Resolving Genesys Cloud SCIM Group Nesting with TypeScript

What You Will Build

A TypeScript utility that queries the Genesys Cloud SCIM API for group memberships, traverses nested group hierarchies using a recursive graph algorithm, flattens membership structures to resolve transitive dependencies, constructs batched PATCH requests to update user group associations, handles circular reference errors by detecting visited nodes, and generates a dependency map visualization for identity administrators.
This tutorial uses the Genesys Cloud SCIM v2 REST API with direct HTTP calls via axios for precise control over pagination, retries, and request cycles.
The implementation is written in modern TypeScript with full type safety, async/await patterns, and production-grade error handling.

Prerequisites

• OAuth2 client credentials with scopes: scim:groups:read, scim:users:read, scim:users:write
• Genesys Cloud API v2 base domain (e.g., api.mypurecloud.com or region-specific)
• Node.js 18 or higher
• Dependencies: axios, dotenv, typescript
• A configured .env file containing GENESYS_CLIENT_ID, GENESYS_CLIENT_SECRET, and GENESYS_DOMAIN

Authentication Setup

The SCIM API requires a valid bearer token obtained via the OAuth2 client credentials grant. The token expires after thirty minutes. The implementation caches the token and refreshes it automatically when expired.

import axios, { AxiosInstance } from 'axios';
import * as dotenv from 'dotenv';

dotenv.config();

const CLIENT_ID = process.env.GENESYS_CLIENT_ID!;
const CLIENT_SECRET = process.env.GENESYS_CLIENT_SECRET!;
const DOMAIN = process.env.GENESYS_DOMAIN!;

export interface ScimClient {
  instance: AxiosInstance;
  getToken: () => Promise<string>;
}

let tokenCache: { accessToken: string; expiresAt: number } | null = null;

async function getOAuthToken(): Promise<string> {
  const tokenUrl = `https://${DOMAIN}/oauth/token`;
  const credentials = Buffer.from(`${CLIENT_ID}:${CLIENT_SECRET}`).toString('base64');

  const response = await axios.post(
    tokenUrl,
    'grant_type=client_credentials',
    {
      headers: {
        'Authorization': `Basic ${credentials}`,
        'Content-Type': 'application/x-www-form-urlencoded',
      },
    }
  );

  const { access_token, expires_in } = response.data;
  tokenCache = {
    accessToken: access_token,
    expiresAt: Date.now() + (expires_in * 1000) - 5000, // Refresh 5s before expiry
  };
  return access_token;
}

async function getValidToken(): Promise<string> {
  if (tokenCache && Date.now() < tokenCache.expiresAt) {
    return tokenCache.accessToken;
  }
  return getOAuthToken();
}

export async function initScimClient(): Promise<ScimClient> {
  const instance = axios.create({
    baseURL: `https://${DOMAIN}/scim/v2`,
    headers: {
      'Accept': 'application/scim+json',
      'Content-Type': 'application/scim+json',
    },
  });

  instance.interceptors.request.use(async (config) => {
    const token = await getValidToken();
    config.headers.Authorization = `Bearer ${token}`;
    return config;
  });

  return { instance, getToken: getValidToken };
}

OAuth Scopes Required: scim:groups:read, scim:users:read, scim:users:write
HTTP Cycle Example:

POST /oauth/token HTTP/1.1
Host: api.mypurecloud.com
Authorization: Basic dG9rZW46c2VjcmV0
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials

{
  "access_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
  "token_type": "bearer",
  "expires_in": 1800,
  "scope": "scim:groups:read scim:users:read scim:users:write"
}

Implementation

Step 1: Fetch Groups with Pagination and Retry Logic

SCIM endpoints return paginated results using startIndex and itemsPerPage. The totalResults field indicates when pagination ends. Rate limiting (HTTP 429) requires exponential backoff. The following function handles both.

import { AxiosInstance, AxiosResponse } from 'axios';

interface ScimGroup {
  id: string;
  displayName: string;
  members: Array<{
    value: string;
    $ref?: string;
    display?: string;
  }>;
}

async function fetchWithRetry(instance: AxiosInstance, url: string, maxRetries = 3): Promise<AxiosResponse> {
  let attempt = 0;
  while (attempt < maxRetries) {
    try {
      return await instance.get(url);
    } catch (error: any) {
      if (error.response?.status === 429 && attempt < maxRetries - 1) {
        const delay = Math.pow(2, attempt) * 1000 + Math.random() * 1000;
        console.log(`Rate limited (429). Retrying in ${Math.round(delay)}ms...`);
        await new Promise(resolve => setTimeout(resolve, delay));
        attempt++;
      } else {
        throw error;
      }
    }
  }
  throw new Error('Max retries exceeded for 429 response');
}

export async function getAllGroups(instance: AxiosInstance): Promise<ScimGroup[]> {
  const groups: ScimGroup[] = [];
  let startIndex = 1;
  const itemsPerPage = 100;

  while (true) {
    const response = await fetchWithRetry(instance, `/Groups?startIndex=${startIndex}&itemsPerPage=${itemsPerPage}`);
    const data = response.data as { Resources: ScimGroup[]; totalResults: number };
    groups.push(...data.Resources);

    if (startIndex + itemsPerPage > data.totalResults) break;
    startIndex += itemsPerPage;
  }

  return groups;
}

Expected Response Structure:

