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If falsey, this will use the * blockstack.js's [[getNameInfo]] function instead. * @return {Promise<string>} that resolves to the public read URL of the file * or rejects with an error */ export async function getUserAppFileUrl( path: string, username: string, appOrigin: string, zoneFileLookupURL?: string ): Promise<string|null> { const profile = await lookupProfile(username, zoneFileLookupURL) let bucketUrl: string = null if (profile.hasOwnProperty('apps')) { if (profile.apps.hasOwnProperty(appOrigin)) { const url = profile.apps[appOrigin] const bucket = url.replace(/\/?(\?|#|$)/, '/$1') bucketUrl = `${bucket}${path}` } } return bucketUrl } /** * * * @deprecated * #### v19 Use [[UserSession.encryptContent]]. * * Encrypts the data provided with the app public key. * @param {String|Buffer} content - data to encrypt * @param {Object} [options=null] - options object * @param {String} options.publicKey - the hex string of the ECDSA public * key to use for encryption. If not provided, will use user's appPublicKey. * @return {String} Stringified ciphertext object */ export function encryptContent( content: string | Buffer, options?: { publicKey?: string }, caller?: UserSession ) { const opts = Object.assign({}, options) if (!opts.publicKey) { const privateKey = (caller || new UserSession()).loadUserData().appPrivateKey opts.publicKey = getPublicKeyFromPrivate(privateKey) } const cipherObject = encryptECIES(opts.publicKey, content) return JSON.stringify(cipherObject) } /** * * @deprecated * #### v19 Use [[UserSession.decryptContent]]. * * Decrypts data encrypted with `encryptContent` with the * transit private key. * @param {String|Buffer} content - encrypted content. * @param {Object} [options=null] - options object * @param {String} options.privateKey - the hex string of the ECDSA private * key to use for decryption. If not provided, will use user's appPrivateKey. * @return {String|Buffer} decrypted content. */ export function decryptContent( content: string, options?: { privateKey?: string }, caller?: UserSession ) { const opts = Object.assign({}, options) if (!opts.privateKey) { opts.privateKey = (caller || new UserSession()).loadUserData().appPrivateKey } try { const cipherObject = JSON.parse(content) return decryptECIES(opts.privateKey, cipherObject) } catch (err) { if (err instanceof SyntaxError) { throw new Error('Failed to parse encrypted content JSON. The content may not ' + 'be encrypted. If using getFile, try passing { decrypt: false }.') } else { throw err } } } /* Get the gaia address used for servicing multiplayer reads for the given * (username, app) pair. * @private * @ignore */ async function getGaiaAddress( app: string, username?: string, zoneFileLookupURL?: string, caller?: UserSession ): Promise<string> { const opts = normalizeOptions({ app, username }, caller) let fileUrl: string if (username) { fileUrl = await getUserAppFileUrl('/', opts.username, opts.app, zoneFileLookupURL) } else { if (!caller) { caller = new UserSession() } const gaiaHubConfig = await caller.getOrSetLocalGaiaHubConnection() fileUrl = await getFullReadUrl('/', gaiaHubConfig) } const matches = fileUrl.match(/([13][a-km-zA-HJ-NP-Z0-9]{26,35})/) if (!matches) { throw new Error('Failed to parse gaia address') } return matches[matches.length - 1] } /** * @param {Object} [options=null] - options object * @param {String} options.username - the Blockstack ID to lookup for multi-player storage * @param {String} options.app - the app to lookup for multi-player storage - * defaults to current origin * * @ignore */ function normalizeOptions<T>( options?: { app?: string, username?: string } & T, caller?: UserSession ) { const opts = Object.assign({}, options) if (opts.username) { if (!opts.app) { const appConfig = (caller || new UserSession()).appConfig if (!appConfig) { throw new InvalidStateError('Missing AppConfig') } opts.app = appConfig.appDomain } } return opts } /** * @deprecated * #### v19 