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icon-registry.ts
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {DOCUMENT} from '@angular/common';
import {HttpClient, HttpErrorResponse} from '@angular/common/http';
import {
ErrorHandler,
Inject,
Injectable,
InjectionToken,
Optional,
SecurityContext,
SkipSelf,
OnDestroy,
} from '@angular/core';
import {DomSanitizer, SafeResourceUrl, SafeHtml} from '@angular/platform-browser';
import {forkJoin, Observable, of as observableOf, throwError as observableThrow} from 'rxjs';
import {catchError, finalize, map, share, tap} from 'rxjs/operators';
/**
* Returns an exception to be thrown in the case when attempting to
* load an icon with a name that cannot be found.
* @docs-private
*/
export function getMatIconNameNotFoundError(iconName: string): Error {
return Error(`Unable to find icon with the name "${iconName}"`);
}
/**
* Returns an exception to be thrown when the consumer attempts to use
* `<mat-icon>` without including @angular/common/http.
* @docs-private
*/
export function getMatIconNoHttpProviderError(): Error {
return Error('Could not find HttpClient provider for use with Angular Material icons. ' +
'Please include the HttpClientModule from @angular/common/http in your ' +
'app imports.');
}
/**
* Returns an exception to be thrown when a URL couldn't be sanitized.
* @param url URL that was attempted to be sanitized.
* @docs-private
*/
export function getMatIconFailedToSanitizeUrlError(url: SafeResourceUrl): Error {
return Error(`The URL provided to MatIconRegistry was not trusted as a resource URL ` +
`via Angular's DomSanitizer. Attempted URL was "${url}".`);
}
/**
* Returns an exception to be thrown when a HTML string couldn't be sanitized.
* @param literal HTML that was attempted to be sanitized.
* @docs-private
*/
export function getMatIconFailedToSanitizeLiteralError(literal: SafeHtml): Error {
return Error(`The literal provided to MatIconRegistry was not trusted as safe HTML by ` +
`Angular's DomSanitizer. Attempted literal was "${literal}".`);
}
/** Options that can be used to configure how an icon or the icons in an icon set are presented. */
export interface IconOptions {
/** View box to set on the icon. */
viewBox?: string;
}
/**
* Configuration for an icon, including the URL and possibly the cached SVG element.
* @docs-private
*/
class SvgIconConfig {
url: SafeResourceUrl | null;
svgElement: SVGElement | null;
constructor(url: SafeResourceUrl, options?: IconOptions);
constructor(svgElement: SVGElement, options?: IconOptions);
constructor(data: SafeResourceUrl | SVGElement, public options?: IconOptions) {
// Note that we can't use `instanceof SVGElement` here,
// because it'll break during server-side rendering.
if (!!(data as any).nodeName) {
this.svgElement = data as SVGElement;
} else {
this.url = data as SafeResourceUrl;
}
}
}
/**
* Service to register and display icons used by the `<mat-icon>` component.
* - Registers icon URLs by namespace and name.
* - Registers icon set URLs by namespace.
* - Registers aliases for CSS classes, for use with icon fonts.
* - Loads icons from URLs and extracts individual icons from icon sets.
*/
@Injectable({providedIn: 'root'})
export class MatIconRegistry implements OnDestroy {
private _document: Document;
/**
* URLs and cached SVG elements for individual icons. Keys are of the format "[namespace]:[icon]".
*/
private _svgIconConfigs = new Map<string, SvgIconConfig>();
/**
* SvgIconConfig objects and cached SVG elements for icon sets, keyed by namespace.
* Multiple icon sets can be registered under the same namespace.
*/
private _iconSetConfigs = new Map<string, SvgIconConfig[]>();
/** Cache for icons loaded by direct URLs. */
private _cachedIconsByUrl = new Map<string, SVGElement>();
/** In-progress icon fetches. Used to coalesce multiple requests to the same URL. */
private _inProgressUrlFetches = new Map<string, Observable<string>>();
/** Map from font identifiers to their CSS class names. Used for icon fonts. */
private _fontCssClassesByAlias = new Map<string, string>();
/**
* The CSS class to apply when an `<mat-icon>` component has no icon name, url, or font specified.
