Initial commit: Crafty Mod Installer

modrinth.js

@@ -0,0 +1,76 @@
+const axios = require('axios');
+const fs = require('fs-extra');
+const path = require('path');
+const AdmZip = require('adm-zip');
+
+class ModrinthHandler {
+    constructor() {
+        this.client = axios.create({
+            baseURL: 'https://api.modrinth.com/v2',
+            headers: { 'User-Agent': 'CraftyModInstaller/1.0.0' }
+        });
+    }
+
+    async getProject(id) {
+        const resp = await this.client.get(`/project/${id}`);
+        return resp.data;
+    }
+
+    async getVersion(versionId) {
+        const resp = await this.client.get(`/version/${versionId}`);
+        return resp.data;
+    }
+
+    async downloadFile(url, targetPath) {
+        const response = await axios({
+            url,
+            method: 'GET',
+            responseType: 'stream'
+        });
+        const writer = fs.createWriteStream(targetPath);
+        response.data.pipe(writer);
+        return new Promise((resolve, reject) => {
+            writer.on('finish', resolve);
+            writer.on('error', reject);
+        });
+    }
+
+    async installModpack(versionId, targetDir) {
+        console.log(`Downloading Modrinth pack version: ${versionId}...`);
+        const version = await this.getVersion(versionId);
+        const mrpackFile = version.files.find(f => f.filename.endsWith('.mrpack'));
+        
+        if (!mrpackFile) throw new Error('No .mrpack file found in this version');
+
+        const tempPath = path.join(process.cwd(), 'temp_pack.mrpack');
+        await this.downloadFile(mrpackFile.url, tempPath);
+
+        const zip = new AdmZip(tempPath);
+        const indexEntry = zip.getEntry('modrinth.index.json');
+        if (!indexEntry) throw new Error('Invalid .mrpack: missing modrinth.index.json');
+
+        const index = JSON.parse(zip.readAsText(indexEntry));
+        
+        // Ensure mods directory exists
+        const modsDir = path.join(targetDir, 'mods');
+        await fs.ensureDir(modsDir);
+
+        console.log(`Downloading ${index.files.length} mods...`);
+        for (const file of index.files) {
+            const destPath = path.join(targetDir, file.path);
+            await fs.ensureDir(path.dirname(destPath));
+            console.log(`  Downloading ${path.basename(file.path)}...`);
+            await this.downloadFile(file.downloads[0], destPath);
+        }
+
+        // Handle overrides
+        console.log('Applying overrides...');
+        zip.extractAllTo(targetDir, true); // This is a simplification; should only extract 'overrides' folder
+        // TODO: Properly merge overrides folder contents into root
+        
+        await fs.remove(tempPath);
+        console.log('Modpack installation complete!');
+    }
+}
+
+module.exports = ModrinthHandler;