store both new and old revision emojis in status

internal/api/util/parseform.go

@@ -18,13 +18,55 @@
 package util
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
+	"strings"
 
 	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
 	"github.com/superseriousbusiness/gotosocial/internal/util"
 )
 
+// ParseFocus parses a media attachment focus parameters from incoming API string.
+func ParseFocus(focus string) (focusx, focusy float32, errWithCode gtserror.WithCode) {
+	if focus == "" {
+		return
+	}
+	spl := strings.Split(focus, ",")
+	if len(spl) != 2 {
+		const text = "missing comma separator"
+		errWithCode = gtserror.NewErrorBadRequest(
+			errors.New(text),
+			text,
+		)
+		return
+	}
+	xStr := spl[0]
+	yStr := spl[1]
+	fx, err := strconv.ParseFloat(xStr, 32)
+	if err != nil || fx > 1 || fx < -1 {
+		text := fmt.Sprintf("invalid x focus: %s", xStr)
+		errWithCode = gtserror.NewErrorBadRequest(
+			errors.New(text),
+			text,
+		)
+		return
+	}
+	fy, err := strconv.ParseFloat(yStr, 32)
+	if err != nil || fy > 1 || fy < -1 {
+		text := fmt.Sprintf("invalid y focus: %s", xStr)
+		errWithCode = gtserror.NewErrorBadRequest(
+			errors.New(text),
+			text,
+		)
+		return
+	}
+	focusx = float32(fx)
+	focusy = float32(fy)
+	return
+}
+
 // ParseDuration parses the given raw interface belonging
 // the given fieldName as an integer duration.
 func ParseDuration(rawI any, fieldName string) (*int, error) {