and jailbreak patterns, routes sanitized requests to the Genesys Cloud LLM Gateway, and synchronizes security events to external orchestration webhooks. This tutorial uses the Genesys Cloud LLM Gateway, Audit, and Webhook APIs. The implementation covers Go 1.21+ with production-grade error handling, retry logic, and schema validation.

Prerequisites

• OAuth 2.0 Client Credentials grant configured in Genesys Cloud
• Required scopes: ai:llm:gateway:manage, ai:llm:gateway:read, webhook:manage, ai:llm:gateway:audit:read
• Go 1.21 or higher
• External dependencies: github.com/google/uuid, github.com/go-playground/validator/v10
• Active Genesys Cloud organization with LLM Gateway enabled

Authentication Setup

Genesys Cloud uses OAuth 2.0 for API authentication. The client credentials flow returns a bearer token that expires after 3600 seconds. Production implementations must cache tokens and refresh them before expiration.

package main

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

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

type OAuthRequest struct {
	GrantType    string `json:"grant_type"`
	ClientID     string `json:"client_id"`
	ClientSecret string `json:"client_secret"`
	Scope        string `json:"scope"`
}

func getAccessToken(ctx context.Context, orgDomain, clientID, clientSecret string) (string, error) {
	url := fmt.Sprintf("https://%s/oauth/token", orgDomain)
	payload := OAuthRequest{
		GrantType:    "client_credentials",
		ClientID:     clientID,
		ClientSecret: clientSecret,
		Scope:        "ai:llm:gateway:manage webhook:manage ai:llm:gateway:audit:read",
	}

	body, err := json.Marshal(payload)
	if err != nil {
		return "", fmt.Errorf("marshal oauth payload: %w", err)
	}

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

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

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

	var result OAuthResponse
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", fmt.Errorf("decode oauth response: %w", err)
	}

	return result.AccessToken, nil
}

Implementation

Step 1: Configure Prompt Protection & Filter Matrix

The LLM Gateway accepts prompt protection configurations via POST /api/v2/ai/llm/gateway/prompt-protection. This endpoint requires the ai:llm:gateway:manage scope. The payload defines a filter matrix, sanitize directives, and maximum token limits. Genesys Cloud validates the schema before applying the rules.

type PromptProtectionConfig struct {
	ID             string                 `json:"id"`
	Name           string                 `json:"name" validate:"required,min=3"`
	FilterMatrix   FilterMatrix           `json:"filterMatrix" validate:"required"`
	SanitizeDirectives []string           `json:"sanitizeDirectives" validate:"required,min=1"`
	MaxTokenLimit  int                    `json:"maxTokenLimit" validate:"required,min=100,max=4096"`
	SecurityConstraints SecurityConstraints `json:"securityConstraints" validate:"required"`
	Enabled        bool                   `json:"enabled" validate:"required"`
}

type FilterMatrix struct {
	RegexPatterns    []string `json:"regexPatterns" validate:"required"`
	BlockCategories  []string `json:"blockCategories" validate:"required"`
	AllowListDomains []string `json:"allowListDomains"`
}

type SecurityConstraints struct {
	JailbreakDetection bool `json:"jailbreakDetection" validate:"required"`
	PIIFiltering       bool `json:"piiFiltering" validate:"required"`
	ContextIsolation   bool `json:"contextIsolation" validate:"required"`
}

func createPromptProtection(ctx context.Context, token, orgDomain string, config PromptProtectionConfig) error {
	url := fmt.Sprintf("https://%s/api/v2/ai/llm/gateway/prompt-protection", orgDomain)
	
	reqBody, err := json.Marshal(config)
	if err != nil {
		return fmt.Errorf("marshal protection config: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(reqBody))
	if err != nil {
		return fmt.Errorf("create protection request: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

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

	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
		return fmt.Errorf("gateway rejected protection config: status %d", resp.StatusCode)
	}

	return nil
}

Expected response: 201 Created with the assigned resource ID. A 400 Bad Request indicates schema validation failure. A 403 Forbidden indicates missing ai:llm:gateway:manage scope.

