verification: check if server is running

See also ethcore/email-verification#67c6466 and ethcore/sms-verification#a585e42.

js/src/3rdparty/email-verification/index.js

@@ -16,6 +16,19 @@
 
 import { stringify } from 'querystring';
 
+export const isServerRunning = (isTestnet = false) => {
+  const port = isTestnet ? 28443 : 18443;
+  return fetch(`https://email-verification.parity.io:${port}/health`, {
+    mode: 'cors', cache: 'no-store'
+  })
+    .then((res) => {
+      return res.ok;
+    })
+    .catch(() => {
+      return false;
+    });
+};
+
 export const postToServer = (query, isTestnet = false) => {
   const port = isTestnet ? 28443 : 18443;
   query = stringify(query);

js/src/3rdparty/sms-verification/index.js

@@ -16,6 +16,19 @@
 
 import { stringify } from 'querystring';
 
+export const isServerRunning = (isTestnet = false) => {
+  const port = isTestnet ? 8443 : 443;
+  return fetch(`https://sms-verification.parity.io:${port}/health`, {
+    mode: 'cors', cache: 'no-store'
+  })
+    .then((res) => {
+      return res.ok;
+    })
+    .catch(() => {
+      return false;
+    });
+};
+
 export const postToServer = (query, isTestnet = false) => {
   const port = isTestnet ? 8443 : 443;
   query = stringify(query);

js/src/modals/Verification/email-store.js

@@ -21,7 +21,7 @@ import EmailVerificationABI from '~/contracts/abi/email-verification.json';
 import VerificationStore, {
   LOADING, QUERY_DATA, QUERY_CODE, POSTED_CONFIRMATION, DONE
 } from './store';
-import { postToServer } from '../../3rdparty/email-verification';
+import { isServerRunning, postToServer } from '../../3rdparty/email-verification';
 
 const EMAIL_VERIFICATION = 7; // id in the `BadgeReg.sol` contract
 
@@ -59,6 +59,10 @@ export default class EmailVerificationStore extends VerificationStore {
     super(api, EmailVerificationABI, EMAIL_VERIFICATION, account, isTestnet);
   }
 
+  isServerRunning = () => {
+    return isServerRunning(this.isTestnet);
+  }
+
   requestValues = () => [ sha3.text(this.email) ]
 
   @action setEmail = (email) => {

js/src/modals/Verification/sms-store.js

@@ -21,7 +21,7 @@ import SMSVerificationABI from '~/contracts/abi/sms-verification.json';
 import VerificationStore, {
   LOADING, QUERY_DATA, QUERY_CODE, POSTED_CONFIRMATION, DONE
 } from './store';
-import { postToServer } from '../../3rdparty/sms-verification';
+import { isServerRunning, postToServer } from '../../3rdparty/sms-verification';
 
 const SMS_VERIFICATION = 0; // id in the `BadgeReg.sol` contract
 
@@ -58,6 +58,10 @@ export default class SMSVerificationStore extends VerificationStore {
     super(api, SMSVerificationABI, SMS_VERIFICATION, account, isTestnet);
   }
 
+  isServerRunning = () => {
+    return isServerRunning(this.isTestnet);
+  }
+
   @action setNumber = (number) => {
     this.number = number;
   }

js/src/modals/Verification/store.js

@@ -40,6 +40,7 @@ export default class VerificationStore {
   @observable fee = null;
   @observable isVerified = null;
   @observable hasRequested = null;
+  @observable isServerRunning = null;
   @observable consentGiven = false;
   @observable requestTx = null;
   @observable code = '';
@@ -73,6 +74,14 @@ export default class VerificationStore {
     const { contract, account } = this;
     this.step = LOADING;
 
+    const isServerRunning = this.isServerRunning()
+      .then((isRunning) => {
+        this.isServerRunning = isRunning;
+      })
+      .catch((err) => {
+        this.error = 'Failed to check if server is running: ' + err.message;
+      });
+
     const fee = contract.instance.fee.call()
       .then((fee) => {
         this.fee = fee;
@@ -101,7 +110,7 @@ export default class VerificationStore {
       });
 
     Promise
-      .all([ fee, isVerified, hasRequested ])
+      .all([ isServerRunning, fee, isVerified, hasRequested ])
       .then(() => {
         this.step = QUERY_DATA;
       });