Sha256: fe5e898da0b0bdb110e0df5c3483e3fed38c7f3f1501f08928c989aac6308ac1
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Size: 1.26 KB
Versions: 63
Compression:
Stored size: 1.26 KB
Contents
require 'base64'
require 'openssl'
module FbGraph
class Auth
class SignedRequest
OAUTH_DIALOG_ENDPOINT = 'https://www.facebook.com/dialog/oauth'
def self.verify(client, signed_request)
signature, payload = signed_request.split('.')
raise VerificationFailed.new('No Signature') if signature.blank?
raise VerificationFailed.new('No Payload') if payload.blank?
signature = base64_url_decode signature
data = decode_json base64_url_decode(payload)
raise VerificationFailed.new('Unexpected Signature Algorithm') unless data[:algorithm] == 'HMAC-SHA256'
_signature_ = sign(client.secret, payload)
raise VerificationFailed.new('Signature Invalid') unless signature == _signature_
data
end
private
def self.sign(key, payload)
klass = OpenSSL::Digest::SHA256.new
OpenSSL::HMAC.digest(klass, key, payload)
end
def self.decode_json(json)
JSON.parse(json).with_indifferent_access
rescue => e
raise VerificationFailed.new('Invalid JSON')
end
def self.base64_url_decode(str)
str += '=' * (4 - str.length.modulo(4))
str = str.gsub('-', '+').gsub('_', '/')
Base64.decode64 str
end
end
end
end
Version data entries
63 entries across 63 versions & 1 rubygems