feat: add knowledgeHub domain

backend/internal/domain/knowledgeHub.go

@@ -0,0 +1,58 @@
+package domain
+
+import (
+	"context"
+	"time"
+
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+type KnowledgeArticle struct {
+	UUID        string
+	Title       string
+	Content     string
+	Author      string
+	PublishDate time.Time
+	ReadTime    string
+	Categories  []string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+func (k *KnowledgeArticle) Validate() error {
+	return validation.ValidateStruct(k,
+		validation.Field(&k.Title, validation.Required),
+		validation.Field(&k.Content, validation.Required),
+		validation.Field(&k.Author, validation.Required),
+		validation.Field(&k.PublishDate, validation.Required),
+	)
+}
+
+type TableOfContent struct {
+	UUID      string
+	ArticleID string
+	Title     string
+	Order     int
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type RelatedArticle struct {
+	UUID         string
+	ArticleID    string
+	RelatedTitle string
+	RelatedTag   string
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
+}
+
+type KnowledgeHubRepository interface {
+	GetArticleByID(context.Context, string) (KnowledgeArticle, error)
+	GetArticlesByCategory(ctx context.Context, category string) ([]KnowledgeArticle, error)
+	GetAllArticles(ctx context.Context) ([]KnowledgeArticle, error)
+	CreateOrUpdateArticle(context.Context, *KnowledgeArticle) error
+	DeleteArticle(context.Context, string) error
+
+	GetTableOfContents(ctx context.Context, articleID string) ([]TableOfContent, error)
+	GetRelatedArticles(ctx context.Context, articleID string) ([]RelatedArticle, error)
+}