Add proxy_download to perform proxied sending of all files

app/controllers/concerns/send_file_upload.rb

 module SendFileUpload
-  def send_upload(file_upload, send_params: {}, redirect_params: {}, attachment: nil)
+  def send_upload(file_upload, send_params: {}, redirect_params: {}, attachment: nil, disposition: 'attachment')
     if attachment
-      redirect_params[:query] = { "response-content-disposition" => "attachment;filename=#{attachment.inspect}" }
-      send_params.merge!(filename: attachment, disposition: 'attachment')
+      redirect_params[:query] = { "response-content-disposition" => "#{disposition};filename=#{attachment.inspect}" }
+      send_params.merge!(filename: attachment, disposition: disposition)
     end
 
     if file_upload.file_storage?
       send_file file_upload.path, send_params
+    elsif file_upload.class.proxy_download_enabled?
+      Gitlab::Workhorse.send_url(file_upload.url(**redirect_params))
     else
       redirect_to file_upload.url(**redirect_params)
     end

app/controllers/concerns/uploads_actions.rb

 module UploadsActions
   include Gitlab::Utils::StrongMemoize
+  include SendFileUpload
 
   UPLOAD_MOUNTS = %w(avatar attachment file logo header_logo).freeze
 
@@ -26,14 +27,11 @@ module UploadsActions
   def show
     return render_404 unless uploader&.exists?
 
-    if uploader.file_storage?
-      disposition = uploader.image_or_video? ? 'inline' : 'attachment'
     expires_in 0.seconds, must_revalidate: true, private: true
 
-      send_file uploader.file.path, disposition: disposition
-    else
-      redirect_to uploader.url
-    end
+    disposition = uploader.image_or_video? ? 'inline' : 'attachment'
+
+    send_upload(uploader, attachment: uploader.filename, disposition: disposition)
   end
 
   private

app/uploaders/object_storage.rb

@@ -127,6 +127,14 @@ module ObjectStorage
         object_store_options.background_upload
       end
 
+      def proxy_download_enabled?
+        object_store_options.proxy_download
+      end
+
+      def direct_download_enabled?
+        !proxy_download_enabled?
+      end
+
       def object_store_credentials
         object_store_options.connection.to_hash.deep_symbolize_keys
       end

config/gitlab.yml.example

@@ -149,6 +149,7 @@ production: &base
     #   enabled: false
     #   remote_directory: artifacts # The bucket name
     #   background_upload: false # Temporary option to limit automatic upload (Default: true)
+    #   proxy_download: false # Passthrough all downloads via GitLab instead of using Redirects to Object Storage
     #   connection:
     #     provider: AWS # Only AWS supported at the moment
     #     aws_access_key_id: AWS_ACCESS_KEY_ID
@@ -164,6 +165,7 @@ production: &base
       enabled: false
       remote_directory: lfs-objects # Bucket name
       # background_upload: false # Temporary option to limit automatic upload (Default: true)
+      # proxy_download: false # Passthrough all downloads via GitLab instead of using Redirects to Object Storage
       connection:
         provider: AWS
         aws_access_key_id: AWS_ACCESS_KEY_ID
@@ -183,6 +185,7 @@ production: &base
       enabled: true
       remote_directory: uploads # Bucket name
       # background_upload: false # Temporary option to limit automatic upload (Default: true)
+      # proxy_download: false # Passthrough all downloads via GitLab instead of using Redirects to Object Storage
       connection:
         provider: AWS
         aws_access_key_id: AWS_ACCESS_KEY_ID

config/initializers/1_settings.rb

@@ -309,6 +309,7 @@ Settings.artifacts['object_store'] ||= Settingslogic.new({})
 Settings.artifacts['object_store']['enabled'] = false if Settings.artifacts['object_store']['enabled'].nil?
 Settings.artifacts['object_store']['remote_directory'] ||= nil
 Settings.artifacts['object_store']['background_upload'] = true if Settings.artifacts['object_store']['background_upload'].nil?
+Settings.artifacts['object_store']['proxy_download'] = false if Settings.artifacts['object_store']['proxy_download'].nil?
 # Convert upload connection settings to use string keys, to make Fog happy
 Settings.artifacts['object_store']['connection']&.deep_stringify_keys!
 
