From fddcedccc2c1204db0e6c783a9d99bf509c39244 Mon Sep 17 00:00:00 2001
From: Bnyro <bnyro@tutanota.com>
Date: Wed, 18 Oct 2023 18:27:58 +0200
Subject: [PATCH] [feat] hostname replace on client side

---
 .../simple/src/js/main/hostname_replace.js    | 78 +++++++++++++++++++
 .../themes/simple/src/js/main/results.js      |  1 -
 2 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 searx/static/themes/simple/src/js/main/hostname_replace.js

diff --git a/searx/static/themes/simple/src/js/main/hostname_replace.js b/searx/static/themes/simple/src/js/main/hostname_replace.js
new file mode 100644
index 000000000..1b84ac430
--- /dev/null
+++ b/searx/static/themes/simple/src/js/main/hostname_replace.js
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+(function (w, d, searxng) {
+  'use strict';
+
+  if (searxng.endpoint !== 'results') {
+    return;
+  }
+
+  searxng.ready(function () {
+    const formatUrl = (urlStr) => {
+      const url = new URL(urlStr);
+      return url.origin + url.pathname.split("/").join(" › ");
+    }
+
+    // client side hostname replace
+    if (window.localStorage?.getItem("rewrites")) {
+      const rewrites = window.localStorage.getItem("rewrites").split("\n");
+
+      const applyAllRewrites = (url) => {
+        for (let rewrite of rewrites) {
+
+          // filter out blank lines
+          if (!rewrite) continue;
+
+          // we're dealing with user input here, hence all the regex logic
+          // is done inside a try catch clause to avoid crashes due to wrong
+          // usage by the end user
+          try {
+            const [pattern, replacement] = rewrite.split(":");
+            const regExp = new RegExp(pattern);
+            // if no replacement specified and the pattern found, all
+            if (url.origin.match(regExp).length) {
+              if (!replacement) return true;
+
+              // replace the hostname of the url and skip any further patterns
+              url.hostname = replacement;
+              break;
+            }
+          } catch (exception) {
+            // ignore malformed patterns and skip to the next one
+            continue;
+          }
+        }
+
+        return false;
+      }
+
+      // iterate over all visible results and replace the url if needed
+      for (let element of document.querySelectorAll("article.result")) {
+        const anchorElements = element.querySelectorAll("a");
+
+        // iterate over all anchor elements with a 'href' and replace the
+        // href if the pattern was found or completely remove it if no
+        // replacement was provided by the user
+        for (let anchorElement of anchorElements) {
+          if (!anchorElement.href.trim()) continue;
+
+          let newUrl = new URL(anchorElement.href);
+          const shouldHide = applyAllRewrites(newUrl);
+          if (shouldHide) {
+            element.style.display = 'none';
+            break;
+          }
+          anchorElement.href = newUrl.toString();
+        }
+
+        // update the url in the url preview wrapper
+        const urlPreview = element.querySelector(".url_wrapper");
+        if (urlPreview) {
+          let url = new URL(urlPreview.href);
+          applyAllRewrites(url);
+          urlPreview.href = url;
+          urlPreview.innerText = formatUrl(url);
+        }
+      }
+    }
+  });
+})(window, document, window.searxng);
diff --git a/searx/static/themes/simple/src/js/main/results.js b/searx/static/themes/simple/src/js/main/results.js
index 7342f94b2..bccc104ea 100644
--- a/searx/static/themes/simple/src/js/main/results.js
+++ b/searx/static/themes/simple/src/js/main/results.js
@@ -113,7 +113,6 @@
         }
       }
     }, true);
-
   });
 
 })(window, document, window.searxng);