podmanV2: implement search

Also implement a new libpod endpoint to add more parameters and to
prevent us from converting between slices and maps and make use of
the filter parsing in the image backend.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

11 files changed, 324 insertions, 55 deletions

diff --git a/cmd/podmanV2/images/search.go b/cmd/podmanV2/images/search.go
new file mode 100644
index 000000000..2ab9735ec
--- /dev/null
+++ b/cmd/podmanV2/images/search.go
@@ -0,0 +1,157 @@
+package images
+
+import (
+	"reflect"
+	"strings"
+
+	buildahcli "github.com/containers/buildah/pkg/cli"
+	"github.com/containers/buildah/pkg/formats"
+	"github.com/containers/image/v5/types"
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/containers/libpod/pkg/util/camelcase"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+// searchOptionsWrapper wraps entities.ImagePullOptions and prevents leaking
+// CLI-only fields into the API types.
+type searchOptionsWrapper struct {
+	entities.ImageSearchOptions
+	// CLI only flags
+	TLSVerifyCLI bool   // Used to convert to an optional bool later
+	Format       string // For go templating
+}
+
+var (
+	searchOptions     = searchOptionsWrapper{}
+	searchDescription = `Search registries for a given image. Can search all the default registries or a specific registry.
+
+	Users can limit the number of results, and filter the output based on certain conditions.`
+
+	// Command: podman search
+	searchCmd = &cobra.Command{
+		Use:     "search [flags] TERM",
+		Short:   "Search registry for image",
+		Long:    searchDescription,
+		PreRunE: preRunE,
+		RunE:    imageSearch,
+		Args:    cobra.ExactArgs(1),
+		Example: `podman search --filter=is-official --limit 3 alpine
+  podman search registry.fedoraproject.org/  # only works with v2 registries
+  podman search --format "table {{.Index}} {{.Name}}" registry.fedoraproject.org/fedora`,
+	}
+
+	// Command: podman image search
+	imageSearchCmd = &cobra.Command{
+		Use:     searchCmd.Use,
+		Short:   searchCmd.Short,
+		Long:    searchCmd.Long,
+		PreRunE: searchCmd.PreRunE,
+		RunE:    searchCmd.RunE,
+		Args:    searchCmd.Args,
+		Example: `podman image search --filter=is-official --limit 3 alpine
+		podman image search registry.fedoraproject.org/  # only works with v2 registries
+		podman image search --format "table {{.Index}} {{.Name}}" registry.fedoraproject.org/fedora`,
+	}
+)
+
+func init() {
+	// search
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: searchCmd,
+	})
+
+	searchCmd.SetHelpTemplate(registry.HelpTemplate())
+	searchCmd.SetUsageTemplate(registry.UsageTemplate())
+	flags := searchCmd.Flags()
+	searchFlags(flags)
+
+	// images search
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: imageSearchCmd,
+		Parent:  imageCmd,
+	})
+
+	imageSearchFlags := imageSearchCmd.Flags()
+	searchFlags(imageSearchFlags)
+}
+
+// searchFlags set the flags for the pull command.
+func searchFlags(flags *pflag.FlagSet) {
+	flags.StringSliceVarP(&searchOptions.Filters, "filter", "f", []string{}, "Filter output based on conditions provided (default [])")
+	flags.StringVar(&searchOptions.Format, "format", "", "Change the output format to a Go template")
+	flags.IntVar(&searchOptions.Limit, "limit", 0, "Limit the number of results")
+	flags.BoolVar(&searchOptions.NoTrunc, "no-trunc", false, "Do not truncate the output")
+	flags.StringVar(&searchOptions.Authfile, "authfile", buildahcli.GetDefaultAuthFile(), "Path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	flags.BoolVar(&searchOptions.TLSVerifyCLI, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries")
+	if registry.IsRemote() {
+		_ = flags.MarkHidden("authfile")
+		_ = flags.MarkHidden("tls-verify")
+	}
+}
+
+// imageSearch implements the command for searching images.
+func imageSearch(cmd *cobra.Command, args []string) error {
+	searchTerm := ""
+	switch len(args) {
+	case 1:
+		searchTerm = args[0]
+	default:
+		return errors.Errorf("search requires exactly one argument")
+	}
+
+	sarchOptsAPI := searchOptions.ImageSearchOptions
+	// TLS verification in c/image is controlled via a `types.OptionalBool`
+	// which allows for distinguishing among set-true, set-false, unspecified
+	// which is important to implement a sane way of dealing with defaults of
+	// boolean CLI flags.
+	if cmd.Flags().Changed("tls-verify") {
+		sarchOptsAPI.TLSVerify = types.NewOptionalBool(pullOptions.TLSVerifyCLI)
+	}
+
+	searchReport, err := registry.ImageEngine().Search(registry.GetContext(), searchTerm, sarchOptsAPI)
+	if err != nil {
+		return err
+	}
+
+	format := genSearchFormat(searchOptions.Format)
+	if len(searchReport) == 0 {
+		return nil
+	}
+	out := formats.StdoutTemplateArray{Output: searchToGeneric(searchReport), Template: format, Fields: searchHeaderMap()}
