public APIGatewayProxyResponse GenPresignedURLHandler(APIGatewayProxyRequest request)
{
var requestValidator = new GetUrlRequestValidator();
var requestValidatorResult = requestValidator.Validate(request);
LambdaLogger.Log("Request validation response: " + requestValidatorResult.IsValid);
// validate request
if (!requestValidatorResult.IsValid)
{
var badRequestResponse = new APIGatewayProxyResponse
{
StatusCode = 400,
Body = JsonConvert.SerializeObject(requestValidatorResult.Errors),
Headers = new Dictionary <string, string>
{
{ "Content-Type", "application/json" },
{ "Access-Control-Allow-Origin", "*" }
}
};
LambdaLogger.Log(JsonConvert.SerializeObject(requestValidatorResult.Errors));
return(badRequestResponse);
}
LambdaLogger.Log("Input filename: " + request.QueryStringParameters["fileName"]);
//create S3 bucket information model class
var bucketInfo = new S3LookupModel(request.QueryStringParameters["bucketName"],
request.QueryStringParameters["objectPath"],
request.QueryStringParameters["region"],
request.QueryStringParameters["fileName"],
Amazon.S3.HttpVerb.GET);
//generate pre-signed URL
GeneratePreSignedUrl generatePresignedUrl = new GeneratePreSignedUrl(bucketInfo);
var response = new APIGatewayProxyResponse
{
StatusCode = 200,
Body = JsonConvert.SerializeObject(new ResponseBoundary
{
PresignedUrl = generatePresignedUrl.GenerateURL(),
Bucket = bucketInfo.BucketName,
ObjectKey = bucketInfo.ObjectKey,
Region = bucketInfo.RegionEndpoint,
Expiry = DateTime.Now.AddHours(2).ToString() //I am adding 2 hours for the JSON response to say the correct time as AWS has an ongoing issue of working with GMT+00 which does not take into consideration daylight saving hours.
}),
Headers = new Dictionary <string, string>
{
{ "Content-Type", "application/json" },
{ "Access-Control-Allow-Origin", "*" }
}
};
return(response);
}
public GeneratePreSignedUrl(S3LookupModel _bucketInfo)
{
bucketInfo = _bucketInfo;
s3Client = new AmazonS3Client(RegionEndpoint.GetBySystemName(bucketInfo.RegionEndpoint));
}
