概览
基于 OAuth 的 Google 登录简化关联功能会在 OAuth 关联。这样可以为 Google 用户),它还支持账号创建功能,即允许用户使用其 Google 账号在您的服务中创建新账号。
如需通过 OAuth 和 Google 登录机制执行账号关联,请遵循以下常规 步骤:
- 首先,请用户同意访问其 Google 个人资料。
- 使用用户个人资料中的信息检查用户账号是否存在。
- 对于现有用户,请关联账号。
- 如果您在身份验证系统中找不到与 Google 用户匹配的信息, 验证从 Google 收到的 ID 令牌。然后,您可以根据 对 ID 令牌中包含的个人资料信息有效。
图 1. 通过“精简关联”功能在用户手机上进行账号关联
简化关联的要求
- 实现基本网络 OAuth 关联流程。您的服务必须支持符合 OAuth 2.0 规定 授权端点和令牌交换端点。
- 您的令牌交换端点必须支持 JSON 网络令牌 (JWT) 断言,并实现
check
、create
和get
intent。
实现 OAuth 服务器
您的令牌交换端点必须支持 check
、create
、get
intent。下面显示了通过账号关联流程完成的步骤,并指明了不同 intent 的调用时间:
- 用户在您的身份验证系统中是否有账号?(用户可通过选择“是”或“否”来决定)
<ph type="x-smartling-placeholder">
- </ph>
- 是:用户是否使用与其 Google 账号关联的电子邮件地址登录您的平台?(用户可通过选择“是”或“否”来决定)
<ph type="x-smartling-placeholder">
- </ph>
- 是:用户在您的身份验证系统中是否拥有匹配的账号?(系统会调用
check intent
来进行确认)- 是:如果成功返回 get intent,系统会调用
get intent
并关联账号。 - 否 :要创建新账号吗?(用户可通过选择“是”或“否”来决定)
<ph type="x-smartling-placeholder">
- </ph>
- 是:如果成功返回 create intent,系统会调用
create intent
并关联账号。 - 否 :会触发网络 OAuth 流程,将用户定向到其浏览器,并为用户提供链接到其他电子邮件的选项。
- 是:如果成功返回 create intent,系统会调用
- 是:如果成功返回 get intent,系统会调用
- 否:触发网络 OAuth 流程,将用户定向到其浏览器,并为用户提供用于链接到其他电子邮件的选项。
- 是:用户在您的身份验证系统中是否拥有匹配的账号?(系统会调用
- 否:用户在您的身份验证系统中是否拥有匹配的账号?(系统会调用
check intent
来进行确认)- 是:如果成功返回 get intent,系统会调用
get intent
并关联账号。 - 否:如果成功返回 create intent,系统会调用
create intent
并关联账号。
- 是:如果成功返回 get intent,系统会调用
- 是:用户是否使用与其 Google 账号关联的电子邮件地址登录您的平台?(用户可通过选择“是”或“否”来决定)
<ph type="x-smartling-placeholder">
Check for an existing user account (check intent)
After the user gives consent to access their Google profile, Google sends a request that contains a signed assertion of the Google user's identity. The assertion contains information that includes the user's Google Account ID, name, and email address. The token exchange endpoint configured for your project handles that request.
If the corresponding Google account is already present in your authentication
system, your token exchange endpoint responds with account_found=true
. If the
Google account doesn't match an existing user, your token exchange endpoint
returns an HTTP 404 Not Found error with account_found=false
.
The request has the following form:
POST /token HTTP/1.1 Host: oauth2.example.com Content-Type: application/x-www-form-urlencoded grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&intent=check&assertion=JWT&scope=SCOPES&client_id=GOOGLE_CLIENT_ID&client_secret=GOOGLE_CLIENT_SECRET
Your token exchange endpoint must be able to handle the following parameters:
Token endpoint parameters | |
---|---|
intent |
For these requests, the value of this parameter is
check . |
grant_type |
The type of token being exchanged. For these requests, this
parameter has the value urn:ietf:params:oauth:grant-type:jwt-bearer . |
assertion |
A JSON Web Token (JWT) that provides a signed assertion of the Google user's identity. The JWT contains information that includes the user's Google Account ID, name, and email address. |
client_id |
The client ID you assigned to Google. |
client_secret |
The client secret you assigned to Google. |
To respond to the check
intent requests, your token exchange endpoint must perform the following steps:
- Validate and decode the JWT assertion.
- Check if the Google account is already present in your authentication system.
Validate and decode the JWT assertion
You can validate and decode the JWT assertion by using a JWT-decoding library for your language. Use Google's public keys, available in JWK or PEM formats, to verify the token's signature.
