93 lines
1.8 KiB
Go
93 lines
1.8 KiB
Go
package twitter
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import (
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"fmt"
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"net/http"
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"regexp"
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"strings"
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"unicode/utf8"
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"forge.cadoles.com/pcaseiro/namecheck"
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)
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const (
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sizeMin = 1
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sizeMax = 15
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legalChars = "^[a-zA-Z0-9_]+$"
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illegalPattern = "twitter"
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twitterUrl = "https://twitter.com"
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)
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type Twitter struct {
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HttpClient http.Client
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Responds bool
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}
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var (
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legal = regexp.MustCompile(legalChars)
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illegal = regexp.MustCompile(illegalPattern)
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)
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func containsOnlyLegalChars(username string) bool {
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return legal.MatchString(username)
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}
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func containsNoIllegalPattern(username string) bool {
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if strings.Contains(strings.ToLower(username), illegalPattern) {
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return false
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}
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return true
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}
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func isLongEnough(username string) bool {
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return utf8.RuneCountInString(username) > sizeMin
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}
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func isShortEnough(username string) bool {
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return utf8.RuneCountInString(username) <= sizeMax
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}
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func (t *Twitter) IsValid(username string) bool {
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if !containsNoIllegalPattern(username) {
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return false
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}
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if !containsOnlyLegalChars(username) {
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return false
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}
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if !isLongEnough(username) {
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return false
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}
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if !isShortEnough(username) {
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return false
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}
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return true
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}
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// Name return a string with the name of the "Social Media"
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func (t *Twitter) String() string {
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return "Twitter"
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}
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// IsAvailable check if a user name is valid and available on twitter
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func (t *Twitter) IsAvailable(username string) (bool, error) {
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resp := t.IsValid(username)
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if resp {
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url := fmt.Sprintf("%s/%s", twitterUrl, username)
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resp, err := t.HttpClient.Get(url)
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if err != nil {
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t.Responds = false
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nerr := &namecheck.ErrUnknownAvailability{Username: username, Cause: err}
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return false, nerr
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}
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t.Responds = true
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusNotFound {
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return false, nil
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}
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return true, nil
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}
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return false, fmt.Errorf("Username is not valid")
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}
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