ngx-dynamic-hooks
Version:
Automatically insert live Angular components into a dynamic string of content (based on their selector or any pattern of your choice) and render the result in the DOM.
163 lines • 26.2 kB
JavaScript
import { Injectable } from '@angular/core';
import { anchorAttrHookId, anchorAttrParseToken } from '../../constants/core';
import { matchAll } from './utils';
import * as i0 from "@angular/core";
import * as i1 from "../platform/autoPlatformService";
const sanitizerPlaceholderTag = 'dynamic-hooks-sanitization-placeholder';
const sanitizerPlaceholderRegex = new RegExp(`<\/?${sanitizerPlaceholderTag}.*?>`, 'g');
/**
* A utility service that sanitizes an Element and all of its children while exluding found hook elements
*/
export class ContentSanitizer {
constructor(platformService) {
this.platformService = platformService;
this.attrWhitelist = [anchorAttrHookId, anchorAttrParseToken, 'class', 'href', 'src'];
}
/**
* Sanitizes an element while preserving marked hook anchors
*
* @param contentElement - The element to sanitize
* @param hookIndex - The current hookIndex
* @param token - The current ParseToken
*/
sanitize(contentElement, hookIndex, token) {
const originalHookAnchors = {};
// Replace all hook anchors with custom placeholder elements
// This is so the browser has no predefined rules where they can and can't exist in the dom hierarchy and doesn't edit the html.
for (const hook of Object.values(hookIndex)) {
const anchorElement = this.platformService.querySelectorAll(contentElement, `[${anchorAttrHookId}="${hook.id}"][${anchorAttrParseToken}="${token}"]`)?.[0];
if (anchorElement) {
originalHookAnchors[hook.id] = anchorElement;
const parentElement = this.platformService.getParentNode(anchorElement);
const childNodes = this.platformService.getChildNodes(anchorElement);
const placeholderElement = this.platformService.createElement(sanitizerPlaceholderTag);
this.platformService.setAttribute(placeholderElement, anchorAttrHookId, hook.id.toString());
this.platformService.setAttribute(placeholderElement, anchorAttrParseToken, token);
this.platformService.insertBefore(parentElement, placeholderElement, anchorElement);
this.platformService.removeChild(parentElement, anchorElement);
for (const node of childNodes) {
this.platformService.appendChild(placeholderElement, node);
}
}
}
// Encode sanitization placeholders (so they survive sanitization)
let innerHTML = this.platformService.getInnerContent(contentElement);
innerHTML = this.findAndEncodeTags(innerHTML, sanitizerPlaceholderRegex);
// Sanitize (without warnings)
const consoleWarnFn = console.warn;
console.warn = () => { };
let sanitizedInnerHtml = this.platformService.sanitize(innerHTML);
console.warn = consoleWarnFn;
// Decode sanitization placeholders
sanitizedInnerHtml = this.decodeTagString(sanitizedInnerHtml);
contentElement.innerHTML = sanitizedInnerHtml || '';
// Restore original hook anchors
for (const [hookId, anchorElement] of Object.entries(originalHookAnchors)) {
const placeholderElement = this.platformService.querySelectorAll(contentElement, `${sanitizerPlaceholderTag}[${anchorAttrHookId}="${hookId}"]`)?.[0];
if (placeholderElement) {
const parentElement = this.platformService.getParentNode(placeholderElement);
const childNodes = this.platformService.getChildNodes(placeholderElement);
this.platformService.insertBefore(parentElement, anchorElement, placeholderElement);
this.platformService.removeChild(parentElement, placeholderElement);
for (const node of childNodes) {
this.platformService.appendChild(anchorElement, node);
}
// As a last step, sanitize the hook anchor attrs as well
this.sanitizeElementAttrs(anchorElement);
}
}
return contentElement;
}
/**
* Sanitizes a single element's attributes
*
* @param element - The element in question
*/
sanitizeElementAttrs(element) {
// Collect all existing attributes, put them on span-element, sanitize it, then copy surviving attrs back onto hook anchor element
const attrs = this.platformService.getAttributeNames(element);
const tmpWrapperElement = this.platformService.createElement('div');
const tmpElement = this.platformService.createElement('span');
this.platformService.appendChild(tmpWrapperElement, tmpElement);
// Move attr to tmp
for (const attr of attrs) {
try {
this.platformService.setAttribute(tmpElement, attr, this.platformService.getAttribute(element, attr));
}
catch (e) { }
// Keep in separate try-catch, so the first doesn't stop the second
try {
// Always keep those two
if (attr !== anchorAttrHookId && attr !== anchorAttrParseToken) {
this.platformService.removeAttribute(element, attr);
}
}
catch (e) { }
}
// Sanitize tmp
tmpWrapperElement.innerHTML = this.platformService.sanitize(this.platformService.getInnerContent(tmpWrapperElement));
// Move surviving attrs back to element
const sanitizedTmpElement = this.platformService.querySelectorAll(tmpWrapperElement, 'span')[0];
