refactor(framework): remove the CSP module (#8496)

Previously, we used <style> and <link> tags to style web components due to the lack of browser support for adoptedStyleSheets. However, as  latest version of all relevant browsers now support "adoptedStyleSheets", we are removing all additional functionality that was implemented to compensate for the missing support and rely entirely on "adoptedStyleSheets". As a result, there is no need of additional handling to full-fill Content Security Policy (CSP) requirements, because adoptedStyleSheets are CSP compliant.

BREAKING CHANGE: Removed the `CSP.js` module and the creation of `<style>` and `<link>` tags, as all browsers now support adoptedStyleSheets. The following APIs are not available any more and should not be used:
```ts
import { setUseLinks } from "@ui5/webcomponents-base/dist/CSP.js"
import { setPackageCSSRoot } from "@ui5/webcomponents-base/dist/CSP.js"
import { setPreloadLinks } from "@ui5/webcomponents-base/dist/CSP.js"
```

Related to [#8461](#8461)

Author: nnaydenow

docs/2-advanced/08-CSP.md

@@ -20,9 +20,6 @@ Contains the base files for all Web Components, most notably `@ui5/webcomponents
  Components    | `import applyDirection from "@ui5/webcomponents-base/dist/locale/applyDirection.js"`| Applies direction ("ltr"/"rtl") - re-renders all RTL-aware components     |
  Components    | `import { setCustomElementsScopingSuffix } from "@ui5/webcomponents-base/dist/CustomElementsScope.js"`| Adds suffix to the tag names of all components          |
  Components    | `@ui5/webcomponents-base/dist/util/InvisibleMessage.js`   | Provides a way to expose dynamic content changes that can be announced by screen readers   |
- CSP compliance| `import { setPackageCSSRoot } from "@ui5/webcomponents-base/dist/CSP.js"`| Sets directory path where the CSS resources for given package will be served from    |
- CSP compliance| `import { setUseLinks } from "@ui5/webcomponents-base/dist/CSP.js"`      | Enables or disables the usage of `<link>` tags instead of `<style>` tags             |
- CSP compliance| `import { setPreloadLinks } from "@ui5/webcomponents-base/dist/CSP.js"`  | Enables or disables the preloading of `<link>` tags                                  |
 
 ### `applyDirection.js`
 - `applyDirection`
@@ -42,11 +39,6 @@ Contains the base files for all Web Components, most notably `@ui5/webcomponents
 
  - `ignoreCustomElements`
 
-###  `CSP.js`
- - `setPackageCSSRoot` 
- - `setUseLinks`
- - `setPreloadLinks`
-
 ### `i18nBundle.js`
 
  - `registerI18nLoader`

docs/2-advanced/09-scrollbars-customization.md docs/2-advanced/08-scrollbars-customization.md

@@ -56,13 +56,6 @@ import { registerIconLoader } from "./dist/asset-registries/Icons.js";
 // Boot.ts
 import { attachBoot } from "./dist/Boot.js";
 
-// CSP.ts
-import {
-	setPackageCSSRoot,
-	setUseLinks,
-	setPreloadLinks,
-} from "./dist/CSP.js";
-
 // CustomElementsScope.ts
 import {
 	setCustomElementsScopingSuffix,
@@ -172,11 +165,6 @@ export {
 	// Boot.ts
 	attachBoot,
 
-	// CSP.ts
-	setPackageCSSRoot,
-	setUseLinks,
-	setPreloadLinks,
-
 	// CustomElementsScope.ts
 	setCustomElementsScopingSuffix,
 	getCustomElementsScopingSuffix,

docs/2-advanced/10-ignore-custom-elements.md docs/2-advanced/09-ignore-custom-elements.md

@@ -1,8 +1,4 @@
-import createStyleInHead from "./util/createStyleInHead.js";
-import createLinkInHead from "./util/createLinkInHead.js";
-import { shouldUseLinks, getUrl } from "./CSP.js";
 import { StyleData, StyleDataCSP } from "./types.js";
-import { isSafari } from "./Device.js";
 import { getCurrentRuntimeIndex, compareRuntimes } from "./Runtimes.js";
 
 const isSSR = typeof document === "undefined";
@@ -22,87 +18,34 @@ const createStyle = (data: StyleData, name: string, value = "", theme?: string)
 	const content = typeof data === "string" ? data : data.content;
 	const currentRuntimeIndex = getCurrentRuntimeIndex();
 
