Port GetAllLFSPointers to go

2 files changed, 34 insertions, 0 deletions

diff --git a/internal/git/catfile/objectinfo.go b/internal/git/catfile/objectinfo.go
index 7f7af80a5..de296287d 100644
--- a/internal/git/catfile/objectinfo.go
+++ b/internal/git/catfile/objectinfo.go
@@ -28,6 +28,9 @@ func (o *ObjectInfo) IsBlob() bool {
 	return o.Type == "blob"
 }
 
+// ParseObjectInfo reads from a reader and parses the data into an ObjectInfo struct
+var ParseObjectInfo = parseObjectInfo
+
 func parseObjectInfo(stdout *bufio.Reader) (*ObjectInfo, error) {
 	infoLine, err := stdout.ReadString('\n')
 	if err != nil {
diff --git a/internal/git/lfs.go b/internal/git/lfs.go
new file mode 100644
index 000000000..78f3aadd9
--- /dev/null
+++ b/internal/git/lfs.go
@@ -0,0 +1,31 @@
+package git
+
+import (
+	"bytes"
+	"regexp"
+)
+
+var (
+	lfsOIDRe  = regexp.MustCompile(`(?m)^oid sha256:[0-9a-f]{64}$`)
+	lfsSizeRe = regexp.MustCompile(`(?m)^size [0-9]+$`)
+)
+
+// IsLFSPointer checks to see if a blob is an LFS pointer. It returns the raw data of the pointer if it is
+func IsLFSPointer(b []byte) bool {
+	// ensure the version exists
+	if !bytes.HasPrefix(b, []byte("version https://git-lfs.github.com/spec")) {
+		return false
+	}
+
+	// ensure the oid exists
+	if !lfsOIDRe.Match(b) {
+		return false
+	}
+
+	// ensure the size exists
+	if !lfsSizeRe.Match(b) {
+		return false
+	}
+
+	return true
+}