72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
// 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 omaha
|
|
|
|
import (
|
|
"encoding/xml"
|
|
"fmt"
|
|
"io"
|
|
"mime"
|
|
"strings"
|
|
)
|
|
|
|
// checkContentType verifies the HTTP Content-Type header properly
|
|
// declares the document is XML and UTF-8. Blank is assumed OK.
|
|
func checkContentType(contentType string) error {
|
|
if contentType == "" {
|
|
return nil
|
|
}
|
|
|
|
mType, mParams, err := mime.ParseMediaType(contentType)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if mType != "text/xml" && mType != "application/xml" {
|
|
return fmt.Errorf("unsupported content type %q", mType)
|
|
}
|
|
|
|
charset, _ := mParams["charset"]
|
|
if charset != "" && strings.ToLower(charset) != "utf-8" {
|
|
return fmt.Errorf("unsupported content charset %q", charset)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// parseReqOrResp parses Request and Response objects.
|
|
func parseReqOrResp(r io.Reader, v interface{}) error {
|
|
decoder := xml.NewDecoder(r)
|
|
if err := decoder.Decode(v); err != nil {
|
|
return err
|
|
}
|
|
|
|
var protocol string
|
|
switch v := v.(type) {
|
|
case *Request:
|
|
protocol = v.Protocol
|
|
case *Response:
|
|
protocol = v.Protocol
|
|
default:
|
|
panic(fmt.Errorf("unexpected type %T", v))
|
|
}
|
|
|
|
if protocol != "3.0" {
|
|
return fmt.Errorf("unsupported omaha protocol: %q", protocol)
|
|
}
|
|
|
|
return nil
|
|
}
|