Using Golang functions for parameter validation in API gateway

In the API gateway, using Golang functions to verify API request parameters can: prevent invalid or malicious input from entering the back-end system. Verify that the request body is empty. Verify that required fields exist. Verify that a numeric field is a number. Verify that a string field conforms to a regular expression.

Using Golang functions in API gateway for parameter verification

Introduction
When building based on Parameter validation is critical when building cloud applications to prevent invalid or malicious input from entering the back-end system. An API gateway is an intermediary layer that manages API traffic and provides security features such as parameter validation. This tutorial will guide you on how to use Golang functions to validate API request parameters in API Gateway.

Prerequisites

• Installed Golang environment
• Deployed API gateway
• Basic Golang programming knowledge

Set up the project

1. Create a new Golang project:

   go mod init my-validation-function

2. Import necessary Package:

   import (
    "context"
    "errors"
    "fmt"
    "net/http"
    "regexp"
    "strconv"
   
    "github.com/cloudevents/sdk-go/v2/event"
   )

##Write Golang function

1. Define a Golang function for verifying request parameters:

   func validate(ctx context.Context, event event.Event) (*http.Response, error) {
    // 获取HTTP请求正文
    request := event.HTTP
    body := request.Body
   
    // 验证请求正文的必需字段
    if body == nil || len(body) == 0 {
        return nil, errors.New("request body is empty")
    }
   
    // 获取字段值
    name := request.URL.Query().Get("name")
    age := request.URL.Query().Get("age")
   
    // 验证字段值
    if name == "" {
        return nil, errors.New("name is required")
    }
    if age == "" {
        return nil, errors.New("age is required")
    }
   
    // 验证age是否为数字
    if _, err := strconv.Atoi(age); err != nil {
        return nil, errors.New("age must be a number")
    }
   
    // 验证name是否符合正则表达式
    nameRegex := regexp.MustCompile("[a-zA-Z]+")
    if !nameRegex.MatchString(name) {
        return nil, errors.New("name must contain only letters")
    }
   
    // 返回验证成功的响应
    return &http.Response{
        StatusCode: http.StatusOK,
        Body:       http.NoBody,
    }, nil
   }

Deploy FunctionDeploy the function using your own API Gateway deployment mechanism and configure it to be used to authenticate specific API requests. See the API Gateway documentation for specific deployment steps.

Practical case Suppose you have an API endpoint
/validate, receiving two name and age Query parameters. Using the Golang function we wrote, you can verify that the input conforms to the following rules:

• name is required and can only contain letters.
• age is required and must be a number.

Test verificationUse a REST client or browser to test the verification function:

• Send a request containing valid parameters :

  GET /validate?name=John&age=30

• Sending a request containing invalid parameters:

  GET /validate?name=123&age=hello

ConclusionBy using Golang functions, You can implement strong parameter validation in your API gateway to ensure data quality on API requests and prevent potential security vulnerabilities.


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