Workaround "Creator not found" error, and more.
// ==UserScript==
// @name Kemono Patcher
// @namespace DKKKNND
// @license WTFPL
// @match https://kemono.cr/*
// @match https://coomer.st/*
// @run-at document-start
// @grant GM_registerMenuCommand
// @grant GM_unregisterMenuCommand
// @grant GM_setValue
// @grant GM_getValue
// @version 1.4.2
// @author Kaban
// @description Workaround "Creator not found" error, and more.
// ==/UserScript==
(function() {
"use strict";
// ==<User Script>==
const MISSING_PATREON = JSON.parse(GM_getValue("MISSING_PATREON", "[]"));
const RENAME_CREATORS = JSON.parse(GM_getValue("RENAME_CREATORS", "{}"));
const PATREON_METADATA_CACHE = JSON.parse(GM_getValue("PATREON_METADATA_CACHE", '{"postIds":[]}'));
function onMutation() {
updatePageInfo();
observer.disconnect();
switch (pageInfo.pageType) {
case "Post Details":
updateImportedTime();
break;
}
observer.observe(document, { childList: true, subtree: true });
}
const observer = new MutationObserver(onMutation);
observer.observe(document, { childList: true, subtree: true });
let pageInfo = {};
function updatePageInfo() {
if (pageInfo.href === window.location.href) return;
pageInfo = {};
const pathname = window.location.pathname;
const segments = pathname.split('/').filter(segment => segment);
switch (segments.length) {
case 3: {
if (segments[1] === "user") {
pageInfo.pageType = "Creator Posts";
const service = segments[0];
const userId = segments[2];
pageInfo.userKey = `${service}-${userId}`;
}
break;
}
case 4: {
if (segments[1] === "user" && segments[3] === "community") {
pageInfo.pageType = "Creator Community";
const service = segments[0];
const userId = segments[2];
pageInfo.userKey = `${service}-${userId}`;
}
break;
}
case 5:
case 7: {
if (segments[1] === "user" && segments[3] === "post" &&
(segments[5] == undefined || segments[5] === "revision")) {
pageInfo.pageType = "Post Details";
const service = segments[0];
const userId = segments[2];
const postId = segments[4];
pageInfo.userKey = `${service}-${userId}`;
pageInfo.postKey = `${service}-${userId}-${postId}`;
}
}
}
pageInfo.href = window.location.href;
updateScriptMenu();
}
function updateScriptMenu() {
switch (pageInfo.pageType) {
case "Creator Posts":
case "Post Details":
GM_registerMenuCommand("✎ Rename Creator", renameCreator, { id: "renameCreator" });
break;
default:
GM_unregisterMenuCommand("renameCreator");
}
}
let postImported = {};
function loadImportedTime(event) { // called from page script
if (postImported.restoredKey === event.detail.postKey) return;
postImported.postKey = event.detail.postKey;
postImported.imported = event.detail.imported;
}
document.addEventListener("kp-user:load-imported-time", loadImportedTime);
function updateImportedTime() {
if (postImported.postKey !== pageInfo.postKey) return;
if (postImported.imported?.[0] === null) return; // Kemono bug (Pixiv Fanbox)
const revisionSelection = document.getElementById("post-revision-selection");
if (revisionSelection) {
const revisionOptions = revisionSelection.getElementsByTagName("option");
// switching revision causes text reset, need edit again
if (postImported.restoredKey === postImported.postKey &&
postImported.restoredText === revisionOptions[0].textContent) {
return;
}
for (let i = 0; i < revisionOptions.length; i++) {
const date = new Date(postImported.imported[i]);
const importedTime = date.toLocaleString("en-CA", { hourCycle: "h23" });
const suffix = revisionOptions[i].textContent.substring(7);
revisionOptions[i].textContent = importedTime.replace(',', '') + suffix;
}
postImported.restoredKey = postImported.postKey;
postImported.restoredText = revisionOptions[0].textContent;
return;
}
const revisionSpan = document.querySelector(".post__added span");
if (revisionSpan) {
const date = new Date(postImported.imported[0]);
const importedTime = date.toLocaleString("en-CA", { hourCycle: "h23" });
revisionSpan.lastChild.textContent = importedTime.replace(',', '');
postImported = { restoredKey: postImported.postKey };
}
}
let saveTimeout = {};
function debouncedSave(gmKey, object) {
clearTimeout(saveTimeout[gmKey]);
saveTimeout[gmKey] = setTimeout(() => {
// To Do: Make this Multi-Tab Safe
