feat: Add separate package manager and resolver

packagemanager/packagemanager.go

@@ -0,0 +1,53 @@
+package packagemanager
+
+import (
+	"context"
+
+	packagev1 "buf.build/gen/go/safedep/api/protocolbuffers/go/safedep/messages/package/v1"
+)
+
+type Command struct {
+	Args []string
+}
+
+type PackageInstallTarget struct {
+	PackageVersion *packagev1.PackageVersion
+}
+
+func (pit *PackageInstallTarget) HasVersion() bool {
+	return pit.PackageVersion != nil && pit.PackageVersion.GetVersion() != ""
+}
+
+type ParsedCommand struct {
+	// Original command
+	Command Command
+
+	// Parsed install target if this is an install command
+	InstallTargets []*PackageInstallTarget
+}
+
+func (pc *ParsedCommand) HasInstallTarget() bool {
+	return len(pc.InstallTargets) > 0
+}
+
+// PackageManager is the contract for implementing a package manager
+type PackageManager interface {
+	// Name of the package manager implementation
+	Name() string
+
+	// ParseCommand parses the command and returns a parsed command
+	// specific to the package manager implementation
+	ParseCommand(args []string) (*ParsedCommand, error)
+}
+
+// PackageResolver is the contract for resolving package info
+type PackageResolver interface {
+	// ResolveLatestVersion resolves the latest version for a given package
+	ResolveLatestVersion(context.Context, *packagev1.Package) (*packagev1.PackageVersion, error)
+
+	// ResolveDependencies resolves the dependencies for a given package version
+	// It returns a flattened list of all the dependencies based on implementation
+	// specific config. The version resolution is based on minimum version selection
+	// for a given version range.
+	ResolveDependencies(context.Context, *packagev1.PackageVersion) ([]*packagev1.PackageVersion, error)
+}