Class: PageTemplate::FileSource

Inherits:
Source
  • Object
show all
Defined in:
lib/PageTemplate/parser.rb

Overview

FileSource provides access to files within the ‘include_paths’ argument.

It attempts to be secure by not allowing any access outside of The directories detailed within include_paths

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ FileSource

initialize looks for the following in the args Hash:

* include_paths = a list of file paths
* include_path  = a single file path string 
                  (kept for backwards compatibility)



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# File 'lib/PageTemplate/parser.rb', line 228

def initialize(args = {})
  @args  = args
  if @args['include_paths']
    @paths = @args['include_paths']
  elsif @args['include_path']
    @paths = [ @args['include_path'] ]
  else
    @paths = [Dir.getwd,'/']
  end
  @paths = @paths.compact
  @cache = Hash.new(nil)
  @mtime = Hash.new(0)
end

Instance Attribute Details

#paths ⇒ Object

Returns the value of attribute paths.



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# File 'lib/PageTemplate/parser.rb', line 222

def paths
  @paths
end

Instance Method Details

#cache(name, cmds) ⇒ Object 



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# File 'lib/PageTemplate/parser.rb', line 261

def cache(name,cmds)
  fn = get_filename(name)
  @cache[fn] = cmds.dup
  @mtime[fn] = Time.now.to_i
end

#get(name) ⇒ Object

Return the contents of the file name, which must be within the include_paths.



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# File 'lib/PageTemplate/parser.rb', line 244

def get(name)
  fn = get_filename(name)
  begin
    case
  when fn.nil?
    nil
  when @cache.has_key?(fn) && (@mtime[fn] > File.mtime(fn).to_i)
    cmds = @cache[fn]
    cmds.clear_cache
    cmds
  else
    IO.read(fn)
  end
  rescue Exception => er
    return "[ Unable to open file #{fn} because of #{er.message} ]"
  end
end

#get_filename(file) ⇒ Object 



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# File 'lib/PageTemplate/parser.rb', line 266

def get_filename(file)
  # Check for absolute filepaths
  if file == File.expand_path(file)
    if File.exists?(file)
      return file
    end
  end
  file = file.gsub(/\.\.\//,'') 
  @paths.each do |path|
    fn = File.join(path,file)
    fn.untaint
    if File.exists?(fn)
      return fn
    end
  end
  return nil
end