From ba2e6f63766fd0d7df2703914ffd80a3a64fe8f0 Mon Sep 17 00:00:00 2001
From: leafee98 <leafee98@hotmail.com>
Date: Fri, 14 Jul 2023 15:56:29 +0800
Subject: [PATCH] support hide permalink

---
 config.toml             | 18 ++++++-------
 index.js                | 59 ++++++++++++++++++++++++++++++++++-------
 template/index.html.njk | 51 ++++++++++++++++++++++++++++++++---
 3 files changed, 105 insertions(+), 23 deletions(-)

diff --git a/config.toml b/config.toml
index e961811..db37b66 100644
--- a/config.toml
+++ b/config.toml
@@ -8,19 +8,19 @@ canonical_link = "https://leafee98.com/"
 name = "Social"
 
 [[section.items]]
-name        = "GitHub"
-permalink   = "https://github.com/leafee98"
-highlight   = true
+name           = "GitHub"
+permalink      = "https://github.com/leafee98"
+highlight      = true
 
 [[section.items]]
-name        = "Email"
-permalink   = "mailto:mail@example.org"
-hide        = true
+name           = "Email"
+permalink      = "mailto:mail@example.org"
+hide_permalink = true
 
 [[section.items]]
-name        = "Matrix"
-permalink   = "https://matrix.to/#/@matrix:example.org"
-hide        = true
+name           = "Matrix"
+permalink      = "https://matrix.to/#/@matrix:example.org"
+hide_permalink = true
 
 [[section]]
 name = "Sites"
diff --git a/index.js b/index.js
index 48a8b04..f6e85f5 100644
--- a/index.js
+++ b/index.js
@@ -8,7 +8,7 @@ import express from "express";
 
 const url_path      = "/";
 const config_path   = "config.toml";
-const template_dir  = "template";
+const template_dir  = "template/";
 const template_path = "index.html.njk";
 const output_path   = "dist/index.html";
 
@@ -25,10 +25,21 @@ function main() {
     program.help();
   }
 
-  var config = fs.readFileSync(config_path, {encoding: "utf-8"});
+  let config = fs.readFileSync(config_path, {encoding: "utf-8"});
   config = toml.parse(config)
 
-  nunjucks.configure(template_dir, {
+  for (let i = 0; i < config["section"].length; i++) {
+    for (let j = 0; j < config["section"][i]["items"].length; j++) {
+      let item = config["section"][i]["items"][j];
+      if (item.hide_permalink) {
+        let seed = Math.floor(Math.random() * 1000000007)
+        item.permalink = hide(seed, item.permalink);
+        item.seed = seed;
+      }
+    }
+  }
+
+  let nunjucks_env = nunjucks.configure(template_dir, {
     autoescape: true,
     throwOnUndefined: true,
     trimBlocks: true,
@@ -36,18 +47,17 @@ function main() {
   });
 
   if (options.serve) {
-    serve(config);
+    serve(config, nunjucks_env);
   }
 
   if (options.generate) {
-    generate(config);
+    generate(config, nunjucks_env);
   }
 };
 
-
-function serve(config) {
+function serve(config, nunjucks_env) {
   config.dev = true;
-  const rendered = nunjucks.render(template_path, config);
+  const rendered = nunjucks_env.render(template_path, config);
 
   const app = express();
   const port = 3000;
@@ -67,12 +77,41 @@ function serve(config) {
   });
 }
 
-function generate(config) {
-  const rendered = nunjucks.render(template_path, config);
+function generate(config, nunjucks_env) {
+  const rendered = nunjucks_env.render(template_path, config);
   if (! fs.existsSync(path.dirname(output_path))) {
     fs.mkdirSync(fs.dirname(output_path), { recursive: true });
   }
   fs.writeFileSync(output_path, rendered);
 }
 
+// A simple function to encrypt string
+// to avoid being collected by robots.
+function hide(seed, str) {
+  const str_arr = new TextEncoder().encode(str);
+  const res_arr = [];
+  seed %= 1000000007;
+
+  for (let i = 0; i < str_arr.length; i++) {
+    res_arr.push((str_arr[i] + seed) % 256);
+    seed = seed * seed % 1000000007;
+  }
+
+
+  return res_arr;
+}
+
+function unhide(seed, arr) {
+  seed %= 1000000007;
+  const str_arr = [];
+  for (let i = 0; i < arr.length; i++) {
+    str_arr.push((((arr[i] - seed) % 256) + 256) % 256)
+    seed = seed * seed % 1000000007;
+  }
+
+  const ui8_arr = new Uint8Array(str_arr);
+  const str = new TextDecoder().decode(ui8_arr);
+  return str;
+}
+
 main();
diff --git a/template/index.html.njk b/template/index.html.njk
index cc9c412..43da18a 100644
--- a/template/index.html.njk
+++ b/template/index.html.njk
@@ -23,6 +23,41 @@
 </script>
 {% endmacro %}
 
+{% macro unhide_func() %}
+<script>
+  function unhide(seed, arr) {
+    seed %= 1000000007;
+    const str_arr = [];
+    for (let i = 0; i < arr.length; i++) {
+      str_arr.push((((arr[i] - seed) % 256) + 256) % 256)
+      seed = seed * seed % 1000000007;
+    }
+
+    const ui8_arr = new Uint8Array(str_arr);
+    const str = new TextDecoder().decode(ui8_arr);
+    console.log(str);
+    return str;
+  }
+
+  function unhide_permalink() {
+    let anchors = document.querySelectorAll("a[hidden_permalink][seed]")
+    for (let anchor of anchors) {
+      let arr = new Array();
+      for (let n of anchor.getAttribute("hidden_permalink").split(",")) {
+        arr.push(Number(n));
+      };
+
+      let seed = Number(anchor.getAttribute("seed"))
+
+      console.log(arr);
+      console.log(seed);
+
+      anchor.href = unhide(seed, arr);
+    }
+  }
+</script>
+{% endmacro %}
+
 
 {% macro render_item(item) %}
 
@@ -31,12 +66,18 @@
 {% set class_str = class_str + " " + "highlight" %}
 {% endif %}
 
-{% set href ="/#" %}
-{% if item.permalink is defined %}
+{% set href = "/#" %}
+{% if item.permalink is defined and not item.hide_permalink %}
 {% set href = item.permalink %}
 {% endif %}
 
-<a class="{{ class_str }}" href="{{ href | safe }}">
+{% set misc_attr = "" %}
+{% if item.hide_permalink %}
+{% set misc_attr = misc_attr + " " + "hidden_permalink=\"" + item.permalink + "\"" %}
+{% set misc_attr = misc_attr + " " + "seed=\"" + item.seed + "\"" %}
+{% endif %}
+
+<a class="{{ class_str }}" href="{{ href | safe }}" {{ misc_attr | safe }}>
   <dl>
     <dt>{{ item.name }}</dt>
     {% if item.description is defined %}
@@ -69,12 +110,14 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width,minimum-scale=1">
     <link ref="canonical" href="{{canonical_link}}" />
+
+    {{ unhide_func() }}
   </head>
 
 <style>{% include "reset.css" %}</style>
 <style>{% include "style.css" %}</style>
 
-  <body>
+  <body onload="unhide_permalink()">
     <main>
       <div class="big_title">
         <h1>{{ name }}</h1>