introduce Resource Declaration and Location properties to offer more resource management options for developers

Oqtane.Client/Modules/ModuleBase.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components;
 using Oqtane.Shared;
 using Oqtane.Models;
 using System.Threading.Tasks;
@@ -53,12 +53,15 @@ namespace Oqtane.Modules
                 if (Resources != null && Resources.Exists(item => item.ResourceType == ResourceType.Script))
                 {
                     var scripts = new List<object>();
-                    foreach (Resource resource in Resources.Where(item => item.ResourceType == ResourceType.Script))
+                    foreach (Resource resource in Resources.Where(item => item.ResourceType == ResourceType.Script && item.Declaration != ResourceDeclaration.Global))
                     {
                         scripts.Add(new { href = resource.Url, bundle = resource.Bundle ?? "", integrity = resource.Integrity ?? "", crossorigin = resource.CrossOrigin ?? "" });
                     }
-                    var interop = new Interop(JSRuntime);
+                    if (scripts.Any())
-                    await interop.IncludeScripts(scripts.ToArray());
+                    {
+                        var interop = new Interop(JSRuntime);
+                        await interop.IncludeScripts(scripts.ToArray());
+                    }
                 }
             }
         }

Oqtane.Client/Themes/ThemeBase.cs

@@ -32,12 +32,15 @@ namespace Oqtane.Themes
                 if (Resources != null && Resources.Exists(item => item.ResourceType == ResourceType.Script))
                 {
                     var scripts = new List<object>();
-                    foreach (Resource resource in Resources.Where(item => item.ResourceType == ResourceType.Script))
+                    foreach (Resource resource in Resources.Where(item => item.ResourceType == ResourceType.Script && item.Declaration != ResourceDeclaration.Global))
                     {
                         scripts.Add(new { href = resource.Url, bundle = resource.Bundle ?? "", integrity = resource.Integrity ?? "", crossorigin = resource.CrossOrigin ?? "" });
                     }
-                    var interop = new Interop(JSRuntime);
+                    if (scripts.Any())
-                    await interop.IncludeScripts(scripts.ToArray());
+                    {
+                        var interop = new Interop(JSRuntime);
+                        await interop.IncludeScripts(scripts.ToArray());
+                    }
                 }
             }
         }

Oqtane.Client/UI/ThemeBuilder.razor

@@ -33,11 +33,14 @@
         // manage stylesheets for this page 
         string batch = DateTime.Now.ToString("yyyyMMddHHmmssfff");
         var links = new List<object>();
-        foreach (Resource resource in PageState.Page.Resources.Where(item => item.ResourceType == ResourceType.Stylesheet))
+        foreach (Resource resource in PageState.Page.Resources.Where(item => item.ResourceType == ResourceType.Stylesheet && item.Declaration != ResourceDeclaration.Global))
         {
             links.Add(new { id = "app-stylesheet-" + batch + "-" + (links.Count + 1).ToString("00"), rel = "stylesheet", href = resource.Url, type = "text/css", integrity = resource.Integrity ?? "", crossorigin = resource.CrossOrigin ?? "", key = "" });
         }
-        await interop.IncludeLinks(links.ToArray());
+        if (links.Any())
+        {
+            await interop.IncludeLinks(links.ToArray());
+        }
         await interop.RemoveElementsById("app-stylesheet", "", "app-stylesheet-" + batch + "-00");
 
         // add favicon
@@ -46,7 +49,7 @@
             await interop.IncludeLink("app-favicon", "shortcut icon", Utilities.ContentUrl(PageState.Alias, PageState.Site.FaviconFileId.Value), "image/x-icon", "", "", "id");
         }
         // add PWA support
-        if (PageState.Site.PwaIsEnabled)
+        if (PageState.Site.PwaIsEnabled && PageState.Site.PwaAppIconFileId != null && PageState.Site.PwaSplashIconFileId != null)
         {
             await InitializePwa(interop);
         }

Oqtane.Server/Infrastructure/Interfaces/IHostResources.cs

@@ -1,8 +1,10 @@
-using Oqtane.Models;
+using Oqtane.Models;
 using System.Collections.Generic;
 
 namespace Oqtane.Infrastructure
 {
+    // Obsolete - use the Resources collection as part of IModuleControl or IThemeCOntrol and use the ResourceDeclaration.Global property
+    // note - not using the [Obsolete] attribute in this case as we want to avoid compilation warnings in the core framework
     public interface IHostResources
     {
         List<Resource> Resources { get; } // identifies global resources for an application

Oqtane.Server/Pages/_Host.cshtml

@@ -1,4 +1,4 @@
-@page "/"
+@page "/"
 @namespace Oqtane.Pages
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
 @using System.Globalization
@@ -24,7 +24,7 @@
     <link id="app-manifest" rel="manifest" />
     <link rel="stylesheet" href="css/app.css" />
     <script src="js/loadjs.min.js"></script>
-    @Html.Raw(@Model.Resources)
+    @Html.Raw(@Model.HeadResources)
 </head>
 <body>
     @(Html.AntiForgeryToken())
@@ -53,5 +53,6 @@
     {
         <script src="_framework/blazor.server.js"></script>
     }
+    @Html.Raw(@Model.BodyResources)
 </body>
 </html>

