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index.js
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import { posix } from 'path'
import { Readable, pipelinePromise } from 'streamx'
import Hyperdrive from 'hyperdrive'
import { makeRoutedFetch } from 'make-fetch'
import mime from 'mime/lite.js'
import parseRange from 'range-parser'
import { EventIterator } from 'event-iterator'
const DEFAULT_TIMEOUT = 5000
const SPECIAL_DOMAIN = 'localhost'
const SPECIAL_FOLDER = '$'
const EXTENSIONS_FOLDER_NAME = 'extensions'
const EXTENSION_EVENT = 'extension-message'
const VERSION_FOLDER_NAME = 'version'
const PEER_OPEN = 'peer-open'
const PEER_REMOVE = 'peer-remove'
const MIME_TEXT_PLAIN = 'text/plain; charset=utf-8'
const MIME_APPLICATION_JSON = 'application/json'
const MIME_TEXT_HTML = 'text/html; charset=utf-8'
const MIME_EVENT_STREAM = 'text/event-stream; charset=utf-8'
const HEADER_CONTENT_TYPE = 'Content-Type'
const HEADER_LAST_MODIFIED = 'Last-Modified'
const WRITABLE_METHODS = [
'PUT',
'DELETE'
]
const BASIC_METHODS = [
'HEAD',
'GET'
]
export const ERROR_KEY_NOT_CREATED = 'Must create key with POST before reading'
const INDEX_FILES = [
'index.html',
'index.md',
'index.gmi',
'index.gemini',
'README.md'
]
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}">./${file}</a></li>`).join('\n')}
</ul>
`
}
// Support gemini files
mime.define({
'text/gemini': ['gmi', 'gemini']
}, true)
export default async function makeHyperFetch ({
sdk,
writable = false,
extensionMessages = writable,
timeout = DEFAULT_TIMEOUT,
renderIndex = DEFAULT_RENDER_INDEX
}) {
const { fetch, router } = makeRoutedFetch()
// Map loaded drive hostnames to their keys
// TODO: Track LRU + cache clearing
const drives = new Map()
const extensions = new Map()
const cores = new Map()
if (extensionMessages) {
router.get(`hyper://*/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/`, listExtensions)
router.get(`hyper://*/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/*`, listenExtension)
router.post(`hyper://*/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/*`, broadcastExtension)
router.post(`hyper://*/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/*/*`, extensionToPeer)
}
if (writable) {
router.get(`hyper://${SPECIAL_DOMAIN}/`, getKey)
router.post(`hyper://${SPECIAL_DOMAIN}/`, createKey)
router.put(`hyper://*/${SPECIAL_FOLDER}/${VERSION_FOLDER_NAME}/**`, putFilesVersioned)
router.put('hyper://*/**', putFiles)
router.delete(`hyper://*/${SPECIAL_FOLDER}/${VERSION_FOLDER_NAME}/**`, deleteFilesVersioned)
router.delete('hyper://*/**', deleteFiles)
}
router.head(`hyper://*/${SPECIAL_FOLDER}/${VERSION_FOLDER_NAME}/**`, headFilesVersioned)
router.get(`hyper://*/${SPECIAL_FOLDER}/${VERSION_FOLDER_NAME}/**`, getFilesVersioned)
router.get('hyper://*/**', getFiles)
router.head('hyper://*/**', headFiles)
async function getCore (hostname) {
if (cores.has(hostname)) {
return cores.get(hostname)
}
const core = await sdk.get(hostname)
await core.ready()
cores.set(core.id, core)
cores.set(core.url, core)
return core
}
async function getDBCoreForName (name) {
const corestore = sdk.namespace(name)
const dbCore = corestore.get({ name: 'db' })
await dbCore.ready()
if (!dbCore.discovery) {
const discovery = sdk.join(dbCore.discoveryKey)
dbCore.discovery = discovery
dbCore.once('close', () => {
discovery.destroy()
})
await discovery.flushed()
}
return dbCore
}
async function getDrive (hostname) {
if (drives.has(hostname)) {
return drives.get(hostname)
}
const core = await getCore(hostname)
const corestore = sdk.namespace(core.id)
const drive = new Hyperdrive(corestore, core.key)
await drive.ready()
drives.set(drive.core.id, drive)
drives.set(hostname, drive)
return drive
}
async function getDriveFromKey (key, errorOnNew = false) {
if (drives.has(key)) {
return drives.get(key)
}
const core = await getDBCoreForName(key)
if (!core.length && errorOnNew) {
throw new Error(ERROR_KEY_NOT_CREATED)
}
const corestore = sdk.namespace(key)
const drive = new Hyperdrive(corestore)
await drive.ready()
drives.set(key, drive)
drives.set(drive.core.id, drive)
return drive
}
async function getExtension (core, name) {
const key = core.url + name
if (extensions.has(key)) {
return extensions.get(key)
}
const existing = core.extensions.get(name)
if (existing) {
