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Further improve readability and maintainability of middleware/secure.go #2800

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Further improve readability and maintainability of middleware/secure.go #2800

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14 changes: 9 additions & 5 deletions middleware/secure.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ package middleware

import (
"fmt"
"strings"

"github.com/labstack/echo/v4"
)
Expand All @@ -16,6 +17,9 @@ type SecureConfig struct {

// XSSProtection provides protection against cross-site scripting attack (XSS)
// by setting the `X-XSS-Protection` header.
// Note: This header is deprecated in modern browsers. For more information, see
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
// and consider using Content-Security-Policy instead.
// Optional. Default value "1; mode=block".
XSSProtection string `yaml:"xss_protection"`

Expand Down Expand Up @@ -118,15 +122,15 @@ func SecureWithConfig(config SecureConfig) echo.MiddlewareFunc {
if config.XFrameOptions != "" {
res.Header().Set(echo.HeaderXFrameOptions, config.XFrameOptions)
}
if (c.IsTLS() || (req.Header.Get(echo.HeaderXForwardedProto) == "https")) && config.HSTSMaxAge != 0 {
subdomains := ""
if (c.IsTLS() || (req.Header.Get(echo.HeaderXForwardedProto) == "https")) && config.HSTSMaxAge > 0 {
hsts := []string{fmt.Sprintf("max-age=%d", config.HSTSMaxAge)}
if !config.HSTSExcludeSubdomains {
subdomains = "; includeSubdomains"
hsts = append(hsts, "includeSubdomains")
}
if config.HSTSPreloadEnabled {
subdomains = fmt.Sprintf("%s; preload", subdomains)
hsts = append(hsts, "preload")
}
res.Header().Set(echo.HeaderStrictTransportSecurity, fmt.Sprintf("max-age=%d%s", config.HSTSMaxAge, subdomains))
res.Header().Set(echo.HeaderStrictTransportSecurity, strings.Join(hsts, "; "))
}
if config.ContentSecurityPolicy != "" {
if config.CSPReportOnly {
Expand Down