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import { InjectModel } from '@nestjs/mongoose'; import { Model } from 'mongoose'; import * as crypto from 'crypto'; import * as bcrypt from 'bcrypt'; import { SocialIdentity, LoginAttempt, AccountRecoveryRequest, IdentityLinkHistory, } from './schemas/identity.schema'; import { User } from '../user/schemas/user.schema'; import { RefreshToken } from '../auth/schemas/refresh-token.schema'; import { GoogleAuthProvider, GoogleAuthResult, } from './social-auth/google-auth.provider'; import { AppleAuthProvider, AppleAuthResult, AppleUserInfo, } from './social-auth/apple-auth.provider'; import { MfaService } from './mfa/mfa.service'; import { DeviceTrustService, DeviceFingerprintInput, } from './device-trust/device-trust.service'; import { SessionService } from './sessions/session.service'; import { EventBusService } from '../events/event-bus.service'; import { AuditLogService } from '../audit/audit-log.service'; /** * Identity Service — Unified orchestrator for all identity operations. * * Coordinates: * - Social authentication (Google, Apple) * - MFA challenge flow * - Device trust registration * - Session creation * - Login attempt tracking * - Account recovery (password reset, email verification) * * Does NOT replace existing AuthService for email/password flows. * Extends the auth system with social login, MFA, and device trust layers. */ @Injectable() export class IdentityService { private readonly logger = new Logger(IdentityService.name); constructor( @InjectModel(SocialIdentity.name) private readonly socialIdentityModel: Model<SocialIdentity>, @InjectModel(LoginAttempt.name) private readonly loginAttemptModel: Model<LoginAttempt>, @InjectModel(AccountRecoveryRequest.name) private readonly recoveryModel: Model<AccountRecoveryRequest>, @InjectModel(IdentityLinkHistory.name) private readonly linkHistoryModel: Model<IdentityLinkHistory>, @InjectModel(User.name) private readonly userModel: Model<User>, @InjectModel(RefreshToken.name) private readonly refreshTokenModel: Model<RefreshToken>, private readonly googleAuth: GoogleAuthProvider, private readonly appleAuth: AppleAuthProvider, private readonly mfaService: MfaService, private readonly deviceTrust: DeviceTrustService, private readonly sessionService: SessionService, private readonly eventBus: EventBusService, private readonly auditLog: AuditLogService, ) {} // ============================================================ // SOCIAL LOGIN — Google // ============================================================ /** * Authenticates or registers a user via Google Sign-In. * * Flow: * 1. Verify Google ID token * 2. Look up existing social identity or user by email * 3. Link identity / create user as needed * 4. Check MFA requirement * 5. Register device, create session, issue tokens */ async loginWithGoogle( idToken: string, tenantId: string, context: { ipAddress?: string; userAgent?: string; fingerprint?: DeviceFingerprintInput; }, ): Promise<{ user: any; accessToken?: string; refreshToken?: string; sessionId?: string; mfaRequired?: boolean; mfaChallengeId?: string; mfaMethods?: string[]; isNewUser: boolean; }> { // 1. Verify the Google ID token const googleResult = await this.googleAuth.verifyIdToken(idToken); // 2. Record login attempt const attemptData: Partial<LoginAttempt> = { email: googleResult.email, tenantId, method: 'google', ipAddress: context.ipAddress, userAgent: context.userAgent, }; try { return await this.processSocialLogin( 'google', googleResult, tenantId, context, attemptData, ); } catch (error) { await this.recordLoginAttempt({ ...attemptData, result: 'failed', failureReason: error.message, }); throw error; } } // ============================================================ // SOCIAL LOGIN — Apple // ============================================================ /** * Authenticates or registers a user via Apple Sign-In. */ async loginWithApple( idToken: string, tenantId: string, userInfo?: AppleUserInfo, context?: { ipAddress?: string; userAgent?: string; fingerprint?: DeviceFingerprintInput; }, ): Promise<{ user: any; accessToken?: string; refreshToken?: string; sessionId?: string; mfaRequired?: boolean; mfaChallengeId?: string; mfaMethods?: string[]; isNewUser: boolean; }> { const appleResult = await this.appleAuth.verifyIdToken(idToken, userInfo); const attemptData: Partial<LoginAttempt> = { email: appleResult.email || 'private-relay@apple', tenantId, method: 'apple', ipAddress: context?.ipAddress, userAgent: context?.userAgent, }; try { return await this.processSocialLogin( 'apple', appleResult, tenantId, context || {}, attemptData, ); } catch (error) { await this.recordLoginAttempt({ ...attemptData, result: 