print game to PDF, stream it as chunked HTTP and cache it in CDN

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "public/staunton"]
 	path = public/staunton
 	url = https://github.com/clarkerubber/Staunton-Pieces
+[submodule "submodules/pdfexporter"]
+	path = submodules/pdfexporter
+	url = https://github.com/clarkerubber/lichessPDFExporter

app/controllers/Analyse.scala

@@ -6,6 +6,7 @@ import akka.pattern.ask
 import play.api.http.ContentTypes
 import play.api.mvc._
 import play.twirl.api.Html
+import play.api.libs.iteratee.{ Iteratee, Enumerator }
 
 import lila.analyse.{ Analysis, TimeChart, AdvantageChart }
 import lila.api.Context
@@ -92,6 +93,13 @@ object Analyse extends LilaController {
     }
   }
 
+  def pdf(id: String) = Open { implicit ctx =>
+    OptionResult(GameRepo game id) { game =>
+      Ok.chunked(Enumerator.outputStream(Env.game.pdfExport(game.id))).withHeaders(
+        CONTENT_TYPE -> ContentTypes.withCharset("application/pdf"))
+    }
+  }
+
   private def gameOpening(game: GameModel) =
     if (game.fromPosition || game.variant.exotic) none
     else chess.OpeningExplorer openingOf game.pgnMoves

conf/routes

@@ -138,6 +138,8 @@ POST  /$gameId<\w{8}>/better-analysis/$color<white|black> controllers.Analyse.be
 POST  /$gameId<\w{8}>/post-analysis       controllers.Analyse.postAnalysis(gameId: String)
 GET   /$gameId<\w{8}>/pgn                 controllers.Analyse.pgn(gameId: String)
 
+GET   /game/pdf/$gameId<\w{8}>                 controllers.Analyse.pdf(gameId: String)
+
 # Pref
 POST  /pref/:name                      controllers.Pref.set(name: String)
 GET   /account/preferences             controllers.Pref.form

modules/game/src/main/Env.scala

@@ -28,6 +28,7 @@ final class Env(
     val ActorName = config getString "actor.name"
     val UciMemoTtl = config duration "uci_memo.ttl"
     val netBaseUrl = config getString "net.base_url"
+    val PdfExecPath = config getString "pdf.exec_path"
   }
   import settings._
 
@@ -35,6 +36,8 @@ final class Env(
 
   private[game] lazy val gameColl = db(CollectionGame)
 
+  lazy val pdfExport = PdfExport(PdfExecPath) _
+
   lazy val cached = new Cached(ttl = CachedNbTtl)
 
   lazy val paginator = new PaginatorBuilder(

modules/game/src/main/PdfExport.scala

@@ -0,0 +1,14 @@
+package lila.game
+
+import java.io.{ File, OutputStream }
+import scala.sys.process._
+
+object PdfExport {
+  
+  private val logger = ProcessLogger(_ => (), _ => ())
+
+  def apply(execPath: String)(id: String)(out: OutputStream) {
+    val exec = Process(Seq("php", "main.php", id), new File(execPath))
+    exec #> out ! logger
+  }
+}

modules/i18n/src/main/Env.scala

@@ -22,6 +22,7 @@ final class Env(
     val CollectionTranslation = config getString "collection.translation"
     val ContextGitUrl = config getString "context.git.url"
     val ContextGitFile = config getString "context.git.file"
+    val CdnDomain = config getString "cdn_domain"
   }
   import settings._
 
@@ -40,7 +41,10 @@ final class Env(
 
   lazy val keys = new I18nKeys(translator)
 
-  lazy val requestHandler = new I18nRequestHandler(pool, RequestHandlerProtocol)
+  lazy val requestHandler = new I18nRequestHandler(
+    pool,
+    RequestHandlerProtocol,
+    CdnDomain)
 
   lazy val jsDump = new JsDump(
     path = appPath + "/" + WebPathRelative,

modules/i18n/src/main/I18nRequestHandler.scala

@@ -6,12 +6,18 @@ import play.api.mvc.{ Action, RequestHeader, Handler }
 
 import lila.common.HTTPRequest
 
-final class I18nRequestHandler(pool: I18nPool, protocol: String) {
+final class I18nRequestHandler(
+    pool: I18nPool,
+    protocol: String,
+    cdnDomain: String) {
 
   def apply(req: RequestHeader): Option[Handler] =
-    (HTTPRequest.isRedirectable(req) && !pool.domainLang(req).isDefined) option Action {
-      Redirect(redirectUrl(req))
-    }
+    (HTTPRequest.isRedirectable(req) &&
+      !pool.domainLang(req).isDefined &&
+      req.host != cdnDomain
+    ) option Action {
+        Redirect(redirectUrl(req))
+      }
 
   private def redirectUrl(req: RequestHeader) =
     protocol +

submodules/pdfexporter

@@ -0,0 +1 @@
+Subproject commit 8d6c9550432ce462e4e977a770751354da097cf4