fix reaction's name validation with + sign in it (#6221)

model/reaction.go

@@ -6,6 +6,7 @@ package model
 import (
 	"encoding/json"
 	"io"
+	"regexp"
 )
 
 type Reaction struct {
@@ -60,7 +61,9 @@ func (o *Reaction) IsValid() *AppError {
 		return NewLocAppError("Reaction.IsValid", "model.reaction.is_valid.post_id.app_error", nil, "post_id="+o.PostId)
 	}
 
-	if len(o.EmojiName) == 0 || len(o.EmojiName) > 64 || !IsValidAlphaNumHyphenUnderscore(o.EmojiName, false) {
+	validName := regexp.MustCompile(`^[a-zA-Z0-9\-\+_]+$`)
+
+	if len(o.EmojiName) == 0 || len(o.EmojiName) > 64 || !validName.MatchString(o.EmojiName) {
 		return NewLocAppError("Reaction.IsValid", "model.reaction.is_valid.emoji_name.app_error", nil, "emoji_name="+o.EmojiName)
 	}
 

model/reaction_test.go

@@ -42,16 +42,6 @@ func TestReactionIsValid(t *testing.T) {
 	}
 
 	reaction.PostId = NewId()
-	reaction.EmojiName = ""
-	if err := reaction.IsValid(); err == nil {
-		t.Fatal("emoji name should be invalid")
-	}
-
-	reaction.EmojiName = strings.Repeat("a", 65)
-	if err := reaction.IsValid(); err == nil {
-		t.Fatal("emoji name should be invalid")
-	}
-
 	reaction.EmojiName = strings.Repeat("a", 64)
 	if err := reaction.IsValid(); err != nil {
 		t.Fatal(err)
@@ -67,11 +57,26 @@ func TestReactionIsValid(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	reaction.EmojiName = "+1"
+	if err := reaction.IsValid(); err != nil {
+		t.Fatal(err)
+	}
+
 	reaction.EmojiName = "emoji:"
 	if err := reaction.IsValid(); err == nil {
 		t.Fatal(err)
 	}
 
+	reaction.EmojiName = ""
+	if err := reaction.IsValid(); err == nil {
+		t.Fatal("emoji name should be invalid")
+	}
+
+	reaction.EmojiName = strings.Repeat("a", 65)
+	if err := reaction.IsValid(); err == nil {
+		t.Fatal("emoji name should be invalid")
+	}
+
 	reaction.CreateAt = 0
 	if err := reaction.IsValid(); err == nil {
 		t.Fatal("create at should be invalid")