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validator.go
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validator.go
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package main
import (
"regexp"
"strings"
"github.com/valyala/fasthttp"
)
func invalidCredentials(ctx *fasthttp.RequestCtx, userData User) (invalid bool) {
invalid = false
var (
name = strings.TrimSpace(userData.Username)
email = strings.TrimSpace(userData.Email)
password = strings.TrimSpace(userData.Password)
emailRE = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
alphanumeric = regexp.MustCompile("^[a-zA-Z0-9_]*$")
message = ""
)
if name == "" {
message = "username field cannot be empty"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if len(name) < 3 {
message = "username should be atleast 3 characters long"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if len(name) > 18 {
message = "username should not exceed 18 characters"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if !alphanumeric.MatchString(name) {
message = "username can contain only alphabets, numbers, and underscore"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if email == "" {
message = "email field cannot be empty"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if !emailRE.MatchString(email) {
message = "Enter a valid email"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if password == "" {
message = "password field cannot be empty"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
if len(password) < 6 {
message = "password should be up to 6 characters long"
errorResponseHandler(ctx, message, 400)
invalid = true
return
}
return
}