cli: use versionsapi fetcher to fetch image ref

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

internal/image/image.go

@@ -9,133 +9,29 @@ package image
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"os"
-	"path"
-	"strings"
+	"io/fs"
+	"regexp"
 
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
 	"github.com/edgelesssys/constellation/v2/internal/config"
-	"github.com/edgelesssys/constellation/v2/internal/constants"
-	"github.com/edgelesssys/constellation/v2/internal/shortname"
+	"github.com/edgelesssys/constellation/v2/internal/versionsapi"
+	"github.com/edgelesssys/constellation/v2/internal/versionsapi/fetcher"
 	"github.com/spf13/afero"
 )
 
-// imageName is a struct that describes a Constellation OS imageName name.
-type imageName struct {
-	Ref     string
-	Stream  string
-	Version string
-}
-
-func newImageName(name string) (*imageName, error) {
-	ref, stream, version, err := shortname.ToParts(name)
-	if err != nil {
-		return nil, err
-	}
-	return &imageName{
-		Ref:     ref,
-		Stream:  stream,
-		Version: version,
-	}, nil
-}
-
-func (i *imageName) infoPath() string {
-	return path.Join(constants.CDNAPIPrefix, "ref", i.Ref, "stream", i.Stream, "image", i.Version, "info.json")
-}
-
-func (i *imageName) shortname() string {
-	return shortname.FromParts(i.Ref, i.Stream, i.Version)
-}
-
-// filename is the override file name for the image info file.
-func (i *imageName) filename() string {
-	name := i.shortname()
-	// replace all non-alphanumeric characters with an underscore
-	name = strings.Map(func(r rune) rune {
-		if r >= 'a' && r <= 'z' || r >= 'A' && r <= 'Z' || r >= '0' && r <= '9' || r == '-' || r == '.' {
-			return r
-		}
-		return '_'
-	}, name)
-	return name + ".json"
-}
-
-// imageInfo is a lookup table for image references.
-//
-// Example:
-//
-//	{
-//	  "aws": {
-//	    "us-west-2": "ami-0123456789abcdef0"
-//	  },
-//	  "azure": {
-//	    "cvm": "cvm-image-id"
-//	  },
-//	  "gcp": {
-//	    "sev-es": "projects/<project>/global/images/<image>"
-//	  },
-//	  "qemu": {
-//	    "default": "https://cdn.example.com/image.raw"
-//	},
-//	"version": "1.0.0",
-//	"debug": false
-//	}
-type imageInfo struct {
-	AWS     map[string]string `json:"aws,omitempty"`
-	Azure   map[string]string `json:"azure,omitempty"`
-	GCP     map[string]string `json:"gcp,omitempty"`
-	QEMU    map[string]string `json:"qemu,omitempty"`
-	Debug   bool              `json:"debug,omitempty"`
-	Version string            `json:"version,omitempty"`
-}
-
-// getReference returns the image reference for a given CSP and image variant.
-func (l *imageInfo) getReference(csp, variant string) (string, error) {
-	if l == nil {
-		return "", fmt.Errorf("image info is nil")
-	}
-
-	var cspList map[string]string
-	switch cloudprovider.FromString(csp) {
-	case cloudprovider.AWS:
-		cspList = l.AWS
-	case cloudprovider.Azure:
-		cspList = l.Azure
-	case cloudprovider.GCP:
-		cspList = l.GCP
-	case cloudprovider.QEMU:
-		cspList = l.QEMU
-	default:
-		return "", fmt.Errorf("image not available for CSP %q", csp)
-	}
-
-	if cspList == nil {
-		return "", fmt.Errorf("image not available for CSP %q", csp)
-	}
-
-	ref, ok := cspList[variant]
-	if !ok {
-		return "", fmt.Errorf("image not available for variant %q", variant)
-	}
-
-	return ref, nil
-}
-
 // Fetcher fetches image references using a lookup table.
 type Fetcher struct {
-	httpc httpc
-	fs    *afero.Afero
+	fetcher versionsAPIImageInfoFetcher
+	fs      *afero.Afero
 }
 
