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Albin Vass
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May 26, 2024
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| Original file line number | Diff line number | Diff line change |
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@@ -12,3 +12,5 @@ devenv.local.nix | |
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| # pre-commit | ||
| .pre-commit-config.yaml | ||
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| .env | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| // platform/authenticator/auth.go | ||
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| package authenticator | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
| "os" | ||
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| "github.com/coreos/go-oidc/v3/oidc" | ||
| "golang.org/x/oauth2" | ||
| ) | ||
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| // Authenticator is used to authenticate our users. | ||
| type Authenticator struct { | ||
| *oidc.Provider | ||
| oauth2.Config | ||
| } | ||
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| // New instantiates the *Authenticator. | ||
| func New() (*Authenticator, error) { | ||
| provider, err := oidc.NewProvider( | ||
| context.Background(), | ||
| "https://"+os.Getenv("AUTH0_DOMAIN")+"/", | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| conf := oauth2.Config{ | ||
| ClientID: os.Getenv("AUTH0_CLIENT_ID"), | ||
| ClientSecret: os.Getenv("AUTH0_CLIENT_SECRET"), | ||
| RedirectURL: os.Getenv("AUTH0_CALLBACK_URL"), | ||
| Endpoint: provider.Endpoint(), | ||
| Scopes: []string{oidc.ScopeOpenID, "profile"}, | ||
| } | ||
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| return &Authenticator{ | ||
| Provider: provider, | ||
| Config: conf, | ||
| }, nil | ||
| } | ||
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| // VerifyIDToken verifies that an *oauth2.Token is a valid *oidc.IDToken. | ||
| func (a *Authenticator) VerifyIDToken(ctx context.Context, token *oauth2.Token) (*oidc.IDToken, error) { | ||
| rawIDToken, ok := token.Extra("id_token").(string) | ||
| if !ok { | ||
| return nil, errors.New("no id_token field in oauth2 token") | ||
| } | ||
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| oidcConfig := &oidc.Config{ | ||
| ClientID: a.ClientID, | ||
| } | ||
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| return a.Verifier(oidcConfig).Verify(ctx, rawIDToken) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // web/app/callback/callback.go | ||
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| package callback | ||
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| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "net/http" | ||
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| "github.com/albinvass/splitfree/splitfree-backend/authenticator" | ||
| "github.com/danielgtaylor/huma/v2" | ||
| "github.com/google/uuid" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
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| type CallbackInput struct { | ||
| Session http.Cookie `cookie:"session"` | ||
| State uuid.UUID `query:"state"` | ||
| Code string `query:"code"` | ||
| } | ||
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| type CallbackOutput struct { | ||
| Status int | ||
| Cookies []http.Cookie `header:"Set-Cookie"` | ||
| Url string `header:"Location"` | ||
| } | ||
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| // Handler for our callback. | ||
| func Handler(auth *authenticator.Authenticator) func(context.Context, *CallbackInput) (*CallbackOutput, error) { | ||
| return func(ctx context.Context, callbackInput *CallbackInput) (*CallbackOutput, error) { | ||
| state, err := uuid.Parse(callbackInput.Session.Value) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if callbackInput.State != state { | ||
| return nil, huma.Error400BadRequest("Invalid state parameter.") | ||
| } | ||
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| // Exchange an authorization code for a token. | ||
| token, err := auth.Exchange(ctx, callbackInput.Code) | ||
| if err != nil { | ||
| return nil, huma.Error401Unauthorized("Failed to exchange an authorization code for a token.") | ||
| } | ||
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| idToken, err := auth.VerifyIDToken(ctx, token) | ||
| if err != nil { | ||
| return nil, huma.Error500InternalServerError("Failed to verify ID Token.") | ||
| } | ||
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| var profile map[string]interface{} | ||
| if err := idToken.Claims(&profile); err != nil { | ||
| return nil, huma.Error500InternalServerError("", err) | ||
| } | ||
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| accessTokenCookie := http.Cookie{ | ||
| Name: "access_token", | ||
| Value: token.AccessToken, | ||
| } | ||
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| profileJson, err := json.Marshal(profile) | ||
| if err != nil { | ||
| return nil, huma.Error500InternalServerError("", err) | ||
| } | ||
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| profileJsonBase64 := base64.StdEncoding.EncodeToString(profileJson) | ||
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| log.Infof("storing cookie: %s", profileJsonBase64) | ||
| profileCookie := http.Cookie{ | ||
| Name: "profile", | ||
| Value: profileJsonBase64, | ||
| } | ||
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| return &CallbackOutput{ | ||
| Status: http.StatusTemporaryRedirect, | ||
| Cookies: []http.Cookie{ | ||
| accessTokenCookie, | ||
| profileCookie, | ||
| }, | ||
| Url: "/user", | ||
| }, nil | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package login | ||
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| import ( | ||
| "context" | ||
| "github.com/albinvass/splitfree/splitfree-backend/authenticator" | ||
| "github.com/google/uuid" | ||
| "golang.org/x/oauth2" | ||
| "net/http" | ||
| "time" | ||
| ) | ||
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| type LoginOutput struct { | ||
| Status int | ||
| Url string `header:"Location"` | ||
| Cookie http.Cookie `header:"Set-Cookie"` | ||
| } | ||
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| func Handler(auth *authenticator.Authenticator) func(context.Context, *struct{}) (*LoginOutput, error) { | ||
| return func(ctx context.Context, _ *struct{}) (*LoginOutput, error) { | ||
| state := uuid.New() | ||
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| url := auth.AuthCodeURL(state.String(), oauth2.AccessTypeOnline) | ||
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| cookie := http.Cookie{ | ||
| Name: "session", | ||
| Value: state.String(), | ||
| Path: "/", | ||
| MaxAge: int(time.Hour.Seconds()), | ||
| Secure: false, | ||
| HttpOnly: true, | ||
| } | ||
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| return &LoginOutput{ | ||
| Status: http.StatusTemporaryRedirect, | ||
| Url: url, | ||
| Cookie: cookie, | ||
| }, nil | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // web/app/logout/logout.go | ||
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| package logout | ||
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| import ( | ||
| "context" | ||
| "github.com/danielgtaylor/huma/v2" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| ) | ||
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| type LogoutInput struct { | ||
| } | ||
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| type LogoutOutput struct { | ||
| Status int | ||
| Url string `header:"Location"` | ||
| } | ||
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| // Handler for our logout. | ||
| func Handler(ctx context.Context, loginInput *LogoutInput) (*LogoutOutput, error) { | ||
| logoutUrl, err := url.Parse("https://" + os.Getenv("AUTH0_DOMAIN") + "/v2/logout") | ||
| if err != nil { | ||
| return nil, huma.Error500InternalServerError("", err) | ||
| } | ||
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| canonicalUrl := os.Getenv("SPLITFREE_CANONICAL_URL") | ||
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| returnTo, err := url.Parse(canonicalUrl) | ||
| if err != nil { | ||
| return nil, huma.Error500InternalServerError("", err) | ||
| } | ||
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| parameters := url.Values{} | ||
| parameters.Add("returnTo", returnTo.String()) | ||
| parameters.Add("client_id", os.Getenv("AUTH0_CLIENT_ID")) | ||
| logoutUrl.RawQuery = parameters.Encode() | ||
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| return &LogoutOutput{ | ||
| Status: http.StatusTemporaryRedirect, | ||
| Url: logoutUrl.String(), | ||
| }, nil | ||
| } |
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