feat(frontend): Add HTML result rendering (#1160)

* feat(frontend): Add HTML result rendering

* fix(frontend): Add reference for XSS

* fix(frontend): Require approval only in apps

* fix(frontend): Require approval in public apps

frontend/src/lib/components/DisplayResult.svelte

@@ -7,11 +7,13 @@
 	import autosize from 'svelte-autosize'
 
 	export let result: any
+	export let requireHtmlApproval = false
 
 	let resultKind:
 		| 'json'
 		| 'table-col'
 		| 'table-row'
+		| 'html'
 		| 'png'
 		| 'file'
 		| 'jpeg'
@@ -19,9 +21,11 @@
 		| 'error'
 		| 'approval'
 		| undefined
+
 	$: resultKind = inferResultKind(result)
 
 	let forceJson = false
+	let enableHtml = false
 
 	function isRectangularArray(obj: any) {
 		if (!Array.isArray(obj) || obj.length == 0) {
@@ -53,6 +57,8 @@
 					return 'table-row'
 				} else if (keys.map((k) => Array.isArray(result[k])).reduce((a, b) => a && b)) {
 					return 'table-col'
+				} else if (keys.length == 1 && keys[0] == 'html') {
+					return 'html'
 				} else if (keys.length == 1 && keys[0] == 'png') {
 					return 'png'
 				} else if (keys.length == 1 && keys[0] == 'jpeg') {
@@ -119,6 +125,34 @@
 					</tbody>
 				</TableCustom>
 			</div>
+		{:else if !forceJson && resultKind == 'html'}
+			<div class="h-full">
+				{#if !requireHtmlApproval || enableHtml}
+					{@html result.html}
+				{:else}
+					<div class="font-main text-sm">
+						<div class="flex flex-col">
+							<div class="bg-red-400 py-1 rounded-t text-white font-bold text-center">
+								Warning
+							</div>
+							<p
+								class="text-gray-600 mb-2 text-left border-2 !border-t-0 rounded-b border-red-400 overflow-auto p-1"
+							>Rendering HTML can expose you to <a href="https://owasp.org/www-community/attacks/xss/" target="_blank" rel="noreferrer" class="hover:underline">XSS attacks</a>.
+Only enable it if you trust the author of the script.
+							</p>
+						</div>
+						<div class="center-center">
+							<Button
+								size="sm"
+								color="dark"
+								on:click={() => enableHtml = true}
+							>
+								Enable HTML rendering
+							</Button>
+						</div>
+					</div>
+				{/if}
+			</div>
 		{:else if !forceJson && resultKind == 'png'}
 			<div class="h-full"
 				><img alt="png rendered" class="w-auto h-full" src="data:image/png;base64,{result.png}" />

frontend/src/lib/components/apps/components/DisplayComponent.svelte

@@ -1,11 +1,14 @@
 <script lang="ts">
 	import DisplayResult from '$lib/components/DisplayResult.svelte'
+	import { getContext } from 'svelte'
 	import type { AppInput } from '../inputType'
+	import { IS_APP_PUBLIC_CONTEXT_KEY } from '../types'
 	import RunnableWrapper from './helpers/RunnableWrapper.svelte'
 
 	export let id: string
 	export let componentInput: AppInput | undefined
 
+	const requireHtmlApproval = getContext<boolean | undefined>(IS_APP_PUBLIC_CONTEXT_KEY)
 	let result: any = undefined
 
 	export const staticOutputs: string[] = ['result', 'loading']
@@ -16,6 +19,6 @@
 		Results
 	</div>
 	<div class="p-2">
-		<DisplayResult {result} />
+		<DisplayResult {result} {requireHtmlApproval} />
 	</div>
 </RunnableWrapper>

frontend/src/lib/components/apps/types.ts

@@ -179,4 +179,6 @@ export type AppEditorContext = {
 export type EditorMode = 'dnd' | 'preview'
 export type EditorBreakpoint = 'sm' | 'lg'
 
+export const IS_APP_PUBLIC_CONTEXT_KEY = 'isAppPublicContext' as const
+
 type ComponentID = string

frontend/src/routes/public/[workspace]/[...secret]/+page.svelte

@@ -2,12 +2,13 @@
 	import { browser } from '$app/environment'
 	import { page } from '$app/stores'
 	import AppPreview from '$lib/components/apps/editor/AppPreview.svelte'
-	import type { EditorBreakpoint } from '$lib/components/apps/types'
+	import { IS_APP_PUBLIC_CONTEXT_KEY, type EditorBreakpoint } from '$lib/components/apps/types'
 
 	import { Alert, Skeleton } from '$lib/components/common'
 	import { WindmillIcon } from '$lib/components/icons'
 	import { AppService, AppWithLastVersion, GlobalUserInfo, UserService } from '$lib/gen'
 	import { userStore } from '$lib/stores'
+	import { setContext } from 'svelte'
 	import github from 'svelte-highlight/styles/github'
 	import { writable } from 'svelte/store'
 
@@ -15,6 +16,8 @@
 	let user: GlobalUserInfo | undefined = undefined
 	let notExists = false
 
+	setContext(IS_APP_PUBLIC_CONTEXT_KEY, true)
+
 	async function loadApp() {
 		try {
 			app = await AppService.getPublicAppBySecret({