When decoded, the JWT assertion looks like the following example:
{ "sub": "1234567890", // The unique ID of the user's Google Account "iss": "https://accounts.google.com", // The assertion's issuer "aud": "123-abc.apps.googleusercontent.com", // Your server's client ID "iat": 233366400, // Unix timestamp of the assertion's creation time "exp": 233370000, // Unix timestamp of the assertion's expiration time "name": "Jan Jansen", "given_name": "Jan", "family_name": "Jansen", "email": "jan@gmail.com", // If present, the user's email address "email_verified": true, // true, if Google has verified the email address "hd": "example.com", // If present, the host domain of the user's GSuite email address // If present, a URL to user's profile picture "picture": "https://lh3.googleusercontent.com/a-/AOh14GjlTnZKHAeb94A-FmEbwZv7uJD986VOF1mJGb2YYQ", "locale": "en_US" // User's locale, from browser or phone settings }
In addition to verifying the token's signature, verify that the assertion's
issuer (iss
field) is https://accounts.google.com
, that the audience
(aud
field) is your assigned client ID, and that the token has not expired
(exp
field).
Using the email
, email_verified
and hd
fields you can determine if
Google hosts and is authoritative for an email address. In cases where Google is
authoritative the user is currently known to be the legitimate account owner
and you may skip password or other challenges methods. Otherwise, these methods
can be used to verify the account prior to linking.
Cases where Google is authoritative:
email
has a@gmail.com
suffix, this is a Gmail account.email_verified
is true andhd
is set, this is a G Suite account.
Users may register for Google Accounts without using Gmail or G Suite. When
email
does not contain a @gmail.com
suffix and hd
is absent Google is not
authoritative and password or other challenge methods are recommended to verify
the user. email_verified
can also be true as Google initially verified the
user when the Google account was created, however ownership of the third party
email account may have since changed.
Check if the Google account is already present in your authentication system
Check whether either of the following conditions are true:
- The Google Account ID, found in the assertion's
sub
field, is in your user database. - The email address in the assertion matches a user in your user database.
If either condition is true, the user has already signed up. In that case, return a response like the following:
HTTP/1.1 200 Success Content-Type: application/json;charset=UTF-8 { "account_found":"true", }
If neither the Google Account ID nor the email address specified in the
assertion matches a user in your database, the user hasn't signed up yet. In
this case, your token exchange endpoint needs to reply with a HTTP 404 error
that specifies "account_found": "false"
, as in the following example:
HTTP/1.1 404 Not found Content-Type: application/json;charset=UTF-8 { "account_found":"false", }
Handle automatic linking (get intent)
After the user gives consent to access their Google profile, Google sends a request that contains a signed assertion of the Google user's identity. The assertion contains information that includes the user's Google Account ID, name, and email address. The token exchange endpoint configured for your project handles that request.
If the corresponding Google Account is already present in your authentication
system, your token exchange endpoint returns a token for the user. If the
Google Account doesn't match an existing user, your token exchange endpoint
returns a linking_error
error and optional login_hint
.
The request has the following form:
POST /token HTTP/1.1 Host: oauth2.example.com Content-Type: application/x-www-form-urlencoded grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&intent=get&assertion=JWT&scope=SCOPES&client_id=GOOGLE_CLIENT_ID&client_secret=GOOGLE_CLIENT_SECRET
Your token exchange endpoint must be able to handle the following parameters:
Token endpoint parameters | |
---|---|
intent |
For these requests, the value of this parameter is get . |
grant_type |
The type of token being exchanged. For these requests, this
parameter has the value urn:ietf:params:oauth:grant-type:jwt-bearer . |
assertion |
A JSON Web Token (JWT) that provides a signed assertion of the Google user's identity. The JWT contains information that includes the user's Google Account ID, name, and email address. |
scope |
Optional: Any scopes that you've configured Google to request from users. |
client_id |
The client ID you assigned to Google. |
client_secret |
The client secret you assigned to Google. |
To respond to the get
intent requests, your token exchange endpoint must perform the following steps:
- Validate and decode the JWT assertion.
- Check if the Google account is already present in your authentication system.
Validate and decode the JWT assertion
You can validate and decode the JWT assertion by using a JWT-decoding library for your language. Use Google's public keys, available in JWK or PEM formats, to verify the token's signature.
