mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-06-02 21:39:25 +00:00
586 lines
15 KiB
Go
586 lines
15 KiB
Go
package server
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/superseriousbusiness/oauth2/v4"
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"github.com/superseriousbusiness/oauth2/v4/errors"
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)
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// NewDefaultServer create a default authorization server
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func NewDefaultServer(manager oauth2.Manager) *Server {
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return NewServer(NewConfig(), manager)
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}
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// NewServer create authorization server
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func NewServer(cfg *Config, manager oauth2.Manager) *Server {
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srv := &Server{
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Config: cfg,
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Manager: manager,
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}
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// default handler
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srv.ClientInfoHandler = ClientBasicHandler
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srv.UserAuthorizationHandler = func(w http.ResponseWriter, r *http.Request) (string, error) {
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return "", errors.ErrAccessDenied
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}
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srv.PasswordAuthorizationHandler = func(username, password string) (string, error) {
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return "", errors.ErrAccessDenied
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}
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return srv
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}
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// Server Provide authorization server
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type Server struct {
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Config *Config
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Manager oauth2.Manager
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ClientInfoHandler ClientInfoHandler
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ClientAuthorizedHandler ClientAuthorizedHandler
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ClientScopeHandler ClientScopeHandler
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UserAuthorizationHandler UserAuthorizationHandler
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PasswordAuthorizationHandler PasswordAuthorizationHandler
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RefreshingValidationHandler RefreshingValidationHandler
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RefreshingScopeHandler RefreshingScopeHandler
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ResponseErrorHandler ResponseErrorHandler
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InternalErrorHandler InternalErrorHandler
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ExtensionFieldsHandler ExtensionFieldsHandler
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AccessTokenExpHandler AccessTokenExpHandler
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AuthorizeScopeHandler AuthorizeScopeHandler
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}
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func (s *Server) redirectError(w http.ResponseWriter, req *AuthorizeRequest, err error) error {
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if req == nil {
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return err
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}
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data, _, _ := s.GetErrorData(err)
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return s.redirect(w, req, data)
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}
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func (s *Server) redirect(w http.ResponseWriter, req *AuthorizeRequest, data map[string]interface{}) error {
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uri, err := s.GetRedirectURI(req, data)
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if err != nil {
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return err
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}
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w.Header().Set("Location", uri)
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w.WriteHeader(302)
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return nil
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}
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func (s *Server) tokenError(w http.ResponseWriter, err error) error {
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data, statusCode, header := s.GetErrorData(err)
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return s.token(w, data, header, statusCode)
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}
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func (s *Server) token(w http.ResponseWriter, data map[string]interface{}, header http.Header, statusCode ...int) error {
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w.Header().Set("Content-Type", "application/json;charset=UTF-8")
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w.Header().Set("Cache-Control", "no-store")
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w.Header().Set("Pragma", "no-cache")
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for key := range header {
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w.Header().Set(key, header.Get(key))
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}
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status := http.StatusOK
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if len(statusCode) > 0 && statusCode[0] > 0 {
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status = statusCode[0]
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}
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w.WriteHeader(status)
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return json.NewEncoder(w).Encode(data)
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}
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// GetRedirectURI get redirect uri
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func (s *Server) GetRedirectURI(req *AuthorizeRequest, data map[string]interface{}) (string, error) {
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u, err := url.Parse(req.RedirectURI)
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if err != nil {
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return "", err
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}
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q := u.Query()
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if req.State != "" {
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q.Set("state", req.State)
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}
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for k, v := range data {
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q.Set(k, fmt.Sprint(v))
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}
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switch req.ResponseType {
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case oauth2.Code:
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u.RawQuery = q.Encode()
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case oauth2.Token:
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u.RawQuery = ""
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fragment, err := url.QueryUnescape(q.Encode())
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if err != nil {
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return "", err
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}
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u.Fragment = fragment
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}
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return u.String(), nil
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}
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// CheckResponseType check allows response type
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func (s *Server) CheckResponseType(rt oauth2.ResponseType) bool {
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for _, art := range s.Config.AllowedResponseTypes {
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if art == rt {
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return true
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}
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}
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return false
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}
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// CheckCodeChallengeMethod checks for allowed code challenge method
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func (s *Server) CheckCodeChallengeMethod(ccm oauth2.CodeChallengeMethod) bool {
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for _, c := range s.Config.AllowedCodeChallengeMethods {
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if c == ccm {
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return true
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}
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}