const survivingAttrs = this.platformService.getAttributeNames(sanitizedTmpElement);
for (const survivingAttr of survivingAttrs) {
try {
this.platformService.setAttribute(element, survivingAttr, this.platformService.getAttribute(sanitizedTmpElement, survivingAttr));
}
catch (e) { }
}
return element;
}
// En/decoding placeholders
// ------------------------
/**
* Finds and encodes all tags that match the specified regex so that they survive sanitization
*
* @param content - The stringified html content to search
* @param substrRegex - The regex that matches the element tags
*/
findAndEncodeTags(content, substrRegex) {
let encodedContent = content;
const matches = matchAll(content, substrRegex);
matches.sort((a, b) => b.index - a.index);
for (const match of matches) {
const startIndex = match.index;
const endIndex = match.index + match[0].length;
const textBeforeSelector = encodedContent.substring(0, startIndex);
const encodedPlaceholder = this.encodeTagString(encodedContent.substring(startIndex, endIndex));
const textAfterSelector = encodedContent.substring(endIndex);
encodedContent = textBeforeSelector + encodedPlaceholder + textAfterSelector;
}
return encodedContent;
}
/**
* Encodes the special html chars in a html tag so that is is considered a harmless string
*
* @param element - The element as a string
*/
encodeTagString(element) {
element = element.replace(/</g, '@@@hook-lt@@@');
element = element.replace(/>/g, '@@@hook-gt@@@');
element = element.replace(/"/g, '@@@hook-dq@@@');
return element;
}
/**
* Decodes the encoded html chars in a html tag again
*
* @param element - The element as a string
*/
decodeTagString(element) {
element = element.replace(/@@@hook-lt@@@/g, '<');
element = element.replace(/@@@hook-gt@@@/g, '>');
element = element.replace(/@@@hook-dq@@@/g, '"');
return element;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: ContentSanitizer, deps: [{ token: i1.AutoPlatformService }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: ContentSanitizer, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: ContentSanitizer, decorators: [{
type: Injectable,
args: [{
providedIn: 'root'
}]
}], ctorParameters: () => [{ type: i1.AutoPlatformService }] });
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{ Injectable } from '@angular/core';\nimport { HookIndex } from '../../interfacesPublic';\nimport { AutoPlatformService } from '../platform/autoPlatformService';\nimport { anchorAttrHookId, anchorAttrParseToken } from '../../constants/core';\nimport { matchAll } from './utils';\n\nconst sanitizerPlaceholderTag = 'dynamic-hooks-sanitization-placeholder';\nconst sanitizerPlaceholderRegex = new RegExp(`<\\/?${sanitizerPlaceholderTag}.*?>`, 'g');\n\n/**\n * A utility service that sanitizes an Element and all of its children while exluding found hook elements\n */\n@Injectable({\n  providedIn: 'root'\n})\nexport class ContentSanitizer {\n  \n  attrWhitelist = [anchorAttrHookId, anchorAttrParseToken, 'class', 'href', 'src']\n\n  constructor(private platformService: AutoPlatformService) {}\n\n  /**\n   * Sanitizes an element while preserving marked hook anchors\n   * \n   * @param contentElement - The element to sanitize\n   * @param hookIndex - The current hookIndex\n   * @param token - The current ParseToken\n   */\n  sanitize(contentElement: any, hookIndex: HookIndex, token: string): any {\n    const originalHookAnchors: {[key: string]: any} = {};\n\n    // Replace all hook anchors with custom placeholder elements\n    // This is so the browser has no predefined rules where they can and can't exist in the dom hierarchy and doesn't edit the html.\n    for (const hook of Object.values(hookIndex)) {\n      const anchorElement = this.platformService.querySelectorAll(contentElement, `[${anchorAttrHookId}=\"${hook.id}\"][${anchorAttrParseToken}=\"${token}\"]`)?.[0];\n      if (anchorElement) {\n        originalHookAnchors[hook.id] = anchorElement;\n\n        const parentElement = this.platformService.getParentNode(anchorElement);\n        const childNodes = this.platformService.getChildNodes(anchorElement);\n\n        const placeholderElement = this.platformService.createElement(sanitizerPlaceholderTag);\n        this.platformService.setAttribute(placeholderElement, anchorAttrHookId, hook.id.toString());\n        this.platformService.setAttribute(placeholderElement, anchorAttrParseToken, token);\n        this.platformService.insertBefore(parentElement, placeholderElement, anchorElement);\n        this.platformService.removeChild(parentElement, anchorElement);\n        for (const node of childNodes) {\n          this.platformService.appendChild(placeholderElement, node);\n        }\n      }\n    }\n\n    // Encode sanitization placeholders (so they survive sanitization)\n    let innerHTML = this.platformService.getInnerContent(contentElement);\n    innerHTML = this.findAndEncodeTags(innerHTML, sanitizerPlaceholderRegex);\n\n    // Sanitize (without warnings)\n    const consoleWarnFn = console.warn;\n    console.warn = () => {};\n    let sanitizedInnerHtml = this.platformService.sanitize(innerHTML);\n    console.warn = consoleWarnFn;\n\n    // Decode sanitization placeholders\n    sanitizedInnerHtml = this.decodeTagString(sanitizedInnerHtml);\n    contentElement.innerHTML = sanitizedInnerHtml || '';\n\n    // Restore original hook anchors\n    for (const [hookId, anchorElement] of Object.entries(originalHookAnchors)) {\n      const placeholderElement = this.platformService.querySelectorAll(contentElement, `${sanitizerPlaceholderTag}[${anchorAttrHookId}=\"${hookId}\"]`)?.