When decoded, the JWT assertion looks like the following example:
{ "sub": "1234567890", // The unique ID of the user's Google Account "iss": "https://accounts.google.com", // The assertion's issuer "aud": "123-abc.apps.googleusercontent.com", // Your server's client ID "iat": 233366400, // Unix timestamp of the assertion's creation time "exp": 233370000, // Unix timestamp of the assertion's expiration time "name": "Jan Jansen", "given_name": "Jan", "family_name": "Jansen", "email": "jan@gmail.com", // If present, the user's email address "email_verified": true, // true, if Google has verified the email address "hd": "example.com", // If present, the host domain of the user's GSuite email address // If present, a URL to user's profile picture "picture": "https://lh3.googleusercontent.com/a-/AOh14GjlTnZKHAeb94A-FmEbwZv7uJD986VOF1mJGb2YYQ", "locale": "en_US" // User's locale, from browser or phone settings }
In addition to verifying the token's signature, verify that the assertion's
issuer (iss
field) is https://accounts.google.com
, that the audience
(aud
field) is your assigned client ID, and that the token has not expired
(exp
field).
Using the email
, email_verified
and hd
fields you can determine if
Google hosts and is authoritative for an email address. In cases where Google is
authoritative the user is currently known to be the legitimate account owner
and you may skip password or other challenges methods. Otherwise, these methods
can be used to verify the account prior to linking.
Cases where Google is authoritative:
email
has a@gmail.com
suffix, this is a Gmail account.email_verified
is true andhd
is set, this is a G Suite account.
Users may register for Google Accounts without using Gmail or G Suite. When
email
does not contain a @gmail.com
suffix and hd
is absent Google is not
authoritative and password or other challenge methods are recommended to verify
the user. email_verified
can also be true as Google initially verified the
user when the Google account was created, however ownership of the third party
email account may have since changed.
Check if the Google account is already present in your authentication system
Check whether either of the following conditions are true:
- The Google Account ID, found in the assertion's
sub
field, is in your user database. - The email address in the assertion matches a user in your user database.
If an account is found for the user, issue an access token and return the values in a JSON object in the body of your HTTPS response, like in the following example:
{ "token_type": "Bearer", "access_token": "ACCESS_TOKEN", "expires_in": SECONDS_TO_EXPIRATION }
In some cases, account linking based on ID token might fail for the user. If it
does so for any reason, your token exchange endpoint needs to reply with a HTTP
401 error that specifies error=linking_error
, as the following example shows:
HTTP/1.1 401 Unauthorized Content-Type: application/json;charset=UTF-8 { "error":"linking_error", "login_hint":"foo@bar.com" }
When Google receives a 401 error response with linking_error
, Google sends
the user to your authorization endpoint with login_hint
as a parameter. The
user completes account linking using the OAuth linking flow in their browser.
通过 Google 登录功能处理账号创建(创建 intent)
当用户需要在您的服务中创建账号时,Google 会发出请求
发送到指定 intent=create
的令牌交换端点。
请求的格式如下:
POST /token HTTP/1.1 Host: oauth2.example.com Content-Type: application/x-www-form-urlencoded response_type=token&grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&scope=SCOPES&intent=create&assertion=JWT&client_id=GOOGLE_CLIENT_ID&client_secret=GOOGLE_CLIENT_SECRET
您的令牌交换端点必须能够处理以下参数:
令牌端点参数 | |
---|---|
intent |
对于这些请求,此参数的值为 create 。 |
grant_type |
所交换的令牌的类型。对于这类请求
参数的值为 urn:ietf:params:oauth:grant-type:jwt-bearer 。 |
assertion |
一个 JSON Web 令牌 (JWT),提供 Google 用户身份。JWT 包含的信息包括用户 Google 账号 ID、姓名和电子邮件地址。 |
client_id |
您分配给 Google 的客户 ID。 |
client_secret |
您分配给 Google 的客户端密钥。 |
assertion
参数中的 JWT 包含用户的 Google 账号 ID。
姓名和电子邮件地址,可用于在 Gmail 中创建新账号
服务。
如需响应 create
intent 请求,您的令牌交换端点必须执行以下步骤:
- 验证和解码 JWT 断言。
- 验证用户信息并创建新账号。
Validate and decode the JWT assertion
You can validate and decode the JWT assertion by using a JWT-decoding library for your language. Use Google's public keys, available in JWK or PEM formats, to verify the token's signature.
