1  const DAppImage = require('./../models/dapps-images-model');
 2  
 3  class DAppImageService {
 4  
 5      static async upload(req, image) {
 6          try {
 7              const uploadedImage = await DAppImage.create({ content: image });
 8              return buildImageUrl(req, uploadedImage.hash);
 9          } catch (error) {
10              // Code 11000 is because of uniqueness, so just return the already exist document
11              if (error.code == 11000) {
12                  const existingImage = await DAppImage.findByContent(image);
13                  return buildImageUrl(req, existingImage.hash);
14              }
15  
16              throw new Error(error.message);
17          }
18  
19      }
20  
21      static async retrieveImage(imageHash) {
22          return DAppImage.findOne({ 'hash': imageHash });
23      }
24  }
25  
26  const buildImageUrl = function (req, imageHash) {
27      return `/metadata/image/${imageHash}`;
28  }
29  
30  module.exports = DAppImageService;