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providers.go
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/
providers.go
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package oauth
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strconv"
"golang.org/x/oauth2"
"golang.org/x/oauth2/facebook"
"golang.org/x/oauth2/github"
"golang.org/x/oauth2/google"
)
type provider struct {
config *oauth2.Config
getUser func(*http.Client) (*user, error)
}
type providerConfig struct {
endpoint oauth2.Endpoint
scopes []string
getUser func(*http.Client) (*user, error)
}
type user struct {
id string
name string
}
var providerConfigs = map[string]providerConfig{
"google": {
endpoint: google.Endpoint,
scopes: []string{"profile"},
getUser: getGoogleUser,
},
"facebook": {
endpoint: facebook.Endpoint,
scopes: []string{"public_profile"},
getUser: getFacebookUser,
},
"github": {
endpoint: github.Endpoint,
scopes: []string{},
getUser: getGithubUser,
},
}
func getGoogleUser(c *http.Client) (*user, error) {
url := "https://www.googleapis.com/oauth2/v2/userinfo"
u := struct {
ID string `json:"id"`
Name string `json:"name"`
}{}
err := getJSON(c, url, &u)
if err != nil {
return nil, err
}
return &user{id: u.ID, name: u.Name}, nil
}
func getFacebookUser(c *http.Client) (*user, error) {
url := "https://graph.facebook.com/me?fields=id,name"
u := struct {
ID string `json:"id"`
Name string `json:"name"`
}{}
err := getJSON(c, url, &u)
if err != nil {
return nil, err
}
return &user{id: u.ID, name: u.Name}, nil
}
func getGithubUser(c *http.Client) (*user, error) {
url := "https://api.github.com/user"
u := struct {
ID int64 `json:"id"`
Name string `json:"name"`
}{}
err := getJSON(c, url, &u)
if err != nil {
return nil, err
}
return &user{id: strconv.FormatInt(u.ID, 10), name: u.Name}, nil
}
func getJSON(c *http.Client, url string, v interface{}) error {
response, err := c.Get(url)
if err != nil {
return fmt.Errorf("request failed: %v", err)
}
defer response.Body.Close()
if response.StatusCode < 200 || response.StatusCode > 299 {
return fmt.Errorf("bad request status code: %v", response.StatusCode)
}
err = json.NewDecoder(io.LimitReader(response.Body, 1<<20)).Decode(v)
if err != nil {
return fmt.Errorf("failed to decode JSON response: %v", err)
}
return nil
}