Class: Brakeman::Rescanner

Inherits:
Scanner show all
Defined in:
lib/brakeman/rescanner.rb

Overview

Class for rescanning changed files after an initial scan

Constant Summary collapse

SCAN_ORDER = 
[:config, :gemfile, :initializer, :lib, :routes, :template,
:model, :controller]

Constants inherited from Scanner

Scanner::KNOWN_TEMPLATE_EXTENSIONS, Scanner::RUBY_1_9

Instance Attribute Summary

Attributes inherited from Scanner

#options

Instance Method Summary collapse

Methods inherited from Scanner

#index_call_sites, #parse_ruby, #process, #process_config, #process_controller, #process_controllers, #process_gems, #process_initializer, #process_initializers, #process_lib, #process_libs, #process_model, #process_models, #process_routes, #process_template, #process_templates, #template_path_to_name, #tracker

Constructor Details

#initialize(options, processor, changed_files) ⇒ Rescanner

Create new Rescanner to scan changed files



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# File 'lib/brakeman/rescanner.rb', line 12

def initialize options, processor, changed_files
  super(options, processor)

  @paths = changed_files.map {|f| File.expand_path f, tracker.options[:app_path] }
  @old_results = tracker.checks  #Old warnings from previous scan
  @changes = nil                 #True if files had to be rescanned
  @reindex = Set.new
end

Instance Method Details

#file_type(path) ⇒ Object

Guess at what kind of file the path contains



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# File 'lib/brakeman/rescanner.rb', line 293

def file_type path
  case path
  when /\/app\/controllers/
    :controller
  when /\/app\/views/
    :template
  when /\/app\/models/
    :model
  when /\/lib/
    :lib
  when /\/config\/initializers/
    :initializer
  when /config\/routes\.rb/
    :routes
  when /\/config\/.+\.rb/
    :config
  when /Gemfile/
    :gemfile
  else
    :unknown
  end
end

#recheck ⇒ Object

Runs checks. Will rescan files if they have not already been scanned



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# File 'lib/brakeman/rescanner.rb', line 23

def recheck
  rescan if @changes.nil?

  tracker.run_checks if @changes

  Brakeman::RescanReport.new @old_results, tracker
end

#remove_deleted_file(path) ⇒ Object

Check controllers, templates, models and libs for data from file and delete it.



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# File 'lib/brakeman/rescanner.rb', line 277

def remove_deleted_file path
  deleted = false

  [:controllers, :templates, :models, :libs].each do |collection|
    tracker.send(collection).delete_if do |name, data|
      if data[:file] == path
        deleted = true
        true
      end
    end
  end

  deleted
end

#rescan ⇒ Object

Rescans changed files



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# File 'lib/brakeman/rescanner.rb', line 32

def rescan
  tracker.template_cache.clear

  paths_by_type = {}

  SCAN_ORDER.each do |type|
    paths_by_type[type] = []
  end

  @paths.each do |path|
    type = file_type(path)
    paths_by_type[type] << path unless type == :unknown
  end

  @changes = false

  SCAN_ORDER.each do |type|
    paths_by_type[type].each do |path|
      Brakeman.debug "Rescanning #{path} as #{type}"

      if rescan_file path, type
        @changes = true
      end
    end
  end

  if @changes and not @reindex.empty?
    tracker.reindex_call_sites @reindex
  end

  self
end

#rescan_controller(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 110

def rescan_controller path
  #Process source
  process_controller path

  #Process data flow and template rendering
  #from the controller
  tracker.controllers.each do |name, controller|
    if controller[:file] == path
      tracker.templates.each do |template_name, template|
        next unless template[:caller]
        unless template[:caller].grep(/^#{name}#/).empty?
          tracker.reset_template template_name
        end
      end

      @processor.process_controller_alias controller[:name], controller[:src]
    end
  end
end

#rescan_deleted_controller(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 231

def rescan_deleted_controller path
  tracker.reset_controller path
end

#rescan_deleted_file(path, type) ⇒ Object

Handle rescanning when a file is deleted



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# File 'lib/brakeman/rescanner.rb', line 208

def rescan_deleted_file path, type
  case type
  when :controller
    rescan_deleted_controller path
  when :template
    rescan_deleted_template path
  when :model
    rescan_model path
  when :lib
    rescan_deleted_lib path
  when :initializer
    rescan_deleted_initializer path
  else
    if remove_deleted_file path
      return true
    else
      Brakeman.notify "Ignoring deleted file: #{path}"
    end
  end

  true
end

#rescan_deleted_initializer(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 271

def rescan_deleted_initializer path
  tracker.initializers.delete Pathname.new(path).basename.to_s
end

