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package input
import (
"context"
"fmt"
"io"
"slices"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
awsconfig "github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/credentials"
"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/SayaAndy/saya-today-thumbnail-generator/config"
)
var _ InputClient = (*S3InputClient)(nil)
type S3InputClient struct {
prefix string
bucketName string
s3cl *s3.Client
knownExtensions []string
}
func NewS3InputClient(cfg *config.InputConfig) (InputClient, error) {
if cfg.Storage.Type != "s3" {
return nil, fmt.Errorf("invalid storage type for S3InputClient")
}
s3cfg := cfg.Storage.Config.(*config.S3Config)
s3cl, err := newS3Client(s3cfg)
if err != nil {
return nil, fmt.Errorf("create S3 client: %w", err)
}
return &S3InputClient{
s3cl: s3cl,
bucketName: s3cfg.BucketName,
prefix: s3cfg.Prefix,
knownExtensions: cfg.KnownExtensions,
}, nil
}
func (c *S3InputClient) Scan() ([]string, error) {
var filePaths []string
paginator := s3.NewListObjectsV2Paginator(c.s3cl, &s3.ListObjectsV2Input{
Bucket: aws.String(c.bucketName),
Prefix: aws.String(c.prefix),
})
for paginator.HasMorePages() {
output, err := paginator.NextPage(context.Background())
if err != nil {
return nil, fmt.Errorf("list S3 objects: %w", err)
}
for _, obj := range output.Contents {
name := aws.ToString(obj.Key)
if len(c.knownExtensions) != 0 {
nameParts := strings.Split(name, ".")
if len(nameParts) < 2 {
continue
}
ext := strings.ToLower(nameParts[len(nameParts)-1])
if !slices.Contains(c.knownExtensions, ext) {
continue
}
}
filePaths = append(filePaths, strings.TrimPrefix(name, c.prefix))
}
}
return filePaths, nil
}
func (c *S3InputClient) ReadMetadata(path string) (*MetadataStruct, error) {
key := c.prefix + path
head, err := c.s3cl.HeadObject(context.Background(), &s3.HeadObjectInput{
Bucket: aws.String(c.bucketName),
Key: aws.String(key),
})
if err != nil {
return nil, fmt.Errorf("head S3 object %s: %w", key, err)
}
metadata := MetadataStruct{
Name: key,
StorageType: "s3",
Hash: strings.Trim(aws.ToString(head.ETag), "\""),
ContentType: aws.ToString(head.ContentType),
Misc: head.Metadata,
}
if head.ContentLength != nil {
metadata.Size = *head.ContentLength
}
if head.LastModified != nil {
metadata.LastModified = *head.LastModified
metadata.FirstCreated = *head.LastModified
}
return &metadata, nil
}
func (c *S3InputClient) ID(path string) string {
return fmt.Sprintf("s3://%s/%s%s", c.bucketName, c.prefix, path)
}
func (c *S3InputClient) GetReader(path string) (io.ReadCloser, error) {
key := c.prefix + path
output, err := c.s3cl.GetObject(context.Background(), &s3.GetObjectInput{
Bucket: aws.String(c.bucketName),
Key: aws.String(key),
})
if err != nil {
return nil, fmt.Errorf("get S3 object %s: %w", key, err)
}
return output.Body, nil
}
func newS3Client(cfg *config.S3Config) (*s3.Client, error) {
opts := []func(*awsconfig.LoadOptions) error{
awsconfig.WithRegion(cfg.Region),
}
if cfg.AccessKeyID != "" && cfg.SecretAccessKey != "" {
opts = append(opts, awsconfig.WithCredentialsProvider(
credentials.NewStaticCredentialsProvider(cfg.AccessKeyID, cfg.SecretAccessKey, ""),
))
}
awsCfg, err := awsconfig.LoadDefaultConfig(context.Background(), opts...)
if err != nil {
return nil, fmt.Errorf("load AWS config: %w", err)
}
var s3Opts []func(*s3.Options)
if cfg.Endpoint != "" {
s3Opts = append(s3Opts, func(o *s3.Options) {
o.BaseEndpoint = aws.String(cfg.Endpoint)
})
}
s3Opts = append(s3Opts, func(o *s3.Options) {
o.UsePathStyle = cfg.UsePathStyle
})
return s3.NewFromConfig(awsCfg, s3Opts...), nil
}
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