+	return out.Out()
+}
+
+// searchHeaderMap returns the headers of a SearchResult.
+func searchHeaderMap() map[string]string {
+	s := new(entities.ImageSearchReport)
+	v := reflect.Indirect(reflect.ValueOf(s))
+	values := make(map[string]string, v.NumField())
+
+	for i := 0; i < v.NumField(); i++ {
+		key := v.Type().Field(i).Name
+		value := key
+		values[key] = strings.ToUpper(strings.Join(camelcase.Split(value), " "))
+	}
+	return values
+}
+
+func genSearchFormat(format string) string {
+	if format != "" {
+		// "\t" from the command line is not being recognized as a tab
+		// replacing the string "\t" to a tab character if the user passes in "\t"
+		return strings.Replace(format, `\t`, "\t", -1)
+	}
+	return "table {{.Index}}\t{{.Name}}\t{{.Description}}\t{{.Stars}}\t{{.Official}}\t{{.Automated}}\t"
+}
+
+func searchToGeneric(params []entities.ImageSearchReport) (genericParams []interface{}) {
+	for _, v := range params {
+		genericParams = append(genericParams, interface{}(v))
+	}
+	return genericParams
+}
diff --git a/pkg/api/handlers/compat/images_search.go b/pkg/api/handlers/compat/images_search.go
index 7283b22c4..8da685527 100644
--- a/pkg/api/handlers/compat/images_search.go
+++ b/pkg/api/handlers/compat/images_search.go
@@ -57,6 +57,7 @@ func SearchImages(w http.ResponseWriter, r *http.Request) {
 		Filter: filter,
 		Limit:  query.Limit,
 	}
+
 	results, err := image.SearchImages(query.Term, options)
 	if err != nil {
 		utils.BadRequest(w, "term", query.Term, err)
diff --git a/pkg/api/handlers/libpod/images.go b/pkg/api/handlers/libpod/images.go
index 850de4598..a42d06205 100644
--- a/pkg/api/handlers/libpod/images.go
+++ b/pkg/api/handlers/libpod/images.go
@@ -645,3 +645,56 @@ func UntagImage(w http.ResponseWriter, r *http.Request) {
 	}
 	utils.WriteResponse(w, http.StatusCreated, "")
 }
+
+func SearchImages(w http.ResponseWriter, r *http.Request) {
+	decoder := r.Context().Value("decoder").(*schema.Decoder)
+	query := struct {
+		Term      string   `json:"term"`
+		Limit     int      `json:"limit"`
+		Filters   []string `json:"filters"`
+		TLSVerify bool     `json:"tlsVerify"`
+	}{
+		// This is where you can override the golang default value for one of fields
+	}
+
+	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
+		return
+	}
+
+	options := image.SearchOptions{
+		Limit: query.Limit,
+	}
+	if _, found := r.URL.Query()["tlsVerify"]; found {
+		options.InsecureSkipTLSVerify = types.NewOptionalBool(!query.TLSVerify)
+	}
+
+	if _, found := r.URL.Query()["filters"]; found {
+		filter, err := image.ParseSearchFilter(query.Filters)
+		if err != nil {
+			utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse filters parameter for %s", r.URL.String()))
+			return
+		}
+		options.Filter = *filter
+	}
+
+	searchResults, err := image.SearchImages(query.Term, options)
+	if err != nil {
+		utils.BadRequest(w, "term", query.Term, err)
+		return
+	}
+	// Convert from image.SearchResults to entities.ImageSearchReport. We don't
+	// want to leak any low-level packages into the remote client, which
+	// requires converting.
+	reports := make([]entities.ImageSearchReport, len(searchResults))
+	for i := range searchResults {
+		reports[i].Index = searchResults[i].Index
+		reports[i].Name = searchResults[i].Name
+		reports[i].Description = searchResults[i].Index
+		reports[i].Stars = searchResults[i].Stars
+		reports[i].Official = searchResults[i].Official
+		reports[i].Automated = searchResults[i].Automated
+	}
+
+	utils.WriteResponse(w, http.StatusOK, reports)
+}
diff --git a/pkg/api/server/register_images.go b/pkg/api/server/register_images.go
index 77560e789..7dd887037 100644
--- a/pkg/api/server/register_images.go
+++ b/pkg/api/server/register_images.go
@@ -919,7 +919,7 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	//      $ref: "#/responses/DocsSearchResponse"
 	//   500:
 	//      $ref: '#/responses/InternalError'
-	r.Handle(VersionedPath("/libpod/images/search"), s.APIHandler(compat.SearchImages)).Methods(http.MethodGet)
+	r.Handle(VersionedPath("/libpod/images/search"), s.APIHandler(libpod.SearchImages)).Methods(http.MethodGet)
 	// swagger:operation DELETE /libpod/images/{name:.*} libpod libpodRemoveImage
 	// ---
 	// tags:
diff --git a/pkg/bindings/images/images.go b/pkg/bindings/images/images.go
index 1b3df609b..3550c3968 100644
--- a/pkg/bindings/images/images.go
+++ b/pkg/bindings/images/images.go
@@ -2,7 +2,6 @@ package images
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -13,6 +12,7 @@ import (
 	"github.com/containers/libpod/pkg/api/handlers"
 	"github.com/containers/libpod/pkg/bindings"
 	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/pkg/errors"
 )
 
