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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | import localforage from 'localforage'
import FileSystem from './fs'
import * as cidLog from './common/cid-log'
import * as debug from './common/debug'
import * as dataRoot from './data-root'
import * as ucan from './ucan/internal'
import { Maybe, authenticatedUsername } from './common'
import { Permissions } from './ucan/permissions'
import { Ucan } from './ucan'
/**
* Load a user's file system.
*
* @param permissions The permissions from initialise.
* Pass `null` if working without permissions
* @param username Optional, username of the user to load the file system from.
* Will try to load the file system of the authenticated user
* by default. Throws an error if there's no authenticated user.
* @param rootKey Optional, AES key to be the root key of a new filesystem.
* Will be used if a filesystem hasn't been created yet.
*/
export async function loadFileSystem(
permissions: Maybe<Permissions>,
username?: string,
rootKey?: string
): Promise<FileSystem> {
let cid, fs
// Look for username
username = username || (await authenticatedUsername() || undefined)
if (!username) throw new Error("User hasn't authenticated yet")
// Ensure internal UCAN dictionary
await ucan.store([])
// Determine the correct CID of the file system to load
const dataCid = navigator.onLine ? await dataRoot.lookup(username) : null
const [ logIdx, logLength ] = dataCid ? await cidLog.index(dataCid) : [ -1, 0 ]
if (!navigator.onLine) {
// Offline, use local CID
cid = await cidLog.newest()
} else if (!dataCid) {
// No DNS CID yet
cid = await cidLog.newest()
if (cid) debug.log("📓 No DNSLink, using local CID:", cid)
else debug.log("📓 Creating a new file system")
} else if (logIdx === 0) {
// DNS is up to date
cid = dataCid
debug.log("📓 DNSLink is up to date:", cid)
} else if (logIdx > 0) {
// DNS is outdated
cid = await cidLog.newest()
const idxLog = logIdx === 1 ? "1 newer local entry" : logIdx + " newer local entries"
debug.log("📓 DNSLink is outdated (" + idxLog + "), using local CID:", cid)
} else {
// DNS is newer
cid = dataCid
await cidLog.add(cid)
debug.log("📓 DNSLink is newer:", cid)
}
// If a file system exists, load it and return it
const p = permissions || undefined
fs = cid ? await FileSystem.fromCID(cid, { permissions: p }) : null
if (fs) return fs
// Otherwise make a new one
if (!rootKey) throw new Error("Can't make new filesystem without a root AES key")
fs = await FileSystem.empty({ permissions: p, rootKey })
await addSampleData(fs)
// Fin
return fs
}
// ㊙️
async function addSampleData(fs: FileSystem): Promise<void> {
await fs.mkdir("private/Apps")
await fs.mkdir("private/Audio")
await fs.mkdir("private/Documents")
await fs.mkdir("private/Photos")
await fs.mkdir("private/Video")
await fs.publish()
}
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