docker!

.gitignore

@@ -1,3 +1,4 @@
 cache/
 out/
 node_modules/
+docker-compose.yml

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:18 as build
+
+WORKDIR /build/app
+COPY package.json pnpm-lock.yaml tsconfig.json /build/app/
+COPY src /build/app/src/
+COPY web /build/app/web/
+RUN corepack enable
+RUN corepack prepare pnpm@latest --activate
+RUN pnpm install
+RUN pnpm run build
+
+FROM node:18 as run
+WORKDIR /app
+COPY --from=build /build/app/ /app/
+CMD ["node", "out"]

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 2024  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

docker-compose.example.yml

@@ -0,0 +1,8 @@
+services:
+  picvatar:
+    build: .
+    restart: unless-stopped
+    volumes:
+      - ./cache:/app/cache
+    ports:
+      - 3000:3000

package.json

@@ -13,11 +13,20 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
+    "@types/color": "^3.0.6",
+    "@types/express": "^4.17.21",
+    "@types/morgan": "^1.9.9",
     "@types/node": "^20.14.2",
+    "@types/seedrandom": "^3.0.8",
     "typescript": "^5.4.5"
   },
   "dependencies": {
     "axios": "^1.7.2",
-    "isolated-vm": "^5.0.0"
+    "canvas": "^2.11.2",
+    "color": "^4.2.3",
+    "express": "^4.19.2",
+    "isolated-vm": "^5.0.0",
+    "morgan": "^1.10.0",
+    "seedrandom": "^3.0.5"
   }
 }

src/index.ts

@@ -1,142 +1,59 @@
-import path from "path";
-import { fileURLToPath } from "url";
-import fs from "fs/promises";
 import axios from "axios";
-import { createWriteStream } from "fs";
+import express from "express";
-import ivm from "isolated-vm";
+import crypto from "crypto";
+import { generatePicrew } from "./picrew.js";
+import { dirname, isValidSha256 } from "./util.js";
+import { HttpRespondError } from "./types.js";
+import path from "path";
+import morgan from "morgan";
 
-const dirname = path.dirname(fileURLToPath(import.meta.url));
+const app = express();
 
-type Item = {
+app.use(morgan("tiny"));
-    itmId: number,
-    thumbUrl: string,
-    typeId: 1,
-}
 
-type Plist = {
+app.get("/generate/:makerid/:hash", async (req: express.Request, res: express.Response) => {
-    pId: number,
+    try {
-    cpId: string, // Used to index into cpList
+        const makerid = req.params.makerid as string;
-    lyrs: number[],
+        const hash = req.params.hash as string;
-    defItmId: number,
-    items: Item[],
-}[];
 
-type Cplist = {
+        if (!isValidSha256(hash)) return res.status(400).send("The hash you provided is not a valid hex-encoded sha256 hash.");
-    [key: string]: {
+        if (isNaN(Number(makerid))) return res.status(400).send("You did not provide a valid Picrew maker ID.");
-        cId: number, // Colour ID
-        cd: string, // Colour hex code
-    }[];
-}
 
-type CommonImages = {
+        if (["true", "1"].includes(`${req.query.gravatar || ""}`.toLowerCase())) {
-    [key: string]: {
+            const gravatarExists = !!(await axios.head(`https://gravatar.com/avatar/${hash}?d=404`).catch(() => false));
-        [key: string]: {
+
-            [key: string]: {
+            if (gravatarExists) {
-                url: string;
+                console.log(`Redirecting to Gravatar: ${hash}`);
+                return res.redirect(`https://gravatar.com/avatar/${hash}?s=256`);
             }
         }
-    }
-}
 
