feat: add opengraph and twitter previews

Signed-off-by: Sphericalkat <amolele@gmail.com>

api/routes/show.go

@@ -1,6 +1,7 @@
 package routes
 
 import (
+	"fmt"
 	"html/template"
 	"time"
 
@@ -23,7 +24,22 @@ func show(c *fiber.Ctx) error {
 	post := e.Data.Post
 	publishDate := time.UnixMilli(e.Data.Post.CreatedAt)
 
-	p := converters.ConvertParagraphs(post.Content.BodyModel.Paragraphs)
+	paragraphs := post.Content.BodyModel.Paragraphs
+
+	p := converters.ConvertParagraphs(paragraphs)
+
+	desc := ""
+	if len(paragraphs) >= 0 {
+		desc = paragraphs[1].Text
+	}
+
+	imgUrl := ""
+	for _, p := range paragraphs {
+		if p.Type == "IMG" {
+			imgUrl = fmt.Sprintf("https://miro.medium.com/v2/resize:fit:1200/%s", p.Metadata.ID)
+			break
+		}
+	}
 
 	return c.Render("show", fiber.Map {
 		"Title": post.Title,
@@ -31,6 +47,9 @@ func show(c *fiber.Ctx) error {
 		"Author": post.Creator.Name,
 		"PublishDate": publishDate.Format(time.DateOnly),
 		"Paragraphs": template.HTML(p),
+		"Description": desc,
+		"Path": c.Path(),
+		"Image": imgUrl,
 	})
 }