Feature: add download button in case of a bad custom theme

Logic/DetermineLayout.ts

@@ -27,20 +27,42 @@ import { DesugaringContext } from "../Models/ThemeConfig/Conversion/Conversion"
 import { RewriteSpecial } from "../Models/ThemeConfig/Conversion/PrepareLayer"
 import { TagRenderingConfigJson } from "../Models/ThemeConfig/Json/TagRenderingConfigJson"
 import questions from "../assets/tagRenderings/questions.json"
+import Hash from "./Web/Hash"
 
 export default class DetermineLayout {
     private static readonly _knownImages = new Set(Array.from(licenses).map((l) => l.path))
+    private static readonly loadCustomThemeParam = QueryParameters.GetQueryParameter(
+        "userlayout",
+        "false",
+        "If not 'false', a custom (non-official) theme is loaded. This custom layout can be done in multiple ways: \n\n- The hash of the URL contains a base64-encoded .json-file containing the theme definition\n- The hash of the URL contains a lz-compressed .json-file, as generated by the custom theme generator\n- The parameter itself is an URL, in which case that URL will be downloaded. It should point to a .json of a theme"
+    )
+    public static getCustomDefinition(): string {
+        const layoutFromBase64 = decodeURIComponent(DetermineLayout.loadCustomThemeParam.data)
+
+        if (layoutFromBase64.startsWith("http")) {
+            return layoutFromBase64
+        }
+
+        if (layoutFromBase64 !== "false") {
+            // We have to load something from the hash (or from disk)
+            const hash = Hash.hash.data
+            try {
+                JSON.parse(atob(hash))
+                return atob(hash)
+            } catch (e) {
+                // We try to decode with lz-string
+                JSON.parse(Utils.UnMinify(LZString.decompressFromBase64(hash)))
+                return Utils.UnMinify(LZString.decompressFromBase64(hash))
+            }
+        }
+        return undefined
+    }
 
     /**
      * Gets the correct layout for this website
      */
     public static async GetLayout(): Promise<LayoutConfig | undefined> {
-        const loadCustomThemeParam = QueryParameters.GetQueryParameter(
+        const layoutFromBase64 = decodeURIComponent(DetermineLayout.loadCustomThemeParam.data)
-            "userlayout",
-            "false",
-            "If not 'false', a custom (non-official) theme is loaded. This custom layout can be done in multiple ways: \n\n- The hash of the URL contains a base64-encoded .json-file containing the theme definition\n- The hash of the URL contains a lz-compressed .json-file, as generated by the custom theme generator\n- The parameter itself is an URL, in which case that URL will be downloaded. It should point to a .json of a theme"
-        )
-        const layoutFromBase64 = decodeURIComponent(loadCustomThemeParam.data)
 
         if (layoutFromBase64.startsWith("http")) {
             return await DetermineLayout.LoadRemoteTheme(layoutFromBase64)
@@ -48,7 +70,7 @@ export default class DetermineLayout {
 
         if (layoutFromBase64 !== "false") {
             // We have to load something from the hash (or from disk)
-            return DetermineLayout.LoadLayoutFromHash(loadCustomThemeParam)
+            return DetermineLayout.LoadLayoutFromHash(DetermineLayout.loadCustomThemeParam)
         }
 
         let layoutId: string = undefined

index.ts

@@ -1,9 +1,12 @@
-import { Utils } from "./Utils"
 import DetermineLayout from "./Logic/DetermineLayout"
 import ThemeViewState from "./Models/ThemeViewState"
 import SvelteUIElement from "./UI/Base/SvelteUIElement"
 import ThemeViewGUI from "./UI/ThemeViewGUI.svelte"
 import { FixedUiElement } from "./UI/Base/FixedUiElement"
+import Combine from "./UI/Base/Combine"
+import { SubtleButton } from "./UI/Base/SubtleButton"
+import Svg from "./Svg"
+import { Utils } from "./Utils"
 
 // @ts-ignore
 try {
@@ -15,7 +18,17 @@ try {
         })
         .catch((err) => {
             console.error("Error while initializing: ", err, err.stack)
-            new FixedUiElement(err).SetClass("block alert").AttachTo("maindiv")
+            new Combine([
+                new FixedUiElement(err).SetClass("block alert"),
+
+                new SubtleButton(Svg.download_svg(), "Download the raw file").onClick(() =>
+                    Utils.offerContentsAsDownloadableFile(
+                        DetermineLayout.getCustomDefinition(),
+                        "mapcomplete-theme.json",
+                        { mimetype: "application/json" }
+                    )
+                ),
+            ]).AttachTo("maindiv")
         })
 } catch (err) {
     new FixedUiElement(err).SetClass("block alert").AttachTo("maindiv")