mongoose-attachments: A JavaScript repository from cvd

What's mongoose-attachments?

Mongoose-Attachments is an attachments plugin for Mongoose.js. Supports Amazon S3 out-of-the-box and ImageMagick transformations styles.

Installation

$ npm install mongoose-attachments

Usage

The following example extens the 'Post' model to use attachments with a property called 'image' and three different styles.

var mongoose = require('mongoose');
var attachments = require('mongoose-attachments');
var PostSchema = new mongoose.Schema({
  title: String,
  description: String
});

PostSchema.plugin(attachments, {
  directory: 'achievements',
    storage: {
      providerName: 's3',
      options: {
      key: '<key>',
      secret: '<secret>',
      bucket: '<bucket>'
    }
  },
  properties: {
    image: {
      styles: {
        original: {
          // keep the original file
        },
        small: {
          resize: '150x150'
        },
        medium: {
          resize: '120x120'
        },
        medium_jpg: {
          '$format': 'jpg' // this one changes the format of the image to jpg
        }
      }
    }
  }
});

var Post = mongoose.model('Post', PostSchema);

Using with Express.js uploads

Assuming that the HTML form sent a file in a field called 'image':

app.post('/upload', function(req, res, next) {
  var post = new mongoose.model('Post')();
  post.title = req.body.title;
  post.description = req.body.description;
  post.attach('image', req.files.image, function(err) {	
    if(err) return next(err);
    post.save(function(err) {
      if(err) return next(err);
      res.send('Post has been saved with file!');
    });
  })	
});

Using with an stand-alone app files

var post = new mongoose.model('Post')();
post.title = 'Title of the Post';
post.description = 'Description of the Post';
post.attach('image', {
    path: '/path/to/the/file.png'
  }, function(err) {	
    if(err) return next(err);
    post.save(function(err) {
      if(err) return next(err);
      console.log('Post has been Saved with file');
    });
})

Metadata

When mongoose-attachments is used with images, it can provide basic information for each one of the specified styles:

Example:

{
  "dims" : {
    "w" : 120,
    "h" : 103
  },
  "depth" : 8,
  "format" : "PNG",
  "oname" : "dragon.png",
  "mtime" : ISODate("2012-05-22T06:21:53Z"),
  "ctime" : ISODate("2012-05-22T06:21:53Z"),
  "size" : 26887,
  "path" : "/achievements/4fbaaa31db8cec0923000019-medium.png",
  "defaultUrl" : "http://gamygame-dev.s3.amazonaws.com/achievements/4fbaaa31db8cec0923000019-medium.png"
}

Styles and ImageMagick Transformations

Transformations are achieved by invoking the convert command from ImageMagick and passing all the properties of the style as arguments.

For more information about convert, take a look at http://www.imagemagick.org/script/command-line-options.php

Example in convert command:

convert source.png -resize '50%' output.png

Example in plugin options:

styles: {
  small: {
    resize: '50%'
  }
}

Keeping the Original File

styles: {
  original: {
    // no transformations
  }
}

Multiples Transformations

Use another properties under the style to provide more transformations

styles: {
  small: {
    crop: '120x120',
    blur: '5x10' //radius x stigma
  }
}

More information about 'blur' at the [ImageMagick website] http://www.imagemagick.org/script/command-line-options.php#blur

Changing the Destination Format

You can change the destination format by using the special transformation '$format' with a known file extension like png, jpg, gif, etc.

Example:

styles: {
  as_jpeg: {
    '$format': 'jpg'
  }
}

Note: DO NOT include the dot in the extension.

License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

cvd/mongoose-attachments