Class: UniversalS3Uploader::ViewHelper::UploaderHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/universal_s3_uploader/view_helper.rb

Instance Method Summary collapse

Constructor Details

#initialize(policy_name) ⇒ UploaderHelper

Returns a new instance of UploaderHelper.



10
11
12
13
14
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 10

def initialize(policy_name)
	@config = YAML.load_file("#{Rails.root.to_s}/config/amazon.yml")
	set_policy(policy_name)
	set_bucket
end

Instance Method Details

#bucket ⇒ Object 



70
71
72
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 70

def bucket
	@bucket
end

#div_tag(name, value) ⇒ Object 



40
41
42
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 40

def div_tag(name, value)
	"<div class='#{name}' data-value='#{value}'></div>"
end

#policy_encoded ⇒ Object 



78
79
80
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 78

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

#set_bucket ⇒ Object

extract bucket name



26
27
28
29
30
31
32
33
34
35
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 26

def set_bucket
	@policy['conditions'].each do |condition|
		if condition.class == Hash && condition.keys.first == 'bucket'
			@bucket = condition.values.first
			return
		end
	end

	raise 'No bucket name in policy Exception'
end

#set_policy(policy_name) ⇒ Object

set expiration time



17
18
19
20
21
22
23
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 17

def set_policy(policy_name)
	@policy = @config[policy_name]
	@policy['conditions'] << ["starts-with", "$Filename", ""]	# for Flash upload
	if @policy['expiration'] == '' || @policy['expiration'].nil?
		@policy['expiration'] = 1.hour.from_now.gmtime.iso8601
	end
end

#signature ⇒ Object 



82
83
84
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 82

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

#tags(key, id) ⇒ Object 



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 37

def tags(key, id)
	av = ActionView::Base.new

	def div_tag(name, value)
		"<div class='#{name}' data-value='#{value}'></div>"
	end

	tag = "<div class='universal_s3_uploader' id='#{id}' action='#{url}'>"

	([{key: key}] + @policy['conditions']).each do |condition|
		if condition.class == Hash
			tag += div_tag condition.keys.first, condition.values.first
		elsif condition.class == Array
			if condition[0] == 'eq' || condition[0] == 'starts-with'
				tag += div_tag condition[1][1..-1], condition[2] unless condition[1] == '$key'
			end
		else
			raise 'Something in policy unexpected'
		end
	end
	tag += div_tag 'AWSAccessKeyId', @config['access_key_id']
	tag += div_tag 'Policy', policy_encoded
	tag += div_tag 'Signature', signature
	tag += av.file_field_tag :file, multiple: true, accept: 'image/*'

	object_id = 'flash_' + id
	tag += "<object id=#{'flash_' + id} class='flash_uploader' classid='clsid:d27cdb6e-ae6d-11cf-96b8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=11,1,0,0'>"
	tag += '<param name="movie" value="/assets/UniversalS3Uploader.swf">'
	tag += '<param name="wmode" value="transparent">'
	tag += '</object>'
	tag += '</div>'
end

#url ⇒ Object 



74
75
76
 
# File 'lib/universal_s3_uploader/view_helper.rb', line 74

def url
	"http://#{@bucket}.s3.amazonaws.com"
end