123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package omaha
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import (
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"fmt"
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"net/http"
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"path"
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"github.com/blang/semver"
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)
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const pkg_prefix = "/packages/"
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// trivialUpdater always responds with the given Update.
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type trivialUpdater struct {
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UpdaterStub
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Update
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}
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func (tu *trivialUpdater) CheckUpdate(req *Request, app *AppRequest) (*Update, error) {
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if len(tu.Manifest.Packages) == 0 {
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return nil, NoUpdate
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}
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v1, err := semver.Make(app.Version)
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if err != nil {
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return nil, err
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}
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v2, err := semver.Make(tu.Manifest.Version)
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if err != nil {
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return nil, err
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}
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if v1.LT(v2) {
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return &tu.Update, nil
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}
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return nil, NoUpdate
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}
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// trivialHandler serves up a single file.
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type trivialHandler struct {
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Path string
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}
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func (th *trivialHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if th.Path == "" {
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http.NotFound(w, r)
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}
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http.ServeFile(w, r, th.Path)
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}
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// TrivialServer is an extremely basic Omaha server that ignores all
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// incoming metadata, always responding with the same update response.
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// The update is constructed by calling AddPackage one or more times.
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type TrivialServer struct {
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*Server
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tu trivialUpdater
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}
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func NewTrivialServer(addr string) (*TrivialServer, error) {
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ts := TrivialServer{
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tu: trivialUpdater{
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Update: Update{
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URL: URL{CodeBase: pkg_prefix},
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},
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},
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}
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s, err := NewServer(addr, &ts.tu)
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if err != nil {
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return nil, err
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}
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ts.Server = s
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return &ts, nil
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}
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// AddPackage adds a new file to the update response.
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// file is the local filesystem path, name is the final URL component.
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func (ts *TrivialServer) AddPackage(file, name string) error {
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// name may not include any path components
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if path.Base(name) != name || name[0] == '.' {
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return fmt.Errorf("invalid package name %q", name)
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}
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pkg, err := ts.tu.Manifest.AddPackageFromPath(file)
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if err != nil {
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return err
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}
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pkg.Name = name
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// Insert the update_engine style postinstall action if
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// this is the first (and probably only) package.
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if len(ts.tu.Manifest.Actions) == 0 {
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act := ts.tu.Manifest.AddAction("postinstall")
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act.DisablePayloadBackoff = true
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act.SHA256 = pkg.SHA256
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}
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ts.Mux.Handle(pkg_prefix+name, &trivialHandler{file})
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return nil
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}
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// SetVersion sets the manifest's version with the provided one.
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func (ts *TrivialServer) SetVersion(version string) {
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ts.tu.Manifest.Version = version
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}
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