1 files changed, 110 insertions, 0 deletions
diff --git a/internal/storage/b2.go b/internal/storage/b2.go
new file mode 100644
index 0000000..6697023
--- /dev/null
+++ b/internal/storage/b2.go
@@ -0,0 +1,110 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/Backblaze/blazer/b2"
+	"github.com/SayaAndy/saya-today-article-metadata-add/config"
+	"github.com/SayaAndy/saya-today-article-metadata-add/internal/frontmatter"
+)
+
+var _ StorageClient = &B2StorageClient{}
+
+type B2StorageClient struct {
+	prefix string
+	bucket *b2.Bucket
+	b2cl   *b2.Client
+}
+
+func NewB2StorageClient(cfg *config.StorageConfig) (StorageClient, error) {
+	if cfg.Type != "b2" {
+		return nil, fmt.Errorf("invalid storage type for B2InputClient")
+	}
+	b2cfg := cfg.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 &B2StorageClient{b2cl: b2cl, bucket: bucket, prefix: b2cfg.Prefix}, nil
+}
+
+func (sc *B2StorageClient) GetMetadata(key string) (map[string]string, error) {
+	obj := sc.bucket.Object(sc.prefix + key)
+	if obj == nil {
+		return nil, fmt.Errorf("failed to reference object in B2 bucket")
+	}
+	attrs, err := obj.Attrs(context.Background())
+	if err != nil {
+		if b2.IsNotExist(err) {
+			return map[string]string{}, nil
+		}
+		return nil, fmt.Errorf("get attributes of B2 object %q: %w", sc.prefix+key, err)
+	}
+	return attrs.Info, nil
+}
+
+func (sc *B2StorageClient) Put(key string, content []byte, metadata *frontmatter.Metadata) error {
+	geolocationParts := strings.Split(metadata.Geolocation, " ")
+	if (len(geolocationParts) == 1 && geolocationParts[0] != "") || len(geolocationParts) >= 4 {
+		return fmt.Errorf("invalid geolocation format, expecting '{x} {y} [areaError]' or an empty string")
+	}
+	if len(geolocationParts) >= 2 {
+		if _, err := strconv.ParseFloat(geolocationParts[0], 64); err != nil {
+			return fmt.Errorf("invalid geolocation parameter, expected float for X: %w", err)
+		}
+		if _, err := strconv.ParseFloat(geolocationParts[1], 64); err != nil {
+			return fmt.Errorf("invalid geolocation parameter, expected float for Y: %w", err)
+		}
+	}
+	if len(geolocationParts) == 3 {
+		if _, err := strconv.ParseFloat(geolocationParts[2], 64); err != nil {
+			return fmt.Errorf("invalid geolocation parameter, expected float for area error: %w", err)
+		}
+	}
+
+	medley := ""
+	if metadata.Medley != "" {
+		medley = fmt.Sprintf("%s %d", metadata.Medley, metadata.MedleyPart)
+	}
+
+	attrs := &b2.Attrs{
+		ContentType: "text/markdown; charset=utf-8",
+		Info: map[string]string{
+			"title":             metadata.Title,
+			"short-description": metadata.ShortDescription,
+			"action-date":       metadata.ActionDate,
+			"published-time":    metadata.PublishedTime.Format(time.RFC3339),
+			"thumbnail":         metadata.Thumbnail,
+			"tags":              strings.Join(metadata.Tags, ","),
+			"geolocation":       metadata.Geolocation,
+			"medley":            medley,
+		}}
+
+	prod := sc.bucket.Object(sc.prefix + key)
+	if prod == nil {
+		return fmt.Errorf("failed to reference prod object in B2 bucket")
+	}
+
+	writer := prod.NewWriter(context.Background(), b2.WithAttrsOption(attrs))
+	defer writer.Close()
+	if _, err := writer.Write(content); err != nil {
+		return fmt.Errorf("failed to write an object back after attribute settings: %w", err)
+	}
+
+	return nil
+}
+
+func (sc *B2StorageClient) BuildIndex() error {
+	return fmt.Errorf("BuildIndex not implemented for B2 storage")
+}