class OAuth2::Client


An OAuth2 client.

For a quick example of how to authenticate an HTTP::Client with OAuth2 if you already have an access token, check the OAuth2 module description.

This class also provides methods to build authorize URIs and get access tokens with different methods, as specified by RFC 6749.


require "oauth2"

client_id = "some_client_id"
client_secret = "some_client_secret"
redirect_uri = "http://some.callback"

# Create oauth client, optionally pass custom URIs if needed,
# if the authorize or token URIs are not the standard ones
# (they can also be absolute URLs)
oauth2_client ="", client_id, client_secret,
  redirect_uri: redirect_uri)

# Build an authorize URI
authorize_uri = oauth2_client.get_authorize_uri

# Redirect the user to `authorize_uri`...
# ...
# When http://some.callback is hit, once the user authorized the access,
# we resume our logic to finally get an access token. The callback URL
# should receive an `authorization_code` parameter that we need to use.
authorization_code = request.params["code"]

# Get the access token
access_token = oauth2_client.get_access_token_using_authorization_code(authorization_code)

# Probably save the access token for reuse... This can be done
# with `to_json` and `from_json`.

# Use the token to authenticate an HTTP::Client
client ="", tls: true)

# And do requests as usual
client.get "/some_path"

# If the token expires, we can refresh it
new_access_token = oauth2_client.get_access_token_using_refresh_token(access_token.refresh_token)

You can also use an OAuth2::Session to automatically refresh expired tokens before each request.

Defined in:


Constant Summary

DEFAULT_HEADERS = HTTP::Headers {"Accept" => "application/json", "Content-Type" => "application/x-www-form-urlencoded"}


Instance Method Summary

Instance methods inherited from class Reference

==(other : self)
==(other : JSON::Any)
==(other : YAML::Any)
, dup dup, hash(hasher) hash, initialize initialize, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference) : Bool
same?(other : Nil)
, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new, unsafe_construct(address : Pointer, *args, **opts) : self unsafe_construct

Class methods inherited from class Reference

pre_initialize(address : Pointer) pre_initialize

Instance methods inherited from class Object

! : Bool !, !=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash(hasher)
, in?(collection : Object) : Bool
in?(*values : Object) : Bool
, inspect(io : IO) : Nil
inspect : String
, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil!(message)
, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO) : Nil
to_json : String
, to_pretty_json(indent : String = " ") : String
to_pretty_json(io : IO, indent : String = " ") : Nil
, to_s(io : IO) : Nil
to_s : String
, to_yaml(io : IO) : Nil
to_yaml : String
, try(&) try, unsafe_as(type : T.class) forall T unsafe_as

Class methods inherited from class Object

from_json(string_or_io, root : String)
, from_yaml(string_or_io : String | IO) from_yaml

Macros inherited from class Object

class_getter(*names, &block) class_getter, class_getter!(*names) class_getter!, class_getter?(*names, &block) class_getter?, class_property(*names, &block) class_property, class_property!(*names) class_property!, class_property?(*names, &block) class_property?, class_setter(*names) class_setter, def_clone def_clone, def_equals(*fields) def_equals, def_equals_and_hash(*fields) def_equals_and_hash, def_hash(*fields) def_hash, delegate(*methods, to object) delegate, forward_missing_to(delegate) forward_missing_to, getter(*names, &block) getter, getter!(*names) getter!, getter?(*names, &block) getter?, property(*names, &block) property, property!(*names) property!, property?(*names, &block) property?, setter(*names) setter

Constructor Detail

def : String, client_id : String, client_secret : String, port : Int32 | Nil = nil, scheme : String = "https", authorize_uri : String = "/oauth2/authorize", token_uri : String = "/oauth2/token", redirect_uri : String | Nil = nil, auth_scheme : AuthScheme = :http_basic) #

Creates an OAuth client.

Any or all of the customizable URIs authorize_uri and token_uri can be relative or absolute. If they are relative, the given host, port and scheme will be used. If they are absolute, the absolute URL will be used.

As per, AuthScheme::HTTPBasic is the default auth_scheme (the mechanism used to transmit the client credentials to the server). AuthScheme::RequestBody should only be used if the server does not support HTTP Basic.

[View source]

Instance Method Detail

def get_access_token_using_authorization_code(authorization_code : String) : AccessToken #

Gets an access token using an authorization code, as specified by RFC 6749, Section 4.1.3.

[View source]
def get_access_token_using_client_credentials(scope = nil) : AccessToken #

Gets an access token using client credentials, as specified by RFC 6749, Section 4.4.2.

[View source]
def get_access_token_using_refresh_token(refresh_token, scope = nil) : AccessToken #

Gets an access token using a refresh token, as specified by RFC 6749, Section 6.

[View source]
def get_access_token_using_resource_owner_credentials(username : String, password : String, scope = nil) : AccessToken #

Gets an access token using the resource owner credentials, as specified by RFC 6749, Section 4.3.2.

[View source]
def get_authorize_uri(scope = nil, state = nil) : String #

Builds an authorize URI, as specified by RFC 6749, Section 4.1.1.

[View source]
def get_authorize_uri(scope = nil, state = nil, &block : URI::Params::Builder -> ) : String #

Builds an authorize URI, as specified by RFC 6749, Section 4.1.1.

Yields an URI::Params::Builder to add extra parameters other than those defined by the standard.

[View source]
def http_client : HTTP::Client #

Returns the HTTP::Client to use with this client.

By default, this returns a new instance every time. To reuse the same instance, one can be assigned with #http_client=.

[View source]
def http_client=(http_client : HTTP::Client | Nil) #

Sets the HTTP::Client to use with this client.

[View source]
def make_token_request(&block : URI::Params::Builder, HTTP::Headers -> _) : HTTP::Client::Response #

Makes a token exchange request with custom headers and form fields

[View source]
def redirect_uri : String | Nil #

Gets the redirect_uri

[View source]