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+#
+# cgi/session/pstore.rb - persistent storage of marshalled session data
+#
+# Documentation: William Webber (william@williamwebber.com)
+#
+# == Overview
+#
+# This file provides the CGI::Session::PStore class, which builds
+# persistent of session data on top of the pstore library.  See
+# cgi/session.rb for more details on session storage managers.
+
+require 'cgi/session'
+require 'pstore'
+
+class CGI
+  class Session
+    # PStore-based session storage class.
+    #
+    # This builds upon the top-level PStore class provided by the
+    # library file pstore.rb.  Session data is marshalled and stored
+    # in a file.  File locking and transaction services are provided.
+    class PStore
+      # Create a new CGI::Session::PStore instance
+      #
+      # This constructor is used internally by CGI::Session.  The
+      # user does not generally need to call it directly.
+      #
+      # +session+ is the session for which this instance is being
+      # created.  The session id must only contain alphanumeric
+      # characters; automatically generated session ids observe
+      # this requirement.
+      #
+      # +option+ is a hash of options for the initializer.  The
+      # following options are recognised:
+      #
+      # tmpdir:: the directory to use for storing the PStore
+      #          file.  Defaults to Dir::tmpdir (generally "/tmp"
+      #          on Unix systems).
+      # prefix:: the prefix to add to the session id when generating
+      #          the filename for this session's PStore file.
+      #          Defaults to the empty string.
+      #
+      # This session's PStore file will be created if it does
+      # not exist, or opened if it does.
+      def initialize(session, option={})
+        dir = option['tmpdir'] || Dir::tmpdir
+        prefix = option['prefix'] || ''
+        id = session.session_id
+        require 'digest/md5'
+        md5 = Digest::MD5.hexdigest(id)[0,16]
+        path = dir+"/"+prefix+md5
+        path.untaint
+        if File::exist?(path)
+          @hash = nil
+        else
+          unless session.new_session
+            raise CGI::Session::NoSession, "uninitialized session"
+          end
+          @hash = {}
+        end
+        @p = ::PStore.new(path)
+        @p.transaction do |p|
+          File.chmod(0600, p.path)
+        end
+      end
+
+      # Restore session state from the session's PStore file.
+      #
+      # Returns the session state as a hash.
+      def restore
+        unless @hash
+          @p.transaction do
+            @hash = @p['hash'] || {}
+          end
+        end
+        @hash
+      end
+
+      # Save session state to the session's PStore file.
+      def update
+        @p.transaction do
+          @p['hash'] = @hash
+        end
+      end
+
+      # Update and close the session's PStore file.
+      def close
+        update
+      end
+
+      # Close and delete the session's PStore file.
+      def delete
+        path = @p.path
+        File::unlink path
+      end
+
+    end
+  end
+end
+# :enddoc: