67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package streams
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import (
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"github.com/go-fed/activity/streams/vocab"
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)
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const (
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// jsonLDContext is the key for the JSON-LD specification's context
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// value. It contains the definitions of the types contained within the
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// rest of the payload. Important for linked-data representations, but
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// only applicable to go-fed at code-generation time.
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jsonLDContext = "@context"
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)
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// Serialize adds the context vocabularies contained within the type
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// into the JSON-LD @context field, and aliases them appropriately.
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func Serialize(a vocab.Type) (m map[string]interface{}, e error) {
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m, e = a.Serialize()
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if e != nil {
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return
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}
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v := a.JSONLDContext()
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// Transform the map of vocabulary-to-aliases into a context payload,
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// but do so in a way that at least keeps it readable for other humans.
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var contextValue interface{}
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if len(v) == 1 {
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for vocab, alias := range v {
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if len(alias) == 0 {
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contextValue = vocab
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} else {
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contextValue = map[string]string{
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alias: vocab,
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}
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}
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}
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} else {
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var arr []interface{}
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aliases := make(map[string]string)
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for vocab, alias := range v {
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if len(alias) == 0 {
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arr = append(arr, vocab)
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} else {
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aliases[alias] = vocab
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}
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}
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if len(aliases) > 0 {
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arr = append(arr, aliases)
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}
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contextValue = arr
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}
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// TODO: Update the context instead if it already exists
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m[jsonLDContext] = contextValue
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// TODO: Sort the context based on arbitrary order.
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// Delete any existing `@context` in child maps.
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var cleanFnRecur func(map[string]interface{})
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cleanFnRecur = func(r map[string]interface{}) {
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for _, v := range r {
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if n, ok := v.(map[string]interface{}); ok {
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delete(n, jsonLDContext)
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cleanFnRecur(n)
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}
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}
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}
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cleanFnRecur(m)
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return
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}
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