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Getting Started | Google Digital Asset Links | Google for Developers
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M140.89,29.92l3.93,2.62c-1.27,1.88-4.32,5.11-9.61,5.11c-6.55,0-11.28-5.07-11.28-11.53c0-6.86,4.77-11.53,10.71-11.53c5.98,0,8.91,4.76,9.87,7.34l0.52,1.31l-15.42,6.38c1.18,2.31,3.01,3.49,5.59,3.49C137.79,33.11,139.58,31.84,140.89,29.92zM128.79,25.77l10.31-4.28c-0.57-1.44-2.27-2.45-4.28-2.45C132.24,19.04,128.66,21.31,128.79,25.77z"/> </svg>Digital Asset Links </a> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/digital-asset-links" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Home" track-name="home" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Home" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Home </span> </a> </li> <li class="devsite-nav-item"> <a 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</span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/digital-asset-links/v1/samples" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Samples" track-name="samples" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Samples" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Samples </span> </a> </li> <li class="devsite-nav-item"> <a href="/digital-asset-links/tools/generator" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Tools" track-name="tools" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Tools" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Tools </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item"><a href="/digital-asset-links/v1/getting-started" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /digital-asset-links/v1/getting-started" track-type="bookNav" track-name="click" track-metadata-eventdetail="/digital-asset-links/v1/getting-started" ><span class="devsite-nav-text" tooltip>Getting Started</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>How To...</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/digital-asset-links/v1/using" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /digital-asset-links/v1/using" track-type="bookNav" track-name="click" track-metadata-eventdetail="/digital-asset-links/v1/using" ><span class="devsite-nav-text" tooltip>Use Digital Asset Links</span></a></li><li class="devsite-nav-item"><a href="/digital-asset-links/v1/create-statement" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /digital-asset-links/v1/create-statement" track-type="bookNav" track-name="click" track-metadata-eventdetail="/digital-asset-links/v1/create-statement" ><span class="devsite-nav-text" tooltip>Create a Statement</span></a></li><li class="devsite-nav-item"><a href="/digital-asset-links/v1/revocation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /digital-asset-links/v1/revocation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/digital-asset-links/v1/revocation" ><span class="devsite-nav-text" tooltip>Revoke a Statement</span></a></li><li class="devsite-nav-item"><a href="/digital-asset-links/v1/consuming" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /digital-asset-links/v1/consuming" track-type="bookNav" track-name="click" track-metadata-eventdetail="/digital-asset-links/v1/consuming" ><span class="devsite-nav-text" tooltip>Consume a Statement</span></a></li></ul></li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" class="devsite-main-content" has-book-nav > <devsite-content> <article class="devsite-article"> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Home </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/products" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="" > Products </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/digital-asset-links" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Google Digital Asset Links" > Google Digital Asset Links </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/digital-asset-links/v1/getting-started" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="4" track-type="globalNav" track-name="breadcrumb" track-metadata-position="4" track-metadata-eventdetail="" > Guides </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> Getting Started </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <h2 id="overview" data-text="Overview" tabindex="-1">Overview</h2> <p>The Digital Asset Links protocol and API enable an app or website to make public, verifiable <em>statements</em> about other apps or websites. For example, a website can declare that it is associated with a specific Android app, or it can declare that it wants to share user credentials with another website.</p> <p>Here are some possible uses for Digital Asset Links:</p> <ul> <li>Website A declares that links to its site should open in a designated app on mobile devices, if the app is installed.</li> <li>Website A declares that it can share its Chrome user credentials with website B so that the user won't have to log in to website B if it is logged into website A.</li> <li>App A declares that it can share device settings, such as location, with website B.</li> </ul> <h3 id="key-terms" data-text="Key terms" tabindex="-1">Key terms</h3> <ul> <li><strong>Principal:</strong> The principal is the app or website making the statement. In Digital Asset Links, the principal is always the app or website that hosts the statement list.</li> <li><strong>Statement list</strong>: Statements are contained in a <em>statement list</em> that contains one or more statements. A statement list is cleartext and publicly accessible, in a location that is controlled by the principal and difficult to spoof or tamper with. It can be a free-standing file, or a section of another, larger item. For example, on a website, it is an entire file; in an Android app, it is a section in the app manifest. Statements can be viewed and verified by anyone, using non-proprietary methods. <a href="/digital-asset-links/v1/create-statement">See the statement list documentation for more information</a>.</li> <li><strong>Statement: </strong>A statement is a tightly structured JSON construct that consists of a <em>relation</em> (what the statement says to do, for example: Enable sharing credentials) and a <em>target</em> (the website or app that the relation applies to). Therefore, each statement is like a sentence, where <em>principal</em> says <em>relation</em> about <em>target</em>.<br> </li> <li><strong>Statement consumer:</strong> A statement consumer requests a statement list from a principal, checks for the presence of a statement against a given principal, and if it exists, can perform the action specified. <a href="/digital-asset-links/v1/consuming">See the statement comsuming documentation for more information</a><em>.