/
provider.go
112 lines (94 loc) · 3.2 KB
/
provider.go
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/*
Inspired by
- https://github.com/kubernetes/kubernetes/blob/master/pkg/credentialprovider/provider.go
*/
package credentialprovider
import (
"os"
"reflect"
"sync"
"time"
dockertypes "github.com/docker/docker/api/types"
"github.com/golang/glog"
)
// DockerConfigProvider is the interface that registered extensions implement
// to materialize 'dockercfg' credentials.
type DockerConfigProvider interface {
// Enabled returns true if the config provider is enabled.
// Implementations can be blocking - e.g. metadata server unavailable.
Enabled() bool
// Provide returns docker configuration.
// Implementations can be blocking - e.g. metadata server unavailable.
Provide() DockerConfig
// LazyProvide() gets called after URL matches have been performed, so the
// location used as the key in DockerConfig would be redundant.
LazyProvide() *DockerConfigEntry
}
func LazyProvide(creds LazyAuthConfiguration) dockertypes.AuthConfig {
if creds.Provider != nil {
entry := *creds.Provider.LazyProvide()
return DockerConfigEntryToLazyAuthConfiguration(entry).AuthConfig
} else {
return creds.AuthConfig
}
}
// A DockerConfigProvider that simply reads the .dockercfg file
type defaultDockerConfigProvider struct{}
// init registers our default provider, which simply reads the .dockercfg file.
func init() {
RegisterCredentialProvider(".dockercfg",
&CachingDockerConfigProvider{
Provider: &defaultDockerConfigProvider{},
Lifetime: 5 * time.Minute,
})
}
// CachingDockerConfigProvider implements DockerConfigProvider by composing
// with another DockerConfigProvider and caching the DockerConfig it provides
// for a pre-specified lifetime.
type CachingDockerConfigProvider struct {
Provider DockerConfigProvider
Lifetime time.Duration
// cache fields
cacheDockerConfig DockerConfig
expiration time.Time
mu sync.Mutex
}
// Enabled implements dockerConfigProvider
func (d *defaultDockerConfigProvider) Enabled() bool {
return true
}
// Provide implements dockerConfigProvider
func (d *defaultDockerConfigProvider) Provide() DockerConfig {
// Read the standard Docker credentials from .dockercfg
if cfg, err := ReadDockerConfigFile(); err == nil {
return cfg
} else if !os.IsNotExist(err) {
glog.V(4).Infof("Unable to parse Docker config file: %v", err)
}
return DockerConfig{}
}
// LazyProvide implements dockerConfigProvider. Should never be called.
func (d *defaultDockerConfigProvider) LazyProvide() *DockerConfigEntry {
return nil
}
// Enabled implements dockerConfigProvider
func (d *CachingDockerConfigProvider) Enabled() bool {
return d.Provider.Enabled()
}
// LazyProvide implements dockerConfigProvider. Should never be called.
func (d *CachingDockerConfigProvider) LazyProvide() *DockerConfigEntry {
return nil
}
// Provide implements dockerConfigProvider
func (d *CachingDockerConfigProvider) Provide() DockerConfig {
d.mu.Lock()
defer d.mu.Unlock()
// If the cache hasn't expired, return our cache
if time.Now().Before(d.expiration) {
return d.cacheDockerConfig
}
glog.V(2).Infof("Refreshing cache for provider: %v", reflect.TypeOf(d.Provider).String())
d.cacheDockerConfig = d.Provider.Provide()
d.expiration = time.Now().Add(d.Lifetime)
return d.cacheDockerConfig
}