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Standard library · Network

net/http/validate

Checking form input and answering with a 400.

import net.http.validate
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  1. Functions

The functions here check one value and return true or false. Assert sends a 400 response with a JSON message when the condition does not hold; after that the handler must not write another response.

Functions

Required

func Required(value: str): bool
True when the value is not empty; whitespace counts as a value.
net-http-validate-Check.salam
import net.http
import net.http.validate
import net.router

func signup(ctx: i64):
    email := http.Ctx_form(ctx, "email")
    validate.Assert(ctx, validate.IsEmail(email), "invalid email")
    if validate.IsEmail(email):
        http.Ctx_text(ctx, "welcome")
    end
end

func main:
    println validate.Required(""), validate.Required("  "), validate.Required("Ali")
    println validate.Length("hello", 2, 5), validate.Length("hello world", 2, 5)
    println validate.IsEmail("ali@example.com"), validate.IsEmail("ali@")
    println validate.Matches("09121234567", "^09[0-9]{9}$"), validate.Matches("12345", "^09[0-9]{9}$")
    mut r := router.NewRouter()
    router.Post(r, "/signup", signup)
    mut s := http.NewServer(19625)
    http.Use(s, r)
    _ := http.RunBackground(s)
    mut headers := http.NewHeaders()
    headers.insert("Content-Type", "application/x-www-form-urlencoded")
    bad := http.PostWith("http://127.0.0.1:19625/signup", "email=x", headers)
    println http.Status(bad), http.Body(bad)
    good := http.PostWith("http://127.0.0.1:19625/signup", "email=a%40b.ir", headers)
    println http.Status(good), http.Body(good)
end
Outputfalse true true true false true false true false 400 {"error":"invalid email"} 200 welcome

Length

func Length(value: str, min_len: int, max_len: int): bool
True when the number of characters is between the minimum and the maximum.

The example for this item is shown with the ones above: net-http-validate-Check.salam

IsEmail

func IsEmail(value: str): bool
A very simple email check: the text has to hold an @ and a dot. To be sure, send a confirmation email.

The example for this item is shown with the ones above: net-http-validate-Check.salam

Matches

func Matches(value: str, pattern: str): bool
True when the value matches the regular expression.

The example for this item is shown with the ones above: net-http-validate-Check.salam

Assert

func Assert(ctx: i64, ok: bool, message: str)
When the condition is false, sends a 400 response with {"error": message}.

The example for this item is shown with the ones above: net-http-validate-Check.salam