Base64 encoded data is not uploading as PNG image in AWS s3 bucket in GO-CodePudding

I am trying to upload base64 encoded string to aws s3 bucket in the form of PNG image. I had tried following code:


import (
    awsconfig "github.com/aws/aws-sdk-go-v2/config"
    "github.com/aws/aws-sdk-go-v2/feature/s3/manager"
    "github.com/aws/aws-sdk-go-v2/service/s3"
)
signature:= "iVBORw0KGgoAAAANSUhEUgAAAfQAAAC0CAYAAABi d5SAAAAAXNSR0IArs4c6QAAHANJREFUeF7tnWusdkdZhm kVUSxYg 2klirFWMrrdD wPKjEg QCtQayw8PqYApQUPaRhJDhBQUEyJqDyHGeihtQI1oLI02WklBYrWgrWBaRKxQEKgoLWjVWA5ac/utRd9v9333embeWWvNrHVNsrP39 1nZs1cM   1zwz88zjRIIABCAAAQhAoHkCj2u BTQAAhCAAAQgAAEh6AwCCEAAAhCAwAIIIOgL6ESaAAEIQAACEEDQGQMQgAAEIACBBRBA0BfQiTQBAhCAAAQggKAzBiAAAQhAAAILIICgL6ATaQIEIAABCEAAQWcMQAACEIAABBZAAEFfQCfSBAhAAAIQgACCzhiAAAQgAAEILIAAgr6ATqQJEIAABCAAAQSdMQABCEAAAhBYAAEEvb1O/HZJx0n6zq7q/vdXdz/7u7  YaNZ/ybJX04Hvx9svfMeL mzkh6W9MABgz T9GFJ90u6rT101BgCEIDAcgkg6PX2rcX17E64LdoWaX vIT0i6c8lvUbSO2uoEHWAAAQgsHYCCHo9I D8TrA98 4FvJ7a7a7J6yS9uoWKUkcIQAACSyaAoM/Tu559P0fSj0k6uaKZdy6NmyT9QG5m8kEAAhCAwP4EEPT9GUZK2HSff/8CBHxbm6 RdHkEBjYQgAAEIFCeAIJenmlfol3oFu/ehT7ek op XRJH6qnOtQEAhCAwHoIIOhl 9pr35d0rvR 53nZJ9Rd2lsk/WjdVaR2EIAABJZJAEHfv18t3BZxu5s3j4vtX3J7JTzUHalrr bUGAIQgEDjBBD0/A60kF/WCfkaZ O7yPko22vzsZITAhCAAARyCCDoOdSOzMgtXGufkW jd4ek8/KwkgsCEIAABHIJIOhp5Czgb9qI0paWu4z1u7qIb /b O6SHQXO/xdNm9HlNvO4jR V9BFJZ0g6qfvlyyVdFCz8BEkPBm0xgwAEIACBAgQQ9DhEu9c9K5/SvW7xtkg75KoFNkWw4y2LWZ4j6c6YqZ7d1TlojhkEIAABCOxLAEEfJmgBd CUPnb6cI48C8dOv7UTQgv4nOK9qwXXSvJMfSg5YM6NQ0b8HgIQgAAEyhFA0A9n6XPkdrGPMSu3W9vCfY kd0u6vVy3jlaSPRRXBkr3pjjbkiAAAQhAYCICCPp20BZwC1fJyGf/LultGzNwu9BbSwh6az1GfSEAgdUQQNAf29UODuNZeYmbzTwLt4jfUKkLPXWgI ipxLCHAAQgMBEBBP1o0F4jfpmkY/bkf7Okqxe4MeyqoNfiiq79e2IkOwQgAAEIRAkg6EdI2cXuTVwviILbYecyPItt0Z0eabrvPo9sDmSXe4QmNhCAAAQKEkDQjwSH8S72fVzsPl7m9fYad6YXHC56b5DTWZLuLvlgyoIABCAAgcMJrF3QPdu0mOfuYvdGN8/I7V5fQ7pf0imBhq59XAUQYQIBCECgLIE1/ H1WWlvfstNf9tdj7pU9/o2Lo8EYH1qI7pcwBwTCEAAAhAoQWCtgr6vmK/1nHVE0D0u1zquSnwmKQMCEIBAFoE1/uH1Wrd3a cku9gdbMYBYdaYIoLOFaprHBm0GQIQmJ3A2gR9n5n52yW9sLsEZfaOm6kCX5D0 IFn/6ekJ81UPx4LAQhAYLUE1iTo3gDnY1c56Xck/VBOxoXliczQ/1vSExfWbpoDAQhAoHoCaxF072K/L2M3 yckPW8Fx9GiAzUi6C5rLeMqyg07CEAAAqMTWMsfXodfvTCRpnexe1bve8ZJRwgg6IwECEAAApUSWIOg56ybO Kb85GOJhANLHPagqPlMSYgAAEIVElg6YLuKHAWoZTAMYj57qEaDf16rqS7qhzxVAoCEIDAQgksXdBTXe2I eED3YF4Ip6L50v6o4V 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decodedSignature, decodeErr := base64.StdEncoding.DecodeString(signature)
if decodeErr != nil {
    // handle error here
}
r := bytes.NewReader(decodedSignature)

bucketName := "test"
filepath := "uploads"
contentType := "image/png"
cfg, err := awsconfig.LoadDefaultConfig(context.TODO(),
    awsconfig.WithRegion(config.AwsRegion),
)
client := s3.NewFromConfig(cfg)

// Create an uploader with the client and options
uploader := manager.NewUploader(client)
cacheExpireTime := time.Now().AddDate(1, 0, 0)
cacheMaxAgeSecs := "31556926" // seconds in 1 year

// Upload the file to S3.
uploadResp, err := uploader.Upload(context.TODO(), &s3.PutObjectInput{
    Bucket:       aws.String(bucketName),
    Key:          aws.String(filePath),
    Body:         r,
    ContentType:  aws.String(contentType),
    Expires:      &cacheExpireTime,
    CacheControl: aws.String(cacheMaxAgeSecs),
})

But when I try to load the s3 url on which the image is uploaded, then there is black screen as shown in the screenshot:

CodePudding user response：

The Body parameter in the uploader.Upload function accepts io.Reader objects as body, meaning that you either need to use os.Open to open a png you have saved, or in this case, use bytes.NewReader(data) to make your data conform to the io.Reader interface (have the .Read() method).

CodePudding user response：

Your code is correct and there is no problem with it. but you must add mime type to your base64.

When you create a file with this data and storing with the.png extension. the OS knows the mime type. but when you store this data without extension os don't know which type is it. the same as os you should upload the file with extension or add mime type to the base64 to AWS know about the file type.

so I suggest you add mime type like this:

```
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```