* The default 'material-icons' value assumes that the material icon font has been loaded as
* described at http://google.github.io/material-design-icons/#icon-font-for-the-web
*/
private _defaultFontSetClass = 'material-icons';
constructor(
@Optional() private _httpClient: HttpClient,
private _sanitizer: DomSanitizer,
@Optional() @Inject(DOCUMENT) document: any,
// @breaking-change 9.0.0 _errorHandler parameter to be made required
@Optional() private readonly _errorHandler?: ErrorHandler) {
this._document = document;
}
/**
* Registers an icon by URL in the default namespace.
* @param iconName Name under which the icon should be registered.
* @param url
*/
addSvgIcon(iconName: string, url: SafeResourceUrl, options?: IconOptions): this {
return this.addSvgIconInNamespace('', iconName, url, options);
}
/**
* Registers an icon using an HTML string in the default namespace.
* @param iconName Name under which the icon should be registered.
* @param literal SVG source of the icon.
*/
addSvgIconLiteral(iconName: string, literal: SafeHtml, options?: IconOptions): this {
return this.addSvgIconLiteralInNamespace('', iconName, literal, options);
}
/**
* Registers an icon by URL in the specified namespace.
* @param namespace Namespace in which the icon should be registered.
* @param iconName Name under which the icon should be registered.
* @param url
*/
addSvgIconInNamespace(namespace: string, iconName: string, url: SafeResourceUrl,
options?: IconOptions): this {
return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(url, options));
}
/**
* Registers an icon using an HTML string in the specified namespace.
* @param namespace Namespace in which the icon should be registered.
* @param iconName Name under which the icon should be registered.
* @param literal SVG source of the icon.
*/
addSvgIconLiteralInNamespace(namespace: string, iconName: string, literal: SafeHtml,
options?: IconOptions): this {
const sanitizedLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);
if (!sanitizedLiteral) {
throw getMatIconFailedToSanitizeLiteralError(literal);
}
const svgElement = this._createSvgElementForSingleIcon(sanitizedLiteral, options);
return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(svgElement, options));
}
/**
* Registers an icon set by URL in the default namespace.
* @param url
*/
addSvgIconSet(url: SafeResourceUrl, options?: IconOptions): this {
return this.addSvgIconSetInNamespace('', url, options);
}
/**
* Registers an icon set using an HTML string in the default namespace.
* @param literal SVG source of the icon set.
*/
addSvgIconSetLiteral(literal: SafeHtml, options?: IconOptions): this {
return this.addSvgIconSetLiteralInNamespace('', literal, options);
}
/**
* Registers an icon set by URL in the specified namespace.
* @param namespace Namespace in which to register the icon set.
* @param url
*/
addSvgIconSetInNamespace(namespace: string, url: SafeResourceUrl, options?: IconOptions): this {
return this._addSvgIconSetConfig(namespace, new SvgIconConfig(url, options));
}
/**
* Registers an icon set using an HTML string in the specified namespace.
* @param namespace Namespace in which to register the icon set.
* @param literal SVG source of the icon set.
*/
addSvgIconSetLiteralInNamespace(namespace: string, literal: SafeHtml,
options?: IconOptions): this {
const sanitizedLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);
if (!sanitizedLiteral) {
throw getMatIconFailedToSanitizeLiteralError(literal);
}
const svgElement = this._svgElementFromString(sanitizedLiteral);
return this._addSvgIconSetConfig(namespace, new SvgIconConfig(svgElement, options));
}
/**
* Defines an alias for a CSS class name to be used for icon fonts. Creating an matIcon
* component with the alias as the fontSet input will cause the class name to be applied
* to the `<mat-icon>` element.
*
* @param alias Alias for the font.
* @param className Class name override to be used instead of the alias.
*/
registerFontClassAlias(alias: string, className: string = alias): this {
this._fontCssClassesByAlias.set(alias, className);
return this;
}
/**
* Returns the CSS class name associated with the alias by a previous call to
* registerFontClassAlias. If no CSS class has been associated, returns the alias unmodified.
*/
classNameForFontAlias(alias: string): string {
return this._fontCssClassesByAlias.get(alias) || alias;
}
/**
* Sets the CSS class name to be used for icon fonts when an `<mat-icon>` component does not
* have a fontSet input value, and is not loading an icon by name or URL.
*
* @param className
*/
setDefaultFontSetClass(className: string): this {
this._defaultFontSetClass = className;
return this;
}
/**
* Returns the CSS class name to be used for icon fonts when an `<mat-icon>` component does not
* have a fontSet input value, and is not loading an icon by name or URL.
