Story 6: Digital Transfer Certificate

Overview

Field	Value
Story ID	NGE-13-6
Story Points	8
Sprint	Sprint 9

Technical Implementation

TC Generation with QR Verification

@Injectable()
export class TCService {
  async generateTC(studentId: string, dto: GenerateTCDto) {
    // Generate unique TC number
    const tcNumber = `TC/${year}/${String(count).padStart(5, '0')}`;
    
    // Generate verification code for QR
    const verificationCode = this.generateCode();
    const verifyUrl = `https://verify.edupulse.in/tc/${verificationCode}`;
    
    // Generate QR code
    const qrCode = await QRCode.toDataURL(verifyUrl);
    
    // Generate PDF with school letterhead
    const pdf = await this.pdfService.generateTC({
      student,
      tcNumber,
      qrCode,
      conduct: dto.conduct,
    });
    
    // Upload to S3
    await this.s3.upload({ key: `tc/${tcNumber}.pdf`, body: pdf });
    
    // Update student status
    await this.prisma.student.update({
      where: { id: studentId },
      data: { status: 'TRANSFERRED', tcNumber }
    });
    
    return { tcNumber, downloadUrl };
  }

  // Public verification endpoint
  async verifyTC(code: string) {
    const tc = await this.prisma.transferCertificate.findUnique({
      where: { verificationCode: code }
    });
    return tc ? { isValid: true, ...tc } : { isValid: false };
  }
}