fileFactory() added

lib/fileFactory.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const fs = require('fs-extra');
+const streamifier = require('streamifier');
+const md5 = require('md5');
+
+module.exports = function(options) {
+  return {
+    name: options.name,
+    data: options.buffer,
+    encoding: options.encoding,
+    truncated: options.truncated,
+    mimetype: options.mimetype,
+    md5: md5(options.buffer),
+    mv: function(path, callback) {
+      // Callback is passed in, use the callback API
+      if (callback) {
+        doMove(
+          () => {
+            callback(null);
+          },
+          (error) => {
+            callback(error);
+          }
+        );
+
+      // Otherwise, return a promise
+      } else {
+        return new Promise((resolve, reject) => {
+          doMove(resolve, reject);
+        });
+      }
+
+      /**
+       * Local function that moves the file to a different location on the filesystem
+       * Takes two function arguments to make it compatible w/ Promise or Callback APIs
+       * @param {Function} successFunc
+       * @param {Function} errorFunc
+       */
+      function doMove(successFunc, errorFunc) {
+        const fstream = fs.createWriteStream(path);
+
+        streamifier.createReadStream(options.buffer).pipe(fstream);
+
+        fstream.on('error', function(error) {
+          errorFunc(error);
+        });
+
+        fstream.on('close', function() {
+          successFunc();
+        });
+      }
+    }
+  };
+};

test/fileFactory.spec.js

@@ -0,0 +1,78 @@
+'use strict';
+
+const assert = require('assert');
+const fs = require('fs');
+const md5 = require('md5');
+const path = require('path');
+const fileFactory = require('../lib/fileFactory');
+const server = require('./server');
+
+const mockBuffer = fs.readFileSync(path.join(server.fileDir, 'basketball.png'));
+
+describe('Test of the fileFactory factory', function() {
+  beforeEach(function() {
+    server.clearUploadsDir();
+  });
+
+  it('return a file object', function() {
+    assert.ok(fileFactory({
+      name: 'basketball.png',
+      buffer: mockBuffer
+    }));
+  });
+
+  describe('File object behavior', function() {
+    const file = fileFactory({
+      name: 'basketball.png',
+      buffer: mockBuffer
+    });
+    it('move the file to the specified folder', function(done) {
+      file.mv(path.join(server.uploadDir, 'basketball.png'), function(err) {
+        assert.ifError(err);
+        done();
+      });
+    });
+    it('reject the mv if the destination does not exists', function(done) {
+      file.mv(path.join(server.uploadDir, 'unknown', 'basketball.png'), function(err) {
+        assert.ok(err);
+        done();
+      });
+    });
+  });
+
+  describe('Properties', function() {
+    it('contains the name property', function() {
+      assert.equal(fileFactory({
+        name: 'basketball.png',
+        buffer: mockBuffer
+      }).name, 'basketball.png');
+    });
+    it('contains the data property', function() {
+      assert.ok(fileFactory({
+        name: 'basketball.png',
+        buffer: mockBuffer
+      }).data);
+    });
+    it('contains the encoding property', function() {
+      assert.equal(fileFactory({
+        name: 'basketball.png',
+        buffer: mockBuffer,
+        encoding: 'utf-8'
+      }).encoding, 'utf-8');
+    });
+    it('contains the mimetype property', function() {
+      assert.equal(fileFactory({
+        name: 'basketball.png',
+        buffer: mockBuffer,
+        mimetype: 'image/png'
+      }).mimetype, 'image/png');
+    });
+    it('contains the md5 property', function() {
+      const mockMd5 = md5(mockBuffer);
+      assert.equal(fileFactory({
+        name: 'basketball.png',
+        buffer: mockBuffer
+      }).md5, mockMd5);
+    });
+  });
+});