From 66f96f23802d0b19b0643d9affeac893befac00a Mon Sep 17 00:00:00 2001
From: windymelt <windymelt@3qe.us>
Date: Sun, 10 Sep 2023 02:35:26 +0900
Subject: [PATCH] Show meta tag for Open Graph Protocol

---
 .../main/scala/scaladex/core/model/OGP.scala  | 29 +++++++++++++++++++
 .../scala/scaladex/core/model/Project.scala   | 10 +++++++
 .../scaladex/view/project/badges.scala.html   |  2 +-
 .../scaladex/view/project/project.scala.html  |  2 +-
 4 files changed, 41 insertions(+), 2 deletions(-)
 create mode 100644 modules/core/shared/src/main/scala/scaladex/core/model/OGP.scala

diff --git a/modules/core/shared/src/main/scala/scaladex/core/model/OGP.scala b/modules/core/shared/src/main/scala/scaladex/core/model/OGP.scala
new file mode 100644
index 000000000..a2d6f1894
--- /dev/null
+++ b/modules/core/shared/src/main/scala/scaladex/core/model/OGP.scala
@@ -0,0 +1,29 @@
+package scaladex.core.model
+
+/**
+  * Open Graph Protocol, see https://ogp.me/
+  *
+  * @param title
+  * @param url
+  * @param description
+  * @param image
+  * @param imageAlt
+  */
+case class OGP(
+    title: String,
+    url: Url,
+    description: String,
+    image: Option[Url] = None,
+    imageAlt: Option[String] = None
+) {
+  val `type`: String = "article"
+  val siteName: String = "Scaladex"
+  def toHeadMeta: Seq[HeadMeta] = Seq(
+    HeadMeta(name = "og:title", content = title),
+    HeadMeta(name = "og:url", content = url.toString()),
+    HeadMeta(name = "og:description", content = description),
+    HeadMeta(name = "og:site_name", content = siteName)
+  ) ++ image.map(c => HeadMeta(name = "og:image", content = c.target)) ++ imageAlt.map(c =>
+    HeadMeta(name = "og:image:alt", c)
+  )
+}
diff --git a/modules/core/shared/src/main/scala/scaladex/core/model/Project.scala b/modules/core/shared/src/main/scala/scaladex/core/model/Project.scala
index 1c79a0e9c..d929a678c 100644
--- a/modules/core/shared/src/main/scala/scaladex/core/model/Project.scala
+++ b/modules/core/shared/src/main/scala/scaladex/core/model/Project.scala
@@ -28,6 +28,16 @@ case class Project(
     githubInfo.flatMap(_.logo)
   )
 
+  /**
+    * This is used in embedding to another website to render the card of a scaladex project link.
+    */
+  def ogp: OGP = OGP(
+    title = s"Scaladex - ${organization.toString()} / ${repository.toString()}",
+    url = Url(s"https://index.scala-lang.org/${organization.toString()}/${repository.toString()}"),
+    description = githubInfo.flatMap(_.description).getOrElse(""),
+    image = githubInfo.flatMap(_.logo).orElse(Some(Url("https://index.scala-lang.org/assets/img/scaladex-brand.svg"))),
+  )
+
   def scaladoc(artifact: Artifact): Option[DocumentationLink] =
     settings.customScalaDoc
       .map(DocumentationPattern("Scaladoc", _).eval(artifact))
diff --git a/modules/template/src/main/twirl/scaladex/view/project/badges.scala.html b/modules/template/src/main/twirl/scaladex/view/project/badges.scala.html
index eb2607d97..991316984 100644
--- a/modules/template/src/main/twirl/scaladex/view/project/badges.scala.html
+++ b/modules/template/src/main/twirl/scaladex/view/project/badges.scala.html
@@ -15,7 +15,7 @@
   header: ProjectHeader,
   artifact: Artifact
 )
-@main(env, title = project.repository.value, user, extraMeta = project.twitterCard.toHeadMeta) {
+@main(env, title = project.repository.value, user, extraMeta = project.twitterCard.toHeadMeta ++ project.ogp.toHeadMeta) {
   <main id="container-project">
     @headproject(env, user, project, header, "Badges")
     <div class="container">
diff --git a/modules/template/src/main/twirl/scaladex/view/project/project.scala.html b/modules/template/src/main/twirl/scaladex/view/project/project.scala.html
index 0770ac6b1..9b67ca091 100644
--- a/modules/template/src/main/twirl/scaladex/view/project/project.scala.html
+++ b/modules/template/src/main/twirl/scaladex/view/project/project.scala.html
@@ -17,7 +17,7 @@
   directDependencies: Map[Project.Reference, (ArtifactDependency.Scope, Seq[SemanticVersion])],
   reverseDependency: Map[Project.Reference, (ArtifactDependency.Scope, SemanticVersion)],
 )
-@main(env, title = project.repository.value, user, extraMeta = project.twitterCard.toHeadMeta) {
+@main(env, title = project.repository.value, user, extraMeta = project.twitterCard.toHeadMeta ++ project.ogp.toHeadMeta) {
   <main id="container-project">
     @headproject(env, user, project, header, "Project")
     <div class="container">