1 files changed, 63 insertions, 0 deletions
diff --git a/internal/processing/media/util.go b/internal/processing/media/util.go
new file mode 100644
index 000000000..47ea4fccd
--- /dev/null
+++ b/internal/processing/media/util.go
@@ -0,0 +1,63 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package media
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func parseFocus(focus string) (focusx, focusy float32, err error) {
+	if focus == "" {
+		return
+	}
+	spl := strings.Split(focus, ",")
+	if len(spl) != 2 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	xStr := spl[0]
+	yStr := spl[1]
+	if xStr == "" || yStr == "" {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	fx, err := strconv.ParseFloat(xStr, 32)
+	if err != nil {
+		err = fmt.Errorf("improperly formatted focus %s: %s", focus, err)
+		return
+	}
+	if fx > 1 || fx < -1 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	focusx = float32(fx)
+	fy, err := strconv.ParseFloat(yStr, 32)
+	if err != nil {
+		err = fmt.Errorf("improperly formatted focus %s: %s", focus, err)
+		return
+	}
+	if fy > 1 || fy < -1 {
+		err = fmt.Errorf("improperly formatted focus %s", focus)
+		return
+	}
+	focusy = float32(fy)
+	return
+}