Adding page size option to LDAP (#3439)

model/config.go

@@ -208,6 +208,7 @@ type LdapSettings struct {
 	// Advanced
 	SkipCertificateVerification *bool
 	QueryTimeout                *int
+	MaxPageSize                 *int
 
 	// Customization
 	LoginFieldName *string
@@ -526,6 +527,11 @@ func (o *Config) SetDefaults() {
 		*o.LdapSettings.QueryTimeout = 60
 	}
 
+	if o.LdapSettings.MaxPageSize == nil {
+		o.LdapSettings.MaxPageSize = new(int)
+		*o.LdapSettings.MaxPageSize = 0
+	}
+
 	if o.LdapSettings.LoginFieldName == nil {
 		o.LdapSettings.LoginFieldName = new(string)
 		*o.LdapSettings.LoginFieldName = ""
@@ -724,6 +730,10 @@ func (o *Config) IsValid() *AppError {
 		return NewLocAppError("Config.IsValid", "model.config.is_valid.ldap_sync_interval.app_error", nil, "")
 	}
 
+	if *o.LdapSettings.MaxPageSize < 0 {
+		return NewLocAppError("Config.IsValid", "model.config.is_valid.ldap_max_page_size.app_error", nil, "")
+	}
+
 	if *o.LdapSettings.Enable {
 		if *o.LdapSettings.LdapServer == "" ||
 			*o.LdapSettings.BaseDN == "" ||