Personal IndieAuth instance https://auth.toby3d.me/
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package http
import (
"crypto/subtle"
"errors"
"path"
"strings"
"github.com/fasthttp/router"
json "github.com/goccy/go-json"
http "github.com/valyala/fasthttp"
"golang.org/x/text/language"
"golang.org/x/text/message"
"source.toby3d.me/toby3d/auth/internal/auth"
"source.toby3d.me/toby3d/auth/internal/client"
"source.toby3d.me/toby3d/auth/internal/common"
"source.toby3d.me/toby3d/auth/internal/domain"
"source.toby3d.me/toby3d/auth/internal/profile"
"source.toby3d.me/toby3d/auth/web"
"source.toby3d.me/toby3d/form"
"source.toby3d.me/toby3d/middleware"
)
type (
AuthAuthorizationRequest struct {
// Indicates to the authorization server that an authorization
// code should be returned as the response.
ResponseType domain.ResponseType `form:"response_type"` // code
// The client URL.
ClientID *domain.ClientID `form:"client_id"`
// The redirect URL indicating where the user should be
// redirected to after approving the request.
RedirectURI *domain.URL `form:"redirect_uri"`
// A parameter set by the client which will be included when the
// user is redirected back to the client. This is used to
// prevent CSRF attacks. The authorization server MUST return
// the unmodified state value back to the client.
State string `form:"state"`
// The code challenge as previously described.
CodeChallenge string `form:"code_challenge"`
// The hashing method used to calculate the code challenge.
CodeChallengeMethod domain.CodeChallengeMethod `form:"code_challenge_method"`
// A space-separated list of scopes the client is requesting,
// e.g. "profile", or "profile create". If the client omits this
// value, the authorization server MUST NOT issue an access
// token for this authorization code. Only the user's profile
// URL may be returned without any scope requested.
Scope domain.Scopes `form:"scope,omitempty"`
// The URL that the user entered.
Me *domain.Me `form:"me"`
}
AuthVerifyRequest struct {
ClientID *domain.ClientID `form:"client_id"`
Me *domain.Me `form:"me"`
RedirectURI *domain.URL `form:"redirect_uri"`
CodeChallengeMethod domain.CodeChallengeMethod `form:"code_challenge_method"`
ResponseType domain.ResponseType `form:"response_type"`
Scope domain.Scopes `form:"scope[],omitempty"`
Authorize string `form:"authorize"`
CodeChallenge string `form:"code_challenge"`
State string `form:"state"`
Provider string `form:"provider"`
}
AuthExchangeRequest struct {
GrantType domain.GrantType `form:"grant_type"` // authorization_code
// The authorization code received from the authorization
// endpoint in the redirect.
Code string `form:"code"`
// The client's URL, which MUST match the client_id used in the
// authentication request.
ClientID *domain.ClientID `form:"client_id"`
// The client's redirect URL, which MUST match the initial
// authentication request.
RedirectURI *domain.URL `form:"redirect_uri"`
// The original plaintext random string generated before
// starting the authorization request.
CodeVerifier string `form:"code_verifier"`
}
AuthExchangeResponse struct {
Me *domain.Me `json:"me"`
Profile *AuthProfileResponse `json:"profile,omitempty"`
}
AuthProfileResponse struct {
Email *domain.Email `json:"email,omitempty"`
Photo *domain.URL `json:"photo,omitempty"`
URL *domain.URL `json:"url,omitempty"`
Name string `json:"name,omitempty"`
}
NewRequestHandlerOptions struct {
Auth auth.UseCase
Clients client.UseCase
Config *domain.Config
Matcher language.Matcher
Profiles profile.UseCase
}
RequestHandler struct {
clients client.UseCase
config *domain.Config
matcher language.Matcher
useCase auth.UseCase
}
)