'failed', failureReason: error.message, }); throw error; } } // ============================================================ // IDENTITY LINKING // ============================================================ /** * Links a social identity to an existing user account. * User must be authenticated (e.g., via email/password) before linking. */ async linkSocialIdentity( userId: string, tenantId: string, provider: 'google' | 'apple', idToken: string, userInfo?: AppleUserInfo, context?: { ipAddress?: string; userAgent?: string }, ): Promise<{ linked: boolean; provider: string }> { let providerUserId: string; let email: string | null; let displayName: string; let avatarUrl: string | null; let rawProfile: any; if (provider === 'google') { const result = await this.googleAuth.verifyIdToken(idToken); providerUserId = result.providerUserId; email = result.email; displayName = result.displayName; avatarUrl = result.avatarUrl; rawProfile = result.rawProfile; } else { const result = await this.appleAuth.verifyIdToken(idToken, userInfo); providerUserId = result.providerUserId; email = result.email; displayName = result.displayName; avatarUrl = null; rawProfile = result.rawProfile; } // Check if this social identity is already linked to another user const existingLink = await this.socialIdentityModel .findOne({ provider, providerUserId, }) .exec(); if (existingLink && existingLink.userId !== userId) { throw new ConflictException( `This ${provider} account is already linked to another user`, ); } if (existingLink && existingLink.userId === userId) { throw new BadRequestException( `This ${provider} account is already linked to your account`, ); } // Create the link await this.socialIdentityModel.create({ userId, tenantId, provider, providerUserId, email, displayName, avatarUrl, rawProfile, lastUsedAt: new Date(), }); // Record in link history await this.linkHistoryModel.create({ userId, tenantId, provider, providerUserId, action: 'linked', performedBy: userId, ipAddress: context?.ipAddress, userAgent: context?.userAgent, }); await this.auditLog.log({ tenantId, userId, action: 'identity.social.linked', resource: 'SocialIdentity', metadata: { provider, providerUserId }, }); return { linked: true, provider }; } /** * Unlinks a social identity from a user account. */ async unlinkSocialIdentity( userId: string, tenantId: string, provider: 'google' | 'apple', context?: { ipAddress?: string; userAgent?: string }, ): Promise<void> { const identity = await this.socialIdentityModel .findOne({ userId, tenantId, provider, isRevoked: false, }) .exec(); if (!identity) { throw new NotFoundException( `No ${provider} identity linked to this account`, ); } // Don't allow unlinking if it's the only auth method and no password is set const user = await this.userModel.findOne({ _id: userId }).exec(); if (user && !user.password) { const otherIdentities = await this.socialIdentityModel .countDocuments({ userId, tenantId, isRevoked: false, provider: { $ne: provider }, }) .exec(); if (otherIdentities === 0) { throw new BadRequestException( 'Cannot unlink the only authentication method. Set a password first.', ); } } identity.isRevoked = true; await identity.save(); await this.linkHistoryModel.create({ userId, tenantId, provider, providerUserId: identity.providerUserId, action: 'unlinked', performedBy: userId, ipAddress: context?.ipAddress, userAgent: context?.userAgent, }); await this.auditLog.log({ tenantId, userId, action: 'identity.social.unlinked', resource: 'SocialIdentity', metadata: { provider }, }); } /** * Gets all linked social identities for a user. */ async getLinkedIdentities(userId: string, tenantId: string): Promise<any[]> { const identities = await this.socialIdentityModel .find({ userId, tenantId, isRevoked: false, }) .lean() .exec(); return identities.map((i) => ({ id: (i as any)._id.toString(), provider: i.provider, email: i.email, displayName: i.displayName, avatarUrl: i.avatarUrl, lastUsedAt: i.lastUsedAt, createdAt: i.createdAt, })); } // ============================================================ // ACCOUNT RECOVERY // ============================================================ /** * Initiates a password reset by generating a token and dispatching an email. */ async initiatePasswordReset( email: string, tenantId: string, ipAddress?: string, ): Promise<{ initiated: boolean }> { const user = await this.userModel .findOne({ email: email.toLowerCase(), tenantId }) .exec(); // Always return success (don't leak user existence) if (!user) { this.logger.debug( `Password reset requested for non-existent email: ${email}`, ); return { initiated: true }; } // Invalidate any existing tokens await this.recoveryModel .updateMany( { userId: (user as