*/
getDefaultFontSetClass(): string {
return this._defaultFontSetClass;
}
/**
* Returns an Observable that produces the icon (as an `<svg>` DOM element) from the given URL.
* The response from the URL may be cached so this will not always cause an HTTP request, but
* the produced element will always be a new copy of the originally fetched icon. (That is,
* it will not contain any modifications made to elements previously returned).
*
* @param safeUrl URL from which to fetch the SVG icon.
*/
getSvgIconFromUrl(safeUrl: SafeResourceUrl): Observable<SVGElement> {
const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl);
if (!url) {
throw getMatIconFailedToSanitizeUrlError(safeUrl);
}
const cachedIcon = this._cachedIconsByUrl.get(url);
if (cachedIcon) {
return observableOf(cloneSvg(cachedIcon));
}
return this._loadSvgIconFromConfig(new SvgIconConfig(safeUrl)).pipe(
tap(svg => this._cachedIconsByUrl.set(url!, svg)),
map(svg => cloneSvg(svg)),
);
}
/**
* Returns an Observable that produces the icon (as an `<svg>` DOM element) with the given name
* and namespace. The icon must have been previously registered with addIcon or addIconSet;
* if not, the Observable will throw an error.
*
* @param name Name of the icon to be retrieved.
* @param namespace Namespace in which to look for the icon.
*/
getNamedSvgIcon(name: string, namespace: string = ''): Observable<SVGElement> {
// Return (copy of) cached icon if possible.
const key = iconKey(namespace, name);
const config = this._svgIconConfigs.get(key);
if (config) {
return this._getSvgFromConfig(config);
}
// See if we have any icon sets registered for the namespace.
const iconSetConfigs = this._iconSetConfigs.get(namespace);
if (iconSetConfigs) {
return this._getSvgFromIconSetConfigs(name, iconSetConfigs);
}
return observableThrow(getMatIconNameNotFoundError(key));
}
ngOnDestroy() {
this._svgIconConfigs.clear();
this._iconSetConfigs.clear();
this._cachedIconsByUrl.clear();
}
/**
* Returns the cached icon for a SvgIconConfig if available, or fetches it from its URL if not.
*/
private _getSvgFromConfig(config: SvgIconConfig): Observable<SVGElement> {
if (config.svgElement) {
// We already have the SVG element for this icon, return a copy.
return observableOf(cloneSvg(config.svgElement));
} else {
// Fetch the icon from the config's URL, cache it, and return a copy.
return this._loadSvgIconFromConfig(config).pipe(
tap(svg => config.svgElement = svg),
map(svg => cloneSvg(svg)),
);
}
}
/**
* Attempts to find an icon with the specified name in any of the SVG icon sets.
* First searches the available cached icons for a nested element with a matching name, and
* if found copies the element to a new `<svg>` element. If not found, fetches all icon sets
* that have not been cached, and searches again after all fetches are completed.
* The returned Observable produces the SVG element if possible, and throws
* an error if no icon with the specified name can be found.
*/
private _getSvgFromIconSetConfigs(name: string, iconSetConfigs: SvgIconConfig[]):
Observable<SVGElement> {
// For all the icon set SVG elements we've fetched, see if any contain an icon with the
// requested name.
const namedIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs);
if (namedIcon) {
// We could cache namedIcon in _svgIconConfigs, but since we have to make a copy every
// time anyway, there's probably not much advantage compared to just always extracting
// it from the icon set.
return observableOf(namedIcon);
}
// Not found in any cached icon sets. If there are icon sets with URLs that we haven't
// fetched, fetch them now and look for iconName in the results.
const iconSetFetchRequests: Observable<SVGElement | null>[] = iconSetConfigs
.filter(iconSetConfig => !iconSetConfig.svgElement)
.map(iconSetConfig => {
return this._loadSvgIconSetFromConfig(iconSetConfig).pipe(
catchError((err: HttpErrorResponse): Observable<SVGElement | null> => {
const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, iconSetConfig.url);
// Swallow errors fetching individual URLs so the
// combined Observable won't necessarily fail.
const errorMessage = `Loading icon set URL: ${url} failed: ${err.message}`;
// @breaking-change 9.0.0 _errorHandler parameter to be made required
if (this._errorHandler) {
this._errorHandler.handleError(new Error(errorMessage));
} else {
console.error(errorMessage);
}
return observableOf(null);
})
);
});
// Fetch all the icon set URLs. When the requests complete, every IconSet should have a
// cached SVG element (unless the request failed), and we can check again for the icon.
return forkJoin(iconSetFetchRequests).pipe(map(() => {
const foundIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs);
if (!foundIcon) {
throw getMatIconNameNotFoundError(name);
}
return foundIcon;
}));
}
/**
* Searches the cached SVG elements for the given icon sets for a nested icon element whose "id"
* tag matches the specified name. If found, copies the nested element to a new SVG element and
* returns it. Returns null if no matching element is found.
