Merge pull request #4020 from MetaMask/i3941-jsdoc-bitpshr

Documentation

11 files changed, 295 insertions, 79 deletions

diff --git a/app/scripts/config.js b/app/scripts/config.js
index a8470ed82..e6f70ca2b 100644
--- a/app/scripts/config.js
+++ b/app/scripts/config.js
@@ -15,7 +15,41 @@ const BETA_UI_NETWORK_TYPE = 'networkBeta'
 
 global.METAMASK_DEBUG = process.env.METAMASK_DEBUG
 
-module.exports = {
+/**
+ * @typedef {Object} UrlConfig
+ * @property {string} localhost URL of local RPC provider
+ * @property {string} mainnet URL of mainnet RPC provider
+ * @property {string} ropsten URL of Ropsten testnet RPC provider
+ * @property {string} kovan URL of Kovan testnet RPC provider
+ * @property {string} rinkeby URL of Rinkeby testnet RPC provider
+ */
+
+/**
+ * @typedef {Object} NameConfig
+ * @property {string} 3 URL of local RPC provider
+ * @property {string} 4 URL of mainnet RPC provider
+ * @property {string} 42 URL of Ropsten testnet RPC provider
+ */
+
+/**
+ * @typedef {Object} EnumConfig
+ * @property {string} DEFAULT_RPC Default network provider URL
+ * @property {string} OLD_UI_NETWORK_TYPE Network associated with old UI
+ * @property {string} BETA_UI_NETWORK_TYPE Network associated with new UI
+ */
+
+/**
+ * @typedef {Object} Config
+ * @property {UrlConfig} network Network configuration parameters
+ * @property {UrlConfig} networkBeta Beta UI network configuration parameters
+ * @property {NameConfig} networkNames Network name configuration parameters
+ * @property {EnumConfig} enums Application-wide string constants
+ */
+
+/**
+ * @type {Config}
+ **/
+const config = {
   network: {
     localhost: LOCALHOST_RPC_URL,
     mainnet: MAINET_RPC_URL,
@@ -23,7 +57,6 @@ module.exports = {
     kovan: KOVAN_RPC_URL,
     rinkeby: RINKEBY_RPC_URL,
   },
-  // Used for beta UI
   networkBeta: {
     localhost: LOCALHOST_RPC_URL,
     mainnet: MAINET_RPC_URL_BETA,
@@ -42,3 +75,5 @@ module.exports = {
     BETA_UI_NETWORK_TYPE,
   },
 }
+
+module.exports = config
diff --git a/app/scripts/contentscript.js b/app/scripts/contentscript.js
index fe1766273..dbf1c6d4c 100644
--- a/app/scripts/contentscript.js
+++ b/app/scripts/contentscript.js
@@ -23,6 +23,9 @@ if (shouldInjectWeb3()) {
   setupStreams()
 }
 
+/**
+ * Creates a script tag that injects inpage.js
+ */
 function setupInjection () {
   try {
     // inject in-page script
@@ -37,6 +40,10 @@ function setupInjection () {
   }
 }
 
+/**
+ * Sets up two-way communication streams between the
+ * browser extension and local per-page browser context
+ */
 function setupStreams () {
   // setup communication to page and plugin
   const pageStream = new LocalMessageDuplexStream({
@@ -89,17 +96,34 @@ function setupStreams () {
   mux.ignoreStream('publicConfig')
 }
 
+
+/**
+ * Error handler for page to plugin stream disconnections
+ *
+ * @param {string} remoteLabel Remote stream name
+ * @param {Error} err Stream connection error
+ */
 function logStreamDisconnectWarning (remoteLabel, err) {
   let warningMsg = `MetamaskContentscript - lost connection to ${remoteLabel}`
   if (err) warningMsg += '\n' + err.stack
   console.warn(warningMsg)
 }
 
