podman network label support

Add label support for podman network create. Use the `args`
field in the cni config file to store the podman labels.
Use `podman_labels` as key name and store the labels as
map[string]string.

For reference: https://github.com/containernetworking/cni/blob/master/CONVENTIONS.md#args-in-network-config
https://github.com/containernetworking/cni/blob/spec-v0.4.0/SPEC.md#network-configuration

Example snippet:

```
...
"args": {
	"podman_labels": {
		"key1":"value1",
		"key2":"value2"
	}
}
...
```

Make podman network list support several filters. Supported filters are name,
plugin, driver and label. Filters with different keys work exclusive. Several label
filters work exclusive and the other filter keys are working inclusive.

Also adjust the compat api to support labels in network create and list.

Breaking changes:

- podman network ls -f shortform is used for --filter instead --format
This matches docker and other podman commands (container ps, volume ps)

- libpod network list endpoint filter parameter is removed. Instead the
filters paramter should be used as json encoded map[string][]string.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

3 files changed, 34 insertions, 32 deletions

diff --git a/pkg/api/handlers/compat/networks.go b/pkg/api/handlers/compat/networks.go
index c74cdb840..762f88a68 100644
--- a/pkg/api/handlers/compat/networks.go
+++ b/pkg/api/handlers/compat/networks.go
@@ -50,7 +50,7 @@ func InspectNetwork(w http.ResponseWriter, r *http.Request) {
 		utils.NetworkNotFound(w, name, err)
 		return
 	}
-	report, err := getNetworkResourceByName(name, runtime)
+	report, err := getNetworkResourceByName(name, runtime, nil)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return
@@ -58,7 +58,7 @@ func InspectNetwork(w http.ResponseWriter, r *http.Request) {
 	utils.WriteResponse(w, http.StatusOK, report)
 }
 
-func getNetworkResourceByName(name string, runtime *libpod.Runtime) (*types.NetworkResource, error) {
+func getNetworkResourceByName(name string, runtime *libpod.Runtime, filters map[string][]string) (*types.NetworkResource, error) {
 	var (
 		ipamConfigs []dockerNetwork.IPAMConfig
 	)
@@ -85,6 +85,16 @@ func getNetworkResourceByName(name string, runtime *libpod.Runtime) (*types.Netw
 	if err != nil {
 		return nil, err
 	}
+	if len(filters) > 0 {
+		ok, err := network.IfPassesFilter(conf, filters)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			// do not return the config if we did not match the filter
+			return nil, nil
+		}
+	}
 
 	// No Bridge plugin means we bail
 	bridge, err := genericPluginsToBridge(conf.Plugins, network.DefaultNetworkDriver)
@@ -129,14 +139,14 @@ func getNetworkResourceByName(name string, runtime *libpod.Runtime) (*types.Netw
 			Options: nil,
 			Config:  ipamConfigs,
 		},
-		Internal:   false,
+		Internal:   !bridge.IsGW,
 		Attachable: false,
 		Ingress:    false,
 		ConfigFrom: dockerNetwork.ConfigReference{},
 		ConfigOnly: false,
 		Containers: containerEndpoints,
 		Options:    nil,
-		Labels:     nil,
+		Labels:     network.GetNetworkLabels(conf),
 		Peers:      nil,
 		Services:   nil,
 	}
@@ -180,41 +190,23 @@ func ListNetworks(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	filterNames, nameFilterExists := query.Filters["name"]
-	// TODO remove when filters are implemented
-	if (!nameFilterExists && len(query.Filters) > 0) || len(query.Filters) > 1 {
-		utils.InternalServerError(w, errors.New("only the name filter for listing networks is implemented"))
-		return
-	}
 	netNames, err := network.GetNetworkNamesFromFileSystem(config)
 	if err != nil {
 		utils.InternalServerError(w, err)
 		return
 	}
 
