refactoring reading Meta and RenderedContent

cmd/owl-web/handler.go

@@ -95,7 +95,7 @@ func postHandler(repo *owl.Repository) func(http.ResponseWriter, *http.Request,
 			return
 		}
 
-		_, meta := post.MarkdownData()
+		meta := post.Meta()
 		if meta.Draft {
 			println("Post is a draft")
 			notFoundHandler(repo)(w, r)

post.go

@@ -16,6 +16,8 @@ type Post struct {
 	user       *User
 	id         string
 	title      string
+	metaLoaded bool
+	meta       PostMeta
 }
 
 type PostMeta struct {
@@ -57,17 +59,24 @@ func (post Post) ContentFile() string {
 	return path.Join(post.Dir(), "index.md")
 }
 
+func (post *Post) Meta() PostMeta {
+	if !post.metaLoaded {
+		post.LoadMeta()
+	}
+	return post.meta
+}
+
 func (post Post) Content() []byte {
 	// read file
 	data, _ := ioutil.ReadFile(post.ContentFile())
 	return data
 }
 
-func (post Post) MarkdownData() (bytes.Buffer, PostMeta) {
+func (post Post) RenderedContent() bytes.Buffer {
 	data := post.Content()
 
-	// get yaml metadata block
-	meta := PostMeta{}
+	// trim yaml block
+	// TODO this can be done nicer
 	trimmedData := bytes.TrimSpace(data)
 	// check first line is ---
 	if string(trimmedData[0:4]) == "---\n" {
@@ -75,8 +84,6 @@ func (post Post) MarkdownData() (bytes.Buffer, PostMeta) {
 		// find --- end
 		end := bytes.Index(trimmedData, []byte("\n---\n"))
 		if end != -1 {
-			metaData := trimmedData[:end]
-			yaml.Unmarshal(metaData, &meta)
 			data = trimmedData[end+5:]
 		}
 	}
@@ -100,13 +107,35 @@ func (post Post) MarkdownData() (bytes.Buffer, PostMeta) {
 	if err := markdown.Convert(data, &buf, parser.WithContext(context)); err != nil {
 		panic(err)
 	}
-	// metaData := meta.Get(context)
 
-	return buf, meta
+	return buf
 
 }
 
 func (post Post) Aliases() []string {
-	_, metaData := post.MarkdownData()
-	return metaData.Aliases
+	return post.Meta().Aliases
+}
+
+func (post *Post) LoadMeta() error {
+	data := post.Content()
+
+	// get yaml metadata block
+	meta := PostMeta{}
+	trimmedData := bytes.TrimSpace(data)
+	// check first line is ---
+	if string(trimmedData[0:4]) == "---\n" {
+		trimmedData = trimmedData[4:]
+		// find --- end
+		end := bytes.Index(trimmedData, []byte("\n---\n"))
+		if end != -1 {
+			metaData := trimmedData[:end]
+			err := yaml.Unmarshal(metaData, &meta)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	post.meta = meta
+	return nil
 }

