fix: shared renamed to pkg, formatting changes

pkg/plugin/implementation/publisher/cmd/plugin.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/beckn/beckn-onix/pkg/plugin/definition"
+	"github.com/beckn/beckn-onix/pkg/plugin/implementation/publisher"
+)
+
+// Returns error if required fields are missing.
+func validateConfig(config map[string]string) (*publisher.Config, error) {
+	if config == nil {
+		return nil, fmt.Errorf("config cannot be nil")
+	}
+
+	project, ok := config["project"]
+	if !ok || project == "" {
+		return nil, fmt.Errorf("project ID is required")
+	}
+
+	topic, ok := config["topic"]
+	if !ok || topic == "" {
+		return nil, fmt.Errorf("topic ID is required")
+	}
+
+	return &publisher.Config{
+		ProjectID: project,
+		TopicID:   topic,
+	}, nil
+}
+
+// PublisherProvider implements the definition.PublisherProvider interface.
+type PublisherProvider struct{}
+
+// New creates a new Publisher instance.
+func (p PublisherProvider) New(ctx context.Context, config map[string]string) (definition.Publisher, error) {
+	if ctx == nil {
+		return nil, fmt.Errorf("context cannot be nil")
+	}
+
+	cfg, err := validateConfig(config)
+	if err != nil {
+		return nil, fmt.Errorf("invalid config: %w", err)
+	}
+
+	return publisher.New(ctx, cfg)
+}
+
+// Provider is the exported symbol that the plugin manager will look for.
+var Provider definition.PublisherProvider = PublisherProvider{}