Use [[UserSession.getFileUrl]] instead. * * @param {String} path - the path to the file to read * @returns {Promise<string>} that resolves to the URL or rejects with an error */ export async function getFileUrl( path: string, options?: GetFileUrlOptions, caller?: UserSession ): Promise<string> { const opts = normalizeOptions(options, caller) let readUrl: string if (opts.username) { readUrl = await getUserAppFileUrl(path, opts.username, opts.app, opts.zoneFileLookupURL) } else { const gaiaHubConfig = await (caller || new UserSession()).getOrSetLocalGaiaHubConnection() readUrl = await getFullReadUrl(path, gaiaHubConfig) } if (!readUrl) { throw new Error('Missing readURL') } else { return readUrl } } /* Handle fetching the contents from a given path. Handles both * multi-player reads and reads from own storage. * @private * @ignore */ function getFileContents(path: string, app: string, username: string | undefined, zoneFileLookupURL: string | undefined, forceText: boolean, caller?: UserSession): Promise<string | ArrayBuffer | null> { return Promise.resolve() .then(() => { const opts = { app, username, zoneFileLookupURL } return getFileUrl(path, opts, caller) }) .then(readUrl => fetch(readUrl)) .then<string | ArrayBuffer | null>((response) => { if (response.status !== 200) { if (response.status === 404) { Logger.debug(`getFile ${path} returned 404, returning null`) return null } else { throw new Error(`getFile ${path} failed with HTTP status ${response.status}`) } } const contentType = response.headers.get('Content-Type') if (forceText || contentType === null || contentType.startsWith('text') || contentType === 'application/json') { return response.text() } else { return response.arrayBuffer() } }) } /* Handle fetching an unencrypted file, its associated signature * and then validate it. Handles both multi-player reads and reads * from own storage. * @private * @ignore */ function getFileSignedUnencrypted(path: string, opt: GetFileOptions, caller?: UserSession) { // future optimization note: // in the case of _multi-player_ reads, this does a lot of excess // profile lookups to figure out where to read files // do browsers cache all these requests if Content-Cache is set? return Promise.all( [getFileContents(path, opt.app, opt.username, opt.zoneFileLookupURL, false, caller), getFileContents(`${path}${SIGNATURE_FILE_SUFFIX}`, opt.app, opt.username, opt.zoneFileLookupURL, true, caller), getGaiaAddress(opt.app, opt.username, opt.zoneFileLookupURL, caller)] ) .then(([fileContents, signatureContents, gaiaAddress]) => { if (!fileContents) { return fileContents } if (!gaiaAddress) { throw new SignatureVerificationError('Failed to get gaia address for verification of: ' + `${path}`) } if (!signatureContents || typeof signatureContents !== 'string') { throw new SignatureVerificationError('Failed to obtain signature for file: ' + `${path} -- looked in ${path}${SIGNATURE_FILE_SUFFIX}`) } let signature let publicKey try { const sigObject = JSON.parse(signatureContents) signature = sigObject.signature publicKey = sigObject.publicKey } catch (err) { if (err instanceof SyntaxError) { throw new Error('Failed to parse signature content JSON ' + `(path: ${path}${SIGNATURE_FILE_SUFFIX})` + ' The content may be corrupted.') } else { throw err } } const signerAddress = publicKeyToAddress(publicKey) if (gaiaAddress !== signerAddress) { throw new SignatureVerificationError(`Signer pubkey address (${signerAddress}) doesn't` + ` match gaia address (${gaiaAddress})`) } else if (!verifyECDSA(fileContents, publicKey, signature)) { throw new SignatureVerificationError( 'Contents do not match ECDSA signature: ' + `path: ${path}, signature: ${path}${SIGNATURE_FILE_SUFFIX}` ) } else { return fileContents } }) } /* Handle signature verification and decryption for contents which are * expected to be signed and encrypted. This works for single and * multiplayer reads. In the case of multiplayer reads, it uses the * gaia address for verification of the