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logout_user.js
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logout_user.js
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const aws = require('aws-sdk');
const moment = require('moment');
const uuidv4 = require('uuid/v4');
let DevicesTableName = process.env.dynamodb_devices_table_name;
let UsersTableName = process.env.dynamodb_users_table_name;
function stagingOverwrite() {
DevicesTableName = `Dev_${process.env.dynamodb_devices_table_name}`;
UsersTableName = `Dev_${process.env.dynamodb_users_table_name}`;
}
const dynamoDB = new aws.DynamoDB.DocumentClient();
async function getDeviceId(userId) {
const params = {
TableName: UsersTableName,
Key: { user_id: userId },
ProjectionExpression:
'device_id'
};
const data = await dynamoDB.get(params).promise();
return data.Item.device_id;
}
async function updateSession(userId, deviceId) {
const timestamp = moment().format('YYYY-MM-DDTHH:mm:ss');
const params = {
TransactItems: [
{
Update: {
TableName: UsersTableName,
Key: { user_id: userId },
UpdateExpression: 'set #bt = :forceLogin, device_id = :null, #ept = :null, #upd = :now',
ExpressionAttributeNames: { '#bt': 'bearer_token', '#ept': 'expo_push_token', '#upd': 'updated_at' },
ExpressionAttributeValues: {
':forceLogin': uuidv4(),
':null': null,
':now': timestamp
}
}
},
{
Update: {
TableName: DevicesTableName,
Key: { device_id: deviceId },
UpdateExpression: 'set user_id = :null, expo_push_token = :null, updated_at = :now',
ExpressionAttributeValues: {
':null': null,
':now': timestamp
}
}
}
]
};
return dynamoDB.transactWrite(params).promise();
}
exports.handler = async (event) => {
if (event.requestContext.stage === 'staging') { stagingOverwrite(); }
const userId = event.requestContext.authorizer.user_id;
const deviceId = await getDeviceId(userId);
await updateSession(userId, deviceId);
return {
statusCode: 200,
headers: { 'Access-Control-Allow-Origin': '*' },
body: JSON.stringify({
action: 'logout',
success: true,
resource: 'user',
resource_id: userId
})
};
};