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moby--moby/pkg/httputils/httputils.go

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package httputils
import (
"errors"
"fmt"
"net/http"
"regexp"
"strings"
"github.com/docker/docker/pkg/jsonmessage"
)
var (
headerRegexp = regexp.MustCompile(`^(?:(.+)/(.+?))\((.+)\).*$`)
errInvalidHeader = errors.New("Bad header, should be in format `docker/version (platform)`")
)
// 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) {
matches := headerRegexp.FindStringSubmatch(hdr)
if len(matches) != 4 {
return nil, errInvalidHeader
}
return &ServerHeader{
App: strings.TrimSpace(matches[1]),
Ver: strings.TrimSpace(matches[2]),
OS: strings.TrimSpace(matches[3]),
}, nil
}