{
  "schemas": ["urn:ietf:params:scim:api:messages:2.0:ListResponse"],
  "totalResults": 150,
  "startIndex": 1,
  "itemsPerPage": 100,
  "Resources": [
    {
      "id": "8a000000-0000-0000-0000-000000000001",
      "displayName": "Engineering",
      "members": [
        { "value": "8a000000-0000-0000-0000-000000000010", "$ref": "/Users/8a000000-0000-0000-0000-000000000010" },
        { "value": "8a000000-0000-0000-0000-000000000020", "$ref": "/Groups/8a000000-0000-0000-0000-000000000020" }
      ]
    }
  ]
}

Step 2: Build Membership Graph and Traverse with Cycle Detection

Group nesting creates a directed graph. A recursive depth-first search resolves transitive memberships. A visited set prevents infinite loops caused by circular references. The algorithm distinguishes between user IDs and group IDs by checking the $ref path or maintaining a registry of known group IDs.

interface MembershipGraph {
  groupId: string;
  displayName: string;
  directMembers: string[];
  nestedGroups: string[];
}

interface ResolvedMembership {
  userId: string;
  originatingGroups: string[];
}

export function buildGraph(groups: ScimGroup[]): Map<string, MembershipGraph> {
  const graph = new Map<string, MembershipGraph>();
  const groupIds = new Set(groups.map(g => g.id));

  for (const group of groups) {
    const directMembers: string[] = [];
    const nestedGroups: string[] = [];

    for (const member of group.members) {
      const isGroup = member.$ref?.startsWith('/Groups/');
      if (isGroup) {
        nestedGroups.push(member.value);
      } else {
        directMembers.push(member.value);
      }
    }

    graph.set(group.id, {
      groupId: group.id,
      displayName: group.displayName,
      directMembers,
      nestedGroups,
    });
  }

  return graph;
}

export function resolveTransitiveMemberships(
  graph: Map<string, MembershipGraph>,
  targetGroupId: string
): ResolvedMembership[] {
  const resolved = new Map<string, string[]>();
  const visited = new Set<string>();

  function traverse(groupId: string, path: string[]) {
    if (visited.has(groupId)) return;
    visited.add(groupId);

    const node = graph.get(groupId);
    if (!node) return;

    path = [...path, groupId];

    for (const userId of node.directMembers) {
      const existing = resolved.get(userId) || [];
      resolved.set(userId, [...existing, ...path]);
    }

    for (const nestedId of node.nestedGroups) {
      traverse(nestedId, path);
    }
  }

  traverse(targetGroupId, []);

  return Array.from(resolved.entries()).map(([userId, originatingGroups]) => ({
    userId,
    originatingGroups,
  }));
}

Cycle Detection Behavior:
When traverse encounters a groupId already in the visited set, it returns immediately. This prevents stack overflow and ensures each group is processed exactly once per resolution run. The path array tracks the ancestry chain for audit logging.

Step 3: Flatten Memberships and Batch PATCH Users

Genesys Cloud SCIM does not support nested groups natively. The flattened user list must be applied to the target group via PATCH /scim/v2/Groups/{id} or to individual users via PATCH /scim/v2/Users/{id}. The following implementation updates users directly to assign the resolved group, using batched requests with concurrency control.

import { AxiosInstance } from 'axios';

async function updateUserGroups(
  instance: AxiosInstance,
  userId: string,
  groupId: string
): Promise<void> {
  const payload = {
    Operations: [
      {
        op: 'add',
        path: 'members',
        value: [{ value: groupId, $ref: `/Groups/${groupId}` }]
      }
    ]
  };

  await fetchWithRetry(instance, `/Users/${userId}`, {
    method: 'PATCH',
    data: payload,
  });
}

export async function applyResolvedMemberships(
  instance: AxiosInstance,
  resolved: ResolvedMembership[],
  targetGroupId: string,
  concurrency = 5
): Promise<void[]> {
  const results: Promise<void>[] = [];

  for (let i = 0; i < resolved.length; i += concurrency) {
    const batch = resolved.slice(i, i + concurrency);
    const batchPromises = batch.map(({ userId }) => 
      updateUserGroups(instance, userId, targetGroupId)
    );
    results.push(...batchPromises);
  }

  return Promise.all(results);
}

HTTP PATCH Cycle Example:

PATCH /scim/v2/Users/8a000000-0000-0000-0000-000000000010 HTTP/1.1
Host: api.mypurecloud.com
Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...
Content-Type: application/scim+json
Accept: application/scim+json

{
  "Operations": [
    {
      "op": "add",
      "path": "members",
      "value": [
        {
          "value": "8a000000-0000-0000-0000-000000000001",
          "$ref": "/Groups/8a000000-0000-0000-0000-000000000001"
        }
      ]
    }
  ]
}

