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]
HAML_CAPTURE = 
[:capture, :capture_haml]
UNKNOWN_MODEL_CALL = 
Sexp.new(:call, Sexp.new(:const, Brakeman::Tracker::UNKNOWN_MODEL), :new)
FORM_BUILDER_CALL = 
Sexp.new(:call, Sexp.new(:const, :FormBuilder), :new)
COLLECTION_METHODS = 
[:all, :find, :select, :where]

Constants inherited from AliasProcessor

AliasProcessor::ARRAY_CONST, AliasProcessor::HASH_CONST, AliasProcessor::RAILS_DEV, AliasProcessor::RAILS_TEST, AliasProcessor::STRING_NEW, AliasProcessor::TEMP_FILE_CLASS

Constants included from CallConversionHelper

CallConversionHelper::STRING_LENGTH_LIMIT

Constants included from Util

Util::ALL_COOKIES, Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::DIR_CONST, Util::LITERALS, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_COOKIES, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::REQUEST_REQUEST_PARAMETERS, Util::SAFE_LITERAL, Util::SESSION, Util::SESSION_SEXP, Util::SIMPLE_LITERALS

Constants inherited from SexpProcessor

SexpProcessor::VERSION

Instance Attribute Summary

Attributes inherited from AliasProcessor

#result, #tracker

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

#all_literals_when?, #array_detect_all_literals?, #array_include_all_literals?, #assign_args, #collapse_send_call, #duplicate?, #early_return?, #equality_check?, #find_method, #get_call_value, #get_rhs, #hash_include_all_literals?, #hash_or_array_include_all_literals?, #in_array_all_literals?, #join_item, #merge_if_branch, #meth_env, #new_string?, #only_ivars, #only_request_vars, #process_array_join, #process_attrasgn, #process_block, #process_bracket_call, #process_branch_with_value, #process_call, #process_case, #process_cdecl, #process_cvdecl, #process_default, #process_defn, #process_defs, #process_gasgn, #process_hash, #process_hash_merge, #process_hash_merge!, #process_helper_method, #process_iasgn, #process_if, #process_if_branch, #process_masgn, #process_op_asgn1, #process_op_asgn2, #process_or_simple_operation, #process_or_target, #process_safely, #process_scope, #process_svalue, #raise?, #replace, #same_value?, #self_assign?, #self_assign_target?, #self_assign_var?, #set_value, #simple_when?, #splat_array?, #temp_file_new, #temp_file_open?, #too_deep?, #top_target, #value_from_case, #value_from_if

Methods included from CallConversionHelper

#hash_values_at, #join_arrays, #join_strings, #math_op, #process_array_access, #process_hash_access

Methods included from Util

#all_literals?, #array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #cookies?, #dir_glob?, #false?, #hash?, #hash_access, #hash_insert, #hash_iterate, #hash_values, #integer?, #kwsplat?, #literal?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #recurse_check?, #regexp?, #remove_kwsplat, #request_headers?, #request_value?, #result?, #safe_literal, #safe_literal?, #safe_literal_target?, #set_env_defaults, #sexp?, #simple_literal?, #string?, #string_interp?, #symbol?, #template_path_to_name, #true?, #underscore

Methods included from ProcessorHelper

#current_file, #process_all, #process_all!, #process_call_args, #process_call_defn?, #process_class, #process_module

Methods inherited from SexpProcessor

#in_context, #process, processors, #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 14

def initialize tracker, template, called_from = nil
  super tracker
  @template = template
  @current_file = template.file
  @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 135

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 117

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

    if COLLECTION_METHODS.include? exp.method or exp.method.to_s[0,4] == "find"
      models = Set.new @tracker.models.keys
      name = class_name target
      return target if models.include?(name)
    end

    return get_model_target(target)
  end

  false
end

#haml_capture?(exp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/processors/template_alias_processor.rb', line 62

def haml_capture? exp
  node_type? exp, :iter and
    call? exp.block_call and
    HAML_CAPTURE.include? exp.block_call.method
end

#process_iter(exp) ⇒ Object

Looks for form methods and iterating over collections of Models



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 80

def process_iter exp
  process_default exp

  call = exp.block_call

  if call? call
    target = call.target
    method = call.method
    arg = exp.block_args.first_param
    block = exp.block

    #Check for e.g. Model.find.each do ... end
    if method == :each and arg and block and model = get_model_target(target)
      if arg.is_a? Symbol
        if model == target.target
          env[Sexp.new(:lvar, arg)] = Sexp.new(:call, model, :new)
        else
          env[Sexp.new(:lvar, arg)] = UNKNOWN_MODEL_CALL
        end

        process block if sexp? block
      end
    elsif FORM_METHODS.include? method
      if arg.is_a? Symbol
        env[Sexp.new(:lvar, arg)] = FORM_BUILDER_CALL

        process block if sexp? block
      end
    end
  end

  exp
end

#process_lasgn(exp) ⇒ Object 



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 40

def process_lasgn exp
  if exp.lhs == :haml_temp or haml_capture? exp.rhs
    exp.rhs = process exp.rhs

    # Avoid propagating contents of block
    if node_type? exp.rhs, :iter
      new_exp = exp.dup
      new_exp.rhs = exp.rhs.block_call

      super new_exp

      exp # Still save the original, though
    else
      super exp
    end
  else
    super exp
  end
end

#process_template(name, args, _, line = nil) ⇒ Object

Process template



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 22

def process_template name, args, _, line = nil
  # Strip forward slash from beginning of template path.
  # This also happens in RenderHelper#process_template but
  # we need it here too to accurately avoid circular renders below.
  name = name.to_s.gsub(/^\//, "")

  if @called_from
    if @called_from.include_template? name
      Brakeman.debug "Skipping circular render from #{@template.name} to #{name}"
      return
    end

    super name, args, @called_from.dup.add_template_render(@template.name, line, @current_file), line
  else
    super name, args, Brakeman::RenderPath.new.add_template_render(@template.name, line, @current_file), line
  end
end

#template_name(name) ⇒ Object

Determine template name



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# File 'lib/brakeman/processors/template_alias_processor.rb', line 69

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