├── .gitignore ├── LICENSE ├── README.md ├── bitcoin-a-day-env-template.json ├── bitcoin-a-day-lambda-role-policy-document.json ├── encryption-key-policy-template.json ├── index.js ├── package.json ├── setup.sh └── targets-template.json /.gitignore: -------------------------------------------------------------------------------- 1 | run-setup.sh 2 | encryption-key-policy.json 3 | bitcoin-a-day-*.zip 4 | bitcoin-a-day-env.json 5 | targets.json 6 | output.txt 7 | node_modules -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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2 | const crypto = require('crypto'); 3 | const got = require('got'); 4 | 5 | const CURRENCY_PAIR = 'btceur'; 6 | const TICKER_URL = 'https://www.bitstamp.net/api/v2/ticker/' + CURRENCY_PAIR + '/'; 7 | const BUY_LIMIT_ORDER_URL = 'https://www.bitstamp.net/api/v2/buy/' + CURRENCY_PAIR + '/'; 8 | 9 | if (!AWS.config.region) { 10 | AWS.config.update({region: 'eu-central-1'}); 11 | } 12 | 13 | const ENCRYPTED_BITSTAMP_CUSTOMER_ID = process.env['BITSTAMP_CUSTOMER_ID']; 14 | const ENCRYPTED_BITSTAMP_KEY = process.env['BITSTAMP_KEY']; 15 | const ENCRYPTED_BITSTAMP_SECRET = process.env['BITSTAMP_SECRET']; 16 | const VALUE = Number(process.env['VALUE']); 17 | const MINIMUM_VALUE = 5; 18 | 19 | if (isNaN(VALUE) || VALUE < MINIMUM_VALUE) { 20 | throw new Error("Invalid value [" + value + "], must be a number not less than [" + MINIMUM_VALUE + "]."); 21 | } 22 | 23 | let BITSTAMP_PROPERTIES; 24 | 25 | const kms = new AWS.KMS(); 26 | 27 | const decrypt = function(encrypted) { 28 | return new Promise(function(resolve, reject) { 29 | kms 30 | .decrypt({ CiphertextBlob: new Buffer(encrypted, 'base64') }) 31 | .promise() 32 | .then(data => resolve(data.Plaintext.toString('ascii'))) 33 | .catch(reject) 34 | }); 35 | }; 36 | const decryptBitstampProperties = function() { 37 | return new Promise(function(resolve, reject){ 38 | Promise 39 | .all([ 40 | decrypt(ENCRYPTED_BITSTAMP_CUSTOMER_ID), 41 | decrypt(ENCRYPTED_BITSTAMP_KEY), 42 | decrypt(ENCRYPTED_BITSTAMP_SECRET)]) 43 | .then(values => { 44 | BITSTAMP_PROPERTIES = { customerId: values[0], key: values[1], secret: values[2] }; 45 | resolve(BITSTAMP_PROPERTIES); 46 | }) 47 | .catch(reject); 48 | })}; 49 | 50 | 51 | const doWithBitstampProperties = function() { 52 | return new Promise(function(resolve, reject){ 53 | if (BITSTAMP_PROPERTIES) { 54 | resolve(BITSTAMP_PROPERTIES); 55 | } else { 56 | decryptBitstampProperties().then(resolve).catch(reject); 57 | } 58 | }); 59 | }; 60 | 61 | const createAuthData = function(customerId, key, secret) { 62 | let nonce = (new Date()).getTime(); 63 | let message = nonce + customerId + key; 64 | let signature = crypto.createHmac('sha256', new Buffer(secret, 'utf8')).update(message).digest('hex').toUpperCase(); 65 | return { key, signature, nonce}; 66 | }; 67 | 68 | const getAskPrice = new Promise(function(resolve, reject){ 69 | 70 | got(TICKER_URL).then(response => { 71 | let result = JSON.parse(response.body); 72 | let ask = Number(result.ask); 73 | if (!isNaN(ask)) { 74 | resolve(ask); 75 | } else { 76 | throw new Error("Could not parse the ask price from [" + BTCEUR_TICKER_URL + "] response:\n" + response.body); 77 | } 78 | }).catch(reject); 79 | }); 80 | 81 | const buyLimitOrder = function(customerId, key, secret, value, askPrice) { 82 | 83 | let amount = value / askPrice; 84 | 85 | let roundedAmount = Math.ceil(amount * Math.pow(10,5)) / Math.pow(10,5); 