5 files changed, 162 insertions, 14 deletions
diff --git a/app/scripts/controllers/detect-tokens.js b/app/scripts/controllers/detect-tokens.js
new file mode 100644
index 000000000..195ec918a
--- /dev/null
+++ b/app/scripts/controllers/detect-tokens.js
@@ -0,0 +1,130 @@
+const Web3 = require('web3')
+const contracts = require('eth-contract-metadata')
+const { warn } = require('loglevel')
+const { MAINNET } = require('./network/enums')
+// By default, poll every 3 minutes
+const DEFAULT_INTERVAL = 180 * 1000
+const ERC20_ABI = [{'constant': true, 'inputs': [{'name': '_owner', 'type': 'address'}], 'name': 'balanceOf', 'outputs': [{'name': 'balance', 'type': 'uint256'}], 'payable': false, 'type': 'function'}]
+
+/**
+ * A controller that polls for token exchange
+ * rates based on a user's current token list
+ */
+class DetectTokensController {
+  /**
+   * Creates a DetectTokensController
+   *
+   * @param {Object} [config] - Options to configure controller
+   */
+  constructor ({ interval = DEFAULT_INTERVAL, preferences, network, keyringMemStore } = {}) {
+    this.preferences = preferences
+    this.interval = interval
+    this.network = network
+    this.keyringMemStore = keyringMemStore
+  }
+
+  /**
+   * For each token in eth-contract-metada, find check selectedAddress balance.
+   *
+   */
+  async detectNewTokens () {
+    if (!this.isActive) { return }
+    if (this._network.store.getState().provider.type !== MAINNET) { return }
+    this.web3.setProvider(this._network._provider)
+    for (const contractAddress in contracts) {
+      if (contracts[contractAddress].erc20 && !(this.tokenAddresses.includes(contractAddress.toLowerCase()))) {
+        this.detectTokenBalance(contractAddress)
+      }
+    }
+  }
+
+   /**
+   * Find if selectedAddress has tokens with contract in contractAddress.
+   *
+   * @param {string} contractAddress Hex address of the token contract to explore.
+   * @returns {boolean} If balance is detected, token is added.
+   *
+   */
+  async detectTokenBalance (contractAddress) {
+    const ethContract = this.web3.eth.contract(ERC20_ABI).at(contractAddress)
+    ethContract.balanceOf(this.selectedAddress, (error, result) => {
+      if (!error) {
+        if (!result.isZero()) {
+          this._preferences.addToken(contractAddress, contracts[contractAddress].symbol, contracts[contractAddress].decimals)
+        }
+      } else {
+        warn(`MetaMask - DetectTokensController balance fetch failed for ${contractAddress}.`, error)
+      }
+    })
+  }
+
+  /**
+   * Restart token detection polling period and call detectNewTokens
+   * in case of address change or user session initialization.
+   *
+   */
+  restartTokenDetection () {
+    if (!(this.isActive && this.selectedAddress)) { return }
+    this.detectNewTokens()
+    this.interval = DEFAULT_INTERVAL
+  }
+
+  /**
+   * @type {Number}
+   */
+  set interval (interval) {
+    this._handle && clearInterval(this._handle)
+    if (!interval) { return }
+    this._handle = setInterval(() => { this.detectNewTokens() }, interval)
+  }
+
+  /**
+   * In setter when selectedAddress is changed, detectNewTokens and restart polling
+   * @type {Object}
+   */
+  set preferences (preferences) {
+    if (!preferences) { return }
+    this._preferences = preferences
+    preferences.store.subscribe(({ tokens }) => { this.tokenAddresses = tokens.map((obj) => { return obj.address }) })
+    preferences.store.subscribe(({ selectedAddress }) => {
+      if (this.selectedAddress !== selectedAddress) {
+        this.selectedAddress = selectedAddress
+        this.restartTokenDetection()
+      }
+    })
+  }
+
+  /**
+   * @type {Object}
+   */
+  set network (network) {
+    if (!network) { return }
+    this._network = network
+    this.web3 = new Web3(network._provider)
+  }
+
+  /**
+   * In setter when isUnlocked is updated to true, detectNewTokens and restart polling
+   * @type {Object}
+   */
+  set keyringMemStore (keyringMemStore) {
+    if (!keyringMemStore) { return }
+    this._keyringMemStore = keyringMemStore
+    this._keyringMemStore.subscribe(({ isUnlocked }) => {
+      if (this.isUnlocked !== isUnlocked) {
+        this.isUnlocked = isUnlocked
+        if (isUnlocked) { this.restartTokenDetection() }
+      }
+    })
+  }
+
+  /**
+   * Internal isActive state
+   * @type {Object}
+   */
+  get isActive () {
+    return this.isOpen && this.isUnlocked
+  }
+}
+
+module.exports = DetectTokensController
diff --git a/app/scripts/controllers/network/enums.js b/app/scripts/controllers/network/enums.js
index 9da7f309c..3190eb37c 100644
--- a/app/scripts/controllers/network/enums.js
+++ b/app/scripts/controllers/network/enums.js
@@ -4,6 +4,7 @@ const KOVAN = 'kovan'
 const MAINNET = 'mainnet'
 const LOCALHOST = 'localhost'
 
