2 files changed, 106 insertions, 0 deletions
diff --git a/internal/client/output/b2.go b/internal/client/output/b2.go
new file mode 100644
index 0000000..3c8b53c
--- /dev/null
+++ b/internal/client/output/b2.go
@@ -0,0 +1,95 @@
+package output
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/Backblaze/blazer/b2"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
+)
+
+var _ OutputClient = (*B2OutputClient)(nil)
+
+type B2OutputClient struct {
+	prefix string
+	bucket *b2.Bucket
+	b2cl   *b2.Client
+}
+
+func NewB2OutputClient(cfg *config.OutputConfig) (*B2OutputClient, error) {
+	if cfg.Storage.Type != "b2" {
+		return nil, fmt.Errorf("invalid storage type for B2OutputClient")
+	}
+	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 &B2OutputClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix}, nil
+}
+
+func (c *B2OutputClient) GetWriter(path string) (io.Writer, error) {
+	obj := c.bucket.Object(c.prefix + path)
+	if obj == nil {
+		return nil, fmt.Errorf("failed to reference object in B2 bucket")
+	}
+
+	return obj.NewWriter(context.Background()), nil
+}
+
+func (c *B2OutputClient) ReadMetadata(path string) (map[string]string, error) {
+	obj := c.bucket.Object(c.prefix + path)
+	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)
+	}
+
+	metadata := attrs.Info
+	metadata["Name"] = attrs.Name
+	metadata["Size"] = fmt.Sprintf("%d", attrs.Size)
+	metadata["ContentType"] = attrs.ContentType
+	metadata["LastModified"] = attrs.LastModified.Format("2006-01-02T15:04:05Z")
+	metadata["SHA1"] = attrs.SHA1
+	metadata["UploadTimestamp"] = attrs.UploadTimestamp.Format("2006-01-02T15:04:05Z")
+
+	switch attrs.Status {
+	case b2.Uploaded:
+		metadata["Status"] = "Uploaded"
+	case b2.Folder:
+		metadata["Status"] = "Folder"
+	case b2.Hider:
+		metadata["Status"] = "Hider"
+	case b2.Started:
+		metadata["Status"] = "Started"
+	default:
+		metadata["Status"] = "Unknown"
+	}
+
+	return metadata, nil
+}
+
+func (c *B2OutputClient) IsMissing(path string) (bool, error) {
+	obj := c.bucket.Object(c.prefix + path)
+	if obj == nil {
+		return false, fmt.Errorf("failed to reference object in B2 bucket")
+	}
+
+	attrs, err := obj.Attrs(context.Background())
+	if err != nil {
+		return true, fmt.Errorf("get attributes for object: %w", err)
+	}
+
+	return attrs.Status == b2.Hider, nil
+}
diff --git a/internal/client/output/output_client_interface.go b/internal/client/output/output_client_interface.go
new file mode 100644
index 0000000..5271e18
--- /dev/null
+++ b/internal/client/output/output_client_interface.go
@@ -0,0 +1,11 @@
+package output
+
+import (
+	"io"
+)
+
+type OutputClient interface {
+	GetWriter(path string) (io.Writer, error)
+	ReadMetadata(string) (map[string]string, error)
+	IsMissing(path string) (bool, error)
+}