</em></li> </ul> <h2 id="quick-usage-example" data-text="Quick usage example" tabindex="-1">Quick usage example</h2> <p>Here's a very simplified example of how the website www.example.com could use Digital Asset Links to specify that any links to URLs in that site should open in a designated app rather than the browser:</p> <ol> <li>The website www.example.com publishes a statement list at https://www.example.com/.well-known/assetlinks.json. This is the official name and location for a statement list on a site; statement lists in any other location, or with any other name, are not valid for this site. In our example, the statement list consists of one statement, granting its Android app the permission to open links on its site: <div></div><devsite-code><pre translate="no" dir="ltr" is-upgraded>[{ "relation": ["delegate_permission/common.handle_all_urls"], "target" : { "namespace": "android_app", "package_name": "com.example.app", "sha256_cert_fingerprints": ["<var translate="no">hash_of_app_certificate</var>"] } }]</pre></devsite-code> A statement list supports an array of statements within the [ ] marks, but our example file contains only one statement. <code translate="no" dir="ltr">sha256_cert_fingerprints</code> is the SHA256 fingerprints of your app’s signing certificate. Find more details in the <a href="https://developer.android.com/training/app-links/verify-android-applinks#web-assoc" target="_blank">Android App Links documentation</a>.</li> <li>The Android app listed in the statement above has an intent filter that specifies the scheme, host, and path pattern of URLs that it wants to handle: in this case, https://www.example.com. The intent filter includes a special attribute <code translate="no" dir="ltr">android:autoVerify</code>, new to Android M, which indicates that Android should verify the statement on the website described in the intent filter when the app is installed.</li> <li>A user installs the app. Android sees the intent filter with the <code translate="no" dir="ltr">autoVerify</code> attribute and checks for the presence of the statement list at the specified site; if present, Android checks whether that file includes a statement granting link handling to the app, and verifies the app against the statement by certificate hash. If everything checks out, Android will then forward any https://www.example.com intents to the example.com app.</li> <li>The user clicks a link to https://www.example.com/puppies on their device. This link could be anywhere: in a browser, in a Google Search Appliance suggestion, or anywhere else. Android forwards the intent to the example.com app.</li> <li>The example.com app receives the intent and chooses to handle it, opening the puppies page in the app. If for some reason the app had declined to handle the link, or if the app were not on the device, then the link would have been sent to the next default intent handler matching that intent pattern (often the browser).</li> </ol> <h2 id="important-considerations-and-limitations:" data-text="Important considerations and limitations:" tabindex="-1">Important considerations and limitations:</h2> <ul> <li>The protocol does not authenticate the principal making the statement, but the statement is located in a specific location strongly associated with the principal, and under control of the principal.</li> <li>The protocol does not authenticate the statement target, but it provides a means for the caller to authenticate the target (for example, a statement identifies mobile app targets by certificate hash and package name).</li> <li>The protocol does not natively perform any statement actions; rather, it enables the ability to expose statements, which a consuming application must validate and then decide whether and how to act upon. Android M natively performs these steps for you; for example, if a website delegates link handling to a specific app, Android checks and verifies the statement, verifies the target app, and then offers the app the option to handle the given link.</li> <li>The protocol does not enable making statements about two third parties: that is, website A can make a statement about website B, but website A cannot make a statement about website B's relationship to website C. However, if website B trusts website A, it can check website A for a statement granting permission to website C, and decide to implement that.</li> </ul> <h2 id="next-steps" data-text="Next steps" tabindex="-1">Next steps</h2> <ol> <li><a href="/digital-asset-links/v1/using">See if there is explicit documentation for your use case.</a></li> <li><a href="/digital-asset-links/v1/create-statement">Learn about creating a statement.</a></li> </ol> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. For details, see the <a href="https://developers.google.com/site-policies">Google Developers Site Policies</a>. Java is a registered trademark of Oracle and/or its affiliates.</p> <p>Last updated 2024-06-26 UTC.</p> </devsite-content-footer> <devsite-notification > </devsite-notification> <div class="devsite-content-data"> <template class="devsite-content-data-template"> [[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-06-26 UTC."],[[["Digital Asset Links enable apps and websites to make verifiable statements about their relationships with other apps and websites, such as link handling or credential sharing."],["These statements are stored in a publicly accessible statement list, typically an \"assetlinks.json\" file hosted by the app or website making the statement."],["Android M and above automatically uses Digital Asset Links to verify website-to-app associations and direct links to the appropriate app if installed."],["The protocol provides a foundation for trust and delegation between digital entities but relies on consumers to validate and act upon the statements."]]],[]] </template> </div> </devsite-content> </main> <devsite-footer-promos class="devsite-footer"> </devsite-footer-promos> <devsite-footer-linkboxes class="devsite-footer"> <nav class="devsite-footer-linkboxes nocontent" aria-label="Footer links"> <ul class="devsite-footer-linkboxes-list"> <li class="devsite-footer-linkbox "> <h3 class="devsite-footer-linkbox-heading no-link">Product Info</h3> <ul class="devsite-footer-linkbox-list"> <li class="devsite-footer-linkbox-item"> <a href="/digital-asset-links/terms" class="devsite-footer-linkbox-link gc-analytics-event" data-category="Site-Wide Custom Events" 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