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dynamo.go
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dynamo.go
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package main
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
"github.com/google/uuid"
"golang.org/x/oauth2"
)
type DynamoDbClient struct {
inner *dynamodb.Client
}
func (i DynamoDbClient) PutToken(userExId string, token *oauth2.Token) error {
t, err := json.Marshal(token)
if err != nil {
return err
}
item := map[string]types.AttributeValue{
"ID": &types.AttributeValueMemberS{Value: uuid.New().String()},
"UserExId": &types.AttributeValueMemberS{Value: userExId},
"Tokens": &types.AttributeValueMemberS{Value: string(t)},
}
_, err = i.inner.PutItem(context.TODO(), &dynamodb.PutItemInput{
TableName: aws.String(DynamoDbTableName),
Item: item,
})
if err != nil {
return err
}
return nil
}
func (i DynamoDbClient) FetchToken(userExId string) (*oauth2.Token, error) {
key := map[string]types.AttributeValue{
"UserExId": &types.AttributeValueMemberS{Value: userExId},
}
output, err := i.inner.GetItem(context.TODO(), &dynamodb.GetItemInput{Key: key, TableName: aws.String(DynamoDbTableName)})
if err != nil {
return nil, err
}
var record DynamoDbUserExIdTokens
if len(output.Item) == 0 {
return nil, fmt.Errorf("no such userExId: %v", userExId)
}
err = attributevalue.UnmarshalMap(output.Item, &record)
if err != nil {
return nil, err
}
token, err := parseGoogleToken(record.Tokens)
if err != nil {
return nil, err
}
return token, nil
}
func parseGoogleToken(j string) (*oauth2.Token, error) {
var t *oauth2.Token
err := json.Unmarshal([]byte(j), &t)
if err != nil {
return nil, err
}
return t, nil
}
func IsNotSuchKeyError(err error) bool {
return strings.HasPrefix(err.Error(), "no such userExId:")
}