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index.js
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import { makeRoutedFetch } from 'make-fetch'
import { IPLDURLSystem } from 'js-ipld-url-resolve'
import parseRange from 'range-parser'
import mime from 'mime/lite.js'
import { exporter } from 'ipfs-unixfs-exporter'
import { CID } from 'multiformats/cid'
import { base32 } from 'multiformats/bases/base32'
import { base36 } from 'multiformats/bases/base36'
// Different from raw JSON. Determenistic
import * as dagJSON from '@ipld/dag-json'
import * as cbor from '@ipld/dag-cbor'
import crypto from 'crypto'
import { posix as posixPath } from 'path'
import { EventIterator } from 'event-iterator'
const bases = base32.decoder.or(base36.decoder)
const IPFS_TIMEOUT = 30000
const IPNS_TIMEOUT = 120000
const SPECIAL_HOSTNAME = 'localhost'
const EMPTY_DIR_IPFS_PATH = '/ipfs/bafyaabakaieac/'
const MIME_JSON = 'application/json'
const JSONCodec = {
decode (data) {
return JSON.parse(Buffer.from(data).toString('utf8'))
},
encode (data) {
return JSON.stringify(data)
}
}
const DEFAULT_HEADERS = {
'Content-Type': 'text/plain; charset=utf-8'
}
async function DEFAULT_ON_NOT_FOUND (request) {
return {
status: 405,
body: 'Method Not Supported'
}
}
async function DEFAULT_RENDER_INDEX (url, files, fetch) {
return `
<!DOCTYPE html>
<title>Index of ${url.pathname}</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<h1>Index of ${url.pathname}</h1>
<ul>
<li><a href="../">../</a></li>
${files.map((file) => `<li><a href="${file}">./${file}</a></li>`).join('\n')}
</ul>
`
}
export default function makeIPFSFetch ({
ipfs,
timeout = IPFS_TIMEOUT,
ipnsTimeout = IPNS_TIMEOUT,
onNotFound = DEFAULT_ON_NOT_FOUND,
renderIndex = DEFAULT_RENDER_INDEX,
defaultHeaders = DEFAULT_HEADERS,
writable = true
}) {
const { router, fetch } = makeRoutedFetch({
onNotFound
})
const ipldSystem = new IPLDURLSystem({
getNode,
saveNode
})
async function saveNode (data, { encoding = 'dag-cbor', ...opts } = {}) {
return ipfs.dag.put(data, {
storeCodec: encoding,
...opts
})
}
function detectIPLDCodec (request) {
const { headers } = request
const contentType = headers.get('Content-Type')
let codec = cbor
let storeCodec = 'dag-cbor'
if (contentType === MIME_JSON) {
codec = JSONCodec
storeCodec = 'dag-json'
} else if (contentType === 'application/dag-json') {
codec = dagJSON
storeCodec = 'dag-json'
} else if (contentType === 'application/vnd.ipld.dag-cbor') {
codec = cbor
storeCodec = 'dag-cbor'
} else {
return null
}
return { codec, storeCodec }
}
router.get('ipld://*/**', async ({ url, headers, signal }) => {
const accept = headers.get('Accept')
const format = new URL(url).searchParams.get('format')
const value = await ipldSystem.resolve(url)
if (format === 'dag-cbor' || accept === 'application/vnd.ipld.dag-cbor') {
return {
status: 200,
headers: {
'Content-Type': 'application/vnd.ipld.dag-cbor'
},
body: cbor.encode(value)
}
}
return {
status: 200,
headers: {
'Content-Type': MIME_JSON
},
body: dagJSON.encode(value)
}
})
if (writable) {
router.post(`ipld://${SPECIAL_HOSTNAME}/**`, async (request) => {
const { url, signal } = request
const format = new URL(url).searchParams.get('format')
const data = await request.arrayBuffer()
const decoderInfo = detectIPLDCodec(request)
if (!decoderInfo) {
return {
// TODO: better status?
