60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
package middleware
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import (
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"github.com/gorilla/websocket"
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"net/http"
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"strings"
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)
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// CORS middleware настраивает политику кросс-доменных запросов
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func CORS(allowedOrigins []string) 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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if websocket.IsWebSocketUpgrade(r) {
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next.ServeHTTP(w, r)
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return
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}
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origin := r.Header.Get("Origin")
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if IsOriginAllowed(origin, allowedOrigins) {
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w.Header().Set("Access-Control-Allow-Origin", origin)
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w.Header().Set("Access-Control-Allow-Credentials", "true")
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w.Header().Set("Access-Control-Allow-Headers",
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"Accept, Content-Type, Content-Length, Accept-Encoding, Authorization, bypass-auth")
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w.Header().Set("Access-Control-Allow-Methods",
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"GET, POST, PUT, DELETE, OPTIONS")
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}
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if r.Method == "OPTIONS" {
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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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// isOriginAllowed проверяет разрешен ли домен для CORS
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func IsOriginAllowed(origin string, allowedOrigins []string) bool {
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if origin == "" {
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return false
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}
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// Разрешаем все источники в development
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if len(allowedOrigins) == 1 && allowedOrigins[0] == "*" {
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return true
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}
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// Точноe сравнение с разрешенными доменами
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for _, allowed := range allowedOrigins {
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if strings.EqualFold(origin, allowed) {
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return true
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}
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}
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return false
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}
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