-	if (shouldUseLinks()) {
-		const attributes = {} as Record<string, any>;
-		attributes[name] = value;
-		if (theme) {
-			attributes["data-ui5-runtime-index"] = currentRuntimeIndex;
-			attributes["data-ui5-theme"] = theme;
-		}
-		const href = getUrl((data as StyleDataCSP).packageName, (data as StyleDataCSP).fileName);
-		createLinkInHead(href, attributes);
-	} else if (document.adoptedStyleSheets && !isSafari()) {
-		const stylesheet = new CSSStyleSheet();
-		stylesheet.replaceSync(content);
-		(stylesheet as Record<string, any>)._ui5StyleId = getStyleId(name, value); // set an id so that we can find the style later
-		if (theme) {
-			(stylesheet as Record<string, any>)._ui5RuntimeIndex = currentRuntimeIndex;
-			(stylesheet as Record<string, any>)._ui5Theme = theme;
-		}
-		document.adoptedStyleSheets = [...document.adoptedStyleSheets, stylesheet];
-	} else {
-		const attributes = {} as Record<string, any>;
-		attributes[name] = value;
-		if (theme) {
-			attributes["data-ui5-runtime-index"] = currentRuntimeIndex;
-			attributes["data-ui5-theme"] = theme;
-		}
-		createStyleInHead(content, attributes);
+	const stylesheet = new CSSStyleSheet();
+	stylesheet.replaceSync(content);
+	(stylesheet as Record<string, any>)._ui5StyleId = getStyleId(name, value); // set an id so that we can find the style later
+	if (theme) {
+		(stylesheet as Record<string, any>)._ui5RuntimeIndex = currentRuntimeIndex;
+		(stylesheet as Record<string, any>)._ui5Theme = theme;
 	}
+	document.adoptedStyleSheets = [...document.adoptedStyleSheets, stylesheet];
 };
 
 const updateStyle = (data: StyleData, name: string, value = "", theme?: string) => {
 	const content = typeof data === "string" ? data : data.content;
 	const currentRuntimeIndex = getCurrentRuntimeIndex();
 
-	if (shouldUseLinks()) {
-		const link = document.querySelector(`head>link[${name}="${value}"]`) as HTMLLinkElement;
-		const href = getUrl((data as StyleDataCSP).packageName, (data as StyleDataCSP).fileName);
-
-		if (!theme) {
-			link.href = href;
-		} else {
-			const linkRuntimeIndex = link.getAttribute("data-ui5-runtime-index") || undefined;
-			const linkTheme = link.getAttribute("data-ui5-theme");
-			if (linkTheme !== theme || shouldUpdate(linkRuntimeIndex)) {
-				link.href = href;
-				link.setAttribute("data-ui5-runtime-index", String(currentRuntimeIndex));
-				link.setAttribute("data-ui5-theme", theme);
-			}
-		}
-	} else if (document.adoptedStyleSheets && !isSafari()) {
-		const stylesheet = document.adoptedStyleSheets.find(sh => (sh as Record<string, any>)._ui5StyleId === getStyleId(name, value));
-		if (!stylesheet) {
-			return;
-		}
+	const stylesheet = document.adoptedStyleSheets.find(sh => (sh as Record<string, any>)._ui5StyleId === getStyleId(name, value));
+	if (!stylesheet) {
+		return;
+	}
 