status: 400,
headers: defaultHeaders,
body: 'Unsupproted content-type, must be dag-cbor, application/json, or dag-json'
}
}
const decoded = decoderInfo.codec.decode(data)
let { storeCodec } = decoderInfo
if (format) {
if (format === 'dag-json' || format === 'dag-cbor') {
storeCodec = format
} else {
return {
// TODO: better status?
status: 400,
headers: defaultHeaders,
body: `Unsupported format, must be dag-json or dag-cbor. Got ${format}`
}
}
}
const cid = await ipfs.dag.put(decoded, {
storeCodec,
timeout,
signal
})
const cidHash = cid.toV1().toString()
const addedURL = `ipld://${cidHash}/`
return {
status: 201,
headers: {
...defaultHeaders,
Location: addedURL
},
body: addedURL
}
})
router.patch('ipld://*/**', async (request) => {
const { url } = request
const data = await request.arrayBuffer()
const decoderInfo = detectIPLDCodec(request)
if (!decoderInfo) {
return {
// TODO: better status?
status: 400,
headers: defaultHeaders,
body: 'Unsupproted content-type, must be dag-cbor, application/json, or dag-json'
}
}
const patches = decoderInfo.codec.decode(data)
const updatedURL = await ipldSystem.patch(url, patches)
return {
status: 201,
headers: {
...defaultHeaders,
Location: updatedURL
},
body: updatedURL
}
})
}
if (writable) {
router.get('pubsub://*/', async ({ url, headers }) => {
const { searchParams, hostname } = new URL(url)
const format = searchParams.get('format')
const accept = headers.get('Accept')
const topic = hostname
if (accept && accept.includes('text/event-stream')) {
const events = new EventIterator(({ push, fail }) => {
function handler (event) {
const { from, data, sequenceNumber } = event
try {
const id = sequenceNumber.toString(16)
let formatted = null
if (format === 'json') {
formatted = JSON.parse(Buffer.from(data).toString('utf8'))
} else if (format === 'utf8') {
formatted = Buffer.from(data).toString('utf8')
} else {
formatted = Buffer.from(data).toString('base64')
}
const eventData = JSON.stringify({
from,
data: formatted
})
push(`id:${id}\ndata:${eventData}\n\n`)
} catch (e) {
push(`type:error\ndata:${e.stack}\n\n`)
}
}
ipfs.pubsub.subscribe(topic, handler).catch((e) => {
fail(e)
})
return () => ipfs.pubsub.unsubscribe(topic, handler)
})
return {
status: 200,
headers: {
'Content-Type': 'text/event-stream'
},
body: events
}
}
const id = await ipfs.id()
const subs = await ipfs.pubsub.ls()
const subscribed = subs.includes(topic)
const body = JSON.stringify({ id, topic, subscribed }, null, '\t')
return {
status: 200,
headers: {
'Content-Type': MIME_JSON
},
body
}
})
router.post('pubsub://*/', async (request) => {
const { url, signal } = request
const topic = new URL(url).hostname
const payload = await request.arrayBuffer()
// TODO: Handle oversized messages wihth 413
await ipfs.pubsub.publish(topic, payload, {
signal,
timeout
})
return {
status: 200
}
})
}
if (writable) {
router.get(`ipns://${SPECIAL_HOSTNAME}/`, async ({ url, signal }) => {
