import (
"context"
"fmt"
"io"
"time"
"cloud.google.com/go/storage"
)
// getMetadata prints all of the object attributes.
func getMetadata(w io.Writer, bucket, object string) (*storage.ObjectAttrs, error) {
// bucket := "bucket-name"
// object := "object-name"
ctx := context.Background()
client, err := storage.NewClient(ctx)
if err != nil {
return nil, fmt.Errorf("storage.NewClient: %w", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(ctx, time.Second*10)
defer cancel()
o := client.Bucket(bucket).Object(object)
attrs, err := o.Attrs(ctx)
if err != nil {
return nil, fmt.Errorf("Object(%q).Attrs: %w", object, err)
}
fmt.Fprintf(w, "Bucket: %v\n", attrs.Bucket)
fmt.Fprintf(w, "CacheControl: %v\n", attrs.CacheControl)
fmt.Fprintf(w, "ContentDisposition: %v\n", attrs.ContentDisposition)
fmt.Fprintf(w, "ContentEncoding: %v\n", attrs.ContentEncoding)
fmt.Fprintf(w, "ContentLanguage: %v\n", attrs.ContentLanguage)
fmt.Fprintf(w, "ContentType: %v\n", attrs.ContentType)
fmt.Fprintf(w, "Crc32c: %v\n", attrs.CRC32C)
fmt.Fprintf(w, "Generation: %v\n", attrs.Generation)
fmt.Fprintf(w, "KmsKeyName: %v\n", attrs.KMSKeyName)
fmt.Fprintf(w, "Md5Hash: %v\n", attrs.MD5)
fmt.Fprintf(w, "MediaLink: %v\n", attrs.MediaLink)
fmt.Fprintf(w, "Metageneration: %v\n", attrs.Metageneration)
fmt.Fprintf(w, "Name: %v\n", attrs.Name)
fmt.Fprintf(w, "Size: %v\n", attrs.Size)
fmt.Fprintf(w, "StorageClass: %v\n", attrs.StorageClass)
fmt.Fprintf(w, "TimeCreated: %v\n", attrs.Created)
fmt.Fprintf(w, "Updated: %v\n", attrs.Updated)
fmt.Fprintf(w, "Event-based hold enabled? %t\n", attrs.EventBasedHold)
fmt.Fprintf(w, "Temporary hold enabled? %t\n", attrs.TemporaryHold)
fmt.Fprintf(w, "Retention expiration time %v\n", attrs.RetentionExpirationTime)
fmt.Fprintf(w, "Custom time %v\n", attrs.CustomTime)
fmt.Fprintf(w, "Retention: %+v\n", attrs.Retention)
fmt.Fprintf(w, "\n\nMetadata\n")
for key, value := range attrs.Metadata {
fmt.Fprintf(w, "\t%v = %v\n", key, value)
}
return attrs, nil
}