GM_setValue(gmKey, JSON.stringify(object));
}, 500);
}
function renameCreator(event) {
if (event.type === "visibilitychange") {
if (document.visibilityState !== "visible") return;
if (!pageInfo.renameCreatorFlag) return;
pageInfo.renameCreatorFlag = null;
}
if (document.visibilityState === "visible") {
const creatorName = document.querySelector(".post__user-name") ||
document.querySelector(`span[itemprop="name"]`);
const userKey = pageInfo.userKey;
const name = RENAME_CREATORS[userKey] || creatorName.textContent;
const input = prompt(`Enter new name for ${name} (${userKey}):\n(leave empty to reset)`, name);
if (input === null || input === name) return;
if (input === "") {
delete RENAME_CREATORS[userKey];
} else {
RENAME_CREATORS[userKey] = input;
}
debouncedSave("RENAME_CREATORS", RENAME_CREATORS);
document.dispatchEvent(new CustomEvent("kp-page:rename-creator", {
detail: { userKey: userKey, newName: input }
}));
creatorName.textContent = input || userKey;
} else {
if (!pageInfo.renameCreatorFlag) pageInfo.renameCreatorFlag = true; // mobile workaround
}
}
document.addEventListener("visibilitychange", renameCreator);
function addMissingPatreon(event) { // called from page script
const userId = event.detail.userId;
MISSING_PATREON.push(userId);
debouncedSave("MISSING_PATREON", MISSING_PATREON);
}
document.addEventListener("kp-user:add-missing-patreon", addMissingPatreon);
function addPatreonCache(event) { // called from page script
const postId = event.detail.postId;
PATREON_METADATA_CACHE.postIds.push(postId);
const userId = event.detail.userId;
if (!PATREON_METADATA_CACHE[userId]) PATREON_METADATA_CACHE[userId] = [];
const postJson = event.detail.postJson;
const postMetadata = {
id: postJson.id,
user: postJson.user,
service: "patreon",
title: postJson.title,
published: postJson.published,
file: { path: postJson.file.path },
attachments: '~'.repeat(postJson.attachments.length)
};
PATREON_METADATA_CACHE[userId].push(postMetadata);
debouncedSave("PATREON_METADATA_CACHE", PATREON_METADATA_CACHE);
}
document.addEventListener("kp-user:add-patreon-cache", addPatreonCache);
function purgePatreonCache(event) { // called from page script
const userId = event.detail.userId;
if (PATREON_METADATA_CACHE[userId]) {
delete PATREON_METADATA_CACHE[userId];
debouncedSave("PATREON_METADATA_CACHE", PATREON_METADATA_CACHE);
}
const missingIndex = MISSING_PATREON.indexOf(userId);
if (missingIndex > -1) {
MISSING_PATREON.splice(missingIndex, 1);
debouncedSave("MISSING_PATREON", MISSING_PATREON);
}
}
document.addEventListener("kp-user:purge-patreon-cache", purgePatreonCache);
// ==</User Script>==
// ==<Main>==
const injectScript = document.createElement("script");
injectScript.textContent = `(${patchFetch})();`;
document.documentElement.appendChild(injectScript);
document.dispatchEvent(new CustomEvent("kp-page:load-data", {
detail: {
missingPatreon: MISSING_PATREON,
renameCreators: RENAME_CREATORS,
cachedPatreonPosts: PATREON_METADATA_CACHE
}
}));
injectScript.remove();
// ==</Main>==
// ==<Injected Function>==
function patchFetch() {
let MISSING_PATREON;
let RENAME_CREATORS;
let PATREON_METADATA_CACHE;
let PATREON_METADATA_CACHE_POST_IDS;
function loadData(event) { // called from user script
// v1.4.1: This kemono bug seems to be fixed, so we don't use a persist list anymore. (Will still work on 404.)
MISSING_PATREON = new Set(); // new Set(event.detail.missingPatreon);
RENAME_CREATORS = event.detail.renameCreators;
PATREON_METADATA_CACHE = event.detail.cachedPatreonPosts;
PATREON_METADATA_CACHE_POST_IDS = new Set(PATREON_METADATA_CACHE.postIds);
}
document.addEventListener("kp-page:load-data", loadData);
function renameCreator(event) { // called from user script
const userKey = event.detail.userKey;
const newName = event.detail.newName;
if (newName === "") {
delete RENAME_CREATORS[userKey];
} else {
RENAME_CREATORS[userKey] = newName;
}
}
document.addEventListener("kp-page:rename-creator", renameCreator);
function addMissingPatreon(userId) {
if (!MISSING_PATREON.has(userId)) {
MISSING_PATREON.add(userId);
// v1.4.1: This kemono bug seems to be fixed, so we don't use a persist list anymore.
