fix: error handling and vendor

vendor/github.com/danieljoos/wincred/conversion.go

@@ -0,0 +1,117 @@
+//go:build windows
+// +build windows
+
+package wincred
+
+import (
+	"encoding/binary"
+	"reflect"
+	"time"
+	"unsafe"
+
+	syscall "golang.org/x/sys/windows"
+)
+
+// utf16ToByte creates a byte array from a given UTF 16 char array.
+func utf16ToByte(wstr []uint16) (result []byte) {
+	result = make([]byte, len(wstr)*2)
+	for i := range wstr {
+		binary.LittleEndian.PutUint16(result[(i*2):(i*2)+2], wstr[i])
+	}
+	return
+}
+
+// utf16FromString creates a UTF16 char array from a string.
+func utf16FromString(str string) []uint16 {
+	res, err := syscall.UTF16FromString(str)
+	if err != nil {
+		return []uint16{}
+	}
+	return res
+}
+
+// goBytes copies the given C byte array to a Go byte array (see `C.GoBytes`).
+// This function avoids having cgo as dependency.
+func goBytes(src uintptr, len uint32) []byte {
+	if src == uintptr(0) {
+		return []byte{}
+	}
+	rv := make([]byte, len)
+	copy(rv, *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{
+		Data: src,
+		Len:  int(len),
+		Cap:  int(len),
+	})))
+	return rv
+}
+
+// Convert the given CREDENTIAL struct to a more usable structure
+func sysToCredential(cred *sysCREDENTIAL) (result *Credential) {
+	if cred == nil {
+		return nil
+	}
+	result = new(Credential)
+	result.Comment = syscall.UTF16PtrToString(cred.Comment)
+	result.TargetName = syscall.UTF16PtrToString(cred.TargetName)
+	result.TargetAlias = syscall.UTF16PtrToString(cred.TargetAlias)
+	result.UserName = syscall.UTF16PtrToString(cred.UserName)
+	result.LastWritten = time.Unix(0, cred.LastWritten.Nanoseconds())
+	result.Persist = CredentialPersistence(cred.Persist)
+	result.CredentialBlob = goBytes(cred.CredentialBlob, cred.CredentialBlobSize)
+	result.Attributes = make([]CredentialAttribute, cred.AttributeCount)
+	attrSlice := *(*[]sysCREDENTIAL_ATTRIBUTE)(unsafe.Pointer(&reflect.SliceHeader{
+		Data: cred.Attributes,
+		Len:  int(cred.AttributeCount),
+		Cap:  int(cred.AttributeCount),
+	}))
+	for i, attr := range attrSlice {
+		resultAttr := &result.Attributes[i]
+		resultAttr.Keyword = syscall.UTF16PtrToString(attr.Keyword)
+		resultAttr.Value = goBytes(attr.Value, attr.ValueSize)
+	}
+	return result
+}
+
+// Convert the given Credential object back to a CREDENTIAL struct, which can be used for calling the
+// Windows APIs
+func sysFromCredential(cred *Credential) (result *sysCREDENTIAL) {
+	if cred == nil {
+		return nil
+	}
+	result = new(sysCREDENTIAL)
+	result.Flags = 0
+	result.Type = 0
+	result.TargetName, _ = syscall.UTF16PtrFromString(cred.TargetName)
+	result.Comment, _ = syscall.UTF16PtrFromString(cred.Comment)
+	result.LastWritten = syscall.NsecToFiletime(cred.LastWritten.UnixNano())
+	result.CredentialBlobSize = uint32(len(cred.CredentialBlob))
+	if len(cred.CredentialBlob) > 0 {
+		result.CredentialBlob = uintptr(unsafe.Pointer(&cred.CredentialBlob[0]))
+	} else {
+		result.CredentialBlob = 0
+	}
+	result.Persist = uint32(cred.Persist)
+	result.AttributeCount = uint32(len(cred.Attributes))
+	attributes := make([]sysCREDENTIAL_ATTRIBUTE, len(cred.Attributes))
+	if len(attributes) > 0 {
+		result.Attributes = uintptr(unsafe.Pointer(&attributes[0]))
+	} else {
+		result.Attributes = 0
+	}
+	for i := range cred.Attributes {
+		inAttr := &cred.Attributes[i]
+		outAttr := &attributes[i]
+		outAttr.Keyword, _ = syscall.UTF16PtrFromString(inAttr.Keyword)
+		outAttr.Flags = 0
+		outAttr.ValueSize = uint32(len(inAttr.Value))
+		if len(inAttr.Value) > 0 {
+			outAttr.Value = uintptr(unsafe.Pointer(&inAttr.Value[0]))
+		} else {
+			outAttr.Value = 0
+		}
+	}
+	result.TargetAlias, _ = syscall.UTF16PtrFromString(cred.TargetAlias)
+	result.UserName, _ = syscall.UTF16PtrFromString(cred.UserName)
+
+	return
+}