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cipher_manager.go
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/
cipher_manager.go
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package security
import (
"fmt"
"os"
"github.com/go-chassis/go-chassis/core/lager"
"github.com/go-chassis/go-chassis/pkg/goplugin"
)
const pluginSuffix = ".so"
//CipherPlugins is a map
var cipherPlugins map[string]func() Cipher
//InstallCipherPlugin is a function
func InstallCipherPlugin(name string, f func() Cipher) {
cipherPlugins[name] = f
}
//GetCipherNewFunc is a function
func GetCipherNewFunc(name string) (func() Cipher, error) {
if f, ok := cipherPlugins[name]; ok {
return f, nil
}
lager.Logger.Debugf("try to load cipher [%s] from go plugin", name)
f, err := loadCipherFromPlugin(name)
if err == nil {
cipherPlugins[name] = f
return f, nil
}
if !os.IsNotExist(err) {
return nil, err
}
return nil, fmt.Errorf("unkown cipher plugin [%s]", name)
}
func loadCipherFromPlugin(name string) (func() Cipher, error) {
p, err := goplugin.LoadPlugin(name + pluginSuffix)
if err != nil {
return nil, err
}
c, err := p.Lookup("Cipher")
if err != nil {
return nil, err
}
customCipher := c.(Cipher)
f := func() Cipher {
return customCipher
}
return f, nil
}
func init() {
cipherPlugins = make(map[string]func() Cipher)
}