Function FromQuery

versioning/version.go:60–73

FromQuery is a simple helper which tries to set the version constraint from a given URL Query Parameter. The X-Api-Version is still valid.

(urlQueryParameterName string, defaultVersion string)

// set the version constraint from a given URL Query Parameter.
// The X-Api-Version is still valid.
func FromQuery(urlQueryParameterName string, defaultVersion string) context.Handler {
	return func(ctx *context.Context) {
		version := ctx.URLParam(urlQueryParameterName)
		if version == "" {
			version = defaultVersion
		}

		if version != "" {
			SetVersion(ctx, version)
		}

		ctx.Next()
	}
}

// If reports whether the "got" matches the "expected" one.
// the "expected" can be a constraint like ">=1.0.0 <2.0.0".