1 files changed, 275 insertions, 0 deletions
diff --git a/registry-scanner/pkg/image/image.go b/registry-scanner/pkg/image/image.go
new file mode 100644
index 0000000..01261be
--- /dev/null
+++ b/registry-scanner/pkg/image/image.go
@@ -0,0 +1,275 @@
+package image
+
+import (
+	"strings"
+	"time"
+
+	"github.com/distribution/distribution/v3/reference"
+
+	"github.com/argoproj-labs/argocd-image-updater/registry-scanner/pkg/log"
+	"github.com/argoproj-labs/argocd-image-updater/registry-scanner/pkg/tag"
+)
+
+type ContainerImage struct {
+	RegistryURL           string
+	ImageName             string
+	ImageTag              *tag.ImageTag
+	ImageAlias            string
+	HelmParamImageName    string
+	HelmParamImageVersion string
+	KustomizeImage        *ContainerImage
+	original              string
+}
+
+type ContainerImageList []*ContainerImage
+
+// NewFromIdentifier parses an image identifier and returns a populated ContainerImage
+func NewFromIdentifier(identifier string) *ContainerImage {
+	imgRef := identifier
+	alias := ""
+	if strings.Contains(identifier, "=") {
+		n := strings.SplitN(identifier, "=", 2)
+		imgRef = n[1]
+		alias = n[0]
+	}
+	if parsed, err := reference.ParseNormalizedNamed(imgRef); err == nil {
+		img := ContainerImage{}
+		img.RegistryURL = reference.Domain(parsed)
+		// remove default registry for backwards-compatibility
+		if img.RegistryURL == "docker.io" && !strings.HasPrefix(imgRef, "docker.io") {
+			img.RegistryURL = ""
+		}
+		img.ImageAlias = alias
+		img.ImageName = reference.Path(parsed)
+		// if library/ was added to the image name, remove it
+		if !strings.HasPrefix(imgRef, "library/") {
+			img.ImageName = strings.TrimPrefix(img.ImageName, "library/")
+		}
+		if digested, ok := parsed.(reference.Digested); ok {
+			img.ImageTag = &tag.ImageTag{
+				TagDigest: string(digested.Digest()),
+			}
+		} else if tagged, ok := parsed.(reference.Tagged); ok {
+			img.ImageTag = &tag.ImageTag{
+				TagName: tagged.Tag(),
+			}
+		}
+		img.original = identifier
+		return &img
+	}
+
+	// if distribution couldn't parse it, fall back to the legacy parsing logic
+	img := ContainerImage{}
+	img.RegistryURL = getRegistryFromIdentifier(identifier)
+	img.ImageAlias, img.ImageName, img.ImageTag = getImageTagFromIdentifier(identifier)
+	img.original = identifier
+	return &img
+}
+
+// String returns the string representation of given ContainerImage
+func (img *ContainerImage) String() string {
+	str := ""
+	if img.ImageAlias != "" {
+		str += img.ImageAlias
+		str += "="
+	}
+	str += img.GetFullNameWithTag()
+	return str
+}
+
+func (img *ContainerImage) GetFullNameWithoutTag() string {
+	str := ""
+	if img.RegistryURL != "" {
+		str += img.RegistryURL + "/"
+	}
+	str += img.ImageName
+	return str
+}
+
+// GetFullNameWithTag returns the complete image slug, including the registry
+// and any tag digest or tag name set for the image.
+func (img *ContainerImage) GetFullNameWithTag() string {
+	str := ""
+	if img.RegistryURL != "" {
+		str += img.RegistryURL + "/"
+	}
+	str += img.ImageName
+	if img.ImageTag != nil {
+		if img.ImageTag.TagName != "" {
+			str += ":"
+			str += img.ImageTag.TagName
+		}
+		if img.ImageTag.TagDigest != "" {
+			str += "@"
+			str += img.ImageTag.TagDigest
+		}
+	}
+	return str
+}
+
+// GetTagWithDigest returns tag name along with any tag digest set for the image
+func (img *ContainerImage) GetTagWithDigest() string {
+	str := ""
+	if img.ImageTag != nil {
+		if img.ImageTag.TagName != "" {
+			str += img.ImageTag.TagName
+		}
+		if img.ImageTag.TagDigest != "" {
+			if str == "" {
+				str += "latest"
+			}
+			str += "@"
+			str += img.ImageTag.TagDigest
+		}
+	}
+	return str
+}
+
+func (img *ContainerImage) Original() string {
+	return img.original
+}
+
+// IsUpdatable checks whether the given image can be updated with newTag while
+// taking tagSpec into account. tagSpec must be given as a semver compatible
+// version spec, i.e. ^1.0 or ~2.1
+func (img *ContainerImage) IsUpdatable(newTag, tagSpec string) bool {
+	return false
+}
+
+// WithTag returns a copy of img with new tag information set
+func (img *ContainerImage) WithTag(newTag *tag.ImageTag) *ContainerImage {
+	nimg := &ContainerImage{}
+	nimg.RegistryURL = img.RegistryURL
+	nimg.ImageName = img.ImageName
+	nimg.ImageTag = newTag