claimed public key. * @private * @ignore */ function handleSignedEncryptedContents(caller: UserSession, path: string, storedContents: string, app: string, username?: string, zoneFileLookupURL?: string) { const appPrivateKey = caller.loadUserData().appPrivateKey const appPublicKey = getPublicKeyFromPrivate(appPrivateKey) let addressPromise: Promise<string> if (username) { addressPromise = getGaiaAddress(app, username, zoneFileLookupURL, caller) } else { const address = publicKeyToAddress(appPublicKey) addressPromise = Promise.resolve(address) } return addressPromise.then((address) => { if (!address) { throw new SignatureVerificationError('Failed to get gaia address for verification of: ' + `${path}`) } let sigObject try { sigObject = JSON.parse(storedContents) } catch (err) { if (err instanceof SyntaxError) { throw new Error('Failed to parse encrypted, signed content JSON. The content may not ' + 'be encrypted. If using getFile, try passing' + ' { verify: false, decrypt: false }.') } else { throw err } } const signature = sigObject.signature const signerPublicKey = sigObject.publicKey const cipherText = sigObject.cipherText const signerAddress = publicKeyToAddress(signerPublicKey) if (!signerPublicKey || !cipherText || !signature) { throw new SignatureVerificationError( 'Failed to get signature verification data from file:' + ` ${path}` ) } else if (signerAddress !== address) { throw new SignatureVerificationError(`Signer pubkey address (${signerAddress}) doesn't` + ` match gaia address (${address})`) } else if (!verifyECDSA(cipherText, signerPublicKey, signature)) { throw new SignatureVerificationError('Contents do not match ECDSA signature in file:' + ` ${path}`) } else { return caller.decryptContent(cipherText) } }) } export interface GetFileUrlOptions { /** * The Blockstack ID to lookup for multi-player storage. * If not specified, the currently signed in username is used. */ username?: string; /** * The app to lookup for multi-player storage - defaults to current origin. * @default `window.location.origin` * Only if available in the executing environment, otherwise `undefined`. */ app?: string; /** * The URL to use for zonefile lookup. If falsey, this will use * the blockstack.js's [[getNameInfo]] function instead. */ zoneFileLookupURL?: string; } /** * Used to pass options to [[UserSession.getFile]] */ export interface GetFileOptions extends GetFileUrlOptions { /** * Try to decrypt the data with the app private key. * @default true */ decrypt?: boolean; /** * Whether the content should be verified, only to be used * when [[UserSession.putFile]] was set to `sign = true`. * @default false */ verify?: boolean; } /** * Retrieves the specified file from the app's data store. * @param {String} path - the path to the file to read * @returns {Promise} that resolves to the raw data in the file * or rejects with an error */ export function getFile( path: string, options?: GetFileOptions, caller?: UserSession ) { const defaults: GetFileOptions = { decrypt: true, verify: false, username: null, app: typeof window !== 'undefined' ? window.location.origin : undefined, zoneFileLookupURL: null } const opt = Object.assign({}, defaults, options) if (!caller) { caller = new UserSession() } // in the case of signature verification, but no // encryption expected, need to fetch _two_ files. if (opt.verify && !opt.decrypt) { return getFileSignedUnencrypted(path, opt, caller) } return getFileContents(path, opt.app, opt.username, opt.zoneFileLookupURL, !!opt.decrypt, caller) .then<string|ArrayBuffer|Buffer>((storedContents) => { if (storedContents === null) { return storedContents } else if (opt.decrypt && !opt.verify) { if (typeof storedContents !== 'string') { throw new Error('Expected to get back a string for the cipherText') } return caller.decryptContent(storedContents) } else if (opt.decrypt && opt.verify) { if (typeof storedContents !