From d4906fda5ee77435cbc8bbaf72716756aee887b3 Mon Sep 17 00:00:00 2001
From: lifegpc <g1710431395@gmail.com>
Date: Sun, 1 Jan 2023 13:07:56 +0800
Subject: [PATCH] Create ehentai_better_viewer.user.js

---
 ehentai_better_viewer.user.js | 98 +++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 ehentai_better_viewer.user.js

diff --git a/ehentai_better_viewer.user.js b/ehentai_better_viewer.user.js
new file mode 100644
index 0000000..239b344
--- /dev/null
+++ b/ehentai_better_viewer.user.js
@@ -0,0 +1,98 @@
+// ==UserScript==
+// @name         E-Hentai better viewer
+// @namespace    https://github.com/lifegpc/userscript
+// @version      0.1
+// @description  Add a viewer to view original picture on website. Also support cache pictures to reduce Image Limit cost.
+// @author       lifegpc
+// @match        https://*.e-hentai.org/s/*/*
+// @icon         https://e-hentai.org/favicon.ico
+// @grant        GM_getResourceText
+// @grant        GM_addElement
+// @grant        GM_addStyle
+// @grant        GM_xmlhttpRequest
+// @require      https://github.com/lifegpc/viewerjs/raw/main/dist/viewer.min.js
+// @resource     viewercss https://github.com/lifegpc/viewerjs/raw/main/dist/viewer.min.css
+// @run-at       document-start
+// @connect      hath.network
+// @connect      e-hentai.org
+// ==/UserScript==
+GM_addStyle(GM_getResourceText("viewercss"));
+GM_addElement('script', { textContent: GM_getResourceText('viewer') });
+async function fetchData(url) {
+    return new Promise((resolve, reject) => {
+        GM_xmlhttpRequest({method: 'GET', url, cookie: document.cookie, responseType: 'blob', onabort: reject, onerror: reject, onload: /**@param {{responseHeaders: string}} res*/(res) => {
+            console.log(res);
+            let headers = new Headers();
+            res.responseHeaders.split("\r\n").forEach((v) => {
+                v = v.trim();
+                if (!v.length) return;
+                let s = v.split(":");
+                headers.append(s[0], s.slice(1).join(":"));
+            });
+            resolve(new Response(res.response, {status: res.status, statusText: res.statusText, headers}));
+        }})
+    })
+}
+window.addEventListener("DOMContentLoaded", () => {
+    let img = document.getElementById("img");
+    let parent = img.parentElement;
+    parent.replaceWith(img);
+    let options = {
+        title: () => {
+            return document.getElementsByTagName("h1")[0].innerText
+        },
+        navbar: false
+    };
+    /**@type {HTMLAnchorElement}*/
+    let original = document.querySelector("#i7>a");
+    if (original != null) {
+        let ourl = original.href;
+        console.log(ourl);
+        let getData = async () => {
+            let url = new URL(ourl);
+            url.searchParams.delete("key");
+            let curl = url.toString();
+            let cache = await caches.open("original-image");
+            let res = await cache.match(curl);
+            if (res === undefined) {
+                res = await fetchData(ourl, {mode: "no-cors", redirect: "follow"});
+                console.log(res.status, res.statusText);
+                if (!res.ok) throw new TypeError("Bad response status");
+                await cache.put(curl, res);
+                console.log("Added to cache:", curl);
+                res = await cache.match(curl);
+            } else console.log("Cache hited:", curl);
+            return res;
+        }
+        options.url = async () => {
+            let res = await getData();
+            return URL.createObjectURL(await res.blob());
+        }
+        original.href = 'javascript:void(0)';
+        let clickE = async () => {
+            let res = await getData();
+            original.href = URL.createObjectURL(await res.blob());
+            function get_download_name() {
+                if (res && res.headers.has("content-disposition")) {
+                    let v = res.headers.get("content-disposition");
+                    let s = v.split("filename=");
+                    if (s.length > 1) return s[1].trim();
+                }
+                return '';
+            }
+            original.download = get_download_name();
+            original.removeEventListener("click", clickE);
+            original.click();
+        };
+        original.addEventListener('click', clickE);
+    }
+    console.log(options);
+    let viewer = new Viewer(img, options);
+    let click = async () => {
+        img.removeEventListener("click", click);
+        await viewer.init();
+        console.log("Inited complete");
+        await viewer.show();
+    };
+    img.addEventListener("click", click);
+})