extensions.set(key, existing)
return existing
}
const extension = core.registerExtension(name, {
encoding: 'utf8',
onmessage: (content, peer) => {
core.emit(EXTENSION_EVENT, name, content, peer)
}
})
extensions.set(key, extension)
return extension
}
async function getExtensionPeers (core, name) {
// List peers with this extension
const allPeers = core.peers
return allPeers.filter((peer) => {
return peer?.extensions?.has(name)
})
}
function listExtensionNames (core) {
return [...core.extensions.keys()]
}
async function listExtensions (request) {
const { hostname } = new URL(request.url)
const accept = request.headers.get('Accept') || ''
const core = await getCore(`hyper://${hostname}/`)
if (accept.includes('text/event-stream')) {
const events = new EventIterator(({ push }) => {
function onMessage (name, content, peer) {
const id = peer.remotePublicKey.toString('hex')
// TODO: Fancy verification on the `name`?
// Send each line of content separately on a `data` line
const data = content.split('\n').map((line) => `data:${line}\n`).join('')
push(`id:${id}\nevent:${name}\n${data}\n`)
}
function onPeerOpen (peer) {
const id = peer.remotePublicKey.toString('hex')
push(`id:${id}\nevent:${PEER_OPEN}\n\n`)
}
function onPeerRemove (peer) {
// Whatever, probably an uninitialized peer
if (!peer.remotePublicKey) return
const id = peer.remotePublicKey.toString('hex')
push(`id:${id}\nevent:${PEER_REMOVE}\n\n`)
}
core.on(EXTENSION_EVENT, onMessage)
core.on(PEER_OPEN, onPeerOpen)
core.on(PEER_REMOVE, onPeerRemove)
return () => {
core.removeListener(EXTENSION_EVENT, onMessage)
core.removeListener(PEER_OPEN, onPeerOpen)
core.removeListener(PEER_REMOVE, onPeerRemove)
}
})
return {
statusCode: 200,
headers: {
[HEADER_CONTENT_TYPE]: MIME_EVENT_STREAM
},
body: events
}
}
const extensions = listExtensionNames(core)
return {
status: 200,
headers: { [HEADER_CONTENT_TYPE]: MIME_APPLICATION_JSON },
body: JSON.stringify(extensions, null, '\t')
}
}
async function listenExtension (request) {
const { hostname, pathname: rawPathname } = new URL(request.url)
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const name = pathname.slice(`/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/`.length)
const core = await getCore(`hyper://${hostname}/`)
await getExtension(core, name)
const peers = await getExtensionPeers(core, name)
const finalPeers = formatPeers(peers)
const body = JSON.stringify(finalPeers, null, '\t')
return {
status: 200,
body,
headers: {
[HEADER_CONTENT_TYPE]: MIME_APPLICATION_JSON
}
}
}
async function broadcastExtension (request) {
const { hostname, pathname: rawPathname } = new URL(request.url)
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const name = pathname.slice(`/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/`.length)
const core = await getCore(`hyper://${hostname}/`)
const extension = await getExtension(core, name)
const data = await request.text()
extension.broadcast(data)
return { status: 200 }
}
async function extensionToPeer (request) {
const { hostname, pathname: rawPathname } = new URL(request.url)
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const subFolder = pathname.slice(`/${SPECIAL_FOLDER}/${EXTENSIONS_FOLDER_NAME}/`.length)
const [name, extensionPeer] = subFolder.split('/')
const core = await getCore(`hyper://${hostname}/`)
const extension = await getExtension(core, name)
const peers = await getExtensionPeers(core, name)
const peer = peers.find(({ remotePublicKey }) => remotePublicKey.toString('hex') === extensionPeer)
if (!peer) {
return {
status: 404,
headers: {
[HEADER_CONTENT_TYPE]: MIME_TEXT_PLAIN
},
body: 'Peer Not Found'
}
}
const data = await request.arrayBuffer()
extension.send(data, peer)
return { status: 200 }
}
async function getKey (request) {
const key = new URL(request.url).searchParams.get('key')
if (!key) {
return { status: 400, body: 'Must specify key parameter to resolve' }
}
try {
const drive = await getDriveFromKey(key, true)
return { body: drive.url }
} catch (e) {
if (e.message === ERROR_KEY_NOT_CREATED) {
return {
status: 400,
body: e.message,
headers: {
[HEADER_CONTENT_TYPE]: MIME_TEXT_PLAIN
}
}
} else throw e
}
}
async function createKey (request) {
// TODO: Allow importing secret keys here
// Maybe specify a seed to use for generating the blobs?
