Css inliner tuning (#3337)
* tracker: don't send double sheets * tracker: don't send double sheets * tracker: slot checker * add slot tag to custom elements --------- Co-authored-by: nick-delirium <nikita@openreplay.com>
This commit is contained in:
Andrey Babushkin
Delirium
parent
3fd506a812
commit
ab0d4cfb62
3 changed files with 272 additions and 64 deletions
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@ -449,9 +449,8 @@ export default class DOMManager extends ListWalker<Message> {
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logger.error('CreateIFrameDocument: Node not found', msg);
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return;
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}
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// shadow DOM for a custom element
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const isCustomElement = vElem.tagName.includes('-');
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// shadow DOM for a custom element + SALESFORCE (<slot>)
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const isCustomElement = vElem.tagName.includes('-') || vElem.tagName === 'SLOT';
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const isNotActualIframe = !["IFRAME", "FRAME"].includes(vElem.tagName.toUpperCase());
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const isLikelyShadowRoot = isCustomElement && isNotActualIframe;
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@ -1,3 +1,5 @@
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let fakeIdHolder = 1000000 * 99;
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export function inlineRemoteCss(
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node: HTMLLinkElement,
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id: number,
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@ -5,83 +7,289 @@ export function inlineRemoteCss(
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getNextID: () => number,
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insertRule: (id: number, cssText: string, index: number, baseHref: string) => any[],
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addOwner: (sheetId: number, ownerId: number) => any[],
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forceFetch?: boolean,
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sendPlain?: boolean,
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onPlain?: (cssText: string, id: number) => void,
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) {
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const sheetId = sendPlain ? null : getNextID();
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if (!sendPlain) {
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addOwner(sheetId!, id);
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}
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const sheet = node.sheet;
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const sheetId = getNextID()
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addOwner(sheetId, id);
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const processRules = (rules: CSSRuleList) => {
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if (rules.length) {
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setTimeout(() => {
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for (let i = 0; i < rules.length; i++) {
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const rule = rules[i];
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insertRule(sheetId, rule.cssText, i, baseHref);
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}
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}, 0)
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}
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};
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const processCssText = (cssText: string) => {
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cssText = cssText.replace(/\/\*[\s\S]*?\*\//g, '');
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const ruleTexts: string[] = [];
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let depth = 0;
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let currentRule = '';
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for (let i = 0; i < cssText.length; i++) {
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const char = cssText[i];
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if (char === '{') {
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depth++;
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} else if (char === '}') {
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depth--;
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if (depth === 0) {
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currentRule += char;
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ruleTexts.push(currentRule.trim());
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currentRule = '';
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continue;
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}
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}
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currentRule += char;
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}
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for (let i = 0; i < ruleTexts.length; i++) {
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const ruleText = ruleTexts[i];
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insertRule(sheetId, ruleText, i, baseHref);
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}
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};
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if (sheet) {
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if (sheet && !forceFetch) {
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try {
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const rules = sheet.cssRules;
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processRules(rules);
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const cssText = stringifyStylesheet(sheet);
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if (cssText) {
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processCssText(cssText);
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return;
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}
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} catch (e) {
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const href = node.href;
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if (href) {
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fetch(href)
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// console.warn("Could not stringify sheet, falling back to fetch:", e);
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}
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}
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// Fall back to fetching if we couldn't get or stringify the sheet
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if (node.href) {
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fetch(node.href)
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.then(response => {
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if (!response.ok) {
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throw new Error(`Failed to fetch CSS: ${response.status}`);
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throw new Error(`response status ${response.status}`);
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}
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return response.text();
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})
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.then(cssText => {
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if (sendPlain && onPlain) {
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onPlain(cssText, fakeIdHolder++);
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} else {
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processCssText(cssText);
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}
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})
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.catch(error => {
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console.error(`Failed to fetch or process CSS from ${href}:`, error);
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console.error(`OpenReplay: Failed to fetch CSS from ${node.href}:`, error);
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});
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}
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function processCssText(cssText: string) {
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// Remove comments
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cssText = cssText.replace(/\/\*[\s\S]*?\*\//g, '');
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// Parse and process the CSS text to extract rules
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const ruleTexts = parseCSS(cssText);
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for (let i = 0; i < ruleTexts.length; i++) {
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insertRule(sheetId!, ruleTexts[i], i, baseHref);
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}
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} else if (node.href) {
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fetch(node.href)
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.then(response => response.text())
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.then(cssText => {
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processCssText(cssText);
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})
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.catch(error => {
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console.error(`Failed to fetch CSS from ${node.href}:`, error);
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});
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}
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function parseCSS(cssText: string): string[] {
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const rules: string[] = [];
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let inComment = false;
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let inString = false;
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let stringChar = '';
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let braceLevel = 0;
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let currentRule = '';
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for (let i = 0; i < cssText.length; i++) {
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const char = cssText[i];
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const nextChar = cssText[i + 1] || '';
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// comments
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if (!inString && char === '/' && nextChar === '*') {
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inComment = true;
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i++; // Skip the next character
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continue;
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}
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if (inComment) {
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if (char === '*' && nextChar === '/') {
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inComment = false;
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i++; // Skip the next character
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}
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continue;
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}
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if (!inString && (char === '"' || char === "'")) {
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inString = true;
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stringChar = char;
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currentRule += char;
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continue;
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}
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if (inString) {
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currentRule += char;
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if (char === stringChar && cssText[i - 1] !== '\\') {
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inString = false;
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}
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continue;
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}
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currentRule += char;
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if (char === '{') {
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braceLevel++;
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} else if (char === '}') {
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braceLevel--;
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if (braceLevel === 0) {
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// End of a top-level rule
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rules.push(currentRule.trim());
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currentRule = '';
