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resolver.go
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resolver.go
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package plugin
import (
"fmt"
"log"
"sort"
"strings"
"sync"
plugin_v1 "github.com/cyberark/secretless-broker/internal/plugin/v1"
config_v2 "github.com/cyberark/secretless-broker/pkg/secretless/config/v2"
)
// Resolver is used to instantiate providers and resolve credentials
type Resolver struct {
EventNotifier plugin_v1.EventNotifier
ProviderFactories map[string]func(plugin_v1.ProviderOptions) (plugin_v1.Provider, error)
Providers map[string]plugin_v1.Provider
LogFatalf func(string, ...interface{})
}
// NewResolver instantiates providers based on the name and ProviderOptions
func NewResolver(
providerFactories map[string]func(plugin_v1.ProviderOptions) (plugin_v1.Provider, error),
eventNotifier plugin_v1.EventNotifier,
LogFatalFunc func(string, ...interface{}),
) plugin_v1.Resolver {
if LogFatalFunc == nil {
LogFatalFunc = log.Fatalf
}
return &Resolver{
EventNotifier: eventNotifier,
LogFatalf: LogFatalFunc,
ProviderFactories: providerFactories,
Providers: make(map[string]plugin_v1.Provider),
}
}
// Provider finds or creates a named provider.
func (resolver *Resolver) Provider(name string) (provider plugin_v1.Provider, err error) {
mutex := &sync.Mutex{}
mutex.Lock()
defer mutex.Unlock()
if provider = resolver.Providers[name]; provider != nil {
return
}
// If we don't know what this provider is, it's a critical error
if _, ok := resolver.ProviderFactories[name]; !ok {
resolver.LogFatalf("ERROR: Provider '%s' cannot be found", name)
}
providerOptions := plugin_v1.ProviderOptions{
Name: name,
}
providerFactory := resolver.ProviderFactories[name]
log.Printf("Instantiating provider '%s'", name)
provider, err = providerFactory(providerOptions)
if err != nil {
return nil, err
}
resolver.Providers[name] = provider
return
}
func (resolver *Resolver) resolveForProvider(
providerID string,
credentials []*config_v2.Credential,
) (plugin_v1.Provider, map[string]plugin_v1.ProviderResponse, string) {
provider, err := resolver.Provider(providerID)
if err != nil {
resolver.LogFatalf("ERROR: Provider '%s' could not be used! %v", providerID, err)
}
// Create secretIds slice and credentialBySecretId map
secretIds := make([]string, len(credentials))
for idx, cred := range credentials {
secretIds[idx] = cred.Get
}
// Resolves all credentials for current provider
var hasErrors bool
var providerErrStrings []string
providerResponses, err := provider.GetValues(secretIds...)
if err != nil {
hasErrors = true
providerErrStrings = append(
providerErrStrings,
err.Error(),
)
}
// Collect errors from provider responses
for _, providerResponse := range providerResponses {
if providerResponse.Error != nil {
hasErrors = true
providerErrStrings = append(
providerErrStrings,
providerResponse.Error.Error(),
)
continue
}
}
if hasErrors {
// Sort the error strings to provide deterministic output
sort.Strings(providerErrStrings)
errInfo := fmt.Sprintf(
"ERROR: Resolving credentials from provider '%s' failed: %v",
provider.GetName(),
strings.Join(providerErrStrings, ", "),
)
return nil, nil, errInfo
}
return provider, providerResponses, ""
}
// Resolve accepts n list of Providers and a list of Credentials and
// attempts to obtain the value of each Credential from the appropriate Provider.
func (resolver *Resolver) Resolve(credentials []*config_v2.Credential) (map[string][]byte, error) {
if len(credentials) == 0 {
resolver.LogFatalf("ERROR! Credentials not defined in Resolve call!")
}
result := make(map[string][]byte)
errorStrings := make([]string, 0, len(credentials))
var err error
// Group credentials by provider
credentialsByProvider := groupCredentialsByProvider(credentials)
// Resolve credentials by provider
for providerID, credentialsForProvider := range credentialsByProvider {
provider, providerResponses, errStr := resolver.resolveForProvider(
providerID,
credentialsForProvider,
)
if errStr != "" {
log.Println(errStr)
errorStrings = append(errorStrings, errStr)
continue
}
// Set provider responses on result map before returning
for _, credential := range credentialsForProvider {
credentialName := credential.Name
secretValue := providerResponses[credential.Get].Value
result[credentialName] = secretValue
if resolver.EventNotifier != nil {
resolver.EventNotifier.ResolveCredential(
provider,
credentialName,
secretValue,
)
}
}
}
err = nil
if len(errorStrings) > 0 {
// Sort the error strings to provide deterministic output
sort.Strings(errorStrings)
err = fmt.Errorf(strings.Join(errorStrings, "\n"))
}
return result, err
}
func groupCredentialsByProvider(
credentials []*config_v2.Credential,
) map[string][]*config_v2.Credential {
credentialsByProvider := make(map[string][]*config_v2.Credential)
for _, credential := range credentials {
credentialsByProvider[credential.From] = append(
credentialsByProvider[credential.From],
credential,
)
}
return credentialsByProvider
}