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GitHub OAuth Login w/ gin
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>weboauth</title> | |
| </head> | |
| <body> | |
| <h1>weboauth</h1> | |
| {{ if .logged_in }} | |
| Logged in: {{ .login }} ({{ .name }}) | |
| {{ else }} | |
| <a href="/signin">Sign in with GitHub</a> | |
| {{ end }} | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "crypto/rand" | |
| "encoding/base64" | |
| "fmt" | |
| "io" | |
| "net/http" | |
| "os" | |
| "strings" | |
| "github.com/gin-gonic/contrib/sessions" | |
| "github.com/gin-gonic/gin" | |
| "github.com/google/go-github/github" | |
| "golang.org/x/oauth2" | |
| githuboauth "golang.org/x/oauth2/github" | |
| ) | |
| func generateSecretKey() (string, error) { | |
| b := make([]byte, 32) | |
| _, err := io.ReadFull(rand.Reader, b) | |
| if err != nil { | |
| fmt.Println("error:", err) | |
| return "", err | |
| } | |
| return strings.TrimRight(base64.StdEncoding.EncodeToString(b), "="), nil | |
| } | |
| func main() { | |
| oauthConf := &oauth2.Config{ | |
| ClientID: os.Getenv("GITHUB_CLIENT_ID"), | |
| ClientSecret: os.Getenv("GITHUB_CLIENT_SECRET"), | |
| Scopes: []string{"user"}, | |
| Endpoint: githuboauth.Endpoint, | |
| } | |
| secretKey := os.Getenv("SECRET_KEY_BASE") | |
| if secretKey == "" { | |
| sk, err := generateSecretKey() | |
| if err != nil { | |
| fmt.Fprintln(os.Stderr, err) | |
| os.Exit(1) | |
| } | |
| secretKey = sk | |
| } | |
| r := gin.Default() | |
| store := sessions.NewCookieStore([]byte(secretKey)) | |
| r.Use(sessions.Sessions("paus", store)) | |
| r.LoadHTMLGlob("templates/*") | |
| r.GET("/", func(c *gin.Context) { | |
| session := sessions.Default(c) | |
| token := session.Get("token") | |
| if token == nil { | |
| c.HTML(http.StatusOK, "index.tmpl", gin.H{ | |
| "logged_in": false, | |
| }) | |
| } else { | |
| oauthClient := oauthConf.Client(oauth2.NoContext, &oauth2.Token{AccessToken: token.(string)}) | |
| client := github.NewClient(oauthClient) | |
| user, _, err := client.Users.Get("") | |
| if err != nil { | |
| c.String(http.StatusNotFound, "User not found") | |
| return | |
| } | |
| c.HTML(http.StatusOK, "index.tmpl", gin.H{ | |
| "logged_in": true, | |
| "login": user.Login, | |
| "name": user.Name, | |
| }) | |
| } | |
| }) | |
| r.GET("/signin", func(c *gin.Context) { | |
| url := oauthConf.AuthCodeURL("hoge", oauth2.AccessTypeOnline) | |
| c.Redirect(http.StatusMovedPermanently, url) | |
| }) | |
| r.GET("/callback", func(c *gin.Context) { | |
| code := c.Query("code") | |
| token, err := oauthConf.Exchange(oauth2.NoContext, code) | |
| if err != nil { | |
| c.String(http.StatusBadRequest, "Error: %s", err) | |
| return | |
| } | |
| session := sessions.Default(c) | |
| fmt.Println(token.AccessToken) | |
| session.Set("token", token.AccessToken) | |
| session.Save() | |
| c.Redirect(http.StatusMovedPermanently, "/") | |
| }) | |
| r.Run() | |
| } |
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