Synchronizing Role-Based Access Control Attributes via Genesys Cloud SCIM 2.0 with a TypeScript CLI

What You Will Build

A TypeScript command-line interface that retrieves Genesys Cloud users via SCIM 2.0, maps external LDAP group memberships to custom user extensions, handles server-side pagination, and applies conditional PUT updates with ETag validation and automatic 429 retry logic. This tutorial uses the Genesys Cloud REST API directly with axios. The implementation covers TypeScript, Node.js, and SCIM 2.0 standards.

Prerequisites

• OAuth 2.0 Client Credentials grant configured in Genesys Cloud with scopes scim:users:read and scim:users:write
• Genesys Cloud SCIM 2.0 API (base path /api/v2/scim/v2/)
• Node.js 18+ and TypeScript 5+
• Dependencies: axios, dotenv, commander, @types/node
• Environment variables: GENESYS_CLOUD_REGION, GENESYS_CLOUD_CLIENT_ID, GENESYS_CLOUD_CLIENT_SECRET

Authentication Setup

Genesys Cloud SCIM endpoints require a bearer token obtained via the OAuth 2.0 Client Credentials flow. The token expires after one hour, so the CLI must handle token acquisition and reuse. The following module fetches the token and caches it in memory for the duration of the process.

import axios, { AxiosResponse } from 'axios';
import dotenv from 'dotenv';

dotenv.config();

interface TokenResponse {
  access_token: string;
  token_type: string;
  expires_in: number;
  scope: string;
}

const REGION = process.env.GENESYS_CLOUD_REGION || 'us-east-1';
const CLIENT_ID = process.env.GENESYS_CLOUD_CLIENT_ID!;
const CLIENT_SECRET = process.env.GENESYS_CLOUD_CLIENT_SECRET!;
const TOKEN_URL = `https://api.${REGION}.mygenesys.com/oauth/token`;

let cachedToken: string | null = null;
let tokenExpiry: number = 0;

export async function getAccessToken(): Promise<string> {
  const now = Date.now();
  if (cachedToken && now < tokenExpiry - 60000) {
    return cachedToken;
  }

  try {
    const response: AxiosResponse<TokenResponse> = await axios.post(
      TOKEN_URL,
      null,
      {
        auth: { username: CLIENT_ID, password: CLIENT_SECRET },
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        params: { grant_type: 'client_credentials', scope: 'scim:users:read scim:users:write' }
      }
    );

    cachedToken = response.data.access_token;
    tokenExpiry = now + (response.data.expires_in * 1000);
    return cachedToken;
  } catch (error) {
    if (axios.isAxiosError(error)) {
      console.error('OAuth token fetch failed:', error.response?.status, error.response?.data);
    }
    throw error;
  }
}

The grant_type parameter must be client_credentials. The scope parameter explicitly requests scim:users:read and scim:users:write. The code subtracts sixty seconds from the expiry timestamp to prevent edge-case 401 errors during active requests.

Implementation

Step 1: Initialize the HTTP Client and Configure SCIM Headers

Genesys Cloud SCIM endpoints require the Content-Type: application/scim+json header for write operations and Accept: application/scim+json for read operations. The following factory function creates an AxiosInstance with an interceptor that attaches the bearer token automatically.

import axios, { AxiosInstance, InternalAxiosRequestConfig } from 'axios';
import { getAccessToken } from './auth';

export function createScimClient(): AxiosInstance {
  const REGION = process.env.GENESYS_CLOUD_REGION || 'us-east-1';
  const client = axios.create({
    baseURL: `https://api.${REGION}.mygenesys.com/api/v2/scim/v2`,
    headers: {
      Accept: 'application/scim+json',
      'Content-Type': 'application/scim+json'
    }
  });

  client.interceptors.request.use(async (config: InternalAxiosRequestConfig) => {
    const token = await getAccessToken();
    config.headers.Authorization = `Bearer ${token}`;
    return config;
  });

  return client;
}

The interceptor executes before every request, ensuring the token is fresh. If the token refresh fails, the interceptor throws, and the calling code receives a standard Axios error with a 401 status.

