Class: S3DirectUpload::UploadHelper::S3Uploader

Inherits:
Object
  • Object
show all
Defined in:
lib/s3_direct_upload/form_helper.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ S3Uploader

Returns a new instance of S3Uploader.



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# File 'lib/s3_direct_upload/form_helper.rb', line 13

def initialize(options)
  @key_starts_with = options[:key_starts_with] || "uploads/"
  @options = options.reverse_merge(
    aws_access_key_id: S3DirectUpload.config.access_key_id,
    aws_secret_access_key: S3DirectUpload.config.secret_access_key,
    bucket: S3DirectUpload.config.bucket,
    region: S3DirectUpload.config.region || "s3",
    url: S3DirectUpload.config.url,
    ssl: true,
    acl: "public-read",
    expiration: 10.hours.from_now.utc.iso8601,
    max_file_size: 500.megabytes,
    callback_method: "POST",
    callback_param: "file",
    key_starts_with: @key_starts_with,
    key: key
  )
end

Instance Method Details

#fields ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 47

def fields
  {
    :key => @options[:key] || key,
    :acl => @options[:acl],
    "AWSAccessKeyId" => @options[:aws_access_key_id],
    :policy => policy,
    :signature => signature,
    :success_action_status => "201",
    'X-Requested-With' => 'xhr'
  }
end

#form_options ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 32

def form_options
  {
    id: @options[:id],
    class: @options[:class],
    method: "post",
    authenticity_token: false,
    multipart: true,
    data: {
      callback_url: @options[:callback_url],
      callback_method: @options[:callback_method],
      callback_param: @options[:callback_param]
    }.reverse_merge(@options[:data] || {})
  }
end

#key ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 59

def key
  @key ||= "#{@key_starts_with}{timestamp}-{unique_id}-#{SecureRandom.hex}/${filename}"
end

#policy ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 67

def policy
  Base64.encode64(policy_data.to_json).gsub("\n", "")
end

#policy_data ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 71

def policy_data
  {
    expiration: @options[:expiration],
    conditions: [
      ["starts-with", "$utf8", ""],
      ["starts-with", "$key", @options[:key_starts_with]],
      ["starts-with", "$x-requested-with", ""],
      ["content-length-range", 0, @options[:max_file_size]],
      ["starts-with","$content-type",""],
      {bucket: @options[:bucket]},
      {acl: @options[:acl]},
      {success_action_status: "201"}
    ] + (@options[:conditions] || [])
  }
end

#signature ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 87

def signature
  Base64.encode64(
    OpenSSL::HMAC.digest(
      OpenSSL::Digest::Digest.new('sha1'),
      @options[:aws_secret_access_key], policy
    )
  ).gsub("\n", "")
end

#url ⇒ Object 



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# File 'lib/s3_direct_upload/form_helper.rb', line 63

def url
  @options[:url] || "http#{@options[:ssl] ? 's' : ''}://#{@options[:region]}.amazonaws.com/#{@options[:bucket]}/"
end