134 lines
3.7 KiB
Go
134 lines
3.7 KiB
Go
// Copyright 2015 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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"encoding/xml"
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"log"
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"net/http"
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)
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type OmahaHandler struct {
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Updater
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}
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func (o *OmahaHandler) ServeHTTP(w http.ResponseWriter, httpReq *http.Request) {
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if httpReq.Method != "POST" {
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log.Printf("omaha: Unexpected HTTP method: %s", httpReq.Method)
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http.Error(w, "Expected a POST", http.StatusBadRequest)
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return
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}
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// A request over 1M in size is certainly bogus.
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reader := http.MaxBytesReader(w, httpReq.Body, 1024*1024)
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decoder := xml.NewDecoder(reader)
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var omahaReq Request
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if err := decoder.Decode(&omahaReq); err != nil {
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log.Printf("omaha: Failed decoding XML: %v", err)
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http.Error(w, "Invalid XML", http.StatusBadRequest)
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return
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}
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if omahaReq.Protocol != "3.0" {
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log.Printf("omaha: Unexpected protocol: %q", omahaReq.Protocol)
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http.Error(w, "Omaha 3.0 Required", http.StatusBadRequest)
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return
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}
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httpStatus := 0
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omahaResp := NewResponse()
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for _, appReq := range omahaReq.Apps {
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appResp := o.serveApp(omahaResp, httpReq, &omahaReq, appReq)
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if appResp.Status == AppOK {
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// HTTP is ok if any app is ok.
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httpStatus = http.StatusOK
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} else if httpStatus == 0 {
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// If no app is ok HTTP will use the first error.
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if appResp.Status == AppInternalError {
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httpStatus = http.StatusInternalServerError
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} else {
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httpStatus = http.StatusBadRequest
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}
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}
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}
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if httpStatus == 0 {
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httpStatus = http.StatusBadRequest
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}
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w.Header().Set("Content-Type", "text/xml; charset=utf-8")
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w.WriteHeader(httpStatus)
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if _, err := w.Write([]byte(xml.Header)); err != nil {
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log.Printf("omaha: Failed writing response: %v", err)
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return
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}
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encoder := xml.NewEncoder(w)
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encoder.Indent("", "\t")
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if err := encoder.Encode(omahaResp); err != nil {
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log.Printf("omaha: Failed encoding response: %v", err)
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}
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}
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func (o *OmahaHandler) serveApp(omahaResp *Response, httpReq *http.Request, omahaReq *Request, appReq *AppRequest) *AppResponse {
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if err := o.CheckApp(omahaReq, appReq); err != nil {
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if appStatus, ok := err.(AppStatus); ok {
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return omahaResp.AddApp(appReq.Id, appStatus)
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}
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log.Printf("omaha: CheckApp failed: %v", err)
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return omahaResp.AddApp(appReq.Id, AppInternalError)
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}
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appResp := omahaResp.AddApp(appReq.Id, AppOK)
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if appReq.UpdateCheck != nil {
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o.checkUpdate(appResp, httpReq, omahaReq, appReq)
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}
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if appReq.Ping != nil {
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o.Ping(omahaReq, appReq)
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appResp.AddPing()
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}
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for _, event := range appReq.Events {
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o.Event(omahaReq, appReq, event)
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appResp.AddEvent()
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}
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return appResp
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}
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func (o *OmahaHandler) checkUpdate(appResp *AppResponse, httpReq *http.Request, omahaReq *Request, appReq *AppRequest) {
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update, err := o.CheckUpdate(omahaReq, appReq)
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if err != nil {
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if updateStatus, ok := err.(UpdateStatus); ok {
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appResp.AddUpdateCheck(updateStatus)
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} else {
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log.Printf("omaha: CheckUpdate failed: %v", err)
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appResp.AddUpdateCheck(UpdateInternalError)
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}
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} else if update != nil {
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u := appResp.AddUpdateCheck(UpdateOK)
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fillUpdate(u, update, httpReq)
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} else {
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appResp.AddUpdateCheck(NoUpdate)
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}
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}
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func fillUpdate(u *UpdateResponse, update *Update, httpReq *http.Request) {
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u.URLs = update.URLs([]string{"http://" + httpReq.Host})
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u.Manifest = &update.Manifest
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}
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