1 files changed, 82 insertions, 28 deletions

diff --git a/internal/storage/b2.go b/internal/storage/b2.go
index 6697023..0d92707 100644
--- a/internal/storage/b2.go
+++ b/internal/storage/b2.go
@@ -3,6 +3,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"io"
 	"strconv"
 	"strings"
 	"time"
@@ -39,22 +40,63 @@ func NewB2StorageClient(cfg *config.StorageConfig) (StorageClient, error) {
 	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)
+func (sc *B2StorageClient) Scan() ([]string, error) {
+	filePaths := []string{}
+
+	iter := sc.bucket.List(context.Background(), b2.ListPrefix(sc.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
+		}
+
+		if !strings.HasSuffix(obj.Name(), ".md") {
+			continue
+		}
+
+		filePaths = append(filePaths, strings.TrimPrefix(obj.Name(), sc.prefix))
+	}
+
+	if err := iter.Err(); err != nil {
+		return nil, fmt.Errorf("iterate over B2 objects: %w", err)
+	}
+
+	return filePaths, nil
+}
+
+func (sc *B2StorageClient) GetReader(path string) (io.ReadCloser, int64, error) {
+	obj := sc.bucket.Object(sc.prefix + path)
 	if obj == nil {
-		return nil, fmt.Errorf("failed to reference object in B2 bucket")
+		return nil, 0, 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 nil, 0, fmt.Errorf("error getting attributes of an object: %w", err)
 	}
-	return attrs.Info, nil
+
+	return obj.NewReader(context.Background()), attrs.Size, nil
 }
 
-func (sc *B2StorageClient) Put(key string, content []byte, metadata *frontmatter.Metadata) error {
+func (sc *B2StorageClient) WriteMetadata(path string, metadata *frontmatter.Metadata) error {
+	obj := sc.bucket.Object(sc.prefix + path)
+	if obj == nil {
+		return fmt.Errorf("failed to reference object in B2 bucket")
+	}
+	oldAttrs, err := obj.Attrs(context.Background())
+	if err != nil {
+		return fmt.Errorf("error getting attributes of an object: %w", err)
+	}
+
 	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")
@@ -73,30 +115,27 @@ func (sc *B2StorageClient) Put(key string, content []byte, metadata *frontmatter
 		}
 	}
 
-	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,
+			"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,
+			"timezone":                  metadata.Timezone,
+			"metadata-last-update-sha1": oldAttrs.SHA1,
 		}}
 
-	prod := sc.bucket.Object(sc.prefix + key)
-	if prod == nil {
-		return fmt.Errorf("failed to reference prod object in B2 bucket")
+	reader := obj.NewReader(context.Background())
+	content := make([]byte, oldAttrs.Size)
+	if _, err = reader.Read(content); err != nil {
+		return fmt.Errorf("failed to read an object back for writing (required for attribute setting): %w", err)
 	}
 
-	writer := prod.NewWriter(context.Background(), b2.WithAttrsOption(attrs))
+	writer := obj.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)
@@ -105,6 +144,21 @@ func (sc *B2StorageClient) Put(key string, content []byte, metadata *frontmatter
 	return nil
 }
 
-func (sc *B2StorageClient) BuildIndex() error {
-	return fmt.Errorf("BuildIndex not implemented for B2 storage")
+func (sc *B2StorageClient) FileHasChanged(path string) bool {
+	obj := sc.bucket.Object(sc.prefix + path)
+	if obj == nil {
+		return true
+	}
+
+	attrs, err := obj.Attrs(context.Background())
+	if err != nil {
+		return true
+	}
+
+	lastUpdateSha1, ok := attrs.Info["metadata-last-update-sha1"]
+	if !ok {
+		return true
+	}
+
+	return attrs.SHA1 == lastUpdateSha1
 }