OAuth 2.0 for Client-side Web Applications
Send feedback Using OAuth 2. Google supports common OAuth 2. To begin, obtain OAuth 2. 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.
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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.
Using OAuth 2.0 to Access Google APIs
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.
This process is called user consent.
OAuth for Client-side Web Applications | Google Identity
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. If the user does not grant the permission, the server returns an error. Token client is generally a best practice to request scopes incrementally, at the time access is required, rather than up front.
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For example, an token client 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 token client access granted by the user. Compare the scopes included in the access token response to the scopes required token client access features and functionality of your application dependent 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. Token client API may map multiple scope string values to a single scope of access, returning the same scope string for token client values allowed in the request.
Send the access token to an API. 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 are not completely 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 client to the Google Calendar API multiple times for similar operations. 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 refresh token. A refresh token allows your application to obtain new access tokens. Note: Save refresh tokens in secure long-term storage and continue to use them as long as they remain valid.
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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 your application requests enough refresh tokens to go over one of the token client, 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 token client access being token client.
Google handles the user authentication, session selection, and user consent.
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 to obtain a new one.
For details, see Using OAuth token client. 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.
- 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.
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Applications on limited-input devices The Google OAuth 2. The authorization sequence begins with the application making a web service request to a Google URL for an authorization code.
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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.
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 make money on the Internet using video from the Google server contains an access token and refresh token.
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 token client you token client a service account, which is an account that belongs to your application instead of to an individual end-user. Your application calls Google APIs on behalf of the service account, and user consent is not required.