+const MAINNET_CODE = 1
 const ROPSTEN_CODE = 3
 const RINKEYBY_CODE = 4
 const KOVAN_CODE = 42
@@ -13,13 +14,13 @@ const RINKEBY_DISPLAY_NAME = 'Rinkeby'
 const KOVAN_DISPLAY_NAME = 'Kovan'
 const MAINNET_DISPLAY_NAME = 'Main Ethereum Network'
 
-
 module.exports = {
   ROPSTEN,
   RINKEBY,
   KOVAN,
   MAINNET,
   LOCALHOST,
+  MAINNET_CODE,
   ROPSTEN_CODE,
   RINKEYBY_CODE,
   KOVAN_CODE,
diff --git a/app/scripts/controllers/preferences.js b/app/scripts/controllers/preferences.js
index b314745f5..f6250dc16 100644
--- a/app/scripts/controllers/preferences.js
+++ b/app/scripts/controllers/preferences.js
@@ -86,6 +86,30 @@ class PreferencesController {
   }
 
   /**
+   * Removes an address from state
+   *
+   * @param {string} address A hex address
+   * @returns {string} the address that was removed
+   */
+  removeAddress (address) {
+    const identities = this.store.getState().identities
+    if (!identities[address]) {
+      throw new Error(`${address} can't be deleted cause it was not found`)
+    }
+    delete identities[address]
+    this.store.updateState({ identities })
+
+    // If the selected account is no longer valid,
+    // select an arbitrary other account:
+    if (address === this.getSelectedAddress()) {
+      const selected = Object.keys(identities)[0]
+      this.setSelectedAddress(selected)
+    }
+    return address
+  }
+
+
+  /**
    * Adds addresses to the identities object without removing identities
    *
    * @param {string[]} addresses An array of hex addresses
diff --git a/app/scripts/controllers/transactions/nonce-tracker.js b/app/scripts/controllers/transactions/nonce-tracker.js
index a27568843..421036368 100644
--- a/app/scripts/controllers/transactions/nonce-tracker.js
+++ b/app/scripts/controllers/transactions/nonce-tracker.js
@@ -120,19 +120,6 @@ class NonceTracker {
     return Number.isInteger(highest) ? highest + 1 : 0
   }
 
-  _reduceTxListToUniqueNonces (txList) {
-    const reducedTxList = txList.reduce((reducedList, txMeta, index) => {
-      if (!index) return [txMeta]
-      const nonceMatches = txList.filter((txData) => {
-        return txMeta.txParams.nonce === txData.txParams.nonce
-      })
-      if (nonceMatches.length > 1) return reducedList
-      reducedList.push(txMeta)
-      return reducedList
-    }, [])
-    return reducedTxList
-  }
-
   _getHighestNonce (txList) {
     const nonces = txList.map((txMeta) => {
       const nonce = txMeta.txParams.nonce
diff --git a/app/scripts/controllers/transactions/tx-state-manager.js b/app/scripts/controllers/transactions/tx-state-manager.js
index 0aae4774b..28a18ca2e 100644
--- a/app/scripts/controllers/transactions/tx-state-manager.js
+++ b/app/scripts/controllers/transactions/tx-state-manager.js
@@ -288,6 +288,7 @@ class TransactionStateManager extends EventEmitter {
   */
   setTxStatusRejected (txId) {
     this._setTxStatus(txId, 'rejected')
+    this._removeTx(txId)
   }
 
   /**
@@ -422,6 +423,11 @@ class TransactionStateManager extends EventEmitter {
   _saveTxList (transactions) {
     this.store.updateState({ transactions })
   }
+
+  _removeTx (txId) {
+    const transactionList = this.getFullTxList()
+    this._saveTxList(transactionList.filter((txMeta) => txMeta.id !== txId))
+  }
 }
 
 module.exports = TransactionStateManager