@voilajsx/appkit
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Minimal and framework agnostic Node.js toolkit designed for AI agentic backend development
470 lines • 17.9 kB
JavaScript
/**
* Cloudflare R2 storage strategy with zero egress fees and automatic CDN integration
* @module @voilajsx/appkit/storage
* @file src/storage/strategies/r2.ts
*
* @llm-rule WHEN: App has CLOUDFLARE_R2_BUCKET env var for cost-effective distributed storage
* @llm-rule AVOID: Manual R2 setup - this handles connection, CDN integration, and S3-compatible API
* @llm-rule NOTE: Production-ready with zero egress fees, automatic CDN, S3-compatible operations
*/
/**
* Cloudflare R2 storage strategy with cost optimization and CDN integration
*/
export class R2Strategy {
config;
r2Client = null;
connected = false;
bucket;
accountId;
cdnUrl;
endpoint;
/**
* Creates R2 strategy with direct environment access (like auth pattern)
* @llm-rule WHEN: Storage initialization with Cloudflare R2 environment variables detected
* @llm-rule AVOID: Manual R2 configuration - environment detection handles Cloudflare specifics
*/
constructor(config) {
this.config = config;
if (!config.r2) {
throw new Error('R2 storage configuration missing');
}
this.bucket = config.r2.bucket;
this.accountId = config.r2.accountId;
this.cdnUrl = config.r2.cdnUrl;
// Build R2 endpoint URL
this.endpoint = `https://${this.accountId}.r2.cloudflarestorage.com`;
}
/**
* Connects to Cloudflare R2 with automatic account validation
* @llm-rule WHEN: Storage initialization or reconnection after failure
* @llm-rule AVOID: Manual R2 client setup - this handles Cloudflare-specific configuration
*/
async connect() {
if (this.connected)
return;
try {
// Dynamic import for S3 client (R2 is S3-compatible)
const { S3Client } = await import('@aws-sdk/client-s3');
const r2Config = this.config.r2;
// Build R2 client configuration (S3-compatible)
const clientConfig = {
region: 'auto', // R2 uses 'auto' region
endpoint: this.endpoint,
credentials: {
accessKeyId: r2Config.accessKeyId,
secretAccessKey: r2Config.secretAccessKey,
},
forcePathStyle: false, // R2 uses virtual-hosted-style
maxAttempts: 3, // Built-in retry logic
};
// Create R2 client using S3 SDK
this.r2Client = new S3Client(clientConfig);
// Test connection by checking if bucket exists
await this.testConnection();
this.connected = true;
if (this.config.environment.isDevelopment) {
console.log(`✅ [AppKit] R2 storage connected (account: ${this.accountId}, bucket: ${this.bucket})`);
if (this.cdnUrl) {
console.log(`🚀 [AppKit] R2 CDN enabled: ${this.cdnUrl}`);
}
}
}
catch (error) {
this.connected = false;
this.r2Client = null;
throw new Error(`R2 storage connection failed: ${error.message}`);
}
}
/**
* Tests R2 connection by checking bucket access
*/
async testConnection() {
const { HeadBucketCommand } = await import('@aws-sdk/client-s3');
try {
await this.r2Client.send(new HeadBucketCommand({ Bucket: this.bucket }));
}
catch (error) {
if (error.name === 'NotFound') {
throw new Error(`R2 bucket not found: ${this.bucket}`);
}
if (error.name === 'Forbidden') {
throw new Error(`R2 bucket access denied: ${this.bucket}. Check API token permissions.`);
}
throw error;
}
}
/**
* Stores file to R2 with automatic content type detection and zero egress cost
* @llm-rule WHEN: Uploading files to Cloudflare R2 for cost-effective storage
* @llm-rule AVOID: Manual R2 operations - this handles R2-specific optimizations
*/
async put(key, data, options) {
if (!this.connected || !this.r2Client) {
throw new Error('R2 storage not connected');
}
try {
const { PutObjectCommand } = await import('@aws-sdk/client-s3');
// Build R2 put parameters (S3-compatible)
const params = {
Bucket: this.bucket,
Key: key,
Body: data,
ContentType: options?.contentType || this.detectContentType(key, data),
};
// Add R2-optimized parameters
if (options?.cacheControl) {
params.CacheControl = options.cacheControl;
}
else {
// R2 default cache control for better CDN performance
params.CacheControl = 'public, max-age=31536000'; // 1 year for static assets
}
if (options?.expires) {
params.Expires = options.expires;
}
if (options?.metadata) {
params.Metadata = options.metadata;
}
// Execute upload to R2
await this.r2Client.send(new PutObjectCommand(params));
if (this.config.environment.isDevelopment) {
console.log(`☁️ [AppKit] R2 file uploaded: ${key} (${data.length} bytes, zero egress cost)`);
}
return key;
}
catch (error) {
throw new Error(`R2 upload failed: ${error.message}`);
