# Controller for viewing a file's blame
class BlobController < ApplicationController
  # Thrown when given an invalid path
  class InvalidPathError < StandardError; end

  include RefExtractor
  include Gitlab::Encode

  layout "project"

  before_filter :project

  # Authorize
  before_filter :add_project_abilities
  before_filter :authorize_read_project!
  before_filter :authorize_code_access!
  before_filter :require_non_empty_project

  before_filter :define_tree_vars

  def show
    if @tree.is_blob?
      if @tree.text?
        encoding = detect_encoding(@tree.data)
        mime_type = encoding ? "text/plain; charset=#{encoding}" : "text/plain"
      else
        mime_type = @tree.mime_type
      end

      send_data(
        @tree.data,
        type: mime_type,
        disposition: 'inline',
        filename: @tree.name
      )
    else
      not_found!
    end
  end

  private

  def define_tree_vars
    @ref, @path = extract_ref(params[:id])

    @id     = File.join(@ref, @path)
    @repo   = @project.repo
    @commit = CommitDecorator.decorate(@project.commit(@ref))

    @tree = Tree.new(@commit.tree, @project, @ref, @path)
    @tree = TreeDecorator.new(@tree)

    raise InvalidPathError if @tree.invalid?

    @hex_path = Digest::SHA1.hexdigest(@path)

    @history_path = project_tree_path(@project, @id)
    @logs_path    = logs_file_project_ref_path(@project, @ref, @path)
  rescue NoMethodError, InvalidPathError
    not_found!
  end
end