1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
# frozen_string_literal: true
gem "google-cloud-storage", "~> 1.11"
require "google/cloud/storage"
module ActiveStorage
# Wraps the Google Cloud Storage as an Active Storage service. See ActiveStorage::Service for the generic API
# documentation that applies to all services.
class Service::GCSService < Service
def initialize(**config)
@config = config
end
def upload(key, io, checksum: nil, content_type: nil, disposition: nil, filename: nil)
instrument :upload, key: key, checksum: checksum do
# GCS's signed URLs don't include params such as response-content-type response-content_disposition
# in the signature, which means an attacker can modify them and bypass our effort to force these to
# binary and attachment when the file's content type requires it. The only way to force them is to
# store them as object's metadata.
content_disposition = content_disposition_with(type: disposition, filename: filename) if disposition && filename
bucket.create_file(io, key, md5: checksum, content_type: content_type, content_disposition: content_disposition)
rescue Google::Cloud::InvalidArgumentError
raise ActiveStorage::IntegrityError
end
end
def download(key, &block)
if block_given?
instrument :streaming_download, key: key do
stream(key, &block)
end
else
instrument :download, key: key do
file_for(key).download.string
rescue Google::Cloud::NotFoundError
raise ActiveStorage::FileNotFoundError
end
end
end
def update_metadata(key, content_type:, disposition: nil, filename: nil)
instrument :update_metadata, key: key, content_type: content_type, disposition: disposition do
file_for(key).update do |file|
file.content_type = content_type
file.content_disposition = content_disposition_with(type: disposition, filename: filename) if disposition && filename
end
end
end
def download_chunk(key, range)
instrument :download_chunk, key: key, range: range do
file_for(key).download(range: range).string
rescue Google::Cloud::NotFoundError
raise ActiveStorage::FileNotFoundError
end
end
def delete(key)
instrument :delete, key: key do
file_for(key).delete
rescue Google::Cloud::NotFoundError
# Ignore files already deleted
end
end
def delete_prefixed(prefix)
instrument :delete_prefixed, prefix: prefix do
bucket.files(prefix: prefix).all do |file|
file.delete
rescue Google::Cloud::NotFoundError
# Ignore concurrently-deleted files
end
end
end
def exist?(key)
instrument :exist, key: key do |payload|
answer = file_for(key).exists?
payload[:exist] = answer
answer
end
end
def url(key, expires_in:, filename:, content_type:, disposition:)
instrument :url, key: key do |payload|
generated_url = file_for(key).signed_url expires: expires_in, query: {
"response-content-disposition" => content_disposition_with(type: disposition, filename: filename),
"response-content-type" => content_type
}
payload[:url] = generated_url
generated_url
end
end
def url_for_direct_upload(key, expires_in:, checksum:, **)
instrument :url, key: key do |payload|
generated_url = bucket.signed_url key, method: "PUT", expires: expires_in, content_md5: checksum
payload[:url] = generated_url
generated_url
end
end
def headers_for_direct_upload(key, checksum:, **)
{ "Content-MD5" => checksum }
end
private
attr_reader :config
def file_for(key, skip_lookup: true)
bucket.file(key, skip_lookup: skip_lookup)
end
# Reads the file for the given key in chunks, yielding each to the block.
def stream(key)
file = file_for(key, skip_lookup: false)
chunk_size = 5.megabytes
offset = 0
raise ActiveStorage::FileNotFoundError unless file.present?
while offset < file.size
yield file.download(range: offset..(offset + chunk_size - 1)).string
offset += chunk_size
end
end
def bucket
@bucket ||= client.bucket(config.fetch(:bucket), skip_lookup: true)
end
def client
@client ||= Google::Cloud::Storage.new(config.except(:bucket))
end
end
end
|