*/
private _extractIconWithNameFromAnySet(iconName: string, iconSetConfigs: SvgIconConfig[]):
SVGElement | null {
// Iterate backwards, so icon sets added later have precedence.
for (let i = iconSetConfigs.length - 1; i >= 0; i--) {
const config = iconSetConfigs[i];
if (config.svgElement) {
const foundIcon = this._extractSvgIconFromSet(config.svgElement, iconName, config.options);
if (foundIcon) {
return foundIcon;
}
}
}
return null;
}
/**
* Loads the content of the icon URL specified in the SvgIconConfig and creates an SVG element
* from it.
*/
private _loadSvgIconFromConfig(config: SvgIconConfig): Observable<SVGElement> {
return this._fetchUrl(config.url)
.pipe(map(svgText => this._createSvgElementForSingleIcon(svgText, config.options)));
}
/**
* Loads the content of the icon set URL specified in the SvgIconConfig and creates an SVG element
* from it.
*/
private _loadSvgIconSetFromConfig(config: SvgIconConfig): Observable<SVGElement> {
// If the SVG for this icon set has already been parsed, do nothing.
if (config.svgElement) {
return observableOf(config.svgElement);
}
return this._fetchUrl(config.url).pipe(map(svgText => {
// It is possible that the icon set was parsed and cached by an earlier request, so parsing
// only needs to occur if the cache is yet unset.
if (!config.svgElement) {
config.svgElement = this._svgElementFromString(svgText);
}
return config.svgElement;
}));
}
/**
* Creates a DOM element from the given SVG string, and adds default attributes.
*/
private _createSvgElementForSingleIcon(responseText: string, options?: IconOptions): SVGElement {
const svg = this._svgElementFromString(responseText);
this._setSvgAttributes(svg, options);
return svg;
}
/**
* Searches the cached element of the given SvgIconConfig for a nested icon element whose "id"
* tag matches the specified name. If found, copies the nested element to a new SVG element and
* returns it. Returns null if no matching element is found.
*/
private _extractSvgIconFromSet(iconSet: SVGElement, iconName: string,
options?: IconOptions): SVGElement | null {
// Use the `id="iconName"` syntax in order to escape special
// characters in the ID (versus using the #iconName syntax).
const iconSource = iconSet.querySelector(`[id="${iconName}"]`);
if (!iconSource) {
return null;
}
// Clone the element and remove the ID to prevent multiple elements from being added
// to the page with the same ID.
const iconElement = iconSource.cloneNode(true) as Element;
iconElement.removeAttribute('id');
// If the icon node is itself an <svg> node, clone and return it directly. If not, set it as
// the content of a new <svg> node.
if (iconElement.nodeName.toLowerCase() === 'svg') {
return this._setSvgAttributes(iconElement as SVGElement, options);
}
// If the node is a <symbol>, it won't be rendered so we have to convert it into <svg>. Note
// that the same could be achieved by referring to it via <use href="#id">, however the <use>
// tag is problematic on Firefox, because it needs to include the current page path.
if (iconElement.nodeName.toLowerCase() === 'symbol') {
return this._setSvgAttributes(this._toSvgElement(iconElement), options);
}
// createElement('SVG') doesn't work as expected; the DOM ends up with
// the correct nodes, but the SVG content doesn't render. Instead we
// have to create an empty SVG node using innerHTML and append its content.
// Elements created using DOMParser.parseFromString have the same problem.
// http://stackoverflow.com/questions/23003278/svg-innerhtml-in-firefox-can-not-display
const svg = this._svgElementFromString('<svg></svg>');
// Clone the node so we don't remove it from the parent icon set element.
svg.appendChild(iconElement);
return this._setSvgAttributes(svg, options);
}
/**
* Creates a DOM element from the given SVG string.
*/
private _svgElementFromString(str: string): SVGElement {
const div = this._document.createElement('DIV');
div.innerHTML = str;
const svg = div.querySelector('svg') as SVGElement;
if (!svg) {
throw Error('<svg> tag not found');
}
return svg;
}
/**
* Converts an element into an SVG node by cloning all of its children.