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}
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}
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}
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// Handle any remaining text (should be rare)
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if (currentRule.trim()) {
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rules.push(currentRule.trim());
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}
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return rules;
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}
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function stringifyStylesheet(s: CSSStyleSheet): string | null {
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try {
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const rules = s.rules || s.cssRules;
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if (!rules) {
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return null;
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}
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let sheetHref = s.href;
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if (!sheetHref && s.ownerNode && (s.ownerNode as HTMLElement).ownerDocument) {
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// an inline <style> element
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sheetHref = (s.ownerNode as HTMLElement).ownerDocument.location.href;
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}
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const stringifiedRules = Array.from(rules, (rule: CSSRule) =>
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stringifyRule(rule, sheetHref)
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).join('');
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return fixBrowserCompatibilityIssuesInCSS(stringifiedRules);
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} catch (error) {
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return null;
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}
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}
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function stringifyRule(rule: CSSRule, sheetHref: string | null): string {
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if (isCSSImportRule(rule)) {
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let importStringified;
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try {
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importStringified =
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// for same-origin stylesheets,
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// we can access the imported stylesheet rules directly
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stringifyStylesheet((rule as any).styleSheet) ||
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// work around browser issues with the raw string `@import url(...)` statement
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escapeImportStatement(rule as any);
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} catch (error) {
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importStringified = rule.cssText;
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}
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if ((rule as any).styleSheet.href) {
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// url()s within the imported stylesheet are relative to _that_ sheet's href
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return absolutifyURLs(importStringified, (rule as any).styleSheet.href);
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}
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return importStringified;
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} else {
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let ruleStringified = rule.cssText;
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if (isCSSStyleRule(rule) && (rule as any).selectorText.includes(':')) {
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// Safari does not escape selectors with : properly
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ruleStringified = fixSafariColons(ruleStringified);
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}
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if (sheetHref) {
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return absolutifyURLs(ruleStringified, sheetHref);
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}
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return ruleStringified;
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}
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}
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function fixBrowserCompatibilityIssuesInCSS(cssText: string): string {
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// Fix for Chrome's handling of webkit-background-clip
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if (
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cssText.includes(' background-clip: text;') &&
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!cssText.includes(' -webkit-background-clip: text;')
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) {
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cssText = cssText.replace(
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/\sbackground-clip:\s*text;/g,
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' -webkit-background-clip: text; background-clip: text;',
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);
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}
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return cssText;
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}
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function escapeImportStatement(rule: any): string {
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const { cssText } = rule;
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if (cssText.split('"').length < 3) return cssText;
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const statement = ['@import', `url(${JSON.stringify(rule.href)})`];
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if (rule.layerName === '') {
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statement.push(`layer`);
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} else if (rule.layerName) {
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statement.push(`layer(${rule.layerName})`);
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}
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if (rule.supportsText) {
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statement.push(`supports(${rule.supportsText})`);
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}
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if (rule.media.length) {
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statement.push(rule.media.mediaText);
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}
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return statement.join(' ') + ';';
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}
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function fixSafariColons(cssStringified: string): string {
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const regex = /(\[(?:[\w-]+)[^\\])(:(?:[\w-]+)\])/gm;
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return cssStringified.replace(regex, '$1\\$2');
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}
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function isCSSImportRule(rule: CSSRule): boolean {
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return 'styleSheet' in rule;
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}
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function isCSSStyleRule(rule: CSSRule): boolean {
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return 'selectorText' in rule;
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}
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function absolutifyURLs(cssText: string | null, href: string): string {
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if (!cssText) return '';
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const URL_IN_CSS_REF = /url\((?:(')([^']*)'|(")(.*?)"|([^)]*))\)/gm;
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const URL_PROTOCOL_MATCH = /^(?:[a-z+]+:)?\/\//i;
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const URL_WWW_MATCH = /^www\..*/i;
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const DATA_URI = /^(data:)([^,]*),(.*)/i;
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return cssText.replace(
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URL_IN_CSS_REF,
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(
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origin: string,
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quote1: string,
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path1: string,
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quote2: string,
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path2: string,
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path3: string,
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) => {
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const filePath = path1 || path2 || path3;
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const maybeQuote = quote1 || quote2 || '';
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if (!filePath) {
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return origin;
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}
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if (URL_PROTOCOL_MATCH.test(filePath) || URL_WWW_MATCH.test(filePath)) {
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return `url(${maybeQuote}${filePath}${maybeQuote})`;
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}
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if (DATA_URI.test(filePath)) {
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return `url(${maybeQuote}${filePath}${maybeQuote})`;
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}
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if (filePath[0] === '/') {
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return `url(${maybeQuote}${
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extractOrigin(href) + filePath
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}${maybeQuote})`;
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}
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const stack = href.split('/');
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const parts = filePath.split('/');
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stack.pop();
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for (const part of parts) {
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if (part === '.') {
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continue;
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} else if (part === '..') {
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stack.pop();
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} else {
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stack.push(part);
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}
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}
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return `url(${maybeQuote}${stack.join('/')}${maybeQuote})`;
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},
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);
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}
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function extractOrigin(url: string): string {
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let origin = '';
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if (url.indexOf('//') > -1) {
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origin = url.split('/').slice(0, 3).join('/');
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} else {
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origin = url.split('/')[0];
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}
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origin = origin.split('?')[0];
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return origin;
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}
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}
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@ -478,7 +478,8 @@ export default abstract class Observer {
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if (isRootNode(node)) {
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return true
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}
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const parent = node.parentNode
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// @ts-ignore SALESFORCE
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const parent = node.assignedSlot ? node.assignedSlot : node.parentNode
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let parentID: number | undefined
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// Disable parent check for the upper context HTMLHtmlElement, because it is root there... (before)
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