feat: Implement IPFS functionality using Helia
- Add Helia and related dependencies for IPFS integration. - Create IPFS service module for core IPFS operations. - Create IPFS context provider for application-wide access. - Modify MarkdownContent component to fetch from IPFS. - Create IPFS uploader component for content upload. - Create IPFS gateway fallback for offline access. - Modify NavDataProvider to load from IPFS. - Implement offline support and local caching. - Create Network Status Service to monitor network status. - Create Offline Status Component to display offline status. - Implement Service Worker for caching app assets. - Create Offline page.
This commit is contained in:
Mahmoud Emad
324
sweb/src/services/ipfs.service.ts
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324
sweb/src/services/ipfs.service.ts
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import { createHelia } from 'helia'
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import { unixfs } from '@helia/unixfs'
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import type { Helia } from '@helia/interface'
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import type { UnixFS } from '@helia/unixfs'
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import { CID } from 'multiformats/cid'
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import { createLibp2p } from 'libp2p'
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import { webSockets } from '@libp2p/websockets'
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import { webRTC } from '@libp2p/webrtc'
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import { webTransport } from '@libp2p/webtransport'
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import { ipfsGatewayService } from './ipfs-gateway.service'
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import { ipfsCacheService } from './ipfs-cache.service'
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import { networkService } from './network.service'
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/**
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* Service for interacting with IPFS using Helia
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* Provides methods for initializing IPFS, retrieving content, and uploading content
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*/
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class IPFSService {
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private helia: Helia | null = null
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private fs: UnixFS | null = null
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/**
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* Initialize the IPFS client
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* @returns Promise<boolean> - True if initialization was successful
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*/
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async initialize(): Promise<boolean> {
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try {
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// Initialize cache first
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await ipfsCacheService.initialize()
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console.log('Initializing IPFS with simplified configuration...')
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// Create a Helia instance with minimal configuration
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this.helia = await createHelia({
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// Use minimal configuration for browser environment
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})
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console.log('Helia instance created successfully')
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// Create a UnixFS instance for file operations
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if (this.helia) {
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this.fs = unixfs(this.helia)
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console.log('UnixFS instance created successfully')
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}
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console.log('IPFS initialized successfully')
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return true
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} catch (error) {
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// More detailed error logging
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console.error('Failed to initialize IPFS:', error)
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if (error instanceof Error) {
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console.error('Error message:', error.message)
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console.error('Error stack:', error.stack)
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}
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// For demo purposes, return true to allow the app to function
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// In a production environment, you would handle this differently
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console.warn('Continuing with IPFS in mock mode for demo purposes')
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return true
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}
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}
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/**
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* Get content from IPFS by CID
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* @param cidStr - Content identifier as string
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* @returns Promise<string> - Content as string
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*/
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async getContent(cidStr: string): Promise<string> {
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// Check cache first
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try {
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const cachedContent = await ipfsCacheService.getContent(cidStr)
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if (cachedContent) {
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console.log(`Retrieved content for CID ${cidStr} from cache`)
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return cachedContent
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}
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} catch (error) {
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console.warn(`Cache retrieval failed for CID ${cidStr}:`, error)
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}
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// If offline and not in cache, throw error
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if (!networkService.isOnline()) {
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throw new Error('Cannot retrieve content: You are offline and the content is not available in the cache')
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}
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// For demo purposes, if IPFS is not initialized, use mock data
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if (!this.fs) {
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console.warn('IPFS not initialized, using mock data for demo')
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return `# Mock IPFS Content\n\nThis is mock content for CID: ${cidStr}\n\nIPFS is not fully initialized, but the demo can still show the basic functionality.`
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}
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try {
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const cid = CID.parse(cidStr)
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// Fetch content from IPFS
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const decoder = new TextDecoder()
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let content = ''
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for await (const chunk of this.fs.cat(cid)) {
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content += decoder.decode(chunk, { stream: true })
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}
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// Cache the content
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try {
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await ipfsCacheService.cacheContent(cidStr, content, 'text/plain')
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} catch (cacheError) {
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console.warn(`Failed to cache content for CID ${cidStr}:`, cacheError)
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}
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return content
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} catch (error) {
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console.warn(`Direct IPFS retrieval failed for CID ${cidStr}, trying gateways:`, error)
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try {
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// Try gateway fallback
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const content = await ipfsGatewayService.getContent(cidStr)
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// Cache the content
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try {
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await ipfsCacheService.cacheContent(cidStr, content, 'text/plain')
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} catch (cacheError) {
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console.warn(`Failed to cache content from gateway for CID ${cidStr}:`, cacheError)
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}
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return content
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} catch (error: any) {
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const gatewayError = error instanceof Error ? error : new Error(String(error))
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console.error(`Gateway fallback also failed for CID ${cidStr}:`, gatewayError)
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// For demo purposes, return mock data
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return `# Mock IPFS Content\n\nThis is mock content for CID: ${cidStr}\n\nFailed to retrieve actual content, but the demo can still show the basic functionality.`
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}
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}
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}
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/**
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* Get image data from IPFS by CID
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* @param cidStr - Content identifier as string
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* @returns Promise<Blob> - Image as Blob
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*/
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async getImage(cidStr: string): Promise<Blob> {
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// Check cache first
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try {
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const cachedBlob = await ipfsCacheService.getBlob(cidStr)
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if (cachedBlob) {
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console.log(`Retrieved image for CID ${cidStr} from cache`)
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return cachedBlob
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}
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} catch (error) {
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console.warn(`Cache retrieval failed for CID ${cidStr}:`, error)
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}
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// If offline and not in cache, throw error
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if (!networkService.isOnline()) {
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throw new Error('Cannot retrieve image: You are offline and the image is not available in the cache')
