[BUG] Mixed content error when previewing PDF

[YueMiyuki]

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OpenList Version (required)

4.1.9

Storage Driver Used (required)

Local, sftp

Bug Description (required)

PDF.js failed to preview because $e_url is resolved with http protocol, resulting in Mixed content error, and the PDF in preview is blank.

Probably related to:

OpenList/server/common/base.go

Lines 13 to 31 in 0c46199

	func GetApiUrlFromRequest(r *http.Request) string {
	api := conf.Conf.SiteURL
	if strings.HasPrefix(api, "http") {
	return strings.TrimSuffix(api, "/")
	}
	if r != nil {
	protocol := "http"
	if r.TLS != nil || r.Header.Get("X-Forwarded-Proto") == "https" {
	protocol = "https"
	}
	host := r.Header.Get("X-Forwarded-Host")
	if host == "" {
	host = r.Host
	}
	api = fmt.Sprintf("%s://%s", protocol, stdpath.Join(host, api))
	}
	api = strings.TrimSuffix(api, "/")
	return api
	}

Especially when user is running OpenList in docker.

Setting SiteURL with correct https protocol will fix this, however, this is not mentioned in the OpenList docs (FAQ - Why can't I preview the PDF file). The docs only stated that some features may not work if this is not set, see here.

Logs (required)

Logs are not related in this issue.

Configuration File Content (required)

Configuration file is not related in this issue.

Reproduction Link (optional)

This issue can be reproduced with any PDF file, extracting the PDF.js viewer and open it in a browser have the same behavior. Replace http with https will render the PDF correctly.

[github-actions]

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