udemy-go-web-1/internal/forms/forms.go

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package forms
import (
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"fmt"
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"net/http"
"net/url"
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"strings"
"github.com/asaskevich/govalidator"
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)
// Form creates a custom form struct, embeds a url.Values object
type Form struct {
url.Values
Errors errors
}
// New initializes a form struct
func New(data url.Values) *Form {
return &Form{
data,
errors(map[string][]string{}),
}
}
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// Required checks required fields
func (f *Form) Required(fields ...string) {
for _, field := range fields {
value := f.Get(field)
if strings.TrimSpace(value) == "" {
f.Errors.Add(field, "This field cannot be blank")
}
}
}
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// Has checks if form field is in post and not emtpy
func (f *Form) Has(field string, r *http.Request) bool {
x := r.Form.Get(field)
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return x != ""
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}
// Valid returns true if there are no errors, otherwise false
func (f *Form) Valid() bool {
return len(f.Errors) == 0
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}
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// MinLength checks for string minimum length
func (f *Form) MinLength(field string, length int, r *http.Request) bool {
value := r.Form.Get(field)
if len(value) < length {
f.Errors.Add(field, fmt.Sprintf("This field must have at least %d letters", length))
return false
}
return true
}
// IsEmail checks the email address
func (f *Form) IsEmail(field string, r *http.Request) {
value := r.Form.Get(field)
if !govalidator.IsEmail(value) {
f.Errors.Add(field, "Invalid email address")
}
}