-	// filter by name
-	if nameFilterExists {
-		names := []string{}
-		for _, name := range netNames {
-			for _, filter := range filterNames {
-				if strings.Contains(name, filter) {
-					names = append(names, name)
-					break
-				}
-			}
-		}
-		netNames = names
-	}
-
-	reports := make([]*types.NetworkResource, 0, len(netNames))
+	var reports []*types.NetworkResource
 	logrus.Errorf("netNames: %q", strings.Join(netNames, ", "))
 	for _, name := range netNames {
-		report, err := getNetworkResourceByName(name, runtime)
+		report, err := getNetworkResourceByName(name, runtime, query.Filters)
 		if err != nil {
 			utils.InternalServerError(w, err)
 			return
 		}
-		reports = append(reports, report)
+		if report != nil {
+			reports = append(reports, report)
+		}
 	}
 	utils.WriteResponse(w, http.StatusOK, reports)
 }
@@ -245,6 +237,7 @@ func CreateNetwork(w http.ResponseWriter, r *http.Request) {
 	ncOptions := entities.NetworkCreateOptions{
 		Driver:   network.DefaultNetworkDriver,
 		Internal: networkCreate.Internal,
+		Labels:   networkCreate.Labels,
 	}
 	if networkCreate.IPAM != nil && networkCreate.IPAM.Config != nil {
 		if len(networkCreate.IPAM.Config) > 1 {
diff --git a/pkg/api/handlers/libpod/networks.go b/pkg/api/handlers/libpod/networks.go
index f1578f829..8511e2733 100644
--- a/pkg/api/handlers/libpod/networks.go
+++ b/pkg/api/handlers/libpod/networks.go
@@ -48,7 +48,7 @@ func ListNetworks(w http.ResponseWriter, r *http.Request) {
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	decoder := r.Context().Value("decoder").(*schema.Decoder)
 	query := struct {
-		Filter string `schema:"filter"`
+		Filters map[string][]string `schema:"filters"`
 	}{
 		// override any golang type defaults
 	}
@@ -59,7 +59,7 @@ func ListNetworks(w http.ResponseWriter, r *http.Request) {
 	}
 
 	options := entities.NetworkListOptions{
-		Filter: query.Filter,
+		Filters: query.Filters,
 	}
 	ic := abi.ContainerEngine{Libpod: runtime}
 	reports, err := ic.NetworkList(r.Context(), options)
diff --git a/pkg/api/server/register_networks.go b/pkg/api/server/register_networks.go
index ea169cbdf..193b05e6d 100644
--- a/pkg/api/server/register_networks.go
+++ b/pkg/api/server/register_networks.go
@@ -65,7 +65,11 @@ func (s *APIServer) registerNetworkHandlers(r *mux.Router) error {
 	//  - in: query
 	//    name: filters
 	//    type: string
-	//    description: JSON encoded value of the filters (a map[string][]string) to process on the networks list. Only the name filter is supported.
+	//    description: |
+	//      JSON encoded value of the filters (a map[string][]string) to process on the network list. Currently available filters:
+	//        - name=[name] Matches network name (accepts regex).
+	//        - driver=[driver] Only bridge is supported.
+	//        - label=[key] or label=[key=value] Matches networks based on the presence of a label alone or a label and a value.
 	// produces:
 	// - application/json
 	// responses:
@@ -216,9 +220,14 @@ func (s *APIServer) registerNetworkHandlers(r *mux.Router) error {
 	// description: Display summary of network configurations
 	// parameters:
 	//  - in: query
-	//    name: filter
+	//    name: filters
 	//    type: string
-	//    description: Provide filter values (e.g. 'name=podman')
+	//    description: |
+	//      JSON encoded value of the filters (a map[string][]string) to process on the network list. Available filters:
+	//        - name=[name] Matches network name (accepts regex).
+	//        - driver=[driver] Only bridge is supported.
+	//        - label=[key] or label=[key=value] Matches networks based on the presence of a label alone or a label and a value.
+	//        - plugin=[plugin] Matches CNI plugins included in a network (e.g `bridge`,`portmap`,`firewall`,`tuning`,`dnsname`,`macvlan`)
 	// produces:
 	// - application/json
 	// responses: