feat(extensions): introduce extension support (#2527)

* wip

* wip: missing repository & tags removal

* feat(registry): private registry management

* style(plugin-details): update view

* wip

* wip

* wip

* feat(plugins): add license info

* feat(plugins): browse feature preview

* feat(registry-configure): add the ability to configure registry management

* style(app): update text in app

* feat(plugins): add plugin version number

* feat(plugins): wip plugin upgrade process

* feat(plugins): wip plugin upgrade

* feat(plugins): add the ability to update a plugin

* feat(plugins): init plugins at startup time

* feat(plugins): add the ability to remove a plugin

* feat(plugins): update to latest plugin definitions

* feat(plugins): introduce plugin-tooltip component

* refactor(app): relocate plugin files to app/plugins

* feat(plugins): introduce PluginDefinitionsURL constant

* feat(plugins): update the flags used by the plugins

* feat(plugins): wip

* feat(plugins): display a label when a plugin has expired

* wip

* feat(registry-creation): update registry creation logic

* refactor(registry-creation): change name/ids for inputs

* feat(api): pass registry type to management configuration

* feat(api): unstrip /v2 in regsitry proxy

* docs(api): add TODO

* feat(store): mockup-1

* feat(store): mockup 2

* feat(store): mockup 2

* feat(store): update mockup-2

* feat(app): add unauthenticated event check

* update gruntfile

* style(support): update support views

* style(support): update product views

* refactor(extensions): refactor plugins to extensions

* feat(extensions): add a deal property

* feat(extensions): introduce ExtensionManager

* style(extensions): update extension details style

* feat(extensions): display license/company when enabling extension

* feat(extensions): update extensions views

* feat(extensions): use ProductId defined in extension schema

* style(app): remove padding left for form section title elements

* style(support): use per host model

* refactor(extensions): multiple refactors related to extensions mecanism

* feat(extensions): update tls file path for registry extension

* feat(extensions): update registry management configuration

* feat(extensions): send license in header to extension proxy

* fix(proxy): fix invalid default loopback address

* feat(extensions): add header X-RegistryManagement-ForceNew for specific operations

* feat(extensions): add the ability to display screenshots

* feat(extensions): center screenshots

* style(extensions): tune style

* feat(extensions-details): open full screen image on click (#2517)

* feat(extension-details): show magnifying glass on images

* feat(extensions): support extension logo

* feat(extensions): update support logos

* refactor(lint): fix lint issues

api/filesystem/filesystem.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 
 	"github.com/portainer/portainer"
+	"github.com/portainer/portainer/archive"
 
 	"io"
 	"os"
@@ -32,8 +33,13 @@ const (
 	PrivateKeyFile = "portainer.key"
 	// PublicKeyFile represents the name on disk of the file containing the public key.
 	PublicKeyFile = "portainer.pub"
+	// BinaryStorePath represents the subfolder where binaries are stored in the file store folder.
+	BinaryStorePath = "bin"
 	// ScheduleStorePath represents the subfolder where schedule files are stored.
 	ScheduleStorePath = "schedules"
+	// ExtensionRegistryManagementStorePath represents the subfolder where files related to the
+	// registry management extension are stored.
+	ExtensionRegistryManagementStorePath = "extensions"
 )
 
 // Service represents a service for managing files and directories.
@@ -65,9 +71,30 @@ func NewService(dataStorePath, fileStorePath string) (*Service, error) {
 		return nil, err
 	}
 
+	err = service.createDirectoryInStore(BinaryStorePath)
+	if err != nil {
+		return nil, err
+	}
+
 	return service, nil
 }
 
+// GetBinaryFolder returns the full path to the binary store on the filesystem
+func (service *Service) GetBinaryFolder() string {
+	return path.Join(service.fileStorePath, BinaryStorePath)
+}
+
+// ExtractExtensionArchive extracts the content of an extension archive
+// specified as raw data into the binary store on the filesystem
+func (service *Service) ExtractExtensionArchive(data []byte) error {
+	err := archive.UnzipArchive(data, path.Join(service.fileStorePath, BinaryStorePath))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // RemoveDirectory removes a directory on the filesystem.
 func (service *Service) RemoveDirectory(directoryPath string) error {
 	return os.RemoveAll(directoryPath)
@@ -99,6 +126,27 @@ func (service *Service) StoreStackFileFromBytes(stackIdentifier, fileName string
 	return path.Join(service.fileStorePath, stackStorePath), nil
 }
 
+// StoreRegistryManagementFileFromBytes creates a subfolder in the
+// ExtensionRegistryManagementStorePath and stores a new file from bytes.
+// It returns the path to the folder where the file is stored.
+func (service *Service) StoreRegistryManagementFileFromBytes(folder, fileName string, data []byte) (string, error) {
+	extensionStorePath := path.Join(ExtensionRegistryManagementStorePath, folder)
+	err := service.createDirectoryInStore(extensionStorePath)
+	if err != nil {
+		return "", err
+	}
+
+	file := path.Join(extensionStorePath, fileName)
+	r := bytes.NewReader(data)
+
+	err = service.createFileInStore(file, r)
+	if err != nil {
+		return "", err
+	}
+
+	return path.Join(service.fileStorePath, file), nil
+}
+
 // StoreTLSFileFromBytes creates a folder in the TLSStorePath and stores a new file from bytes.
 // It returns the path to the newly created file.
 func (service *Service) StoreTLSFileFromBytes(folder string, fileType portainer.TLSFileType, data []byte) (string, error) {