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87 lines
3.0 KiB
Go
87 lines
3.0 KiB
Go
// See also https://www.alexedwards.net/blog/validation-snippets-for-go
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// for more validation snippets
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//
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// A NonFieldError for example would be "Your email or password is incorrect".
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// more secure because it does not leak which field was in error. Used in the login
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// form
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package validator
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import (
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"regexp"
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"slices"
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"strings"
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"unicode/utf8"
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)
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type Validator struct {
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NonFieldErrors []string
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FieldErrors map[string]string
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}
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// Valid() returns true if the FieldErrors map doesn't contain any entries.
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func (v *Validator) Valid() bool {
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return len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0
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}
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func (v *Validator) AddNonFieldError(message string) {
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v.NonFieldErrors = append(v.NonFieldErrors, message)
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}
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// AddFieldError() adds an error message to the FieldErrors map (so long as no
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// entry already exists for the given key).
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func (v *Validator) AddFieldError(key, message string) {
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if v.FieldErrors == nil {
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v.FieldErrors = make(map[string]string)
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}
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if _, exists := v.FieldErrors[key]; !exists {
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v.FieldErrors[key] = message
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}
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}
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// CheckField() adds an error message to the FieldErrors map only if a
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// validation check is not 'ok'.
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func (v *Validator) CheckField(ok bool, key, message string) {
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if !ok {
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v.AddFieldError(key, message)
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}
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}
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// NotBlank() returns true if a value is not an empty string.
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func NotBlank(value string) bool {
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return strings.TrimSpace(value) != ""
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}
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// MinChars() returns true if the value contains equal to or greater than n characters
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func MinChars(value string, n int) bool {
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return utf8.RuneCountInString(value) >= n
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}
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// MaxChars() returns true if a value contains no more than n characters.
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func MaxChars(value string, n int) bool {
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return utf8.RuneCountInString(value) <= n
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}
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// PermittedValue() returns true if a value is in a list of specific permitted
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// values.
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func PermittedValue[T comparable](value T, permittedValues ...T) bool {
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return slices.Contains(permittedValues, value)
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}
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// Use the regexp.MustCompile() function to parse a regular expression pattern
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// for sanity checking the format of an email address. This returns a pointer to
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// a 'compiled' regexp.Regexp type, or panics in the event of an error. Parsing
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// this pattern once at startup and storing the compiled *regexp.Regexp in a
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// variable is more performant than re-parsing the pattern each time we need it.
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// This pattern is recommended by the W3C and Web Hypertext Application Technology Working Group for validating email addresses
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// https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address
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// Because the EmailRX regexp pattern is written as an interpreted string literal, we need to double-escape special characters in the regexp with \\ for it to work correctly
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var EmailRX = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
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// Matches() returns true if a value matches a provided compiled regular
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// expression pattern.
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func Matches(value string, rx *regexp.Regexp) bool {
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return rx.MatchString(value)
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}
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