86 | 87 | let order = createAuthData(customerId, key, secret); 88 | order.amount = roundedAmount; 89 | order.price = askPrice; 90 | return new Promise(function(resolve, reject) { 91 | console.log("Buying " + roundedAmount + " of BTC for price " + askPrice + " for total value of " + (roundedAmount * askPrice) + "."); 92 | got.post(BUY_LIMIT_ORDER_URL, { 93 | body : order, 94 | form: true 95 | }).then(response => { 96 | let result = JSON.parse(response.body); 97 | resolve(result); 98 | }).catch(reject); 99 | }); 100 | }; 101 | 102 | const getAskPriceAndBuyLimitOrder = function(customerId, key, secret, value) { 103 | return new Promise(function(resolve, reject) { 104 | getAskPrice 105 | .then(askPrice => buyLimitOrder(customerId, key, secret, value, askPrice).then(resolve).catch(reject)) 106 | .catch(reject); 107 | }); 108 | }; 109 | 110 | exports.handler = (event, context, callback) => { 111 | doWithBitstampProperties() 112 | .then(bitstampProperties => 113 | getAskPriceAndBuyLimitOrder(bitstampProperties.customerId, bitstampProperties.key, bitstampProperties.secret, VALUE) 114 | .then(result => callback(null, result)) 115 | .catch(error => callback(error))) 116 | .catch(error => callback(error)); 117 | }; -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name" : "bitcoin-a-day", 3 | "dependencies": { 4 | "aws-sdk": ">= 2.0.9", 5 | "got": ">=7.1.0" 6 | }, 7 | "repository": { 8 | "type": "git", 9 | "url": "git://github.com/highsource/bitcoin-a-day.git" 10 | }, 11 | "license" : "Apache-2.0" 12 | } 13 | -------------------------------------------------------------------------------- /setup.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | bitstamp_customer_id=$1 3 | bitstamp_key=$2 4 | bitstamp_secret=$3 5 | value=$4 6 | random_id=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1) 7 | bitcoin_a_day=bitcoin-a-day-"${random_id}" 8 | 9 | rm output.txt 10 | 11 | npm install 12 | chmod 777 index.js 13 | chmod -R 777 node_modules 14 | zip -q -r "${bitcoin_a_day}" index.js node_modules package.json 15 | 16 | iam_role_name="${bitcoin_a_day}"-lambda 17 | echo Creating IAM role "${iam_role_name}" for the lambda function. 18 | aws iam create-role --role-name "${iam_role_name}" --assume-role-policy-document file://bitcoin-a-day-lambda-role-policy-document.json --query "Role.Arn" --output text 19 | iam_role_arn_query='Roles[?RoleName==`'"${iam_role_name}"'`].Arn' 20 | iam_role_arn=$(aws iam list-roles --query "${iam_role_arn_query}" --output text) 21 | echo IAM role name for the lambda function: ${iam_role_name} >> output.txt 22 | echo IAM role ARN for the lambda function: ${iam_role_arn} >> output.txt 23 | 24 | echo Attaching IAM policy arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole to lambda function role "${iam_role_name}" 25 | aws iam attach-role-policy --role-name "${iam_role_name}" --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole 26 | sleep 5s 27 | 28 | echo Creating encryption key policy. 29 | owner_id=$(aws ec2 describe-security-groups --group-names 'Default' --query 'SecurityGroups[0].OwnerId' --output text) 30 | sed -e "s!@owner_id@!${owner_id}!g; s!@iam_role_arn@!${iam_role_arn}!g" encryption-key-policy-template.json > encryption-key-policy.json 31 | echo Creating encryption key. 32 | encryption_key_id=$(aws kms create-key --policy fileb://encryption-key-policy.json --description "Bitcoin A Day" --query KeyMetadata.KeyId --output text) 33 | echo Encryption key id: ${encryption_key_id} >> output.txt 34 | encryption_key_alias=alias/"${bitcoin_a_day}"-encryption-key 35 | echo Creating encryption key alias "${encryption_key_alias}". 