Module: Secure::Marshal

Defined in:
lib/appswarm/secure_marshal.rb,
lib/appswarm/secure_marshal.rb

Defined Under Namespace

Classes: OutOfData

Class Method Summary collapse

Class Method Details

.dump(o) ⇒ Object

this function work pretty much like ruby standard marshaling. But it supports only some small set of types, being some basic-types like symbols, numbers, strings, hashes, arrays and structs. This is good, because you won’t be able to pass custom-objects through the network and thus causing security vulnerabilities. You can however create structs with Struct.new(…) and add functions to this struct. The encoding is PHP-serialization-alike, because it’s relatively compact but still is halfway human-readable. It may become necessary to create a shorter syntax in the future.



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# File 'lib/appswarm/secure_marshal.rb', line 48

def self.dump(o)
  case o
    when String
      "s:"+dump(o.length)+o
    when Integer
      "i:"+o.to_s+":" 
    when Float
      "f:"+o.to_s+":"
    when Array
      "a:"+dump(o.length)+o.map{|elem|dump(elem)}.join("")
    when NilClass
      "b:n" # nil
    when TrueClass
      "b:t" # true
    when FalseClass
      "b:f"
    when Hash
      "h:"+dump(o.to_a)
    when Symbol
      "y:"+dump(o.to_s)
    else
      if o.respond_to?(:members) and o.respond_to?(:values) 
        n=o.class.to_s
        hash={}
        o.members.each{|m|
          hash[m]=o.send(m)
        }
        "o:"+dump(n)+dump(hash)
      else
        raise "Unknown Type to marshal #{o}"
      end
  end
end

.load(o) ⇒ Object

load takes either a string or an object of type Secure::Data. It tries to load an object and return it. If no parsable object is found, an OutOfData exception will be raised.



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# File 'lib/appswarm/secure_marshal.rb', line 84

def self.load(o)
  unless o.is_a?(Data)
    return load(Data.new(o))
  end
  orig=o.str
  bt=o.dup
  result=case o.read(2)[0..0]
    when "b"
      case o.read(1)
        when "n"
          nil
        when "t"
          true
        when "f"
          false
      end
    when "s"
      len=load(o)
      r=o.read(len)
      r
    when "i"
      o.til(":").to_i
    when "f"
      o.til(":").to_f
    when "a"
      len=load(o)
      assert{len.is_a?(Numeric)}
      (0...len).to_a.map{|i|
        load(o)
      }
    when "h"
      a=load(o)
      h={}
      a.each{|p|
        h[p[0]]=p[1]
      }
      h
    when "y"
      load(o).to_sym
    when "o"
      name=load(o)
      hash=load(o)
      klass=getClass(name)
      mo=klass.new
      hash.each{|k,v|
        mo.send(k+"=",v) if mo.members.member?(k) and mo.respond_to?(k+"=")
      }
      mo
  end
  #pp "LOADING: #{orig.inspect} now:#{o.str.inspect} RES:#{result.inspect}"
  result
end