/** * @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 { first } from 'rxjs/operators'; import { APP_BOOTSTRAP_LISTENER, ApplicationRef } from '../application_ref'; import { ENABLED_SSR_FEATURES } from '../application_tokens'; import { Console } from '../console'; import { ENVIRONMENT_INITIALIZER, Injector, makeEnvironmentProviders } from '../di'; import { inject } from '../di/injector_compatibility'; import { formatRuntimeError, RuntimeError } from '../errors'; import { enableLocateOrCreateContainerRefImpl } from '../linker/view_container_ref'; import { enableLocateOrCreateElementNodeImpl } from '../render3/instructions/element'; import { enableLocateOrCreateElementContainerNodeImpl } from '../render3/instructions/element_container'; import { enableApplyRootElementTransformImpl } from '../render3/instructions/shared'; import { enableLocateOrCreateContainerAnchorImpl } from '../render3/instructions/template'; import { enableLocateOrCreateTextNodeImpl } from '../render3/instructions/text'; import { getDocument } from '../render3/interfaces/document'; import { isPlatformBrowser } from '../render3/util/misc_utils'; import { TransferState } from '../transfer_state'; import { NgZone } from '../zone'; import { cleanupDehydratedViews } from './cleanup'; import { IS_HYDRATION_DOM_REUSE_ENABLED, PRESERVE_HOST_CONTENT } from './tokens'; import { enableRetrieveHydrationInfoImpl, NGH_DATA_KEY, SSR_CONTENT_INTEGRITY_MARKER } from './utils'; import { enableFindMatchingDehydratedViewImpl } from './views'; /** * Indicates whether the hydration-related code was added, * prevents adding it multiple times. */ let isHydrationSupportEnabled = false; /** * Defines a period of time that Angular waits for the `ApplicationRef.isStable` to emit `true`. * If there was no event with the `true` value during this time, Angular reports a warning. */ const APPLICATION_IS_STABLE_TIMEOUT = 10000; /** * Brings the necessary hydration code in tree-shakable manner. * The code is only present when the `provideClientHydration` is * invoked. Otherwise, this code is tree-shaken away during the * build optimization step. * * This technique allows us to swap implementations of methods so * tree shaking works appropriately when hydration is disabled or * enabled. It brings in the appropriate version of the method that * supports hydration only when enabled. */ function enableHydrationRuntimeSupport() { if (!isHydrationSupportEnabled) { isHydrationSupportEnabled = true; enableRetrieveHydrationInfoImpl(); enableLocateOrCreateElementNodeImpl(); enableLocateOrCreateTextNodeImpl(); enableLocateOrCreateElementContainerNodeImpl(); enableLocateOrCreateContainerAnchorImpl(); enableLocateOrCreateContainerRefImpl(); enableFindMatchingDehydratedViewImpl(); enableApplyRootElementTransformImpl(); } } /** * Outputs a message with hydration stats into a console. */ function printHydrationStats(injector) { const console = injector.get(Console); const message = `Angular hydrated ${ngDevMode.hydratedComponents} component(s) ` + `and ${ngDevMode.hydratedNodes} node(s), ` + `${ngDevMode.componentsSkippedHydration} component(s) were skipped. ` + `Note: this feature is in Developer Preview mode. ` + `Learn more at https://angular.io/guide/hydration.`; // tslint:disable-next-line:no-console console.log(message); } /** * Returns a Promise that is resolved when an application becomes stable. */ function whenStable(appRef, injector) { const isStablePromise = appRef.isStable.pipe(first((isStable) => isStable)).toPromise(); if (typeof ngDevMode !== 'undefined' && ngDevMode) { const timeoutTime = APPLICATION_IS_STABLE_TIMEOUT; const console = injector.get(Console); const ngZone = injector.get(NgZone); // The following call should not and does not prevent the app to become stable // We cannot use RxJS timer here because the app would remain unstable. // This also avoids an extra change detection cycle. const timeoutId = ngZone.runOutsideAngular(() => { return setTimeout(() => logWarningOnStableTimedout(timeoutTime, console), timeoutTime); }); isStablePromise.finally(() => clearTimeout(timeoutId)); } return isStablePromise.then(() => { }); } /** * Returns a set of providers required to setup hydration support * for an application that is server side rendered. This function is * included into the `provideClientHydration` public API function from * the `platform-browser` package. * * The function sets up an internal flag that would be recognized during * the server side rendering time as well, so there is no need to * configure or change anything in NgUniversal to enable the feature. */ export function withDomHydration() { return makeEnvironmentProviders([ { provide: IS_HYDRATION_DOM_REUSE_ENABLED, useFactory: () => { let isEnabled = true; if (isPlatformBrowser()) { // On the client, verify that the server response contains // hydration annotations. Otherwise, keep hydration disabled. const transferState = inject(TransferState, { optional: true }); isEnabled = !!transferState?.get(NGH_DATA_KEY, null); if (!isEnabled && (typeof ngDevMode !