Add 'View on [env]' link to blobs and individual files in diffs

app/controllers/projects/blob_controller.rb

@@ -30,6 +30,9 @@ class Projects::BlobController < Projects::ApplicationController
   end
 
   def show
+    branch_name = @ref if @repository.branch_exists?(@ref)
+    @environment = @project.latest_environment_for(@commit, ref: branch_name)
+    @environment = nil unless can?(current_user, :read_environment, @environment)
   end
 
   def edit

app/controllers/projects/commit_controller.rb

@@ -95,6 +95,9 @@ class Projects::CommitController < Projects::ApplicationController
 
     @diffs = commit.diffs(opts)
     @notes_count = commit.notes.count
+
+    @environment = @project.latest_environment_for(@commit)
+    @environment = nil unless can?(current_user, :read_environment, @environment)
   end
 
   def define_note_vars

app/controllers/projects/compare_controller.rb

@@ -57,6 +57,10 @@ class Projects::CompareController < Projects::ApplicationController
 
       @diffs = @compare.diffs(diff_options)
 
+      branch_name = @head_ref if @repository.branch_exists?(@head_ref)
+      @environment = @project.latest_environment_for(@commit, ref: branch_name)
+      @environment = nil unless can?(current_user, :read_environment, @environment)
+
       @diff_notes_disabled = true
       @grouped_diff_discussions = {}
     end

app/controllers/projects/merge_requests_controller.rb

@@ -103,6 +103,9 @@ class Projects::MergeRequestsController < Projects::ApplicationController
       end
     end
 
+    @environment = @merge_request.latest_environment
+    @environment = nil unless can?(current_user, :read_environment, @environment)
+
     respond_to do |format|
       format.html { define_discussion_vars }
       format.json do
@@ -245,7 +248,10 @@ class Projects::MergeRequestsController < Projects::ApplicationController
                  end
         @diff_notes_disabled = true
 
-        render json: { html: view_to_html_string('projects/merge_requests/_new_diffs', diffs: @diffs) }
+        @environment = @merge_request.latest_environment
+        @environment = nil unless can?(current_user, :read_environment, @environment)
+
+        render json: { html: view_to_html_string('projects/merge_requests/_new_diffs', diffs: @diffs, environment: @environment) }
       end
     end
   end

app/helpers/commits_helper.rb

@@ -205,6 +205,17 @@ module CommitsHelper
     end
   end
 
+  def view_on_environment_btn(commit_sha, diff_new_path, environment)
+    return unless environment && commit_sha
+
+    external_url = environment.external_url_for(diff_new_path, commit_sha)
+    return unless external_url
+
+    link_to(external_url, class: 'btn btn-file-option has-tooltip', target: '_blank', title: "View on #{environment.formatted_external_url}", data: { container: 'body' }) do
+      icon('external-link')
+    end
+  end
+
   def truncate_sha(sha)
     Commit.truncate_sha(sha)
   end

app/models/ci/pipeline.rb

@@ -283,13 +283,7 @@ module Ci
     def ci_yaml_file
       return @ci_yaml_file if defined?(@ci_yaml_file)
 
-      @ci_yaml_file ||= begin
-        blob = project.repository.blob_at(sha, '.gitlab-ci.yml')
-        blob.load_all_data!(project.repository)
-        blob.data
-      rescue
-        nil
-      end
+      @ci_yaml_file ||= project.repository.ci_yaml_file(sha)
     end
 
     def has_yaml_errors?

app/models/environment.rb

@@ -51,6 +51,14 @@ class Environment < ActiveRecord::Base
     state :stopped
   end
 
+  def self.latest_for_commit(environments, commit)
+    environments.sort_by do |environment|
+      deployment = environment.first_deployment_for(commit)
+
+      deployment.try(:created_at) || DateTime.parse('1970-01-01')
+    end.last
+  end
+
   def predefined_variables
     [
       { key: 'CI_ENVIRONMENT_NAME', value: name, public: true },
@@ -171,6 +179,16 @@ class Environment < ActiveRecord::Base
     self.slug = slugified
   end
 
+  def external_url_for(path, commit_sha)
+    return unless self.external_url
+
+    public_path = project.public_path_for_source_path(path, commit_sha)
+    return unless public_path
+
+    # TODO: Verify this can't be used for XSS
+    URI.join(external_url, public_path).to_s
+  end
+
   private
 
   # Slugifying a name may remove the uniqueness guarantee afforded by it being

app/models/merge_request.rb

@@ -729,6 +729,12 @@ class MergeRequest < ActiveRecord::Base
     end
   end
 
+  def latest_environment
+    return @latest_environment if defined?(@latest_environment)
+
+    @latest_environment = Environment.latest_for_commit(environments, diff_head_commit)
+  end
+
   def state_human_name
     if merged?
       "Merged"

app/models/project.rb

@@ -1307,10 +1307,17 @@ class Project < ActiveRecord::Base
   end
 
   def environments_for(ref, commit: nil, with_tags: false)
-    deployments_query = with_tags ? 'ref = ? OR tag IS TRUE' : 'ref = ?'
+    deps =
+      if ref
+        deployments_query = with_tags ? 'ref = ? OR tag IS TRUE' : 'ref = ?'
+        deployments.where(deployments_query, ref.to_s)
+      elsif commit
+        deps = deployments.where(sha: commit.sha)
+      else
+        Deployment.none
+      end
 
-    environment_ids = deployments
-      .where(deployments_query, ref.to_s)
+    environment_ids = deps
       .group(:environment_id)
       .select(:environment_id)
 