+/**
+ * Determines if Web3 should be injected
+ *
+ * @returns {boolean} {@code true} if Web3 should be injected
+ */
 function shouldInjectWeb3 () {
   return doctypeCheck() && suffixCheck()
     && documentElementCheck() && !blacklistedDomainCheck()
 }
 
+/**
+ * Checks the doctype of the current document if it exists
+ *
+ * @returns {boolean} {@code true} if the doctype is html or if none exists
+ */
 function doctypeCheck () {
   const doctype = window.document.doctype
   if (doctype) {
@@ -109,6 +133,11 @@ function doctypeCheck () {
   }
 }
 
+/**
+ * Checks the current document extension
+ *
+ * @returns {boolean} {@code true} if the current extension is not prohibited
+ */
 function suffixCheck () {
   var prohibitedTypes = ['xml', 'pdf']
   var currentUrl = window.location.href
@@ -122,6 +151,11 @@ function suffixCheck () {
   return true
 }
 
+/**
+ * Checks the documentElement of the current document
+ *
+ * @returns {boolean} {@code true} if the documentElement is an html node or if none exists
+ */
 function documentElementCheck () {
   var documentElement = document.documentElement.nodeName
   if (documentElement) {
@@ -130,6 +164,11 @@ function documentElementCheck () {
   return true
 }
 
+/**
+ * Checks if the current domain is blacklisted
+ * 
+ * @returns {boolean} {@code true} if the current domain is blacklisted
+ */
 function blacklistedDomainCheck () {
   var blacklistedDomains = [
     'uscourts.gov',
@@ -148,6 +187,9 @@ function blacklistedDomainCheck () {
   return false
 }
 
+/**
+ * Redirects the current page to a phishing information page
+ */
 function redirectToPhishingWarning () {
   console.log('MetaMask - redirecting to phishing warning')
   window.location.href = 'https://metamask.io/phishing.html'
diff --git a/app/scripts/controllers/computed-balances.js b/app/scripts/controllers/computed-balances.js
index 907b087cf..1a6802f9a 100644
--- a/app/scripts/controllers/computed-balances.js
+++ b/app/scripts/controllers/computed-balances.js
@@ -2,8 +2,24 @@ const ObservableStore = require('obs-store')
 const extend = require('xtend')
 const BalanceController = require('./balance')
 
-class ComputedbalancesController {
+/**
+ * @typedef {Object} ComputedBalancesOptions
+ * @property {Object} accountTracker Account tracker store reference
+ * @property {Object} txController Token controller reference
+ * @property {Object} blockTracker Block tracker reference
+ * @property {Object} initState Initial state to populate this internal store with
+ */
 
+/**
+ * Background controller responsible for syncing
+ * and computing ETH balances for all accounts
+ */
+class ComputedbalancesController {
+  /**
+   * Creates a new controller instance
+   *
+   * @param {ComputedBalancesOptions} [opts] Controller configuration parameters 
+   */
   constructor (opts = {}) {
     const { accountTracker, txController, blockTracker } = opts
     this.accountTracker = accountTracker
@@ -19,6 +35,9 @@ class ComputedbalancesController {
     this._initBalanceUpdating()
   }
 
+  /**
+   * Updates balances associated with each internal address
+   */
   updateAllBalances () {
     Object.keys(this.balances).forEach((balance) => {
       const address = balance.address
@@ -26,12 +45,23 @@ class ComputedbalancesController {
     })
   }
 
+  /**
+   * Initializes internal address tracking
+   *
+   * @private
+   */
   _initBalanceUpdating () {
     const store = this.accountTracker.store.getState()
     this.syncAllAccountsFromStore(store)
     this.accountTracker.store.subscribe(this.syncAllAccountsFromStore.bind(this))
   }
 
+  /**
+   * Uses current account state to sync and track all
+   * addresses associated with the current account
+   *
+   * @param {{ accounts: Object }} store Account tracking state
+   */
   syncAllAccountsFromStore (store) {
     const upstream = Object.keys(store.accounts)
     const balances = Object.keys(this.balances)
@@ -50,6 +80,13 @@ class ComputedbalancesController {
     })
   }
 
