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href="/oauth2-servers/accessing-data/create-an-application/" data-section="2.1">Create an Application</a></li> <li class="page_item page-item-903"><a href="/oauth2-servers/accessing-data/setting-up-the-environment/" data-section="2.2">Setting up the Environment</a></li> <li class="page_item page-item-907"><a href="/oauth2-servers/accessing-data/authorization-request/" data-section="2.3">Authorization Request</a></li> <li class="page_item page-item-910"><a href="/oauth2-servers/accessing-data/obtaining-an-access-token/" data-section="2.4">Obtaining an Access Token</a></li> <li class="page_item page-item-912"><a href="/oauth2-servers/accessing-data/making-api-requests/" data-section="4.5">Making API Requests</a></li> </ul> </li> <li class="page_item page-item-28 page_item_has_children current_page_ancestor current_page_parent"><a href="/oauth2-servers/signing-in-with-google/" data-section="3">Signing in with Google</a> <ul class='children'> <li class="page_item page-item-883"><a href="/oauth2-servers/signing-in-with-google/create-an-application/" data-section="3.1">Create an Application</a></li> <li class="page_item page-item-886"><a href="/oauth2-servers/signing-in-with-google/setting-up-the-environment/" data-section="3.2">Setting up the Environment</a></li> <li class="page_item page-item-888 current_page_item"><a href="/oauth2-servers/signing-in-with-google/authorization-request/" data-section="3.3">Authorization Request</a></li> <li class="page_item page-item-891"><a href="/oauth2-servers/signing-in-with-google/getting-an-id-token/" data-section="3.4">Getting an ID Token</a></li> <li class="page_item page-item-893"><a href="/oauth2-servers/signing-in-with-google/verifying-the-user-info/" data-section="3.5">Verifying the User Info</a></li> </ul> </li> <li class="page_item page-item-95 page_item_has_children"><a href="/oauth2-servers/server-side-apps/" data-section="4">Server-Side Apps</a> <ul class='children'> <li class="page_item page-item-865"><a href="/oauth2-servers/server-side-apps/authorization-code/" data-section="4.1">Authorization Code Grant</a></li> <li class="page_item page-item-869"><a href="/oauth2-servers/server-side-apps/example-flow/" data-section="4.2">Example Flow</a></li> <li class="page_item page-item-872"><a href="/oauth2-servers/server-side-apps/possible-errors/" data-section="4.3">Possible Errors</a></li> <li class="page_item page-item-874"><a href="/oauth2-servers/server-side-apps/user-experience/" data-section="4.4">User Experience and Security Considerations</a></li> </ul> </li> <li class="page_item page-item-36 page_item_has_children"><a href="/oauth2-servers/single-page-apps/" data-section="5">Single-Page Apps</a> <ul class='children'> <li class="page_item page-item-856"><a href="/oauth2-servers/single-page-apps/authorization/" data-section="5.1">Authorization</a></li> <li class="page_item page-item-850"><a href="/oauth2-servers/single-page-apps/example-flow/" data-section="5.2">Example Flow</a></li> <li class="page_item page-item-847"><a href="/oauth2-servers/single-page-apps/implicit-flow/" data-section="5.3">Implicit Flow for Single-Page Apps</a></li> <li class="page_item page-item-854"><a href="/oauth2-servers/single-page-apps/security-considerations/" data-section="5.4">Security Considerations for Single-Page Apps</a></li> </ul> </li> <li class="page_item page-item-33 page_item_has_children"><a href="/oauth2-servers/mobile-and-native-apps/" data-section="6">Mobile and Native Apps</a> <ul class='children'> <li class="page_item page-item-838"><a href="/oauth2-servers/mobile-and-native-apps/authorization/" data-section="6.1">Authorization</a></li> <li class="page_item page-item-841"><a href="/oauth2-servers/mobile-and-native-apps/security-considerations/" data-section="6.2">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-138 page_item_has_children"><a