 // Exists a lightweight way to determine if an image exists in local storage.  It returns a
@@ -308,3 +308,34 @@ func Push(ctx context.Context, source string, destination string, options entiti
 	_, err = conn.DoRequest(nil, http.MethodPost, path, params)
 	return err
 }
+
+// Search is the binding for libpod's v2 endpoints for Search images.
+func Search(ctx context.Context, term string, opts entities.ImageSearchOptions) ([]entities.ImageSearchReport, error) {
+	conn, err := bindings.GetClient(ctx)
+	if err != nil {
+		return nil, err
+	}
+	params := url.Values{}
+	params.Set("term", term)
+	params.Set("limit", strconv.Itoa(opts.Limit))
+	for _, f := range opts.Filters {
+		params.Set("filters", f)
+	}
+
+	if opts.TLSVerify != types.OptionalBoolUndefined {
+		val := bool(opts.TLSVerify == types.OptionalBoolTrue)
+		params.Set("tlsVerify", strconv.FormatBool(val))
+	}
+
+	response, err := conn.DoRequest(nil, http.MethodGet, "/images/search", params)
+	if err != nil {
+		return nil, err
+	}
+
+	results := []entities.ImageSearchReport{}
+	if err := response.Process(&results); err != nil {
+		return nil, err
+	}
+
+	return results, nil
+}
diff --git a/pkg/bindings/images/search.go b/pkg/bindings/images/search.go
deleted file mode 100644
index 183ff3d77..000000000
--- a/pkg/bindings/images/search.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package images
-
-import (
-	"context"
-	"net/http"
-	"net/url"
-	"strconv"
-
-	"github.com/containers/libpod/libpod/image"
-	"github.com/containers/libpod/pkg/bindings"
-)
-
-// Search looks for the given image (term) in container image registries.  The optional limit parameter sets
-// a maximum number of results returned.  The optional filters parameter allow for more specific image
-// searches.
-func Search(ctx context.Context, term string, limit *int, filters map[string][]string) ([]image.SearchResult, error) {
-	var (
-		searchResults []image.SearchResult
-	)
-	conn, err := bindings.GetClient(ctx)
-	if err != nil {
-		return nil, err
-	}
-	params := url.Values{}
-	params.Set("term", term)
-	if limit != nil {
-		params.Set("limit", strconv.Itoa(*limit))
-	}
-	if filters != nil {
-		stringFilter, err := bindings.FiltersToString(filters)
-		if err != nil {
-			return nil, err
-		}
-		params.Set("filters", stringFilter)
-	}
-	response, err := conn.DoRequest(nil, http.MethodGet, "/images/search", params)
-	if err != nil {
-		return searchResults, nil
-	}
-	return searchResults, response.Process(&searchResults)
-}
diff --git a/pkg/bindings/test/images_test.go b/pkg/bindings/test/images_test.go
index 992720196..58210efd0 100644
--- a/pkg/bindings/test/images_test.go
+++ b/pkg/bindings/test/images_test.go
@@ -314,11 +314,11 @@ var _ = Describe("Podman images", func() {
 	})
 
