1 files changed, 107 insertions, 0 deletions
diff --git a/client/errors.go b/client/errors.go
new file mode 100644
index 0000000..3e7a5dc
--- /dev/null
+++ b/client/errors.go
@@ -0,0 +1,107 @@
+package client
+
+import (
+	"errors"
+	"fmt"
+)
+
+var (
+	ErrNoRootKeys       = errors.New("tuf: no root keys found in local meta store")
+	ErrInsufficientKeys = errors.New("tuf: insufficient keys to meet threshold")
+	ErrNoLocalSnapshot  = errors.New("tuf: no snapshot stored locally")
+)
+
+type ErrMissingRemoteMetadata struct {
+	Name string
+}
+
+func (e ErrMissingRemoteMetadata) Error() string {
+	return fmt.Sprintf("tuf: missing remote metadata %s", e.Name)
+}
+
+type ErrDownloadFailed struct {
+	File string
+	Err  error
+}
+
+func (e ErrDownloadFailed) Error() string {
+	return fmt.Sprintf("tuf: failed to download %s: %s", e.File, e.Err)
+}
+
+type ErrDecodeFailed struct {
+	File string
+	Err  error
+}
+
+func (e ErrDecodeFailed) Error() string {
+	return fmt.Sprintf("tuf: failed to decode %s: %s", e.File, e.Err)
+}
+
+type ErrMaxDelegations struct {
+	Target          string
+	MaxDelegations  int
+	SnapshotVersion int64
+}
+
+func (e ErrMaxDelegations) Error() string {
+	return fmt.Sprintf("tuf: max delegation of %d reached searching for %s with snapshot version %d", e.MaxDelegations, e.Target, e.SnapshotVersion)
+}
+
+type ErrNotFound struct {
+	File string
+}
+
+func (e ErrNotFound) Error() string {
+	return fmt.Sprintf("tuf: file not found: %s", e.File)
+}
+
+func IsNotFound(err error) bool {
+	_, ok := err.(ErrNotFound)
+	return ok
+}
+
+type ErrWrongSize struct {
+	File     string
+	Actual   int64
+	Expected int64
+}
+
+func (e ErrWrongSize) Error() string {
+	return fmt.Sprintf("tuf: unexpected file size: %s (expected %d bytes, got %d bytes)", e.File, e.Expected, e.Actual)
+}
+
+type ErrUnknownTarget struct {
+	Name            string
+	SnapshotVersion int64
+}
+
+func (e ErrUnknownTarget) Error() string {
+	return fmt.Sprintf("tuf: unknown target file: %s with snapshot version %d", e.Name, e.SnapshotVersion)
+}
+
+type ErrMetaTooLarge struct {
+	Name    string
+	Size    int64
+	MaxSize int64
+}
+
+func (e ErrMetaTooLarge) Error() string {
+	return fmt.Sprintf("tuf: %s size %d bytes greater than maximum %d bytes", e.Name, e.Size, e.MaxSize)
+}
+
+type ErrInvalidURL struct {
+	URL string
+}
+
+func (e ErrInvalidURL) Error() string {
+	return fmt.Sprintf("tuf: invalid repository URL %s", e.URL)
+}
+
+type ErrRoleNotInSnapshot struct {
+	Role            string
+	SnapshotVersion int64
+}
+
+func (e ErrRoleNotInSnapshot) Error() string {
+	return fmt.Sprintf("tuf: role %s not in snapshot version %d", e.Role, e.SnapshotVersion)
+}