href="/oauth2-servers/making-authenticated-requests/" data-section="7">Making Authenticated Requests</a> <ul class='children'> <li class="page_item page-item-833"><a href="/oauth2-servers/making-authenticated-requests/refreshing-an-access-token/" data-section="7.1">Refresh Tokens</a></li> </ul> </li> <li class="page_item page-item-140 page_item_has_children"><a href="/oauth2-servers/client-registration/" data-section="8">Client Registration</a> <ul class='children'> <li class="page_item page-item-142"><a href="/oauth2-servers/client-registration/registering-new-application/" data-section="8.1">Registering a New Application</a></li> <li class="page_item page-item-144"><a href="/oauth2-servers/client-registration/client-id-secret/" data-section="8.2">The Client ID and Secret</a></li> <li class="page_item page-item-146"><a href="/oauth2-servers/client-registration/deleting-applications-revoking-secrets/" data-section="8.3">Deleting Applications and Revoking Secrets</a></li> </ul> </li> <li class="page_item page-item-148 page_item_has_children"><a href="/oauth2-servers/authorization/" data-section="9">Authorization</a> <ul class='children'> <li class="page_item page-item-161"><a href="/oauth2-servers/authorization/the-authorization-request/" data-section="9.1">The Authorization Request</a></li> <li class="page_item page-item-164"><a href="/oauth2-servers/authorization/requiring-user-login/" data-section="9.2">Requiring User Login</a></li> <li class="page_item page-item-166"><a href="/oauth2-servers/authorization/the-authorization-interface/" data-section="9.3">The Authorization Interface</a></li> <li class="page_item page-item-168"><a href="/oauth2-servers/authorization/the-authorization-response/" data-section="9.4">The Authorization Response</a></li> <li class="page_item page-item-170"><a href="/oauth2-servers/authorization/security-considerations/" data-section="9.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-174 page_item_has_children"><a href="/oauth2-servers/scope/" data-section="10">Scope</a> <ul class='children'> <li class="page_item page-item-177"><a href="/oauth2-servers/scope/defining-scopes/" data-section="10.1">Defining Scopes</a></li> <li class="page_item page-item-179"><a href="/oauth2-servers/scope/user-interface/" data-section="10.2">User Interface</a></li> <li class="page_item page-item-181"><a href="/oauth2-servers/scope/checkboxes/" data-section="10.3">Checkboxes</a></li> </ul> </li> <li class="page_item page-item-184 page_item_has_children"><a href="/oauth2-servers/redirect-uris/" data-section="11">Redirect URLs</a> <ul class='children'> <li class="page_item page-item-186"><a href="/oauth2-servers/redirect-uris/redirect-uri-registration/" data-section="11.1">Redirect URL Registration</a></li> <li class="page_item page-item-188"><a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/" data-section="11.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-190"><a href="/oauth2-servers/redirect-uris/redirect-uri-validation/" data-section="11.3">Redirect URL Validation</a></li> </ul> </li> <li class="page_item page-item-194 page_item_has_children"><a href="/oauth2-servers/access-tokens/" data-section="12">Access Tokens</a> <ul class='children'> <li class="page_item page-item-196"><a href="/oauth2-servers/access-tokens/authorization-code-request/" data-section="12.1">Authorization Code Request</a></li> <li class="page_item page-item-198"><a href="/oauth2-servers/access-tokens/password-grant/" data-section="12.2">Password Grant</a></li> <li class="page_item page-item-200"><a href="/oauth2-servers/access-tokens/client-credentials/" data-section="12.3">Client Credentials</a></li> <li class="page_item page-item-202"><a href="/oauth2-servers/access-tokens/access-token-response/" data-section="12.4">Access Token Response</a></li> <li class="page_item page-item-204"><a href="/oauth2-servers/access-tokens/self-encoded-access-tokens/" data-section="12.5">Self-Encoded