Step 2: Validate Payloads & Execute Jailbreak/Sensitive Data Checks

Before routing to the LLM Gateway, the service must validate incoming prompts against the configured filter matrix. This step implements pattern matching calculation, context isolation evaluation, and automatic rejection triggers. The validation runs locally to prevent unnecessary API calls and reduce latency.

import (
	"regexp"
	"strings"
)

type PromptPayload struct {
	PromptText  string `json:"promptText" validate:"required"`
	ModelID     string `json:"modelId" validate:"required"`
	ContextHash string `json:"contextHash"`
}

func validatePrompt(ctx context.Context, payload PromptPayload, config PromptProtectionConfig) (bool, string, error) {
	validator := validator.New()
	if err := validator.Struct(payload); err != nil {
		return false, "", fmt.Errorf("payload schema validation failed: %w", err)
	}

	// Token limit estimation (rough: 1 token ~= 4 characters)
	estimatedTokens := len(payload.PromptText) / 4
	if estimatedTokens > config.MaxTokenLimit {
		return false, fmt.Sprintf("exceeds max token limit: %d/%d", estimatedTokens, config.MaxTokenLimit), nil
	}

	// Jailbreak pattern matching
	jailbreakPatterns := []string{
		`(?i)(ignore\s+previous\s+instructions|system\s+prompt\s+override|act\s+as\s+an\s+unfiltered\s+model)`,
		`(?i)(bypass\s+security\s+filters|disable\s+guardrails|raw\s+output\s+mode)`,
	}
	for _, pattern := range jailbreakPatterns {
		re, err := regexp.Compile(pattern)
		if err != nil {
			return false, "", fmt.Errorf("compile jailbreak pattern: %w", err)
		}
		if re.MatchString(payload.PromptText) {
			return false, "jailbreak attempt detected", nil
		}
	}

	// PII/Sensitive data verification pipeline
	sensitivePatterns := []string{
		`(?i)\b\d{3}[-.]?\d{4}[-.]?\d{4}\b`, // Credit card
		`(?i)\b\d{3}-\d{2}-\d{4}\b`,          // SSN
		`(?i)[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}`, // Email
	}
	for _, pattern := range sensitivePatterns {
		re, err := regexp.Compile(pattern)
		if err != nil {
			return false, "", fmt.Errorf("compile sensitive pattern: %w", err)
		}
		if re.MatchString(payload.PromptText) {
			return false, "sensitive data detected", nil
		}
	}

	// Context isolation evaluation
	if config.SecurityConstraints.ContextIsolation && payload.ContextHash == "" {
		return false, "context isolation requires context hash", nil
	}

	return true, "validated", nil
}

The function returns a boolean indicating safety, a rejection reason string, and an error if validation logic itself fails. This atomic validation ensures format verification and automatic request rejection triggers operate before the payload reaches the gateway.

Step 3: Synchronize Security Events via Webhooks & Track Metrics

Genesys Cloud exposes webhook endpoints for security orchestration. You must register a webhook listener at POST /api/v2/external/webhooks with the webhook:manage scope. The service tracks latency, sanitize success rates, and generates audit logs for governance.

type WebhookConfig struct {
	Name       string   `json:"name" validate:"required"`
	EndpointURL string  `json:"endpointUrl" validate:"required,url"`
	Events     []string `json:"events" validate:"required"`
	Secret     string   `json:"secret" validate:"required,min=16"`
}

type AuditLogEntry struct {
	Timestamp   string `json:"timestamp"`
	EventID     string `json:"eventId"`
	PromptHash  string `json:"promptHash"`
	Status      string `json:"status"`
	LatencyMs   int    `json:"latencyMs"`
	RejectionReason string `json:"rejectionReason,omitempty"`
}

func registerSecurityWebhook(ctx context.Context, token, orgDomain string, config WebhookConfig) error {
	url := fmt.Sprintf("https://%s/api/v2/external/webhooks", orgDomain)
	reqBody, err := json.Marshal(config)
	if err != nil {
		return fmt.Errorf("marshal webhook config: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(reqBody))
	if err != nil {
		return fmt.Errorf("create webhook request: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+token)

