From ca94f0b8951a3520f219dceb68e67fe8e9886c07 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 8 Dec 2022 15:57:30 +0300
Subject: Redirect thread URL to ActivityPub version if Accept header matches

---
 src/main/java/com/juick/www/controllers/Site.java | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'src/main/java/com/juick/www/controllers')

diff --git a/src/main/java/com/juick/www/controllers/Site.java b/src/main/java/com/juick/www/controllers/Site.java
index e28f8e15..2484c8fa 100644
--- a/src/main/java/com/juick/www/controllers/Site.java
+++ b/src/main/java/com/juick/www/controllers/Site.java
@@ -24,6 +24,7 @@ import com.juick.util.HttpForbiddenException;
 import com.juick.util.HttpNotFoundException;
 import com.juick.util.WebUtils;
 import com.juick.www.WebApp;
+import com.juick.www.api.activity.model.Context;
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpSession;
@@ -34,6 +35,7 @@ import com.juick.util.MessageUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.tuple.Pair;
 import org.apache.commons.text.StringEscapeUtils;
+import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
@@ -45,8 +47,8 @@ import org.springframework.web.bind.annotation.CookieValue;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 
 import javax.inject.Inject;
 import java.net.URLEncoder;
@@ -481,9 +483,11 @@ public class Site {
         return "views/pm_sent";
     }
 
-    @GetMapping(value = "/{uname}/{mid}", produces = MediaType.TEXT_HTML_VALUE)
+    @GetMapping(value = "/{uname}/{mid}", produces = { MediaType.TEXT_HTML_VALUE, Context.ACTIVITY_MEDIA_TYPE,
+            Context.LD_JSON_MEDIA_TYPE })
     protected String threadAction(@Visitor User visitor, ModelMap model, @PathVariable String uname,
             @PathVariable int mid,
+            @RequestHeader(name = HttpHeaders.ACCEPT, required = false) String acceptHeader,
             @CookieValue(name = "sape_cookie", required = false, defaultValue = StringUtils.EMPTY) String sapeCookie) {
         if (!messagesService.canViewThread(mid, visitor.getUid())) {
             throw new HttpForbiddenException();
@@ -501,6 +505,16 @@ public class Site {
         if (user.isAnonymous() || !msg.getUser().equals(user)) {
             return String.format("redirect:/%s/%d", msg.getUser().getName(), mid);
         }
+        String linkedDataLocation = "/n/" + mid + "-0";
+        if (StringUtils.isNotBlank(acceptHeader)) {
+            var mediaTypes = MediaType.parseMediaTypes(acceptHeader);
+            var isLinkedDataRequest = (mediaTypes.stream().anyMatch(mediaType -> !mediaType.isWildcardType()
+                    && (mediaType.isCompatibleWith(MediaType.valueOf(Context.ACTIVITY_MEDIA_TYPE))
+                            || mediaType.isCompatibleWith(MediaType.valueOf(Context.LD_JSON_MEDIA_TYPE)))));
+            if (isLinkedDataRequest) {
+                return "redirect:" + linkedDataLocation;
+            }
+        }
         msg.VisitorCanComment = !visitor.isAnonymous();
         msg.getUser().setAvatar(webApp.getAvatarWebPath(msg.getUser()));
         List<Message> replies = messagesService.getReplies(visitor, msg.getMid());
-- 
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