-async function downloadToPath(url: string, path: string) {
+        const path = await generatePicrew(hash, makerid);
-    const stream = createWriteStream(path);
+        res.sendFile(path);
-    const response = await axios.get(url, { responseType: "stream" });
+    } catch(e) {
-    response.data.pipe(stream);
+        console.log(e);
-    await new Promise<void>(r => stream.once('finish', () => { stream.close(); r(); }));
+        if (e instanceof HttpRespondError) {
-}
+            res.status(e.statusCode).send(e.message);
-
+        } else {
-/**
+            res.status(500).send(`${e}`);
- * Downloads the maker's HTML file and extracts the script from it,
- * unless it is already cached.
- */
-async function fetchScript(makerId: string) {
-    const cacheDir   = path.join(dirname, "..", "cache", makerId);
-    const htmlPath   = path.join(cacheDir, "index.html");
-    const scriptPath = path.join(cacheDir, "script.js");
-
-    await fs.mkdir(cacheDir, { recursive: true })
-        .catch((e) => { if (e?.code != "EEXIST") throw e; }); // Ignore "already exists" error
-
-    const htmlExists = (await fs.stat(htmlPath).catch((e) => false)) !== false;
-    const scriptExists = (await fs.stat(scriptPath).catch((e) => false)) !== false;
-
-    if (!htmlExists) {
-        await downloadToPath(`https://picrew.me/en/image_maker/${encodeURIComponent(makerId)}`, htmlPath);
-    }
-
-    if (!scriptExists) {
-        const text = await fs.readFile(htmlPath, { encoding: "utf8" });
-
-        const START_MATCHER = "<script>window.__NUXT__=",
-              END_MATCHER = "));</script>";
-
-        const startIndex = text.indexOf(START_MATCHER),
-              endIndex   = text.indexOf(END_MATCHER);
-
-        const script = text.substring(startIndex, endIndex + END_MATCHER.length)
-            .replace(/^\<script\>/, "")
-            .replace(/\<\/script\>$/, "")
-            .replace("window.__NUXT__=", "");
-
-        await fs.writeFile(scriptPath, script);
-    }
-}
-
-async function extractDataFromScript(makerId: string) {
-    const code = await fs.readFile(path.join(dirname, "..", "cache", makerId, "script.js"), { encoding: "utf8" });
-    const isolate = new ivm.Isolate();
-    const context = await isolate.createContext();
-    const script = await isolate.compileScript(code);
-    const res = await script.run(context, { copy: true });
-
-    const { config, commonImages, picrewData } = res.state;
-    return {
-        config: res.state.config as { pList: Plist, cpList: Cplist },
-        commonImages: res.state.commonImages as CommonImages,
-        cdnRoot: picrewData.cdnRoot,
-    };
-}
-
-await fetchScript("1904634");
-const { config, commonImages, cdnRoot } = await extractDataFromScript("1904634");
-
-type UrlsList = { colorId: string, url: string };
-type LayerList = { layerId: string, urls: UrlsList[] };
-type ItemList = { itemId: string, layers: LayerList[] };
-type LayerColorList = { layerIndex: number, cpId: string, colors: string[] };
-
-const items: ItemList[] = [];
-const layerColors: LayerColorList[] = [];
-
-for (const c in config.pList) {
-    const category = config.pList[c];
-
-    layerColors.push({
-        layerIndex: Number(c),
-        cpId: category.cpId,
-        colors: config.cpList[category.cpId].map((c) => c.cId.toString()),
-    });
-
-    for (const item of category.items) {
-        const id = item.itmId;
-
-        const obj = commonImages[id];
-        const layers: LayerList[] = [];
-
-        for (const layer of category.lyrs) {
-            if (!obj[layer]) continue; // Not every entry uses all layers
-            const variants = Object.keys(obj[layer]);
-
-            const urls: UrlsList[] = variants.map((v) => ({
-                colorId: v,
-                url: cdnRoot + obj[layer][v].url,
-            }));
-
-            layers.push({ layerId: layer.toString(), urls });
         }
-        
-        items.push({ itemId: id.toString(), layers: layers });
     }
-}
+});
 