+  /**
+   * Conditionally establishes a new subscription
+   * to track an address associated with the current
+   * account
+   *
+   * @param {string} address Address to conditionally subscribe to
+   */
   trackAddressIfNotAlready (address) {
     const state = this.store.getState()
     if (!(address in state.computedBalances)) {
@@ -57,6 +94,12 @@ class ComputedbalancesController {
     }
   }
 
+  /**
+   * Establishes a new subscription to track an
+   * address associated with the current account
+   *
+   * @param {string} address Address to conditionally subscribe to
+   */
   trackAddress (address) {
     const updater = new BalanceController({
       address,
diff --git a/app/scripts/controllers/token-rates.js b/app/scripts/controllers/token-rates.js
index 22e3e8154..28409ea10 100644
--- a/app/scripts/controllers/token-rates.js
+++ b/app/scripts/controllers/token-rates.js
@@ -46,7 +46,7 @@ class TokenRatesController {
   }
 
   /**
-   * @type {Number} - Interval used to poll for exchange rates
+   * @type {Number}
    */
   set interval (interval) {
     this._handle && clearInterval(this._handle)
@@ -55,7 +55,7 @@ class TokenRatesController {
   }
 
   /**
-   * @type {Object} - Preferences controller instance
+   * @type {Object}
    */
   set preferences (preferences) {
     this._preferences && this._preferences.unsubscribe()
@@ -66,7 +66,7 @@ class TokenRatesController {
   }
 
   /**
-   * @type {Array} - Array of token objects with contract addresses
+   * @type {Array}
    */
   set tokens (tokens) {
     this._tokens = tokens
diff --git a/app/scripts/edge-encryptor.js b/app/scripts/edge-encryptor.js
index 24c0c93a8..dcb06873b 100644
--- a/app/scripts/edge-encryptor.js
+++ b/app/scripts/edge-encryptor.js
@@ -1,69 +1,97 @@
 const asmcrypto = require('asmcrypto.js')
 const Unibabel = require('browserify-unibabel')
 
+/**
+ * A Microsoft Edge-specific encryption class that exposes
+ * the interface expected by eth-keykeyring-controller
+ */
 class EdgeEncryptor {
+  /**
+   * Encrypts an arbitrary object to ciphertext
+   *
+   * @param {string} password Used to generate a key to encrypt the data
+   * @param {Object} dataObject Data to encrypt
+   * @returns {Promise<string>} Promise resolving to an object with ciphertext
+   */
+  encrypt (password, dataObject) {
+      var salt = this._generateSalt()
+      return this._keyFromPassword(password, salt)
+          .then(function (key) {
+              var data = JSON.stringify(dataObject)
+              var dataBuffer = Unibabel.utf8ToBuffer(data)
+              var vector = global.crypto.getRandomValues(new Uint8Array(16))
+              var resultbuffer = asmcrypto.AES_GCM.encrypt(dataBuffer, key, vector)
 
-    encrypt (password, dataObject) {
+              var buffer = new Uint8Array(resultbuffer)
+              var vectorStr = Unibabel.bufferToBase64(vector)
+              var vaultStr = Unibabel.bufferToBase64(buffer)
+              return JSON.stringify({
+                  data: vaultStr,
+                  iv: vectorStr,
+                  salt: salt,
+              })
+          })
+  }
 
