feat: add linked data

3 files changed, 32 insertions, 0 deletions

diff --git a/internal/router/basic-handler.go b/internal/router/basic-handler.go
index 96d0f77..b973d01 100644
--- a/internal/router/basic-handler.go
+++ b/internal/router/basic-handler.go
@@ -53,6 +53,10 @@ func (r *BasicHandler) AddMeta(c *fiber.Ctx, supplements *Supplements, lang stri
 	return []MetaField{{Name: "robots", Content: "noindex,nofollow"}}, nil
 }
 
+func (r *BasicHandler) AddLinkedData(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (ld map[string]any, err error) {
+	return nil, nil
+}
+
 func (r *BasicHandler) RenderHeader(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (statusCode int, err error) {
 	return fiber.StatusNoContent, nil
 }
diff --git a/internal/router/handlers/lang-blog-title.go b/internal/router/handlers/lang-blog-title.go
index a9acdbb..5bfc6e7 100644
--- a/internal/router/handlers/lang-blog-title.go
+++ b/internal/router/handlers/lang-blog-title.go
@@ -81,6 +81,22 @@ func (r *BlogPageHandler) AddMeta(c *fiber.Ctx, supplements *router.Supplements,
 	}, nil
 }
 
+func (r *BlogPageHandler) AddLinkedData(c *fiber.Ctx, supplements *router.Supplements, lang string, templateMap fiber.Map) (ld map[string]any, err error) {
+	metadata, _, err := supplements.B2Client.ReadFrontmatter(lang + "/" + c.Params("title") + ".md")
+	if err != nil {
+		return nil, fmt.Errorf("failed to read frontmatter of the desired blog post: %w", err)
+	}
+
+	return map[string]any{
+		"@context":      "https://schema.org",
+		"@type":         "Article",
+		"headline":      metadata.Title,
+		"description":   fmt.Sprintf("%s [%s]", metadata.ShortDescription, metadata.ActionDate),
+		"author":        map[string]string{"@type": "Person", "name": "Saya Andy"},
+		"datePublished": metadata.PublishedTime.UTC().Format(time.RFC3339),
+	}, nil
+}
+
 func (r *BlogPageHandler) RenderBody(c *fiber.Ctx, supplements *router.Supplements, lang string, templateMap fiber.Map) (statusCode int, err error) {
 	_, pathParts, _, err := router.GetPathFromReferer(c)
 	if err != nil {
diff --git a/internal/router/router.go b/internal/router/router.go
index 3ce7e3b..0d0ce8c 100644
--- a/internal/router/router.go
+++ b/internal/router/router.go
@@ -2,8 +2,10 @@ package router
 
 import (
 	"database/sql"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"html/template"
 	"log/slog"
 	"net/url"
 	"slices"
@@ -78,6 +80,7 @@ type Route interface {
 	ContentType() string
 	Render(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (statusCode int, err error)
 	AddMeta(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (meta []MetaField, err error)
+	AddLinkedData(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (ld map[string]any, err error)
 	RenderHeader(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (statusCode int, err error)
 	RenderBody(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (statusCode int, err error)
 	RenderFooter(c *fiber.Ctx, supplements *Supplements, lang string, templateMap fiber.Map) (statusCode int, err error)
@@ -428,6 +431,15 @@ func (r *Router) generalPage(c *fiber.Ctx, route Route, lang string) error {
 		slog.Warn("failed to receive meta", slog.String("path", path), slog.String("error", err.Error()))
 	}
 
+	var ld map[string]any
+	if ld, err = route.AddLinkedData(c, r.supplements, lang, valueMap); err != nil {
+		slog.Warn("failed to receive linked data", slog.String("path", path), slog.String("error", err.Error()))
+	}
+	if ld != nil {
+		ldBytes, _ := json.Marshal(ld)
+		valueMap["LinkedData"] = template.JS(ldBytes)
+	}
+
 	content, err := r.supplements.TemplateManager.Render("general-page", valueMap)
 	if err != nil {
 		slog.Warn("failed to generate div", slog.String("path", path), slog.String("error", err.Error()))