const key = new URL(url).searchParams.get('key')
const exists = await hasKey(key, signal)
if (!exists) {
return {
status: 404,
headers: defaultHeaders,
body: 'Key Not Found'
}
} else {
const keyURL = keyToURL(exists)
return {
status: 302,
headers: {
...defaultHeaders,
Location: keyURL
},
body: keyURL
}
}
})
// TODO: Generate from headers somehow
router.post(`ipns://${SPECIAL_HOSTNAME}/`, async ({ url, signal }) => {
const key = new URL(url).searchParams.get('key')
// Localhost is used for generating keys
const exists = await hasKey(key, signal)
if (!exists) {
await genKey(key, signal)
}
const keyData = await hasKey(key, signal)
const keyURL = keyToURL(keyData)
return {
status: 201,
headers: {
Location: keyURL
}
}
})
router.delete(`ipns://${SPECIAL_HOSTNAME}/`, async ({ url, signal }) => {
const key = new URL(url).searchParams.get('key')
await ipfs.key.rm(key, {
signal,
timeout
})
return {
status: 200
}
})
router.post(`ipfs://${SPECIAL_HOSTNAME}/`, async (request) => {
const { headers, signal } = request
const contentType = headers.get('Content-Type') || ''
const isFormData = contentType.includes('multipart/form-data')
const isCAR = contentType.includes('application/vnd.ipld.car')
if (isCAR) {
const results = []
const importOpts = { timeout, pinRoots: true }
for await (const { root } of ipfs.dag.import(request.body, importOpts)) {
const { cid } = root
const cidHash = cid.toString()
const addedURL = `ipfs://${cidHash}/`
results.push(addedURL)
}
return {
status: 200,
headers: defaultHeaders,
body: results.join('\n')
}
}
const dir = '/ipfs/bafyaabakaieac/localhost'
const addedURLRaw = await uploadData(dir, request, isFormData, signal)
// Resolve the localhost thing back to the root CID
const { cid } = await ipfs.dag.resolve(addedURLRaw.replace('ipfs://', '/ipfs/'))
const cidHash = cid.toString()
const addedURL = `ipfs://${cidHash}/`
return {
status: 201,
headers: {
...defaultHeaders,
Location: addedURL
},
body: addedURL
}
})
router.put(`ipfs://${SPECIAL_HOSTNAME}/`, onNotFound)
router.put('ipfs://*/**', async (request) => {
const { url, headers, signal } = request
const contentType = headers.get('Content-Type') || ''
const isFormData = contentType.includes('multipart/form-data')
const ipfsPath = urlToIPFSPath(url)
const addedURL = await uploadData(ipfsPath, request, isFormData, signal)
return {
status: 201,
headers: {
...defaultHeaders,
Location: addedURL
},
body: addedURL
}
})
router.put(`ipns://${SPECIAL_HOSTNAME}/`, onNotFound)
router.put('ipns://*/**', async (request) => {
const { url, signal, headers } = request
const contentType = headers.get('Content-Type') || ''
const isFormData = contentType.includes('multipart/form-data')
const ipnsPath = urlToIPFSPath(url)
const split = ipnsPath.split('/')
const keyName = split[2]
const subpath = split.slice(3).join('/')
if (!isFormData && !subpath) {
return {
status: 400,
body: 'Cannot upload to root. Must either use Form Data or a file subpath.'
