image-uploader.html

<template name="imageUploader">
  <h2>Picture</h2>
  <p>
  {{#each images}}
          <img src="{{url}}" alt="">
          <input type="button" value="remove" class="btnRemove"/>
      {{else}}
          No files uploaded.
  {{/each}}
  </p>
  <p>Upload profile pic:</p>
  <input name="files" id="files" type="file" multiple/><br/>
  <br/>
  <div id="dropzone" class="dropzone">
    <div style="text-align: center; color: gray;">Drop file to upload</div>
  </div>
  <br/>
</template>

image-uploader.js

// This should set default store to thumbnail store
// Setting the store on the client could change the way things get uploaded/downloaded in the future
// eg. the s3 allows direct upload and direct download - but for security we are going to add signed urls
// future package: cfs-s3cloud storage adapter
var imageStore = new FS.Store.FileSystem("thumbnail");

var images = new FS.Collection("images", {
    stores: [imageStore],
    filter: {
        allow: {
            contentTypes: ['image/*']
        }
    }
});

Meteor.subscribe("images");

var images = new FS.Collection("images", {
    stores: [imageStore],
    filter: {
        allow: {
            contentTypes: ['image/*']
        }
    }
});

Template.imageUploader.images = function () {
    return images.find();
};

Template.imageUploader.events({
    'change #files': function(event, temp) {
      console.log('files changed');
      FS.Utility.eachFile(event, function(file) {
        var fileObj = new FS.File(file);
        fileObj.metadata = { owner: Meteor.userId() };
        images.insert(fileObj);
      });
    },
    'dropped #dropzone': function(event, temp) {
      console.log('files droped');
      FS.Utility.eachFile(event, function(file) {
        var fileObj = new FS.File(file);
        fileObj.metadata = { owner: Meteor.userId() };
        images.insert(fileObj);
      });
    },
    'click .btnRemove': function(event, temp) {
      this.remove();
    }
});

server.js

var imageStore = new FS.Store.S3("images", {
    region: "us-east-1",
    accessKeyId: "***********", 
    secretAccessKey: "*********", 
    bucket: "*******"
});

var gridfs = new FS.Store.GridFS('gridfsimages', {
    transformWrite: function(fileObj, readStream, writeStream) {
        // Store 10x10 px images
        this.gm(readStream, fileObj.name).resize('10', '10').stream().pipe(writeStream);
        // To pass through stream:
        //readStream.pipe(writeStream);
    }     
});

var thumbnail = new FS.Store.FileSystem('thumbnail', {
    path: '~/dev/test/collectionFS/thumbnails',
    transformWrite: function(fileObj, readStream, writeStream) {
        // Store 10x10 px images
        this.gm(readStream, fileObj.name).resize('10', '10').stream().pipe(writeStream);
        // To pass through stream:
        //readStream.pipe(writeStream);
    },
    // we support transformRead function too - its same layout as transformRead
    // and will transform data from the storage adapter to the reading stream.
    // eg. if we want to have encrypt and decrypt data streams
    // Node transform streams:
    // http://nodejs.org/api/zlib.html
    // http://nodejs.org/api/crypto.html
    // But its also possible to pipe data from other stores on to fileObj or other files
    // so data handling is flexible
    
});

// we place the thumbnail to be created first since we want the client to get a fast upload response
// 
var images = new FS.Collection("images", {
    stores: [thumbnail, gridfsimageStore, gridfs],
    filter: {
        allow: {
            contentTypes: ['image/*']
        }
    }
});

images.allow({
    insert: function(userId, fileObj) {
        return !!userId; // we could check fileObj.metadata.owner?
    },
    update: function(userId, fileObj) {
        return !!userId;
    },
    remove: function(userId, fileObj) {
        return !!userId;
    },
    // Allow eg. only the user in metadata
    // the shareId is being discussed - eg. for sharing urls
    download: function(userId, fileObj/*, shareId*/) {
        return true;
    },
    fetch: []
});

// Publish images with userId in owner - this regulates reading the
// filerecord data - use allow/deny for "download" for restricting the
// access to the actual data.
Meteor.publish("images", function() {
    return images.find({ 'metadata.owner': this.userId });
});