Access Tokens</a></li> <li class="page_item page-item-206"><a href="/oauth2-servers/access-tokens/access-token-lifetime/" data-section="12.6">Access Token Lifetime</a></li> <li class="page_item page-item-208"><a href="/oauth2-servers/access-tokens/refreshing-access-tokens/" data-section="12.7">Refreshing Access Tokens</a></li> </ul> </li> <li class="page_item page-item-210 page_item_has_children"><a href="/oauth2-servers/listing-authorizations/" data-section="13">Listing Authorizations</a> <ul class='children'> <li class="page_item page-item-212"><a href="/oauth2-servers/listing-authorizations/revoking-access/" data-section="13.1">Revoking Access</a></li> </ul> </li> <li class="page_item page-item-216"><a href="/oauth2-servers/the-resource-server/" data-section="14">The Resource Server</a></li> <li class="page_item page-item-608 page_item_has_children"><a href="/oauth2-servers/oauth-native-apps/" data-section="15">OAuth for Native Apps</a> <ul class='children'> <li class="page_item page-item-614"><a href="/oauth2-servers/oauth-native-apps/use-system-browser/" data-section="15.1">Use a System Browser</a></li> <li class="page_item page-item-620"><a href="/oauth2-servers/oauth-native-apps/redirect-urls-for-native-apps/" data-section="15.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-626"><a href="/oauth2-servers/oauth-native-apps/pkce/" data-section="15.3">PKCE Extension</a></li> <li class="page_item page-item-627"><a href="/oauth2-servers/oauth-native-apps/checklist-server-support-native-apps/" data-section="15.4">Checklist for Server Support for Native Apps</a></li> </ul> </li> <li class="page_item page-item-640 page_item_has_children"><a href="/oauth2-servers/device-flow/" data-section="16">OAuth for Browserless and Input-Constrained Devices</a> <ul class='children'> <li class="page_item page-item-643"><a href="/oauth2-servers/device-flow/user-flow/" data-section="16.1">User Flow</a></li> <li class="page_item page-item-656"><a href="/oauth2-servers/device-flow/authorization-request/" data-section="16.2">Authorization Request</a></li> <li class="page_item page-item-660"><a href="/oauth2-servers/device-flow/token-request/" data-section="16.3">Token Request</a></li> <li class="page_item page-item-662"><a href="/oauth2-servers/device-flow/authorization-server-requirements/" data-section="16.4">Authorization Server Requirements</a></li> <li class="page_item page-item-666"><a href="/oauth2-servers/device-flow/security-considerations/" data-section="16.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-668 page_item_has_children"><a href="/oauth2-servers/pkce/" data-section="17">Protecting Apps with PKCE</a> <ul class='children'> <li class="page_item page-item-670"><a href="/oauth2-servers/pkce/authorization-request/" data-section="17.1">Authorization Request</a></li> <li class="page_item page-item-673"><a href="/oauth2-servers/pkce/authorization-code-exchange/" data-section="17.2">Authorization Code Exchange</a></li> </ul> </li> <li class="page_item page-item-214"><a href="/oauth2-servers/token-introspection-endpoint/" data-section="18">Token Introspection Endpoint</a></li> <li class="page_item page-item-220"><a href="/oauth2-servers/creating-documentation/" data-section="19">Creating Documentation</a></li> <li class="page_item page-item-108"><a href="/oauth2-servers/definitions/" data-section="20">Terminology Reference</a></li> <li class="page_item page-item-136 page_item_has_children"><a href="/oauth2-servers/differences-between-oauth-1-2/" data-section="21">Differences Between OAuth 1 and 2</a> <ul class='children'> <li class="page_item page-item-225"><a href="/oauth2-servers/differences-between-oauth-1-2/authentication-and-signatures/" data-section="21.1">Authentication and Signatures</a></li> <li class="page_item page-item-227"><a href="/oauth2-servers/differences-between-oauth-1-2/user-experience-alternative-token-issuance-options/" data-section="21.2">User