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Go言語のgoauth2を準公式のoauth2に変更

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Go言語でOAuth2を使うためのライブラリ goauth2 が deprecated になっていて、準公式の oauth2 に変更したときのメモ。

JWTを使った認証を例にしています。

import

変更前

import "code.google.com/p/goauth2/oauth/jwt"

変更後

import "golang.org/x/net/context"
import "golang.org/x/oauth2/jwt"

context.Context が必要になる。

http.Client 取得

変更前

token := jwt.NewToken(email, scope, pem)
transport, err := jwt.NewTransport(token)
if err != nil {
	return err
}
client := transport.Client()

変更後

cfg := jwt.Config{
	Email:      email,
	PrivateKey: pem,
	Scopes:     []string{scope},
	TokenURL:   tokenURL,
}
ctx := context.Background()
client := cfg.Client(ctx)

TokenURLは、Googleならhttps://accounts.google.com/o/oauth2/token

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