 	It("Search for an image", func() {
-		imgs, err := images.Search(bt.conn, "alpine", nil, nil)
+		reports, err := images.Search(bt.conn, "alpine", entities.ImageSearchOptions{})
 		Expect(err).To(BeNil())
-		Expect(len(imgs)).To(BeNumerically(">", 1))
+		Expect(len(reports)).To(BeNumerically(">", 1))
 		var foundAlpine bool
-		for _, i := range imgs {
+		for _, i := range reports {
 			if i.Name == "docker.io/library/alpine" {
 				foundAlpine = true
 				break
@@ -327,23 +327,20 @@ var _ = Describe("Podman images", func() {
 		Expect(foundAlpine).To(BeTrue())
 
 		// Search for alpine with a limit of 10
-		ten := 10
-		imgs, err = images.Search(bt.conn, "docker.io/alpine", &ten, nil)
+		reports, err = images.Search(bt.conn, "docker.io/alpine", entities.ImageSearchOptions{Limit: 10})
 		Expect(err).To(BeNil())
-		Expect(len(imgs)).To(BeNumerically("<=", 10))
+		Expect(len(reports)).To(BeNumerically("<=", 10))
 
 		// Search for alpine with stars greater than 100
-		filters := make(map[string][]string)
-		filters["stars"] = []string{"100"}
-		imgs, err = images.Search(bt.conn, "docker.io/alpine", nil, filters)
+		reports, err = images.Search(bt.conn, "docker.io/alpine", entities.ImageSearchOptions{Filters: []string{"stars=100"}})
 		Expect(err).To(BeNil())
-		for _, i := range imgs {
+		for _, i := range reports {
 			Expect(i.Stars).To(BeNumerically(">=", 100))
 		}
 
 		//	Search with a fqdn
-		imgs, err = images.Search(bt.conn, "quay.io/libpod/alpine_nginx", nil, nil)
-		Expect(len(imgs)).To(BeNumerically(">=", 1))
+		reports, err = images.Search(bt.conn, "quay.io/libpod/alpine_nginx", entities.ImageSearchOptions{})
+		Expect(len(reports)).To(BeNumerically(">=", 1))
 	})
 
 	It("Prune images", func() {
diff --git a/pkg/domain/entities/engine_image.go b/pkg/domain/entities/engine_image.go
index 16b96e9ef..3110898a8 100644
--- a/pkg/domain/entities/engine_image.go
+++ b/pkg/domain/entities/engine_image.go
@@ -19,4 +19,5 @@ type ImageEngine interface {
 	Save(ctx context.Context, nameOrId string, tags []string, options ImageSaveOptions) error
 	Tag(ctx context.Context, nameOrId string, tags []string, options ImageTagOptions) error
 	Untag(ctx context.Context, nameOrId string, tags []string, options ImageUntagOptions) error
+	Search(ctx context.Context, term string, opts ImageSearchOptions) ([]ImageSearchReport, error)
 }
diff --git a/pkg/domain/entities/images.go b/pkg/domain/entities/images.go
index bc8a34c13..53a5f4951 100644
--- a/pkg/domain/entities/images.go
+++ b/pkg/domain/entities/images.go
@@ -181,6 +181,37 @@ type ImagePushOptions struct {
 	TLSVerify types.OptionalBool
 }
 