-        var salt = this._generateSalt()
-        return this._keyFromPassword(password, salt)
-            .then(function (key) {
+  /**
+   * Decrypts an arbitrary object from ciphertext
+   *
+   * @param {string} password Used to generate a key to decrypt the data
+   * @param {string} text Ciphertext of an encrypted object
+   * @returns {Promise<Object>} Promise resolving to copy of decrypted object
+   */
+  decrypt (password, text) {
+      const payload = JSON.parse(text)
+      const salt = payload.salt
+      return this._keyFromPassword(password, salt)
+          .then(function (key) {
+              const encryptedData = Unibabel.base64ToBuffer(payload.data)
+              const vector = Unibabel.base64ToBuffer(payload.iv)
+              return new Promise((resolve, reject) => {
+                  var result
+                  try {
+                      result = asmcrypto.AES_GCM.decrypt(encryptedData, key, vector)
+                  } catch (err) {
+                      return reject(new Error('Incorrect password'))
+                  }
+                  const decryptedData = new Uint8Array(result)
+                  const decryptedStr = Unibabel.bufferToUtf8(decryptedData)
+                  const decryptedObj = JSON.parse(decryptedStr)
+                  resolve(decryptedObj)
+              })
+          })
+  }
 
-                var data = JSON.stringify(dataObject)
-                var dataBuffer = Unibabel.utf8ToBuffer(data)
-                var vector = global.crypto.getRandomValues(new Uint8Array(16))
-                var resultbuffer = asmcrypto.AES_GCM.encrypt(dataBuffer, key, vector)
+  /**
+   * Retrieves a cryptographic key using a password
+   *
+   * @private
+   * @param {string} password Password used to unlock a cryptographic key
+   * @param {string} salt Random base64 data
+   * @returns {Promise<Object>} Promise resolving to a derived key
+   */
+  _keyFromPassword (password, salt) {
 
-                var buffer = new Uint8Array(resultbuffer)
-                var vectorStr = Unibabel.bufferToBase64(vector)
-                var vaultStr = Unibabel.bufferToBase64(buffer)
-                return JSON.stringify({
-                    data: vaultStr,
-                    iv: vectorStr,
-                    salt: salt,
-                })
-            })
-    }
+      var passBuffer = Unibabel.utf8ToBuffer(password)
+      var saltBuffer = Unibabel.base64ToBuffer(salt)
+      return new Promise((resolve) => {
+          var key = asmcrypto.PBKDF2_HMAC_SHA256.bytes(passBuffer, saltBuffer, 10000)
+          resolve(key)
+      })
+  }
 
-    decrypt (password, text) {
-
-        const payload = JSON.parse(text)
-        const salt = payload.salt
-        return this._keyFromPassword(password, salt)
-            .then(function (key) {
-                const encryptedData = Unibabel.base64ToBuffer(payload.data)
-                const vector = Unibabel.base64ToBuffer(payload.iv)
-                return new Promise((resolve, reject) => {
-                    var result
-                    try {
-                        result = asmcrypto.AES_GCM.decrypt(encryptedData, key, vector)
-                    } catch (err) {
-                        return reject(new Error('Incorrect password'))
-                    }
-                    const decryptedData = new Uint8Array(result)
-                    const decryptedStr = Unibabel.bufferToUtf8(decryptedData)
-                    const decryptedObj = JSON.parse(decryptedStr)
-                    resolve(decryptedObj)
-                })
-            })
-    }
-
-    _keyFromPassword (password, salt) {
-
-        var passBuffer = Unibabel.utf8ToBuffer(password)
-        var saltBuffer = Unibabel.base64ToBuffer(salt)
-        return new Promise((resolve) => {
-            var key = asmcrypto.PBKDF2_HMAC_SHA256.bytes(passBuffer, saltBuffer, 10000)
-            resolve(key)
-        })
-    }
-
-    _generateSalt (byteCount = 32) {
-        var view = new Uint8Array(byteCount)
-        global.crypto.getRandomValues(view)
-        var b64encoded = btoa(String.fromCharCode.apply(null, view))
-        return b64encoded
-    }
+  /**
+   * Generates random base64 encoded data
+   *
+   * @private
+   * @returns {string} Randomized base64 encoded data
+   */
+  _generateSalt (byteCount = 32) {
+      var view = new Uint8Array(byteCount)
+      global.crypto.getRandomValues(view)
+      var b64encoded = btoa(String.fromCharCode.apply(null, view))
+      return b64encoded
+  }
 }
 
 module.exports = EdgeEncryptor
diff --git a/app/scripts/first-time-state.js b/app/scripts/first-time-state.js
index 3063df627..144534f43 100644
--- a/app/scripts/first-time-state.js
+++ b/app/scripts/first-time-state.js
@@ -2,10 +2,16 @@
 const env = process.env.METAMASK_ENV
 const METAMASK_DEBUG = process.env.METAMASK_DEBUG
 
