49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
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package middleware
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import "net/http"
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// CorsMiddleware — browser CORS for Harbor Desk FE.
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// Note: cannot combine Access-Control-Allow-Origin: * with Allow-Credentials: true
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// (browsers reject). FE uses Bearer token (no cookies), so no credentials header.
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type CorsMiddleware struct{}
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func NewCorsMiddleware() *CorsMiddleware {
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return &CorsMiddleware{}
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}
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func (m *CorsMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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setHeader(w, r)
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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next(w, r)
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}
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}
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func (m *CorsMiddleware) Handler() http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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setHeader(w, r)
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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w.WriteHeader(http.StatusNotFound)
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})
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}
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func setHeader(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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origin = "*"
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}
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// Echo request origin (dev-friendly). Production can whitelist later.
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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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w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Request-Id, device_id")
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w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, PATCH")
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w.Header().Set("Access-Control-Expose-Headers", "Content-Length, Content-Type")
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// Do NOT set Allow-Credentials with wildcard; FE uses Authorization header only.
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}
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