feat: add per-user tenant scoping

internal/store/tenancy.go

@@ -0,0 +1,34 @@
+package store
+
+import (
+	"context"
+	"fmt"
+
+	"git.warky.dev/wdevs/amcs/internal/tenancy"
+)
+
+func tenantKeyPtr(ctx context.Context) *string {
+	if key, ok := tenancy.KeyFromContext(ctx); ok {
+		return &key
+	}
+	return nil
+}
+
+func tenantKey(ctx context.Context) (string, bool) {
+	return tenancy.KeyFromContext(ctx)
+}
+
+func addTenantCondition(ctx context.Context, args *[]any, conditions *[]string, column string) {
+	if key, ok := tenancy.KeyFromContext(ctx); ok {
+		*args = append(*args, key)
+		*conditions = append(*conditions, fmt.Sprintf("%s = $%d", column, len(*args)))
+	}
+}
+
+func tenantSQL(ctx context.Context, args *[]any, column string) string {
+	if key, ok := tenancy.KeyFromContext(ctx); ok {
+		*args = append(*args, key)
+		return fmt.Sprintf(" and %s = $%d", column, len(*args))
+	}
+	return ""
+}