}
}
// Resolve to current CID before writing over it
const ipfsPath = await resolveIPNS(ipnsPath)
const addedURL = await uploadData(ipfsPath, request, isFormData, signal)
// We just want the new root CID, not the full path to the file
const cid = addedURL.slice('ipfs://'.length).split('/')[0]
const value = `/ipfs/${cid}/`
return updateIPNS(keyName, value)
})
router.post('ipns://*/', async (request) => {
const { url, signal } = request
const { hostname: keyName } = new URL(url)
const rawValue = await request.text()
const value = rawValue.replace(/^ipfs:\/\//, '/ipfs/').replace(/^ipns:\/\//, '/ipns/')
return updateIPNS(keyName, value, signal)
})
router.delete('ipfs://*/**', async ({ url, signal }) => {
const ipfsPath = urlToIPFSPath(url)
return deleteData(ipfsPath, signal)
})
router.delete('ipns://*/**', async ({ url, signal }) => {
const { hostname: keyName } = new URL(url)
const ipnsPath = urlToIPNSPath(url)
const ipfsPath = await resolveIPNS(ipnsPath, signal)
const { body: updatedURL } = await deleteData(ipfsPath, signal)
const value = updatedURL.replace(/^ipfs:\/\//, '/ipfs/').replace(/^ipns:\/\//, '/ipns/')
return updateIPNS(keyName, value, signal)
})
}
// These are all reserved domains for later use
router.head(`ipfs://${SPECIAL_HOSTNAME}/**`, onNotFound)
router.get(`ipfs://${SPECIAL_HOSTNAME}/**`, onNotFound)
router.head(`ipns://${SPECIAL_HOSTNAME}/`, onNotFound)
router.get(`ipns://${SPECIAL_HOSTNAME}/`, onNotFound)
router.head('ipfs://*/**', async ({ url, signal }) => {
const { searchParams } = new URL(url)
const ipfsPath = urlToIPFSPath(url)
return serveHead(ipfsPath, searchParams, signal)
})
router.head('ipns://*/**', async ({ url, signal }) => {
const { searchParams } = new URL(url)
let ipfsPath = urlToIPNSPath(url)
ipfsPath = await resolveIPNS(ipfsPath, signal)
return serveHead(ipfsPath, searchParams, signal)
})
router.get('ipfs://*/**', async ({ url, signal, headers }) => {
const { searchParams } = new URL(url)
const ipfsPath = urlToIPFSPath(url)
return serveGet(url, ipfsPath, searchParams, headers, signal)
})
router.get('ipns://*/**', async ({ url, signal, headers }) => {
const { searchParams } = new URL(url)
let ipfsPath = urlToIPNSPath(url)
ipfsPath = await resolveIPNS(ipfsPath, signal)
return serveGet(url, ipfsPath, searchParams, headers, signal)
})
async function serveGet (url, ipfsPath, searchParams, reqHeaders, signal) {
const format = searchParams.get('format')
const accept = reqHeaders.get('Accept') || ''
const expectedType = format || accept
const headers = { ...defaultHeaders }
if (expectedType === 'raw' || expectedType === 'application/vnd.ipld.raw') {
const body = await ipfs.block.get(ipfsPath, {
timeout,
signal
})
headers['Content-Type'] = 'application/vnd.ipld.raw'
return {
status: 200,
headers,
body
}
}
if (expectedType === 'car' || expectedType === 'application/vnd.ipld.car') {
const { cid } = await ipfs.dag.resolve(ipfsPath, {
timeout,
signal
})
// must resolve to a CID to export, paths not supported here
const body = ipfs.dag.export(cid, {
timeout,
signal
})
headers['Content-Type'] = 'application/vnd.ipld.car'
return {
status: 200,
headers,
body
}
}
const stat = await getStat(ipfsPath)
if (stat.type === 'directory') {
// Probably a directory
let body = null
try {
const stats = await collect(ipfs.ls(ipfsPath, { signal, timeout }))
const files = stats.map(({ name, type }) => (type === 'dir') ? `${name}/` : name)
if (files.includes('index.html')) {
if (!searchParams.has('noResolve')) {
return serveFile(posixPath.join(ipfsPath, 'index.html'), searchParams, reqHeaders, headers, signal)
}
}
if (accept.includes('text/html')) {
const page = await renderIndex(url, files, fetch)
headers['Content-Type'] = 'text/html; charset=utf-8'
body = page
} else {
const json = JSON.stringify(files, null, '\t')
headers['Content-Type'] = `${MIME_JSON}; charset=utf-8`
body = json
}
return {
status: 200,
headers,
body
}
} catch {
return serveFile(ipfsPath, searchParams, reqHeaders, headers, signal)
}
} else {
return serveFile(ipfsPath, searchParams, reqHeaders, headers, signal)
}
}
async function serveHead (ipfsPath, searchParams, signal) {
const noResolve = searchParams.has('noResolve')
const stat = await getStat(ipfsPath)
if (stat.type === 'directory') {
// TODO: Something for directories?