// Else we'd need to specify the blobs keys and metadata keys
const key = new URL(request.url).searchParams.get('key')
if (!key) {
return { status: 400, body: 'Must specify key parameter to resolve' }
}
const drive = await getDriveFromKey(key, false)
return { body: drive.url }
}
async function putFiles (request) {
const { hostname, pathname: rawPathname } = new URL(request.url)
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const contentType = request.headers.get('Content-Type') || ''
const isFormData = contentType.includes('multipart/form-data')
const drive = await getDrive(`hyper://${hostname}`)
if (!drive.db.feed.writable) {
return { status: 403, body: `Cannot PUT file to read-only drive: ${drive.url}`, headers: { Location: request.url } }
}
const mtime = Date.now()
if (isFormData) {
// It's a form! Get the files out and process them
const formData = await request.formData()
for (const [name, data] of formData) {
if (name !== 'file') continue
const filePath = posix.join(pathname, data.name)
await pipelinePromise(
Readable.from(data.stream()),
drive.createWriteStream(filePath, {
metadata: {
mtime
}
})
)
}
} else {
if (pathname.endsWith('/')) {
return { status: 405, body: 'Cannot PUT file with trailing slash', headers: { Location: request.url } }
} else {
await pipelinePromise(
Readable.from(request.body),
drive.createWriteStream(pathname, {
metadata: {
mtime
}
})
)
}
}
const fullURL = new URL(pathname, drive.url).href
const headers = {
Location: request.url,
ETag: `${drive.version}`,
Link: `<${fullURL}>; rel="canonical"`,
[HEADER_LAST_MODIFIED]: isFormData ? undefined : new Date(mtime).toUTCString()
}
return { status: 201, headers }
}
function putFilesVersioned (request) {
return {
status: 405,
body: 'Cannot PUT file to old version',
headers: { Location: request.url }
}
}
async function deleteFiles (request) {
const { hostname, pathname: rawPathname } = new URL(request.url)
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const drive = await getDrive(`hyper://${hostname}`)
if (!drive.db.feed.writable) {
return { status: 403, body: `Cannot DELETE file in read-only drive: ${drive.url}`, headers: { Location: request.url } }
}
if (pathname.endsWith('/')) {
let didDelete = false
for await (const entry of drive.list(pathname)) {
await drive.del(entry.key)
didDelete = true
}
if (!didDelete) {
return { status: 404, body: 'Not Found', headers: { [HEADER_CONTENT_TYPE]: MIME_TEXT_PLAIN } }
}
return { status: 200 }
}
const entry = await drive.entry(pathname)
if (!entry) {
return { status: 404, body: 'Not Found', headers: { [HEADER_CONTENT_TYPE]: MIME_TEXT_PLAIN } }
}
await drive.del(pathname)
const fullURL = new URL(pathname, drive.url).href
const headers = {
ETag: `${drive.version}`,
Link: `<${fullURL}>; rel="canonical"`
}
return { status: 200, headers }
}
function deleteFilesVersioned (request) {
return { status: 405, body: 'Cannot DELETE old version', headers: { Location: request.url } }
}
async function headFilesVersioned (request) {
const url = new URL(request.url)
const { hostname, pathname: rawPathname, searchParams } = url
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const accept = request.headers.get('Accept') || ''
const isRanged = request.headers.get('Range') || ''
const noResolve = searchParams.has('noResolve')
const parts = pathname.split('/')
const version = parts[3]
const realPath = ensureLeadingSlash(parts.slice(4).join('/'))
const drive = await getDrive(`hyper://${hostname}`)
const snapshot = await drive.checkout(version)
