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package provider
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
)
type Google struct {
ClientId string `long:"providers.google.client-id" description:"Client ID"`
ClientSecret string `long:"providers.google.client-secret" description:"Client Secret" json:"-"`
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Scope string
Prompt string `long:"providers.google.prompt" description:"Space separated list of OpenID prompt options"`
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LoginURL *url.URL
TokenURL *url.URL
UserURL *url.URL
}
func (g *Google) Build() {
g.LoginURL = &url.URL{
Scheme: "https",
Host: "accounts.google.com",
Path: "/o/oauth2/auth",
}
g.TokenURL = &url.URL{
Scheme: "https",
Host: "www.googleapis.com",
Path: "/oauth2/v3/token",
}
g.UserURL = &url.URL{
Scheme: "https",
Host: "www.googleapis.com",
Path: "/oauth2/v2/userinfo",
}
}
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func (g *Google) GetLoginURL(redirectUri, state string) string {
q := url.Values{}
q.Set("client_id", g.ClientId)
q.Set("response_type", "code")
q.Set("scope", g.Scope)
if g.Prompt != "" {
q.Set("prompt", g.Prompt)
}
q.Set("redirect_uri", redirectUri)
q.Set("state", state)
var u url.URL
u = *g.LoginURL
u.RawQuery = q.Encode()
return u.String()
}
func (g *Google) ExchangeCode(redirectUri, code string) (string, error) {
form := url.Values{}
form.Set("client_id", g.ClientId)
form.Set("client_secret", g.ClientSecret)
form.Set("grant_type", "authorization_code")
form.Set("redirect_uri", redirectUri)
form.Set("code", code)
res, err := http.PostForm(g.TokenURL.String(), form)
if err != nil {
return "", err
}
var token Token
defer res.Body.Close()
err = json.NewDecoder(res.Body).Decode(&token)
return token.Token, err
}
func (g *Google) GetUser(token string) (User, error) {
var user User
client := &http.Client{}
req, err := http.NewRequest("GET", g.UserURL.String(), nil)
if err != nil {
return user, err
}
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
res, err := client.Do(req)
if err != nil {
return user, err
}
defer res.Body.Close()
err = json.NewDecoder(res.Body).Decode(&user)
return user, err
}