Class: Brakeman::Haml6TemplateProcessor

Inherits:
HamlTemplateProcessor
  • Object
show all
Defined in:
lib/brakeman/processors/haml6_template_processor.rb

Constant Summary collapse

OUTPUT_BUFFER = 
s(:ivar, :@output_buffer)
HAML_UTILS = 
s(:colon2, s(:colon3, :Haml), :Util)
HAML_UTILS2 = 
s(:colon2, s(:const, :Haml), :Util)
AV_SAFE_BUFFER = 
s(:or, s(:call, nil, :output_buffer), s(:call, s(:colon2, s(:const, :ActionView), :OutputBuffer), :new))
EMBEDDED_FILTER = 
s(:const, :BrakemanFilter)

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Haml6TemplateProcessor

Returns a new instance of Haml6TemplateProcessor.



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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 12

def initialize(*)
  super

  # Because of how Haml 6 handles line breaks -
  # we have to track where _haml_compiler variables are assigned.
  # then change the line number of where they are output to where
  # they are assigned.
  #
  # Like this:
  #
  #   ; _haml_compiler1 = (params[:x]; 
  #   ; ); @output_buffer.safe_concat((((::Haml::Util.escape_html_safe((_haml_compiler1))).to_s).to_s));
  #
  #  `_haml_compiler1` is output a line after it's assigned,
  #  but the assignment matches the "real" line where it is output in the template.
  @compiler_assigns = {}
end

Instance Method Details

#buffer_append?(exp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 31

def buffer_append? exp
  call? exp and
    output_buffer? exp.target and
    exp.method == :safe_concat
end

#embedded_filter?(arg) ⇒ Boolean

Handle our "fake" embedded filters

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 89

def embedded_filter? arg
  call? arg and arg.method == :render and arg.target == EMBEDDED_FILTER
end

#html_escaped?(call) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 68

def html_escaped? call
  (call.target == HAML_UTILS or call.target == HAML_UTILS2) and
    (call.method == :escape_html or call.method == :escape_html_safe)
end

#is_escaped?(exp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 54

def is_escaped? exp
  return unless call? exp

  html_escaped? exp or
    javascript_escaped? exp
end

#javascript_escaped?(call) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 61

def javascript_escaped? call
  # TODO: Adding here to match existing behavior for HAML,
  # but really this is not safe and needs to be revisited
    call.method == :j or
      call.method == :escape_javascript
end

#normalize_output(arg) ⇒ Object 



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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 78

def normalize_output arg
  arg = super(arg)

  if embedded_filter? arg
    super(arg.first_arg)
  else
    arg
  end
end

#output_buffer?(exp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 73

def output_buffer? exp
  exp == OUTPUT_BUFFER or
    exp == AV_SAFE_BUFFER
end

#process_lasgn(exp) ⇒ Object 



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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 37

def process_lasgn exp
  if exp.lhs.match?(/_haml_compiler\d+/)
    @compiler_assigns[exp.lhs] = exp.rhs
    ignore
  else
    exp
  end
end

#process_lvar(exp) ⇒ Object 



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# File 'lib/brakeman/processors/haml6_template_processor.rb', line 46

def process_lvar exp
  if exp.value.match?(/_haml_compiler\d+/)
    exp = @compiler_assigns[exp.value] || exp
  end

  exp
end