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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // Package auth defines the authentication layer of the application. | ||
| package oauth | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "net/url" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/Darkness4/auth-htmx/jwt" | ||
| "github.com/gorilla/csrf" | ||
| "github.com/rs/zerolog/log" | ||
| ) | ||
|
|
||
| // OAuth is a service that provides HTTP handlers and middlewares used for authentication. | ||
| type OAuth struct { | ||
| JWTSecret jwt.Secret | ||
| Providers map[string]Provider | ||
| } | ||
|
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| // Login is the handler that redirect to the authentication page of the OAuth Provider. | ||
| func (a *OAuth) Login() http.HandlerFunc { | ||
| return func(w http.ResponseWriter, r *http.Request) { | ||
| val, err := url.ParseQuery(r.URL.RawQuery) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| p := val.Get("provider") | ||
|
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| provider, ok := a.Providers[strings.ToLower(p)] | ||
| if !ok { | ||
| http.Error(w, "auth provider not known", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
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| token := csrf.Token(r) | ||
| cookie := &http.Cookie{ | ||
| Name: "csrf_token", | ||
| Value: token, | ||
| Expires: time.Now().Add(1 * time.Minute), // Set expiration time as needed | ||
| HttpOnly: true, | ||
| } | ||
| // State contain the provider and the csrf token. | ||
| state := fmt.Sprintf("%s,%s", token, p) | ||
| http.SetCookie(w, cookie) | ||
| http.Redirect( | ||
| w, | ||
| r, | ||
| provider.AuthCodeURL(state), | ||
| http.StatusFound, | ||
| ) | ||
| } | ||
| } | ||
|
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| // CallBack is the handler called after login. | ||
| // | ||
| // It: | ||
| // | ||
| // 1. Fetches the accessToken | ||
| // 2. Fetches some user info and wrap them in a JWT token | ||
| // 3. Store the JWT token in a cookie for the browser. | ||
| func (a *OAuth) CallBack() http.HandlerFunc { | ||
| return func(w http.ResponseWriter, r *http.Request) { | ||
| val, err := url.ParseQuery(r.URL.RawQuery) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| code := val.Get("code") | ||
| csrfToken, p, ok := strings.Cut(val.Get("state"), ",") | ||
| if !ok { | ||
| log.Error().Msg(fmt.Sprintf("invalid state: %s", val.Get("state"))) | ||
| http.Error( | ||
| w, | ||
| fmt.Sprintf("invalid state: %s", val.Get("state")), | ||
| http.StatusInternalServerError, | ||
| ) | ||
| return | ||
| } | ||
|
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| expectedCSRF, err := r.Cookie("csrf_token") | ||
| if err == http.ErrNoCookie { | ||
| http.Error(w, "no csrf cookie error", http.StatusUnauthorized) | ||
| return | ||
| } | ||
| if csrfToken != expectedCSRF.Value { | ||
| http.Error(w, "csrf error", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
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||
| provider, ok := a.Providers[strings.ToLower(p)] | ||
| if !ok { | ||
| http.Error(w, "auth provider not known", http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
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||
| oauth2Token, err := provider.Exchange(r.Context(), code) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
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| userID, userName, err := provider.GetIdentity(r.Context(), oauth2Token) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusUnauthorized) | ||
| return | ||
| } | ||
|
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| token, err := a.JWTSecret.GenerateToken(userID, userName, strings.ToLower(p)) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
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| cookie := &http.Cookie{ | ||
| Name: jwt.TokenCookieKey, | ||
| Value: token, | ||
| Path: "/", | ||
| Expires: time.Now().Add(jwt.ExpiresDuration), | ||
| HttpOnly: true, | ||
| } | ||
| http.SetCookie(w, cookie) | ||
| http.Redirect(w, r, "/", http.StatusFound) | ||
| } | ||
| } |
2 changes: 1 addition & 1 deletion
2
auth/auth_github_provider.go → auth/oauth/oauth_github_provider.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| package auth | ||
| package oauth | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| package auth | ||
| package oauth | ||
|
|
||
| import ( | ||
| "context" | ||
|
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||
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