support for addressApi=blockchair.com

thanks for suggestion @LiveBit_io

.env-sample

@@ -15,10 +15,9 @@
 #BTCEXP_BITCOIND_RPC_TIMEOUT=5000
 
 # Select optional "address API" to display address tx lists and balances
-# Options: electrumx, blockchain.com, blockcypher.com
+# Options: electrumx, blockchain.com, blockchair.com, blockcypher.com
 # If electrumx set, the BTCEXP_ELECTRUMX_SERVERS variable must also be
-# set. Neither blockchain.com or blockcypher.com support native-segwit bc1...
-# addresses, but are convenient for users who don't run their own ElectrumX.
+# set.
 BTCEXP_ADDRESS_API=(electrumx|blockchain.com|blockcypher.com)
 
 # Optional ElectrumX Servers. See BTCEXP_ADDRESS_API. This value is only

README.md

@@ -21,7 +21,7 @@ Live demos are available at:
 * View transaction details, with navigation "backward" via spent transaction outputs
 * View JSON content used to generate most pages
 * Search by transaction ID, block hash/height, and address
-* Optional transaction history for addresses by querying from ElectrumX, blockchain.com, or blockcypher.com
+* Optional transaction history for addresses by querying from ElectrumX, blockchain.com, blockchair.com, or blockcypher.com
 * Mempool summary, with fee, size, and age breakdowns
 * RPC command browser and terminal
 * Currently supports BTC, LTC (support for any Bitcoin-RPC-protocol-compliant coin can be added easily)

app/api/addressApi.js

@@ -6,10 +6,11 @@ var coinConfig = coins[config.coin];
 
 var electrumAddressApi = require("./electrumAddressApi.js");
 var blockchainAddressApi = require("./blockchainAddressApi.js");
+var blockchairAddressApi = require("./blockchairAddressApi.js");
 var blockcypherAddressApi = require("./blockcypherAddressApi.js");
 
 function getSupportedAddressApis() {
-	return ["blockchain.com", "blockcypher.com", "electrumx"];
+	return ["blockchain.com", "blockchair.com", "blockcypher.com", "electrumx"];
 }
 
 function getCurrentAddressApiFeatureSupport() {
@@ -20,6 +21,13 @@ function getCurrentAddressApiFeatureSupport() {
 			sortAsc: true
 		};
 
+	} else if (config.addressApi == "blockchair.com") {
+		return {
+			pageNumbers: true,
+			sortDesc: true,
+			sortAsc: false
+		};
+
 	} else if (config.addressApi == "blockcypher.com") {
 		return {
 			pageNumbers: true,
@@ -43,6 +51,9 @@ function getAddressDetails(address, scriptPubkey, sort, limit, offset) {
 		if (config.addressApi == "blockchain.com") {
 			promises.push(blockchainAddressApi.getAddressDetails(address, scriptPubkey, sort, limit, offset));
 
+		} else if (config.addressApi == "blockchair.com") {
+			promises.push(blockchairAddressApi.getAddressDetails(address, scriptPubkey, sort, limit, offset));
+
 		} else if (config.addressApi == "blockcypher.com") {
 			promises.push(blockcypherAddressApi.getAddressDetails(address, scriptPubkey, sort, limit, offset));
 

app/api/blockchairAddressApi.js

@@ -0,0 +1,53 @@
+var request = require("request");
+var utils = require("./../utils.js");
+
+
+function getAddressDetails(address, scriptPubkey, sort, limit, offset) {
+	// Note: blockchair api seems to not respect the limit parameter, always using 100
+	return new Promise(function(resolve, reject) {
+		var options = {
+			url: `https://api.blockchair.com/bitcoin/dashboards/address/${address}/?offset=${offset}`,
+			headers: {
+				'User-Agent': 'request'
+			}
+		};
+
+		request(options, function(error, response, body) {
+			if (error == null && response && response.statusCode && response.statusCode == 200) {
+				var responseObj = JSON.parse(body);
+				responseObj = responseObj.data[address];
+
+				var result = {};
+
+				result.txids = [];
+
+				// blockchair doesn't support offset for paging, so simulate up to the hard cap of 2,000
+				for (var i = offset; i < Math.min(responseObj.transactions.length, limit); i++) {
+					var txid = responseObj.transactions[i];
+
+					result.txids.push(txid);
+				}
+
+				result.txCount = responseObj.address.transaction_count;
+				result.totalReceivedSat = responseObj.address.received;
+				result.totalSentSat = responseObj.address.spent;
+				result.balanceSat = responseObj.address.balance;
+				result.source = "blockchair.com";
+
+				resolve({addressDetails:result});
+
+			} else {
+				var fullError = {error:error, response:response, body:body};
+
+				utils.logError("308dhew3w83", fullError);
+
+				reject(fullError);
+			}
+		});
+	});
+}
+
+
+module.exports = {
+	getAddressDetails: getAddressDetails
+};

bin/cli.js

@@ -17,7 +17,7 @@ const args = require('meow')(`
       -u, --bitcoind-user <user>     username for bitcoind rpc [default: none]
       -w, --bitcoind-pass <pass>     password for bitcoind rpc [default: none]
 
-      --address-api <option>         api to use for address queries (options: electrumx, blockchain.com, blockcypher.com) [default: none]
+      --address-api <option>         api to use for address queries (options: electrumx, blockchain.com, blockchair.com, blockcypher.com) [default: none]
       -E, --electrumx-servers <..>   comma separated list of electrum servers to use for address queries; only used if --address-api=electrumx [default: none]
 
       --rpc-allowall                 allow all rpc commands [default: false]

routes/baseActionsRouter.js

@@ -664,15 +664,14 @@ router.get("/address/:address", function(req, res, next) {
 
 						if (addressDetails.txids) {
 							var txids = addressDetails.txids;
-							var blockHeightsByTxid = addressDetails.blockHeightsByTxid;
+							var blockHeightsByTxid = {};
 
 							res.locals.txids = txids;
 							
 							coreApi.getRawTransactionsWithInputs(txids).then(function(rawTxResult) {
 								res.locals.transactions = rawTxResult.transactions;
 								res.locals.txInputsByTransaction = rawTxResult.txInputsByTransaction;
-								res.locals.blockHeightsByTxid = blockHeightsByTxid;
-
+								
 								var addrGainsByTx = {};
 								var addrLossesByTx = {};
 
@@ -683,6 +682,8 @@ router.get("/address/:address", function(req, res, next) {
 									var tx = rawTxResult.transactions[i];
 									var txInputs = rawTxResult.txInputsByTransaction[tx.txid];
 
+									blockHeightsByTxid[tx.txid] = tx.height;
+
 									for (var j = 0; j < tx.vout.length; j++) {
 										if (tx.vout[j].value > 0 && tx.vout[j].scriptPubKey && tx.vout[j].scriptPubKey.addresses && tx.vout[j].scriptPubKey.addresses.includes(address)) {
 											if (addrGainsByTx[tx.txid] == null) {
@@ -712,6 +713,8 @@ router.get("/address/:address", function(req, res, next) {
 									//debugLog("txInputs: " + JSON.stringify(txInputs));
 								}
 
+								res.locals.blockHeightsByTxid = blockHeightsByTxid;
+
 								resolve();
 
 							}).catch(function(err) {