move to ssb gofed fork (#298)

vendor/github.com/go-fed/activity/streams/util.go

@@ -1,66 +0,0 @@
-package streams
-
-import (
-	"github.com/go-fed/activity/streams/vocab"
-)
-
-const (
-	// jsonLDContext is the key for the JSON-LD specification's context
-	// value. It contains the definitions of the types contained within the
-	// rest of the payload. Important for linked-data representations, but
-	// only applicable to go-fed at code-generation time.
-	jsonLDContext = "@context"
-)
-
-// Serialize adds the context vocabularies contained within the type
-// into the JSON-LD @context field, and aliases them appropriately.
-func Serialize(a vocab.Type) (m map[string]interface{}, e error) {
-	m, e = a.Serialize()
-	if e != nil {
-		return
-	}
-	v := a.JSONLDContext()
-	// Transform the map of vocabulary-to-aliases into a context payload,
-	// but do so in a way that at least keeps it readable for other humans.
-	var contextValue interface{}
-	if len(v) == 1 {
-		for vocab, alias := range v {
-			if len(alias) == 0 {
-				contextValue = vocab
-			} else {
-				contextValue = map[string]string{
-					alias: vocab,
-				}
-			}
-		}
-	} else {
-		var arr []interface{}
-		aliases := make(map[string]string)
-		for vocab, alias := range v {
-			if len(alias) == 0 {
-				arr = append(arr, vocab)
-			} else {
-				aliases[alias] = vocab
-			}
-		}
-		if len(aliases) > 0 {
-			arr = append(arr, aliases)
-		}
-		contextValue = arr
-	}
-	// TODO: Update the context instead if it already exists
-	m[jsonLDContext] = contextValue
-	// TODO: Sort the context based on arbitrary order.
-	// Delete any existing `@context` in child maps.
-	var cleanFnRecur func(map[string]interface{})
-	cleanFnRecur = func(r map[string]interface{}) {
-		for _, v := range r {
-			if n, ok := v.(map[string]interface{}); ok {
-				delete(n, jsonLDContext)
-				cleanFnRecur(n)
-			}
-		}
-	}
-	cleanFnRecur(m)
-	return
-}