 // New returns a new image fetcher.
 func New() *Fetcher {
 	return &Fetcher{
-		httpc: http.DefaultClient,
-		fs:    &afero.Afero{Fs: afero.NewOsFs()},
+		fetcher: fetcher.NewFetcher(),
+		fs:      &afero.Afero{Fs: afero.NewOsFs()},
 	}
 }
 
@@ -146,27 +42,31 @@ func (f *Fetcher) FetchReference(ctx context.Context, config *config.Config) (st
 	if err != nil {
 		return "", err
 	}
-	image, err := newImageName(config.Image)
+
+	ver, err := versionsapi.NewVersionFromShortPath(config.Image, versionsapi.VersionKindImage)
 	if err != nil {
 		return "", err
 	}
-	return f.fetch(ctx, provider, image, variant)
-}
 
-// fetch fetches the image reference for a given image name, uid, CSP and image variant.
-func (f *Fetcher) fetch(ctx context.Context, csp cloudprovider.Provider, img *imageName, variant string) (string, error) {
-	raw, err := getFromFile(f.fs, img)
-	if err != nil && os.IsNotExist(err) {
-		raw, err = getFromURL(ctx, f.httpc, img)
+	imgInfoReq := versionsapi.ImageInfo{
+		Ref:     ver.Ref,
+		Stream:  ver.Stream,
+		Version: ver.Version,
+	}
+
+	imgInfo, err := getFromFile(f.fs, imgInfoReq)
+	if err != nil && errors.Is(err, fs.ErrNotExist) {
+		imgInfo, err = f.fetcher.FetchImageInfo(ctx, imgInfoReq)
 	}
 	if err != nil {
-		return "", fmt.Errorf("fetching image reference: %w", err)
+		return "", err
 	}
-	var info imageInfo
-	if err := json.Unmarshal(raw, &info); err != nil {
-		return "", fmt.Errorf("decoding image reference: %w", err)
+
+	if err := imgInfo.Validate(); err != nil {
+		return "", fmt.Errorf("validating image info file: %w", err)
 	}
-	return info.getReference(strings.ToLower(csp.String()), variant)
+
+	return getReferenceFromImageInfo(provider, variant, imgInfo)
 }
 
 // variant returns the image variant for a given CSP and configuration.
@@ -189,42 +89,58 @@ func variant(provider cloudprovider.Provider, config *config.Config) (string, er
 	}
 }
 
-func getFromFile(fs *afero.Afero, img *imageName) ([]byte, error) {
-	return fs.ReadFile(img.filename())
-}
+func getFromFile(fs *afero.Afero, imgInfo versionsapi.ImageInfo) (versionsapi.ImageInfo, error) {
+	fileName := imageInfoFilename(imgInfo)
 
-// getFromURL fetches the image lookup table from a URL.
-func getFromURL(ctx context.Context, client httpc, img *imageName) ([]byte, error) {
-	url, err := url.Parse(constants.CDNRepositoryURL)
+	raw, err := fs.ReadFile(fileName)
 	if err != nil {
-		return nil, fmt.Errorf("parsing image version repository URL: %w", err)
-	}
-	url.Path = img.infoPath()
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url.String(), http.NoBody)
-	if err != nil {
-		return nil, err
+		return versionsapi.ImageInfo{}, err
 	}
 
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil, err
+	var newInfo versionsapi.ImageInfo
+	if err := json.Unmarshal(raw, &newInfo); err != nil {
+		return versionsapi.ImageInfo{}, fmt.Errorf("decoding image info file: %w", err)
 	}
-	defer resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		switch resp.StatusCode {
-		case http.StatusNotFound:
-			return nil, fmt.Errorf("image %q does not exist", img.shortname())
-		default:
-			return nil, fmt.Errorf("unexpected status code %d", resp.StatusCode)
-		}
-	}
-	content, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, err
-	}
-	return content, nil
+
+	return newInfo, nil
 }
 
