426 lines
10 KiB
Go
426 lines
10 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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"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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// ItemTyperFunc will return an instance of a struct that implements activitystreams.Item
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// The default for this package is JSONGetItemByType but can be overwritten
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var ItemTyperFunc TyperFunction
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// TyperFunction is the type of the function which returns an activitystreams.Item struct instance
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// for a specific ActivityVocabularyType
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type TyperFunction func(ActivityVocabularyType) (Item, error)
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func JSONGetObjectID(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 JSONGetType(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 ""
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}
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return typ
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}
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func JSONGetMimeType(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 JSONGetInt(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 JSONGetFloat(data []byte, prop string) float64 {
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val, err := jsonparser.GetFloat(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 JSONGetString(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 JSONGetNaturalLanguageField(data []byte, prop string) NaturalLanguageValues {
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n := NaturalLanguageValues{}
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil || val == 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(val, func(key []byte, value []byte, dataType jsonparser.ValueType, offset int) error {
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if dataType == jsonparser.String {
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l := LangRefValue{}
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if err := l.UnmarshalJSON(value); err == nil {
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if l.Ref != NilLangRef || len(l.Value) > 0 {
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n = append(n, l)
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}
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}
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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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l := LangRefValue{}
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if err := l.UnmarshalJSON(val); err == nil {
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n = append(n, l)
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}
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}
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return n
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}
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func JSONGetTime(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 JSONGetDuration(data []byte, prop string) time.Duration {
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str, _ := jsonparser.GetUnsafeString(data, prop)
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d, _ := time.ParseDuration(str)
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return d
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}
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func itemFn(data []byte) (Item, error) {
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if len(data) == 0 {
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return nil, nil
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}
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i, err := ItemTyperFunc(JSONGetType(data))
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if err != nil || i == nil {
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if i, ok := asIRI(data); ok {
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// try to see if it's an IRI
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return i, nil
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}
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return nil, 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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return i, err
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}
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func JSONUnmarshalToItem(data []byte) Item {
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if len(data) == 0 {
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return nil
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}
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if ItemTyperFunc == nil {
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return nil
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}
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val, typ, _, err := jsonparser.Get(data)
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if err != nil || len(val) == 0 {
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return nil
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}
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var i Item
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switch typ {
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case jsonparser.Array:
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items := make(ItemCollection, 0)
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jsonparser.ArrayEach(data, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
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var it Item
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it, err = itemFn(value)
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if it != nil && err == nil {
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items.Append(it)
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}
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})
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if len(items) == 1 {
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i = items.First()
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}
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if len(items) > 1 {
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i = items
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}
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case jsonparser.Object:
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i, err = itemFn(data)
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case jsonparser.String:
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if iri, ok := asIRI(data); ok {
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// try to see if it's an IRI
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i = iri
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}
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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 asIRI(val []byte) (IRI, bool) {
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u, err := url.ParseRequestURI(string(val))
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if err == nil && len(u.Scheme) > 0 && len(u.Host) > 0 {
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// try to see if it's an IRI
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return IRI(val), true
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}
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return IRI(""), false
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}
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func JSONGetItem(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 i, ok := asIRI(val); ok {
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// try to see if it's an IRI
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return i
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}
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case jsonparser.Array:
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fallthrough
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case jsonparser.Object:
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return JSONUnmarshalToItem(val)
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case jsonparser.Number:
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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 JSONGetURIItem(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 JSONGetItem(data, prop)
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case jsonparser.Array:
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it := make(ItemCollection, 0)
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jsonparser.ArrayEach(val, func(value []byte, dataType jsonparser.ValueType, offset int, err error) {
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if i, ok := asIRI(value); ok {
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it.Append(i)
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return
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}
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i, err := ItemTyperFunc(JSONGetType(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 JSONGetItems(data []byte, prop string) ItemCollection {
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if len(data) == 0 {
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return nil
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}
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val, typ, _, err := jsonparser.Get(data, prop)
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if err != nil || len(val) == 0 {
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return nil
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}
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it := make(ItemCollection, 0)
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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 := itemFn(value)
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if i != nil && err == 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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// this should never happen :)
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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 JSONGetLangRefField(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(err.Error())
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}
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return LangRef(val)