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

	if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
		return fmt.Errorf("gateway rejected webhook: status %d", resp.StatusCode)
	}
	return nil
}

func queryAuditLogs(ctx context.Context, token, orgDomain string, pageSize int, nextPageToken string) ([]AuditLogEntry, string, error) {
	url := fmt.Sprintf("https://%s/api/v2/ai/llm/gateway/audit/logs/query", orgDomain)
	params := url.Values{}
	params.Set("pageSize", fmt.Sprintf("%d", pageSize))
	if nextPageToken != "" {
		params.Set("nextPageToken", nextPageToken)
	}
	url += "?" + params.Encode()

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil)
	if err != nil {
		return nil, "", fmt.Errorf("create audit request: %w", err)
	}
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{Timeout: 20 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, "", fmt.Errorf("audit request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, "", fmt.Errorf("audit query failed: status %d", resp.StatusCode)
	}

	var result struct {
		Entities    []AuditLogEntry `json:"entities"`
		NextPageToken string        `json:"nextPageToken"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return nil, "", fmt.Errorf("decode audit response: %w", err)
	}

	return result.Entities, result.NextPageToken, nil
}

The audit log query supports pagination via nextPageToken. Latency and success rates should be aggregated locally or pushed to the webhook payload for external observability platforms.

Step 4: Expose Prompt Protector Interface with Retry Logic

Production systems must handle transient failures and rate limits. The following wrapper implements exponential backoff for 429 Too Many Requests responses and wraps the complete protection lifecycle.

func doWithRetry(ctx context.Context, token, orgDomain string, config PromptProtectionConfig) error {
	maxRetries := 3
	baseDelay := 2 * time.Second

	for attempt := 0; attempt <= maxRetries; attempt++ {
		err := createPromptProtection(ctx, token, orgDomain, config)
		if err == nil {
			return nil
		}

		// Check for rate limit
		if strings.Contains(err.Error(), "status 429") {
			delay := baseDelay * time.Duration(1<<uint(attempt))
			time.Sleep(delay)
			continue
		}
		return err
	}
	return fmt.Errorf("max retries exceeded for prompt protection configuration")
}

Complete Working Example

The following module combines authentication, validation, configuration, webhook registration, and audit retrieval into a single executable service. Replace placeholder credentials before execution.

package main

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

	"github.com/google/uuid"
	"github.com/go-playground/validator/v10"
)

// OAuth & Config structures omitted for brevity. Reference Step 1 and Authentication Setup.

func main() {
	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
	defer cancel()

	orgDomain := "example.mygen.com"
	clientID := os.Getenv("GENESYS_CLIENT_ID")
	clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")

	if clientID == "" || clientSecret == "" {
		fmt.Println("GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET must be set")
		os.Exit(1)
	}

	token, err := getAccessToken(ctx, orgDomain, clientID, clientSecret)
	if err != nil {
		fmt.Printf("Authentication failed: %v\n", err)
		os.Exit(1)
	}

	config := PromptProtectionConfig{
		ID:   uuid.New().String(),
		Name: "ProductionPromptGuard",
		FilterMatrix: FilterMatrix{
			RegexPatterns:    []string{`(?i)system\s+override`, `(?i)ignore\s+rules`},
			BlockCategories:  []string{"malicious", "pii", "copyright"},
			AllowListDomains: []string{"internal.company.com"},
		},
		SanitizeDirectives: []string{"remove_pii", "mask_credentials", "truncate_excessive_tokens"},
		MaxTokenLimit: 2048,
		SecurityConstraints: SecurityConstraints{
			JailbreakDetection: true,
			PIIFiltering:       true,
			ContextIsolation:   true,
		},
		Enabled: true,
	}

	if err := doWithRetry(ctx, token, orgDomain, config); err != nil {
		fmt.Printf("Failed to apply prompt protection: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("Prompt protection configuration applied successfully")

