make SMS verification contract general purpose

js/src/contracts/verification.js

@@ -0,0 +1,87 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import subscribeToEvent from '../util/subscribe-to-event';
+
+export const checkIfVerified = (contract, account) => {
+  return contract.instance.certified.call({}, [account]);
+};
+
+export const checkIfRequested = (contract, account) => {
+  let subId = null;
+  let resolved = false;
+
+  return new Promise((resolve, reject) => {
+    contract
+      .subscribe('Requested', {
+        fromBlock: 0, toBlock: 'pending'
+      }, (err, logs) => {
+        if (err) {
+          return reject(err);
+        }
+        const e = logs.find((l) => {
+          return l.type === 'mined' && l.params.who && l.params.who.value === account;
+        });
+
+        resolve(e ? e.transactionHash : false);
+        resolved = true;
+
+        if (subId) {
+          contract.unsubscribe(subId);
+        }
+      })
+      .then((_subId) => {
+        subId = _subId;
+
+        if (resolved) {
+          contract.unsubscribe(subId);
+        }
+      });
+  });
+};
+
+const blockNumber = (api) => {
+  return new Promise((resolve, reject) => {
+    api.subscribe('eth_blockNumber', (err, block) => {
+      if (err) {
+        return reject(err);
+      }
+      resolve(block);
+    })
+    .then((subscription) => {
+      api.unsubscribe(subscription);
+    })
+    .catch(reject);
+  });
+};
+
+export const awaitPuzzle = (api, contract, account) => {
+  return blockNumber(api)
+    .then((block) => {
+      return new Promise((resolve, reject) => {
+        const subscription = subscribeToEvent(contract, 'Puzzled', {
+          from: block.toNumber(),
+          filter: (log) => log.params.who.value === account
+        });
+        subscription.once('error', reject);
+        subscription.once('log', subscription.unsubscribe);
+        subscription.once('log', resolve);
+        subscription.once('timeout', () => {
+          reject(new Error('Timed out waiting for the puzzle.'));
+        });
+      });
+    });
+};