src/Orchard.Web/Modules/Orchard.Fields/Drivers/MediaPickerFieldDriver.cs

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using System;
using System.Linq;
using Orchard.Fields.Settings;
using Orchard.FileSystems.WebSite;
using Orchard.ContentManagement;
using Orchard.ContentManagement.Drivers;
using Orchard.ContentManagement.Handlers;
using Orchard.Localization;
using Orchard.Utility.Extensions;

namespace Orchard.Fields.Drivers {
    public class MediaPickerFieldDriver : ContentFieldDriver<Fields.MediaPickerField> {
        private readonly IWebSiteFolder _webSiteFolder;

        public MediaPickerFieldDriver(IWebSiteFolder webSiteFolder) {
            _webSiteFolder = webSiteFolder;
            T = NullLocalizer.Instance;
        }

        public Localizer T { get; set; }

        private static string GetPrefix(Fields.MediaPickerField field, ContentPart part) {
            return part.PartDefinition.Name + "." + field.Name;
        }

        private static string GetDifferentiator(Fields.MediaPickerField field, ContentPart part) {
            return field.Name;
        }

        protected override DriverResult Display(ContentPart part, Fields.MediaPickerField field, string displayType, dynamic shapeHelper) {
            return ContentShape("Fields_MediaPicker", GetDifferentiator(field, part),
                () => shapeHelper.Fields_MediaPicker());
        }

        protected override DriverResult Editor(ContentPart part, Fields.MediaPickerField field, dynamic shapeHelper) {
            return ContentShape("Fields_MediaPicker_Edit", GetDifferentiator(field, part),
                () => shapeHelper.EditorTemplate(TemplateName: "Fields/MediaPicker.Edit", Model: field, Prefix: GetPrefix(field, part)));
        }

        protected override DriverResult Editor(ContentPart part, Fields.MediaPickerField field, IUpdateModel updater, dynamic shapeHelper) {
            // if the model could not be bound, don't try to validate its properties
            if (updater.TryUpdateModel(field, GetPrefix(field, part), null, null)) {
                var settings = field.PartFieldDefinition.Settings.GetModel<MediaPickerFieldSettings>();

                var extensions = String.IsNullOrWhiteSpace(settings.AllowedExtensions)
                        ? new string[0]
                        : settings.AllowedExtensions.Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries);

                if (extensions.Any() && field.Url != null && !extensions.Any(x => field.Url.EndsWith(x, StringComparison.OrdinalIgnoreCase))) {
                    updater.AddModelError("Url", T("The field {0} must have one of these extensions: {1}", field.Name.CamelFriendly(), settings.AllowedExtensions));
                }

                if (settings.Required && String.IsNullOrWhiteSpace(field.Url)) {
                    updater.AddModelError("Url", T("The field {0} is mandatory", field.Name.CamelFriendly()));
                }
            }

            return Editor(part, field, shapeHelper);
        }