feat: SEO backend data (1/4)

internal/infrastructure/useCases/CreateArticle.go

@@ -66,12 +66,13 @@ func (g *CreateArticleUseCase) CreateArticle(ctx context.Context, createArticle
 		return article.Article{}, err
 	}
 
-	created, err := g.articleRepository.Create(article.Article{
-		Title:    createArticle.Title,
-		Body:     createArticle.Body,
-		IsOnline: false,
-		SiteID:   siteID,
-		Authors:  creditedAuthors,
+	created, err := g.createWithFreeSlug(article.Article{
+		Title:        createArticle.Title,
+		Body:         createArticle.Body,
+		IsOnline:     false,
+		SiteID:       siteID,
+		Authors:      creditedAuthors,
+		SEODismissed: []string{},
 	})
 	if err != nil {
 		recordFailure(ctx, g.recorder, event, err)
@@ -83,6 +84,22 @@ func (g *CreateArticleUseCase) CreateArticle(ctx context.Context, createArticle
 	return renderArticle(g.bodyRenderer, created, createArticle.Format)
 }
 
+func (g *CreateArticleUseCase) createWithFreeSlug(draft article.Article) (article.Article, error) {
+	base := article.GenerateSlug(draft.Title)
+	for attempt := 0; attempt < maxCreateSlugAttempts; attempt++ {
+		slug, err := freeSlug(g.articleRepository, draft.SiteID, base, 0, firstSlugAttempt)
+		if err != nil {
+			return article.Article{}, err
+		}
+		draft.Slug = slug
+		created, err := g.articleRepository.Create(draft)
+		if !isSlugTakenError(err) {
+			return created, err
+		}
+	}
+	return article.Article{}, article.ErrSlugTaken
+}
+
 func articleTarget(a article.Article) audit.Target {
 	return audit.NewTarget(audit.TargetArticle, a.ID, a.Title)
 }