58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package utils
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import (
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"fmt"
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"net/http"
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"strings"
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"fiskerinc.com/modules/logger"
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"fiskerinc.com/modules/validator"
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)
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// ParseVINFromRequest retrieves VIN from "Ssl-Client-Subject-Dn"
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//
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// which is generated by NGINX through a cert on websocket request
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func ParseVINFromRequest(r *http.Request) (vin string, err error) {
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// Try SDK 1.2 format first: Ssl-Client-Subject-Dn header
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vin = retrieveCommonNameFromHeaderSSLClientSubject(r)
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if vin == "" {
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// Try SDK 1.4 format: Ssl header
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vin = retrieveCommonNameFromHeaderSSL(r)
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}
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ok := validator.ValidateVINSimple(vin)
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if ok {
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return vin, nil
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}
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// If neither header format contains a VIN, return error
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return "", fmt.Errorf("VIN not found in request headers: '%s' bad value", vin)
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}
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func retrieveCommonNameFromHeaderSSL(r *http.Request) (vin string) {
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sslHeader := r.Header.Get("Ssl")
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logger.Info().Str("SSL Header Value", sslHeader).Msg("CSDK 1.2 VIN Format Failed, trying 1.4")
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if sslHeader != "" {
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// Extract VIN from "CN=VIN_HERE" format
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if strings.HasPrefix(sslHeader, "CN=") {
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vin = strings.TrimPrefix(sslHeader, "CN=")
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}
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}
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return
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}
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func retrieveCommonNameFromHeaderSSLClientSubject(r *http.Request) string {
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dn := r.Header.Values("Ssl-Client-Subject-Dn")
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for _, d := range dn {
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fields := strings.Split(d, ",")
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for _, field := range fields {
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if len(field) > 3 && field[:3] == "CN=" {
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return field[3:]
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}
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}
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}
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return ""
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}
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