From 3ea1ce06c94aca425b05cb4c5d4dbac2cf5410b3 Mon Sep 17 00:00:00 2001
From: Derrick Hammer <derrick@derrickhammer.com>
Date: Wed, 18 Oct 2023 08:58:33 -0400
Subject: [PATCH] fix: add srcset support

---
 src/backend/filters/urlRewrite.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/backend/filters/urlRewrite.ts b/src/backend/filters/urlRewrite.ts
index 130f27a..5cb34ec 100644
--- a/src/backend/filters/urlRewrite.ts
+++ b/src/backend/filters/urlRewrite.ts
@@ -43,6 +43,20 @@ export default class URLRewriteFilter implements ContentFilter {
               $(element).attr(attrName, urlValue);
             }
           }
+
+          if (tag === "img" && $(element).attr("srcset")) {
+            let srcsetValue = $(element).attr("srcset");
+            let srcsetValues = srcsetValue?.split(",");
+            let rewrittenSrcsetValues = srcsetValues?.map((srcsetEntry) => {
+              let [url, descriptor] = srcsetEntry.trim().split(" ");
+              if (!url.startsWith("http") && !url.startsWith("//")) {
+                url = path.join(rUrl.pathname, url);
+                url = `${rUrl.protocol}//${rUrl.hostname}/browse/${rUrl.hostname}${url}`;
+              }
+              return `${url} ${descriptor}`;
+            });
+            $(element).attr("srcset", rewrittenSrcsetValues?.join(", "));
+          }
         });
     });