/*
document.dispatchEvent(new CustomEvent("kp-user:add-missing-patreon", {
detail: { userId: userId }
}));
*/
}
}
const FAKE_PATREON_PROFILE = function(userId) {
const userKey = `patreon-${userId}`;
const name = RENAME_CREATORS[userKey] || userKey;
const postCount = PATREON_METADATA_CACHE[userId]?.length || 0;
const response = {
id: userId,
name: name,
has_chats: true,
post_count: postCount,
service: "patreon"
};
return new Response(JSON.stringify(response));
};
const FAKE_PATREON_POSTS = function(userId, offset) {
offset = parseInt(offset) || 0;
const cachedPosts = PATREON_METADATA_CACHE[userId] || [];
return new Response(JSON.stringify(cachedPosts.slice(offset, offset + 50)));
};
const nativeFetch = window.fetch.bind(window);
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
const silent429Fetch = async function (input, init) {
try {
const response = await nativeFetch(input, init);
if (response.status === 429) {
const MAX_RETRIES = 3;
let attempt = 0;
let delay = 500;
while (attempt < MAX_RETRIES) {
attempt++;
console.log(`HTTP 429: ${window.location.href}\nRetry (attempt ${attempt}/${MAX_RETRIES}) in ${delay} ms...`);
await sleep(delay);
delay += 500; // backoff for next retry
const response = await nativeFetch(input, init);
if (response.ok || response.status !== 429 || attempt === MAX_RETRIES) {
return response;
}
}
}
return response;
} catch (error) {
throw error;
}
};
window.fetch = async function(input, init) {
let url;
if (input instanceof Request) {
url = new URL(input.url);
} else if (typeof input === "string") {
try {
url = new URL(input, location.origin);
} catch (error) {
return nativeFetch(input, init);
}
} else {
return nativeFetch(input, init);
}
if (!url.pathname.startsWith("/api/v1/")) {
return nativeFetch(input, init);
}
switch (url.pathname) {
case "/api/v1/posts":
case "/api/v1/posts/popular": {
return silent429Fetch(input, init);
}
}
const segments = url.pathname.split('/').filter(segment => segment);
if (segments.length < 6 || segments[3] !== "user") {
return nativeFetch(input, init);
}
const service = segments[2];
const userId = segments[4];
const apiName = segments[5];
switch (apiName) {
case "profile": {
if (segments.length !== 6) {
return nativeFetch(input, init);
}
if (service === "patreon" && MISSING_PATREON.has(userId)) {
return FAKE_PATREON_PROFILE(userId);
}
try {
const response = await nativeFetch(input, init);
if (response.ok) {
document.dispatchEvent(new CustomEvent("kp-user:purge-patreon-cache", {
detail: { userId: userId }
}));
const newName = RENAME_CREATORS[`${service}-${userId}`];
if (newName) {
const responseJSON = await response.json();
responseJSON.name = newName;
return new Response(JSON.stringify(responseJSON),
{ status: response.status, headers: response.headers }
);
}
} else if (response.status === 404 && service === "patreon") {
addMissingPatreon(userId);
return FAKE_PATREON_PROFILE(userId);
}
return response;
} catch (error) {
return nativeFetch(input, init);
}
}
case "posts": {
if (segments.length !== 6) {
return nativeFetch(input, init);
}
const offset = new URLSearchParams(url.search).get("o");
if (service === "patreon" && MISSING_PATREON.has(userId)) {
return FAKE_PATREON_POSTS(userId, offset);
}
try {
const response = await silent429Fetch(input, init);
if (response.status === 404 && service === "patreon") {
return FAKE_PATREON_POSTS(userId, offset);
}
return response;
} catch (error) {
return nativeFetch(input, init);
}
}
case "post": {
if (!(segments.length === 7 ||
(segments.length === 9 && segments[7] === "revision"))) {
return nativeFetch(input, init);
}
const postId = segments[6];
try {
const response = await nativeFetch(input, init);
if (response.ok) {
const responseJSON = await response.json();
const imported = [];
const revisions = responseJSON.props.revisions;
for (const revision of responseJSON.props.revisions) {
imported.push(revision[1].added); // second element is post object
}
// Kemono front end cuts off imported date, send raw data to user script
document.dispatchEvent(new CustomEvent("kp-user:load-imported-time", {
detail: { postKey: `${service}-${userId}-${postId}`, imported: imported }
}));
// To Do: make a "white list" for creators do exist so no need for caching
if (service === "patreon" && !PATREON_METADATA_CACHE_POST_IDS.has(postId)) {
document.dispatchEvent(new CustomEvent("kp-user:add-patreon-cache", {
detail: { userId: userId, postId: postId, postJson: responseJSON["post"] }
}));
PATREON_METADATA_CACHE_POST_IDS.add(postId);
}
return new Response(JSON.stringify(responseJSON),
{ status: response.status, headers: response.headers }
);
}
} catch (error) {
return nativeFetch(input, init);
}
}
}
return nativeFetch(input, init);
};
}
// ==</Injected Function>==
})();