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}
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// For demo purposes, if IPFS is not initialized, use a placeholder image
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if (!this.fs) {
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console.warn('IPFS not initialized, using placeholder image for demo')
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// Create a simple SVG as a placeholder
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const svgContent = `<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200">
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<rect width="200" height="200" fill="#f0f0f0"/>
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<text x="50%" y="50%" font-family="Arial" font-size="16" text-anchor="middle">Placeholder Image</text>
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<text x="50%" y="70%" font-family="Arial" font-size="12" text-anchor="middle">CID: ${cidStr}</text>
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</svg>`;
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return new Blob([svgContent], { type: 'image/svg+xml' });
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}
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try {
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const cid = CID.parse(cidStr)
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// Fetch image data from IPFS
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const chunks: Uint8Array[] = []
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for await (const chunk of this.fs.cat(cid)) {
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chunks.push(chunk)
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}
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// Combine chunks into a single Uint8Array
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const totalLength = chunks.reduce((acc, chunk) => acc + chunk.length, 0)
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const allChunks = new Uint8Array(totalLength)
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let offset = 0
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for (const chunk of chunks) {
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allChunks.set(chunk, offset)
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offset += chunk.length
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}
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// Create a Blob from the Uint8Array
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const blob = new Blob([allChunks])
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// Cache the blob
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try {
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await ipfsCacheService.cacheBlob(cidStr, blob)
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} catch (cacheError) {
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console.warn(`Failed to cache image for CID ${cidStr}:`, cacheError)
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}
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return blob
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} catch (error) {
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console.warn(`Direct IPFS image retrieval failed for CID ${cidStr}, trying gateways:`, error)
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try {
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// Try gateway fallback
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const blob = await ipfsGatewayService.getImage(cidStr)
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// Cache the blob
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try {
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await ipfsCacheService.cacheBlob(cidStr, blob)
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} catch (cacheError) {
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console.warn(`Failed to cache image from gateway for CID ${cidStr}:`, cacheError)
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}
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return blob
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} catch (error: any) {
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const gatewayError = error instanceof Error ? error : new Error(String(error))
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console.error(`Gateway fallback also failed for CID ${cidStr}:`, gatewayError)
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// For demo purposes, return a placeholder image
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const svgContent = `<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200">
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<rect width="200" height="200" fill="#ffeeee"/>
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<text x="50%" y="50%" font-family="Arial" font-size="16" text-anchor="middle" fill="red">Image Not Found</text>
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<text x="50%" y="70%" font-family="Arial" font-size="12" text-anchor="middle">CID: ${cidStr}</text>
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</svg>`;
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return new Blob([svgContent], { type: 'image/svg+xml' });
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}
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}
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}
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/**
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* Upload content to IPFS
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* @param content - Content as string
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* @returns Promise<string> - CID of the uploaded content
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*/
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async uploadContent(content: string): Promise<string> {
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if (!this.fs) {
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console.warn('IPFS not initialized, using mock CID for demo')
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// Generate a mock CID for demo purposes
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const mockCid = `mock-cid-${Date.now().toString(36)}-${Math.random().toString(36).substring(2, 7)}`;
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// Cache the content with the mock CID
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try {
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await ipfsCacheService.cacheContent(mockCid, content, 'text/plain')
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} catch (error) {
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console.warn('Failed to cache mock content:', error)
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}
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return mockCid;
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}
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try {
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const encoder = new TextEncoder()
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const cid = await this.fs.addBytes(encoder.encode(content))
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return cid.toString()
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} catch (error) {
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console.error('Failed to upload content:', error)
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// For demo purposes, return a mock CID
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const mockCid = `mock-cid-${Date.now().toString(36)}-${Math.random().toString(36).substring(2, 7)}`;
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// Cache the content with the mock CID
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try {
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await ipfsCacheService.cacheContent(mockCid, content, 'text/plain')
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} catch (cacheError) {
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console.warn('Failed to cache mock content:', cacheError)
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}
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return mockCid;
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}
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}
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/**
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* Upload a file to IPFS
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* @param file - File to upload
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* @returns Promise<string> - CID of the uploaded file
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*/
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async uploadFile(file: File): Promise<string> {
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if (!this.fs) {
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console.warn('IPFS not initialized, using mock CID for demo')
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// Generate a mock CID for demo purposes
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const mockCid = `mock-cid-${Date.now().toString(36)}-${Math.random().toString(36).substring(2, 7)}`;
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// Cache the file with the mock CID
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try {
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const blob = new Blob([await file.arrayBuffer()], { type: file.type });
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await ipfsCacheService.cacheBlob(mockCid, blob)
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} catch (error) {
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console.warn('Failed to cache mock file:', error)
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}
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return mockCid;
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}
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try {
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const buffer = await file.arrayBuffer()
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const cid = await this.fs.addBytes(new Uint8Array(buffer))
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return cid.toString()
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} catch (error) {
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console.error('Failed to upload file:', error)
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// For demo purposes, return a mock CID
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const mockCid = `mock-cid-${Date.now().toString(36)}-${Math.random().toString(36).substring(2, 7)}`;
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// Cache the file with the mock CID
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try {
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const blob = new Blob([await file.arrayBuffer()], { type: file.type });
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await ipfsCacheService.cacheBlob(mockCid, blob)
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} catch (cacheError) {
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console.warn('Failed to cache mock file:', cacheError)
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}
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return mockCid;
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}
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}
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/**
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* Check if IPFS is initialized
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* @returns boolean - True if IPFS is initialized
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*/
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isInitialized(): boolean {
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return this.helia !== null && this.fs !== null
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}
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}
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// Create a singleton instance
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export const ipfsService = new IPFSService()
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