@@ -357,6 +358,7 @@ Settings.lfs['object_store'] ||= Settingslogic.new({})
 Settings.lfs['object_store']['enabled'] = false if Settings.lfs['object_store']['enabled'].nil?
 Settings.lfs['object_store']['remote_directory'] ||= nil
 Settings.lfs['object_store']['background_upload'] = true if Settings.lfs['object_store']['background_upload'].nil?
+Settings.lfs['object_store']['proxy_download'] = false if Settings.lfs['object_store']['proxy_download'].nil?
 # Convert upload connection settings to use string keys, to make Fog happy
 Settings.lfs['object_store']['connection']&.deep_stringify_keys!
 
@@ -370,6 +372,7 @@ Settings.uploads['object_store'] ||= Settingslogic.new({})
 Settings.uploads['object_store']['enabled'] = false if Settings.uploads['object_store']['enabled'].nil?
 Settings.uploads['object_store']['remote_directory'] ||= 'uploads'
 Settings.uploads['object_store']['background_upload'] = true if Settings.uploads['object_store']['background_upload'].nil?
+Settings.uploads['object_store']['proxy_download'] = false if Settings.uploads['object_store']['proxy_download'].nil?
 # Convert upload connection settings to use string keys, to make Fog happy
 Settings.uploads['object_store']['connection']&.deep_stringify_keys!
 

doc/administration/job_artifacts.md

@@ -100,6 +100,32 @@ artifacts, you can use an object storage like AWS S3 instead.
 This configuration relies on valid AWS credentials to be configured already.
 Use an [Object storage option][os] like AWS S3 to store job artifacts.
 
+### Object Storage Settings
+
+For source installations the following settings are nested under `artifacts:` and then `object_store:`. On omnibus installs they are prefixed by `artifacts_object_store_`.
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| `enabled` | Enable/disable object storage | `false` |
+| `remote_directory` | The bucket name where Artfacts will be stored| |
+| `background_upload` | Set to false to disable automatic upload. Option may be removed once upload is direct to S3 | `true` |
+| `proxy_download` | Set to false to disable proxying all files served. Option allows to reduce egress traffic as this allows clients to download directly from remote storage instead of proxying all data | `false` |
+| `connection` | Various connection options described below | |
+
+#### S3 compatible connection settings
+
+The connection settings match those provided by [Fog](https://github.com/fog), and are as follows:
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| `provider` | Always `AWS` for compatible hosts | AWS |
+| `aws_access_key_id` | AWS credentials, or compatible | |
+| `aws_secret_access_key` | AWS credentials, or compatible | |
+| `region` | AWS region | us-east-1 |
+| `host` | S3 compatible host for when not using AWS, e.g. `localhost` or `storage.example.com` | s3.amazonaws.com |
+| `endpoint` | Can be used when configuring an S3 compatible service such as [Minio](https://www.minio.io), by entering a URL such as `http://127.0.0.1:9000` | (optional) |
+| `path_style` | Set to true to use `host/bucket_name/object` style paths instead of `bucket_name.host/object`. Leave as false for AWS S3 | false |
+
 **In Omnibus installations:**
 
 _The artifacts are stored by default in

doc/administration/uploads.md

@@ -57,6 +57,32 @@ If you don't want to use the local disk where GitLab is installed to store the
 uploads, you can use an object storage provider like AWS S3 instead.
 This configuration relies on valid AWS credentials to be configured already.
 
