Add fee estimation functions for dogecoin and litecoin

src/networks.js

@@ -1,10 +1,6 @@
 // https://en.bitcoin.it/wiki/List_of_address_prefixes
 // Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
 
-function bitcoinEstimateFee(txByteSize) {
-  return networks.bitcoin.feePerKb * Math.ceil(txByteSize / 1000)
-}
-
 var networks = {
   bitcoin: {
     magicPrefix: '\x18Bitcoin Signed Message:\n',
@@ -15,9 +11,9 @@ var networks = {
     pubKeyHash: 0x00,
     scriptHash: 0x05,
     wif: 0x80,
-    dustThreshold: 546, // https://github.com/bitcoin/bitcoin/blob/529047fcd18acd1b64dc95d6eb69edeaad75d405/src/core.h#L176-L188
-    feePerKb: 10000, // https://github.com/bitcoin/bitcoin/blob/3f39b9d4551d729c3a2e4decd810ac6887cfaeb3/src/main.cpp#L52
-    estimateFee: bitcoinEstimateFee
+    dustThreshold: 546,
+    feePerKb: 10000,
+    estimateFee: estimateFee('bitcoin')
   },
   dogecoin: {
     magicPrefix: '\x19Dogecoin Signed Message:\n',
@@ -29,7 +25,9 @@ var networks = {
     scriptHash: 0x16,
     wif: 0x9e,
     dustThreshold: 0,
-    feePerKb: 100000000
+    dustSoftThreshold: 100000000,
+    feePerKb: 100000000,
+    estimateFee: estimateFee('dogecoin')
   },
   litecoin: {
     magicPrefix: '\x19Litecoin Signed Message:\n',
@@ -41,7 +39,9 @@ var networks = {
     scriptHash: 0x05,
     wif: 0xb0,
     dustThreshold: 0,
-    feePerKb: 100000
+    dustSoftThreshold: 100000,
+    feePerKb: 100000,
+    estimateFee: estimateFee('litecoin')
   },
   testnet: {
     magicPrefix: '\x18Bitcoin Signed Message:\n',
@@ -54,7 +54,27 @@ var networks = {
     wif: 0xef,
     dustThreshold: 546,
     feePerKb: 10000,
-    estimateFee: bitcoinEstimateFee
+    estimateFee: estimateFee('bitcoin')
   }
 }
+
+function estimateFee(type) {
+  return function(tx) {
+    var network = networks[type]
+    var baseFee = network.feePerKb
+    var byteSize = tx.toBuffer().length
+
+    var fee = baseFee * Math.ceil(byteSize / 1000)
+    if(network.dustSoftThreshold == undefined) return fee
+
+    tx.outs.forEach(function(e){
+      if(e.value < network.dustSoftThreshold) {
+        fee += baseFee
+      }
+    })
+
+    return fee
+  }
+}
+
 module.exports = networks