问Java - GoogleIdTokenVerifier验证令牌字符串返回空

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    private Map<String,String> getMapFromGoogleTokenString(final String idTokenString){
        BufferedReader in = null;
        try {
            // get information from token by contacting the google_token_verify_tool url :
            in = new BufferedReader(new InputStreamReader(
                                        ((HttpURLConnection) (new URL("https://www.googleapis.com/oauth2/v3/tokeninfo?id_token=" + idTokenString.trim()))
                                        .openConnection()).getInputStream(), Charset.forName("UTF-8")));

            // read information into a string buffer :
            StringBuffer b = new StringBuffer();
            String inputLine;
            while ((inputLine = in.readLine()) != null){
                b.append(inputLine + "\n");
            }

            // transforming json string into Map<String,String> :
            ObjectMapper objectMapper = new ObjectMapper();
            return objectMapper.readValue(b.toString(), objectMapper.getTypeFactory().constructMapType(Map.class, String.class, String.class));

        // exception handling :
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch(Exception e){
            System.out.println("\n\n\tFailed to transform json to string\n");
            e.printStackTrace();
        } finally{
            if(in!=null){
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

    // chack the "email_verified" and "email" values in token payload 
    private boolean verifyEmail(final Map<String,String> tokenPayload){
        if(tokenPayload.get("email_verified")!=null && tokenPayload.get("email")!=null){
            try{
                return Boolean.valueOf(tokenPayload.get("email_verified")) && tokenPayload.get("email").contains("@gmail.");
            }catch(Exception e){
                System.out.println("\n\n\tCheck emailVerified failed - cannot parse "+tokenPayload.get("email_verified")+" to boolean\n");
            }
        }else{
            System.out.println("\n\n\tCheck emailVerified failed - required information missing in the token");
        }
        return false;
    }

    // check token expiration is after now :
    private boolean checkExpirationTime(final Map<String,String> tokenPayload){
        try{
            if(tokenPayload.get("exp")!=null){
                // the "exp" value is in seconds and Date().getTime is in mili seconds
                return Long.parseLong(tokenPayload.get("exp")+"000") > new java.util.Date().getTime();
            }else{
                System.out.println("\n\n\tCheck expiration failed - required information missing in the token\n");
            }
        }catch(Exception e){
            System.out.println("\n\n\tCheck expiration failed - cannot parse "+tokenPayload.get("exp")+" into long\n");
        }
        return false;
    }

    // check that at least one CLIENT_ID matches with token values
    private boolean checkAudience(final Map<String,String> tokenPayload){
        if(tokenPayload.get("aud")!=null && tokenPayload.get("azp")!=null){
            List<String> pom = Arrays.asList("MY_CLIENT_ID_1",
                                             "MY_CLIENT_ID_2",
                                             "MY_CLIENT_ID_3");

            if(pom.contains(tokenPayload.get("aud")) || pom.contains(tokenPayload.get("azp"))){
                return true;
            }else{
                System.out.println("\n\n\tCheck audience failed - audiences differ\n");
                return false;
            }
        }
        System.out.println("\n\n\tCheck audience failed - required information missing in the token\n");
        return false;
    }

    // verify google token payload :
    private boolean doTokenVerification(final Map<String,String> tokenPayload){
        if(tokenPayload!=null){
            return verifyEmail(tokenPayload) // check that email address is verifies 
                && checkExpirationTime(tokenPayload) // check that token is not expired
                && checkAudience(tokenPayload) // check audience
                ; 
        }
        return false;
    }