131 lines
7.8 KiB
Go
131 lines
7.8 KiB
Go
package atom
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import (
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"encoding/xml"
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"fmt"
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"html"
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"mime"
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"regexp"
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"strings"
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"time"
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"github.com/google/uuid"
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"golang.org/x/text/language"
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)
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type Countable interface {
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*xml.Attr | *Person | *Category | *Link | *ExtensionElement | *Entry
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}
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// addToSlice adds a Countable to to a *[]Countable. It returns an int.
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func addToSlice[C Countable](slice *[]C, countable C) int {
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if *slice == nil {
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*slice = make([]C, 0)
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}
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*slice = append(*slice, countable)
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return len(*slice) - 1
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}
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// deleteFromSlice deletes the Countable with the index from the *[]Countable.
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// It return an error.
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func deleteFromSlice[C Countable](slice *[]C, index int) error {
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length := len(*slice)
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if index > length {
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return fmt.Errorf("id %v out of range %v", index, length)
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}
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*slice = append((*slice)[:index], (*slice)[index+1:]...)
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return nil
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}
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// isValidIRI checks whether an IRI is valid or not. It returns a bool.
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// https://www.w3.org/2011/04/XMLSchema/TypeLibrary-IRI-RFC3987.xsd
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func isValidIRI(iri string) bool {
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pattern := `((([A-Za-z])[A-Za-z0-9+\-\.]*):((//(((([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------!$&'()*+,;=:]|(%[0-9A-Fa-f][0-9A-Fa-f]))*@))?((\[((((([0-9A-Fa-f]{0,4}:)){6}(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|(::(([0-9A-Fa-f]{0,4}:)){5}(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|(([0-9A-Fa-f]{0,4})?::(([0-9A-Fa-f]{0,4}:)){4}(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|((((([0-9A-Fa-f]{0,4}:))?[0-9A-Fa-f]{0,4}))?::(([0-9A-Fa-f]{0,4}:)){3}(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|((((([0-9A-Fa-f]{0,4}:)){0,2}[0-9A-Fa-f]{0,4}))?::(([0-9A-Fa-f]{0,4}:)){2}(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|((((([0-9A-Fa-f]{0,4}:)){0,3}[0-9A-Fa-f]{0,4}))?::[0-9A-Fa-f]{0,4}:(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|((((([0-9A-Fa-f]{0,4}:)){0,4}[0-9A-Fa-f]{0,4}))?::(([0-9A-Fa-f]{0,4}:[0-9A-Fa-f]{0,4})|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))))|((((([0-9A-Fa-f]{0,4}:)){0,5}[0-9A-Fa-f]{0,4}))?::[0-9A-Fa-f]{0,4})|((((([0-9A-Fa-f]{0,4}:)){0,6}[0-9A-Fa-f]{0,4}))?::))|(v[0-9A-Fa-f]+\.[A-Za-z0-9\-\._~!$&'()*+,;=:]+))\])|(([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))\.([0-9]|([1-9][0-9])|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5])))|(([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=]))*)((:[0-9]*))?)((/(([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@]))*))*)|(/(((([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@]))+((/(([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@]))*))*))?)|((([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@]))+((/(([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@]))*))*)|)((\?(([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@])|[---/?])*))?((#((([A-Za-z0-9\-\._~ -豈-﷏ﷰ-𐀀-𠀀-𰀀------------]|(%[0-9A-Fa-f][0-9A-Fa-f])|[!$&'()*+,;=:@])|/|\?))*))?)`
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return regexp.MustCompile(pattern).MatchString(iri)
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}
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// isCorrectlyEscaped checks whether a string is correctly escaped as per
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// RFC4287. It returns a bool.
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func isCorrectlyEscaped(text string) bool {
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relevantEntities := []string{"&", "<", ">", """, "'"}
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for _, entity := range relevantEntities {
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if strings.Contains(text, entity) {
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return false
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}
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}
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return true
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}
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// isCompositeMediaType checks whether a string is a composite media type. It
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// returns a bool.
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func isCompositeMediaType(m string) bool {
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mediaType, _, err := mime.ParseMediaType(m)
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if err != nil {
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return false
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}
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return strings.HasPrefix(mediaType, "multipart/") || strings.HasPrefix(mediaType, "message/")
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}
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// isXMLMediaType checks whether a string is an xml media type. It returns a
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// bool.
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func isXMLMediaType(m string) bool {
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mediaType, _, err := mime.ParseMediaType(m)
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if err != nil {
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return false
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}
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return strings.HasSuffix(mediaType, "/xml") || strings.HasSuffix(mediaType, "+xml")
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}
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// isValidMediaType checks whether a string is a valid media type. It returns a
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// bool.
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func isValidMediaType(m string) bool {
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mediaType, _, err := mime.ParseMediaType(m)
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if err != nil {
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return false
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}
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typeParts := strings.Split(mediaType, "/")
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if len(typeParts) != 2 || typeParts[0] == "" || typeParts[1] == "" {
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return false
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}
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return true
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}
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// isValidLanguageTag checks whether a LanguageTag is valid. It returns a bool.
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func isValidLanguageTag(languageTag string) bool {
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_, err := language.Parse(languageTag)
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return err == nil
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}
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// isValidAttribute checks whether an Attribute is valid. It returns a bool.
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func isValidAttribute(attribute string) bool {
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regex := regexp.MustCompile(`^[a-zA-Z0-9_]+="[^"]*"$`)
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return regex.MatchString(attribute)
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}
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// update updates the Date
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func updateDateTime(d *Date) {
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if d == nil {
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d = NewDate(time.Now())
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} else {
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d.DateTime = DateTime(time.Now())
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}
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}
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// NewURN generates an new valid IRI based on a UUID. It returns an IRI.
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func NewURN() string {
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return fmt.Sprint("urn:uuid:", uuid.New())
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}
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// Unescape unescapes a string. It returns an IRI.
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func Unescape(s string) string {
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return html.UnescapeString(s)
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}
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