Add query parameter converters for complex types

* Add converter for URL query parameters of type map[string][]string
* Add converter for URL query parameters of type time.Time
* Added function to allocate and configure schema.Decoder for API use
* Updated API handlers to leverage new converters, and correct handler
  code for filter type

An encoding example for a client using filters:

  v := map[string][]string{
      "dangling": {"true"},
  }
  payload, err := jsoniter.MarshalToString(v)
  if err != nil {
    panic(err)
  }
  payload = "?filters=" + url.QueryEscape(payload)

Signed-off-by: Jhon Honce <jhonce@redhat.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/pkg/api/handlers/utils/images.go b/pkg/api/handlers/utils/images.go
index 9445298ca..a0d340471 100644
--- a/pkg/api/handlers/utils/images.go
+++ b/pkg/api/handlers/utils/images.go
@@ -15,17 +15,18 @@ func GetImages(w http.ResponseWriter, r *http.Request) ([]*image.Image, error) {
 	decoder := r.Context().Value("decoder").(*schema.Decoder)
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	query := struct {
-		//all     bool # all is currently unused
-		filters []string
-		//digests bool # digests is currently unused
+		// all     bool # all is currently unused
+		Filters map[string][]string `schema:"filters"`
+		// digests bool # digests is currently unused
 	}{
 		// This is where you can override the golang default value for one of fields
 	}
 	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
 		return nil, err
 	}
-	filters := query.filters
-	if len(filters) < 1 {
+
+	var filters = []string{}
+	if _, found := r.URL.Query()["filters"]; found {
 		filters = append(filters, fmt.Sprintf("reference=%s", ""))
 	}
 	return runtime.ImageRuntime().GetImagesWithFilters(filters)