add file download endpoint

Author: gondzo

src/permissions/index.js

@@ -19,5 +19,6 @@ module.exports = () => {
   Authorizer.setPolicy('project.addAttachment', projectEdit);
   Authorizer.setPolicy('project.updateAttachment', projectEdit);
   Authorizer.setPolicy('project.removeAttachment', projectEdit);
+  Authorizer.setPolicy('project.downloadAttachment', projectView);
   Authorizer.setPolicy('project.updateMember', projectEdit);
 };

src/routes/attachments/download.js

@@ -0,0 +1,46 @@
+
+import _ from 'lodash';
+import { middleware as tcMiddleware } from 'tc-core-library-js';
+import models from '../../models';
+import util from '../../util';
+
+/**
+ * API to download a project attachment.
+ *
+ */
+
+const permissions = tcMiddleware.permissions;
+
+module.exports = [
+  permissions('project.downloadAttachment'),
+  (req, res, next) => {
+    const projectId = _.parseInt(req.params.projectId);
+    const attachmentId = _.parseInt(req.params.id);
+
+    models.ProjectAttachment.findOne(
+      {
+        where: {
+          id: attachmentId,
+          projectId,
+        },
+      })
+    .then((attachment) => {
+      if (!attachment) {
+        const err = new Error('Record not found');
+        err.status = 404;
+        return Promise.reject(err);
+      }
+      return util.getFileDownloadUrl(req, attachment.filePath);
+    })
+    .then((result) => {
+      const url = result[1];
+      res.status(200).json(util.wrapResponse(req.id, { url }));
+    })
+    .catch((error) => {
+      req.log.error('Error fetching attachment', error);
+      const rerr = error;
+      rerr.status = rerr.status || 500;
+      next(rerr);
+    });
+  },
+];

src/routes/index.js

@@ -48,6 +48,7 @@ router.route('/v4/projects/:projectId(\\d+)/members/:id(\\d+)')
 router.route('/v4/projects/:projectId(\\d+)/attachments')
     .post(require('./attachments/create'));
 router.route('/v4/projects/:projectId(\\d+)/attachments/:id(\\d+)')
+    .get(require('./attachments/download'))
     .patch(require('./attachments/update'))
     .delete(require('./attachments/delete'));