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moby--moby/pkg/httputils/httputils.go
Lei Jitang 27a8f9937e Enable golint part of #14756
pkg/broadcastwriter
pkg/graphdb
pkg/httputils
pkg/ioutils

Signed-off-by: Lei Jitang <leijitang@huawei.com>
2015-08-03 09:45:05 +08:00

59 lines
1.5 KiB
Go

package httputils
import (
"errors"
"fmt"
"net/http"
"regexp"
"strings"
"github.com/docker/docker/pkg/jsonmessage"
)
// Download requests a given URL and returns an io.Reader.
func Download(url string) (resp *http.Response, err error) {
if resp, err = http.Get(url); err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("Got HTTP status code >= 400: %s", resp.Status)
}
return resp, nil
}
// NewHTTPRequestError returns a JSON response error.
func NewHTTPRequestError(msg string, res *http.Response) error {
return &jsonmessage.JSONError{
Message: msg,
Code: res.StatusCode,
}
}
// ServerHeader contains the server information.
type ServerHeader struct {
App string // docker
Ver string // 1.8.0-dev
OS string // windows or linux
}
// ParseServerHeader extracts pieces from an HTTP server header
// which is in the format "docker/version (os)" eg docker/1.8.0-dev (windows).
func ParseServerHeader(hdr string) (*ServerHeader, error) {
re := regexp.MustCompile(`.*\((.+)\).*$`)
r := &ServerHeader{}
if matches := re.FindStringSubmatch(hdr); matches != nil {
r.OS = matches[1]
parts := strings.Split(hdr, "/")
if len(parts) != 2 {
return nil, errors.New("Bad header: '/' missing")
}
r.App = parts[0]
v := strings.Split(parts[1], " ")
if len(v) != 2 {
return nil, errors.New("Bad header: Expected single space")
}
r.Ver = v[0]
return r, nil
}
return nil, errors.New("Bad header: Failed regex match")
}