-type httpc interface {
-	Do(req *http.Request) (*http.Response, error)
+var filenameReplaceRegexp = regexp.MustCompile(`([^a-zA-Z0-9.-])`)
+
+func imageInfoFilename(imgInfo versionsapi.ImageInfo) string {
+	path := imgInfo.JSONPath()
+	return filenameReplaceRegexp.ReplaceAllString(path, "_")
+}
+
+// getReferenceFromImageInfo returns the image reference for a given CSP and image variant.
+func getReferenceFromImageInfo(provider cloudprovider.Provider, variant string, imgInfo versionsapi.ImageInfo,
+) (string, error) {
+	var providerList map[string]string
+	switch provider {
+	case cloudprovider.AWS:
+		providerList = imgInfo.AWS
+	case cloudprovider.Azure:
+		providerList = imgInfo.Azure
+	case cloudprovider.GCP:
+		providerList = imgInfo.GCP
+	case cloudprovider.QEMU:
+		providerList = imgInfo.QEMU
+	default:
+		return "", fmt.Errorf("image not available in image info for CSP %q", provider.String())
+	}
+
+	if providerList == nil {
+		return "", fmt.Errorf("image not available in image info for CSP %q", provider.String())
+	}
+
+	ref, ok := providerList[variant]
+	if !ok {
+		return "", fmt.Errorf("image not available in image info for variant %q", variant)
+	}
+
+	return ref, nil
+}
+
+type versionsAPIImageInfoFetcher interface {
+	FetchImageInfo(ctx context.Context, imageInfo versionsapi.ImageInfo) (versionsapi.ImageInfo, error)
 }

internal/image/image_test.go

@@ -7,16 +7,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 package image
 
 import (
-	"bytes"
 	"context"
-	"io"
+	"encoding/json"
+	"errors"
 	"net/http"
-	"os"
-	"strings"
 	"testing"
 
 	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
 	"github.com/edgelesssys/constellation/v2/internal/config"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/edgelesssys/constellation/v2/internal/versionsapi"
 	"github.com/spf13/afero"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -29,40 +29,59 @@ func TestMain(m *testing.M) {
 
 func TestGetReference(t *testing.T) {
 	testCases := map[string]struct {
-		info          *imageInfo
-		csp, variant  string
+		info          versionsapi.ImageInfo
+		provider      cloudprovider.Provider
+		variant       string
 		wantReference string
 		wantErr       bool
 	}{
-		"reference exists": {
-			info:          &imageInfo{AWS: map[string]string{"someVariant": "someReference"}},
-			csp:           "aws",
+		"reference exists aws": {
+			info:          versionsapi.ImageInfo{AWS: map[string]string{"someVariant": "someReference"}},
+			provider:      cloudprovider.AWS,
+			variant:       "someVariant",
+			wantReference: "someReference",
+		},
+		"reference exists azure": {
+			info:          versionsapi.ImageInfo{Azure: map[string]string{"someVariant": "someReference"}},
+			provider:      cloudprovider.Azure,
+			variant:       "someVariant",
+			wantReference: "someReference",
+		},
+		"reference exists gcp": {
+			info:          versionsapi.ImageInfo{GCP: map[string]string{"someVariant": "someReference"}},
+			provider:      cloudprovider.GCP,
+			variant:       "someVariant",
+			wantReference: "someReference",
+		},
+		"reference exists qemu": {
+			info:          versionsapi.ImageInfo{QEMU: map[string]string{"someVariant": "someReference"}},
+			provider:      cloudprovider.QEMU,
 			variant:       "someVariant",
 			wantReference: "someReference",
 		},
 		"csp does not exist": {
-			info:    &imageInfo{AWS: map[string]string{"someVariant": "someReference"}},
-			csp:     "nonExistingCSP",
-			variant: "someVariant",
-			wantErr: true,
+			info:     versionsapi.ImageInfo{AWS: map[string]string{"someVariant": "someReference"}},
+			provider: cloudprovider.Unknown,
+			variant:  "someVariant",
+			wantErr:  true,
 		},
 		"variant does not exist": {
-			info:    &imageInfo{AWS: map[string]string{"someVariant": "someReference"}},
-			csp:     "aws",
-			variant: "nonExistingVariant",
-			wantErr: true,
+			info:     versionsapi.ImageInfo{AWS: map[string]string{"someVariant": "someReference"}},
+			provider: cloudprovider.AWS,
+			variant:  "nonExistingVariant",
+			wantErr:  true,
 		},
-		"info is nil": {
-			info:    nil,
-			csp:     "aws",
-			variant: "someVariant",
-			wantErr: true,
+		"info is empty": {
+			info:     versionsapi.ImageInfo{},
+			provider: cloudprovider.AWS,
+			variant:  "someVariant",
+			wantErr:  true,
 		},
 		"csp is nil": {
-			info:    &imageInfo{AWS: nil},
-			csp:     "aws",
-			variant: "someVariant",
-			wantErr: true,
+			info:     versionsapi.ImageInfo{AWS: nil},
+			provider: cloudprovider.AWS,
+			variant:  "someVariant",
+			wantErr:  true,
 		},
 	}
 
