feat: Implement webhook notifications and admin tools for job management

- Add webhook notification settings to job configuration, allowing users to enable notifications for job success and failure.
- Implement webhook payload structure and authentication using HMAC-SHA256 for secure communication.
- Enhance the admin tools with a log viewer and system management features, including database backup and log file access.
- Update README documentation to include details on webhook integration and admin tools.
- Introduce comprehensive tests for webhook functionality, ensuring correct payload delivery and header validation.
- Add database migrations to support new webhook fields in job configurations.

internal/db/db.go

@@ -122,10 +122,17 @@ type Job struct {
 	Enabled   bool           `gorm:"default:true" form:"enabled"`
 	LastRun   *time.Time
 	NextRun   *time.Time
-	CreatedBy uint
-	User      User `gorm:"foreignkey:CreatedBy"`
-	CreatedAt time.Time
-	UpdatedAt time.Time
+	// Webhook notification fields
+	WebhookEnabled  bool   `gorm:"default:false" form:"webhook_enabled"`
+	WebhookURL      string `form:"webhook_url"`
+	WebhookSecret   string `form:"webhook_secret"`
+	WebhookHeaders  string `form:"webhook_headers"` // JSON-encoded headers
+	NotifyOnSuccess bool   `gorm:"default:true" form:"notify_on_success"`
+	NotifyOnFailure bool   `gorm:"default:true" form:"notify_on_failure"`
+	CreatedBy       uint
+	User            User `gorm:"foreignkey:CreatedBy"`
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
 }
 
 // GetConfigIDsList returns the list of config IDs as integers

internal/db/migrations/add_webhook_support.go

@@ -0,0 +1,61 @@
+package migrations
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// AddWebhookSupport adds webhook notification fields to the jobs table
+func AddWebhookSupport() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20240618_add_webhook_support",
+		Migrate: func(tx *gorm.DB) error {
+			// Add webhook URL field
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN webhook_enabled BOOLEAN DEFAULT false").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN webhook_url VARCHAR(255)").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN webhook_secret VARCHAR(255)").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN webhook_headers TEXT").Error; err != nil {
+				return err
+			}
+
+			// Add notification settings
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN notify_on_success BOOLEAN DEFAULT true").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN notify_on_failure BOOLEAN DEFAULT true").Error; err != nil {
+				return err
+			}
+
+			return nil
+		},
+		Rollback: func(tx *gorm.DB) error {
+			// Drop the webhook fields from jobs
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN webhook_enabled").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN webhook_url").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN webhook_secret").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN webhook_headers").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN notify_on_success").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE jobs DROP COLUMN notify_on_failure").Error; err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+}

internal/db/migrations/migrations.go

@@ -15,6 +15,7 @@ func InitMigrations(db *gorm.DB) *gormigrate.Gormigrate {
 		AddMaxConcurrentTransfersColumn(),
 		AddMultiConfigSupport(),
 		UpdateSkipProcessedFilesToNullable(),
+		AddWebhookSupport(),
 	}
 
 	return gormigrate.New(db, gormigrate.DefaultOptions, migrations)