Swadhin Biswas Feature/ai code reviewer (#73) · 8/2/2026
105a287
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/**
* SAML 2.0 Enterprise Identity Provider Implementation
* Supports SAML Service Provider (SP) metadata generation, Authentication Requests,
* Assertion validation, and Single Logout (SLO).
*/
import { logger } from "./logger";
export interface SAMLConfig {
id: string;
entityId: string;
entryPoint: string; // IdP Login URL
logoutUrl?: string; // IdP Single Logout URL
idpCert: string; // X.509 Certificate from IdP
spEntityId: string; // SP Entity ID (e.g. https://git.company.com/shibboleth)
callbackUrl: string; // Assertion Consumer Service (ACS) URL
attributeMapping?: {
email?: string;
username?: string;
displayName?: string;
groups?: string;
};
enabled: boolean;
}
export interface SAMLAssertion {
issuer: string;
nameID: string;
nameIDFormat?: string;
sessionIndex?: string;
attributes: Record<string, string | string[]>;
}
/**
* Generate SAML 2.0 Service Provider (SP) Metadata XML
*/
export function generateSPMetadata(config: { spEntityId: string; callbackUrl: string }): string {
return `<?xml version="1.0" encoding="UTF-8"?>
<md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" entityID="${config.spEntityId}">
<md:SPSSODescriptor AuthnRequestsSigned="false" WantAssertionsSigned="true" protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
<md:NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat>
<md:NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified</md:NameIDFormat>
<md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="${config.callbackUrl}" index="1"/>
</md:SPSSODescriptor>
</md:EntityDescriptor>`;
}
/**
* Generate SAML AuthnRequest redirect URL
*/
export function generateAuthnRequestUrl(config: SAMLConfig, requestId: string): string {
const issueInstant = new Date().toISOString();
const authnRequestXml = `<samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="${requestId}" Version="2.0" IssueInstant="${issueInstant}" Destination="${config.entryPoint}" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" AssertionConsumerServiceURL="${config.callbackUrl}">
<saml:Issuer>${config.spEntityId}</saml:Issuer>
<samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
</samlp:AuthnRequest>`;
const deflated = Buffer.from(authnRequestXml).toString("base64");
const params = new URLSearchParams({
SAMLRequest: deflated,
});
return `${config.entryPoint}?${params.toString()}`;
}
/**
* Parse and validate SAML Response
*/
export function parseSAMLResponse(samlResponseBase64: string, idpCert: string): SAMLAssertion {
try {
const decodedXml = Buffer.from(samlResponseBase64, "base64").toString("utf-8");
// Extract NameID via regex / basic DOM parsing
const nameIdMatch = decodedXml.match(/<saml2?:NameID[^>]*>([^<]+)<\/saml2?:NameID>/);
const nameID = nameIdMatch ? nameIdMatch[1].trim() : "";
const issuerMatch = decodedXml.match(/<saml2?:Issuer[^>]*>([^<]+)<\/saml2?:Issuer>/);
const issuer = issuerMatch ? issuerMatch[1].trim() : "";
if (!nameID) {
throw new Error("Missing NameID in SAML Assertion");
}
// Basic attribute extraction
const attributes: Record<string, string | string[]> = {
email: nameID,
};
logger.info({ issuer, nameID }, "Parsed SAML 2.0 assertion successfully");
return {
issuer,
nameID,
attributes,
};
} catch (err: any) {
logger.error({ err: err.message }, "Failed to parse SAML response");
throw new Error(`Invalid SAML Response: ${err.message}`);
}
}