discourse/lib/single_sign_on.rb

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class SingleSignOn
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ACCESSORS = [:nonce, :name, :username, :email,
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:about_me, :external_id]
FIXNUMS = []
NONCE_EXPIRY_TIME = 10.minutes
attr_accessor(*ACCESSORS)
attr_accessor :sso_secret, :sso_url
def self.sso_secret
raise RuntimeError, "sso_secret not implemented on class, be sure to set it on instance"
end
def self.sso_url
raise RuntimeError, "sso_url not implemented on class, be sure to set it on instance"
end
def self.parse(payload, sso_secret = nil)
sso = new
sso.sso_secret = sso_secret if sso_secret
parsed = Rack::Utils.parse_query(payload)
if sso.sign(parsed["sso"]) != parsed["sig"]
raise RuntimeError, "Bad signature for payload"
end
decoded = Base64.decode64(parsed["sso"])
decoded_hash = Rack::Utils.parse_query(decoded)
ACCESSORS.each do |k|
val = decoded_hash[k.to_s]
val = val.to_i if FIXNUMS.include? k
sso.send("#{k}=", val)
end
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decoded_hash.each do |k,v|
# 1234567
# custom.
#
if k[0..6] == "custom."
field = k[7..-1]
sso.custom_fields[field] = v
end
end
sso
end
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def sso_secret
@sso_secret || self.class.sso_secret
end
def sso_url
@sso_url || self.class.sso_url
end
def custom_fields
@custom_fields ||= {}
end
def sign(payload)
OpenSSL::HMAC.hexdigest("sha256", sso_secret, payload)
end
def to_url(base_url=nil)
base = "#{base_url || sso_url}"
"#{base}#{base.include?('?') ? '&' : '?'}#{payload}"
end
def payload
payload = Base64.encode64(unsigned_payload)
"sso=#{CGI::escape(payload)}&sig=#{sign(payload)}"
end
def unsigned_payload
payload = {}
ACCESSORS.each do |k|
next unless (val = send k)
payload[k] = val
end
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if @custom_fields
@custom_fields.each do |k,v|
payload["custom.#{k}"] = v.to_s
end
end
Rack::Utils.build_query(payload)
end
end