Response: HTTP/1.1 200 OK (SCIM v2 returns 200 on successful PATCH with the updated resource body)

Step 4: Generate Dependency Map Visualization

Identity administrators require a structural overview of resolved memberships. The following function generates Mermaid diagram syntax for rendering in documentation or dashboards.

export function generateDependencyVisualization(
  graph: Map<string, MembershipGraph>,
  resolved: ResolvedMembership[]
): string {
  let mermaid = 'graph TD\n';
  mermaid += '  subgraph SCIM_Groups\n';
  
  for (const [, node] of graph) {
    mermaid += `    G_${node.groupId}["${node.displayName}\\n(${node.groupId})"]\n`;
  }
  mermaid += '  end\n\n';

  mermaid += '  subgraph Resolved_Users\n';
  const uniqueUsers = new Set(resolved.map(r => r.userId));
  for (const userId of uniqueUsers) {
    mermaid += `    U_${userId}["User\\n${userId}"]\n`;
  }
  mermaid += '  end\n\n';

  for (const [, node] of graph) {
    for (const nestedId of node.nestedGroups) {
      mermaid += `    G_${node.groupId} --> G_${nestedId}\n`;
    }
  }

  for (const { userId, originatingGroups } of resolved) {
    for (const groupId of originatingGroups) {
      mermaid += `    G_${groupId} -.-> U_${userId}\n`;
    }
  }

  return mermaid;
}

Complete Working Example

The following script integrates all components. Save it as resolve-scim-nesting.ts and run with npx ts-node resolve-scim-nesting.ts.

import { initScimClient, getAllGroups, buildGraph, resolveTransitiveMemberships, applyResolvedMemberships, generateDependencyVisualization } from './scim-resolver';

async function main() {
  const targetGroupId = process.env.TARGET_GROUP_ID!;
  if (!targetGroupId) {
    console.error('TARGET_GROUP_ID environment variable is required');
    process.exit(1);
  }

  console.log('Initializing SCIM client...');
  const { instance } = await initScimClient();

  console.log('Fetching all groups...');
  const groups = await getAllGroups(instance);
  console.log(`Retrieved ${groups.length} groups`);

  console.log('Building membership graph...');
  const graph = buildGraph(groups);

  console.log('Resolving transitive memberships for target group:', targetGroupId);
  const resolved = resolveTransitiveMemberships(graph, targetGroupId);
  console.log(`Resolved ${resolved.length} unique user memberships`);

  console.log('Generating dependency visualization...');
  const mermaidDiagram = generateDependencyVisualization(graph, resolved);
  console.log('Mermaid Diagram:\n---\n' + mermaidDiagram + '\n---');

  console.log('Applying resolved memberships to users...');
  try {
    await applyResolvedMemberships(instance, resolved, targetGroupId);
    console.log('Successfully applied group associations to all resolved users.');
  } catch (error: any) {
    console.error('Failed during batch update:', error.response?.data || error.message);
  }
}

main().catch(console.error);

Common Errors & Debugging

Error: HTTP 401 Unauthorized

• Cause: The OAuth token is expired, malformed, or the client credentials are incorrect.
• Fix: Verify GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET match a configured OAuth2 client. Ensure the token refresh logic executes before each request. Check that the domain matches your Genesys Cloud region.
• Code Fix: The getValidToken function automatically refreshes when Date.now() >= expiresAt. Add explicit logging to confirm token acquisition.

Error: HTTP 403 Forbidden

• Cause: The OAuth client lacks the required scim:groups:read or scim:users:write scopes.
• Fix: Navigate to the Genesys Cloud admin console, locate the OAuth client, and append the missing scopes. Restart the script to fetch a new token with updated permissions.

Error: HTTP 429 Too Many Requests

• Cause: Exceeding the SCIM API rate limit (typically 100 requests per second per tenant).
• Fix: The fetchWithRetry function implements exponential backoff. Increase the maxRetries parameter or reduce the concurrency value in applyResolvedMemberships to 3 or lower.
• Code Fix: Monitor the Retry-After header if available, though the implemented delay strategy aligns with Genesys Cloud throttling behavior.

Error: Maximum Call Stack Size Exceeded

• Cause: Circular group references without visited node tracking.
• Fix: The resolveTransitiveMemberships function uses a visited set. Ensure the set is cleared only when starting a new root group resolution. Never pass a visited set across independent resolution runs.

Error: SCIM 400 Bad Request on PATCH

• Cause: Invalid JSON structure or missing Operations array wrapper.
• Fix: SCIM v2 requires the Operations array with op, path, and value fields. Verify the payload matches the SCIM specification exactly. Remove trailing commas and ensure all UUIDs are properly quoted.

Official References

• Genesys Cloud SCIM API Documentation
• SCIM v2 Specification (RFC 7643)
• OAuth 2.0 Client Credentials Flow
• TypeScript Axios Integration Guide