bfd5e354ad
Combine role-based permissions (VerifyAccess/GetUserRole) with audit trail (IP/user-agent context capture) in auth middleware and tenant resolver.
79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
package auth
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import (
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"context"
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"log/slog"
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"net/http"
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"github.com/google/uuid"
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)
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// TenantLookup resolves and verifies tenant access for a user.
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// Defined as an interface to avoid circular dependency with services.
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type TenantLookup interface {
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FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error)
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VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error)
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GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error)
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}
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// TenantResolver is middleware that resolves the tenant from X-Tenant-ID header
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// or defaults to the user's first tenant. Always verifies user has access.
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type TenantResolver struct {
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lookup TenantLookup
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}
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func NewTenantResolver(lookup TenantLookup) *TenantResolver {
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return &TenantResolver{lookup: lookup}
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}
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func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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userID, ok := UserFromContext(r.Context())
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if !ok {
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http.Error(w, `{"error":"unauthorized"}`, http.StatusUnauthorized)
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return
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}
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var tenantID uuid.UUID
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if header := r.Header.Get("X-Tenant-ID"); header != "" {
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parsed, err := uuid.Parse(header)
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if err != nil {
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http.Error(w, `{"error":"invalid X-Tenant-ID"}`, http.StatusBadRequest)
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return
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}
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// Verify user has access and get their role
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role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
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if err != nil {
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slog.Error("tenant access check failed", "error", err, "user_id", userID, "tenant_id", parsed)
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http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
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return
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}
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if role == "" {
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http.Error(w, `{"error":"no access to tenant"}`, http.StatusForbidden)
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return
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}
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tenantID = parsed
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r = r.WithContext(ContextWithUserRole(r.Context(), role))
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} else {
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// Default to user's first tenant (role already set by middleware)
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first, err := tr.lookup.FirstTenantForUser(r.Context(), userID)
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if err != nil {
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slog.Error("failed to resolve default tenant", "error", err, "user_id", userID)
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http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
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return
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}
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if first == nil {
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http.Error(w, `{"error":"no tenant found for user"}`, http.StatusBadRequest)
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return
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}
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tenantID = *first
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}
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ctx := ContextWithTenantID(r.Context(), tenantID)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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