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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
#!/usr/bin/env ruby
require 'bundler/inline'
gemfile do
source 'https://rubygems.org'
gem "csv", "~> 3.0"
gem "declarative_policy", "~> 1.0"
gem "erb", "~> 4.0"
gem "globalid", "~> 1.0"
gem "google-protobuf", "~> 3.0"
gem "json", "~> 2.0"
gem "logger", "~> 1.0"
gem "rack", "~> 3.0"
gem "rackup", "~> 2.0"
gem "securerandom", "~> 0.1"
gem "twirp", "~> 1.0"
gem "webrick", "~> 1.0"
end
lib_path = Pathname.new(__FILE__).parent.parent.join('lib').realpath.to_s
$LOAD_PATH.unshift(lib_path) unless $LOAD_PATH.include?(lib_path)
require 'authx/rpc'
$scheme = ENV.fetch("SCHEME", "http")
$port = ENV.fetch("PORT", 8284).to_i
$host = ENV.fetch("HOST", "localhost:#{$port}")
class Entity
class << self
def all
@items ||= ::CSV.read(File.join(__dir__, "../db/#{self.name.downcase}s.csv"), headers: true).map do |row|
new(row.to_h.transform_keys(&:to_sym))
end
end
def create!(attributes)
new({ id: SecureRandom.uuid }.merge(attributes)).tap do |item|
all << item
end
end
end
def initialize(attributes = {})
@attributes = attributes
end
def id
self[:id]
end
def [](attribute)
@attributes.fetch(attribute.to_sym)
end
def to_h
@attributes
end
def to_gid
::GlobalID.create(self, app: "example")
end
end
class Organization < Entity
class << self
def default
@default ||= create!(id: SecureRandom.uuid)
end
end
end
class Project < Entity
end
module HTTPHelpers
def authorized?(request, permission, resource)
authorization = Rack::Auth::AbstractRequest.new(request.env)
return false unless authorization.provided?
response = rpc.allowed({
subject: authorization.params,
permission: permission,
resource: resource.to_gid.to_s,
}, headers: { 'Authorization' => "Bearer #{authorization.params}"})
response.error.nil? && response.data.result
end
def json_not_found
http_response(code: 404)
end
def json_ok(body)
http_response(code: 200, body: JSON.pretty_generate(body))
end
def json_created(body)
http_response(code: 201, body: JSON.pretty_generate(body.to_h))
end
def json_unauthorized(permission, resource)
http_response(code: 401, body: JSON.pretty_generate({
error: {
code: 401,
message: "`#{permission}` is required on `#{resource.to_gid}`",
}
}))
end
def http_response(code:, headers: { 'Content-Type' => 'application/json' }, body: nil)
[
code,
headers.merge({ 'X-Backend-Server' => 'REST' }),
[body].compact
]
end
end
class API
include HTTPHelpers
attr_reader :rpc
def initialize
@rpc = ::Authx::Rpc::AbilityClient.new("http://idp.example.com:8080/twirp")
end
def call(env)
request = Rack::Request.new(env)
case request.request_method
when Rack::GET
case request.path
when "/organizations", "/organizations.json"
return json_ok(Organization.all.map(&:to_h))
when "/projects", "/projects.json"
resource = Organization.default
if authorized?(request, :read_project, resource)
return json_ok(Project.all.map(&:to_h))
else
return json_unauthorized(:read_project, resource)
end
end
when Rack::POST
case request.path
when "/projects", "/projects.json"
resource = Organization.default
if authorized?(request, :create_project, resource)
return json_created(Project.create!(JSON.parse(request.body.read, symbolize_names: true)))
else
return json_unauthorized(:create_project, resource)
end
end
end
json_not_found
end
private
end
if __FILE__ == $0
app = Rack::Builder.new do
use Rack::CommonLogger
use Rack::Reloader
run API.new
end.to_app
Rackup::Server.start(app: app, Port: $port)
end
|
