go-omaha/omaha/client/client.go

155 lines
4.1 KiB
Go
Raw Normal View History

// Copyright 2017 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package client provides a general purpose Omaha update client implementation.
package client
import (
"errors"
"fmt"
"net/url"
"github.com/satori/go.uuid"
)
// Client supports managing multiple apps using a single server.
type Client struct {
apiEndpoint string
clientVersion string
userID string
sessionID string
isMachine bool
apps map[string]*AppClient
}
// AppClient supports managing a single application.
type AppClient struct {
*Client
appID string
track string
version string
}
// New creates an omaha client for updating one or more applications.
// userID must be a persistent unique identifier of this update client.
func New(serverURL, userID string) (*Client, error) {
if userID == "" {
return nil, errors.New("omaha: empty user identifier")
}
c := &Client{
clientVersion: "go-omaha",
userID: userID,
sessionID: uuid.NewV4().String(),
apps: make(map[string]*AppClient),
}
if err := c.SetServerURL(serverURL); err != nil {
return nil, err
}
return c, nil
}
// SetServerURL changes the Omaha server this client talks to.
// If the URL does not include a path component /v1/update/ is assumed.
func (c *Client) SetServerURL(serverURL string) error {
u, err := url.Parse(serverURL)
if err != nil {
return fmt.Errorf("omaha: invalid server URL: %v", err)
}
if u.Scheme != "http" && u.Scheme != "https" {
return fmt.Errorf("omaha: invalid server protocol: %s", u)
}
if u.Host == "" {
return fmt.Errorf("omaha: invalid server host: %s", u)
}
if u.Path == "" || u.Path == "/" {
u.Path = "/v1/update/"
}
c.apiEndpoint = u.String()
return nil
}
// SetClientVersion sets the identifier of this updater application.
// e.g. "update_engine-0.1.0". Default is "go-omaha".
func (c *Client) SetClientVersion(clientVersion string) {
c.clientVersion = clientVersion
}
// AppClient gets the application client for the given application ID.
func (c *Client) AppClient(appID string) (*AppClient, error) {
if app, ok := c.apps[appID]; ok {
return app, nil
}
return nil, fmt.Errorf("omaha: missing app client %q", appID)
}
// NewAppClient creates a new application client.
func (c *Client) NewAppClient(appID, appVersion string) (*AppClient, error) {
if _, ok := c.apps[appID]; ok {
return nil, fmt.Errorf("omaha: duplicate app client %q", appID)
}
ac := &AppClient{
Client: c,
appID: appID,
}
c.apps[appID] = ac
return ac, nil
}
// NewAppClient creates a single application client.
// Shorthand for New(serverURL, userID).NewAppClient(appID, appVersion).
func NewAppClient(serverURL, userID, appID, appVersion string) (*AppClient, error) {
c, err := New(serverURL, userID)
if err != nil {
return nil, err
}
ac, err := c.NewAppClient(appID, appVersion)
if err := ac.SetVersion(appVersion); err != nil {
return nil, err
}
return ac, nil
}
// SetVersion changes the application version.
func (ac *AppClient) SetVersion(version string) error {
if version == "" {
return errors.New("omaha: empty application version")
}
ac.version = version
return nil
}
// SetTrack sets the application update track or group.
// This is a update_engine/Core Update protocol extension.
func (ac *AppClient) SetTrack(track string) error {
// Although track is an omaha extension and theoretically not required
// our Core Update server requires track to be set to a valid id/name.
// TODO: deprecate track and use the standard cohort protocol fields.
if track == "" {
return errors.New("omaha: empty application update track/group")
}
ac.track = track
return nil
}