Experience and Alternative Token Issuance Options</a></li> <li class="page_item page-item-229"><a href="/oauth2-servers/differences-between-oauth-1-2/performance-at-scale/" data-section="21.3">Performance at Scale</a></li> <li class="page_item page-item-231"><a href="/oauth2-servers/differences-between-oauth-1-2/bearer-tokens/" data-section="21.4">Bearer Tokens</a></li> <li class="page_item page-item-233"><a href="/oauth2-servers/differences-between-oauth-1-2/short-lived-tokens-long-lived-authorizations/" data-section="21.5">Short-lived tokens with Long-lived authorizations</a></li> <li class="page_item page-item-235"><a href="/oauth2-servers/differences-between-oauth-1-2/separation-of-roles/" data-section="21.6">Separation of Roles</a></li> </ul> </li> <li class="page_item page-item-676 page_item_has_children"><a href="/oauth2-servers/openid-connect/" data-section="22">OpenID Connect</a> <ul class='children'> <li class="page_item page-item-678"><a href="/oauth2-servers/openid-connect/authorization-vs-authentication/" data-section="22.1">Authorization vs Authentication</a></li> <li class="page_item page-item-680"><a href="/oauth2-servers/openid-connect/building-an-authentication-framework/" data-section="22.2">Building an Authentication Framework</a></li> <li class="page_item page-item-682"><a href="/oauth2-servers/openid-connect/id-tokens/" data-section="22.3">ID Tokens</a></li> <li class="page_item page-item-684"><a href="/oauth2-servers/openid-connect/summary/" data-section="22.4">Summary</a></li> </ul> </li> <li class="page_item page-item-686 page_item_has_children"><a href="/oauth2-servers/indieauth/" data-section="23">IndieAuth</a> <ul class='children'> <li class="page_item page-item-738"><a href="/oauth2-servers/indieauth/discovery/" data-section="23.1">Discovery</a></li> <li class="page_item page-item-688"><a href="/oauth2-servers/indieauth/sign-in/" data-section="23.2">IndieAuth Sign-In Workflow</a></li> <li class="page_item page-item-690"><a href="/oauth2-servers/indieauth/authorization/" data-section="23.3">IndieAuth Authorization Workflow</a></li> </ul> </li> <li class="page_item page-item-693"><a href="/oauth2-servers/map-oauth-2-0-specs/" data-section="24">Map of OAuth 2.0 Specs</a></li> <li class="page_item page-item-697"><a href="/oauth2-servers/tools-and-libraries/" data-section="25">Tools and Libraries</a></li> <li class="page_item page-item-715"><a href="/oauth2-servers/appendix/">Appendix</a></li> </ul> </li> </ul>  </nav>   <a id="menu-icon-close" href="#"> <?xml version="1.0" encoding="UTF-8"?> <svg width="15px" height="15px" viewBox="0 0 15 15" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">  <title>Close</title> <desc>Created with Sketch.</desc> <defs></defs> <g id="Design" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"> <g id="OAuth---Table-of-Contents-Menu" transform="translate(-1292.000000, -30.000000)" fill-rule="nonzero" fill="#333333"> <g id="ToC-Menu-Open" transform="translate(993.000000, -16.000000)"> <g id="Close" transform="translate(299.000000, 46.000000)"> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape" transform="translate(7.430420, 7.430420) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape-Copy" transform="translate(7.430420, 7.430420) scale(-1, 1) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> </g> </g> </g> </g> </svg> </a> </div>  </header>  </div>  <div id="body" class="clearfix">  <div id="valprop"> <header class="valprop-content"> <h1 class="page-title"> Authorization Request </h1> </header> <span class="section-number">3.3</span> </div>   <div id="layout" class="pagewidth-narrow clearfix">  <div id="content" class="clearfix"> <div id="page-888" class="type-page">  <time datetime="2018-07-12"></time> <h1 class="page-title"> </h1>  <div class="page-content entry-content"> <p>Now that we have the necessary variables set up, let’s start the OAuth process.