Class: Brakeman::TemplateAliasProcessor

Inherits:
AliasProcessor show all
Includes:
RenderHelper
Defined in:
lib/brakeman/processors/template_alias_processor.rb

Overview

Processes aliasing in templates. Handles calls to render.

Constant Summary collapse

FORM_METHODS = 
Set[:form_for, :remote_form_for, :form_remote_for]

Constants included from Util

Util::ALL_PARAMETERS, Util::COOKIES, Util::PARAMETERS, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION

Constants inherited from SexpProcessor

SexpProcessor::VERSION

Instance Attribute Summary

Attributes inherited from AliasProcessor

#result

Attributes inherited from SexpProcessor

#context, #env, #expected

Instance Method Summary collapse

Methods included from RenderHelper

#get_class_target, #get_options, #process_action, #process_layout, #process_partial, #process_render

Methods inherited from AliasProcessor

#duplicate?, #join_arrays, #join_strings, #only_ivars, #process_array_access, #process_attrasgn, #process_block, #process_call, #process_cdecl, #process_cvdecl, #process_default, #process_gasgn, #process_hash_access, #process_hash_merge, #process_hash_merge!, #process_iasgn, #process_if, #process_lasgn, #process_methdef, #process_op_asgn1, #process_op_asgn2, #process_safely, #process_scope, #process_selfdef, #process_svalue, #set_line

Methods included from Util

#array?, #call?, #camelize, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #node_type?, #number?, #params?, #pluralize, #regexp?, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #symbol?, #table_to_csv, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#class_name, #process_all, #process_module

Methods inherited from SexpProcessor

#error_handler, #in_context, #process, #process_dummy, #scope

Constructor Details

#initialize(tracker, template, called_from = nil) ⇒ TemplateAliasProcessor

Returns a new instance of TemplateAliasProcessor.



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

def initialize tracker, template, called_from = nil
  super tracker
  @template = template
  @called_from = called_from
end

Instance Method Details

#find_push_target(exp) ⇒ Object

Ignore ‘<<` calls on template variables which are used by the templating library (HAML, ERB, etc.)



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 101

def find_push_target exp
  if sexp? exp
    if exp.node_type == :lvar and (exp.value == :_buf or exp.value == :_erbout)
      return nil
    elsif exp.node_type == :ivar and exp.value == :@output_buffer
      return nil
    elsif exp.node_type == :call and call? exp.target and
      exp.target.method == :_hamlout and exp.method == :buffer

      return nil
    end
  end

  super
end

#get_model_target(exp) ⇒ Object

Checks if exp is a call to Model.all or Model.find*



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

def get_model_target exp
  if call? exp
    target = exp.target

    if exp.method == :all or exp.method.to_s[0,4] == "find"
      models = Set.new @tracker.models.keys

      begin
        name = class_name target
        return target if models.include?(name)
      rescue StandardError
      end

    end

    return get_model_target(target)
  end

  false
end

#process_call_with_block(exp) ⇒ Object Also known as: process_iter

Looks for form methods and iterating over collections of Models



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 41

def process_call_with_block exp
  process_default exp
  
  call = exp.block_call

  if call? call
    target = call.target
    method = call.method
    args = exp.block_args
    block = exp.block

    #Check for e.g. Model.find.each do ... end
    if method == :each and args and block and model = get_model_target(target)
      if node_type? args, :lasgn
        if model == target.target
          env[Sexp.new(:lvar, args.lhs)] = Sexp.new(:call, model, :new, Sexp.new(:arglist))
        else
          env[Sexp.new(:lvar, args.lhs)] = Sexp.new(:call, Sexp.new(:const, Brakeman::Tracker::UNKNOWN_MODEL), :new, Sexp.new(:arglist))
        end

        process block if sexp? block
      end
    elsif FORM_METHODS.include? method
      if node_type? args, :lasgn
        env[Sexp.new(:lvar, args.lhs)] = Sexp.new(:call, Sexp.new(:const, :FormBuilder), :new, Sexp.new(:arglist)) 

        process block if sexp? block
      end
    end
  end

  exp
end

#process_template(name, args) ⇒ Object

Process template



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 19

def process_template name, args
  if @called_from
    unless @called_from.grep(/Template:#{name}$/).empty?
      Brakeman.debug "Skipping circular render from #{@template[:name]} to #{name}"
      return
    end

    super name, args, @called_from + ["Template:#{@template[:name]}"]
  else
    super name, args, ["Template:#{@template[:name]}"]
  end
end

#template_name(name) ⇒ Object

Determine template name



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 33

def template_name name
  unless name.to_s.include? "/"
    name = "#{@template[:name].to_s.match(/^(.*\/).*$/)[1]}#{name}"
  end
  name
end