Add TreeController and spec

app/controllers/tree_controller.rb

+# Controller for viewing a repository's file structure
+class TreeController < ApplicationController
+  # Thrown when given an invalid path
+  class InvalidPathError < StandardError; end
+
+  include RefExtractor
+
+  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
+    respond_to do |format|
+      format.html
+      # Disable cache so browser history works
+      format.js { no_cache_headers }
+    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.gsub(/^\//, ''))
+    @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

app/models/tree.rb

 class Tree
-   include Linguist::BlobHelper
+  include Linguist::BlobHelper
   attr_accessor :path, :tree, :project, :ref
 
   delegate :contents,
@@ -14,8 +14,8 @@ class Tree
     to: :tree
 
   def initialize(raw_tree, project, ref = nil, path = nil)
-    @project, @ref, @path = project, ref, path,
-    @tree = if path
+    @project, @ref, @path = project, ref, path
+    @tree = if path.present?
               raw_tree / path.dup.force_encoding('ascii-8bit')
             else
               raw_tree
@@ -26,6 +26,10 @@ class Tree
     tree.is_a?(Grit::Blob)
   end
 
+  def invalid?
+    tree.nil?
+  end
+
   def empty?
     data.blank?
   end

spec/controllers/tree_controller_spec.rb

+require 'spec_helper'
+
+describe TreeController do
+  let(:project) { create(:project) }
+  let(:user)    { create(:user) }
+
+  before do
+    sign_in(user)
+
+    project.add_access(user, :read, :admin)
+
+    project.stub(:branches).and_return(['master', 'foo/bar/baz'])
+    project.stub(:tags).and_return(['v1.0.0', 'v2.0.0'])
+    controller.instance_variable_set(:@project, project)
+  end
+
+  describe "GET show" do
+    # Make sure any errors accessing the tree in our views bubble up to this spec
+    render_views
+
+    before { get :show, project_id: project.code, id: id }
+
+    context "valid branch, no path" do
+      let(:id) { 'master' }
+      it { should respond_with(:success) }
+    end
+
+    context "valid branch, valid path" do
+      let(:id) { 'master/README.md' }
+      it { should respond_with(:success) }
+    end
+
+    context "valid branch, invalid path" do
+      let(:id) { 'master/invalid-path.rb' }
+      it { should respond_with(:not_found) }
+    end
+
+    context "invalid branch, valid path" do
+      let(:id) { 'invalid-branch/README.md' }
+      it { should respond_with(:not_found) }
+    end
+  end
+end

spec/spec_helper.rb

@@ -28,6 +28,7 @@ RSpec.configure do |config|
   config.include LoginHelpers, type: :request
   config.include GitoliteStub
   config.include FactoryGirl::Syntax::Methods
+  config.include Devise::TestHelpers, type: :controller
 
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false