post_test.go

@@ -79,7 +79,7 @@ func TestDraftInMetaData(t *testing.T) {
 	content += "\n"
 	content += "Write your post here.\n"
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
-	_, meta := post.MarkdownData()
+	meta := post.Meta()
 	if !meta.Draft {
 		t.Error("Draft should be true")
 	}
@@ -97,7 +97,7 @@ func TestNoRawHTMLIfDisallowedByRepo(t *testing.T) {
 	content += "\n"
 	content += "<script>alert('foo')</script>\n"
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
-	html, _ := post.MarkdownData()
+	html := post.RenderedContent()
 	html_str := html.String()
 	if strings.Contains(html_str, "<script>") {
 		t.Error("HTML should not be allowed")
@@ -116,9 +116,50 @@ func TestRawHTMLIfAllowedByRepo(t *testing.T) {
 	content += "\n"
 	content += "<script>alert('foo')</script>\n"
 	os.WriteFile(post.ContentFile(), []byte(content), 0644)
-	html, _ := post.MarkdownData()
+	html := post.RenderedContent()
 	html_str := html.String()
 	if !strings.Contains(html_str, "<script>") {
 		t.Error("HTML should be allowed")
 	}
 }
+
+func TestLoadMeta(t *testing.T) {
+	repo := getTestRepo()
+	repo.SetAllowRawHtml(true)
+	user, _ := repo.CreateUser("testuser")
+	post, _ := user.CreateNewPost("testpost")
+
+	content := "---\n"
+	content += "title: test\n"
+	content += "draft: true\n"
+	content += "date: Wed, 17 Aug 2022 10:50:02 +0000\n"
+	content += "aliases:\n"
+	content += "  - foo/bar/\n"
+	content += "---\n"
+	content += "\n"
+	content += "<script>alert('foo')</script>\n"
+	os.WriteFile(post.ContentFile(), []byte(content), 0644)
+
+	err := post.LoadMeta()
+
+	if err != nil {
+		t.Errorf("Got Error: %v", err)
+	}
+
+	if post.Meta().Title != "test" {
+		t.Errorf("Expected title: %s, got %s", "test", post.Meta().Title)
+	}
+
+	if len(post.Meta().Aliases) != 1 || post.Meta().Aliases[0] != "foo/bar/" {
+		t.Errorf("Expected title: %v, got %v", []string{"foo/bar/"}, post.Meta().Aliases)
+	}
+
+	if post.Meta().Date != "Wed, 17 Aug 2022 10:50:02 +0000" {
+		t.Errorf("Expected title: %s, got %s", "Wed, 17 Aug 2022 10:50:02 +0000", post.Meta().Title)
+	}
+
+	if post.Meta().Draft != true {
+		t.Errorf("Expected title: %v, got %v", true, post.Meta().Draft)
+	}
+
+}

renderer.go

@@ -68,7 +68,7 @@ func renderIntoBaseTemplate(user User, data PageContent) (string, error) {
 }
 
 func RenderPost(post Post) (string, error) {
-	buf, _ := post.MarkdownData()
+	buf := post.RenderedContent()
 	postHtml, err := renderEmbedTemplate("embed/post.html", PostRenderData{
 		Title: post.Title(),
 		Post:  template.HTML(buf.String()),

rss.go

@@ -41,7 +41,7 @@ func RenderRSSFeed(user User) (string, error) {
 
 	posts, _ := user.Posts()
 	for _, post := range posts {
-		_, meta := post.MarkdownData()
+		meta := post.Meta()
 		rss.Channel.Items = append(rss.Channel.Items, RSSItem{
 			Guid:    post.FullUrl(),
 			Title:   post.Title(),

user.go

@@ -68,7 +68,7 @@ func (user User) Posts() ([]*Post, error) {
 	// remove drafts
 	n := 0
 	for _, post := range posts {
-		_, meta := post.MarkdownData()
+		meta := post.Meta()
 		if !meta.Draft {
 			posts[n] = post
 			n++
@@ -83,7 +83,7 @@ func (user User) Posts() ([]*Post, error) {
 
 	postDates := make([]PostWithDate, len(posts))
 	for i, post := range posts {
-		_, meta := post.MarkdownData()
+		meta := post.Meta()
 		date, err := time.Parse(time.RFC1123Z, meta.Date)
 		if err != nil {
 			// invalid date -> use 1970-01-01
@@ -111,8 +111,9 @@ func (user User) GetPost(id string) (Post, error) {
 	}
 
 	post := Post{user: &user, id: id}
-	_, metaData := post.MarkdownData()
-	title := metaData.Title
+	// post.loadMeta()
+	meta := post.Meta()
+	title := meta.Title
 	post.title = fmt.Sprint(title)
 
 	return post, nil

user_test.go

@@ -41,7 +41,7 @@ func TestCreateNewPostAddsDateToMetaBlock(t *testing.T) {
 	user.CreateNewPost("testpost")
 	posts, _ := user.Posts()
 	post, _ := user.GetPost(posts[0].Id())
-	_, meta := post.MarkdownData()
+	meta := post.Meta()
 	if meta.Date == "" {
 		t.Error("Found no date. Got: " + meta.Date)
 	}