}
}
/**
* Retrieves file from R2 with streaming support and zero egress cost
* @llm-rule WHEN: Downloading files from Cloudflare R2
* @llm-rule AVOID: Manual R2 operations - this handles streaming and cost optimization
*/
async get(key) {
if (!this.connected || !this.r2Client) {
throw new Error('R2 storage not connected');
}
try {
const { GetObjectCommand } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
Key: key,
};
const result = await this.r2Client.send(new GetObjectCommand(params));
if (!result.Body) {
throw new Error(`R2 object has no body: ${key}`);
}
// Convert stream to buffer
const buffer = await this.streamToBuffer(result.Body);
if (this.config.environment.isDevelopment) {
console.log(`☁️ [AppKit] R2 file downloaded: ${key} (${buffer.length} bytes, zero egress cost)`);
}
return buffer;
}
catch (error) {
if (error.name === 'NoSuchKey') {
throw new Error(`File not found: ${key}`);
}
throw new Error(`R2 download failed: ${error.message}`);
}
}
/**
* Deletes file from R2 with confirmation
* @llm-rule WHEN: Removing files from Cloudflare R2 storage
* @llm-rule AVOID: Silent failures - this confirms deletion success
*/
async delete(key) {
if (!this.connected || !this.r2Client) {
console.error('R2 storage not connected');
return false;
}
try {
const { DeleteObjectCommand } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
Key: key,
};
await this.r2Client.send(new DeleteObjectCommand(params));
if (this.config.environment.isDevelopment) {
console.log(`🗑️ [AppKit] R2 file deleted: ${key}`);
}
return true;
}
catch (error) {
console.error(`[AppKit] R2 delete error for "${key}":`, error.message);
return false;
}
}
/**
* Lists files with prefix filtering and R2-optimized pagination
* @llm-rule WHEN: Browsing R2 files or implementing file managers
* @llm-rule AVOID: Loading all objects - R2 has same limits as S3
*/
async list(prefix = '') {
if (!this.connected || !this.r2Client) {
throw new Error('R2 storage not connected');
}
try {
const { ListObjectsV2Command } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
MaxKeys: 1000, // R2 limit same as S3
};
if (prefix) {
params.Prefix = prefix;
}
const result = await this.r2Client.send(new ListObjectsV2Command(params));
const files = [];
if (result.Contents) {
for (const object of result.Contents) {
if (object.Key) {
files.push({
key: object.Key,
size: object.Size || 0,
lastModified: object.LastModified || new Date(),
etag: object.ETag?.replace(/"/g, ''), // Remove quotes from ETag
contentType: await this.getObjectContentType(object.Key),
});
}
}
}
if (this.config.environment.isDevelopment) {
console.log(`☁️ [AppKit] R2 files listed: ${prefix}* (${files.length} files)`);
}
return files;
}
catch (error) {
console.error(`[AppKit] R2 list error for prefix "${prefix}":`, error.message);
return [];
}
}
/**
* Gets CDN or public URL for R2 object with automatic CDN detection
* @llm-rule WHEN: Generating URLs for R2 file access with CDN optimization
* @llm-rule AVOID: Hardcoded URLs - this handles CDN and R2-specific URLs
*/
url(key) {
// Use custom CDN URL if configured (recommended for production)
if (this.cdnUrl) {
const baseUrl = this.cdnUrl.endsWith('/') ? this.cdnUrl : this.cdnUrl + '/';
const cleanKey = key.startsWith('/') ? key.slice(1) : key;
return baseUrl + cleanKey;
}
// Use R2 public URL (has rate limits, CDN recommended)
return `https://pub-${this.generatePublicHash()}.r2.dev/${key}`;
}
/**
* Generates R2 public URL hash (simplified for demo)
*/
generatePublicHash() {
// In production, this would be the actual R2 public URL hash
// For now, we'll use a placeholder that works with the R2 endpoint
return this.accountId.slice(0, 8);
}
/**
* Generates signed URL for temporary R2 object access
* @llm-rule WHEN: Creating temporary download/upload links for R2 objects
* @llm-rule AVOID: Public URLs for private files - use signed URLs with expiration
*/
async signedUrl(key, expiresIn = 3600) {
if (!this.connected || !this.r2Client) {
throw new Error('R2 storage not connected');
}
try {
const { GetObjectCommand } = await import('@aws-sdk/client-s3');
const { getSignedUrl } = await import('@aws-sdk/s3-request-presigner');
const command = new GetObjectCommand({
Bucket: this.bucket,
Key: key,
});
const signedUrl = await getSignedUrl(this.r2Client, command, {
expiresIn,
});
if (this.config.environment.isDevelopment) {
console.log(`🔐 [AppKit] R2 signed URL generated: ${key} (expires in ${expiresIn}s)`);
}
return signedUrl;
}
catch (error) {
