s3_demo/S3Demo/Helper/ObjectHelper.cs

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX - License - Identifier: Apache - 2.0

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Amazon;
using Amazon.Runtime;
using Amazon.S3;
using Amazon.S3.Model;

namespace S3Demo.Helper
{
    class ObjectHelper
    {
        #region 上传对象(带标签)
        /// <summary>
        /// This method uploads an object with tags. It then shows the tag
        /// values, changes the tags, and shows the new tags.
        /// </summary>
        /// <param name="client">The Initialized Amazon S3 client object used
        /// to call the methods to create and change an objects tags.</param>
        /// <param name="bucketName">A string representing the name of the
        /// bucket where the object will be stored.</param>
        /// <param name="keyName">A string representing the key name of the
        /// object to be tagged.</param>
        /// <param name="filePath">The directory location and file name of the
        /// object to be uploaded to the S3 bucket.</param>
        public static async Task<string> PutObjectsWithTagsAsync(IAmazonS3 client, string bucketName, string keyName, string filePath, string[] tags)
        {
            try
            {
                // Create an object with tags.
                var putRequest = new PutObjectRequest
                {
                    BucketName = bucketName,
                    Key = keyName,
                    FilePath = filePath,
                    TagSet = new List<Tag>
                    {
                        new Tag { Key = "sn", Value = tags[0] },
                        new Tag { Key = "date", Value = tags[1] }
                        //TODO: 后续添加不良代码，接口获取
                        //new Tag { Key = "code", Value = tags[2] }
                    },
                };

                PutObjectResponse response = await client.PutObjectAsync(putRequest);
                //Console.WriteLine(putRequest.Key + "," + putRequest.BucketName + "," + putRequest.FilePath + "," + response.HttpStatusCode);
                return response.HttpStatusCode.ToString();

                #region 查看tag
                //GetObjectTaggingRequest getTagsRequest = new()
                //{
                //    BucketName = bucketName,
                //    Key = keyName,
                //};
                //// 获取对象
                //GetObjectTaggingResponse objectTags = await client.GetObjectTaggingAsync(getTagsRequest);

                //// Display the tag values.
                //objectTags.Tagging
                //    .ForEach(t => Console.WriteLine($"Key: {t.Key}, Value: {t.Value}"));
                #endregion

                #region 替换新Tag(remove)
                //Tagging newTagSet = new()
                //{
                //    TagSet = new List<Tag>
                //    {
                //        new Tag { Key = "Key3", Value = "Value3" },
                //        new Tag { Key = "Key4", Value = "Value4" },
                //    },
                //};

                //PutObjectTaggingRequest putObjTagsRequest = new()
                //{
                //    BucketName = bucketName,
                //    Key = keyName,
                //    Tagging = newTagSet,
                //};

                //PutObjectTaggingResponse response2 = await client.PutObjectTaggingAsync(putObjTagsRequest);

                //// Retrieve the tags again and show the values.
                //GetObjectTaggingRequest getTagsRequest2 = new()
                //{
                //    BucketName = bucketName,
                //    Key = keyName,
                //};
                //GetObjectTaggingResponse objectTags2 = await client.GetObjectTaggingAsync(getTagsRequest2);

                //objectTags2.Tagging
                //    .ForEach(t => Console.WriteLine($"Key: {t.Key}, Value: {t.Value}"));
                #endregion
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
                return ex.Message.ToString();
            }
        }
        #endregion

        #region 查找对象
        public static async Task Readobjectdata(string bucketName, string keyName, BasicAWSCredentials credentials, AmazonS3Config conf)
        {
            //const string bucketName = "doc-example-bucket";
            //const string keyName = "filetodownload";

            // If the Amazon Region where the S3 bucket was created is not
            // the same as the region defined for the default user, specify
            // the region as a parameter to the client constructor.
            // For example: RegionEndpoint.USWest2;
            IAmazonS3 client = new AmazonS3Client(credentials, conf);
            await ReadObjectDataAsync(client, bucketName, keyName);
        }

        /// <summary>
        /// This method copies the contents of the object keyName to another
        /// location, for example, to your local system.
        /// </summary>
        /// <param name="client">The initialize S3 client used to call
        /// GetObjectAsync.</param>
        /// <param name="bucketName">The name of the S3 bucket which contains
        /// the object to copy.</param>
        /// <param name="keyName">The name of the object you want to copy.</param>
        static async Task ReadObjectDataAsync(IAmazonS3 client, string bucketName, string keyName)
        {
            string responseBody = string.Empty;

            try
            {
                GetObjectRequest request = new GetObjectRequest
                {
                    BucketName = bucketName,
                    Key = keyName,
                };
                // Get tag
                GetObjectTaggingRequest getTagsRequest = new()
                {
                    BucketName = bucketName,
                    Key = keyName,
                };
                GetObjectTaggingResponse objectTags = await client.GetObjectTaggingAsync(getTagsRequest);
                // Display the tag values.
                objectTags.Tagging
                    .ForEach(t => Console.WriteLine($"Key: {t.Key}, Value: {t.Value}"));

                using (GetObjectResponse response = await client.GetObjectAsync(request))
                using (Stream responseStream = response.ResponseStream)
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    // Assume you have "title" as medata added to the object.
                    string title = response.Metadata["x-amz-meta-title"];
                    string contentType = response.Headers["Content-Type"];
                    Console.WriteLine($"Object keyName: {response.Key}");
                    Console.WriteLine($"Object metadata, Title: {title}");
                    Console.WriteLine($"Content type: {contentType}");

                    // Retrieve the contents of the file.
                    responseBody = reader.ReadToEnd();

                    // Write the contents of the file to disk.
                    string filePath = $"C:\\Temp\\copy_of_{keyName}";
                }
            }
            catch (AmazonS3Exception e)
            {
                // If the bucket or the object do not exist
                Console.WriteLine($"Error: '{e.Message}'");
            }
        }
        #endregion
    }
}