36 | aws kms create-alias --alias-name "${encryption_key_alias}" --target-key-id "${encryption_key_id}" 37 | echo Encryption key alias: ${encryption_key_alias} >> output.txt 38 | encryption_key_arn=$(aws kms describe-key --key-id "${encryption_key_id}" --query KeyMetadata.Arn) 39 | echo Encryption key ARN: "${encryption_key_arn}" >> output.txt 40 | 41 | echo Encrypting Bitstamp customer id, key and secret. 42 | encrypted_bitstamp_customer_id=$(aws kms encrypt --key-id "${encryption_key_id}" --plaintext "${bitstamp_customer_id}" --query CiphertextBlob --output text) 43 | encrypted_bitstamp_key=$(aws kms encrypt --key-id "${encryption_key_id}" --plaintext "${bitstamp_key}" --query CiphertextBlob --output text) 44 | encrypted_bitstamp_secret=$(aws kms encrypt --key-id "${encryption_key_id}" --plaintext "${bitstamp_secret}" --query CiphertextBlob --output text) 45 | echo Encrypted Bitstamp customer id: "${encrypted_bitstamp_customer_id}" >> output.txt 46 | echo Encrypted Bitstamp key: "${encrypted_bitstamp_key}" >> output.txt 47 | echo Encrypted Bitstamp secret: "${encrypted_bitstamp_secret}" >> output.txt 48 | 49 | echo Creating environment properties for the lambda function. 50 | sed -e "s!@encrypted_bitstamp_customer_id@!${encrypted_bitstamp_customer_id}!g; s!@encrypted_bitstamp_key@!${encrypted_bitstamp_key}!g; s!@encrypted_bitstamp_secret@!${encrypted_bitstamp_secret}!g; s!@value@!${value}!g" bitcoin-a-day-env-template.json > bitcoin-a-day-env.json 51 | 52 | echo Creating lambda function. 53 | lambda_function_name="${bitcoin_a_day}" 54 | lambda_function_arn=$(aws lambda create-function --function-name "${lambda_function_name}" --runtime nodejs6.10 --role "$iam_role_arn" --handler index.handler --environment file://bitcoin-a-day-env.json --kms-key-arn "${encryption_key_arn}" --zip-file fileb://"${bitcoin_a_day}".zip --query FunctionArn --output text) 55 | echo Lambda function name: "${lambda_function_name}" >> output.txt 56 | echo Lambda function ARN: "${lambda_function_arn}" >> output.txt 57 | 58 | echo Creating CloudWatch rule to trigger the lambda function. 59 | trigger_rule_name="${lambda_function_name}"-rule 60 | trigger_rule_arn=$(aws events put-rule --name "${trigger_rule_name}" --schedule-expression "cron(0 12 * * ? *)" --query RuleArn --output text) 61 | echo CloudWatch trigger rule name: "${trigger_rule_name}" >> output.txt 62 | echo CloudWatch trigger rule ARN: "${trigger_rule_arn}" >> output.txt 63 | trigger_rule_statement_id="${trigger_rule_name}"-event 64 | aws lambda add-permission --function-name "${lambda_function_name}" --statement-id "${trigger_rule_statement_id}" --action "lambda:InvokeFunction" --principal events.amazonaws.com --source-arn "${trigger_rule_arn}" 65 | sed -e "s!@lambda_function_arn@!${lambda_function_arn}!g" targets-template.json > targets.json 66 | aws events put-targets --rule "${trigger_rule_name}" --targets file://targets.json -------------------------------------------------------------------------------- /targets-template.json: -------------------------------------------------------------------------------- 1 | [ 2 | { 3 | "Id": "1", 4 | "Arn": "@lambda_function_arn@" 5 | } 6 | ] --------------------------------------------------------------------------------