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|
require "rack/session/abstract/id"
module ActionDispatch
class Request
# Session is responsible for lazily loading the session from store.
class Session # :nodoc:
ENV_SESSION_KEY = Rack::RACK_SESSION # :nodoc:
ENV_SESSION_OPTIONS_KEY = Rack::RACK_SESSION_OPTIONS # :nodoc:
# Singleton object used to determine if an optional param wasn't specified
Unspecified = Object.new
# Creates a session hash, merging the properties of the previous session if any
def self.create(store, req, default_options)
session_was = find req
session = Request::Session.new(store, req)
session.merge! session_was if session_was
set(req, session)
Options.set(req, Request::Session::Options.new(store, default_options))
session
end
def self.find(req)
req.get_header ENV_SESSION_KEY
end
def self.set(req, session)
req.set_header ENV_SESSION_KEY, session
end
class Options #:nodoc:
def self.set(req, options)
req.set_header ENV_SESSION_OPTIONS_KEY, options
end
def self.find(req)
req.get_header ENV_SESSION_OPTIONS_KEY
end
def initialize(by, default_options)
@by = by
@delegate = default_options.dup
end
def [](key)
@delegate[key]
end
def id(req)
@delegate.fetch(:id) {
@by.send(:extract_session_id, req)
}
end
def []=(k,v); @delegate[k] = v; end
def to_hash; @delegate.dup; end
def values_at(*args); @delegate.values_at(*args); end
end
def initialize(by, req)
@by = by
@req = req
@delegate = {}
@loaded = false
@exists = nil # we haven't checked yet
end
def id
options.id(@req)
end
def options
Options.find @req
end
def destroy
clear
options = self.options || {}
@by.send(:delete_session, @req, options.id(@req), options)
# Load the new sid to be written with the response
@loaded = false
load_for_write!
end
# Returns value of the key stored in the session or
# nil if the given key is not found in the session.
def [](key)
load_for_read!
@delegate[key.to_s]
end
# Returns true if the session has the given key or false.
def has_key?(key)
load_for_read!
@delegate.key?(key.to_s)
end
alias :key? :has_key?
alias :include? :has_key?
# Returns keys of the session as Array.
def keys
@delegate.keys
end
# Returns values of the session as Array.
def values
@delegate.values
end
# Writes given value to given key of the session.
def []=(key, value)
load_for_write!
@delegate[key.to_s] = value
end
# Clears the session.
def clear
load_for_write!
@delegate.clear
end
# Returns the session as Hash.
def to_hash
load_for_read!
@delegate.dup.delete_if { |_,v| v.nil? }
end
# Updates the session with given Hash.
#
# session.to_hash
# # => {"session_id"=>"e29b9ea315edf98aad94cc78c34cc9b2"}
#
# session.update({ "foo" => "bar" })
# # => {"session_id"=>"e29b9ea315edf98aad94cc78c34cc9b2", "foo" => "bar"}
#
# session.to_hash
# # => {"session_id"=>"e29b9ea315edf98aad94cc78c34cc9b2", "foo" => "bar"}
def update(hash)
load_for_write!
@delegate.update stringify_keys(hash)
end
# Deletes given key from the session.
def delete(key)
load_for_write!
@delegate.delete key.to_s
end
# Returns value of the given key from the session, or raises +KeyError+
# if can't find the given key and no default value is set.
# Returns default value if specified.
#
# session.fetch(:foo)
# # => KeyError: key not found: "foo"
#
# session.fetch(:foo, :bar)
# # => :bar
#
# session.fetch(:foo) do
# :bar
# end
# # => :bar
def fetch(key, default=Unspecified, &block)
load_for_read!
if default == Unspecified
@delegate.fetch(key.to_s, &block)
else
@delegate.fetch(key.to_s, default, &block)
end
end
def inspect
if loaded?
super
else
"#<#{self.class}:0x#{(object_id << 1).to_s(16)} not yet loaded>"
end
end
def exists?
return @exists unless @exists.nil?
@exists = @by.send(:session_exists?, @req)
end
def loaded?
@loaded
end
def empty?
load_for_read!
@delegate.empty?
end
def merge!(other)
load_for_write!
@delegate.merge!(other)
end
def each(&block)
to_hash.each(&block)
end
private
def load_for_read!
load! if !loaded? && exists?
end
def load_for_write!
load! unless loaded?
end
def load!
id, session = @by.load_session @req
options[:id] = id
@delegate.replace(stringify_keys(session))
@loaded = true
end
def stringify_keys(other)
other.each_with_object({}) { |(key, value), hash|
hash[key.to_s] = value
}
end
end
end
end
|