return serveHead(snapshot, realPath, { accept, isRanged, noResolve })
}
async function headFiles (request) {
const url = new URL(request.url)
const { hostname, pathname: rawPathname, searchParams } = url
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const accept = request.headers.get('Accept') || ''
const isRanged = request.headers.get('Range') || ''
const noResolve = searchParams.has('noResolve')
const drive = await getDrive(`hyper://${hostname}`)
return serveHead(drive, pathname, { accept, isRanged, noResolve })
}
async function serveHead (drive, pathname, { accept, isRanged, noResolve }) {
const isDirectory = pathname.endsWith('/')
const fullURL = new URL(pathname, drive.url).href
const isWritable = writable && drive.db.feed.writable
const Allow = isWritable ? BASIC_METHODS.concat(WRITABLE_METHODS) : BASIC_METHODS
const resHeaders = {
ETag: `${drive.version}`,
'Accept-Ranges': 'bytes',
Link: `<${fullURL}>; rel="canonical"`,
Allow
}
if (isDirectory) {
const entries = await listEntries(drive, pathname)
const hasItems = entries.length
if (!hasItems && pathname !== '/') {
return {
status: 404,
headers: {
[HEADER_CONTENT_TYPE]: MIME_TEXT_PLAIN
}
}
}
if (!noResolve) {
for (const indexFile of INDEX_FILES) {
if (entries.includes(indexFile)) {
const mimeType = getMimeType(indexFile)
return {
status: 204,
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: mimeType
}
}
}
}
}
// TODO: Add range header calculation
if (accept.includes('text/html')) {
return {
status: 204,
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: MIME_TEXT_HTML
}
}
}
return {
status: 204,
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: MIME_APPLICATION_JSON
}
}
}
const { entry, path } = await resolvePath(drive, pathname, noResolve)
if (!entry) {
return { status: 404, body: 'Not Found' }
}
resHeaders.ETag = `${entry.seq + 1}`
resHeaders['Content-Length'] = `${entry.value.blob.byteLength}`
const contentType = getMimeType(path)
resHeaders[HEADER_CONTENT_TYPE] = contentType
if (entry?.value?.metadata?.mtime) {
const date = new Date(entry.value.metadata.mtime)
resHeaders[HEADER_LAST_MODIFIED] = date.toUTCString()
}
const size = entry.value.byteLength
if (isRanged) {
const ranges = parseRange(size, isRanged)
if (ranges && ranges.length && ranges.type === 'bytes') {
const [{ start, end }] = ranges
const length = (end - start + 1)
return {
status: 200,
headers: {
...resHeaders,
'Content-Length': `${length}`,
'Content-Range': `bytes ${start}-${end}/${size}`
}
}
}
}
return {
status: 200,
headers: resHeaders
}
}
async function getFilesVersioned (request) {
const url = new URL(request.url)
const { hostname, pathname: rawPathname, searchParams } = url
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const accept = request.headers.get('Accept') || ''
const isRanged = request.headers.get('Range') || ''
const noResolve = searchParams.has('noResolve')
const parts = pathname.split('/')
const version = parts[3]
const realPath = ensureLeadingSlash(parts.slice(4).join('/'))
const drive = await getDrive(`hyper://${hostname}`)
const snapshot = await drive.checkout(version)
return serveGet(snapshot, realPath, { accept, isRanged, noResolve })
}
// TODO: Redirect on directories without trailing slash
async function getFiles (request) {
const url = new URL(request.url)
const { hostname, pathname: rawPathname, searchParams } = url
const pathname = decodeURI(ensureLeadingSlash(rawPathname))
const accept = request.headers.get('Accept') || ''
const isRanged = request.headers.get('Range') || ''
const noResolve = searchParams.has('noResolve')