-//
-// The default state of MetaMask
-//
-module.exports = {
+/**
+ * @typedef {Object} FirstTimeState
+ * @property {Object} config Initial configuration parameters
+ * @property {Object} NetworkController Network controller state
+ */
+
+/**
+ * @type {FirstTimeState}
+ */
+const initialState = {
   config: {},
   NetworkController: {
     provider: {
@@ -13,3 +19,5 @@ module.exports = {
     },
   },
 }
+
+module.exports = initialState
diff --git a/app/scripts/inpage.js b/app/scripts/inpage.js
index 92c732813..6d16eebd4 100644
--- a/app/scripts/inpage.js
+++ b/app/scripts/inpage.js
@@ -42,20 +42,20 @@ log.debug('MetaMask - injected web3')
 setupDappAutoReload(web3, inpageProvider.publicConfigStore)
 
 // set web3 defaultAccount
-
 inpageProvider.publicConfigStore.subscribe(function (state) {
   web3.eth.defaultAccount = state.selectedAddress
 })
 
-//
-// util
-//
-
 // need to make sure we aren't affected by overlapping namespaces
 // and that we dont affect the app with our namespace
 // mostly a fix for web3's BigNumber if AMD's "define" is defined...
 var __define
 
+/**
+ * Caches reference to global define object and deletes it to
+ * avoid conflicts with other global define objects, such as
+ * AMD's define function
+ */
 function cleanContextForImports () {
   __define = global.define
   try {
@@ -65,6 +65,9 @@ function cleanContextForImports () {
   }
 }
 
+/**
+ * Restores global define object from cached reference
+ */
 function restoreContextAfterImports () {
   try {
     global.define = __define
diff --git a/app/scripts/lib/createProviderMiddleware.js b/app/scripts/lib/createProviderMiddleware.js
index 4e667bac2..8a939ba4e 100644
--- a/app/scripts/lib/createProviderMiddleware.js
+++ b/app/scripts/lib/createProviderMiddleware.js
@@ -1,6 +1,10 @@
 module.exports = createProviderMiddleware
 
-// forward requests to provider
+/**
+ * Forwards an HTTP request to the current Web3 provider
+ *
+ * @param {{ provider: Object }} config Configuration containing current Web3 provider
+ */
 function createProviderMiddleware ({ provider }) {
   return (req, res, next, end) => {
     provider.sendAsync(req, (err, _res) => {
diff --git a/app/scripts/lib/port-stream.js b/app/scripts/lib/port-stream.js
index a9716fb00..5c4224fd9 100644
--- a/app/scripts/lib/port-stream.js
+++ b/app/scripts/lib/port-stream.js
@@ -6,6 +6,13 @@ module.exports = PortDuplexStream
 
 inherits(PortDuplexStream, Duplex)
 
+/**
+ * Creates a stream that's both readable and writable.
+ * The stream supports arbitrary objects.
+ *
+ * @class
+ * @param {Object} port Remote Port object
+ */
 function PortDuplexStream (port) {
   Duplex.call(this, {
     objectMode: true,
@@ -15,8 +22,13 @@ function PortDuplexStream (port) {
   port.onDisconnect.addListener(this._onDisconnect.bind(this))
 }
 
-// private
-
+/**
+ * Callback triggered when a message is received from
+ * the remote Port associated with this Stream.
+ *
+ * @private
+ * @param {Object} msg - Payload from the onMessage listener of Port
+ */
 PortDuplexStream.prototype._onMessage = function (msg) {
   if (Buffer.isBuffer(msg)) {
     delete msg._isBuffer
@@ -27,14 +39,31 @@ PortDuplexStream.prototype._onMessage = function (msg) {
   }
 }
 