-console.log(layerColors);
+app.get("/generate-by-email/:makerid/:email", async (req: express.Request, res: express.Response) => {
+    const hash = crypto.createHash("sha256").update(req.params.email).digest("hex");
+    const url = path.join("/", "generate", req.params.makerid, hash);
+
+    const params = new URLSearchParams();
+    for (const [k, v] of Object.entries(req.query)) {
+        if (typeof v == "string") params.append(k, v);
+    }
+
+    res.redirect(url + (params.size ? "?" + params.toString() : ""));
+});
+
+app.use(express.static(path.join(dirname, "..", "web")));
+
+// 1904634
+
+app.listen(3000, () => console.log("Listening on http://127.0.0.1:3000"));

src/picrew.ts

@@ -0,0 +1,141 @@
+import { createCanvas, loadImage } from "canvas";
+import { fetchScript, extractDataFromScript, getAsset, dirname } from "./util.js";
+import fs from "fs/promises";
+import path from "path";
+import Color from "color";
+import seedrandom from "seedrandom";
+
+// Generates a picrew from a given maker ID using the provided hash.
+// Returns the output file path.
+export async function generatePicrew(hash: string, maker: string) {
+    console.log(`Request for ${hash}:${maker}`);
+
+    const outDir = path.join(dirname, "..", "cache", "outputs", maker);
+    const filePath = path.join(outDir, hash + ".png");
+
+    // If the file is already cached, just send that again
+    if (!!(await fs.stat(filePath).catch(() => false))) {
+        console.log(`${hash}:${maker} already exists, responding with cached file`);
+        return filePath;
+    }
+
+    const rng = seedrandom(hash);
+
+    await fetchScript(maker);
+    const { config, commonImages, cdnRoot, partsId2Index } = await extractDataFromScript(maker);
+
+    type UrlsList = { colorId: string, url: string };
+    type LayerList = { layerId: string, urls: UrlsList[] };
+    type ItemList = { itemId: string, layers: LayerList[] };
+    type LayerColorList = { layerIndex: number, cpId: string, colors: string[] };
+    type CategoryList = { cpId: string, pId: string, items: ItemList[], index: number, isRmv: boolean };
+
+    const exclusions: number[][] = Object.values(config.ruleList)
+        .filter((rule) => rule.pId == 0) // Not sure what pId is but just to be sure that this won't break something else
+        .map((rule) => rule.list);
+
+    const items: ItemList[] = [];
+    const categories: CategoryList[] = [];
+    const layerColors: LayerColorList[] = [];
+
+    for (const c in config.pList) {
+        const category = config.pList[c];
+
+        layerColors.push({
+            layerIndex: Number(c),
+            cpId: category.cpId,
+            colors: config.cpList[category.cpId].map((c) => c.cId.toString()),
+        });
+
+        const localItems: ItemList[] = [];
+        for (const item of category.items) {
+            const id = item.itmId;
+
+            const obj = commonImages[id];
+            const layers: LayerList[] = [];
+
+            for (const layer of category.lyrs) {
+                if (!obj[layer]) continue; // Not every entry uses all layers
+                const variants = Object.keys(obj[layer]);
+
+                const urls: UrlsList[] = variants.map((v) => ({
+                    colorId: v,
+                    url: cdnRoot + obj[layer][v].url,
+                }));
+
+                layers.push({ layerId: layer.toString(), urls });
+            }
+
+            localItems.push({ itemId: id.toString(), layers: layers });
+        }
+
+        items.push(...localItems);
+        categories.push({
+            cpId: category.cpId,
+            pId: category.pId.toString(),
+            items: localItems,
+            index: partsId2Index[category.pId.toString()],
+            isRmv: !!category.isRmv,
+        });
+    }
+
+    const images: { layer: number, url: string, categoryId: number }[] = [];
+
+    categoryLoop: for (const category of categories.sort((a, b) => b.index - a.index)) {
+        const canHide = category.isRmv;
+        const inRuleset = exclusions.find((arr) => arr.includes(Number(category.pId)));
+
+        if (canHide) {
+            // If there's other things that would be blocked by this,
+            // it should possible for this one to be hidden so
+            // the other item can appear too.
+            if (rng() < (inRuleset ? 0.5 : 0)) continue;
+        }
+
+        // Check if a conflicting object already exists, and if so, skip this one
+        for (const rule of exclusions) {
+            if (rule.includes(Number(category.pId))) {
+                if (images.find((i) => rule.includes(i.categoryId))) continue categoryLoop;
+            }
+        }
+
+        const colors = layerColors.find((c) => c.cpId == category.cpId)!.colors;
+        const colorId = colors[Math.floor(rng() * colors.length)];
+        const item = category.items[Math.floor(rng() * category.items.length)];
+
+        for (const layer of item.layers) {
+            const url = (layer.urls.find((i) => i.colorId == colorId) ?? layer.urls?.[0])?.url;
+
+            if (url) {
+                images.push({ layer: Number(layer.layerId), url, categoryId: Number(category.pId) });
+            }
+        }
+    }
+
+    const canvas = createCanvas(config.w, config.h);
+    const ctx = canvas.getContext('2d');
+
+    // So we don't accidentally end up with a transparent background
+    const bgCol = Color.hsv(Math.floor(rng() * 360), 20, 100).hex();
+    ctx.fillStyle = bgCol;
+    ctx.fillRect(0, 0, config.w, config.h);
+
+    // Retains the correct order
+    const imgPaths = await Promise.all(
+        images
+            .sort((a, b) => config.lyrList[a.layer] - config.lyrList[b.layer])
+            .map((img) => getAsset(img.url))
+    );
+
+    for (const path of imgPaths) {
+        const img = await loadImage(path);
+        ctx.drawImage(img, 0, 0, config.w, config.h);
+    }
+    await fs.mkdir(outDir, { recursive: true })
+        .catch((e) => { if (e?.code != "EEXIST") throw e; }); // Ignore "already exists" error
+
+    await fs.writeFile(filePath, canvas.toBuffer());
+
+    console.log(`Generated ${hash}:${maker}, responding with generated file`);
+    return filePath;
+}

src/types.ts

@@ -0,0 +1,65 @@
+export type Item = {
+    itmId: number,
+    thumbUrl: string,
+    typeId: 1,
+}
+
+export type Plist = {
+    pId: number,
+    cpId: string, // Used to index into cpList
+    lyrs: number[],
+    defItmId: number,
+    isRmv: number, // 0 if not removable
+    items: Item[],
+}[];
+
+export type Cplist = {
+    [key: string]: {
+        cId: number, // Colour ID
+        cd: string, // Colour hex code
+    }[];
+}
+
+export type Lyrlist = {
+    [key: number]: number;
+}
+
+export type RuleList = {
+    [key: number]: {
+        list: number[],
+        pId: number,
+    }
+}
+
+export type Config = {
+    pList: Plist,
+    cpList: Cplist,
+    lyrList: Lyrlist,
+    ruleList: RuleList,
+    w: number,
+    h: number,
+
+};
+
+export type CommonImages = {
+    [key: string]: {
+        [key: string]: {
+            [key: string]: {
+                url: string;
+            }
+        }
+    }
+}
+
+export type PartsId2Index = {
+    [key: string]: number;
+}
+
+export class HttpRespondError extends Error {
+    statusCode: number;
+
+    constructor(message: string, statusCode: number) {
+        super(message);
+        this.statusCode = statusCode;
+    }
+}

src/util.ts

@@ -0,0 +1,105 @@
+import path from "path";
+import { fileURLToPath, URL } from "url";
+import fs from "fs/promises";
+import axios, { AxiosError } from "axios";
+import { createWriteStream } from "fs";
+import ivm from "isolated-vm";
+import { CommonImages, Config, HttpRespondError, PartsId2Index } from "./types.js";
+
+export const dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export const fsExists = async (path: string) => (await fs.stat(path).catch((e) => false)) !== false;
+
+export async function downloadToPath(url: string, path: string) {
+    const stream = createWriteStream(path);
+    const response = await axios.get(url, { responseType: "stream" });
+    response.data.pipe(stream);
+    await new Promise<void>(r => stream.once('finish', () => { stream.close(); r(); }));
+}
+
+/**
+ * Downloads the maker's HTML file and extracts the script from it,
+ * unless it is already cached.
+ */
+export async function fetchScript(makerId: string) {
+    const cacheDir   = path.join(dirname, "..", "cache", "picrew", makerId);
+    const htmlPath   = path.join(cacheDir, "index.html");
+    const scriptPath = path.join(cacheDir, "script.js");
+
+    await fs.mkdir(cacheDir, { recursive: true })
+        .catch((e) => { if (e?.code != "EEXIST") throw e; }); // Ignore "already exists" error
+
+    const htmlExists = await fsExists(htmlPath);
+    const scriptExists = await fsExists(scriptPath);
+
+    if (!htmlExists) {
+        try {
+            await downloadToPath(`https://picrew.me/en/image_maker/${encodeURIComponent(makerId)}`, htmlPath);
+        } catch(e) {
+            await fs.unlink(htmlPath).catch(() => {});
+            if (e instanceof AxiosError && e.status == 404) {
+                throw new HttpRespondError(`There is no Picrew maker with ID ${makerId}.`, 400);
+            }
+            else throw e;
+        }
+    }
+
+    if (!scriptExists) {
+        const text = await fs.readFile(htmlPath, { encoding: "utf8" });
+
+        const START_MATCHER = "<script>window.__NUXT__=",
+              END_MATCHER = "));</script>";
+
+        const startIndex = text.indexOf(START_MATCHER),
+              endIndex   = text.indexOf(END_MATCHER);
+
+        const script = text.substring(startIndex, endIndex + END_MATCHER.length)
+            .replace(/^\<script\>/, "")
+            .replace(/\<\/script\>$/, "")
+            .replace("window.__NUXT__=", "");
+
+        await fs.writeFile(scriptPath, script);
+    }
+}
+
+export async function extractDataFromScript(makerId: string) {
+    const code = await fs.readFile(path.join(dirname, "..", "cache", "picrew", makerId, "script.js"), { encoding: "utf8" });
+    const isolate = new ivm.Isolate();
+    const context = await isolate.createContext();
+    const script = await isolate.compileScript(code);
+    const res = await script.run(context, { copy: true });
+    return {
+        config: res.state.config as Config,
+        commonImages: res.state.commonImages as CommonImages,
+        cdnRoot: res.state.picrewData.cdnRoot,
+        partsId2Index: res.state.partsId2Index as PartsId2Index,
+    };
+}
+
+/**
+ * Download an asset if it's not cached already, then
+ * return its file path.
+ */
+export async function getAsset(url: string) {
+    // https://cdn.picrew.me/app/image_maker/{makerId}/{pId}/{random_string}.png
+    const [ makerId, cId, filename ] = new URL(url).pathname.split("/").slice(-3);
+
+    //console.log(`Starting download: ${makerId}/${cId}/${filename}`);
+
+    const dir = path.join(dirname, "..", "cache", "assets", makerId, cId);
+    const filePath = path.join(dir, filename);
+
+    await fs.mkdir(dir, { recursive: true })
+        .catch((e) => { if (e?.code != "EEXIST") throw e; }); // Ignore "already exists" error
+
+    if (!await fsExists(filePath)) {
+        await downloadToPath(url, filePath);
+    }
+
+    //console.log(`Finished download: ${makerId}/${cId}/${filename}`);
+    return filePath;
+}
+
+export async function isValidSha256(hash: string) {
+    return /^[0-9A-f]{64}$/.test(hash);
+}

tsconfig.json

@@ -25,9 +25,9 @@
     // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
 
     /* Modules */
-    "module": "ESNext",                                  /* Specify what module code is generated. */
+    "module": "Node16",                                  /* Specify what module code is generated. */
     "rootDir": "./src",                                  /* Specify the root folder within your source files. */
-    "moduleResolution": "Node",                          /* Specify how TypeScript looks up a file from a given module specifier. */
+    "moduleResolution": "Node16",                        /* Specify how TypeScript looks up a file from a given module specifier. */
     // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
     // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
     // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */

web/index.html

@@ -0,0 +1,124 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>Picvatar</title>
+        <style>
+            body {
+                width: min(calc(100% - 16px), 50em);
+                margin: auto;
+            }
+
+            .input-wrapper {
+                display: flex;
+                flex-direction: row;
+                gap: 8px;
+            }
+
+            .input-field {
+                display: flex;
+                flex-direction: column;
+                width: 100%;
+            }
+
+            .image-wrapper {
+                width: 50%;
+                margin: auto;
+                padding: 3em 0;
+            }
+
+            .output-img {
+                border-radius: 2em;
+            }
+        </style>
+    </head>
+    <body>
+        <h1 id="picvatar">Picvatar</h1>
+        <p>Generate unique avatars from a Picrew - Like Gravatar, but cooler!</p>
+
+        <div class="input-wrapper">
+            <div class="input-field">
+                <label for="email-input">Email address</label>
+                <input id="email-input" type="text" placeholder="webmistress@amogus.cloud" />
+            </div>
+            <div class="input-field">
+                <label for="maker-input">Picrew maker ID</label>
+                <input id="maker-input" type="text" placeholder="47882" value="47882" />
+            </div>
+            <button style="height: 50%; align-self: flex-end;" onclick="generate()">Generate!</button>
+        </div>
+
+        <div class="image-wrapper">
+            <img
+                class="output-img"
+                id="output-img"
+                src="/kitty.png"
+                style="width: 100%; height: auto;"
+            />
+        </div>
+
+        <h3 id="api">API</h3>
+
+        <h4 id="api-from-sha256">Generate an image from a sha256 hash</h4>
+        <b><code>/generate/:makerid/:hash?gravatar=bool</code></b>
+        <p>
+            <b>Returns:</b> The generated image in png format.
+        </p>
+        <p>
+            <code>:makerid</code> - The ID of the Picrew maker you want to use. You can get this from the Picrew URL: <code>https://picrew.me/en/image_maker/000000</code>
+        </p>
+        <p>
+            <code>:hash</code> - Hex-encoded sha256 hash of the email address (or whatever other identifier you want to use).
+        </p>
+        <p>
+            <code>?gravatar=bool</code> - If this is set to <code>true</code> or <code>1</code>, and the provided hash belongs to an email on Gravatar that has a custom avatar set, a redirect to that avatar will be returned and no Picrew will be generated. Any other value will disable this behaviour.
+            <br />
+            Note that this will slow down load times.
+        </p>
+
+        <h4 id="api-from-email">Generate an image from an email address</h4>
+        <b><code>/generate/:makerid/:email</code></b>
+        <p>
+            <b>Returns:</b> a redirect to <code>/generate/:makerid/:hash</code>, where <code>:hash</code> is a sha256 hash created from the provided email address. This is useful when you don't have access to relevant APIs to generate a sha256 hash, such as on a vanilla JS website without external dependencies.
+            <br />
+            Query parameters will be forwarded, so any parameters for <code>/generate/:makerid/:hash</code> are available.
+        </p>
+        <p>
+            <code>:makerid</code> - <a href="#api-from-sha256">See above.</a>
+        </p>
+        <p>
+            <code>:email</code> - The email address you want to generate an avatar for. Make sure this is URL-encoded!
+        </p>
+    </body>
+
+    <h3>The boring stuff</h3>
+    <p>
+        If you plan on using this, please respect the copyright and license of the Picrew - it's not my job to enforce other people's copyright, so please be reasonable. I also recommend self-hosting this - a Dockerfile and example docker-compose config is provided in the repository.
+    </p>
+    <p>
+        This is a one-day side project of mine that I'll likely never touch again, but the source code is available <a href="https://git.amogus.cloud/Lea/picvatar" target="_blank">here</a>. <br />
+        Reverse engineering Picrew and trying to figure out how to use the available data to manually render images was a fun challenge, but it is nothing I intend to put long term maintenance into. If you find a bug, feel free to report it, but if Picrew completely changes their backend then I will likely not rewrite everything from scratch to accomodate that.
+    </p>
+    <p>
+        Enjoy &lt;3
+    </p>
+
+    <script>
+        const outputImg = document.getElementById("output-img");
+    
+        outputImg.onerror = (event) => {
+            if (outputImg.src != '/kitty.png') outputImg.src = '/kitty.png';
+            alert(`Ooprs! That didn't work: ${JSON.stringify(event)}`);
+        }
+    
+        function generate() {
+            const email = document.getElementById("email-input").value;
+            const maker = document.getElementById("maker-input").value;
+    
+            if (!email || !maker) return;
+    
+            const url = `/generate-by-email/${encodeURIComponent(maker)}/${encodeURIComponent(email)}`;
+            outputImg.src = url;
+        }
+    </script>
+</html>