mirror of
https://github.com/genuinetools/reg.git
synced 2024-08-20 13:50:23 -04:00
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// Package useragent provides helper functions to pack
|
|
// version information into a single User-Agent header.
|
|
package useragent // import "github.com/docker/docker/pkg/useragent"
|
|
|
|
import (
|
|
"strings"
|
|
)
|
|
|
|
// VersionInfo is used to model UserAgent versions.
|
|
type VersionInfo struct {
|
|
Name string
|
|
Version string
|
|
}
|
|
|
|
func (vi *VersionInfo) isValid() bool {
|
|
const stopChars = " \t\r\n/"
|
|
name := vi.Name
|
|
vers := vi.Version
|
|
if len(name) == 0 || strings.ContainsAny(name, stopChars) {
|
|
return false
|
|
}
|
|
if len(vers) == 0 || strings.ContainsAny(vers, stopChars) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// AppendVersions converts versions to a string and appends the string to the string base.
|
|
//
|
|
// Each VersionInfo will be converted to a string in the format of
|
|
// "product/version", where the "product" is get from the name field, while
|
|
// version is get from the version field. Several pieces of version information
|
|
// will be concatenated and separated by space.
|
|
//
|
|
// Example:
|
|
// AppendVersions("base", VersionInfo{"foo", "1.0"}, VersionInfo{"bar", "2.0"})
|
|
// results in "base foo/1.0 bar/2.0".
|
|
func AppendVersions(base string, versions ...VersionInfo) string {
|
|
if len(versions) == 0 {
|
|
return base
|
|
}
|
|
|
|
verstrs := make([]string, 0, 1+len(versions))
|
|
if len(base) > 0 {
|
|
verstrs = append(verstrs, base)
|
|
}
|
|
|
|
for _, v := range versions {
|
|
if !v.isValid() {
|
|
continue
|
|
}
|
|
verstrs = append(verstrs, v.Name+"/"+v.Version)
|
|
}
|
|
return strings.Join(verstrs, " ")
|
|
}
|