@@ -1324,12 +1331,46 @@ class Project < ActiveRecord::Base
     end
   end
 
+  def latest_environment_for(commit, ref: nil)
+    environments = environments_for(ref, commit: commit)
+    Environment.latest_for_commit(environments, commit)
+  end
+
   def environments_recently_updated_on_branch(branch)
     environments_for(branch).select do |environment|
       environment.recently_updated_on_branch?(branch)
     end
   end
 
+  def route_map_for_commit(commit_sha)
+    @route_maps_by_commit ||= Hash.new do |h, sha|
+      h[sha] = begin
+        data = repository.route_map_file(sha)
+        next unless data
+
+        # TODO: Validate
+        YAML.safe_load(data).map do |mapping|
+          {
+            source: Regexp.new("^#{mapping['source'][1...-1]}$"),
+            public: mapping['public']
+          }
+        end
+      end
+    end
+
+    @route_maps_by_commit[commit_sha]
+  end
+
+  def public_path_for_source_path(path, commit_sha)
+    map = route_map_for_commit(commit_sha)
+    return unless map
+
+    mapping = map.find { |mapping| path =~ mapping[:source] }
+    return unless mapping
+
+    path.sub(mapping[:source], mapping[:public])
+  end
+
   private
 
   def cross_namespace_reference?(from)

app/models/repository.rb

@@ -35,6 +35,9 @@ class Repository
     avatar: :avatar
   }
 
+  ROUTE_MAP_PATH = '.gitlab/route-map.yml'
+  GITLAB_CI_YML_PATH = '.gitlab-ci.yml'
+
   # Wraps around the given method and caches its output in Redis and an instance
   # variable.
   #
@@ -1184,6 +1187,20 @@ class Repository
     end
   end
 
+  def route_map_file(sha)
+    blob = blob_at(sha, ROUTE_MAP_PATH)
+    return unless blob
+    blob.load_all_data!(self)
+    blob.data
+  end
+
+  def ci_yaml_file(sha)
+    blob = blob_at(sha, GITLAB_CI_YML_PATH)
+    return unless blob
+    blob.load_all_data!(self)
+    blob.data
+  end
+
   private
 
   def git_action(index, action)

app/views/projects/blob/_actions.html.haml

@@ -1,3 +1,6 @@
+.btn-group
+  = view_on_environment_btn(@commit.sha, @path, @environment) if @environment
+  
 .btn-group.tree-btn-group
   = link_to 'Raw', namespace_project_raw_path(@project.namespace, @project, @id),
       class: 'btn btn-sm', target: '_blank'

app/views/projects/commit/show.html.haml

@@ -9,7 +9,7 @@
     = render "ci_menu"
   - else
     .block-connector
-  = render "projects/diffs/diffs", diffs: @diffs
+  = render "projects/diffs/diffs", diffs: @diffs, environment: @environment
   = render "projects/notes/notes_with_form"
   - if can_collaborate_with_project?
     - %w(revert cherry-pick).each do |type|

app/views/projects/compare/show.html.haml

@@ -8,7 +8,7 @@
 
   - if @commits.present?
     = render "projects/commits/commit_list"
-    = render "projects/diffs/diffs", diffs: @diffs
+    = render "projects/diffs/diffs", diffs: @diffs, environment: @environment
   - else
     .light-well
       .center

app/views/projects/diffs/_diffs.html.haml

@@ -1,3 +1,4 @@
+- environment = local_assigns.fetch(:environment, nil)
 - show_whitespace_toggle = local_assigns.fetch(:show_whitespace_toggle, true)
 - can_create_note = !@diff_notes_disabled && can?(current_user, :create_note, diffs.project)
 - diff_files = diffs.diff_files
@@ -30,4 +31,4 @@
     - file_hash = hexdigest(diff_file.file_path)
 
     = render 'projects/diffs/file', file_hash: file_hash, project: diffs.project,
-      diff_file: diff_file, diff_commit: diff_commit, blob: blob
+      diff_file: diff_file, diff_commit: diff_commit, blob: blob, environment: environment

app/views/projects/diffs/_file.html.haml

@@ -1,3 +1,4 @@
+- environment = local_assigns.fetch(:environment, nil)
 .diff-file.file-holder{ id: file_hash, data: diff_file_html_data(project, diff_file.file_path, diff_commit.id) }
   .file-title
     = render "projects/diffs/file_header", diff_file: diff_file, blob: blob, diff_commit: diff_commit, project: project, url: "##{file_hash}"
@@ -14,5 +15,6 @@
                              blob: blob, link_opts: link_opts)
 
         = view_file_btn(diff_commit.id, diff_file.new_path, project)
+        = view_on_environment_btn(diff_commit.id, diff_file.new_path, environment) if environment
 
   = render 'projects/diffs/content', diff_file: diff_file, diff_commit: diff_commit, blob: blob, project: project

app/views/projects/merge_requests/_new_diffs.html.haml

@@ -1 +1 @@
-= render "projects/diffs/diffs", diffs: @diffs, show_whitespace_toggle: false
+= render "projects/diffs/diffs", diffs: @diffs, environment: @environment, show_whitespace_toggle: false

app/views/projects/merge_requests/show/_diffs.html.haml

@@ -1,5 +1,5 @@
 - if @merge_request_diff.collected? || @merge_request_diff.overflow?
   = render 'projects/merge_requests/show/versions'
-  = render "projects/diffs/diffs", diffs: @diffs
+  = render "projects/diffs/diffs", diffs: @diffs, environment: @environment
 - elsif @merge_request_diff.empty?
   .nothing-here-block Nothing to merge from #{@merge_request.source_branch} into #{@merge_request.target_branch}

changelogs/unreleased/route-map.yml

@@ -0,0 +1,4 @@
+---
+title: Add 'View on [env]' link to blobs and individual files in diffs
+merge_request:
+author: