From b842d124a94464444ced350f8b60f32ed6f81986 Mon Sep 17 00:00:00 2001
From: grassblock <hi@imgb.space>
Date: Wed, 28 May 2025 17:32:29 +0800
Subject: [PATCH] feat: add optional minecraft avatar for authors

---
 src/content/config.ts                    |   1 +
 src/data/authors.yaml                    |   1 +
 src/pages/images/avatars/[author].png.js | 125 +++++++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 src/pages/images/avatars/[author].png.js

diff --git a/src/content/config.ts b/src/content/config.ts
index d305fc5..b250015 100644
--- a/src/content/config.ts
+++ b/src/content/config.ts
@@ -27,6 +27,7 @@ const authorsData = defineCollection({
     schema: z.object({
         name: z.string().default(siteConfig.defaultAuthor.name),
         email: z.string().email().default(siteConfig.defaultAuthor.email),
+        mcplayerid: z.string().optional(),
         social: z.object({
             twitter: z.string().optional(),
             fediverse: z.string().optional(),
diff --git a/src/data/authors.yaml b/src/data/authors.yaml
index 613201f..5cf773a 100644
--- a/src/data/authors.yaml
+++ b/src/data/authors.yaml
@@ -1,6 +1,7 @@
 Wheatley: # the key name (id) of the author, which is used in the front matter
   name: "Wheatley" # the display name of the author
   email: "hello@example.org" # the email address of the author
+  mcplayerid: "Wheatley" # the Minecraft player ID of the author, if applicable
   social: # the social media accounts of the author, if any (there is no reference for this yet except for the twitter handle)
     twitter: "@wheatley"
     fediverse: "@"
diff --git a/src/pages/images/avatars/[author].png.js b/src/pages/images/avatars/[author].png.js
new file mode 100644
index 0000000..57360b4
--- /dev/null
+++ b/src/pages/images/avatars/[author].png.js
@@ -0,0 +1,125 @@
+import { getCollection } from 'astro:content';
+
+export async function getStaticPaths() {
+    const authorsData = await getCollection('authors');
+    return authorsData.map(author => ({
+        params: { author: author.id },
+        props: { author }
+    }));
+}
+
+export async function GET({ props }) {
+    const { author } = props;
+
+    if (!author.data.mcplayerid) {
+        return new Response(null, { status: 404 });
+    }
+
+    const username = author.data.mcplayerid;
+
+    try {
+        // get Minecraft profile by username
+        const profileResponse = await fetch(`https://api.mojang.com/users/profiles/minecraft/${username}`);
+
+        if (!profileResponse.ok) {
+            return new Response('Player not found', { status: 404 });
+        }
+
+        const profile = await profileResponse.json();
+        const uuid = profile.id;
+
+        // get skin data from session server
+        const sessionResponse = await fetch(`https://sessionserver.mojang.com/session/minecraft/profile/${uuid}`);
+        const sessionData = await sessionResponse.json();
+
+        const texturesProperty = sessionData.properties.find((prop) => prop.name === 'textures');
+        const texturesData = JSON.parse(atob(texturesProperty.value));
+        const skinUrl = texturesData.textures.SKIN?.url;
+        if (!skinUrl) {
+            return new Response('Skin not found', { status: 404 });
+        }
+
+        // get skin image from the URL
+        const skinResponse = await fetch(skinUrl);
+        const skinBuffer = await skinResponse.arrayBuffer();
+
+        // render the Minecraft head image
+        const headImage = await renderMinecraftHead(new Uint8Array(skinBuffer));
+
+        return new Response(headImage, {
+            headers: {
+                'Content-Type': 'image/png',
+                'Cache-Control': 'public, max-age=3600', // 缓存1小时
+            },
+        });
+
+    } catch (error) {
+        console.error('Error fetching Minecraft head:', error);
+        return new Response('Internal server error', { status: 500 });
+    }
+}
+
+async function renderMinecraftHead(skinData) {
+    // Use sharp library to process images
+    const sharp = (await import('sharp')).default;
+
+    // Load the skin image
+    const skinImage = sharp(skinData);
+    const metadata = await skinImage.metadata();
+    const { width, height } = metadata;
+
+    // Determine skin format (64x32 old format or 64x64 new format)
+    const isNewFormat = height === 64;
+    const headSize = 8; // Head is 8x8 pixels
+    const scale = 8; // Scale factor, final output is 64x64
+
+    // 3D-like effect: slightly offset hat layer
+    // TODO: real 3D effect, which would require more complex rendering
+    const offset = -1; // Negative value moves up/left (creates 3D effect)
+
+    // Extract head base layer (8x8 pixels)
+    const headBase = await skinImage
+        .clone() // Clone to avoid modifying original
+        .extract({ left: 8, top: 8, width: headSize, height: headSize })
+        .png()
+        .toBuffer();
+
+    let finalHead = sharp(headBase).resize(headSize * scale, headSize * scale, {
+        kernel: 'nearest' // Keep pixel art style
+    });
+
+    // If new format and has hat layer, composite hat layer
+    if (isNewFormat) {
+        try {
+            // Check if we're in bounds before extracting hat layer
+            if (width >= 48 && height >= 16) {
+                // Extract hat layer (8x8 pixels)
+                const hatLayer = await skinImage
+                    .clone() // Clone to avoid modifying original
+                    .extract({ left: 40, top: 8, width: headSize, height: headSize })
+                    .png()
+                    .toBuffer();
+
+                // Resize hat layer
+                const hatResized = await sharp(hatLayer)
+                    .resize(headSize * scale, headSize * scale, { kernel: 'nearest' })
+                    .png()
+                    .toBuffer();
+
+                // Composite base layer and hat layer with offset for 3D effect
+                finalHead = finalHead.composite([{
+                    input: hatResized,
+                    left: offset * scale, // Apply scaled offset horizontally
+                    top: offset * scale,  // Apply scaled offset vertically
+                    blend: 'over'
+                }]);
+            }
+        } catch (error) {
+            // If hat layer processing fails, just use base layer
+            console.warn('Failed to process hat layer:', error);
+        }
+    }
+
+    const result = await finalHead.png().toBuffer();
+    return new Uint8Array(result);
+}
\ No newline at end of file