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modules/images.js

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+const fs = require('fs');
+const ShortId = require('shortid');
+
+const ATTACHMENT_STORE = '../images';
+const ATTACHMENT_STORE_PROFILE = '/profile';
+const ATTACHMENT_STORE_MESSAGE = '/message';
+const ATTACHMENT_SUFFIX_DETAIL = '_detail';
+const ATTACHMENT_SUFFIX_THUMBNAIL = '_thumbnail';
+ 
+function generateFilename (filename, type = 'detail') {
+  var re = /(?:\.([^.]+))?$/;
+  var ext = re.exec(filename)[1];
+  return shortid.generate() + (type === 'thumbnail' ? ATTACHMENT_SUFFIX_THUMBNAIL : ATTACHMENT_SUFFIX_DETAIL) + "." + ext;
+}
+
+function processImage (data, context, type, callback) {
+  var folder = ATTACHMENT_STORE + (context === 'profile' ? ATTACHMENT_STORE_PROFILE : ATTACHMENT_STORE_MESSAGE);
+  var filename = generateFilename(data.imageFilename, type);
+
+  var data_url = data.image;
+  var matches = data_url.match(/^data:.+\/(.+);base64,(.*)$/);
+  var base64_data = matches[2];
+  var buffer = new Buffer(base64_data, 'base64');
+  
+  saveImage(folder + '/' + filename, buffer, callback);
+}
+
+function saveImage (filename, data, callback = function(){}) {
+  fs.writeFile(filename, data, function (err, stat) {
+    if (err) {
+      callback(err, null);
+    } else {
+      callback(null, filename.substring(2));
+    }
+  });
+}
+
+module.exports = {
+
+  save: (data, filename, callback = function(){}) {
+    saveImage(filename, data, callback);
+  },
+   
+  saveMessageImage: (data, callback) => {
+    processImage(data, 'message', 'detail', callback);
+  },
+  
+  saveProfileDetailImage: (data, callback) => {
+    processImage(data, 'profile', 'detail', callback);
+  },
+  
+  saveProfileThumbnailImage: (data, callback) => {
+    processImage(data, 'profile', 'thumbnail', callback);
+  }
+};
+