56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package httputils
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import (
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"errors"
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"fmt"
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"net/http"
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"regexp"
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"strings"
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"github.com/docker/docker/pkg/jsonmessage"
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)
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var (
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headerRegexp = regexp.MustCompile(`^(?:(.+)/(.+?))\((.+)\).*$`)
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errInvalidHeader = errors.New("Bad header, should be in format `docker/version (platform)`")
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)
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// Download requests a given URL and returns an io.Reader.
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func Download(url string) (resp *http.Response, err error) {
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if resp, err = http.Get(url); err != nil {
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return nil, err
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}
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if resp.StatusCode >= 400 {
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return nil, fmt.Errorf("Got HTTP status code >= 400: %s", resp.Status)
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}
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return resp, nil
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}
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// NewHTTPRequestError returns a JSON response error.
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func NewHTTPRequestError(msg string, res *http.Response) error {
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return &jsonmessage.JSONError{
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Message: msg,
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Code: res.StatusCode,
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}
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}
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// ServerHeader contains the server information.
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type ServerHeader struct {
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App string // docker
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Ver string // 1.8.0-dev
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OS string // windows or linux
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}
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// ParseServerHeader extracts pieces from an HTTP server header
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// which is in the format "docker/version (os)" eg docker/1.8.0-dev (windows).
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func ParseServerHeader(hdr string) (*ServerHeader, error) {
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matches := headerRegexp.FindStringSubmatch(hdr)
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if len(matches) != 4 {
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return nil, errInvalidHeader
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}
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return &ServerHeader{
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App: strings.TrimSpace(matches[1]),
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Ver: strings.TrimSpace(matches[2]),
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OS: strings.TrimSpace(matches[3]),
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}, nil
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}
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