@@ -71,7 +90,7 @@ func TestGetReference(t *testing.T) {
 			assert := assert.New(t)
 			require := require.New(t)
 
-			reference, err := tc.info.getReference(tc.csp, tc.variant)
+			reference, err := getReferenceFromImageInfo(tc.provider, tc.variant, tc.info)
 
 			if tc.wantErr {
 				assert.Error(err)
@@ -83,14 +102,6 @@ func TestGetReference(t *testing.T) {
 	}
 }
 
-func TestGetReferenceOnNil(t *testing.T) {
-	assert := assert.New(t)
-
-	var lut *imageInfo
-	_, err := lut.getReference("someCSP", "someVariant")
-	assert.Error(err)
-}
-
 func TestVariant(t *testing.T) {
 	testCases := map[string]struct {
 		csp         cloudprovider.Provider
@@ -161,55 +172,104 @@ func TestVariant(t *testing.T) {
 
 func TestFetchReference(t *testing.T) {
 	img := "ref/abc/stream/nightly/v1.2.3"
-	client := newTestClient(func(req *http.Request) *http.Response {
-		if strings.HasSuffix(req.URL.String(), "/constellation/v1/ref/abc/stream/nightly/image/v1.2.3/info.json") {
-			return &http.Response{
-				StatusCode: http.StatusOK,
-				Body:       io.NopCloser(bytes.NewBufferString(lut)),
-				Header:     make(http.Header),
-			}
+	newImgInfo := func() versionsapi.ImageInfo {
+		return versionsapi.ImageInfo{
+			Ref:     "abc",
+			Stream:  "nightly",
+			Version: "v1.2.3",
+			QEMU:    map[string]string{"default": "someReference"},
+			AWS:     map[string]string{"foo": "bar"},
+			Azure:   map[string]string{"foo": "bar"},
+			GCP:     map[string]string{"foo": "bar"},
 		}
-		return &http.Response{
-			StatusCode: http.StatusNotFound,
-			Body:       io.NopCloser(bytes.NewBufferString("Not found.")),
-			Header:     make(http.Header),
-		}
-	})
+	}
+	imgInfoPath := imageInfoFilename(newImgInfo())
 