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return false
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}
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// ValidationAuthorizeRequest the authorization request validation
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func (s *Server) ValidationAuthorizeRequest(r *http.Request) (*AuthorizeRequest, error) {
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redirectURI := r.FormValue("redirect_uri")
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clientID := r.FormValue("client_id")
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if !(r.Method == "GET" || r.Method == "POST") ||
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clientID == "" {
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return nil, errors.ErrInvalidRequest
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}
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resType := oauth2.ResponseType(r.FormValue("response_type"))
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if resType.String() == "" {
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return nil, errors.ErrUnsupportedResponseType
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} else if allowed := s.CheckResponseType(resType); !allowed {
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return nil, errors.ErrUnauthorizedClient
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}
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cc := r.FormValue("code_challenge")
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if cc == "" && s.Config.ForcePKCE {
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return nil, errors.ErrCodeChallengeRquired
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}
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if cc != "" && (len(cc) < 43 || len(cc) > 128) {
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return nil, errors.ErrInvalidCodeChallengeLen
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}
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ccm := oauth2.CodeChallengeMethod(r.FormValue("code_challenge_method"))
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// set default
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if ccm == "" {
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ccm = oauth2.CodeChallengePlain
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}
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if ccm.String() != "" && !s.CheckCodeChallengeMethod(ccm) {
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return nil, errors.ErrUnsupportedCodeChallengeMethod
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}
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req := &AuthorizeRequest{
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RedirectURI: redirectURI,
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ResponseType: resType,
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ClientID: clientID,
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State: r.FormValue("state"),
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Scope: r.FormValue("scope"),
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Request: r,
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CodeChallenge: cc,
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CodeChallengeMethod: ccm,
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}
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return req, nil
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}
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// GetAuthorizeToken get authorization token(code)
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func (s *Server) GetAuthorizeToken(ctx context.Context, req *AuthorizeRequest) (oauth2.TokenInfo, error) {
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// check the client allows the grant type
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if fn := s.ClientAuthorizedHandler; fn != nil {
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gt := oauth2.AuthorizationCode
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if req.ResponseType == oauth2.Token {
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gt = oauth2.Implicit
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}
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allowed, err := fn(req.ClientID, gt)
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrUnauthorizedClient
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}
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}
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tgr := &oauth2.TokenGenerateRequest{
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ClientID: req.ClientID,
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UserID: req.UserID,
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RedirectURI: req.RedirectURI,
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Scope: req.Scope,
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AccessTokenExp: req.AccessTokenExp,
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Request: req.Request,
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}
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// check the client allows the authorized scope
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if fn := s.ClientScopeHandler; fn != nil {
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allowed, err := fn(tgr)
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrInvalidScope
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}
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}
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tgr.CodeChallenge = req.CodeChallenge
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tgr.CodeChallengeMethod = req.CodeChallengeMethod
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return s.Manager.GenerateAuthToken(ctx, req.ResponseType, tgr)
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}
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// GetAuthorizeData get authorization response data
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func (s *Server) GetAuthorizeData(rt oauth2.ResponseType, ti oauth2.TokenInfo) map[string]interface{} {
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if rt == oauth2.Code {
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return map[string]interface{}{
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"code": ti.GetCode(),
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}
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}
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return s.GetTokenData(ti)
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}
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// HandleAuthorizeRequest the authorization request handling
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func (s *Server) HandleAuthorizeRequest(w http.ResponseWriter, r *http.Request) error {
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ctx := r.Context()
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req, err := s.ValidationAuthorizeRequest(r)
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if err != nil {
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return s.redirectError(w, req, err)
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}
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// user authorization
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userID, err := s.UserAuthorizationHandler(w, r)
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if err != nil {
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return s.redirectError(w, req, err)
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} else if userID == "" {
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return nil
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}
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req.UserID = userID
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// specify the scope of authorization
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if fn := s.AuthorizeScopeHandler; fn != nil {
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scope, err := fn(w, r)
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if err != nil {
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return err
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} else if scope != "" {
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req.Scope = scope
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}
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}
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// specify the expiration time of access token
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if fn := s.AccessTokenExpHandler; fn != nil {
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exp, err := fn(w, r)
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if err != nil {
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return err
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}
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req.AccessTokenExp = exp
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}
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ti, err := s.GetAuthorizeToken(ctx, req)
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if err != nil {
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return s.redirectError(w, req, err)
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}
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// If the redirect URI is empty, the default domain provided by the client is used.
