oauth tutorial - OAuth Implicit Requests and Responses - oauth2 tutorial - oauth authentication




What are implicit requests and responses in OAuth 2.0?

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  • The implicit grant type is used to obtain access tokens and is optimized for public clients known to operate a particular redirection URI.
  • The implicit grant type does not include client authentication, and relies on the presence of the resource owner and the registration of the redirection URI
  • The implicit grant consists of only one request and one response.

Implicit Grant Request

  • The implicit grant request type makes separate requests for authorization and for an access token, the client receives the access token as the result of the authorization request.
  • These implicit grant request type clients are typically implemented in a browser using a scripting language such as JavaScript.
  • Hence ,the implicit grant request contains the following parameters which is given below:
Parameters Description
response_type Required. Must be set to token.
client_id Required. The client identifier as assigned by the authorization server, when the client was registered.
redirect_uri Optional. The redirect URI registered by the client.
scope Optional. The possible scope of the request.
state Optional (recommended). Any client state that needs to be passed on to the client request URI.

Implicit Grant Response

  • The implicit grant response is similar to the authorization code grant with two distinct differences.
  • The Implicit Grant response is an OAuth 2.0 flow that client-side apps use in order to access an API.
  • The implicit grant response contains the following parameters which is given below
Parameters Description
access_token Required. The access token assigned by the authorization server.
token_type Required. The type of the token
expires_in Recommended. A number of seconds after which the access token expires.
scope Optional. The scope of the access token.
state Required, if present in the autorization request. Must be same value as stateparameter in request.

Implicit Grant Error Response

  • If an error occurs during authorization, two situations can occur.
  • The first is that the client is not authenticated or is not recognized.
  • The authorization server must not redirect the resource owner to the redirect URI.
  • It should inform the resource owner of the error.
  • The second situation is that client is okay, but that some other has occurred
  • If there is the case, the following error response is sent to the client, which is included in the redirect URI:
error Required. Must be one of a set of predefined error codes. See the specification for the codes and their meaning.
error_description Optional. A human-readable UTF-8 encoded text describing the error. Intended for a developer, not an end user.
error_uri Optional. A URI pointing to a human-readable web page with information about the error.
state Required, if present in authorization request. The same value as sent in the state parameter in the request.

Browser-Based Apps - Implicit Grant

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