== 'undefined' && ngDevMode)) { const console = inject(Console); const message = formatRuntimeError(-505 /* RuntimeErrorCode.MISSING_HYDRATION_ANNOTATIONS */, 'Angular hydration was requested on the client, but there was no ' + 'serialized information present in the server response, ' + 'thus hydration was not enabled. ' + 'Make sure the `provideClientHydration()` is included into the list ' + 'of providers in the server part of the application configuration.'); // tslint:disable-next-line:no-console console.warn(message); } } if (isEnabled) { inject(ENABLED_SSR_FEATURES).add('hydration'); } return isEnabled; }, }, { provide: ENVIRONMENT_INITIALIZER, useValue: () => { // Since this function is used across both server and client, // make sure that the runtime code is only added when invoked // on the client. Moving forward, the `isPlatformBrowser` check should // be replaced with a tree-shakable alternative (e.g. `isServer` // flag). if (isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED)) { verifySsrContentsIntegrity(); enableHydrationRuntimeSupport(); } }, multi: true, }, { provide: PRESERVE_HOST_CONTENT, useFactory: () => { // Preserve host element content only in a browser // environment and when hydration is configured properly. // On a server, an application is rendered from scratch, // so the host content needs to be empty. return isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED); } }, { provide: APP_BOOTSTRAP_LISTENER, useFactory: () => { if (isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED)) { const appRef = inject(ApplicationRef); const injector = inject(Injector); return () => { // Wait until an app becomes stable and cleanup all views that // were not claimed during the application bootstrap process. // The timing is similar to when we start the serialization process // on the server. // // Note: the cleanup task *MUST* be scheduled within the Angular zone // to ensure that change detection is properly run afterward. whenStable(appRef, injector).then(() => { NgZone.assertInAngularZone(); cleanupDehydratedViews(appRef); if (typeof ngDevMode !== 'undefined' && ngDevMode) { printHydrationStats(injector); } }); }; } return () => { }; // noop }, multi: true, } ]); } /** * * @param time The time in ms until the stable timedout warning message is logged */ function logWarningOnStableTimedout(time, console) { const message = `Angular hydration expected the ApplicationRef.isStable() to emit \`true\`, but it ` + `didn't happen within ${time}ms. Angular hydration logic depends on the application becoming stable ` + `as a signal to complete hydration process.`; console.warn(formatRuntimeError(-506 /* RuntimeErrorCode.HYDRATION_STABLE_TIMEDOUT */, message)); } /** * Verifies whether the DOM contains a special marker added during SSR time to make sure * there is no SSR'ed contents transformations happen after SSR is completed. Typically that * happens either by CDN or during the build process as an optimization to remove comment nodes. * Hydration process requires comment nodes produced by Angular to locate correct DOM segments. * When this special marker is *not* present - throw an error and do not proceed with hydration, * since it will not be able to function correctly. * * Note: this function is invoked only on the client, so it's safe to use DOM APIs. */ function verifySsrContentsIntegrity() { const doc = getDocument(); let hydrationMarker; for (const node of doc.body.childNodes) { if (node.nodeType === Node.COMMENT_NODE && node.textContent?.trim() === SSR_CONTENT_INTEGRITY_MARKER) { hydrationMarker = node; break; } } if (!hydrationMarker) { throw new RuntimeError(-507 /* RuntimeErrorCode.MISSING_SSR_CONTENT_INTEGRITY_MARKER */, typeof ngDevMode !== 'undefined' && ngDevMode && 'Angular hydration logic detected that HTML content of this page was modified after it ' + 'was produced during server side rendering. Make sure that there are no optimizations ' + 'that remove comment nodes from HTML enabled on your CDN. Angular hydration ' + 'relies on HTML produced by the server, including whitespaces and comment nodes.'); } } //# 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Otherwise, keep hydration disabled.\n          const transferState = inject(TransferState, {optional: true});\n          isEnabled = !!transferState?.get(NGH_DATA_KEY, null);\n          if (!isEnabled && (typeof ngDevMode !