repository: merge git.Hash in for one less /util package

1 files changed, 51 insertions, 0 deletions

diff --git a/repository/hash.go b/repository/hash.go
new file mode 100644
index 00000000..6a11558f
--- /dev/null
+++ b/repository/hash.go
@@ -0,0 +1,51 @@
+package repository
+
+import (
+	"fmt"
+	"io"
+)
+
+const idLengthSHA1 = 40
+const idLengthSHA256 = 64
+
+// Hash is a git hash
+type Hash string
+
+func (h Hash) String() string {
+	return string(h)
+}
+
+// UnmarshalGQL implement the Unmarshaler interface for gqlgen
+func (h *Hash) UnmarshalGQL(v interface{}) error {
+	_, ok := v.(string)
+	if !ok {
+		return fmt.Errorf("hashes must be strings")
+	}
+
+	*h = v.(Hash)
+
+	if !h.IsValid() {
+		return fmt.Errorf("invalid hash")
+	}
+
+	return nil
+}
+
+// MarshalGQL implement the Marshaler interface for gqlgen
+func (h Hash) MarshalGQL(w io.Writer) {
+	_, _ = w.Write([]byte(`"` + h.String() + `"`))
+}
+
+// IsValid tell if the hash is valid
+func (h *Hash) IsValid() bool {
+	// Support for both sha1 and sha256 git hashes
+	if len(*h) != idLengthSHA1 && len(*h) != idLengthSHA256 {
+		return false
+	}
+	for _, r := range *h {
+		if (r < 'a' || r > 'z') && (r < '0' || r > '9') {
+			return false
+		}
+	}
+	return true
+}