72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
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// Copyright 2017 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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"fmt"
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"io"
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"mime"
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"strings"
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)
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// checkContentType verifies the HTTP Content-Type header properly
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// declares the document is XML and UTF-8. Blank is assumed OK.
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func checkContentType(contentType string) error {
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if contentType == "" {
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return nil
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}
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mType, mParams, err := mime.ParseMediaType(contentType)
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if err != nil {
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return err
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}
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if mType != "text/xml" && mType != "application/xml" {
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return fmt.Errorf("unsupported content type %q", mType)
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}
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charset, _ := mParams["charset"]
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if charset != "" && strings.ToLower(charset) != "utf-8" {
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return fmt.Errorf("unsupported content charset %q", charset)
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}
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return nil
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}
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// parseReqOrResp parses Request and Response objects.
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func parseReqOrResp(r io.Reader, v interface{}) error {
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decoder := xml.NewDecoder(r)
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if err := decoder.Decode(v); err != nil {
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return err
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}
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var protocol string
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switch v := v.(type) {
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case *Request:
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protocol = v.Protocol
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case *Response:
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protocol = v.Protocol
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default:
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panic(fmt.Errorf("unexpected type %T", v))
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}
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if protocol != "3.0" {
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return fmt.Errorf("unsupported omaha protocol: %q", protocol)
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}
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return nil
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}
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