When decoded, the JWT assertion looks like the following example:
{ "sub": "1234567890", // The unique ID of the user's Google Account "iss": "https://accounts.google.com", // The assertion's issuer "aud": "123-abc.apps.googleusercontent.com", // Your server's client ID "iat": 233366400, // Unix timestamp of the assertion's creation time "exp": 233370000, // Unix timestamp of the assertion's expiration time "name": "Jan Jansen", "given_name": "Jan", "family_name": "Jansen", "email": "jan@gmail.com", // If present, the user's email address "email_verified": true, // true, if Google has verified the email address "hd": "example.com", // If present, the host domain of the user's GSuite email address // If present, a URL to user's profile picture "picture": "https://lh3.googleusercontent.com/a-/AOh14GjlTnZKHAeb94A-FmEbwZv7uJD986VOF1mJGb2YYQ", "locale": "en_US" // User's locale, from browser or phone settings }
In addition to verifying the token's signature, verify that the assertion's
issuer (iss
field) is https://accounts.google.com
, that the audience
(aud
field) is your assigned client ID, and that the token has not expired
(exp
field).
Using the email
, email_verified
and hd
fields you can determine if
Google hosts and is authoritative for an email address. In cases where Google is
authoritative the user is currently known to be the legitimate account owner
and you may skip password or other challenges methods. Otherwise, these methods
can be used to verify the account prior to linking.
Cases where Google is authoritative:
email
has a@gmail.com
suffix, this is a Gmail account.email_verified
is true andhd
is set, this is a G Suite account.
Users may register for Google Accounts without using Gmail or G Suite. When
email
does not contain a @gmail.com
suffix and hd
is absent Google is not
authoritative and password or other challenge methods are recommended to verify
the user. email_verified
can also be true as Google initially verified the
user when the Google account was created, however ownership of the third party
email account may have since changed.
验证用户信息并创建新账号
请检查以下任一条件是否成立:
- Google 账号 ID(可在断言的
sub
字段中找到)位于您的用户中 数据库。 - 断言中的电子邮件地址与用户数据库中的用户匹配。
如果满足上述任一条件,请提示用户关联其现有账号
与其 Google 账号关联。为此,请使用 HTTP 401 错误响应请求
该参数指定 error=linking_error
并将用户的电子邮件地址作为
login_hint
。以下是示例响应:
HTTP/1.1 401 Unauthorized Content-Type: application/json;charset=UTF-8 { "error":"linking_error", "login_hint":"foo@bar.com" }
当 Google 收到包含 linking_error
的 401 错误响应时,会发送
使用 login_hint
作为参数将用户发送到您的授权端点。通过
用户在浏览器中使用 OAuth 关联流程完成账号关联。
如果以上两个条件都不满足,请使用相应信息创建一个新的用户账号 。新账号通常不会设置密码。时间是 建议您将 Google 登录功能添加到其他平台,以便用户 使用 Google 账号登录。或者 可以通过电子邮件向用户发送链接,启动密码恢复流程,以允许 用户设置密码,以便在其他平台上登录。
创建完成后,发出一个访问令牌 并在 HTTPS 响应的正文,如以下示例所示:
{ "token_type": "Bearer", "access_token": "ACCESS_TOKEN", "expires_in": SECONDS_TO_EXPIRATION }
获取您的 Google API 客户端 ID
在账号关联注册过程中,系统会要求您提供 Google API 客户端 ID。
使用您在完成 OAuth 关联步骤时创建的项目获取 API 客户端 ID。为此,请完成以下步骤:
- 打开凭据页面 Google API 控制台。
创建或选择 Google API 项目。
如果您的项目没有 Web 应用类型的客户端 ID,请点击 创建凭据 >OAuth 客户端 ID 创建一个凭据。请确保包含 在已获授权的 JavaScript 来源框中,输入您网站的网域。当您执行 本地测试或开发,则必须同时添加
http://localhost
和http://localhost:<port_number>
添加到已获授权的 JavaScript 来源字段中。
验证您的实现
您可以使用 OAuth 2.0 Playground 工具验证您的实现。
在该工具中,执行以下步骤:
- 点击配置 以打开 OAuth 2.0 配置窗口。
- 在 OAuth flow 字段中,选择 Client-side(客户端)。
- 在 OAuth 端点字段中,选择自定义。
- 在相应字段中指定您的 OAuth 2.0 端点和您分配给 Google 的客户端 ID。
- 在第 1 步部分,不要选择任何 Google 范围。请将此字段留空或输入对服务器有效的范围(如果您不使用 OAuth 范围,则可以输入任意字符串)。完成后,点击授权 API。
- 在 Step 2 和 Step 3 部分中,完成 OAuth 2.0 流程,并验证每个步骤是否按预期运行。
您可以使用 Google 账号关联演示版工具验证您的实现。
在该工具中,执行以下步骤:
- 点击使用 Google 账号登录按钮。
- 选择您要关联的账号。
- 输入服务 ID。
- (可选)输入您要请求访问权限的一个或多个范围。
- 点击开始演示。
- 当系统提示时,请确认您同意或拒绝关联请求。
- 确认您已被重定向到您的平台。