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class Session < ActiveRecord::Base
belongs_to :user
##
# Create a random remember token for the user. This will be
# changed every time the user creates a new session.
#
# If you want this value, hang on to it; the raw value is
# discarded afterward.
#
# By changing the cookie every new session, any hijacked sessions
# (where the attacker steals a cookie to sign in as a certain
# user) will expire the next time the user signs back in.
#
# The random string is of length 16 composed of A-Z, a-z, 0-9
# This is the browser's cookie value.
def create_token()
t = SecureRandom.urlsafe_base64
self.token = Session.hash_token(t)
t
end
##
# Encrypt the remember token.
# This is the encrypted version of the cookie stored on
# the database.
#
# The reasoning for storing a hashed token is so that even if
# the database is compromised, the attacker won't be able to use
# the remember tokens to sign in.
def Session.hash_token(token)
# SHA-1 (Secure Hash Algorithm) is a US engineered hash
# function that produces a 20 byte hash value which typically
# forms a hexadecimal number 40 digits long.
# The reason I am not using the Bcrypt algorithm is because
# SHA-1 is much faster and I will be calling this on
# every page a user accesses.
#
# https://en.wikipedia.org/wiki/SHA-1
Digest::SHA1.hexdigest(token.to_s)
end
end
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