const drive = await getDrive(`hyper://${hostname}`)
return serveGet(drive, pathname, { accept, isRanged, noResolve })
}
async function serveGet (drive, pathname, { accept, isRanged, noResolve }) {
const isDirectory = pathname.endsWith('/')
const fullURL = new URL(pathname, drive.url).href
if (isDirectory) {
const resHeaders = {
ETag: `${drive.version}`,
Link: `<${fullURL}>; rel="canonical"`
}
const entries = await listEntries(drive, pathname)
if (!entries.length && pathname !== '/') {
return {
status: 404,
body: '[]',
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: MIME_APPLICATION_JSON
}
}
}
if (!noResolve) {
for (const indexFile of INDEX_FILES) {
if (entries.includes(indexFile)) {
return serveFile(drive, posix.join(pathname, indexFile), isRanged)
}
}
}
if (accept.includes('text/html')) {
const body = await renderIndex(new URL(fullURL), entries, fetch)
return {
status: 200,
body,
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: MIME_TEXT_HTML
}
}
}
return {
status: 200,
body: JSON.stringify(entries, null, '\t'),
headers: {
...resHeaders,
[HEADER_CONTENT_TYPE]: MIME_APPLICATION_JSON
}
}
}
const { entry, path } = await resolvePath(drive, pathname, noResolve)
if (!entry) {
return { status: 404, body: 'Not Found' }
}
return serveFile(drive, path, isRanged)
}
return fetch
}
async function serveFile (drive, pathname, isRanged) {
const contentType = getMimeType(pathname)
const fullURL = new URL(pathname, drive.url).href
const entry = await drive.entry(pathname)
const resHeaders = {
ETag: `${entry.seq + 1}`,
[HEADER_CONTENT_TYPE]: contentType,
'Accept-Ranges': 'bytes',
Link: `<${fullURL}>; rel="canonical"`
}
if (entry?.value?.metadata?.mtime) {
const date = new Date(entry.value.metadata.mtime)
resHeaders[HEADER_LAST_MODIFIED] = date.toUTCString()
}
const size = entry.value.blob.byteLength
if (isRanged) {
const ranges = parseRange(size, isRanged)
if (ranges && ranges.length && ranges.type === 'bytes') {
const [{ start, end }] = ranges
const length = (end - start + 1)
return {
status: 200,
body: drive.createReadStream(pathname, {
start,
end
}),
headers: {
...resHeaders,
'Content-Length': `${length}`,
'Content-Range': `bytes ${start}-${end}/${size}`
}
}
}
}
return {
status: 200,
headers: {
...resHeaders,
'Content-Length': `${size}`
},
body: drive.createReadStream(pathname)
}
}
function makeToTry (pathname) {
return [
pathname,
pathname + '.html',
pathname + '.md'
]
}
async function resolvePath (drive, pathname, noResolve) {
if (noResolve) {
const entry = await drive.entry(pathname)
return { entry, path: pathname }
}
for (const path of makeToTry(pathname)) {
const entry = await drive.entry(path)
if (entry) {
return { entry, path }
}
}
return { entry: null, path: null }
}
async function listEntries (drive, pathname = '/') {
const entries = []
for await (const path of drive.readdir(pathname)) {
const fullPath = posix.join(pathname, path)
const stat = await drive.entry(fullPath)
if (stat === null) {
entries.push(path + '/')
} else {
entries.push(path)
}
}
return entries
}
function formatPeers (peers) {
return peers.map((peer) => {
const remotePublicKey = peer.remotePublicKey.toString('hex')
const remoteHost = peer.stream?.rawStream?.remoteHost
return {
remotePublicKey,
remoteHost
}
})
}
function getMimeType (path) {
let mimeType = mime.getType(path) || 'text/plain; charset=utf-8'
if (mimeType.startsWith('text/')) mimeType = `${mimeType}; charset=utf-8`
return mimeType
}
function ensureLeadingSlash (path) {
return path.startsWith('/') ? path : '/' + path
}