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Generate a Presigned URL and Upload an Object

Pragya Keshap answered on February 13, 2023 Popularity 5/10 Helpfulness 1/10

answer Generate a Presigned URL and Upload an Object

Generate a Presigned URL and Upload an Object

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    public static void signBucket(S3Presigner presigner, String bucketName, String keyName) {

        try {
            Map<String, String> metadata = new HashMap<>();
            metadata.put("author","Mary Doe");
            metadata.put("version","1.0.0.0");

            PutObjectRequest objectRequest = PutObjectRequest.builder()
                .bucket(bucketName)
                .key(keyName)
                .contentType("text/plain")
                .metadata(metadata)
                .build();

            PutObjectPresignRequest presignRequest = PutObjectPresignRequest.builder()
                .signatureDuration(Duration.ofMinutes(10))
                .putObjectRequest(objectRequest)
                .build();

            PresignedPutObjectRequest presignedRequest = presigner.presignPutObject(presignRequest);
            System.out.println("Presigned URL to upload a file to: " + presignedRequest.url());
            System.out.println("Which HTTP method needs to be used when uploading a file: " + presignedRequest.httpRequest().method());

            // Upload content to the Amazon S3 bucket by using this URL.
            URL url = presignedRequest.url();

            // Create the connection and use it to upload the new object.
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setRequestProperty("Content-Type","text/plain");
            connection.setRequestProperty("x-amz-meta-author","Mary Doe");
            connection.setRequestProperty("x-amz-meta-version","1.0.0.0");
            connection.setRequestMethod("PUT");
            OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
            out.write("This text was uploaded as an object by using a presigned URL.");
            out.close();

            connection.getResponseCode();
            System.out.println("HTTP response code is " + connection.getResponseCode());

        } catch (S3Exception | IOException e) {
            e.getStackTrace();
        }
    }

https://docs.aws.amazon.com/AmazonS3/latest/userguide/PresignedUrlUploadObject.html

Popularity 5/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: generate java object upload

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Contributed on Feb 13 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Generate a Presigned URL and Upload an Object

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