1 files changed, 113 insertions, 0 deletions
diff --git a/internal/client/output/b2.go b/internal/client/output/b2.go
new file mode 100644
index 0000000..0616368
--- /dev/null
+++ b/internal/client/output/b2.go
@@ -0,0 +1,113 @@
+package output
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+
+	"github.com/Backblaze/blazer/b2"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/config"
+	"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
+)
+
+var _ OutputClient = (*B2OutputClient)(nil)
+
+type B2OutputClient struct {
+	prefix string
+	bucket *b2.Bucket
+	b2cl   *b2.Client
+}
+
+func NewB2OutputClient(cfg *config.OutputConfig) (OutputClient, 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, inputMetadata *input.MetadataStruct, outputContentType string) (io.WriteCloser, error) {
+	obj := c.bucket.Object(c.prefix + path)
+	if obj == nil {
+		return nil, fmt.Errorf("failed to reference object in B2 bucket")
+	}
+
+	attrs := &b2.Attrs{Info: make(map[string]string)}
+	attrs.Info["sha1-original"] = inputMetadata.Hash
+	attrs.ContentType = outputContentType
+
+	return obj.NewWriter(context.Background(), b2.WithAttrsOption(attrs)), nil
+}
+
+func (c *B2OutputClient) ReadMetadata(path string) (*MetadataStruct, 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 := MetadataStruct{
+		Name:         attrs.Name,
+		StorageType:  "b2",
+		Hash:         attrs.SHA1,
+		HashOriginal: attrs.Info["sha1-original"],
+		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 *B2OutputClient) IsMissing(path string) bool {
+	obj := c.bucket.Object(c.prefix + path)
+	if obj == nil {
+		return true
+	}
+
+	attrs, err := obj.Attrs(context.Background())
+	if err != nil {
+		return true
+	}
+
+	attrsJson, _ := json.Marshal(attrs)
+	slog.Debug("got object attrs", slog.String("path", path), slog.String("attrs", string(attrsJson)))
+
+	if attrs.Size == 0 {
+		return true
+	}
+
+	return attrs.Status == b2.Hider
+}