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BrowseEverything

This Gem allows your rails application to access user files from cloud storage. Currently there are drivers implemented for Dropbox, Google Drive, Box, Amazon S3, and a server-side directory share.

The gem uses OAuth to connect to a user's account and generate a list of single use urls that your application can then use to download the files.

This gem does not depend on hydra-head

Installation

Add this lines to your application's Gemfile:

gem 'jquery-rails'
gem 'browse-everything'

And then execute:

$ bundle

Or install it yourself as:

$ gem install browse-everything

Configuring the gem

After installing the gem, run the generator

$ rails g browse_everything:install

This generator will set up the config/browse_everything_providers.yml file and add the browse-everything engine to your application's routes.

If you prefer not to use the generator, or need info on how to set up providers in the browse_everything_providers.yml, use the info on Configuring browse-everything.

Include the CSS and JavaScript

Add @import "browse_everything"; to your application.css.scss

In app/assets/javascripts/application.js include jquery and the BrowseEverything

//= require jquery
//= require browse_everything

Usage

Adding Providers

In order to connect to a provider like Dropbox, Google Drive, or Box, you must provide API keys in config/browse_everything_providers.yml. For info on how to edit this file, see Configuring browse-everything

Views

browse-everything can be triggered in two ways -- either via data attributes in an HTML tag or via JavaScript. Either way, it accepts the same options:

Options

Name Type Default Description
route path (required) '' The base route of the browse-everything engine.
target xpath or jQuery null A form object to add the results to as hidden fields.
context text null App-specific context information (passed with each request)
accept MIME mask / A list of acceptable MIME types to browse (e.g., 'video/*')

If a target is provided, browse-everything will automatically convert the JSON response to a series of hidden form fields that can be posted back to Rails to re-create the array on the server side.

Via data attributes

To trigger browse-everything using data attributes, set the data-toggle attribute to "browse-everything" on the HTML tag. This tells the javascript where to attach the browse-everything behaviors. Pass in the options using the data-route and data-target attributes, as in data-target="#myForm".

For example:

<button type="button" data-toggle="browse-everything" data-route="<%=browse_everything_engine.root_path%>"
  data-target="#myForm" class="btn btn-large btn-success" id="browse">Browse!</button>

Via JavaScript

To trigger browse-everything via javascript, use the .browseEverything() method to attach the behaviors to DOM elements.

$('#browse').browseEverything(options)

The options argument should be a JSON object with the route and (optionally) target values set. For example:

$('#browse').browseEverything({
  route: "/browse",
  target: "#myForm"
})

See JavaScript Methods for more info on using javascript to trigger browse-everything.

The Results (Data Structure)

browse-everything returns a JSON data structure consisting of an array of URL specifications. Each URL specification is a plain object with the following properties:

Property Description
url The URL of the selected remote file.
auth_header Any headers that need to be added to the request in order to access the remote file.
expires The expiration date/time of the specified URL.
file_name The base name (filename.ext) of the selected file.

For example, after picking two files from dropbox,

If you initialized browse-everything via JavaScript, the results data passed to the .done() callback will look like this:

[
  {
    "url": "https://dl.dropbox.com/fake/filepicker-demo.txt.txt",
    "expires": "2014-03-31T20:37:36.214Z",
    "file_name": "filepicker-demo.txt.txt"
  }, {
    "url": "https://dl.dropbox.com/fake/Getting%20Started.pdf",
    "expires": "2014-03-31T20:37:36.731Z",
    "file_name": "Getting Started.pdf"
  }
]

See JavaScript Methods for more info on using javascript to trigger browse-everything.

If you initialized browse-everything via data-attributes and set the target option (via the data-target attribute or via the target option on the javascript method), the results data be written as hidden fields in the <form> you've specified as the target. When the user submits that form, the results will look like this:

"selected_files" => {
  "0"=>{
    "url"=>"https://dl.dropbox.com/fake/filepicker-demo.txt.txt",
    "expires"=>"2014-03-31T20:37:36.214Z",
    "file_name"=>"filepicker-demo.txt.txt"
  },
  "1"=>{
    "url"=>"https://dl.dropbox.com/fake/Getting%20Started.pdf",
    "expires"=>"2014-03-31T20:37:36.731Z",
    "file_name"=>"Getting Started.pdf"
  }
}

Retrieving Files

The BrowseEverything::Retriever class has two methods, #retrieve and #download, that can be used to retrieve selected content. #retrieve streams the file by yielding it, chunk by chunk, to a block, while #download saves it to a local file.

Given the above response data:

retriever = BrowseEverything::Retriever.new
download_spec = params['selected_files']['1']

# Retrieve the file, yielding each chunk to a block
retriever.retrieve(download_spec) do |chunk, retrieved, total|
  # do something with the `chunk` of data received, and/or
  # display some progress using `retrieved` and `total` bytes.
end

# Download the file. If `target_file` isn't specified, the
# retriever will create a tempfile and return the name.
retriever.download(download_spec, target_file) do |filename, retrieved, total|
  # The block is still useful for showing progress, but the
  # first argument is the filename instead of a chunk of data.
end

Examples

See spec/support/app/views/file_handler/index.html for an example use case. You can also run rake app:generate to create a fully-functioning demo app in spec/internal (though you will have to create spec/internal/config/browse_everything.providers.yml file with your own configuration info.)

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Help

For help with Browse Everything, contact samvera-tech@googlegroups.com.