/shrimp

a phantomjs based pdf renderer

Primary LanguageRubyMIT LicenseMIT

Shrimp

Build Status Creates PDFs from URLs using phantomjs

Read our blogpost about how it works.

Installation

Add this line to your application's Gemfile:

gem 'shrimp'

And then execute:

$ bundle

Or install it yourself as:

$ gem install shrimp

Phantomjs

See http://phantomjs.org/download.html on how to install phantomjs

Usage

require 'shrimp'
url     = 'http://www.google.com'
options = { :margin => "1cm"}
Shrimp::Phantom.new(url, options).to_pdf("~/output.pdf")

Configuration

Shrimp.configure do |config|

  # The path to the phantomjs executable
  # defaults to `where phantomjs`
  # config.phantomjs = '/usr/local/bin/phantomjs'

  # the default pdf output format
  # e.g. "5in*7.5in", "10cm*20cm", "A4", "Letter"
  # config.format           = 'A4'

  # the default margin
  # config.margin           = '1cm'

  # the zoom factor
  # config.zoom             = 1

  # the page orientation 'portrait' or 'landscape'
  # config.orientation      = 'portrait'

  # a temporary dir used to store tempfiles
  # config.tmpdir           = Dir.tmpdir

  # the default rendering time in ms
  # increase if you need to render very complex pages
  # config.rendering_time   = 1000

  # change the viewport size.  If you rendering pages that have 
  # flexible page width and height then you may need to set this
  # to enforce a specific size
  # config.viewport_width = 600 
  # config.viewport_height = 600

  # the timeout for the phantomjs rendering process in ms
  # this needs always to be higher than rendering_time
  # config.rendering_timeout       = 90000

  # the path to a json configuration file for command-line options
  # config.command_config_file = "#{Rails.root.join('config', 'shrimp', 'config.json')}"
end

Command Configuration

{
    "diskCache": false,
    "ignoreSslErrors": false,
    "loadImages": true,
    "outputEncoding": "utf8",
    "webSecurity": true
}

Middleware

Shrimp comes with a middleware that allows users to get a PDF view of any page on your site by appending .pdf to the URL.

Middleware Setup

Non-Rails Rack apps

# in config.ru
require 'shrimp'
use Shrimp::Middleware

Rails apps

# in application.rb(Rails3) or environment.rb(Rails2)
require 'shrimp'
config.middleware.use Shrimp::Middleware

With Shrimp options

# options will be passed to Shrimp::Phantom.new
config.middleware.use Shrimp::Middleware, :margin => '0.5cm', :format => 'Letter'

With conditions to limit routes that can be generated in pdf

# conditions can be regexps (either one or an array)
config.middleware.use Shrimp::Middleware, {}, :only => %r[^/public]
config.middleware.use Shrimp::Middleware, {}, :only => [%r[^/invoice], %r[^/public]]

# conditions can be strings (either one or an array)
config.middleware.use Shrimp::Middleware, {}, :only => '/public'
config.middleware.use Shrimp::Middleware, {}, :only => ['/invoice', '/public']

# conditions can be regexps (either one or an array)
config.middleware.use Shrimp::Middleware, {}, :except => [%r[^/prawn], %r[^/secret]]

# conditions can be strings (either one or an array)
config.middleware.use Shrimp::Middleware, {}, :except => ['/secret']

Polling

To avoid deadlocks Shrimp::Middleware renders the pdf in a separate process retuning a 503 Retry-After response Header. you can setup the polling interval and the polling offset in seconds.

config.middleware.use Shrimp::Middleware, :polling_interval => 1, :polling_offset => 5

Caching

To avoid rendering the page on each request you can setup some the cache ttl in seconds

config.middleware.use Shrimp::Middleware, :cache_ttl => 3600, :out_path => "my/pdf/store"

Ajax requests

To include some fancy Ajax stuff with jquery

 var url = '/my_page.pdf'
 var statusCodes = {
      200: function() {
        return window.location.assign(url);
      },
      504: function() {
       console.log("Shit's beeing wired")
      },
      503: function(jqXHR, textStatus, errorThrown) {
        var wait;
        wait = parseInt(jqXHR.getResponseHeader('Retry-After'));
        return setTimeout(function() {
          return $.ajax({
            url: url,
            statusCode: statusCodes
          });
        }, wait * 1000);
      }
  }
  $.ajax({
    url: url,
    statusCode: statusCodes
  })

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

Copyright

Shrimp is Copyright © 2012 adeven (Manuel Kniep). It is free software, and may be redistributed under the terms specified in the LICENSE file.