if (!noResolve) {
const stats = await collect(ipfs.ls(ipfsPath, {
signal,
timeout
}))
const files = stats.map(({ name, type }) => (type === 'dir') ? `${name}/` : name)
if (files.includes('index.html')) {
ipfsPath = posixPath.join(ipfsPath, 'index.html')
} else {
return {
status: 200,
headers: defaultHeaders
}
}
}
}
const finalStat = await getStat(ipfsPath, signal)
const { size } = finalStat
const mimeName = searchParams.get('filename') || ipfsPath
return {
status: 200,
headers: {
...defaultHeaders,
'Accept-Ranges': 'bytes',
'Content-Type': getMimeType(mimeName),
'Content-Length': `${size}`
}
}
}
async function serveFile (path, searchParams, reqHeaders, headers = { ...defaultHeaders }, signal) {
headers['Accept-Ranges'] = 'bytes'
// Probably a file
const isRanged = reqHeaders.get('Range') || ''
const file = await getStat(path)
const { size } = file
const mimeName = searchParams.get('filename') || path
headers['Content-Type'] = getMimeType(mimeName)
if (isRanged) {
const ranges = parseRange(size, isRanged)
if (ranges && ranges.length && ranges.type === 'bytes') {
const [{ start, end }] = ranges
const length = (end - start + 1)
headers['Content-Length'] = `${length}`
headers['Content-Range'] = `bytes ${start}-${end}/${size}`
return {
status: 206,
headers,
body: ipfs.cat(path, { signal, offset: start, length, timeout })
}
} else {
headers['Content-Length'] = `${size}`
return {
status: 200,
headers,
body: ipfs.cat(path, { signal, timeout })
}
}
} else {
headers['Content-Length'] = `${size}`
return {
status: 200,
headers,
body: ipfs.cat(path, { signal, timeout })
}
}
}
async function getStat (path, signal) {
return exporter(path, ipfs.block, { signal, preload: false, timeout })
}
async function resolveIPNS (path, signal) {
const segments = ensureStartingSlash(path).split(/\/+/)
let mainSegment = segments[2]
if (!mainSegment.includes('.')) {
const keys = await ipfs.key.list({ signal, timeout: ipnsTimeout })
const keyForName = keys.find(({ name }) => name === mainSegment)
if (keyForName) {
mainSegment = keyForName.id + '/'
}
}
const toResolve = `/ipns${ensureEndingSlash(ensureStartingSlash(mainSegment))}`
const resolved = await ipfs.resolve(toResolve, { signal, timeout: ipnsTimeout })
return [resolved, ...segments.slice(3)].join('/')
}
async function updateIPNS (keyName, value, signal) {
const existing = await hasKey(keyName)
if (!existing) {
throw new Error(`Invalid IPNS key: ${keyName}`)
}
const finalName = existing ? existing.name : keyName
const publish = await ipfs.name.publish(value, {
allowOffline: true,
key: finalName,
signal,
timeout: ipnsTimeout
})
const { name: cid } = publish
const ipnsURL = `ipns://${cid}/`
return {
status: 201,
headers: {
...defaultHeaders,
Location: ipnsURL
},
body: ipnsURL
}
}
async function genKey (keyName, signal) {
await ipfs.key.gen(keyName, {
signal,
type: 'rsa',
size: 2048,
timeout: ipnsTimeout
})
await updateIPNS(keyName, EMPTY_DIR_IPFS_PATH, signal)
}
async function hasKey (keyName, signal) {
const keys = await ipfs.key.list({
signal,
timeout: ipnsTimeout
})
return keys.find(({ name, id }) => {
if (name === keyName) return true
try {
return (CID.parse(id, bases).toV1().toString(base36) === keyName)
} catch {
return false
}
})
}
async function deleteData (ipfsPath, signal) {
const tmpDir = makeTmpDir()
const { rootCID, relativePath } = cidFromPath(ipfsPath)
if (rootCID) {
await ipfs.files.cp(rootCID, tmpDir, {
parents: true,
cidVersion: 1,
signal,
timeout
})
}
await ipfs.files.rm(posixPath.join(tmpDir, relativePath), {
recursive: true,
cidVersion: 1,
signal,
timeout
})
const { cid } = await ipfs.files.stat(tmpDir, {
hash: true,
signal,
timeout
})
const cidHash = cid.toString()
const addedURL = `ipfs://${cidHash}/`
return {
statusCode: 200,
headers: {
...defaultHeaders,
Location: addedURL
},
body: addedURL
}
}
async function uploadData (ipfsPath, response, isFormData, signal) {
const tmpDir = makeTmpDir()
const { rootCID, relativePath } = cidFromPath(ipfsPath)
if (rootCID) {
await ipfs.files.cp(rootCID, tmpDir, {
parents: true,
cidVersion: 1,
signal,
timeout
})
}
if (isFormData) {
const formData = await response.formData()
const toWait = []
for (const [fieldName, fileData] of formData) {
// TODO: Should we filter by field name?
