Apex Security Check Sample

AccountRegister.page

<apex:page controller="AccountRegisterController" showHeader="true" sidebar="false" tabStyle="Account"  id="page">
    <div id="vf-page">
        <apex:sectionHeader title="{!$ObjectType.Account.Label}" subtitle="Account Register" />
        <apex:form id="form">
            <apex:pageBlock title="Account Register" mode="edit" id="block">
                <apex:pagemessages id="msg"/>
                <apex:pageBlockButtons location="bottom" id="buttons">
                    <apex:commandButton value="   Save   " title="   Save   " action="{!doSave}" reRender="form" id="saveBtn" />
                </apex:pageBlockButtons>
                <apex:pageBlockSection title="Account Information" id="section">
                    <apex:inputField value="{!account.Name}" />
                    <apex:inputField value="{!account.AccountNumber}" />
                    <apex:inputField value="{!account.Phone}" />
                    <apex:inputField value="{!account.Fax}" />
                </apex:pageBlockSection>
            </apex:pageBlock>
        </apex:form>
    </div>
</apex:page>

AccountRegisterController.cls

public with sharing class AccountRegisterController {
    
    private AccountRegisterHelper helper = new AccountRegisterHelper();
    public Account account {get; set;}
    
    public AccountRegisterController() {
        // Default
        this.account = new Account();
        //this.account.AccountNumber = 'A-0001';
        // Check Accessible
        if (!this.helper.isAccessible()) return;
    }
    
    public PageReference doSave() {
        // Check Security
        if (!this.helper.isCreateable()) return null;
        if (!this.helper.isUpdateable()) return null;
        if (!this.helper.isDeletable()) return null;
        
        // Account Upsert
        upsert this.account;
        return new PageReference('/' + this.account.Id);
    }
}

AccountRegisterHelper.cls

public with sharing class AccountRegisterHelper {
    
    public AccountRegisterHelper() {
        
    }
    
    /**
     * isAccessible
     */
    public Boolean isAccessible() {
        Boolean result = true;
        
        if (!Schema.sObjectType.Account.Fields.Name.isAccessible()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Name.Label + ': Not Accessible');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.AccountNumber.isAccessible()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.AccountNumber.Label + ': Not Accessible');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Phone.isAccessible()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Phone.Label + ': Not Accessible');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Fax.isAccessible()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Fax.Label + ': Not Accessible');
            result = false;
        }
        
        return result;
    }

    /**
     * isCreateable
     */
    public Boolean isCreateable() {
        Boolean result = true;
        
        if (!Schema.sObjectType.Account.Fields.Name.isCreateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Name.Label + ': Not Creatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.AccountNumber.isCreateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.AccountNumber.Label + ': Not Creatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Phone.isCreateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Phone.Label + ': Not Creatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Fax.isCreateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Fax.Label + ': Not Creatable');
            result = false;
        }
        
        return result;
    }

    /**
     * isUpdateable
     */
    public Boolean isUpdateable() {
        Boolean result = true;
        
        if (!Schema.sObjectType.Account.Fields.Name.isUpdateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Name.Label + ': Not Updatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.AccountNumber.isUpdateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.AccountNumber.Label + ': Not Updatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Phone.isUpdateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Phone.Label + ': Not Updatable');
            result = false;
        }
        
        if (!Schema.sObjectType.Account.Fields.Fax.isUpdateable()) {
            CommonUtil.msgError('[' + Schema.sObjectType.Account.Label + '] ' + Schema.sObjectType.Account.Fields.Fax.Label + ': Not Updatable');
            result = false;
        }
        
        return result;
    }

    /**
     * isDeletable
     */
    public Boolean isDeletable() {
        Boolean result = true;
        
        if (!Schema.sObjectType.Account.isDeletable()) {
            CommonUtil.msgError(Schema.sObjectType.Account.Label + ': Not Deletable');
            result = false;
        }
        return result;
    }
}

CommonUtil.cls

public with sharing class CommonUtil {
    
    public static void msgError(String prmMsg) {
        ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, prmMsg));
    }
}