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package input
import (
"context"
"fmt"
"io"
"slices"
"strings"
"github.com/Backblaze/blazer/b2"
"github.com/SayaAndy/saya-today-thumbnail-generator/config"
)
var _ InputClient = (*B2InputClient)(nil)
type B2InputClient struct {
prefix string
bucket *b2.Bucket
bucketName string
b2cl *b2.Client
knownExtensions []string
}
func NewB2InputClient(cfg *config.InputConfig) (InputClient, error) {
if cfg.Storage.Type != "b2" {
return nil, fmt.Errorf("invalid storage type for B2InputClient")
}
b2cfg := cfg.Storage.Config.(*config.B2Config)
b2cl, err := b2.NewClient(context.Background(), b2cfg.KeyID, b2cfg.ApplicationKey)
if err != nil {
return nil, err
}
bucket, err := b2cl.Bucket(context.Background(), b2cfg.BucketName)
if err != nil {
return nil, err
}
return &B2InputClient{b2cl: b2cl, bucket: bucket, bucketName: b2cfg.BucketName, prefix: b2cfg.Prefix, knownExtensions: cfg.KnownExtensions}, nil
}
func (c *B2InputClient) Scan() ([]string, error) {
filePaths := []string{}
iter := c.bucket.List(context.Background(), b2.ListPrefix(c.prefix))
for iter.Next() {
obj := iter.Object()
if obj == nil {
return nil, fmt.Errorf("failed to reference object in B2 bucket")
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return nil, fmt.Errorf("get attributes for object: %w", err)
}
if attrs.Status != b2.Uploaded {
continue
}
name := obj.Name()
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))
}
if err := iter.Err(); err != nil {
return nil, fmt.Errorf("iterate over B2 objects: %w", err)
}
return filePaths, nil
}
func (c *B2InputClient) ReadMetadata(path string) (*MetadataStruct, error) {
obj := c.bucket.Object(c.prefix + path)
if obj == nil {
return nil, fmt.Errorf("object not found in B2 bucket")
}
attrs, err := obj.Attrs(context.Background())
if err != nil {
return nil, fmt.Errorf("get attributes for object: %w", err)
}
metadata := MetadataStruct{
Name: attrs.Name,
StorageType: "b2",
Hash: attrs.SHA1,
ContentType: attrs.ContentType,
FirstCreated: attrs.UploadTimestamp,
LastModified: attrs.LastModified,
Misc: attrs.Info,
Size: attrs.Size,
}
switch attrs.Status {
case b2.Uploaded:
metadata.Misc["b2-status"] = "Uploaded"
case b2.Folder:
metadata.Misc["b2-status"] = "Folder"
case b2.Hider:
metadata.Misc["b2-status"] = "Hider"
case b2.Started:
metadata.Misc["b2-status"] = "Started"
default:
metadata.Misc["b2-status"] = "Unknown"
}
return &metadata, nil
}
func (c *B2InputClient) ID(path string) string {
return fmt.Sprintf("b2://%s/%s%s", c.bucketName, c.prefix, path)
}
func (c *B2InputClient) GetReader(path string) (io.ReadCloser, error) {
obj := c.bucket.Object(c.prefix + path)
if obj == nil {
return nil, fmt.Errorf("failed to reference object in B2 bucket")
}
return obj.NewReader(context.Background()), nil
}
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