104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// ©AngelaMos | 2026
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// headers.go
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package middleware
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import (
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"net/http"
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"strconv"
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"strings"
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"github.com/CarterPerez-dev/cybersecurity-projects/canary-token-generator/backend/internal/config"
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)
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func SecurityHeaders(isProduction bool) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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h := w.Header()
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h.Set("X-Content-Type-Options", "nosniff")
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h.Set("X-Frame-Options", "DENY")
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h.Set("X-XSS-Protection", "1; mode=block")
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h.Set("Referrer-Policy", "strict-origin-when-cross-origin")
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h.Set(
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"Permissions-Policy",
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"geolocation=(), microphone=(), camera=()",
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)
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if isProduction {
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h.Set(
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"Strict-Transport-Security",
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"max-age=31536000; includeSubDomains; preload",
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)
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}
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h.Set("Content-Security-Policy", buildCSP(isProduction))
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next.ServeHTTP(w, r)
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})
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}
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}
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func buildCSP(isProduction bool) string {
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directives := []string{
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"default-src 'self'",
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"script-src 'self'",
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"style-src 'self' 'unsafe-inline'",
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"img-src 'self' data: https:",
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"font-src 'self'",
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"connect-src 'self'",
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"frame-ancestors 'none'",
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"base-uri 'self'",
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"form-action 'self'",
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}
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if !isProduction {
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directives[1] = "script-src 'self' 'unsafe-inline' 'unsafe-eval'"
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}
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return strings.Join(directives, "; ")
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}
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func CORS(cfg config.CORSConfig) func(http.Handler) http.Handler {
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allowedOrigins := make(map[string]struct{}, len(cfg.AllowedOrigins))
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for _, origin := range cfg.AllowedOrigins {
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allowedOrigins[origin] = struct{}{}
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}
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methodsStr := strings.Join(cfg.AllowedMethods, ", ")
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headersStr := strings.Join(cfg.AllowedHeaders, ", ")
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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origin := r.Header.Get("Origin")
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if origin != "" {
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if _, ok := allowedOrigins[origin]; ok {
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w.Header().Set("Access-Control-Allow-Origin", origin)
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w.Header().Set("Vary", "Origin")
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if cfg.AllowCredentials {
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w.Header().
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Set("Access-Control-Allow-Credentials", "true")
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}
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}
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}
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if r.Method == http.MethodOptions {
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w.Header().Set("Access-Control-Allow-Methods", methodsStr)
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w.Header().Set("Access-Control-Allow-Headers", headersStr)
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if cfg.MaxAge > 0 {
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w.Header().
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Set("Access-Control-Max-Age", strconv.Itoa(cfg.MaxAge))
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}
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w.WriteHeader(http.StatusNoContent)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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}
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