Initial commit: teaching institution management API.

Express/MongoDB backend with JWT auth, RBAC, S3 uploads, notifications, and scheduled jobs.

components/certificates/certificateService.js

@@ -0,0 +1,181 @@
+// /components/certificates/certificateService.js
+
+const path = require('path');
+const Certificate = require('./certificateModel');
+const User = require('../users/userModel');
+const AppError = require('../../utils/AppError');
+const { commitTempFile, generatePresignedUrl, deleteFromBucket } = require('../../utils/s3Client');
+const eventEmitter = require('../../events/eventEmitter');
+const EVENT_NAMES = require('../../constants/eventNames');
+const { parsePaginationAndSort, buildFilterQuery, calculateMeta } = require('../../utils/pagination');
+
+const createCertificate = async (data) => {
+  const user = await User.findById(data.user);
+  if (!user) throw new AppError('USER_NOT_FOUND');
+
+  // Move file from Temp bucket to Permanent Storage bucket
+  const targetKey = `certificates/cert-${Date.now()}-${path.basename(data.tempFileName)}`;
+  const { fileKey } = await commitTempFile(data.tempFileName, targetKey);
+
+  const certificate = await Certificate.create({
+    user: data.user,
+    course: data.course || null,
+    title: data.title,
+    issuer: data.issuer || '',
+    fileKey,
+    originalName: data.originalName || path.basename(data.tempFileName),
+    isOfficial: data.isOfficial || false
+  });
+
+  user.certificates.push(certificate._id);
+  await user.save();
+
+  eventEmitter.emit(EVENT_NAMES.CERTIFICATE_ISSUED, { certificateId: certificate._id, userId: user._id });
+
+  const resultObj = certificate.toObject();
+  resultObj.presignedUrl = await generatePresignedUrl(certificate.fileKey);
+  return resultObj;
+};
+
+const getCertificateById = async (id) => {
+  const certificate = await Certificate.findById(id)
+    .populate('user', 'name surname username nationalIdCode')
+    .populate('course', 'title type');
+  if (!certificate) {
+    throw new AppError('CERTIFICATE_NOT_FOUND');
+  }
+
+  const resultObj = certificate.toObject();
+  resultObj.presignedUrl = await generatePresignedUrl(certificate.fileKey);
+  return resultObj;
+};
+
+const getAllCertificates = async (queryParams) => {
+  const { page, limit, skip, sort } = parsePaginationAndSort(queryParams);
+  const filter = buildFilterQuery(queryParams, ['title', 'issuer']);
+
+  const [certificates, totalCount] = await Promise.all([
+    Certificate.find(filter)
+      .populate('user', 'name surname username')
+      .populate('course', 'title')
+      .sort(sort)
+      .skip(skip)
+      .limit(limit),
+    Certificate.countDocuments(filter)
+  ]);
+
+  const listWithUrls = await Promise.all(
+    certificates.map(async (cert) => {
+      const item = cert.toObject();
+      item.presignedUrl = await generatePresignedUrl(cert.fileKey);
+      return item;
+    })
+  );
+
+  const meta = calculateMeta(totalCount, page, limit);
+  return { data: listWithUrls, meta };
+};
+
+const updateCertificate = async (id, updateData) => {
+  const certificate = await Certificate.findById(id);
+  if (!certificate) {
+    throw new AppError('CERTIFICATE_NOT_FOUND');
+  }
+
+  if (updateData.tempFileName) {
+    const targetKey = `certificates/cert-${Date.now()}-${path.basename(updateData.tempFileName)}`;
+    const { fileKey } = await commitTempFile(updateData.tempFileName, targetKey);
+    // Delete old file from storage bucket
+    await deleteFromBucket(certificate.fileKey);
+    certificate.fileKey = fileKey;
+  }
+
+  if (updateData.title) certificate.title = updateData.title;
+  if (updateData.issuer !== undefined) certificate.issuer = updateData.issuer;
+  if (updateData.isOfficial !== undefined) certificate.isOfficial = updateData.isOfficial;
+
+  await certificate.save();
+
+  const resultObj = certificate.toObject();
+  resultObj.presignedUrl = await generatePresignedUrl(certificate.fileKey);
+  return resultObj;
+};
+
+const deleteCertificate = async (id) => {
+  const certificate = await Certificate.findById(id);
+  if (!certificate) {
+    throw new AppError('CERTIFICATE_NOT_FOUND');
+  }
+
+  await deleteFromBucket(certificate.fileKey);
+  await User.findByIdAndUpdate(certificate.user, { $pull: { certificates: certificate._id } });
+  await Certificate.findByIdAndDelete(id);
+  return null;
+};
+
+const searchCertificates = async (queryParams) => {
+  return getAllCertificates(queryParams);
+};
+
+const uploadUserCertificate = async (userId, data) => {
+  const user = await User.findById(userId);
+  if (!user) throw new AppError('USER_NOT_FOUND');
+
+  const targetKey = `certificates/cert-${Date.now()}-${path.basename(data.tempFileName)}`;
+  const { fileKey } = await commitTempFile(data.tempFileName, targetKey);
+
+  const certificate = await Certificate.create({
+    user: userId,
+    course: data.course || null,
+    title: data.title,
+    issuer: data.issuer || 'Self-Uploaded',
+    fileKey,
+    originalName: data.originalName || path.basename(data.tempFileName),
+    isOfficial: false
+  });
+
+  user.certificates.push(certificate._id);
+  await user.save();
+
+  eventEmitter.emit(EVENT_NAMES.CERTIFICATE_UPLOADED, { certificateId: certificate._id, userId });
+
+  const resultObj = certificate.toObject();
+  resultObj.presignedUrl = await generatePresignedUrl(certificate.fileKey);
+  return resultObj;
+};
+
+const getMyCertificates = async (userId, queryParams) => {
+  const filter = { user: userId, ...buildFilterQuery(queryParams) };
+  const { page, limit, skip, sort } = parsePaginationAndSort(queryParams);
+
+  const [certificates, totalCount] = await Promise.all([
+    Certificate.find(filter)
+      .populate('course', 'title type')
+      .sort(sort)
+      .skip(skip)
+      .limit(limit),
+    Certificate.countDocuments(filter)
+  ]);
+
+  const listWithUrls = await Promise.all(
+    certificates.map(async (cert) => {
+      const item = cert.toObject();
+      item.presignedUrl = await generatePresignedUrl(cert.fileKey);
+      return item;
+    })
+  );
+
+  const meta = calculateMeta(totalCount, page, limit);
+  return { data: listWithUrls, meta };
+};
+
+module.exports = {
+  createCertificate,
+  getCertificateById,
+  getAllCertificates,
+  updateCertificate,
+  deleteCertificate,
+  searchCertificates,
+  uploadUserCertificate,
+  getMyCertificates
+};