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}
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func JSONGetIRI(data []byte, prop string) IRI {
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val, err := jsonparser.GetString(data, prop)
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if err != nil {
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return IRI("")
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}
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return IRI(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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if ItemTyperFunc == nil {
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ItemTyperFunc = JSONGetItemByType
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}
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return JSONUnmarshalToItem(data), nil
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}
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func JSONGetItemByType(typ ActivityVocabularyType) (Item, error) {
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switch typ {
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case ObjectType:
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return ObjectNew(typ), nil
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case LinkType:
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return &Link{Type: typ}, nil
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case ActivityType:
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return &Activity{Parent: Parent{Type: typ}}, nil
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case IntransitiveActivityType:
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return &IntransitiveActivity{Parent: Parent{Type: typ}}, nil
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case ActorType:
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return ObjectNew(typ), nil
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case CollectionType:
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return &Collection{Parent: Parent{Type: typ}}, nil
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case OrderedCollectionType:
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return &OrderedCollection{Parent: Parent{Type: typ}}, nil
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case CollectionPageType:
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return &CollectionPage{ParentCollection: ParentCollection{Parent: Parent{Type: typ}}}, nil
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case OrderedCollectionPageType:
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return &OrderedCollectionPage{OrderedCollection: OrderedCollection{Parent: Parent{Type: typ}}}, nil
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case ArticleType:
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return ObjectNew(typ), nil
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case AudioType:
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return ObjectNew(typ), nil
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case DocumentType:
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return ObjectNew(typ), nil
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case EventType:
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return ObjectNew(typ), nil
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case ImageType:
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return ObjectNew(typ), nil
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case NoteType:
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return ObjectNew(typ), nil
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case PageType:
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return ObjectNew(typ), nil
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case PlaceType:
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return &Place{Type: typ}, nil
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case ProfileType:
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return &Profile{Type: typ}, nil
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case RelationshipType:
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return &Relationship{Type: typ}, nil
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case TombstoneType:
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return &Tombstone{Type: typ}, nil
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case VideoType:
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return ObjectNew(typ), nil
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case MentionType:
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return &Mention{Type: typ}, nil
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case ApplicationType:
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return ObjectNew(typ), nil
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case GroupType:
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return ObjectNew(typ), nil
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case OrganizationType:
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return ObjectNew(typ), nil
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case PersonType:
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return ObjectNew(typ), nil
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case ServiceType:
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return ObjectNew(typ), nil
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case AcceptType:
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return &Accept{Parent: Parent{Type: typ}}, nil
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case AddType:
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return &Add{Parent: Parent{Type: typ}}, nil
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case AnnounceType:
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return &Announce{Parent: Parent{Type: typ}}, nil
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case ArriveType:
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return &Arrive{Parent: Parent{Type: typ}}, nil
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case BlockType:
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return &Block{Parent: Parent{Type: typ}}, nil
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case CreateType:
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return &Create{Parent: Parent{Type: typ}}, nil
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case DeleteType:
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return &Delete{Parent: Parent{Type: typ}}, nil
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case DislikeType:
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return &Dislike{Parent: Parent{Type: typ}}, nil
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case FlagType:
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return &Flag{Parent: Parent{Type: typ}}, nil
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case FollowType:
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return &Follow{Parent: Parent{Type: typ}}, nil
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case IgnoreType:
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return &Ignore{Parent: Parent{Type: typ}}, nil
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case InviteType:
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return &Invite{Parent: Parent{Type: typ}}, nil
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case JoinType:
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return &Join{Parent: Parent{Type: typ}}, nil
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case LeaveType:
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return &Leave{Parent: Parent{Type: typ}}, nil
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case LikeType:
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return &Like{Parent: Parent{Type: typ}}, nil
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case ListenType:
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return &Listen{Parent: Parent{Type: typ}}, nil
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case MoveType:
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return &Move{Parent: Parent{Type: typ}}, nil
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case OfferType:
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return &Offer{Parent: Parent{Type: typ}}, nil
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case QuestionType:
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return &Question{Type: typ}, nil
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case RejectType:
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return &Reject{Parent: Parent{Type: typ}}, nil
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case ReadType:
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return &Read{Parent: Parent{Type: typ}}, nil
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case RemoveType:
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return &Remove{Parent: Parent{Type: typ}}, nil
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case TentativeRejectType:
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return &TentativeReject{Parent: Parent{Type: typ}}, nil
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case TentativeAcceptType:
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return &TentativeAccept{Parent: Parent{Type: typ}}, nil
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case TravelType:
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return &Travel{Parent: Parent{Type: typ}}, nil
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case UndoType:
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return &Undo{Parent: Parent{Type: typ}}, nil
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case UpdateType:
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return &Update{Parent: Parent{Type: typ}}, nil
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case ViewType:
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return &View{Parent: Parent{Type: typ}}, nil
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case "":
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// when no type is available use a plain Object
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return nil, nil
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}
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return nil, fmt.Errorf("unrecognized ActivityStreams type %s", typ)
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}
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