+/**
+ * Callback triggered when the remote Port
+ * associated with this Stream disconnects.
+ *
+ * @private
+ */
 PortDuplexStream.prototype._onDisconnect = function () {
   this.destroy()
 }
 
-// stream plumbing
-
+/**
+ * Explicitly sets read operations to a no-op
+ */
 PortDuplexStream.prototype._read = noop
 
+
+/**
+ * Called internally when data should be written to
+ * this writable stream.
+ * 
+ * @private
+ * @param {*} msg Arbitrary object to write
+ * @param {string} encoding Encoding to use when writing payload
+ * @param {Function} cb Called when writing is complete or an error occurs
+ */
 PortDuplexStream.prototype._write = function (msg, encoding, cb) {
   try {
     if (Buffer.isBuffer(msg)) {
diff --git a/app/scripts/lib/setupMetamaskMeshMetrics.js b/app/scripts/lib/setupMetamaskMeshMetrics.js
index 40343f017..02690a948 100644
--- a/app/scripts/lib/setupMetamaskMeshMetrics.js
+++ b/app/scripts/lib/setupMetamaskMeshMetrics.js
@@ -1,6 +1,9 @@
 
 module.exports = setupMetamaskMeshMetrics
 
+/**
+ * Injects an iframe into the current document for testing
+ */
 function setupMetamaskMeshMetrics() {
   const testingContainer = document.createElement('iframe')
   testingContainer.src = 'https://metamask.github.io/mesh-testing/'
diff --git a/app/scripts/popup-core.js b/app/scripts/popup-core.js
index 2e4334bb1..6325b8a8d 100644
--- a/app/scripts/popup-core.js
+++ b/app/scripts/popup-core.js
@@ -7,10 +7,14 @@ const launchMetamaskUi = require('../../ui')
 const StreamProvider = require('web3-stream-provider')
 const setupMultiplex = require('./lib/stream-utils.js').setupMultiplex
 
-
 module.exports = initializePopup
 
-
+/**
+ * Asynchronously initializes the MetaMask popup UI
+ *
+ * @param {{ container: Element, connectionStream: * }} config Popup configuration object 
+ * @param {Function} cb Called when initialization is complete
+ */
 function initializePopup ({ container, connectionStream }, cb) {
   // setup app
   async.waterfall([
@@ -19,6 +23,12 @@ function initializePopup ({ container, connectionStream }, cb) {
   ], cb)
 }
 
+/**
+ * Establishes streamed connections to background scripts and a Web3 provider
+ *
+ * @param {PortDuplexStream} connectionStream PortStream instance establishing a background connection
+ * @param {Function} cb Called when controller connection is established
+ */
 function connectToAccountManager (connectionStream, cb) {
   // setup communication with background
   // setup multiplexing
@@ -28,6 +38,11 @@ function connectToAccountManager (connectionStream, cb) {
   setupWeb3Connection(mx.createStream('provider'))
 }
 
+/**
+ * Establishes a streamed connection to a Web3 provider
+ *
+ * @param {PortDuplexStream} connectionStream PortStream instance establishing a background connection
+ */
 function setupWeb3Connection (connectionStream) {
   var providerStream = new StreamProvider()
   providerStream.pipe(connectionStream).pipe(providerStream)
@@ -38,6 +53,12 @@ function setupWeb3Connection (connectionStream) {
   global.eth = new Eth(providerStream)
 }
 
+/**
+ * Establishes a streamed connection to the background account manager
+ *
+ * @param {PortDuplexStream} connectionStream PortStream instance establishing a background connection
+ * @param {Function} cb Called when the remote account manager connection is established
+ */
 function setupControllerConnection (connectionStream, cb) {
   // this is a really sneaky way of adding EventEmitter api
   // to a bi-directional dnode instance