/
user.go
151 lines (130 loc) · 3.78 KB
/
user.go
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package user
import (
"encoding/json"
"errors"
"github.com/VDliveson/go-serverless-yt/pkg/validators"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
)
var(
ErrorFailedToUnmarshalRecord = "failed to unmarshal record"
ErrorFailedToFetchRecord = "failed to fetch record"
ErrorInvalidUserData = "invalid user data"
ErrorInvalidEmail = "invalid email"
ErrorCouldNotMarshalItem = "could not marshal item"
ErrorCouldNotDeleteItem = "could not delete item"
ErrorCouldNotDynamoPutItem = "could not dynamo put item"
ErrorUserAlreadyExists = "user.User already exists"
ErrorUserDoesNotExist = "user.User does not exist"
)
type User struct {
Email string `json:"email"`
FirstName string `json:"firstName"`
LastName string `json:"lastName"`
}
func FetchUser(email,tableName string,dynaClient dynamodbiface.DynamoDBAPI)(*User,error){
input := &dynamodb.GetItemInput{
Key: map[string]*dynamodb.AttributeValue{
"email":{
S: aws.String(email),
},
},
TableName: aws.String(tableName),
}
result, err := dynaClient.GetItem(input)
if err!= nil {
return nil, errors.New(ErrorFailedToFetchRecord)
}
item := new(User)
err = dynamodbattribute.UnmarshalMap(result.Item, item)
if err != nil {
return nil, errors.New(ErrorFailedToUnmarshalRecord)
}
return item, nil
}
func FetchUsers(tableName string,dynaClient dynamodbiface.DynamoDBAPI)(*[]User,error){
input:= &dynamodb.ScanInput{
TableName: aws.String(tableName),
}
result,err := dynaClient.Scan(input)
if err != nil{
return nil,errors.New(ErrorFailedToFetchRecord)
}
item:= new([]User)
err = dynamodbattribute.UnmarshalListOfMaps(result.Items,item)
return item,nil
}
func CreateUser(req events.APIGatewayProxyRequest,tableName string,dynaClient dynamodbiface.DynamoDBAPI)(
*User,
error,
){
var u User
if err:= json.Unmarshal([]byte(req.Body), &u);err!=nil{
return nil,errors.New(ErrorInvalidUserData)
}
if !validators.IsEmailValid(u.Email){
return nil,errors.New(ErrorInvalidEmail)
}
currentUser,_ := FetchUser(u.Email,tableName,dynaClient)
if currentUser != nil && len(currentUser.Email)!=0 {
return nil,errors.New(ErrorUserAlreadyExists)
}
av,err:= dynamodbattribute.MarshalMap(u)
if err != nil {
return nil, errors.New(ErrorCouldNotMarshalItem)
}
input := &dynamodb.PutItemInput{
Item: av,
TableName: aws.String(tableName),
}
_, err = dynaClient.PutItem(input)
if err != nil {
return nil, errors.New(ErrorCouldNotDynamoPutItem)
}
return &u, nil
}
func UpdateUser(req events.APIGatewayProxyRequest, tableName string, dynaClient dynamodbiface.DynamoDBAPI)(
*User,
error,
){
var u User
if err := json.Unmarshal([]byte(req.Body), &u); err !=nil {
return nil, errors.New(ErrorInvalidEmail)
}
currentUser, _ := FetchUser(u.Email, tableName, dynaClient)
if currentUser !=nil && len (currentUser.Email) == 0{
return nil, errors.New(ErrorUserDoesNotExist)
}
av, err := dynamodbattribute.MarshalMap(u)
if err != nil {
return nil, errors.New(ErrorCouldNotMarshalItem)
}
input := &dynamodb.PutItemInput{
Item: av,
TableName: aws.String(tableName),
}
_, err = dynaClient.PutItem(input)
if err!=nil {
return nil, errors.New(ErrorCouldNotDynamoPutItem)
}
return &u, nil
}
func DeleteUser(req events.APIGatewayProxyRequest, tableName string, dynaClient dynamodbiface.DynamoDBAPI) error {
email := req.QueryStringParameters["email"]
input:= &dynamodb.DeleteItemInput{
Key: map[string]*dynamodb.AttributeValue{
"email":{
S: aws.String(email),
},
},
TableName: aws.String(tableName),
}
_,err := dynaClient.DeleteItem(input)
if err != nil {
return errors.New(ErrorCouldNotDeleteItem)
}
return nil
}