</p> <p>The first thing we’ll have people do is visit this page with <code>?action=login</code> in the query string to kick off the process.</p> <p>Note that scopes in this request are now OpenID Connect scopes, “openid email”, indicating that we are not requesting access to the user’s Google data, just wanting to know who they are.</p> <p>Also note that we are using the <code>response_type=code</code> parameter to indicate that we want Google to return an authorization code that we’ll exchange for the <code>id_token</code> later.</p> <pre class="brush: php; title: ; notranslate" title=""> // Start the login process by sending the user // to Google's authorization page if(isset($_GET['action']) && $_GET['action'] == 'login') { unset($_SESSION['user_id']); // Generate a random string and store in the session $_SESSION['state'] = bin2hex(random_bytes(16)); $params = array( 'response_type' => 'code', 'client_id' => $googleClientID, 'redirect_uri' => $baseURL, 'scope' => 'openid email', 'state' => $_SESSION['state'] ); // Redirect the user to Google's authorization page header('Location: '.$authorizeURL.'?'.http_build_query($params)); die(); } </pre> <p>It’s important to generate a “state” parameter to use to protect the client from CSRF attacks. This is a random string that the client generates and stores in the session. Our app will verify that that state parameter in the redirect from Google matches the one that was created at the start of the flow.</p> <p>We build up an authorization URL and then send the user there. The URL contains our public client ID, the redirect URL which we previously registered with Google, the scope we’re requesting, and the “state” parameter.</p> <figure id="attachment_889" aria-describedby="caption-attachment-889" style="width: 879px" class="wp-caption alignnone"><img src="/wp-content/uploads/2018/07/google_oauth_prompt-879x1024.png" alt="" width="879" height="1024" class="size-large wp-image-889" srcset="/wp-content/uploads/2018/07/google_oauth_prompt-879x1024.png 879w, /wp-content/uploads/2018/07/google_oauth_prompt-258x300.png 258w, /wp-content/uploads/2018/07/google_oauth_prompt-768x894.png 768w, /wp-content/uploads/2018/07/google_oauth_prompt.png 1022w" sizes="(max-width: 879px) 100vw, 879px" /><figcaption id="caption-attachment-889" class="wp-caption-text">Google’s Authorization Request</figcaption></figure> <p>If the user is already logged in to Google, they’ll see an account chooser screen as shown above asking them to choose an existing account or use a different account. Notice that this screen does not look like a typical OAuth screen, because the user isn’t granting any permissions to the application, it’s just trying to identify them.</p> <p>When the user selects an account, they will be redirected back to our page with <code>code</code> and <code>state</code> parameters in the request. The next step is to exchange the authorization code for an access token at the Google API.</p> <div id="themify_builder_content-888" data-postid="888" class="themify_builder_content themify_builder_content-888 themify_builder"> </div>    </div>  </div> </div>  <nav id="page"> <div class="alignleft"> <a href="/oauth2-servers/signing-in-with-google/setting-up-the-environment/"><span>Previous Chapter</span>Setting up the Environment</a> </div> <div class="alignright"> <a href="/oauth2-servers/signing-in-with-google/getting-an-id-token/"><span>Next Chapter</span>Getting an ID Token</a> </div> </nav> </div>  </div>  <div id="footerwrap" > <footer id="footer" class="pagewidth clearfix" itemscope="itemscope" itemtype="https://schema.org/WPFooter"> <div class="Row u-Flex u-Stretch"> <div class="no-hassle Column--6 Column--medium-12"> <h3>Want to implement OAuth 2.0 without the hassle?</h3> <p>We've built API access management as a service that is secure, scalable, and always on, so you can 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