Rust - validator 結構體字段驗證

一、添加 validator 依賴庫

validator 是基於過程宏的方式注入

[dependencies]
validator = "0.10.0"
validator_derive = "0.10.0"
serde = "1.0.105"
serde_json = "1.0.50"
serde_derive = "1.0.105"

二、使用示例

1、注入過程宏

#[macro_use]
extern crate validator_derive;
extern crate validator;

use serde_derive::{Deserialize};
use validator::{Validate, ValidationErrors};

#[derive(Debug, Validate, Deserialize)]
struct RegisterForm {
    #[validate(length(max = 10, message="username must be less than 10 chars."))]
    username: Option<String>,
    #[validate(length(min = 6, message="password must be more than 6 chars."))]
    password: Option<String>,
    #[validate(length(equal = 4, message="captcha is 4 chars."))]
    captcha: Option<String>,
    #[validate(custom(function="valid_custom_fn", message="invlaid identity"))]
    identity: Option<String>,
}

fn valid_custom_fn(value: &str) -> Result<(), ValidationError> {
    if value != "123123" {
        return Err(ValidationError::new("invalid identity"))
    }
    Ok(())
}

2、解析json格式請求參數

    let put = r#"{"username": "daojianshenjun", "password": "5678", "captcha": "12345", "identity": "111"}"#;
    let p: RegisterForm = serde_json::from_str(put).unwrap();

3、校驗結構體規則

    if let Err(e) = p.validate() {
        println!("{:?}", e);
    }

三、過程宏的規則列表

規則名	描述
length(min, max, equal)	判斷字符串的長度
range(min, max)	判斷數字的範圍
email	郵箱
url	url
phone	手機號碼，需要開啓feature【phone】
credit_card	信用卡，需要開啓feature【card】
custom(function)	自定義校驗規則的函數名，如valid_custom_fn
contains(pattern)	字符串必須包含有pattern
must_match(other)	當前字段必須和另一個字段一模一樣
regex(path)	正則表達式，path必須爲當前作用域有效的靜態變量，正則字符串
nested	嵌套驗證，直接註解不需要參數，#[validate]
non_control_character	unicode 字符集
schema(function,skip_on_field_errors)	校驗結構體struct