Step 2: Paginated User Retrieval and LDAP Group Mapping

SCIM 2.0 pagination in Genesys Cloud uses startIndex and count query parameters. The server returns totalResults, startIndex, and itemsPerPage in the response envelope. The following function iterates through all pages, accumulates users, and maps LDAP group memberships to a custom attribute array.

import { AxiosInstance } from 'axios';

export interface ScimUser {
  schemas: string[];
  id: string;
  externalId: string;
  userName: string;
  name: { givenName: string; familyName: string };
  active: boolean;
  customAttributes: { name: string; value: string }[];
  meta: { location: string; etag: string; lastModified: string };
}

export interface ScimUserList {
  schemas: string[];
  totalResults: number;
  startIndex: number;
  itemsPerPage: number;
  Resources: ScimUser[];
}

async function fetchAllUsers(client: AxiosInstance, ldapGroupMap: Record<string, string[]>): Promise<ScimUser[]> {
  const allUsers: ScimUser[] = [];
  let startIndex = 1;
  const count = 50;

  while (true) {
    const response = await client.get<ScimUserList>('/Users', {
      params: { count, startIndex }
    });

    const users = response.data.Resources || [];
    
    // Map LDAP groups to customAttributes
    for (const user of users) {
      const externalId = user.externalId;
      const ldapGroups = ldapGroupMap[externalId] || [];
      
      // Preserve existing custom attributes, remove stale ldapGroupMemberships
      const existingAttrs = user.customAttributes?.filter(
        attr => attr.name !== 'ldapGroupMemberships'
      ) || [];

      if (ldapGroups.length > 0) {
        existingAttrs.push({
          name: 'ldapGroupMemberships',
          value: JSON.stringify(ldapGroups)
        });
      }

      user.customAttributes = existingAttrs;
    }

    allUsers.push(...users);

    // SCIM pagination stops when startIndex exceeds totalResults
    if (startIndex + users.length >= response.data.totalResults) {
      break;
    }
    startIndex += count;
  }

  return allUsers;
}

The pagination loop terminates when startIndex + users.length meets or exceeds totalResults. This prevents infinite loops when the server returns fewer items than requested on the final page. The LDAP mapping logic replaces the ldapGroupMemberships custom attribute with the current group list. Storing groups as a JSON string satisfies the SCIM customAttributes value type constraint while preserving array structure.

Step 3: Conditional PUT Updates with ETag Validation and Retry

Genesys Cloud supports optimistic concurrency control via ETags. When updating a user, the If-Match header must contain the ETag from the original GET response. If another process modifies the user between retrieval and update, the server returns 412 Precondition Failed. The following function applies delta updates with exponential backoff for 429 rate limits.

import { AxiosInstance, AxiosError } from 'axios';

async function updateUserWithRetry(
  client: AxiosInstance,
  user: ScimUser,
  maxRetries: number = 5
): Promise<boolean> {
  let attempts = 0;
  let delay = 1000;

  while (attempts < maxRetries) {
    try {
      await client.put(`/Users/${user.id}`, user, {
        headers: {
          'If-Match': user.meta.etag
        }
      });
      console.log(`Updated user ${user.id} (${user.userName})`);
      return true;
    } catch (error) {
      if (!axios.isAxiosError(error)) throw error;

      const status = error.response?.status;

      if (status === 429) {
        attempts++;
        const jitter = Math.random() * 500;
        await new Promise(resolve => setTimeout(resolve, delay + jitter));
        delay *= 2;
        continue;
      }

      if (status === 412) {
        console.warn(`ETag mismatch for user ${user.id}. Skipping to prevent data loss.`);
        return false;
      }

      if (status === 401 || status === 403) {
        console.error(`Authentication/Authorization failed for user ${user.id}: ${status}`);
        throw error;
      }

      console.error(`Unexpected error updating user ${user.id}:`, error.response?.data);
      throw error;
    }
  }

  console.error(`Max retries exceeded for user ${user.id}`);
  return false;
}

The retry logic targets 429 responses exclusively. The jitter prevents thundering herd behavior when multiple CLI instances synchronize concurrently. The 412 handler aborts the update for that specific user, preserving data integrity. The If-Match header value must match the exact string returned in meta.etag, including quotes if present.

