fix check for txid

lib/server.js

@@ -444,6 +444,9 @@ WalletService.prototype.getWalletFromIdentifier = function(opts, cb) {
       return self.storage.fetchWallet(walletId, cb);
     }
 
+    var re = /^[\da-f]+$/gi;
+    if (!re.test(opts.identifier)) return cb();
+
     // Is identifier a txid form an incomming tx?
     var coinNetworkPairs = [];
     _.each(_.values(Constants.COINS), function(coin) {
@@ -456,26 +459,24 @@ WalletService.prototype.getWalletFromIdentifier = function(opts, cb) {
     });
     async.detectSeries(coinNetworkPairs, function(coinNetwork, nextCoinNetwork) {
       var bc = self._getBlockchainExplorer(coinNetwork.coin, coinNetwork.network);
+      if (!bc) return nextCoinNetwork(false);
       bc.getTransaction(opts.identifier, function(err, tx) {
-        if (err || !tx) return nextCoinNetwork(err, false);
+        if (err || !tx) return nextCoinNetwork(false);
         var outputs = _.first(self._normalizeTxHistory(tx)).outputs;
         var toAddresses = _.pluck(outputs, 'address');
         async.detect(toAddresses, function(addressStr, nextAddress) {
           self.storage.fetchAddressByCoin(coinNetwork.coin, addressStr, function(err, address) {
-            if (err || !address) return nextAddress(err, false);
+            if (err || !address) return nextAddress(false);
             walletId = address.walletId;
-            nextAddress(null, true);
+            nextAddress(true);
           });
-        }, function(err) {
-          nextCoinNetwork(err, !!walletId);
+        }, function() {
+          nextCoinNetwork(!!walletId);
         });
       });
-    }, function(err) {
-      if (err) return cb(err);
-      if (walletId) {
-        return self.storage.fetchWallet(walletId, cb);
-      }
-      cb();
+    }, function(walletId) {
+      if (!walletId) return cb();
+      return self.storage.fetchWallet(walletId, cb);
     });
   });
 };
@@ -1062,7 +1063,13 @@ WalletService.prototype._getBlockchainExplorer = function(coin, network) {
   opts.coin = coin;
   opts.network = network;
   opts.userAgent = WalletService.getServiceVersion();
-  return new BlockchainExplorer(opts);
+  var bc;
+  try {
+    bc = new BlockchainExplorer(opts);
+  } catch (ex) {
+    log.warn('Could not instantiate blockchain explorer', ex);
+  }
+  return bc;
 };
 
 WalletService.prototype._getUtxos = function(coin, addresses, cb) {