mirror of
https://github.com/dutchcoders/transfer.sh.git
synced 2025-01-15 21:20:19 +01:00
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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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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/*
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Package proxyutil provides functionality for building proxies.
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*/
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package proxyutil
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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// NewResponse builds new HTTP responses.
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// If body is nil, an empty byte.Buffer will be provided to be consistent with
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// the guarantees provided by http.Transport and http.Client.
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func NewResponse(code int, body io.Reader, req *http.Request) *http.Response {
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if body == nil {
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body = &bytes.Buffer{}
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}
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rc, ok := body.(io.ReadCloser)
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if !ok {
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rc = ioutil.NopCloser(body)
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}
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res := &http.Response{
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StatusCode: code,
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Status: fmt.Sprintf("%d %s", code, http.StatusText(code)),
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Proto: "HTTP/1.1",
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ProtoMajor: 1,
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ProtoMinor: 1,
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Header: http.Header{},
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Body: rc,
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Request: req,
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}
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if req != nil {
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res.Close = req.Close
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res.Proto = req.Proto
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res.ProtoMajor = req.ProtoMajor
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res.ProtoMinor = req.ProtoMinor
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}
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return res
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}
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// Warning adds an error to the Warning header in the format: 199 "martian"
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// "error message" "date".
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func Warning(header http.Header, err error) {
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date := header.Get("Date")
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if date == "" {
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date = time.Now().Format(http.TimeFormat)
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}
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w := fmt.Sprintf(`199 "martian" %q %q`, err.Error(), date)
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header.Add("Warning", w)
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}
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// GetRangeStart returns the byte index of the start of the range, if it has one.
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// Returns 0 if the range header is absent, and -1 if the range header is invalid or
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// has multi-part ranges.
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func GetRangeStart(res *http.Response) int64 {
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if res.StatusCode != http.StatusPartialContent {
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return 0
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}
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if strings.Contains(res.Header.Get("Content-Type"), "multipart/byteranges") {
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return -1
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}
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re := regexp.MustCompile(`bytes (\d+)-\d+/\d+`)
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matchSlice := re.FindStringSubmatch(res.Header.Get("Content-Range"))
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if len(matchSlice) < 2 {
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return -1
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}
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num, err := strconv.ParseInt(matchSlice[1], 10, 64)
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if err != nil {
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return -1
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}
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return num
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}
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