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app.js
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app.js
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const https = require('https');
const AWS = require('aws-sdk');
const config = require('./config');
// Set the region
AWS.config.update({region: config.REGION});
// The DocumentClient class allows us to interact with DynamoDB using normal objects.
const dynamoDb = new AWS.DynamoDB.DocumentClient();
// Create the Iot Client
const iot = new AWS.Iot();
const iotdata = new AWS.IotData({
egion: config.REGION,
endpoint: config.IOT_DATA_ENDPOINT
});
// Search User identity information from Dynamodb
let findDataBySerialNumber = ( serialNumber ) => {
var queryParams = {
TableName: config.DYNAMODB_TABLE_NAME,
KeyConditionExpression: "serialNumber = :a",
ExpressionAttributeValues: {
":a": serialNumber
}
}
return dynamoDb.query(queryParams).promise();
}
// Put IoT cert info into Dynamodb
let putCertinfo = ( serialNumber, certificateArn ) => {
var updateParams = {
TableName: config.DYNAMODB_TABLE_NAME,
Key:{
"serialNumber": serialNumber
},
UpdateExpression: "set certinfo = :r",
ExpressionAttributeValues:{
":r": certificateArn
},
ReturnValues:"UPDATED_NEW"
}
return dynamoDb.update(updateParams).promise();
}
let createCert = ( serialNumber ) => {
// Create certificate
var createCertParams = {
setAsActive: true
};
return iot.createKeysAndCertificate(createCertParams).promise().then(certdata => {
console.log("create certificate:");
console.log(JSON.stringify(certdata));
// Attach policy & thing for cert in parallel
var attachPolicyParams = {
policyName: serialNumber,
target: certdata.certificateArn
};
var attachThingParams = {
thingName: serialNumber,
principal: certdata.certificateArn
};
return Promise.all([
iot.attachPolicy(attachPolicyParams).promise(),
iot.attachThingPrincipal(attachThingParams).promise()
]).then(() => {
console.log('attached policy and thing to certificate')
return certdata;
});
})
}
// Apply cert & Attach thing, policy
let issueCert = ( serialNumber ) => {
// Create Policy & Thing in parallel
var createPolicyParams = {
policyName: serialNumber,
policyDocument: config.POLICY_DOCUMENT
};
var createThingParams = {
thingName: serialNumber,
attributePayload: {
attributes: {
'RegistrationWay': 'CVM'
},
merge: true
}
};
return Promise.all([
iot.createPolicy(createPolicyParams).promise(),
iot.createThing(createThingParams).promise(),
]).then(values => {
console.log('created policy and thing', values)
return createCert(serialNumber);
});
}
let reissueCert = ( serialNumber, certificateArn ) => {
// Detach the certificate Policy and Thing in parallel
var detachPolicyParams = {
policyName: serialNumber,
target: certificateArn
};
var detachThingParams = {
thingName: serialNumber,
principal: certificateArn
};
return Promise.all([
iot.detachPolicy(detachPolicyParams).promise(),
iot.detachThingPrincipal(detachThingParams).promise()
]).then(() => {
console.log('detached policy and thing')
// Update certificate to inactive and delete
var certificateId = certificateArn.split('/')[1];
var updateCertParams = {
certificateId: certificateId,
newStatus: 'INACTIVE'
};
return iot.updateCertificate(updateCertParams).promise().then(() => {
console.log('updated certificate to inactive')
var deleteCertParams = {
certificateId: certificateId,
forceDelete: false
};
return iot.deleteCertificate(deleteCertParams).promise().then(() => {
console.log('certificate deleted');
return createCert(serialNumber)
});
});
});
}
let filterKeys = (obj) => {
// Filter out keys that are not allowed
const blacklist = new RegExp(config.IOT_SHADOW_BLACKLIST_KEYS);
const whitelist = new RegExp(config.IOT_SHADOW_WHITELIST_KEYS || '.*');
Object.keys(obj).forEach(key => (!key.match(whitelist) || key.match(blacklist)) && delete obj[key])
return obj;
}
let getShadow = ( serialNumber ) => {
// Get reported state for thing
var params = {
thingName: serialNumber
}
return iotdata.getThingShadow(params).promise().then(data => {
console.log('get payload', data.payload)
var payload = JSON.parse(data.payload)
// If no reported state return empty obj
if (!('reported' in payload['state'])) {
return {}
}
var reported = payload['state']['reported']
// Remove keys that are now allowed
return filterKeys(reported);
})
}
let updateShadow = ( serialNumber, desired ) => {
// Remove keys that are now allowed
var desired = filterKeys(desired);
// Set desired state for thing (only reported state is updated by device)
var params = {
thingName: serialNumber,
payload: Buffer.from(JSON.stringify({ state: { desired: desired } }))
};
return iotdata.updateThingShadow(params).promise().then(data => {
console.log('update payload', data.payload)
var payload = JSON.parse(data.payload)
// If no reported state return empty obj
if (!('desired' in payload['state'])) {
return {}
}
return payload['state']['desired']
})
}
// Get VeriSign Class 3 Public Primary G5 root CA certificate
let getIoTRootCA = () => {
return new Promise((resolve, reject) => {
// Make an https request
https.get(config.ROOT_CA_URL, ( response ) => {
var body = [];
response.on('data', function (chunk) {
body.push(chunk);
});
response.on('end', function () {
body = Buffer.concat(body);
resolve(body.toString());
});
response.on('error', reject);
})
});
}
module.exports = {
findDataBySerialNumber,
putCertinfo,
issueCert,
reissueCert,
getShadow,
updateShadow,
getIoTRootCA
}