erp-construccion/docs/02-definicion-modulos/MAE-016-gestion-documental/especificaciones/ET-DOC-004-servicio de firma electrónica.md

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# ET-DOC-004: Servicio de Firma Electrónica
**ID:** ET-DOC-004 | **Módulo:** MAE-016
## Signature Service
```typescript
@Injectable()
export class SignatureService {
async requestSignature(
documentId: string,
signerId: string,
type: 'simple' | 'advanced'
): Promise<SignatureRequest> {
const document = await this.documentRepo.findOne(documentId);
const signer = await this.userRepo.findOne(signerId);
if (type === 'simple') {
const otp = this.generateOTP();
await this.sendOTPEmail(signer.email, otp);
return { requestId: uuidv4(), otp, expiresAt: this.addMinutes(new Date(), 15) };
} else {
// FIEL (SAT) signature
return this.initializeFIELSignature(documentId, signerId);
}
}
async sign(
documentId: string,
signerId: string,
signatureData: string,
certificate?: string
): Promise<Signature> {
const signature = await this.signatureRepo.save({
documentId, signerId,
type: certificate ? 'advanced' : 'simple',
signatureData,
certificate,
signedAt: new Date()
});
// Embed signature in PDF
await this.embedSignatureInPDF(documentId, signature);
return signature;
}
}
```
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**Generado:** 2025-11-21