549 lines
11 KiB
Go
549 lines
11 KiB
Go
package activitystreams
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import (
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"encoding"
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"encoding/json"
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"fmt"
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"net/url"
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"reflect"
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"strings"
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"time"
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"github.com/buger/jsonparser"
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)
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var (
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apUnmarshalerType = reflect.TypeOf(new(Item)).Elem()
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unmarshalerType = reflect.TypeOf(new(json.Unmarshaler)).Elem()
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textUnmarshalerType = reflect.TypeOf(new(encoding.TextUnmarshaler)).Elem()
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)
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type mockObj map[string]json.RawMessage
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func getType(j json.RawMessage) ActivityVocabularyType {
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mock := make(mockObj, 0)
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json.Unmarshal([]byte(j), &mock)
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for key, val := range mock {
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if strings.ToLower(key) == "type" {
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return ActivityVocabularyType(strings.Trim(string(val), "\""))
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}
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}
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return ""
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}
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func getAPObjectID(data []byte) ObjectID {
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i, err := jsonparser.GetString(data, "id")
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if err != nil {
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return ObjectID("")
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}
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return ObjectID(i)
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}
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func getAPType(data []byte) ActivityVocabularyType {
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t, err := jsonparser.GetString(data, "type")
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typ := ActivityVocabularyType(t)
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if err != nil {
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return ActivityVocabularyType("")
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}
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return typ
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}
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func getAPMimeType(data []byte) MimeType {
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t, err := jsonparser.GetString(data, "mediaType")
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if err != nil {
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return MimeType("")
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}
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return MimeType(t)
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}
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func getAPInt(data []byte, prop string) int64 {
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val, err := jsonparser.GetInt(data, prop)
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if err != nil {
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}
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return val
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}
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func getAPString(data []byte, prop string) string {
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val, err := jsonparser.GetString(data, prop)
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if err != nil {
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}
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return val
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}
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func getAPNaturalLanguageField(data []byte, prop string) NaturalLanguageValue {
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n := NaturalLanguageValue{}
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil {
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return nil
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}
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switch typ {
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case jsonparser.Object:
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jsonparser.ObjectEach(data, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
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if dataType == jsonparser.String {
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n.Append(LangRef(key), string(value))
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}
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return err
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})
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case jsonparser.String:
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n.Append(NilLangRef, string(val))
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}
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return n
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}
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func getAPTime(data []byte, prop string) time.Time {
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t := time.Time{}
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str, _ := jsonparser.GetUnsafeString(data, prop)
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t.UnmarshalText([]byte(str))
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return t
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}
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func unmarshalToAPObject(data []byte) Item {
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if _, err := url.ParseRequestURI(string(data)); err == nil {
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// try to see if it's an IRI
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return IRI(data)
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}
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i, err := getAPObjectByType(getAPType(data))
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if err != nil {
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return nil
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}
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p := reflect.PtrTo(reflect.TypeOf(i))
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if reflect.TypeOf(i).Implements(unmarshalerType) || p.Implements(unmarshalerType) {
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err = i.(json.Unmarshaler).UnmarshalJSON(data)
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}
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if reflect.TypeOf(i).Implements(textUnmarshalerType) || p.Implements(textUnmarshalerType) {
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err = i.(encoding.TextUnmarshaler).UnmarshalText(data)
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}
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if err != nil {
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return nil
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}
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return i
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}
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func getAPItem(data []byte, prop string) Item {
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil {
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return nil
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}
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switch typ {
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case jsonparser.String:
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if _, err = url.ParseRequestURI(string(val)); err == nil {
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// try to see if it's an IRI
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return IRI(val)
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}
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case jsonparser.Object:
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return unmarshalToAPObject(val)
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case jsonparser.Number:
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fallthrough
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case jsonparser.Array:
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fallthrough
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case jsonparser.Boolean:
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fallthrough
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case jsonparser.Null:
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fallthrough
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case jsonparser.Unknown:
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fallthrough
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default:
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return nil
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}
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return nil
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}
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func getAPItems(data []byte, prop string) ItemCollection {
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil {
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return nil
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}
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var it ItemCollection
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switch typ {
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case jsonparser.Array:
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jsonparser.ArrayEach(data, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
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var i Item
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switch dataType {
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case jsonparser.String:
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if _, err = url.ParseRequestURI(string(val)); err == nil {
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// try to see if it's an IRI
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i = IRI(value)
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}
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case jsonparser.Object:
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i = unmarshalToAPObject(value)
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case jsonparser.Number:
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fallthrough
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case jsonparser.Array:
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fallthrough
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case jsonparser.Boolean:
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fallthrough
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case jsonparser.Null:
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fallthrough
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case jsonparser.Unknown:
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fallthrough
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default:
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return
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}
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if err != nil {