 	testCases := map[string]struct {
-		config        *config.Config
-		overrideFile  string
-		wantReference string
-		wantErr       bool
+		config           *config.Config
+		imageInfoFetcher versionsAPIImageInfoFetcher
+		localFile        []byte
+		wantReference    string
+		wantErr          bool
 	}{
 		"reference fetched remotely": {
-			config: &config.Config{Image: img, Provider: config.ProviderConfig{
-				QEMU: &config.QEMUConfig{},
-			}},
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			imageInfoFetcher: &stubVersionsAPIImageFetcher{
+				fetchImageInfoInfo: newImgInfo(),
+			},
 			wantReference: "someReference",
 		},
-		"reference fetched locally": {
-			config: &config.Config{Image: img, Provider: config.ProviderConfig{
-				QEMU: &config.QEMUConfig{},
-			}},
-			overrideFile:  `{"qemu":{"default":"localOverrideReference"}}`,
-			wantReference: "localOverrideReference",
-		},
-		"lut is invalid": {
-			config: &config.Config{Image: img, Provider: config.ProviderConfig{
-				QEMU: &config.QEMUConfig{},
-			}},
-			overrideFile: `{`,
-			wantErr:      true,
-		},
-		"image version does not exist": {
-			config: &config.Config{Image: "nonExistingImageName", Provider: config.ProviderConfig{
-				QEMU: &config.QEMUConfig{},
-			}},
+		"reference fetched remotely fails": {
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			imageInfoFetcher: &stubVersionsAPIImageFetcher{
+				fetchImageInfoErr: errors.New("failed"),
+			},
 			wantErr: true,
 		},
-		"invalid config": {
-			config:  &config.Config{},
+		"reference fetched locally": {
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			localFile: func() []byte {
+				info := newImgInfo()
+				info.QEMU["default"] = "localOverrideReference"
+				file, err := json.Marshal(info)
+				require.NoError(t, err)
+				return file
+			}(),
+			wantReference: "localOverrideReference",
+		},
+		"local file first": {
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			imageInfoFetcher: &stubVersionsAPIImageFetcher{
+				fetchImageInfoInfo: newImgInfo(),
+			},
+			localFile: func() []byte {
+				info := newImgInfo()
+				info.QEMU["default"] = "localOverrideReference"
+				file, err := json.Marshal(info)
+				require.NoError(t, err)
+				return file
+			}(),
+			wantReference: "localOverrideReference",
+		},
+		"local file is invalid": {
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			localFile: []byte("invalid"),
+			wantErr:   true,
+		},
+		"local file has invalid image info": {
+			config: &config.Config{
+				Image:    img,
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
+			localFile: func() []byte {
+				info := newImgInfo()
+				info.Ref = ""
+				file, err := json.Marshal(info)
+				require.NoError(t, err)
+				return file
+			}(),
+			wantErr: true,
+		},
+		"image version does not exist": {
+			config: &config.Config{
+				Image:    "nonExistingImageName",
+				Provider: config.ProviderConfig{QEMU: &config.QEMUConfig{}},
+			},
 			wantErr: true,
 		},
 	}
@@ -219,11 +279,20 @@ func TestFetchReference(t *testing.T) {
 			assert := assert.New(t)
 			require := require.New(t)
 
-			fetcher := &Fetcher{
-				httpc: client,
-				fs:    newImageVersionStubFs(t, img, tc.overrideFile),
+			fs := afero.NewMemMapFs()
+			af := &afero.Afero{Fs: fs}
+			if tc.localFile != nil {
+				fh := file.NewHandler(af)
+				require.NoError(fh.Write(imgInfoPath, tc.localFile))
 			}
+
+			fetcher := &Fetcher{
+				fetcher: tc.imageInfoFetcher,
+				fs:      af,
+			}
+
 			reference, err := fetcher.FetchReference(context.Background(), tc.config)
+
 			if tc.wantErr {
 				assert.Error(err)
 				return
@@ -234,6 +303,17 @@ func TestFetchReference(t *testing.T) {
 	}
 }
 
+type stubVersionsAPIImageFetcher struct {
+	fetchImageInfoInfo versionsapi.ImageInfo
+	fetchImageInfoErr  error
+}
+
+func (f *stubVersionsAPIImageFetcher) FetchImageInfo(ctx context.Context, imageInfo versionsapi.ImageInfo) (
+	versionsapi.ImageInfo, error,
+) {
+	return f.fetchImageInfoInfo, f.fetchImageInfoErr
+}
+
 func must(t *testing.T, err error) {
 	t.Helper()
 	if err != nil {
@@ -255,15 +335,3 @@ func newTestClient(fn roundTripFunc) *http.Client {
 		Transport: fn,
 	}
 }
-
-func newImageVersionStubFs(t *testing.T, image string, overrideFile string) *afero.Afero {
-	fs := afero.NewMemMapFs()
-	img, err := newImageName(image)
-	must(t, err)
-	if overrideFile != "" {
-		must(t, afero.WriteFile(fs, img.filename(), []byte(overrideFile), os.ModePerm))
-	}
-	return &afero.Afero{Fs: fs}
-}
-
-const lut = `{"qemu":{"default":"someReference"}}`

internal/image/raw.go

@@ -137,3 +137,7 @@ func (*nopWriteCloser) Write(p []byte) (int, error) {
 func (*nopWriteCloser) Close() error {
 	return nil
 }
+
+type httpc interface {
+	Do(req *http.Request) (*http.Response, error)
+}