== 'undefined' && ngDevMode)) {\n            const console = inject(Console);\n            const message = formatRuntimeError(\n                RuntimeErrorCode.MISSING_HYDRATION_ANNOTATIONS,\n                'Angular hydration was requested on the client, but there was no ' +\n                    'serialized information present in the server response, ' +\n                    'thus hydration was not enabled. ' +\n                    'Make sure the `provideClientHydration()` is included into the list ' +\n                    'of providers in the server part of the application configuration.');\n            // tslint:disable-next-line:no-console\n            console.warn(message);\n          }\n        }\n        if (isEnabled) {\n          inject(ENABLED_SSR_FEATURES).add('hydration');\n        }\n        return isEnabled;\n      },\n    },\n    {\n      provide: ENVIRONMENT_INITIALIZER,\n      useValue: () => {\n        // Since this function is used across both server and client,\n        // make sure that the runtime code is only added when invoked\n        // on the client. Moving forward, the `isPlatformBrowser` check should\n        // be replaced with a tree-shakable alternative (e.g. `isServer`\n        // flag).\n        if (isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED)) {\n          verifySsrContentsIntegrity();\n          enableHydrationRuntimeSupport();\n        }\n      },\n      multi: true,\n    },\n    {\n      provide: PRESERVE_HOST_CONTENT,\n      useFactory: () => {\n        // Preserve host element content only in a browser\n        // environment and when hydration is configured properly.\n        // On a server, an application is rendered from scratch,\n        // so the host content needs to be empty.\n        return isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED);\n      }\n    },\n    {\n      provide: APP_BOOTSTRAP_LISTENER,\n      useFactory: () => {\n        if (isPlatformBrowser() && inject(IS_HYDRATION_DOM_REUSE_ENABLED)) {\n          const appRef = inject(ApplicationRef);\n          const injector = inject(Injector);\n          return () => {\n            // Wait until an app becomes stable and cleanup all views that\n            // were not claimed during the application bootstrap process.\n            // The timing is similar to when we start the serialization process\n            // on the server.\n            //\n            // Note: the cleanup task *MUST* be scheduled within the Angular zone\n            // to ensure that change detection is properly run afterward.\n            whenStable(appRef, injector).then(() => {\n              NgZone.assertInAngularZone();\n              cleanupDehydratedViews(appRef);\n\n              if (typeof ngDevMode !== 'undefined' && ngDevMode) {\n                printHydrationStats(injector);\n              }\n            });\n          };\n        }\n        return () => {};  // noop\n      },\n      multi: true,\n    }\n  ]);\n}\n\n/**\n *\n * @param time The time in ms until the stable timedout warning message is logged\n */\nfunction logWarningOnStableTimedout(time: number, console: Console): void {\n  const message =\n      `Angular hydration expected the ApplicationRef.isStable() to emit \\`true\\`, but it ` +\n      `didn't happen within ${\n          time}ms. Angular hydration logic depends on the application becoming stable ` +\n      `as a signal to complete hydration process.`;\n\n  console.warn(formatRuntimeError(RuntimeErrorCode.HYDRATION_STABLE_TIMEDOUT, message));\n}\n\n/**\n * Verifies whether the DOM contains a special marker added during SSR time to make sure\n * there is no SSR'ed contents transformations happen after SSR is completed. Typically that\n * happens either by CDN or during the build process as an optimization to remove comment nodes.\n * Hydration process requires comment nodes produced by Angular to locate correct DOM segments.\n * When this special marker is *not* present - throw an error and do not proceed with hydration,\n * since it will not be able to function correctly.\n *\n * Note: this function is invoked only on the client, so it's safe to use DOM APIs.\n */\nfunction verifySsrContentsIntegrity(): void {\n  const doc = getDocument();\n  let hydrationMarker: Node|undefined;\n  for (const node of doc.body.childNodes) {\n    if (node.nodeType === Node.COMMENT_NODE &&\n        node.textContent?.trim() === SSR_CONTENT_INTEGRITY_MARKER) {\n      hydrationMarker = node;\n      break;\n    }\n  }\n  if (!hydrationMarker) {\n    throw new RuntimeError(\n        RuntimeErrorCode.MISSING_SSR_CONTENT_INTEGRITY_MARKER,\n        typeof ngDevMode !== 'undefined' && ngDevMode &&\n            'Angular hydration logic detected that HTML content of this page was modified after it ' +\n                'was produced during server side rendering. Make sure that there are no optimizations ' +\n                'that remove comment nodes from HTML enabled on your CDN. Angular hydration ' +\n                'relies on HTML produced by the server, including whitespaces and comment nodes.');\n  }\n}\n"]}