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return
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}
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if i != nil {
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it.Append(i)
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}
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}, prop)
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case jsonparser.Object:
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jsonparser.ObjectEach(data, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
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i := unmarshalToAPObject(value)
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if i != nil {
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it.Append(i)
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}
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return err
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}, prop)
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case jsonparser.String:
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s, _ := jsonparser.GetString(val)
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it.Append(IRI(s))
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}
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return it
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}
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func getAPItemCollection(data []byte, prop string) ItemCollection {
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil {
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return nil
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}
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var it ItemCollection
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switch typ {
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case jsonparser.Array:
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jsonparser.ArrayEach(data, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
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i, err := getAPObjectByType(getAPType(value))
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if err != nil {
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return
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}
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err = i.(json.Unmarshaler).UnmarshalJSON(value)
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if err != nil {
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return
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}
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it.Append(i)
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}, prop)
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case jsonparser.Object:
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jsonparser.ObjectEach(data, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
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i := Object{}
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err := i.UnmarshalJSON(val)
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it.Append(i)
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return err
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}, prop)
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case jsonparser.String:
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it.Append(IRI(val))
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}
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return it
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}
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func getURIField(data []byte, prop string) Item {
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil {
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return nil
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}
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switch typ {
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case jsonparser.Object:
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return getAPItem(data, prop)
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case jsonparser.Array:
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var it ItemCollection
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jsonparser.ArrayEach(val, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
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if _, err := url.Parse(string(value)); err == nil {
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it.Append(IRI(value))
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return
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}
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i, err := getAPObjectByType(getAPType(value))
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if err != nil {
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return
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}
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err = i.(json.Unmarshaler).UnmarshalJSON(value)
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if err != nil {
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return
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}
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it.Append(i)
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})
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return it
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case jsonparser.String:
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return IRI(val)
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}
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return nil
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}
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func getAPLangRefField(data []byte, prop string) LangRef {
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val, err := jsonparser.GetString(data, prop)
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if err != nil {
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return LangRef("")
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}
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return LangRef(val)
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}
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// UnmarshalJSON tries to detect the type of the object in the json data and then outputs a matching
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// ActivityStreams object, if possible
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func UnmarshalJSON(data []byte) (Item, error) {
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return unmarshalToAPObject(data), nil
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}
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/*
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func unmarshal(data []byte, a interface{}) (interface{}, error) {
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ta := make(mockObj, 0)
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err := jsonld.Unmarshal(data, &ta)
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if err != nil {
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return nil, err
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}
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typ := reflect.TypeOf(a)
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val := reflect.ValueOf(a)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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val = val.Elem()
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}
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for i := 0; i < typ.NumField(); i++ {
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cField := typ.Field(i)
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cValue := val.Field(i)
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cTag := cField.Tag
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tag, _ := jsonld.LoadTag(cTag)
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var vv reflect.Value
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for key, j := range ta {
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if j == nil {
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continue
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}
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if key == tag.Name {
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if cField.Type.Implements(textUnmarshalerType) {
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m, _ := cValue.Interface().(encoding.TextUnmarshaler)
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m.UnmarshalText(j)
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vv = reflect.ValueOf(m)
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}
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if cField.Type.Implements(unmarshalerType) {
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m, _ := cValue.Interface().(json.Unmarshaler)
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m.UnmarshalJSON(j)
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vv = reflect.ValueOf(m)
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}
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if cField.Type.Implements(apUnmarshalerType) {
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o := getAPObjectByType(getType(j))
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if o != nil {
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jsonld.Unmarshal([]byte(j), o)
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vv = reflect.ValueOf(o)
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}
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}
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}
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if vv.CanAddr() {
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cValue.Set(vv)
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fmt.Printf("\n\nReflected %q %q => %#v\n\n%#v\n", cField.Name, cField.Type, vv, tag.Name)
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}
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}
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}
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return a, nil
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}
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*/
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func getAPObjectByType(typ ActivityVocabularyType) (Item, error) {
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var ret Item
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var err error
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switch typ {
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case ObjectType:
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ret = ObjectNew(typ)
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case LinkType:
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ret = &Link{}
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o := ret.(*Link)
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o.Type = typ
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case ActivityType:
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ret = &Activity{}
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o := ret.(*Activity)
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o.Type = typ
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case IntransitiveActivityType:
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ret = &IntransitiveActivity{}
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o := ret.(*IntransitiveActivity)
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o.Type = typ
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case ActorType:
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ret = &Actor{}
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o := ret.(*Actor)
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o.Type = typ
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case CollectionType:
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ret = &Collection{}
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o := ret.(*Collection)
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o.Type = typ
