Using OAuth to Access Google APIs | Google Identity

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OAuth 2. Send feedback Using OAuth 2. Google supports common OAuth 2. To begin, obtain OAuth 2.

Access Tokens

Then your client application requests an access token from the Google Authorization Server, extracts a token from the response, and sends the token to the Google API that you want to access. For an interactive demonstration of using OAuth 2. This page gives an overview of the OAuth 2. For details about using OAuth 2. Note: Given the security implications of getting the implementation correct, we strongly encourage you to use OAuth 2.

It is a best practice to use well-debugged code provided by others, and it will help you protect yourself and your users. For more information, see Client libraries. At a high level, you follow get token steps: 1. Obtain OAuth 2. The set of values varies based on what get token of application you are building.

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For example, a JavaScript application does not require a secret, but a web server application does. Obtain an access token from the Google Authorization Server. A single access token can grant varying degrees of access to multiple APIs. A variable parameter called scope controls the set of resources and operations that an access token permits. During the access-token request, your application sends one or more values in the scope parameter. There are several ways to make this request, and they vary based on the type of application you are building.

For example, a JavaScript application might request an access token using a browser redirect to Google, while an application installed on a device that has no browser uses web service requests.

Some requests require an authentication step where the user logs in with their Google account. After logging in, the user get token asked whether they are willing to grant one or get token permissions that your application is requesting. This process is called user consent. If the user grants at least one permission, the Google Authorization Server sends your application an access token or an authorization code that your application can use to obtain an access token and a list of scopes of access granted by that token.

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If the user does not grant the permission, the server returns an error. It is generally a best practice to request scopes incrementally, at the time access is required, rather than up front.

Verify ID Tokens

For example, an app that wants to support saving an event to a calendar should not request Google Calendar access until the user presses the "Add to Calendar" button; see Incremental authorization. Examine scopes of access granted by the user. Compare the scopes included in the access token how to make money on the exmo exchange to the scopes required to access features and functionality of your application get token upon access to a related Google API.

Disable any features of your app unable to function without access to the related API. The scope included in your request may not match the scope included in your response, even if the user granted all requested scopes.

Refer to the documentation for each Google API for the scopes required for access. An API may map multiple scope string values to a single scope of access, returning the same scope string for all values allowed in the request.

Send the access token to an API.

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It is possible to send tokens as URI query-string parameters, but we don't recommend it, because URI parameters can end up in log files that binard options not get token secure. Note that the query-string support will be deprecated on June 1st, Access tokens are valid only for the set of operations and resources described in the scope of the token request.

You can, however, send that access token to the Google Calendar API multiple times for similar operations.

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  • When someone connects with an app using Facebook Login and approves the request for permissions, the app obtains an access token that provides temporary, secure access to Facebook APIs.
  • Access Tokens In this article Access tokens are used in token-based authentication to allow an application to access an API.

Refresh the access token, if necessary. Access tokens have limited lifetimes. If your application needs access to a Google API beyond the lifetime of a single access token, it can obtain a get token token. A refresh token allows your application to obtain new access tokens. Note: Save refresh tokens in get token long-term storage and continue to use them as long as they remain valid. Limits apply to the number of refresh tokens that are issued per client-user combination, and per user across all clients, and these limits are different.

If get token application requests enough refresh tokens to go over one of the limits, older refresh tokens stop working. The authorization sequence begins when your application redirects a browser to a Google URL; the URL includes query parameters that indicate the type of access being requested.

Google handles the user authentication, session selection, and user consent.

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The result is an authorization code, which the application can exchange for an access token and a refresh token. The application should store the refresh token for future use and use the access token to access a Google API. Once the access token expires, the application uses the refresh token get token obtain a new one. For details, see Using OAuth 2. Installed applications The Google OAuth 2.

The process results in a client ID and, in some cases, a client secret, which you embed in the source code of your application. In this context, the client secret is obviously not treated as a secret. The result is an access token, which the client should validate before including it in a Google API request. When the token expires, the application repeats the process. Applications on limited-input devices The Google OAuth 2.

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The authorization sequence begins with the application making a web service request to a Google URL for an authorization code. The response contains several parameters, including a URL and a code that the application shows to the user.

The user obtains the URL and code from the device, then switches to a separate device or computer with richer input capabilities.

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The user launches a browser, navigates to the specified URL, logs in, and enters the code. Meanwhile, the application polls a Google URL at a specified interval. After the user approves access, the response from the Google server contains an access token and refresh token.

App Access Tokens

In these situations your application needs to prove its own identity to the API, but no user consent is necessary. Similarly, in enterprise scenarios, your application can request delegated access to some resources.

For these types of server-to-server interactions you need a service account, which is an account that belongs to your application instead of to an individual end-user. Your application calls Google Get token on behalf of the service account, and user consent is not required.

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In non-service-account scenarios, your application calls Google APIs on behalf of end-users, and user consent is sometimes required. We strongly encourage you to use a library to perform these tasks. If you write this code without using a library that abstracts token creation and signing, you might make errors that would have a severe impact on the security of your application.

For a list of libraries that support this scenario, see the service-account documentation. You use the client ID and one private key to create a signed JWT and construct an access-token request in the appropriate format.

Basic steps

Your application then sends the token request to the Google OAuth 2. The application uses the token to access a Google API. For details, see the service-account documentation.

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For example, a policy set in the G Suite admin console to restrict the ability of G Suite end users to share documents outside of the domain would not apply to service accounts. Token size Tokens can vary in size, up to the following limits: Authorization codes: bytes Access tokens: bytes Refresh tokens: bytes Google reserves the right to change token size within these limits, and your get token must support variable token sizes accordingly.

Refresh token expiration You must write your code to anticipate the possibility that a granted refresh token might no longer work. A refresh token might stop working get token one of these reasons: The refresh token has not been used for six months.

The user changed passwords and the refresh token contains Gmail scopes.