46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
package middleware
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import (
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"fmt"
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"net/http"
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"runtime"
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"github.com/docker/docker/api/server/httputils"
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"github.com/docker/docker/pkg/version"
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"golang.org/x/net/context"
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)
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type badRequestError struct {
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error
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}
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func (badRequestError) HTTPErrorStatusCode() int {
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return http.StatusBadRequest
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}
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// NewVersionMiddleware creates a new Version middleware.
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func NewVersionMiddleware(versionCheck string, defaultVersion, minVersion version.Version) Middleware {
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serverVersion := version.Version(versionCheck)
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return func(handler httputils.APIFunc) httputils.APIFunc {
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return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
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apiVersion := version.Version(vars["version"])
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if apiVersion == "" {
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apiVersion = defaultVersion
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}
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if apiVersion.GreaterThan(defaultVersion) {
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return badRequestError{fmt.Errorf("client is newer than server (client API version: %s, server API version: %s)", apiVersion, defaultVersion)}
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}
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if apiVersion.LessThan(minVersion) {
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return badRequestError{fmt.Errorf("client version %s is too old. Minimum supported API version is %s, please upgrade your client to a newer version", apiVersion, minVersion)}
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}
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header := fmt.Sprintf("Docker/%s (%s)", serverVersion, runtime.GOOS)
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w.Header().Set("Server", header)
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ctx = context.WithValue(ctx, httputils.APIVersionKey, apiVersion)
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return handler(ctx, w, r, vars)
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}
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}
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}
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