+// ImageSearchOptions are the arguments for searching images.
+type ImageSearchOptions struct {
+	// Authfile is the path to the authentication file. Ignored for remote
+	// calls.
+	Authfile string
+	// Filters for the search results.
+	Filters []string
+	// Limit the number of results.
+	Limit int
+	// NoTrunc will not truncate the output.
+	NoTrunc bool
+	// TLSVerify to enable/disable HTTPS and certificate verification.
+	TLSVerify types.OptionalBool
+}
+
+// ImageSearchReport is the response from searching images.
+type ImageSearchReport struct {
+	// Index is the image index (e.g., "docker.io" or "quay.io")
+	Index string
+	// Name is the canoncical name of the image (e.g., "docker.io/library/alpine").
+	Name string
+	// Description of the image.
+	Description string
+	// Stars is the number of stars of the image.
+	Stars int
+	// Official indicates if it's an official image.
+	Official string
+	// Automated indicates if the image was created by an automated build.
+	Automated string
+}
+
 type ImageListOptions struct {
 	All     bool       `json:"all" schema:"all"`
 	Filter  []string   `json:"Filter,omitempty"`
diff --git a/pkg/domain/infra/abi/images.go b/pkg/domain/infra/abi/images.go
index 2edef2723..13abfa2e3 100644
--- a/pkg/domain/infra/abi/images.go
+++ b/pkg/domain/infra/abi/images.go
@@ -421,3 +421,38 @@ func (ir *ImageEngine) Diff(_ context.Context, nameOrId string, _ entities.DiffO
 	}
 	return &entities.DiffReport{Changes: changes}, nil
 }
+
+func (ir *ImageEngine) Search(ctx context.Context, term string, opts entities.ImageSearchOptions) ([]entities.ImageSearchReport, error) {
+	filter, err := image.ParseSearchFilter(opts.Filters)
+	if err != nil {
+		return nil, err
+	}
+
+	searchOpts := image.SearchOptions{
+		Authfile:              opts.Authfile,
+		Filter:                *filter,
+		Limit:                 opts.Limit,
+		NoTrunc:               opts.NoTrunc,
+		InsecureSkipTLSVerify: opts.TLSVerify,
+	}
+
+	searchResults, err := image.SearchImages(term, searchOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	// Convert from image.SearchResults to entities.ImageSearchReport. We don't
+	// want to leak any low-level packages into the remote client, which
+	// requires converting.
+	reports := make([]entities.ImageSearchReport, len(searchResults))
+	for i := range searchResults {
+		reports[i].Index = searchResults[i].Index
+		reports[i].Name = searchResults[i].Name
+		reports[i].Description = searchResults[i].Index
+		reports[i].Stars = searchResults[i].Stars
+		reports[i].Official = searchResults[i].Official
+		reports[i].Automated = searchResults[i].Automated
+	}
+
+	return reports, nil
+}
diff --git a/pkg/domain/infra/tunnel/images.go b/pkg/domain/infra/tunnel/images.go
index 66abd7f47..54f2e8334 100644
--- a/pkg/domain/infra/tunnel/images.go
+++ b/pkg/domain/infra/tunnel/images.go
@@ -250,3 +250,7 @@ func (ir *ImageEngine) Diff(ctx context.Context, nameOrId string, _ entities.Dif
 	}
 	return &entities.DiffReport{Changes: changes}, nil
 }
+
+func (ir *ImageEngine) Search(ctx context.Context, term string, opts entities.ImageSearchOptions) ([]entities.ImageSearchReport, error) {
+	return images.Search(ir.ClientCxt, term, opts)
+}