Oqtane.Server/Pages/_Host.cshtml.cs

@@ -1,6 +1,9 @@
-using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.Mvc.RazorPages;
 using Oqtane.Infrastructure;
 using Oqtane.Shared;
+using Oqtane.Modules;
+using Oqtane.Models;
+using Oqtane.Themes;
 using System;
 using System.Linq;
 using System.Reflection;
@@ -9,33 +12,106 @@ namespace Oqtane.Pages
 {
     public class HostModel : PageModel
     {
-        public string Resources = "";
+        public string HeadResources = "";
+        public string BodyResources = "";
 
         public void OnGet()
         {
             var assemblies = AppDomain.CurrentDomain.GetOqtaneAssemblies();
             foreach (Assembly assembly in assemblies)
             {
-                var types = assembly.GetTypes().Where(item => item.GetInterfaces().Contains(typeof(IHostResources)));
+                ProcessHostResources(assembly);
-                foreach (var type in types)
+                ProcessModuleControls(assembly);
+                ProcessThemeControls(assembly);
+            }
+        }
+
+        private void ProcessHostResources(Assembly assembly)
+        {
+            var types = assembly.GetTypes().Where(item => item.GetInterfaces().Contains(typeof(IHostResources)));
+            foreach (var type in types)
+            {
+                var obj = Activator.CreateInstance(type) as IHostResources;
+                foreach (var resource in obj.Resources)
+                {
+                    ProcessResource(resource);
+                }
+            }
+        }
+
+        private void ProcessModuleControls(Assembly assembly)
+        {
+            var types = assembly.GetTypes().Where(item => item.GetInterfaces().Contains(typeof(IModuleControl)));
+            foreach (var type in types)
+            {
+                // Check if type should be ignored
+                if (type.IsOqtaneIgnore()) continue;
+
+                var obj = Activator.CreateInstance(type) as IModuleControl;
+                if (obj.Resources != null)
                 {
-                    var obj = Activator.CreateInstance(type) as IHostResources;
                     foreach (var resource in obj.Resources)
                     {
-                        switch (resource.ResourceType)
+                        if (resource.Declaration == ResourceDeclaration.Global)
                         {
-                            case ResourceType.Stylesheet:
+                            ProcessResource(resource);
-                                Resources += "<link rel=\"stylesheet\" href=\"" + resource.Url + "\"" + CrossOrigin(resource.CrossOrigin) + Integrity(resource.Integrity) + " />" + Environment.NewLine;
-                                break;
-                            case ResourceType.Script:
-                                Resources += "<script src=\"" + resource.Url + "\"" + CrossOrigin(resource.CrossOrigin) + Integrity(resource.Integrity) + "></script>" + Environment.NewLine;
-                                break;
                         }
                     }
                 }
             }
         }
 
+        private void ProcessThemeControls(Assembly assembly)
+        {
+            var types = assembly.GetTypes().Where(item => item.GetInterfaces().Contains(typeof(IThemeControl)));
+            foreach (var type in types)
+            {
+                // Check if type should be ignored
+                if (type.IsOqtaneIgnore()) continue;
+
+                var obj = Activator.CreateInstance(type) as IThemeControl;
+                if (obj.Resources != null)
+                {
+                    foreach (var resource in obj.Resources)
+                    {
+                        if (resource.Declaration == ResourceDeclaration.Global)
+                        {
+                            ProcessResource(resource);
+                        }
+                    }
+                }
+            }
+        }
+
+        private void ProcessResource(Resource resource)
+        {
+            switch (resource.ResourceType)
+            {
+                case ResourceType.Stylesheet:
+                    if (!HeadResources.Contains(resource.Url, StringComparison.OrdinalIgnoreCase))
+                    {
+                        HeadResources += "<link rel=\"stylesheet\" href=\"" + resource.Url + "\"" + CrossOrigin(resource.CrossOrigin) + Integrity(resource.Integrity) + " />" + Environment.NewLine;
+                    }
+                    break;
+                case ResourceType.Script:
+                    if (resource.Location == Shared.ResourceLocation.Body)
+                    {
+                        if (!BodyResources.Contains(resource.Url, StringComparison.OrdinalIgnoreCase))
+                        {
+                            BodyResources += "<script src=\"" + resource.Url + "\"" + CrossOrigin(resource.CrossOrigin) + Integrity(resource.Integrity) + "></script>" + Environment.NewLine;
+                        }
+                    }
+                    else
+                    {
+                        if (!HeadResources.Contains(resource.Url, StringComparison.OrdinalIgnoreCase))
+                        {
+                            HeadResources += "<script src=\"" + resource.Url + "\"" + CrossOrigin(resource.CrossOrigin) + Integrity(resource.Integrity) + "></script>" + Environment.NewLine;
+                        }
+                    }
+                    break;
+            }
+        }
+
         private string CrossOrigin(string crossorigin)
         {
             if (!string.IsNullOrEmpty(crossorigin))

Oqtane.Shared/Enums/ResourceDeclaration.cs

@@ -0,0 +1,8 @@
+namespace Oqtane.Shared
+{
+    public enum ResourceDeclaration
+    {
+        Local,
+        Global
+    }
+}

Oqtane.Shared/Enums/ResourceLocation.cs

@@ -0,0 +1,8 @@
+namespace Oqtane.Shared
+{
+    public enum ResourceLocation
+    {
+        Head,
+        Body
+    }
+}

Oqtane.Shared/Models/Resource.cs

@@ -1,4 +1,4 @@
-using Oqtane.Shared;
+using Oqtane.Shared;
 
 namespace Oqtane.Models
 {
@@ -9,5 +9,7 @@ namespace Oqtane.Models
         public string Integrity { get; set; }
         public string CrossOrigin { get; set; }
         public string Bundle { get; set; }
+        public ResourceDeclaration Declaration { get; set; }
+        public ResourceLocation Location { get; set; }
     }
 }