Migrate config to KV data format (#8392)

- adding oauth support to MinIO browser (#8400) by @kanagaraj
- supports multi-line get/set/del for all config fields
- add support for comments, allow toggle
- add extensive validation of config before saving
- support MinIO browser to support proper claims, using STS tokens
- env support for all config parameters, legacy envs are also
  supported with all documentation now pointing to latest ENVs
- preserve accessKey/secretKey from FS mode setups
- add history support implements three APIs
  - ClearHistory
  - RestoreHistory
  - ListHistory
- add help command support for each config parameters
- all the bug fixes after migration to KV, and other bug
  fixes encountered during testing.

pkg/event/target/webhook.go

@@ -37,10 +37,25 @@ import (
 	xnet "github.com/minio/minio/pkg/net"
 )
 
+// Webhook constants
+const (
+	WebhookEndpoint   = "endpoint"
+	WebhookAuthToken  = "auth_token"
+	WebhookQueueDir   = "queue_dir"
+	WebhookQueueLimit = "queue_limit"
+
+	EnvWebhookState      = "MINIO_NOTIFY_WEBHOOK_STATE"
+	EnvWebhookEndpoint   = "MINIO_NOTIFY_WEBHOOK_ENDPOINT"
+	EnvWebhookAuthToken  = "MINIO_NOTIFY_WEBHOOK_AUTH_TOKEN"
+	EnvWebhookQueueDir   = "MINIO_NOTIFY_WEBHOOK_QUEUE_DIR"
+	EnvWebhookQueueLimit = "MINIO_NOTIFY_WEBHOOK_QUEUE_LIMIT"
+)
+
 // WebhookArgs - Webhook target arguments.
 type WebhookArgs struct {
 	Enable     bool           `json:"enable"`
 	Endpoint   xnet.URL       `json:"endpoint"`
+	AuthToken  string         `json:"authToken"`
 	RootCAs    *x509.CertPool `json:"-"`
 	QueueDir   string         `json:"queueDir"`
 	QueueLimit uint64         `json:"queueLimit"`
@@ -114,6 +129,10 @@ func (target *WebhookTarget) send(eventData event.Event) error {
 		return err
 	}
 
+	if target.args.AuthToken != "" {
+		req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
+	}
+
 	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := target.httpClient.Do(req)
@@ -172,15 +191,15 @@ func (target *WebhookTarget) Close() error {
 }
 
 // NewWebhookTarget - creates new Webhook target.
-func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})) *WebhookTarget {
+func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{})) (*WebhookTarget, error) {
 
 	var store Store
 
 	if args.QueueDir != "" {
 		queueDir := filepath.Join(args.QueueDir, storePrefix+"-webhook-"+id)
 		store = NewQueueStore(queueDir, args.QueueLimit)
-		if oErr := store.Open(); oErr != nil {
-			return nil
+		if err := store.Open(); err != nil {
+			return nil, err
 		}
 	}
 
@@ -209,5 +228,5 @@ func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, logge
 		go sendEvents(target, eventKeyCh, doneCh, loggerOnce)
 	}
 
-	return target
+	return target, nil
 }