123 lines
4.2 KiB
Go
123 lines
4.2 KiB
Go
package activitypub
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var validLinkTypes = [...]ActivityVocabularyType{
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MentionType,
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}
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// A Link is an indirect, qualified reference to a resource identified by a URL.
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// The fundamental model for links is established by [ RFC5988].
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// Many of the properties defined by the Activity Vocabulary allow values that are either instances of APObject or Link.
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// When a Link is used, it establishes a qualified relation connecting the subject
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// (the containing object) to the resource identified by the href.
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// Properties of the Link are properties of the reference as opposed to properties of the resource.
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type Link struct {
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// Provides the globally unique identifier for an APObject or Link.
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ID ID `jsonld:"id,omitempty"`
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// Identifies the APObject or Link type. Multiple values may be specified.
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Type ActivityVocabularyType `jsonld:"type,omitempty"`
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// A simple, human-readable, plain-text name for the object.
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// HTML markup MUST NOT be included. The name MAY be expressed using multiple language-tagged values.
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Name NaturalLanguageValues `jsonld:"name,omitempty,collapsible"`
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// A link relation associated with a Link. The value must conform to both the [HTML5] and
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// [RFC5988](https://tools.ietf.org/html/rfc5988) "link relation" definitions.
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// In the [HTML5], any string not containing the "space" U+0020, "tab" (U+0009), "LF" (U+000A),
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// "FF" (U+000C), "CR" (U+000D) or "," (U+002C) characters can be used as a valid link relation.
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Rel IRI `jsonld:"rel,omitempty"`
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// When used on a Link, identifies the MIME media type of the referenced resource.
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MediaType MimeType `jsonld:"mediaType,omitempty"`
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// On a Link, specifies a hint as to the rendering height in device-independent pixels of the linked resource.
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Height uint `jsonld:"height,omitempty"`
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// On a Link, specifies a hint as to the rendering width in device-independent pixels of the linked resource.
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Width uint `jsonld:"width,omitempty"`
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// Identifies an entity that provides a preview of this object.
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Preview Item `jsonld:"preview,omitempty"`
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// The target resource pointed to by a Link.
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Href IRI `jsonld:"href,omitempty"`
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// Hints as to the language used by the target resource.
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// Value must be a [BCP47](https://tools.ietf.org/html/bcp47) Language-Tag.
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HrefLang LangRef `jsonld:"hrefLang,omitempty"`
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}
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// Mention is a specialized Link that represents an @mention.
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type Mention = Link
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// ValidLinkType validates a type against the valid link types
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func ValidLinkType(typ ActivityVocabularyType) bool {
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for _, v := range validLinkTypes {
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if v == typ {
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return true
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}
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}
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return false
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}
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// LinkNew initializes a new Link
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func LinkNew(id ID, typ ActivityVocabularyType) *Link {
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if !ValidLinkType(typ) {
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typ = LinkType
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}
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return &Link{ID: id, Type: typ}
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}
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// MentionNew initializes a new Mention
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func MentionNew(id ID) *Mention {
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return &Mention{ID: id, Type: MentionType}
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}
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// IsLink validates if current Link is a Link
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func (l Link) IsLink() bool {
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return l.Type == LinkType || ValidLinkType(l.Type)
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}
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// IsObject validates if current Link is an GetID
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func (l Link) IsObject() bool {
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return l.Type == ObjectType || ObjectTypes.Contains(l.Type)
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}
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// IsCollection returns false for Link objects
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func (l Link) IsCollection() bool {
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return false
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}
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// GetID returns the ID corresponding to the Link object
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func (l Link) GetID() ID {
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return l.ID
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}
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// GetLink returns the IRI corresponding to the current Link
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func (l Link) GetLink() IRI {
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return IRI(l.ID)
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}
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// GetType returns the Type corresponding to the Mention object
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func (l Link) GetType() ActivityVocabularyType {
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return l.Type
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}
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// UnmarshalJSON
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func (l *Link) UnmarshalJSON(data []byte) error {
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if ItemTyperFunc == nil {
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ItemTyperFunc = JSONGetItemByType
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}
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l.ID = JSONGetID(data)
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l.Type = JSONGetType(data)
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l.MediaType = JSONGetMimeType(data)
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l.Preview = JSONGetItem(data, "preview")
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l.Height = uint(JSONGetInt(data, "height"))
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l.Width = uint(JSONGetInt(data, "width"))
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l.Name = JSONGetNaturalLanguageField(data, "name")
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l.HrefLang = JSONGetLangRefField(data, "hrefLang")
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href := JSONGetURIItem(data, "href")
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if href != nil && !href.IsObject() {
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l.Href = href.GetLink()
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}
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rel := JSONGetURIItem(data, "rel")
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if rel != nil && !rel.IsObject() {
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l.Rel = rel.GetLink()
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}
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//fmt.Printf("%s\n %#v", data, l)
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return nil
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}
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