117 lines
3.9 KiB
Go
117 lines
3.9 KiB
Go
package bundle
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import (
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"context"
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"fmt"
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"gitea.maximumdirect.net/eric/distributor/internal/storage"
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)
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func ValidateSourcePath(path string) error {
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if err := storage.ValidatePath(path); err != nil {
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return err
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}
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switch path {
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case ManifestName, storage.StateFileName:
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return fmt.Errorf("%q is reserved", path)
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}
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return nil
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}
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func ValidateManifest(manifest Manifest) error {
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if manifest.SchemaVersion != 1 {
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return fmt.Errorf("schema_version must be 1")
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}
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if manifest.ID == "" {
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return fmt.Errorf("id is required")
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}
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if err := ValidateDigest(manifest.Digest); err != nil {
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return fmt.Errorf("digest: %w", err)
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}
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if manifest.Created.IsZero() {
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return fmt.Errorf("created is required")
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}
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if len(manifest.Files) == 0 {
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return fmt.Errorf("files is required")
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}
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seen := make(map[string]struct{}, len(manifest.Files))
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for index, file := range manifest.Files {
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if err := ValidateSourcePath(file.Path); err != nil {
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return fmt.Errorf("files[%d].path: %w", index, err)
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}
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if err := ValidateDigest(file.SHA256); err != nil {
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return fmt.Errorf("files[%d].sha256: %w", index, err)
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}
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if file.Size < 0 {
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return fmt.Errorf("files[%d].size must be non-negative", index)
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}
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if _, exists := seen[file.Path]; exists {
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return fmt.Errorf("files[%d].path duplicates %q", index, file.Path)
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}
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seen[file.Path] = struct{}{}
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}
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if actual := BundleDigest(manifest.Files); actual != manifest.Digest {
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return fmt.Errorf("digest mismatch: got %s want %s", actual, manifest.Digest)
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}
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return nil
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}
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func Validate(ctx context.Context, backend storage.Backend, bundleRoot string) (Bundle, error) {
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return validateAt(ctx, backend, bundleRoot, bundleRoot)
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}
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func validateAt(ctx context.Context, backend storage.Backend, bundleRoot, relativeRoot string) (Bundle, error) {
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if err := storage.ValidatePrefix(bundleRoot); err != nil {
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return Bundle{}, err
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}
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manifestPath, err := storage.Join(bundleRoot, ManifestName)
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if err != nil {
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return Bundle{}, err
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}
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manifestData, err := backend.ReadFile(ctx, manifestPath)
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if err != nil {
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return Bundle{}, fmt.Errorf("read manifest %q: %w", manifestPath, err)
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}
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manifest, err := ParseManifest(manifestData)
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if err != nil {
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return Bundle{}, fmt.Errorf("bundle %q: %w", storage.DisplayPath(relativeRoot), err)
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}
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for index, manifestFile := range manifest.Files {
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filePath, err := storage.Join(bundleRoot, manifestFile.Path)
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if err != nil {
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return Bundle{}, fmt.Errorf("bundle %q file %q: %w", storage.DisplayPath(relativeRoot), manifestFile.Path, err)
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}
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entry, err := backend.Stat(ctx, filePath)
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if err != nil {
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return Bundle{}, fmt.Errorf("bundle %q file %q stat: %w", storage.DisplayPath(relativeRoot), manifestFile.Path, err)
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}
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if entry.Type != storage.EntryTypeFile {
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return Bundle{}, fmt.Errorf("bundle %q file %q must be a regular file", storage.DisplayPath(relativeRoot), manifestFile.Path)
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}
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if entry.Size != manifestFile.Size {
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return Bundle{}, fmt.Errorf("bundle %q file %q size mismatch: got %d want %d", storage.DisplayPath(relativeRoot), manifestFile.Path, entry.Size, manifestFile.Size)
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}
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data, err := backend.ReadFile(ctx, filePath)
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if err != nil {
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return Bundle{}, fmt.Errorf("bundle %q file %q read: %w", storage.DisplayPath(relativeRoot), manifestFile.Path, err)
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}
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actualDigest := FileDigest(data)
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if actualDigest != manifestFile.SHA256 {
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return Bundle{}, fmt.Errorf("bundle %q file %q sha256 mismatch: got %s want %s", storage.DisplayPath(relativeRoot), manifestFile.Path, actualDigest, manifestFile.SHA256)
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}
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manifest.Files[index].SHA256 = actualDigest
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manifest.Files[index].Size = int64(len(data))
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}
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actualBundleDigest := BundleDigest(manifest.Files)
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if actualBundleDigest != manifest.Digest {
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return Bundle{}, fmt.Errorf("bundle %q digest mismatch: got %s want %s", storage.DisplayPath(relativeRoot), actualBundleDigest, manifest.Digest)
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}
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return Bundle{
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RootRelativePath: relativeRoot,
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Manifest: manifest,
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}, nil
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}
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