67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
package validator
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import (
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"regexp"
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"slices"
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)
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// Declare a regular expression for sanity checking the format of email addresses (we'll
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// use this later in the book). If you're interested, this regular expression pattern is
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// taken from https://html.spec.whatwg.org/#valid-e-mail-address. Note: if you're
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// reading this in PDF or EPUB format and cannot see the full pattern, please see the
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// note further down the page.
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var (
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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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)
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// Define a new Validator type which contains a map of validation errors.
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type Validator struct {
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Errors map[string]string
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}
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// New is a helper which creates a new Validator instance with an empty errors map.
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func New() *Validator {
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return &Validator{Errors: make(map[string]string)}
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}
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// Valid returns true if the errors map doesn't contain any entries.
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func (v *Validator) Valid() bool {
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return len(v.Errors) == 0
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}
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// AddError adds an error message to the map (so long as no entry already exists for
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// the given key).
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func (v *Validator) AddError(key, message string) {
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if _, exists := v.Errors[key]; !exists {
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v.Errors[key] = message
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}
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}
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// Check adds an error message to the map only if a validation check is not 'ok'.
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func (v *Validator) Check(ok bool, key, message string) {
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if !ok {
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v.AddError(key, message)
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}
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}
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// In returns true if a specific value is in a list of strings.
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func In(value string, list ...string) bool {
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return slices.Contains(list, value)
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}
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// Matches returns true if a string value matches a specific regexp 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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// Unique returns true if all string values in a slice are unique.
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func Unique(values []string) bool {
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uniqueValues := make(map[string]bool, 5)
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for _, value := range values {
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uniqueValues[value] = true
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}
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return len(values) == len(uniqueValues)
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}
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