chenhg5/cc-connect · error

slack: send file: %w

Error message

slack: send file: %w

What it means

Wrapped error from slack-go UploadFileV2Context when uploading and posting a generic file attachment to the reply channel/thread; the Slack file upload flow failed.

Source

Thrown at platform/slack/slack.go:555

	rc, ok := rctx.(replyContext)
	if !ok {
		return fmt.Errorf("slack: SendFile: invalid reply context type %T", rctx)
	}

	name := file.FileName
	if name == "" {
		name = "attachment"
	}

	_, err := p.client.UploadFileV2Context(ctx, slack.UploadFileV2Parameters{
		Reader:          bytes.NewReader(file.Data),
		FileSize:        len(file.Data),
		Filename:        name,
		Channel:         rc.channel,
		ThreadTimestamp: rc.timestamp,
	})
	if err != nil {
		return fmt.Errorf("slack: send file: %w", err)
	}
	return nil
}

var _ core.FileSender = (*Platform)(nil)

func (p *Platform) downloadSlackFile(url string) ([]byte, error) {
	if url == "" {
		return nil, fmt.Errorf("empty URL")
	}
	req, _ := http.NewRequest("GET", url, nil)
	req.Header.Set("Authorization", "Bearer "+p.botToken)
	resp, err := core.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("%s", core.RedactToken(err.Error(), p.botToken))
	}
	defer resp.Body.Close()

View on GitHub (pinned to 4000b2338a)

Solutions

1. Check files:write scope and file size limits
2. Retry transient network errors

When it happens

Trigger: Thrown at platform/slack/slack.go:555 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/8cd61fbab016ab7b. Report an issue: GitHub.