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package output
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log/slog"
"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"
"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
)
var _ OutputClient = (*S3OutputClient)(nil)
type S3OutputClient struct {
prefix string
bucketName string
s3cl *s3.Client
}
func NewS3OutputClient(cfg *config.OutputConfig) (OutputClient, error) {
if cfg.Storage.Type != "s3" {
return nil, fmt.Errorf("invalid storage type for S3OutputClient")
}
s3cfg := cfg.Storage.Config.(*config.S3Config)
s3cl, err := newS3Client(s3cfg)
if err != nil {
return nil, fmt.Errorf("create S3 client: %w", err)
}
return &S3OutputClient{
s3cl: s3cl,
bucketName: s3cfg.BucketName,
prefix: s3cfg.Prefix,
}, nil
}
func (c *S3OutputClient) GetWriter(path string, inputMetadata *input.MetadataStruct, outputContentType string) (io.WriteCloser, error) {
key := c.prefix + path
return &s3WriteCloser{
key: key,
bucketName: c.bucketName,
s3cl: c.s3cl,
contentType: outputContentType,
hashOriginal: inputMetadata.Hash,
buf: &bytes.Buffer{},
}, nil
}
func (c *S3OutputClient) 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), "\""),
HashOriginal: head.Metadata["sha1-original"],
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 *S3OutputClient) IsMissing(path string) bool {
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 true
}
headJson, _ := json.Marshal(head)
slog.Debug("got object attrs", slog.String("path", path), slog.String("attrs", string(headJson)))
if head.ContentLength == nil || *head.ContentLength == 0 {
return true
}
return false
}
// s3WriteCloser buffers writes and uploads to S3 on Close.
type s3WriteCloser struct {
key string
bucketName string
s3cl *s3.Client
contentType string
hashOriginal string
buf *bytes.Buffer
}
func (w *s3WriteCloser) Write(p []byte) (int, error) {
return w.buf.Write(p)
}
func (w *s3WriteCloser) Close() error {
_, err := w.s3cl.PutObject(context.Background(), &s3.PutObjectInput{
Bucket: aws.String(w.bucketName),
Key: aws.String(w.key),
Body: bytes.NewReader(w.buf.Bytes()),
ContentType: aws.String(w.contentType),
Metadata: map[string]string{
"sha1-original": w.hashOriginal,
},
})
if err != nil {
return fmt.Errorf("put S3 object %s: %w", w.key, err)
}
return 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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