throw new Error(`R2 signed URL generation failed: ${error.message}`);
}
}
/**
* Checks if R2 object exists without downloading
* @llm-rule WHEN: Validating R2 object existence efficiently
* @llm-rule AVOID: Downloading objects just to check existence
*/
async exists(key) {
if (!this.connected || !this.r2Client) {
return false;
}
try {
const { HeadObjectCommand } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
Key: key,
};
await this.r2Client.send(new HeadObjectCommand(params));
return true;
}
catch (error) {
if (error.name === 'NotFound' || error.name === 'NoSuchKey') {
return false;
}
console.error(`[AppKit] R2 exists check error for "${key}":`, error.message);
return false;
}
}
/**
* Copies R2 object efficiently using server-side copy (zero egress cost)
* @llm-rule WHEN: Duplicating R2 objects without bandwidth costs
* @llm-rule AVOID: Download and upload - R2 server-side copy has zero egress fees
*/
async copy(sourceKey, destKey) {
if (!this.connected || !this.r2Client) {
throw new Error('R2 storage not connected');
}
try {
const { CopyObjectCommand } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
Key: destKey,
CopySource: `${this.bucket}/${sourceKey}`,
};
await this.r2Client.send(new CopyObjectCommand(params));
if (this.config.environment.isDevelopment) {
console.log(`☁️ [AppKit] R2 file copied: ${sourceKey} → ${destKey} (zero egress cost)`);
}
return destKey;
}
catch (error) {
throw new Error(`R2 copy failed: ${error.message}`);
}
}
/**
* Disconnects R2 strategy gracefully
* @llm-rule WHEN: App shutdown or storage cleanup
* @llm-rule AVOID: Abrupt disconnection - graceful shutdown prevents connection issues
*/
async disconnect() {
if (!this.connected)
return;
try {
// R2 client doesn't need explicit disconnection (uses S3 SDK)
this.connected = false;
this.r2Client = null;
if (this.config.environment.isDevelopment) {
console.log(`👋 [AppKit] R2 storage strategy disconnected`);
}
}
catch (error) {
console.error(`[AppKit] R2 disconnect error:`, error.message);
}
}
// Private helper methods
/**
* Converts readable stream to buffer
*/
async streamToBuffer(stream) {
const chunks = [];
return new Promise((resolve, reject) => {
stream.on('data', (chunk) => chunks.push(chunk));
stream.on('error', reject);
stream.on('end', () => resolve(Buffer.concat(chunks)));
});
}
/**
* Detects content type from file extension and buffer
*/
detectContentType(key, buffer) {
// Get extension from key
const ext = key.split('.').pop()?.toLowerCase();
// Common MIME types optimized for web delivery
const mimeTypes = {
'jpg': 'image/jpeg',
'jpeg': 'image/jpeg',
'png': 'image/png',
'gif': 'image/gif',
'webp': 'image/webp',
'avif': 'image/avif', // Modern format support
'svg': 'image/svg+xml',
'pdf': 'application/pdf',
'txt': 'text/plain',
'json': 'application/json',
'csv': 'text/csv',
'zip': 'application/zip',
'mp4': 'video/mp4',
'webm': 'video/webm',
'mp3': 'audio/mpeg',
'wav': 'audio/wav',
'woff2': 'font/woff2',
'woff': 'font/woff',
'css': 'text/css',
'js': 'text/javascript',
};
if (ext && mimeTypes[ext]) {
return mimeTypes[ext];
}
// Buffer-based detection for common formats
const magic = buffer.subarray(0, 4);
if (magic[0] === 0xFF && magic[1] === 0xD8 && magic[2] === 0xFF) {
return 'image/jpeg';
}
if (magic[0] === 0x89 && magic[1] === 0x50 && magic[2] === 0x4E && magic[3] === 0x47) {
return 'image/png';
}
if (magic[0] === 0x47 && magic[1] === 0x49 && magic[2] === 0x46) {
return 'image/gif';
}
return 'application/octet-stream';
}
/**
* Gets content type for existing R2 object
*/
async getObjectContentType(key) {
try {
const { HeadObjectCommand } = await import('@aws-sdk/client-s3');
const params = {
Bucket: this.bucket,
Key: key,
};
const result = await this.r2Client.send(new HeadObjectCommand(params));
return result.ContentType;
}
catch (error) {
// If we can't get content type, return undefined
return undefined;
}
}
/**
* Gets R2 connection info for debugging
*/
getConnectionInfo() {
return {
connected: this.connected,
bucket: this.bucket,
accountId: this.accountId,
endpoint: this.endpoint,
cdnEnabled: !!this.cdnUrl,
zeroEgressFees: true, // R2's key advantage
};
}
/**
* Gets R2-specific cost optimization info
*/
getCostInfo() {
return {
egressFees: 'Zero egress fees',
storageClass: 'Hot storage with instant access',
cdnIntegration: !!this.cdnUrl,
recommendedFor: [
'High-bandwidth applications',
'Media streaming',
'Global CDN delivery',
'Cost-sensitive workloads'
],
};
}
}
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