Complete Working Example

The following script combines authentication, pagination, LDAP mapping, and conditional updates into a single executable CLI. Save the file as sync-scim-users.ts and run it with npx ts-node sync-scim-users.ts.

import { createScimClient } from './scim-client';
import { fetchAllUsers } from './scim-pagination';
import { updateUserWithRetry } from './scim-updater';
import dotenv from 'dotenv';

dotenv.config();

// Simulated LDAP group lookup. Replace with actual LDAP sync logic.
function getLdapGroupMappings(): Record<string, string[]> {
  return {
    'EXT-10042': ['gen-support-l1', 'gen-voice-admin'],
    'EXT-10088': ['gen-sales-dev'],
    'EXT-10155': ['gen-it-security', 'gen-cloud-admin']
  };
}

async function main() {
  console.log('Initializing Genesys Cloud SCIM sync...');
  const client = createScimClient();
  const ldapMappings = getLdapGroupMappings();

  try {
    const users = await fetchAllUsers(client, ldapMappings);
    console.log(`Retrieved ${users.length} users. Starting delta updates...`);

    const updatePromises = users.map(user => updateUserWithRetry(client, user));
    const results = await Promise.all(updatePromises);

    const successCount = results.filter(Boolean).length;
    const skippedCount = results.length - successCount;

    console.log(`Sync complete. Updated: ${successCount}, Skipped (ETag mismatch): ${skippedCount}`);
  } catch (error) {
    console.error('Sync failed:', error);
    process.exit(1);
  }
}

main();

The script uses Promise.all to parallelize updates. Genesys Cloud SCIM endpoints handle concurrent requests efficiently, but you may need to throttle the concurrency with a semaphore library if your org has strict rate limits. The LDAP mapping function is isolated for easy replacement with a real directory sync service.

Common Errors & Debugging

Error: 401 Unauthorized

• What causes it: Expired OAuth token, invalid client credentials, or missing scim:users:read scope.
• How to fix it: Verify the client ID and secret in your environment variables. Ensure the token request includes scope=scim:users:read scim:users:write. Check the token expiry logic in getAccessToken.
• Code showing the fix: The authentication module already implements a sixty-second safety buffer before expiry. If 401 persists, force a token refresh by clearing cachedToken.

Error: 403 Forbidden

• What causes it: The OAuth client lacks the required SCIM scopes, or the user executing the CLI does not have the User Admin or SCIM User Admin role.
• How to fix it: Navigate to the Genesys Cloud admin console, locate the OAuth 2.0 client, and add scim:users:read and scim:users:write to the allowed scopes. Verify the service account has the correct role assignments.

Error: 412 Precondition Failed

• What causes it: The If-Match header value does not match the current ETag of the user resource. Another process modified the user between the GET and PUT calls.
• How to fix it: Implement a re-fetch strategy if strict consistency is required. The provided code skips the user to prevent overwriting concurrent changes. For critical syncs, add a retry loop that re-fetches the user, re-applies the LDAP mapping, and retries the PUT.

Error: 429 Too Many Requests

• What causes it: The CLI exceeded the Genesys Cloud API rate limits. SCIM endpoints share the general REST rate limit pool.
• How to fix it: The updateUserWithRetry function includes exponential backoff with jitter. If 429 errors persist, reduce parallelism by replacing Promise.all with a sequential loop or a concurrency limiter like p-limit.

Error: 500 Internal Server Error

• What causes it: Malformed SCIM payload, invalid custom attribute schema mapping, or transient platform outage.
• How to fix it: Validate that customAttributes contains only strings for the value field. Ensure the custom attribute ldapGroupMemberships is pre-configured in the Genesys Cloud SCIM attribute mapping settings. Check the Genesys Cloud status page for platform incidents.

Official References

• Genesys Cloud SCIM 2.0 API Documentation
• OAuth 2.0 Client Credentials Flow
• SCIM 2.0 Pagination Specification
• Conditional Requests and ETag Validation