if (fieldName !== 'file') continue
// Must not be a file
if (!fileData.name) continue
const fileName = fileData.name
const finalPath = posixPath.join(tmpDir, relativePath, fileName)
const result = ipfs.files.write(finalPath, fileData, {
cidVersion: 1,
parents: true,
truncate: true,
create: true,
rawLeaves: true,
signal,
timeout
})
toWait.push(result)
}
await Promise.all(toWait)
} else {
const path = posixPath.join(tmpDir, ensureStartingSlash(stripEndingSlash(relativePath)))
await ipfs.files.write(path, await response.blob(), {
signal,
parents: true,
truncate: true,
create: true,
rawLeaves: true,
cidVersion: 1,
timeout
})
}
const { cid } = await ipfs.files.stat(tmpDir, { hash: true, signal, timeout })
const cidHash = cid.toString()
const endPath = isFormData ? relativePath : stripEndingSlash(relativePath)
const addedURL = `ipfs://${cidHash}${ensureStartingSlash(endPath)}`
return addedURL
}
async function getNode (cid) {
const { value } = await ipfs.dag.get(cid, {
timeout
})
return value
}
return fetch
}
async function collect (iterable) {
const result = []
for await (const item of iterable) {
result.push(item)
}
return result
}
function ensureStartingSlash (path) {
if (!path.startsWith('/')) return '/' + path
return path
}
function ensureEndingSlash (path) {
if (!path.endsWith('/')) return path + '/'
return path
}
function stripEndingSlash (path) {
if (path.endsWith('/')) return path.slice(0, -1)
return path
}
function getMimeType (path) {
let mimeType = mime.getType(path) || 'text/plain'
if (mimeType.startsWith('text/')) mimeType = `${mimeType}; charset=utf-8`
return mimeType
}
function makeTmpDir () {
const random = crypto.randomBytes(8).toString('hex')
return `/ipfs-fetch-dirs/${random}`
}
function cidFromPath (path) {
const components = path.split('/')
if (path.startsWith('/ipfs/')) components.shift()
if (path.startsWith('/')) components.shift()
try {
const cidComponent = components[0]
const relativePath = components.slice(1).join('/')
const rootCID = CID.parse(cidComponent, bases)
return {
rootCID,
relativePath
}
} catch (e) {
return {
rootCID: null,
relativePath: path
}
}
}
function keyToURL ({ id }) {
const hostname = CID.parse(id, bases).toV1().toString(base36)
return `ipns://${hostname}/`
}
function urlToIPFSPath (url) {
const { pathname, hostname } = new URL(url)
return `/ipfs/${hostname}${pathname}`
}
function urlToIPNSPath (url) {
const { pathname, hostname } = new URL(url)
return `/ipns/${hostname}${pathname}`
}