+	nimg.ImageAlias = img.ImageAlias
+	nimg.HelmParamImageName = img.HelmParamImageName
+	nimg.HelmParamImageVersion = img.HelmParamImageVersion
+	return nimg
+}
+
+func (img *ContainerImage) DiffersFrom(other *ContainerImage, checkVersion bool) bool {
+	return img.RegistryURL != other.RegistryURL || img.ImageName != other.ImageName || (checkVersion && img.ImageTag.TagName != other.ImageTag.TagName)
+}
+
+// ContainsImage checks whether img is contained in a list of images
+func (list *ContainerImageList) ContainsImage(img *ContainerImage, checkVersion bool) *ContainerImage {
+	// if there is a KustomizeImage override, check it for a match first
+	if img.KustomizeImage != nil {
+		if kustomizeMatch := list.ContainsImage(img.KustomizeImage, checkVersion); kustomizeMatch != nil {
+			return kustomizeMatch
+		}
+	}
+	for _, image := range *list {
+		if img.ImageName == image.ImageName && image.RegistryURL == img.RegistryURL {
+			if !checkVersion || image.ImageTag.TagName == img.ImageTag.TagName {
+				return image
+			}
+		}
+	}
+	return nil
+}
+
+func (list *ContainerImageList) Originals() []string {
+	results := make([]string, len(*list))
+	for i, img := range *list {
+		results[i] = img.Original()
+	}
+	return results
+}
+
+// String Returns the name of all images as a string, separated using comma
+func (list *ContainerImageList) String() string {
+	imgNameList := make([]string, 0)
+	for _, image := range *list {
+		imgNameList = append(imgNameList, image.String())
+	}
+	return strings.Join(imgNameList, ",")
+}
+
+// Gets the registry URL from an image identifier
+func getRegistryFromIdentifier(identifier string) string {
+	var imageString string
+	comp := strings.Split(identifier, "=")
+	if len(comp) > 1 {
+		imageString = comp[1]
+	} else {
+		imageString = identifier
+	}
+	comp = strings.Split(imageString, "/")
+	if len(comp) > 1 && strings.Contains(comp[0], ".") {
+		return comp[0]
+	} else {
+		return ""
+	}
+}
+
+// Gets the image name and tag from an image identifier
+func getImageTagFromIdentifier(identifier string) (string, string, *tag.ImageTag) {
+	var imageString string
+	var sourceName string
+
+	// The original name is prepended to the image name, separated by =
+	comp := strings.SplitN(identifier, "=", 2)
+	if len(comp) == 2 {
+		sourceName = comp[0]
+		imageString = comp[1]
+	} else {
+		imageString = identifier
+	}
+
+	// Strip any repository identifier from the string
+	comp = strings.Split(imageString, "/")
+	if len(comp) > 1 && strings.Contains(comp[0], ".") {
+		imageString = strings.Join(comp[1:], "/")
+	}
+
+	// We can either have a tag name or a digest reference, or both
+	// jannfis/test-image:0.1
+	// gcr.io/jannfis/test-image:0.1
+	// gcr.io/jannfis/test-image@sha256:abcde
+	// gcr.io/jannfis/test-image:test-tag@sha256:abcde
+	if strings.Contains(imageString, "@") {
+		comp = strings.SplitN(imageString, "@", 2)
+		colonPos := strings.LastIndex(comp[0], ":")
+		slashPos := strings.LastIndex(comp[0], "/")
+		if colonPos > slashPos {
+			// first half (before @) contains image and tag name
+			return sourceName, comp[0][:colonPos], tag.NewImageTag(comp[0][colonPos+1:], time.Unix(0, 0), comp[1])
+		} else {
+			// first half contains image name without tag name
+			return sourceName, comp[0], tag.NewImageTag("", time.Unix(0, 0), comp[1])
+		}
+	} else {
+		comp = strings.SplitN(imageString, ":", 2)
+		if len(comp) != 2 {
+			return sourceName, imageString, nil
+		} else {
+			tagName, tagDigest := getImageDigestFromTag(comp[1])
+			return sourceName, comp[0], tag.NewImageTag(tagName, time.Unix(0, 0), tagDigest)
+		}
+	}
+}
+
+func getImageDigestFromTag(tagStr string) (string, string) {
+	a := strings.Split(tagStr, "@")
+	if len(a) != 2 {
+		return tagStr, ""
+	} else {
+		return a[0], a[1]
+	}
+}
+
+// LogContext returns a log context for the given image, with required fields
+// set to the image's information.
+func (img *ContainerImage) LogContext() *log.LogContext {
+	logCtx := log.WithContext()
+	logCtx.AddField("image_name", img.GetFullNameWithoutTag())
+	logCtx.AddField("image_alias", img.ImageAlias)
+	logCtx.AddField("registry_url", img.RegistryURL)
+	if img.ImageTag != nil {
+		logCtx.AddField("image_tag", img.ImageTag.TagName)
+		logCtx.AddField("image_digest", img.ImageTag.TagDigest)
+	}
+	return logCtx
+}