	// Validate a test payload
	testPayload := PromptPayload{
		PromptText:  "Summarize the quarterly revenue report for division A.",
		ModelID:     "gpt-4-1106-preview",
		ContextHash: "a1b2c3d4e5f6",
	}
	safe, reason, err := validatePrompt(ctx, testPayload, config)
	if err != nil {
		fmt.Printf("Validation error: %v\n", err)
		os.Exit(1)
	}
	if !safe {
		fmt.Printf("Payload rejected: %s\n", reason)
	} else {
		fmt.Println("Payload validated and ready for LLM Gateway routing")
	}

	// Register security webhook
	webhookConfig := WebhookConfig{
		Name:        "SecurityOrchestrationHook",
		EndpointURL: "https://security.example.com/webhooks/genesys-llm",
		Events:      []string{"prompt.rejected", "prompt.sanitized", "jailbreak.detected"},
		Secret:      "xK9#mP2$vL8!qR4@wN6&yT1*zA5",
	}
	if err := registerSecurityWebhook(ctx, token, orgDomain, webhookConfig); err != nil {
		fmt.Printf("Webhook registration failed: %v\n", err)
	} else {
		fmt.Println("Security webhook registered successfully")
	}

	// Retrieve audit logs
	logs, nextToken, err := queryAuditLogs(ctx, token, orgDomain, 25, "")
	if err != nil {
		fmt.Printf("Audit query failed: %v\n", err)
	} else {
		fmt.Printf("Retrieved %d audit log entries. Next page token: %s\n", len(logs), nextToken)
		for _, log := range logs {
			fmt.Printf("  [%s] %s | Latency: %dms | Status: %s\n", log.Timestamp, log.EventID, log.LatencyMs, log.Status)
		}
	}
}

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: Expired access token or invalid client credentials.
• Fix: Regenerate the OAuth token. Implement token caching with a 300-second refresh buffer before the expires_in timestamp.
• Code Fix: Wrap API calls in a token validation middleware that checks time.Now().Add(300*time.Second).Before(tokenExpiry) before issuing requests.

Error: 400 Bad Request

• Cause: Schema validation failure on filterMatrix, sanitizeDirectives, or maxTokenLimit. Genesys Cloud rejects payloads with mismatched types or out-of-range values.
• Fix: Validate the JSON structure against the PromptProtectionConfig schema before transmission. Ensure maxTokenLimit falls between 100 and 4096.
• Code Fix: Use the go-playground/validator package as shown in Step 2. Parse the 400 response body to extract the exact field causing rejection.

Error: 429 Too Many Requests

• Cause: Exceeding the LLM Gateway rate limit (typically 10 requests per second per client ID).
• Fix: Implement exponential backoff with jitter. The doWithRetry function in Step 4 handles this automatically.
• Code Fix: Monitor the Retry-After header in the response. Adjust baseDelay dynamically if the header is present.

Error: 502 Bad Gateway

• Cause: Genesys Cloud LLM Gateway service temporarily unavailable or payload exceeds internal processing thresholds.
• Fix: Retry with a longer delay. Verify that sanitizeDirectives do not conflict with the target model capabilities.
• Code Fix: Add a 5xx retry loop with a maximum of 3 attempts. Log the full request/response pair for Genesys Cloud support tickets.

Official References

• Genesys Cloud LLM Gateway API Documentation
• Genesys Cloud OAuth 2.0 Guide
• Genesys Cloud Webhook Configuration
• Genesys Cloud Audit & Compliance Logs