#rescan_deleted_lib(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 258

def rescan_deleted_lib path
  deleted_lib = nil

  tracker.libs.delete_if do |name, lib|
    if lib[:file] == path
      deleted_lib = lib
      true
    end
  end

  rescan_mixin deleted_lib if deleted_lib
end

#rescan_deleted_template(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 235

def rescan_deleted_template path
  return unless path.match KNOWN_TEMPLATE_EXTENSIONS

  template_name = template_path_to_name(path)

  #Remove template
  tracker.reset_template template_name

  rendered_from_controller = /^#{template_name}\.(.+Controller)#(.+)/
  rendered_from_view = /^#{template_name}\.Template:(.+)/

  #Remove any rendered versions, or partials rendered from it
  tracker.templates.delete_if do |name, template|
    if template[:file] == path
      true
    elsif template[:file].nil?
      name = name.to_s

      name.match(rendered_from_controller) or name.match(rendered_from_view)
    end
  end
end

#rescan_file(path, type = nil) ⇒ Object

Rescans a single file



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# File 'lib/brakeman/rescanner.rb', line 66

def rescan_file path, type = nil
  type ||= file_type path

  unless File.exist? path
    return rescan_deleted_file path, type
  end

  case type
  when :controller
    rescan_controller path
    @reindex << :controllers << :templates
  when :template
    rescan_template path
    @reindex << :templates
  when :model
    rescan_model path
  when :lib
    rescan_lib path
  when :config
    process_config
  when :initializer
    process_initializer path
  when :routes
    # Routes affect which controller methods are treated as actions
    # which affects which templates are rendered, so routes, controllers,
    # and templates rendered from controllers must be rescanned
    tracker.reset_routes
    tracker.reset_templates :only_rendered => true
    process_routes
    process_controllers
    @reindex << :controllers << :templates
  when :gemfile
    if tracker.config[:gems][:rails_xss] and tracker.config[:escape_html]
      tracker.config[:escape_html] = false
    end

    process_gems
  else
    return false #Nothing to do, file hopefully does not need to be rescanned
  end

  true
end

#rescan_lib(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 192

def rescan_lib path
  process_lib path if File.exists? path

  lib = nil

  tracker.libs.each do |name, library|
    if library[:file] == path
      lib = library
      break
    end
  end

  rescan_mixin lib if lib
end

#rescan_mixin(lib) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 316

def rescan_mixin lib
  method_names = []

  [:public, :private, :protected].each do |access|
    lib[access].each do |name, meth|
      method_names << name
    end
  end

  method_matcher = /##{method_names.map {|n| Regexp.escape(n.to_s)}.join('|')}$/

  #Rescan controllers that mixed in library
  tracker.controllers.each do |name, controller|
    if controller[:includes].include? lib[:name]
      unless @paths.include? controller[:file]
        rescan_file controller[:file]
      end
    end
  end

  to_rescan = []

  #Check if a method from this mixin was used to render a template.
  #This is not precise, because a different controller might have the
  #same method...
  tracker.templates.each do |name, template|
    next unless template[:caller]

    unless template[:caller].grep(method_matcher).empty?
      name.to_s.match /^([^.]+)/

      original = tracker.templates[$1.to_sym]

      if original
        to_rescan << [name, original[:file]]
      end
    end
  end

  to_rescan.each do |template|
    tracker.reset_template template[0]
    rescan_file template[1]
  end
end

#rescan_model(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 177

def rescan_model path
  num_models = tracker.models.length
  tracker.reset_model path
  process_model path if File.exists? path

  #Only need to rescan other things if a model is added or removed
  if num_models != tracker.models.length
    process_templates
    process_controllers
    @reindex << :templates << :controllers
  end

  @reindex << :models
end

#rescan_template(path) ⇒ Object 



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# File 'lib/brakeman/rescanner.rb', line 130

def rescan_template path
  return unless path.match KNOWN_TEMPLATE_EXTENSIONS and File.exist? path

  template_name = template_path_to_name(path)

  tracker.reset_template template_name
  process_template path

  @processor.process_template_alias tracker.templates[template_name]

  rescan = Set.new

  template_matcher = /^Template:(.+)/
  controller_matcher = /^(.+Controller)#(.+)/
  template_name_matcher = /^#{template_name}\./

  #Search for processed template and process it.
  #Search for rendered versions of template and re-render (if necessary)
  tracker.templates.each do |name, template|
    if template[:file] == path or template[:file].nil?
      next unless template[:caller] and name.to_s.match(template_name_matcher)

      template[:caller].each do |from|
        if from.match(template_matcher)
          rescan << [:template, $1.to_sym]
        elsif from.match(controller_matcher)
          rescan << [:controller, $1.to_sym, $2.to_sym]
        end
      end
    end
  end

  rescan.each do |r|
    if r[0] == :controller
      controller = tracker.controllers[r[1]]

      unless @paths.include? controller[:file]
        @processor.process_controller_alias controller[:name], controller[:src], r[2]
      end
    elsif r[0] == :template
      template = tracker.templates[r[1]]

      rescan_template template[:file]
    end
  end
end