added checker module to validate kpm three-party dependencies

Signed-off-by: Nishant Bansal <[email protected]>

pkg/checker/checker.go

@@ -0,0 +1,98 @@
+package checker
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/hashicorp/go-version"
+	pkg "kcl-lang.io/kpm/pkg/package"
+)
+
+// Checker defines an interface for KclPkg dependencies checkers.
+type Checker interface {
+	Check(pkg.KclPkg) error
+}
+
+type DepChecker struct {
+	checkers []Checker
+}
+
+// NewDepChecker creates a new DepChecker with provided checkers.
+func NewDepChecker(checkers ...Checker) *DepChecker {
+	return &DepChecker{checkers: checkers}
+}
+
+// Check runs all individual checks for a kclPkg.
+func (c *DepChecker) Check(kclPkg pkg.KclPkg) error {
+	for _, checker := range c.checkers {
+		if err := checker.Check(kclPkg); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// IdentChecker validates the dependencies name in kclPkg.
+type IdentChecker struct{}
+
+func (c *IdentChecker) Check(kclPkg pkg.KclPkg) error {
+	for _, key := range kclPkg.Dependencies.Deps.Keys() {
+		dep, _ := kclPkg.Dependencies.Deps.Get(key)
+		if !isValidDependencyName(dep.Name) {
+			return fmt.Errorf("invalid dependency name: %s", dep.Name)
+		}
+	}
+	return nil
+}
+
+// VersionChecker validates the dependencies version in kclPkg.
+type VersionChecker struct{}
+
+func (c *VersionChecker) Check(kclPkg pkg.KclPkg) error {
+	for _, key := range kclPkg.Dependencies.Deps.Keys() {
+		dep, _ := kclPkg.Dependencies.Deps.Get(key)
+		if !isValidDependencyVersion(dep.Version) {
+			return fmt.Errorf("invalid dependency version: %s for %s", dep.Version, dep.Name)
+		}
+	}
+	return nil
+}
+
+// SumChecker validates the dependencies checksum in kclPkg.
+type SumChecker struct{}
+
+func (c *SumChecker) Check(kclPkg pkg.KclPkg) error {
+	if kclPkg.NoSumCheck {
+		return nil
+	}
+	for _, key := range kclPkg.Dependencies.Deps.Keys() {
+		dep, _ := kclPkg.Dependencies.Deps.Get(key)
+		trustedSum, err := getTrustedSum(dep)
+		if err != nil {
+			return fmt.Errorf("failed to get checksum from trusted source: %w", err)
+		}
+		if dep.Sum != trustedSum {
+			return fmt.Errorf("checksum verification failed for '%s': expected '%s', got '%s'", dep.Name, trustedSum, dep.Sum)
+		}
+	}
+	return nil
+}
+
+// isValidDependencyName reports whether the name of the dependency is appropriate.
+func isValidDependencyName(name string) bool {
+	validNamePattern := `^[a-zA-Z][a-zA-Z_\-\.]*[a-zA-Z]$`
+	regex := regexp.MustCompile(validNamePattern)
+	return regex.MatchString(name)
+}
+
+// isValidDependencyVersion reports whether v is a valid semantic version string.
+func isValidDependencyVersion(v string) bool {
+	_, err := version.NewVersion(v)
+	return err == nil
+}
+
+// Placeholder for getTrustedSum function
+func getTrustedSum(dep pkg.Dependency) (string, error) {
+	//  Need to be implemented to get the trusted checksum.
+	return "", nil
+}