keycloak~巧用client-scope实现token字段和userinfo接口的授权

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keycloak中的client-scope允许你为每个客户端分配scope，而scope就是授权范围，它直接影响了token中的内容，及userinfo端点可以获取到的用户信息，这块我们可以通过自定义scope/mapper，来实现粒度的控制，并且这个mapper可以控制添加到token，或者添加到userinfo端点，这两块配置也是独立的，下面我们通过一个登录IP地址的mapper，来实现将登录ip添加到token和userinfo端点。

添加Mapper对象

```
public class ExtensionLoginIpMapper
        extends AbstractOIDCProtocolMapper
        implements OIDCAccessTokenMapper, OIDCIDTokenMapper, UserInfoTokenMapper {
    public static final String CONFIG_NAME = "ExtensionLoginIp";//配置里的名称
    public static final String PROVIDER_ID = "oidc-extension-login-ip-mapper";
    private static final List configProperties = new ArrayList();
    private static final String LOGIN_IP = "loginIp";

    static {
        configProperties.add(createConfigProperty(CONFIG_NAME, "Token申请名", "在jwt中的属性名称，默认loginIp"));
        OIDCAttributeMapperHelper.addIncludeInTokensConfig(configProperties, ExtensionLoginIpMapper.class);
    }

    protected static ProviderConfigProperty createConfigProperty(String claimName, String label, String help) {
        ProviderConfigProperty property = new ProviderConfigProperty();
        property.setName(claimName);
        property.setLabel(label);
        property.setHelpText(help);
        property.setType(ProviderConfigProperty.STRING_TYPE);
        return property;
    }

    @Override
    protected void setClaim(IDToken token, ProtocolMapperModel mappingModel, UserSessionModel userSession,
                            KeycloakSession keycloakSession, ClientSessionContext clientSessionCtx) {
        try {
            String key = LOGIN_IP;
            if (mappingModel.getConfig().containsKey(CONFIG_NAME)) {
                key = mappingModel.getConfig().get(CONFIG_NAME);
            }

            if (userSession.getNotes().containsKey(LOGIN_IP)) {
                String val = userSession.getNote(LOGIN_IP);
                token.setOtherClaims(key, val);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public List getConfigProperties() {
        return configProperties;
    }

    @Override
    public String getId() {
        return PROVIDER_ID;
    }

    @Override
    public String getDisplayType() {
        return CONFIG_NAME;
    }

    @Override
    public String getDisplayCategory() {
        return TOKEN_MAPPER_CATEGORY;
    }

    @Override
    public String getHelpText() {
        return "Maps Extension Login Ip Address.";
    }
}
```