+### Object Storage Settings
+
+For source installations the following settings are nested under `uploads:` and then `object_store:`. On omnibus installs they are prefixed by `uploads_object_store_`.
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| `enabled` | Enable/disable object storage | `false` |
+| `remote_directory` | The bucket name where Uploads will be stored| |
+| `background_upload` | Set to false to disable automatic upload. Option may be removed once upload is direct to S3 | `true` |
+| `proxy_download` | Set to false to disable proxying all files served. Option allows to reduce egress traffic as this allows clients to download directly from remote storage instead of proxying all data | `false` |
+| `connection` | Various connection options described below | |
+
+#### S3 compatible connection settings
+
+The connection settings match those provided by [Fog](https://github.com/fog), and are as follows:
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| `provider` | Always `AWS` for compatible hosts | AWS |
+| `aws_access_key_id` | AWS credentials, or compatible | |
+| `aws_secret_access_key` | AWS credentials, or compatible | |
+| `region` | AWS region | us-east-1 |
+| `host` | S3 compatible host for when not using AWS, e.g. `localhost` or `storage.example.com` | s3.amazonaws.com |
+| `endpoint` | Can be used when configuring an S3 compatible service such as [Minio](https://www.minio.io), by entering a URL such as `http://127.0.0.1:9000` | (optional) |
+| `path_style` | Set to true to use `host/bucket_name/object` style paths instead of `bucket_name.host/object`. Leave as false for AWS S3 | false |
+
 **In Omnibus installations:**
 
 _The uploads are stored by default in

doc/workflow/lfs/lfs_administration.md

@@ -64,6 +64,7 @@ For source installations the following settings are nested under `lfs:` and then
 | `enabled` | Enable/disable object storage | `false` |
 | `remote_directory` | The bucket name where LFS objects will be stored| |
 | `background_upload` | Set to false to disable automatic upload. Option may be removed once upload is direct to S3 | `true` |
+| `proxy_download` | Set to false to disable proxying all files served. Option allows to reduce egress traffic as this allows clients to download directly from remote storage instead of proxying all data | `false` |
 | `connection` | Various connection options described below | |
 
 #### S3 compatible connection settings

lib/api/helpers.rb

@@ -410,7 +410,7 @@ module API
       )
     end
 
-    def present_file!(path, filename, content_type = 'application/octet-stream')
+    def present_disk_file!(path, filename, content_type = 'application/octet-stream')
       filename ||= File.basename(path)
       header['Content-Disposition'] = "attachment; filename=#{filename}"
       header['Content-Transfer-Encoding'] = 'binary'
@@ -426,15 +426,15 @@ module API
       end
     end
 
-    def present_artifacts!(artifacts_file, direct_download: true)
-      return not_found! unless artifacts_file.exists?
+    def present_carrierwave_file!(file, supports_direct_download: true)
+      return not_found! unless file.exists?
 
-      if artifacts_file.file_storage?
-        present_file!(artifacts_file.path, artifacts_file.filename)
-      elsif direct_download
-        redirect(artifacts_file.url)
+      if file.file_storage?
+        present_disk_file!(file.path, file.filename)
+      elsif supports_direct_download && file.class.direct_download_enabled?
+        redirect(file.url)
       else
-        header(*Gitlab::Workhorse.send_url(artifacts_file.url))
+        header(*Gitlab::Workhorse.send_url(file.url))
         status :ok
         body
       end

lib/api/job_artifacts.rb

@@ -28,7 +28,7 @@ module API
         builds = user_project.latest_successful_builds_for(params[:ref_name])
         latest_build = builds.find_by!(name: params[:job])
 
-        present_artifacts!(latest_build.artifacts_file)
+        present_carrierwave_file!(latest_build.artifacts_file)
       end
 
       desc 'Download the artifacts archive from a job' do
@@ -43,7 +43,7 @@ module API
 
         build = find_build!(params[:job_id])
 
-        present_artifacts!(build.artifacts_file)
+        present_carrierwave_file!(build.artifacts_file)
       end
 
       desc 'Download a specific file from artifacts archive' do

lib/api/jobs.rb

@@ -72,7 +72,7 @@ module API
         present build, with: Entities::Job
       end
 
-      # TODO: We should use `present_file!` and leave this implementation for backward compatibility (when build trace
+      # TODO: We should use `present_disk_file!` and leave this implementation for backward compatibility (when build trace
       #       is saved in the DB instead of file). But before that, we need to consider how to replace the value of
       #       `runners_token` with some mask (like `xxxxxx`) when sending trace file directly by workhorse.
       desc 'Get a trace of a specific job of a project'

lib/api/project_export.rb

@@ -25,7 +25,7 @@ module API
 
         render_api_error!('404 Not found or has expired', 404) unless path
 
-        present_file!(path, File.basename(path), 'application/gzip')
+        present_disk_file!(path, File.basename(path), 'application/gzip')
       end
 
       desc 'Start export' do

lib/api/runner.rb

@@ -249,7 +249,7 @@ module API
       get '/:id/artifacts' do
         job = authenticate_job!
 