func NewRequestHandler(opts NewRequestHandlerOptions) *RequestHandler {
return &RequestHandler{
clients: opts.Clients,
config: opts.Config,
matcher: opts.Matcher,
useCase: opts.Auth,
}
}
func (h *RequestHandler) Register(r *router.Router) {
chain := middleware.Chain{
middleware.CSRFWithConfig(middleware.CSRFConfig{
Skipper: func(ctx *http.RequestCtx) bool {
matched, _ := path.Match("/authorize*", string(ctx.Path()))
return ctx.IsPost() && matched
},
CookieMaxAge: 0,
CookieSameSite: http.CookieSameSiteStrictMode,
ContextKey: "csrf",
CookieDomain: h.config.Server.Domain,
CookieName: "__Secure-csrf",
CookiePath: "",
TokenLookup: "param:_csrf",
TokenLength: 0,
CookieSecure: true,
CookieHTTPOnly: true,
}),
middleware.BasicAuthWithConfig(middleware.BasicAuthConfig{
Skipper: func(ctx *http.RequestCtx) bool {
matched, _ := path.Match("/api/*", string(ctx.Path()))
provider := string(ctx.QueryArgs().Peek("provider"))
providerMatched := provider != "" && provider != domain.ProviderDirect.UID
return !ctx.IsPost() || !matched || providerMatched
},
Validator: func(ctx *http.RequestCtx, login, password string) (bool, error) {
userMatch := subtle.ConstantTimeCompare([]byte(login),
[]byte(h.config.IndieAuth.Username))
passMatch := subtle.ConstantTimeCompare([]byte(password),
[]byte(h.config.IndieAuth.Password))
return userMatch == 1 && passMatch == 1, nil
},
Realm: "",
}),
middleware.LogFmt(),
}
r.GET("/authorize", chain.RequestHandler(h.handleAuthorize))
r.POST("/api/authorize", chain.RequestHandler(h.handleVerify))
r.POST("/authorize", chain.RequestHandler(h.handleExchange))
}
func (h *RequestHandler) handleAuthorize(ctx *http.RequestCtx) {
ctx.SetContentType(common.MIMETextHTMLCharsetUTF8)
tags, _, _ := language.ParseAcceptLanguage(string(ctx.Request.Header.Peek(http.HeaderAcceptLanguage)))
tag, _, _ := h.matcher.Match(tags...)
baseOf := web.BaseOf{
Config: h.config,
Language: tag,
Printer: message.NewPrinter(tag),
}
req := NewAuthAuthorizationRequest()
if err := req.bind(ctx); err != nil {
ctx.SetStatusCode(http.StatusBadRequest)
web.WriteTemplate(ctx, &web.ErrorPage{
BaseOf: baseOf,
Error: err,
})
return
}
client, err := h.clients.Discovery(ctx, req.ClientID)
if err != nil {
ctx.SetStatusCode(http.StatusBadRequest)
web.WriteTemplate(ctx, &web.ErrorPage{
BaseOf: baseOf,
Error: err,
})
return
}
if !client.ValidateRedirectURI(req.RedirectURI) {
ctx.SetStatusCode(http.StatusBadRequest)
web.WriteTemplate(ctx, &web.ErrorPage{
BaseOf: baseOf,
Error: domain.NewError(
domain.ErrorCodeInvalidClient,
"requested redirect_uri is not registered on client_id side",
"",
),
})
return
}
csrf, _ := ctx.UserValue(middleware.DefaultCSRFConfig.ContextKey).([]byte)
web.WriteTemplate(ctx, &web.AuthorizePage{
BaseOf: baseOf,
CSRF: csrf,
Scope: req.Scope,
Client: client,
Me: req.Me,
RedirectURI: req.RedirectURI,
CodeChallengeMethod: req.CodeChallengeMethod,
ResponseType: req.ResponseType,
CodeChallenge: req.CodeChallenge,
State: req.State,
Providers: make([]*domain.Provider, 0), // TODO(toby3d)
})
}
func (h *RequestHandler) handleVerify(ctx *http.RequestCtx) {
ctx.Response.Header.Set(http.HeaderAccessControlAllowOrigin, h.config.Server.Domain)
ctx.SetContentType(common.MIMEApplicationJSONCharsetUTF8)
ctx.Request.Header.DelCookie("__Secure-csrf")
encoder := json.NewEncoder(ctx)
req := NewAuthVerifyRequest()
if err := req.bind(ctx); err != nil {
ctx.SetStatusCode(http.StatusBadRequest)
_ = encoder.Encode(err)
return
}
redirectURL := http.AcquireURI()
defer http.ReleaseURI(redirectURL)
req.RedirectURI.CopyTo(redirectURL)
if strings.EqualFold(req.Authorize, "deny") {
domain.NewError(domain.ErrorCodeAccessDenied, "user deny authorization request", "", req.State).
SetReirectURI(redirectURL)
ctx.Redirect(redirectURL.String(), http.StatusFound)
return
}
code, err := h.useCase.Generate(ctx, auth.GenerateOptions{
ClientID: req.ClientID,
Me: req.Me,
RedirectURI: req.RedirectURI,
CodeChallengeMethod: req.CodeChallengeMethod,
Scope: req.Scope,
CodeChallenge: req.CodeChallenge,
})
if err != nil {
ctx.SetStatusCode(http.StatusInternalServerError)
_ = encoder.Encode(err)
return
}
for key, val := range map[string]string{
"code": code,
"iss": h.config.Server.GetRootURL(),
"state": req.State,
} {
redirectURL.QueryArgs().Set(key, val)
}
ctx.Redirect(redirectURL.String(), http.StatusFound)
}
func (h *RequestHandler) handleExchange(ctx *http.RequestCtx) {
ctx.SetContentType(common.MIMEApplicationJSONCharsetUTF8)
encoder := json.NewEncoder(ctx)
req := new(AuthExchangeRequest)
if err := req.bind(ctx); err != nil {
ctx.SetStatusCode(http.StatusBadRequest)
_ = encoder.Encode(err)
return
}
me, profile, err := h.useCase.Exchange(ctx, auth.ExchangeOptions{
Code: req.Code,
ClientID: req.ClientID,
RedirectURI: req.RedirectURI,
CodeVerifier: req.CodeVerifier,
})
if err != nil {
ctx.SetStatusCode(http.StatusBadRequest)
_ = encoder.Encode(err)
return
}
var userInfo *AuthProfileResponse
if profile != nil {
userInfo = &AuthProfileResponse{
Email: profile.GetEmail(),
Photo: profile.GetPhoto(),
URL: profile.GetURL(),
Name: profile.GetName(),
}
}
_ = encoder.Encode(&AuthExchangeResponse{
Me: me,
Profile: userInfo,
})
}
func NewAuthAuthorizationRequest() *AuthAuthorizationRequest {
return &AuthAuthorizationRequest{
ClientID: new(domain.ClientID),
CodeChallenge: "",
CodeChallengeMethod: domain.CodeChallengeMethodUndefined,
Me: new(domain.Me),
RedirectURI: new(domain.URL),
ResponseType: domain.ResponseTypeUndefined,
Scope: make(domain.Scopes, 0),
State: "",
}
}
//nolint: cyclop
func (r *AuthAuthorizationRequest) bind(ctx *http.RequestCtx) error {
indieAuthError := new(domain.Error)
if err := form.Unmarshal(ctx.QueryArgs().QueryString(), r); err != nil {
if errors.As(err, indieAuthError) {
return indieAuthError
}
return domain.NewError(
domain.ErrorCodeInvalidRequest,
err.Error(),
"https://indieauth.net/source/#authorization-request",
)
}
if r.ResponseType == domain.ResponseTypeID {
r.ResponseType = domain.ResponseTypeCode
}
return nil
}
func NewAuthVerifyRequest() *AuthVerifyRequest {
return &AuthVerifyRequest{
Authorize: "",
ClientID: new(domain.ClientID),
CodeChallenge: "",
CodeChallengeMethod: domain.CodeChallengeMethodUndefined,
Me: new(domain.Me),
Provider: "",
RedirectURI: new(domain.URL),
ResponseType: domain.ResponseTypeUndefined,
Scope: make(domain.Scopes, 0),
State: "",
}
}
//nolint: funlen,cyclop
func (r *AuthVerifyRequest) bind(ctx *http.RequestCtx) error {
indieAuthError := new(domain.Error)
if err := form.Unmarshal(ctx.PostArgs().QueryString(), r); err != nil {
if errors.As(err, indieAuthError) {
return indieAuthError
}
return domain.NewError(
domain.ErrorCodeInvalidRequest,
err.Error(),
"https://indieauth.net/source/#authorization-request",
)
}
// NOTE(toby3d): backwards-compatible support.
// See: https://aaronparecki.com/2020/12/03/1/indieauth-2020#response-type
if r.ResponseType == domain.ResponseTypeID {
r.ResponseType = domain.ResponseTypeCode
}
r.Provider = strings.ToLower(r.Provider)
if !strings.EqualFold(r.Authorize, "allow") && !strings.EqualFold(r.Authorize, "deny") {
return domain.NewError(
domain.ErrorCodeInvalidRequest,
"cannot validate verification request",
"https://indieauth.net/source/#authorization-request",
)
}
return nil
}
func (r *AuthExchangeRequest) bind(ctx *http.RequestCtx) error {
indieAuthError := new(domain.Error)
if err := form.Unmarshal(ctx.PostArgs().QueryString(), r); err != nil {
if errors.As(err, indieAuthError) {
return indieAuthError
}
return domain.NewError(
domain.ErrorCodeInvalidRequest,
"cannot validate verification request",
"https://indieauth.net/source/#redeeming-the-authorization-code",
)
}
return nil
}