*/
private _toSvgElement(element: Element): SVGElement {
const svg = this._svgElementFromString('<svg></svg>');
const attributes = element.attributes;
// Copy over all the attributes from the `symbol` to the new SVG, except the id.
for (let i = 0; i < attributes.length; i++) {
const {name, value} = attributes[i];
if (name !== 'id') {
svg.setAttribute(name, value);
}
}
for (let i = 0; i < element.childNodes.length; i++) {
if (element.childNodes[i].nodeType === this._document.ELEMENT_NODE) {
svg.appendChild(element.childNodes[i].cloneNode(true));
}
}
return svg;
}
/**
* Sets the default attributes for an SVG element to be used as an icon.
*/
private _setSvgAttributes(svg: SVGElement, options?: IconOptions): SVGElement {
svg.setAttribute('fit', '');
svg.setAttribute('height', '100%');
svg.setAttribute('width', '100%');
svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
svg.setAttribute('focusable', 'false'); // Disable IE11 default behavior to make SVGs focusable.
if (options && options.viewBox) {
svg.setAttribute('viewBox', options.viewBox);
}
return svg;
}
/**
* Returns an Observable which produces the string contents of the given URL. Results may be
* cached, so future calls with the same URL may not cause another HTTP request.
*/
private _fetchUrl(safeUrl: SafeResourceUrl | null): Observable<string> {
if (!this._httpClient) {
throw getMatIconNoHttpProviderError();
}
if (safeUrl == null) {
throw Error(`Cannot fetch icon from URL "${safeUrl}".`);
}
const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl);
if (!url) {
throw getMatIconFailedToSanitizeUrlError(safeUrl);
}
// Store in-progress fetches to avoid sending a duplicate request for a URL when there is
// already a request in progress for that URL. It's necessary to call share() on the
// Observable returned by http.get() so that multiple subscribers don't cause multiple XHRs.
const inProgressFetch = this._inProgressUrlFetches.get(url);
if (inProgressFetch) {
return inProgressFetch;
}
// TODO(jelbourn): for some reason, the `finalize` operator "loses" the generic type on the
// Observable. Figure out why and fix it.
const req = this._httpClient.get(url, {responseType: 'text'}).pipe(
finalize(() => this._inProgressUrlFetches.delete(url)),
share(),
);
this._inProgressUrlFetches.set(url, req);
return req;
}
/**
* Registers an icon config by name in the specified namespace.
* @param namespace Namespace in which to register the icon config.
* @param iconName Name under which to register the config.
* @param config Config to be registered.
*/
private _addSvgIconConfig(namespace: string, iconName: string, config: SvgIconConfig): this {
this._svgIconConfigs.set(iconKey(namespace, iconName), config);
return this;
}
/**
* Registers an icon set config in the specified namespace.
* @param namespace Namespace in which to register the icon config.
* @param config Config to be registered.
*/
private _addSvgIconSetConfig(namespace: string, config: SvgIconConfig): this {
const configNamespace = this._iconSetConfigs.get(namespace);
if (configNamespace) {
configNamespace.push(config);
} else {
this._iconSetConfigs.set(namespace, [config]);
}
return this;
}
}
/** @docs-private */
export function ICON_REGISTRY_PROVIDER_FACTORY(
parentRegistry: MatIconRegistry,
httpClient: HttpClient,
sanitizer: DomSanitizer,
document?: any,
errorHandler?: ErrorHandler) {
return parentRegistry || new MatIconRegistry(httpClient, sanitizer, document, errorHandler);
}
/** @docs-private */
export const ICON_REGISTRY_PROVIDER = {
// If there is already an MatIconRegistry available, use that. Otherwise, provide a new one.
provide: MatIconRegistry,
deps: [
[new Optional(), new SkipSelf(), MatIconRegistry],
[new Optional(), HttpClient],
DomSanitizer,
[new Optional(), ErrorHandler],
[new Optional(), DOCUMENT as InjectionToken<any>],
],
useFactory: ICON_REGISTRY_PROVIDER_FACTORY,
};
/** Clones an SVGElement while preserving type information. */
function cloneSvg(svg: SVGElement): SVGElement {
return svg.cloneNode(true) as SVGElement;
}
/** Returns the cache key to use for an icon namespace and name. */
function iconKey(namespace: string, name: string) {
return namespace + ':' + name;
}