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case OrderedCollectionType:
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ret = &Link{}
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o := ret.(*Link)
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o.Type = typ
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case ArticleType:
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ret = ObjectNew(typ)
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case AudioType:
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ret = ObjectNew(typ)
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case DocumentType:
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ret = ObjectNew(typ)
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case EventType:
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o := Object{}
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o.Type = typ
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case ImageType:
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ret = ObjectNew(typ)
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o := ret.(*Object)
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o.Type = typ
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case NoteType:
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ret = ObjectNew(typ)
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case PageType:
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ret = ObjectNew(typ)
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case PlaceType:
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ret = ObjectNew(typ)
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case ProfileType:
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ret = ObjectNew(typ)
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case RelationshipType:
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ret = ObjectNew(typ)
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case TombstoneType:
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ret = ObjectNew(typ)
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case VideoType:
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ret = ObjectNew(typ)
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case MentionType:
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ret = &Mention{}
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o := ret.(*Mention)
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o.Type = typ
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case ApplicationType:
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ret = &Application{}
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o := ret.(*Application)
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o.Type = typ
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case GroupType:
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ret = &Group{}
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o := ret.(*Group)
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o.Type = typ
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case OrganizationType:
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ret = &Organization{}
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o := ret.(*Organization)
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o.Type = typ
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case PersonType:
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ret = &Person{}
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o := ret.(*Person)
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o.Type = typ
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case ServiceType:
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ret = &Service{}
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o := ret.(*Service)
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o.Type = typ
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case AcceptType:
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ret = &Accept{}
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o := ret.(*Accept)
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o.Type = typ
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case AddType:
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ret = &Add{}
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o := ret.(*Add)
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o.Type = typ
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case AnnounceType:
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ret = &Announce{}
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o := ret.(*Announce)
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o.Type = typ
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case ArriveType:
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ret = &Arrive{}
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o := ret.(*Arrive)
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o.Type = typ
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case BlockType:
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ret = &Block{}
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o := ret.(*Block)
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o.Type = typ
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case CreateType:
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ret = &Create{}
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o := ret.(*Create)
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o.Type = typ
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case DeleteType:
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ret = &Delete{}
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o := ret.(*Delete)
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o.Type = typ
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case DislikeType:
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ret = &Dislike{}
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o := ret.(*Dislike)
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o.Type = typ
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case FlagType:
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ret = &Flag{}
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o := ret.(*Flag)
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o.Type = typ
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case FollowType:
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ret = &Follow{}
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o := ret.(*Follow)
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o.Type = typ
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case IgnoreType:
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ret = &Ignore{}
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o := ret.(*Ignore)
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o.Type = typ
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case InviteType:
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ret = &Invite{}
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o := ret.(*Invite)
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o.Type = typ
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case JoinType:
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ret = &Join{}
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o := ret.(*Join)
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o.Type = typ
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case LeaveType:
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ret = &Leave{}
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o := ret.(*Leave)
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o.Type = typ
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case LikeType:
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ret = &Like{}
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o := ret.(*Like)
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o.Type = typ
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case ListenType:
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ret = &Listen{}
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o := ret.(*Listen)
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o.Type = typ
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case MoveType:
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ret = &Move{}
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o := ret.(*Move)
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o.Type = typ
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case OfferType:
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ret = &Offer{}
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o := ret.(*Offer)
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o.Type = typ
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case QuestionType:
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ret = &Question{}
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o := ret.(*Question)
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o.Type = typ
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case RejectType:
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ret = &Reject{}
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o := ret.(*Reject)
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o.Type = typ
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case ReadType:
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ret = &Read{}
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o := ret.(*Read)
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o.Type = typ
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case RemoveType:
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ret = &Remove{}
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o := ret.(*Remove)
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o.Type = typ
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case TentativeRejectType:
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ret = &TentativeReject{}
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o := ret.(*TentativeReject)
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o.Type = typ
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case TentativeAcceptType:
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ret = &TentativeAccept{}
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o := ret.(*TentativeAccept)
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o.Type = typ
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case TravelType:
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ret = &Travel{}
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o := ret.(*Travel)
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o.Type = typ
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case UndoType:
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ret = &Undo{}
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o := ret.(*Undo)
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o.Type = typ
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case UpdateType:
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ret = &Update{}
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o := ret.(*Update)
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o.Type = typ
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case ViewType:
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ret = &View{}
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o := ret.(*View)
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o.Type = typ
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case "":
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// when no type is available use a plain Object
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ret = &Object{}
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default:
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ret = nil
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err = fmt.Errorf("unrecognized ActivityPub type %q", typ)
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}
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return ret, err
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}
|