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registry.go
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registry.go
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package registry
import (
"crypto/tls"
"fmt"
"log"
"net/http"
"strings"
)
type LogfCallback func(format string, args ...interface{})
/*
* Discard log messages silently.
*/
func Quiet(format string, args ...interface{}) {
/* discard logs */
}
/*
* Pass log messages along to Go's "log" module.
*/
func Log(format string, args ...interface{}) {
log.Printf(format, args...)
}
type OptionFunc func(r *Registry)
func SetLogf(logf LogfCallback) OptionFunc {
return func(r *Registry) {
r.logf = logf
}
}
func SetHttpClient(client *http.Client) OptionFunc {
return func(r *Registry) {
r.client = client
}
}
type Registry struct {
url string
client *http.Client
logf LogfCallback
}
type Option struct {
Logf LogfCallback
}
/*
* Create a new Registry with the given URL and credentials, then Ping()s it
* before returning it to verify that the registry is available.
*
* You can, alternately, construct a Registry manually by populating the fields.
* This passes http.DefaultTransport to WrapTransport when creating the
* http.Client.
*/
func New(registryURL, username, password string, options ...OptionFunc) (*Registry, error) {
transport := http.DefaultTransport
return newFromTransport(registryURL, username, password, transport, options...)
}
/*
* Create a new Registry, as with New, using an http.Transport that disables
* SSL certificate verification.
*/
func NewInsecure(registryURL, username, password string, options ...OptionFunc) (*Registry, error) {
transport := &http.Transport{
TLSClientConfig: &tls.Config{
// TODO: Why?
InsecureSkipVerify: true, //nolint:gosec
},
}
return newFromTransport(registryURL, username, password, transport, options...)
}
/*
* Given an existing http.RoundTripper such as http.DefaultTransport, build the
* transport stack necessary to authenticate to the Docker registry API. This
* adds in support for OAuth bearer tokens and HTTP Basic auth, and sets up
* error handling this library relies on.
*/
func WrapTransport(transport http.RoundTripper, url, username, password string) http.RoundTripper {
tokenTransport := &TokenTransport{
Transport: transport,
Username: username,
Password: password,
}
basicAuthTransport := &BasicTransport{
Transport: tokenTransport,
URL: url,
Username: username,
Password: password,
}
errorTransport := &ErrorTransport{
Transport: basicAuthTransport,
}
return errorTransport
}
func newFromTransport(registryURL, username, password string, transport http.RoundTripper, options ...OptionFunc) (*Registry, error) {
url := strings.TrimSuffix(registryURL, "/")
transport = WrapTransport(transport, url, username, password)
registry := &Registry{
url: url,
client: &http.Client{
Transport: transport,
},
logf: Log,
}
for _, optionFunc := range options {
optionFunc(registry)
}
if err := registry.Ping(); err != nil {
return nil, err
}
return registry, nil
}
func (r *Registry) generateUrl(pathTemplate string, args ...interface{}) string {
pathSuffix := fmt.Sprintf(pathTemplate, args...)
url := fmt.Sprintf("%s%s", r.url, pathSuffix)
return url
}
func (r *Registry) Ping() error {
url := r.generateUrl("/v2/")
r.logf("registry.ping url=%s", url)
resp, err := r.client.Get(url)
if resp != nil {
defer resp.Body.Close()
}
return err
}