-		if (!theme) {
-			stylesheet.replaceSync(content || "");
-		} else {
-			const stylesheetRuntimeIndex: string | undefined = (stylesheet as Record<string, any>)._ui5RuntimeIndex;
-			const stylesheetTheme: string | undefined = (stylesheet as Record<string, any>)._ui5Theme;
-			if (stylesheetTheme !== theme || shouldUpdate(stylesheetRuntimeIndex)) {
-				stylesheet.replaceSync(content || "");
-				(stylesheet as Record<string, any>)._ui5RuntimeIndex = String(currentRuntimeIndex);
-				(stylesheet as Record<string, any>)._ui5Theme = theme;
-			}
-		}
+	if (!theme) {
+		stylesheet.replaceSync(content || "");
 	} else {
-		const style = document.querySelector(`head>style[${name}="${value}"]`);
-		if (!style) {
-			return;
-		}
-
-		if (!theme) {
-			style.textContent = content || "";
-		} else {
-			const styleRuntimeIndex = style.getAttribute("data-ui5-runtime-index") || undefined;
-			const styleTheme = style.getAttribute("data-ui5-theme");
-			if (styleTheme !== theme || shouldUpdate(styleRuntimeIndex)) {
-				style.textContent = content || "";
-				style.setAttribute("data-ui5-runtime-index", String(currentRuntimeIndex));
-				style.setAttribute("data-ui5-theme", theme);
-			}
+		const stylesheetRuntimeIndex: string | undefined = (stylesheet as Record<string, any>)._ui5RuntimeIndex;
+		const stylesheetTheme: string | undefined = (stylesheet as Record<string, any>)._ui5Theme;
+		if (stylesheetTheme !== theme || shouldUpdate(stylesheetRuntimeIndex)) {
+			stylesheet.replaceSync(content || "");
+			(stylesheet as Record<string, any>)._ui5RuntimeIndex = String(currentRuntimeIndex);
+			(stylesheet as Record<string, any>)._ui5Theme = theme;
 		}
 	}
 };
@@ -111,29 +54,12 @@ const hasStyle = (name: string, value = ""): boolean => {
 	if (isSSR) {
 		return true;
 	}
-	if (shouldUseLinks()) {
-		return !!document.querySelector(`head>link[${name}="${value}"]`);
-	}
 
-	const styleElement = document.querySelector(`head>style[${name}="${value}"]`);
-
-	if (document.adoptedStyleSheets && !isSafari()) {
-		return !!styleElement || !!document.adoptedStyleSheets.find(sh => (sh as Record<string, any>)._ui5StyleId === getStyleId(name, value));
-	}
-
-	return !!styleElement;
+	return !!document.adoptedStyleSheets.find(sh => (sh as Record<string, any>)._ui5StyleId === getStyleId(name, value));
 };
 
 const removeStyle = (name: string, value = "") => {
-	if (shouldUseLinks()) {
-		const linkElement = document.querySelector(`head>link[${name}="${value}"]`);
-		linkElement?.parentElement?.removeChild(linkElement);
-	} else if (document.adoptedStyleSheets && !isSafari()) {
-		document.adoptedStyleSheets = document.adoptedStyleSheets.filter(sh => (sh as Record<string, any>)._ui5StyleId !== getStyleId(name, value));
-	} else {
-		const styleElement = document.querySelector(`head > style[${name}="${value}"]`);
-		styleElement?.parentElement?.removeChild(styleElement);
-	}
+	document.adoptedStyleSheets = document.adoptedStyleSheets.filter(sh => (sh as Record<string, any>)._ui5StyleId !== getStyleId(name, value));
 };
 
 const createOrUpdateStyle = (data: StyleData, name: string, value = "", theme?: string) => {

packages/base/README.md

@@ -25,7 +25,6 @@ import isValidPropertyName from "./util/isValidPropertyName.js";
 import { getSlotName, getSlottedNodesList } from "./util/SlotsHelper.js";
 import arraysAreEqual from "./util/arraysAreEqual.js";
 import { markAsRtlAware } from "./locale/RTLAwareRegistry.js";
-import preloadLinks from "./theming/preloadLinks.js";
 import executeTemplate from "./renderer/executeTemplate.js";
 import type { TemplateFunction, TemplateFunctionResult } from "./renderer/executeTemplate.js";
 import type { PromiseResolve, ComponentStylesData, ClassMap } from "./types.js";
@@ -35,7 +34,7 @@ let autoId = 0;
 const elementTimeouts = new Map<string, Promise<void>>();
 const uniqueDependenciesCache = new Map<typeof UI5Element, Array<typeof UI5Element>>();
 
-type Renderer = (templateResult: TemplateFunctionResult, container: HTMLElement | DocumentFragment, styleStrOrHrefsArr: string | Array<string> | undefined, forStaticArea: boolean, options: RendererOptions) => void;
+type Renderer = (templateResult: TemplateFunctionResult, container: HTMLElement | DocumentFragment, forStaticArea: boolean, options: RendererOptions) => void;
 
 type RendererOptions = {
 	/**
@@ -1139,7 +1138,6 @@ abstract class UI5Element extends HTMLElement {
 			this._generateAccessors();
 			registerTag(tag);
 			customElements.define(tag, this as unknown as CustomElementConstructor);
-			preloadLinks(this);
 		}
 		return this;
 	}