-        present_artifacts!(job.artifacts_file, direct_download: params[:direct_download])
+        present_carrierwave_file!(job.artifacts_file, supports_direct_download: params[:direct_download])
       end
     end
   end

lib/api/v3/builds.rb

@@ -85,7 +85,7 @@ module API
 
           build = get_build!(params[:build_id])
 
-          present_artifacts!(build.artifacts_file)
+          present_carrierwave_file!(build.artifacts_file)
         end
 
         desc 'Download the artifacts file from build' do
@@ -102,10 +102,10 @@ module API
           builds = user_project.latest_successful_builds_for(params[:ref_name])
           latest_build = builds.find_by!(name: params[:job])
 
-          present_artifacts!(latest_build.artifacts_file)
+          present_carrierwave_file!(latest_build.artifacts_file)
         end
 
-        # TODO: We should use `present_file!` and leave this implementation for backward compatibility (when build trace
+        # TODO: We should use `present_disk_file!` and leave this implementation for backward compatibility (when build trace
         #       is saved in the DB instead of file). But before that, we need to consider how to replace the value of
         #       `runners_token` with some mask (like `xxxxxx`) when sending trace file directly by workhorse.
         desc 'Get a trace of a specific build of a project'

spec/controllers/concerns/send_file_upload_spec.rb

+require 'spec_helper'
+
+describe SendFileUpload do
+  let(:uploader_class) do
+    Class.new(GitlabUploader) do
+      include ObjectStorage::Concern
+
+      storage_options Gitlab.config.uploads
+
+      private
+
+      # user/:id
+      def dynamic_segment
+        File.join(model.class.to_s.underscore, model.id.to_s)
+      end
+    end
+  end
+
+  let(:controller_class) do
+    Class.new do
+      include SendFileUpload
+    end
+  end
+
+  let(:object) { build_stubbed(:user) }
+  let(:uploader) { uploader_class.new(object, :file) }
+
+  describe '#send_upload' do
+    let(:controller) { controller_class.new }
+    let(:temp_file) { Tempfile.new('test') }
+
+    subject { controller.send_upload(uploader) }
+
+    before do
+      FileUtils.touch(temp_file)
+    end
+
+    after do
+      FileUtils.rm_f(temp_file)
+    end
+
+    context 'when local file is used' do
+      before do
+        uploader.store!(temp_file)
+      end
+
+      it 'sends a file' do
+        expect(controller).to receive(:send_file).with(uploader.path, anything)
+
+        subject
+      end
+    end
+
+    context 'when remote file is used' do
+      before do
+        stub_uploads_object_storage(uploader: uploader_class)
+        uploader.object_store = ObjectStorage::Store::REMOTE
+        uploader.store!(temp_file)
+      end
+
+      context 'and proxying is enabled' do
+        before do
+          allow(Gitlab.config.uploads.object_store).to receive(:proxy_download) { true }
+        end
+
+        it 'sends a file' do
+          subject
+
+          is_expected.to start_with(Gitlab::Workhorse::SEND_DATA_HEADER)
+          is_expected.to end_with(/^send-url:/)
+        end
+      end
+
+      context 'and proxying is disabled' do
+        before do
+          allow(Gitlab.config.uploads.object_store).to receive(:proxy_download) { false }
+        end
+
+        it 'sends a file' do
+          expect(controller).to receive(:redirect_to).with(/#{uploader.path}/)
+
+          subject
+        end
+      end
+    end
+  end
+end