[0];\n      if (placeholderElement) {\n        const parentElement = this.platformService.getParentNode(placeholderElement);\n        const childNodes = this.platformService.getChildNodes(placeholderElement);\n        this.platformService.insertBefore(parentElement, anchorElement, placeholderElement);\n        this.platformService.removeChild(parentElement, placeholderElement);\n        for (const node of childNodes) {\n          this.platformService.appendChild(anchorElement, node);\n        }\n\n        // As a last step, sanitize the hook anchor attrs as well\n        this.sanitizeElementAttrs(anchorElement);\n      }\n    }\n\n    return contentElement;\n  }\n\n  /**\n   * Sanitizes a single element's attributes\n   *\n   * @param element - The element in question\n   */\n  private sanitizeElementAttrs(element: any): any {\n      // Collect all existing attributes, put them on span-element, sanitize it, then copy surviving attrs back onto hook anchor element\n      const attrs = this.platformService.getAttributeNames(element);\n      const tmpWrapperElement = this.platformService.createElement('div');\n      const tmpElement = this.platformService.createElement('span');\n      this.platformService.appendChild(tmpWrapperElement, tmpElement);\n      \n      // Move attr to tmp\n      for (const attr of attrs) {\n        try {\n          this.platformService.setAttribute(tmpElement, attr, this.platformService.getAttribute(element, attr)!);\n        } catch (e) {}\n        // Keep in separate try-catch, so the first doesn't stop the second\n        try {\n          // Always keep those two\n          if (attr !== anchorAttrHookId && attr !== anchorAttrParseToken) {\n            this.platformService.removeAttribute(element, attr);\n          }\n        } catch (e) {}          \n      }\n\n      // Sanitize tmp\n      tmpWrapperElement.innerHTML = this.platformService.sanitize(this.platformService.getInnerContent(tmpWrapperElement));\n\n      // Move surviving attrs back to element\n      const sanitizedTmpElement = this.platformService.querySelectorAll(tmpWrapperElement, 'span')[0];\n      const survivingAttrs = this.platformService.getAttributeNames(sanitizedTmpElement);\n      for (const survivingAttr of survivingAttrs) {\n        try {\n          this.platformService.setAttribute(element, survivingAttr, this.platformService.getAttribute(sanitizedTmpElement, survivingAttr)!);\n        } catch (e) {}\n      }\n\n      return element;\n  }\n\n  // En/decoding placeholders\n  // ------------------------\n\n  /**\n   * Finds and encodes all tags that match the specified regex so that they survive sanitization\n   * \n   * @param content - The stringified html content to search\n   * @param substrRegex - The regex that matches the element tags\n   */\n  private findAndEncodeTags(content: string, substrRegex: RegExp): string {\n    let encodedContent = content;\n\n    const matches = matchAll(content, substrRegex);\n    matches.sort((a, b) => b.index - a.index);\n\n    for (const match of matches) {\n      const startIndex = match.index;\n      const endIndex = match.index + match[0].length;\n\n      const textBeforeSelector = encodedContent.substring(0, startIndex);\n      const encodedPlaceholder = this.encodeTagString(encodedContent.substring(startIndex, endIndex));\n      const textAfterSelector = encodedContent.substring(endIndex);\n      encodedContent = textBeforeSelector + encodedPlaceholder + textAfterSelector;\n    }\n\n    return encodedContent;\n  }\n\n  /**\n   * Encodes the special html chars in a html tag so that is is considered a harmless string\n   *\n   * @param element - The element as a string\n   */\n  private encodeTagString(element: string): string {\n    element = element.replace(/</g, '@@@hook-lt@@@');\n    element = element.replace(/>/g, '@@@hook-gt@@@');\n    element = element.replace(/\"/g, '@@@hook-dq@@@');\n    return element;\n  }\n\n  /**\n   * Decodes the encoded html chars in a html tag again\n   *\n   * @param element - The element as a string\n   */\n  private decodeTagString(element: string): string {\n    element = element.replace(/@@@hook-lt@@@/g, '<');\n    element = element.replace(/@@@hook-gt@@@/g, '>');\n    element = element.replace(/@@@hook-dq@@@/g, '\"');\n    return element;\n  }\n\n}\n"]}