== 'string') { throw new Error('Expected to get back a string for the cipherText') } return handleSignedEncryptedContents(caller, path, storedContents, opt.app, opt.username, opt.zoneFileLookupURL) } else if (!opt.verify && !opt.decrypt) { return storedContents } else { throw new Error('Should be unreachable.') } }) } /** * Stores the data provided in the app's data store to to the file specified. * @param {String} path - the path to store the data in * @param {String|Buffer} content - the data to store in the file * @return {Promise} that resolves if the operation succeed and rejects * if it failed */ export async function putFile( path: string, content: string | Buffer, options?: PutFileOptions, caller?: UserSession, ): Promise<string> { const defaults: PutFileOptions = { encrypt: true, sign: false, contentType: '' } const opt = Object.assign({}, defaults, options) let { contentType } = opt if (!contentType) { contentType = (typeof (content) === 'string') ? 'text/plain; charset=utf-8' : 'application/octet-stream' } if (!caller) { caller = new UserSession() } // First, let's figure out if we need to get public/private keys, // or if they were passed in let privateKey = '' let publicKey = '' if (opt.sign) { if (typeof (opt.sign) === 'string') { privateKey = opt.sign } else { privateKey = caller.loadUserData().appPrivateKey } } if (opt.encrypt) { if (typeof (opt.encrypt) === 'string') { publicKey = opt.encrypt } else { if (!privateKey) { privateKey = caller.loadUserData().appPrivateKey } publicKey = getPublicKeyFromPrivate(privateKey) } } // In the case of signing, but *not* encrypting, // we perform two uploads. So the control-flow // here will return there. if (!opt.encrypt && opt.sign) { const signatureObject = signECDSA(privateKey, content) const signatureContent = JSON.stringify(signatureObject) const gaiaHubConfig = await caller.getOrSetLocalGaiaHubConnection() try { const fileUrls = await Promise.all([ uploadToGaiaHub(path, content, gaiaHubConfig, contentType), uploadToGaiaHub(`${path}${SIGNATURE_FILE_SUFFIX}`, signatureContent, gaiaHubConfig, 'application/json') ]) return fileUrls[0] } catch (error) { const freshHubConfig = await caller.setLocalGaiaHubConnection() const fileUrls = await Promise.all([ uploadToGaiaHub(path, content, freshHubConfig, contentType), uploadToGaiaHub(`${path}${SIGNATURE_FILE_SUFFIX}`, signatureContent, freshHubConfig, 'application/json') ]) return fileUrls[0] } } // In all other cases, we only need one upload. if (opt.encrypt && !opt.sign) { content = encryptContent(content, { publicKey }) contentType = 'application/json' } else if (opt.encrypt && opt.sign) { const cipherText = encryptContent(content, { publicKey }) const signatureObject = signECDSA(privateKey, cipherText) const signedCipherObject = { signature: signatureObject.signature, publicKey: signatureObject.publicKey, cipherText } content = JSON.stringify(signedCipherObject) contentType = 'application/json' } const gaiaHubConfig = await caller.getOrSetLocalGaiaHubConnection() try { return await uploadToGaiaHub(path, content, gaiaHubConfig, contentType) } catch (error) { const freshHubConfig = await caller.setLocalGaiaHubConnection() const file = await uploadToGaiaHub(path, content, freshHubConfig, contentType) return file } } /** * Deletes the specified file from the app's data store. * @param path - The path to the file to delete. * @param options - Optional options object. * @param options.wasSigned - Set to true if the file was originally signed * in order for the corresponding signature file to also be deleted. * @returns Resolves when the file has been removed or rejects with an error. */ export async function deleteFile( path: string, options?: { wasSigned?: boolean; }, caller?: UserSession ) { if (!caller) { caller = new UserSession() } const gaiaHubConfig = await caller.getOrSetLocalGaiaHubConnection() const opts = Object.assign({}, options) if (opts.wasSigned) { // If signed, delete both the content file and the .sig file try { await deleteFromGaiaHub(path, gaiaHubConfig) await deleteFromGaiaHub(`${path}${SIGNATURE_FILE_SUFFIX}`, gaiaHubConfig) } catch (error) { const freshHubConfig = await caller.setLocalGaiaHubConnection() await deleteFromGaiaHub(path, freshHubConfig) await deleteFromGaiaHub(`${path}${SIGNATURE_FILE_SUFFIX}`, gaiaHubConfig) } } else { try { await deleteFromGaiaHub(path, gaiaHubConfig) } catch (error) { const freshHubConfig = await caller.setLocalGaiaHubConnection() await deleteFromGaiaHub(path, freshHubConfig) } } } /** * Get the app storage bucket URL * @param {String} gaiaHubUrl - the gaia hub URL * @param {String} appPrivateKey - the app private key used to generate the app address * @returns {Promise} That resolves to the URL of the app index file * or rejects if it fails */ export function getAppBucketUrl(gaiaHubUrl: string, appPrivateKey: string) { return getBucketUrl(gaiaHubUrl, appPrivateKey) } /** * Loop over the list of files in a Gaia hub, and run a callback on each entry. * Not meant to be called by external clients. * @param {GaiaHubConfig} hubConfig - the Gaia hub config * @param {String | null} page - the page ID * @param {number} callCount - the loop count * @param {number} fileCount - the number of files listed so far * @param {function} callback - the callback to invoke on each file. If it returns a falsey * value, then the loop stops. If it returns a truthy value, the loop continues. * @returns {Promise} that resolves to the number of files listed. * @private * @ignore */ async function listFilesLoop( caller: UserSession, hubConfig: GaiaHubConfig | null, page: string | null, callCount: number, fileCount: number, callback: (name: string) => boolean ): Promise<number> { if (callCount > 65536) { // this is ridiculously huge, and probably indicates // a faulty Gaia hub anyway (e.g. on that serves endless data) throw new Error('Too many entries to list') } hubConfig = hubConfig || await caller.getOrSetLocalGaiaHubConnection() let response: Response try { const pageRequest = JSON.stringify({ page }) const fetchOptions = { method: 'POST', headers: { 'Content-Type': 'application/json', 'Content-Length': `${pageRequest.length}`, Authorization: `bearer ${hubConfig.token}` }, body: pageRequest } response = await fetch(`${hubConfig.server}/list-files/${hubConfig.address}`, fetchOptions) if (!response.ok) { throw new Error(`listFiles failed with HTTP status ${response.status}`) } } catch (error) { // If error occurs on the first call, perform a gaia re-connection and retry. // Same logic as other gaia requests (putFile, getFile, etc). if (callCount === 0) { const freshHubConfig = await caller.setLocalGaiaHubConnection() return listFilesLoop(caller, freshHubConfig, page, callCount + 1, 0, callback) } throw error } const responseText = await response.text() const responseJSON = JSON.parse(responseText) const entries = responseJSON.entries const nextPage = responseJSON.page if (entries === null || entries === undefined) { // indicates a misbehaving Gaia hub or a misbehaving driver // (i.e. the data is malformed) throw new Error('Bad listFiles response: no entries') } for (let i = 0; i < entries.length; i++) { const rc = callback(entries[i]) if (!rc) { // callback indicates that we're done return fileCount + i } } if (nextPage && entries.length > 0) { // keep going -- have more entries return listFilesLoop( caller, hubConfig, nextPage, callCount + 1, fileCount + entries.length, callback ) } else { // no more entries -- end of data return fileCount + entries.length } } /** * List the set of files in this application's Gaia storage bucket. * @param {function} callback - a callback to invoke on each named file that * returns `true` to continue the listing operation or `false` to end it * @return {Promise} that resolves to the number of files listed */ export function listFiles( callback: (name: string) => boolean, caller?: UserSession ): Promise<number> { caller = caller || new UserSession() return listFilesLoop(caller, null, null, 0, 0, callback) } export { connectToGaiaHub, uploadToGaiaHub, BLOCKSTACK_GAIA_HUB_LABEL } |