any)._id.toString(), tenantId, type: 'password_reset', isUsed: false, }, { isUsed: true }, ) .exec(); const token = crypto.randomBytes(32).toString('hex'); const expiresAt = new Date(Date.now() + 3600000); // 1 hour await this.recoveryModel.create({ userId: (user as any)._id.toString(), tenantId, type: 'password_reset', token, expiresAt, ipAddress, }); await this.eventBus.publish( 'platform.identity.password_reset.requested.v1', { userId: (user as any)._id.toString(), tenantId, email: user.email, token, expiresAt, }, tenantId, ); return { initiated: true }; } /** * Completes a password reset by verifying the token and updating the password. */ async completePasswordReset( token: string, newPassword: string, ipAddress?: string, ): Promise<{ success: boolean }> { const request = await this.recoveryModel .findOne({ token, type: 'password_reset', isUsed: false, }) .exec(); if (!request) { throw new BadRequestException('Invalid or expired password reset token'); } if (request.expiresAt < new Date()) { throw new BadRequestException('Password reset token has expired'); } // Hash the new password const passwordHash = await bcrypt.hash(newPassword, 12); // Update user password await this.userModel .findByIdAndUpdate(request.userId, { password: passwordHash, }) .exec(); // Mark token as used request.isUsed = true; request.usedAt = new Date(); request.ipAddress = ipAddress ?? ''; await request.save(); // Revoke all sessions (security measure) await this.sessionService.revokeAllSessions( request.userId, request.tenantId, 'Password reset', ); await this.eventBus.publish( 'platform.identity.password_reset.completed.v1', { userId: request.userId, tenantId: request.tenantId, }, request.tenantId, ); return { success: true }; } /** * Initiates email verification. */ async initiateEmailVerification( userId: string, tenantId: string, email: string, ): Promise<{ initiated: boolean }> { const token = crypto.randomBytes(32).toString('hex'); const expiresAt = new Date(Date.now() + 86400000); // 24 hours await this.recoveryModel.create({ userId, tenantId, type: 'email_verification', token, expiresAt, }); await this.eventBus.publish( 'platform.identity.email_verification.requested.v1', { userId, tenantId, email, token, expiresAt, }, tenantId, ); return { initiated: true }; } /** * Completes email verification. */ async completeEmailVerification( token: string, ): Promise<{ verified: boolean }> { const request = await this.recoveryModel .findOne({ token, type: 'email_verification', isUsed: false, }) .exec(); if (!request || request.expiresAt < new Date()) { throw new BadRequestException( 'Invalid or expired email verification token', ); } await this.userModel .findByIdAndUpdate(request.userId, { isEmailVerified: true, }) .exec(); request.isUsed = true; request.usedAt = new Date(); await request.save(); await this.eventBus.publish( 'platform.identity.email.verified.v1', { userId: request.userId, tenantId: request.tenantId, }, request.tenantId, ); return { verified: true }; } // ============================================================ // LOGIN ATTEMPT TRACKING // ============================================================ /** * Gets recent login attempts for a user. */ async getLoginHistory( userId: string, tenantId: string, limit = 20, ): Promise<any[]> { return this.loginAttemptModel .find({ userId, tenantId }) .sort({ createdAt: -1 }) .limit(limit) .lean() .exec(); } // ============================================================ // PRIVATE HELPERS // ============================================================ /** * Core social login processing shared by Google and Apple. */ private async processSocialLogin( provider: 'google' | 'apple', authResult: GoogleAuthResult | AppleAuthResult, tenantId: string, context: { ipAddress?: string; userAgent?: string; fingerprint?: DeviceFingerprintInput; }, attemptData: Partial<LoginAttempt>, ): Promise<any> { // Look up existing social identity let socialIdentity = await this.socialIdentityModel .findOne({ provider, providerUserId: authResult.providerUserId, tenantId, isRevoked: false, }) .exec(); let user: User | null = null; const isNewUser = false; if (socialIdentity) { // Existing social identity — fetch the linked user user = await this.userModel.findById(socialIdentity.userId).exec(); if (!user) { throw new UnauthorizedException('User account not found'); } // Update social identity usage socialIdentity.lastUsedAt = new Date(); if ('avatarUrl' in authResult && authResult.avatarUrl) { socialIdentity.avatarUrl = authResult.avatarUrl; } await socialIdentity.save(); } else if (authResult.email) { // No social identity — try to find user by email user = await this.userModel .findOne({ email: authResult.email.toLowerCase(), tenantId, }) .exec(); if (user) { // User exists — auto-link the social identity socialIdentity = await this.socialIdentityModel.create({ userId: (user as any)._id.toString(), tenantId, provider, providerUserId: authResult.providerUserId, email: authResult.email, displayName: authResult.displayName, avatarUrl: 'avatarUrl' in authResult ? authResult.avatarUrl : null, rawProfile: authResult.rawProfile, lastUsedAt: new Date(), }); await this.linkHistoryModel.create({ userId: (user as any)._id.toString(), tenantId, provider, providerUserId: authResult.providerUserId, action: 'linked', performedBy: (user as any)._id.toString(), reason: 'Auto-linked on social login', }); } else { // No user — create new user via social registration // NOTE: For multi-tenant systems, the tenant must exist and allow registration. // This creates a basic user; tenant setup (roles, subscription) is handled // by the existing AuthService registration flow or a dedicated onboarding flow. throw new BadRequestException( `No account found for ${authResult.email} in this organization. ` + 'Please register first or contact your administrator.', ); } } else { throw new UnauthorizedException( 'Unable to identify user from social login', ); } if (!user || !user.isActive) { throw new UnauthorizedException('Account is disabled'); } const userId = (user as any)._id.toString(); // Check MFA requirement const mfaEnabled = await this.mfaService.isMfaEnabled(userId, tenantId); const mfaRequired = await this.mfaService.isMfaRequired( tenantId, user.roles || [], ); if (mfaEnabled || mfaRequired) { const methods = await this.mfaService.getEnrolledMethods( userId, tenantId, ); const primaryMethod = methods.find((m) => m.isPrimary) || methods[0]; if (primaryMethod) { const challenge = await this.mfaService.createChallenge( userId, tenantId, primaryMethod.type, { ipAddress: context.ipAddress, userAgent: context.userAgent }, ); await this.recordLoginAttempt({ ...attemptData, userId, result: 'mfa_required', }); return { user: { id: userId, email: user.email }, mfaRequired: true, mfaChallengeId: challenge.challengeId, mfaMethods: methods.map((m) => m.type), isNewUser: false, }; } } // No MFA required — proceed to session creation await this.recordLoginAttempt({ ...attemptData, userId, result: 'success', }); // Register device if fingerprint provided if (context.fingerprint) { const deviceResult = await this.deviceTrust.registerDevice( userId, tenantId, context.fingerprint, { ipAddress: context.ipAddress, userAgent: context.userAgent }, ); // Auto-trust device on social login (already verified by provider) if (deviceResult.isNew || !deviceResult.isTrusted) { await this.deviceTrust.trustDevice( userId, tenantId, deviceResult.deviceId, 90, ); } } // Update user's last login user.lastLoginAt = new Date(); if ('avatarUrl' in authResult && authResult.avatarUrl && !user.avatar) { user.avatar = authResult.avatarUrl; } await user.save(); // Create session (tokens will be generated by the auth controller) const refreshToken = crypto.randomBytes(64).toString('hex'); const refreshTokenHash = crypto .createHash('sha256') .update(refreshToken) .digest('hex'); const expiresAt = new Date(Date.now() + 7 * 86400000); // 7 days const session = await this.sessionService.createSession({ userId, tenantId, refreshTokenHash, deviceId: context.fingerprint ? this.deviceTrust.generateDeviceId(context.fingerprint) : undefined, browser: context.userAgent ? this.extractBrowser(context.userAgent) : undefined, ipAddress: context.ipAddress, loginMethod: provider, expiresAt, }); // Store the refresh token for existing auth flow compatibility await this.refreshTokenModel.create({ token: refreshToken, userId, expiresAt, isRevoked: false, }); await this.eventBus.publish( 'platform.identity.social_login.success.v1', { userId, tenantId, provider, isNewUser, }, tenantId, ); return { user: { id: userId, email: user.email, firstName: user.firstName, lastName: user.lastName, avatar: user.avatar, roles: user.roles, }, refreshToken, sessionId: session.sessionId, mfaRequired: false, isNewUser, }; } /** * Records a login attempt. */ private async recordLoginAttempt(data: Partial<LoginAttempt>): Promise<void> { try { await this.loginAttemptModel.create(data); } catch (err) { this.logger.error(`Failed to record login attempt: ${err.message}`); } } private extractBrowser(userAgent?: string): string | undefined { if (!userAgent) return undefined; if (userAgent.includes('Chrome') && !userAgent.includes('Edg')) return 'Chrome'; if (userAgent.includes('Safari') && !userAgent.includes('Chrome')) return 'Safari'; if (userAgent.includes('Firefox')) return 'Firefox'; if (userAgent.includes('Edg')) return 'Edge'; return 'Other'; } } |