HIPAA-Compliant Email Communication:
How Email Validation Saves Lives

// HIPAA-compliant email validation implementation
import { createHmac } from 'crypto';

class HealthcareEmailValidator {
  constructor(apiKey, baaToken) {
    this.apiKey = apiKey;
    this.baaToken = baaToken;
    this.baseUrl = 'https://api.email-check.app';
  }

  // Encrypt PHI before validation
  encryptEmail(email, patientId) {
    const timestamp = Date.now().toString();
    const payload = `${email}|${patientId}|${timestamp}`;

    return createHmac('sha256', this.baaToken)
      .update(payload)
      .digest('hex');
  }

  async validatePatientEmail(email, patientId, validationType = 'standard') {
    try {
      // Create audit log entry
      const auditId = await this.createAuditLog({
        patientId: patientId,
        timestamp: new Date().toISOString(),
        action: 'email_validation_initiated',
        validationType: validationType
      });

      const encryptedPayload = this.encryptEmail(email, patientId);

      const response = await fetch(`${this.baseUrl}/v1/healthcare-email-validation`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${this.apiKey}`,
          'X-HIPAA-BAA': this.baaToken,
          'X-Audit-ID': auditId,
          'X-Validation-Type': validationType
        },
        body: JSON.stringify({
          encryptedPayload: encryptedPayload,
          patientId: patientId,
          validationLevel: 'hipaa_compliant',
          includeRiskScoring: true,
          healthcareDomain: true
        })
      });

      const result = await response.json();

      // Update audit log with results
      await this.updateAuditLog(auditId, {
        validationResult: result.isValid,
        riskScore: result.riskScore,
        completionTime: new Date().toISOString()
      });

      return {
        isValid: result.isValid,
        riskScore: result.riskScore,
        suggestions: result.suggestions,
        auditId: auditId
      };

    } catch (error) {
      await this.logSecurityIncident({
        patientId: patientId,
        error: error.message,
        timestamp: new Date().toISOString()
      });
      throw new Error('Validation failed - security incident logged');
    }
  }

  async createAuditLog(entry) {
    // Implementation for HIPAA audit logging
    const auditId = `audit_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;

    // Store in secure, encrypted audit system
    await this.secureStorage.store(`audit:${auditId}`, {
      ...entry,
      auditId: auditId
    });

    return auditId;
  }
}

// Usage in patient registration system
const validator = new HealthcareEmailValidator(
  process.env.HIPAA_API_KEY,
  process.env.BAA_TOKEN
);

async function validatePatientRegistration(patientData) {
  const validation = await validator.validatePatientEmail(
    patientData.email,
    patientData.id,
    'patient_registration'
  );

  if (!validation.isValid) {
    // Alert clinical staff about potential communication issues
    await notifyClinicalStaff({
      patientId: patientData.id,
      issue: 'invalid_email',
      riskLevel: validation.riskScore > 0.7 ? 'high' : 'medium',
      auditId: validation.auditId
    });
  }

  return validation;
}