add nipb0/blossom helpers.

nipb0/blossom/upload.go

@@ -0,0 +1,50 @@
+package blossom
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"mime"
+	"os"
+	"path/filepath"
+
+	"github.com/nbd-wtf/go-nostr"
+)
+
+// UploadFile uploads a file to the media server
+func (c *Client) UploadFile(ctx context.Context, filePath string) (*BlobDescriptor, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open %s: %w", filePath, err)
+	}
+	defer file.Close()
+
+	sha := sha256.New()
+	size, err := io.Copy(sha, file)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read %s: %w", filePath, err)
+	}
+	hash := sha.Sum(nil)
+
+	_, err = file.Seek(0, 0)
+	if err != nil {
+		return nil, fmt.Errorf("failed to reset file position: %w", err)
+	}
+
+	contentType := mime.TypeByExtension(filepath.Ext(filePath))
+
+	bd := BlobDescriptor{}
+	err = c.httpCall(ctx, "PUT", c.mediaserver+"/upload", contentType, func() string {
+		return c.authorizationHeader(ctx, func(evt *nostr.Event) {
+			evt.Tags = append(evt.Tags, nostr.Tag{"t", "upload"})
+			evt.Tags = append(evt.Tags, nostr.Tag{"x", hex.EncodeToString(hash[:])})
+		})
+	}, file, size, &bd)
+	if err != nil {
+		return nil, fmt.Errorf("failed to upload %s: %w", filePath, err)
+	}
+
+	return &bd, nil
+}