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if req.RedirectURI == "" {
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client, err := s.Manager.GetClient(ctx, req.ClientID)
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if err != nil {
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return err
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}
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req.RedirectURI = client.GetDomain()
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}
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return s.redirect(w, req, s.GetAuthorizeData(req.ResponseType, ti))
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}
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// ValidationTokenRequest the token request validation
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func (s *Server) ValidationTokenRequest(r *http.Request) (oauth2.GrantType, *oauth2.TokenGenerateRequest, error) {
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if v := r.Method; !(v == "POST" ||
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(s.Config.AllowGetAccessRequest && v == "GET")) {
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return "", nil, errors.ErrInvalidRequest
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}
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gt := oauth2.GrantType(r.FormValue("grant_type"))
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if gt.String() == "" {
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return "", nil, errors.ErrUnsupportedGrantType
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}
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clientID, clientSecret, err := s.ClientInfoHandler(r)
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if err != nil {
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return "", nil, err
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}
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tgr := &oauth2.TokenGenerateRequest{
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ClientID: clientID,
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ClientSecret: clientSecret,
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Request: r,
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}
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switch gt {
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case oauth2.AuthorizationCode:
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tgr.RedirectURI = r.FormValue("redirect_uri")
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tgr.Code = r.FormValue("code")
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if tgr.RedirectURI == "" ||
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tgr.Code == "" {
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return "", nil, errors.ErrInvalidRequest
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}
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tgr.CodeVerifier = r.FormValue("code_verifier")
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if s.Config.ForcePKCE && tgr.CodeVerifier == "" {
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return "", nil, errors.ErrInvalidRequest
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}
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case oauth2.PasswordCredentials:
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tgr.Scope = r.FormValue("scope")
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username, password := r.FormValue("username"), r.FormValue("password")
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if username == "" || password == "" {
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return "", nil, errors.ErrInvalidRequest
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}
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userID, err := s.PasswordAuthorizationHandler(username, password)
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if err != nil {
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return "", nil, err
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} else if userID == "" {
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return "", nil, errors.ErrInvalidGrant
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}
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tgr.UserID = userID
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case oauth2.ClientCredentials:
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tgr.Scope = r.FormValue("scope")
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tgr.RedirectURI = r.FormValue("redirect_uri")
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case oauth2.Refreshing:
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tgr.Refresh = r.FormValue("refresh_token")
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tgr.Scope = r.FormValue("scope")
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if tgr.Refresh == "" {
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return "", nil, errors.ErrInvalidRequest
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}
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}
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return gt, tgr, nil
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}
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// CheckGrantType check allows grant type
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func (s *Server) CheckGrantType(gt oauth2.GrantType) bool {
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for _, agt := range s.Config.AllowedGrantTypes {
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if agt == gt {
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return true
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}
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}
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return false
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}
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// GetAccessToken access token
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func (s *Server) GetAccessToken(ctx context.Context, gt oauth2.GrantType, tgr *oauth2.TokenGenerateRequest) (oauth2.TokenInfo,
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error) {
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if allowed := s.CheckGrantType(gt); !allowed {
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return nil, errors.ErrUnauthorizedClient
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}
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if fn := s.ClientAuthorizedHandler; fn != nil {
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allowed, err := fn(tgr.ClientID, gt)
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrUnauthorizedClient
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}
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}
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switch gt {
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case oauth2.AuthorizationCode:
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ti, err := s.Manager.GenerateAccessToken(ctx, gt, tgr)
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if err != nil {
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switch err {
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case errors.ErrInvalidAuthorizeCode, errors.ErrInvalidCodeChallenge, errors.ErrMissingCodeChallenge:
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return nil, errors.ErrInvalidGrant
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case errors.ErrInvalidClient:
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return nil, errors.ErrInvalidClient
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default:
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return nil, err
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}
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}
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return ti, nil
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case oauth2.PasswordCredentials, oauth2.ClientCredentials:
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if fn := s.ClientScopeHandler; fn != nil {
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allowed, err := fn(tgr)
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrInvalidScope
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}
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}
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return s.Manager.GenerateAccessToken(ctx, gt, tgr)
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case oauth2.Refreshing:
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// check scope
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if scopeFn := s.RefreshingScopeHandler; tgr.Scope != "" && scopeFn != nil {
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rti, err := s.Manager.LoadRefreshToken(ctx, tgr.Refresh)
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if err != nil {
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if err == errors.ErrInvalidRefreshToken || err == errors.ErrExpiredRefreshToken {
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return nil, errors.ErrInvalidGrant
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}
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return nil, err
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}
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allowed, err := scopeFn(tgr, rti.GetScope())
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrInvalidScope
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}
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}
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if validationFn := s.RefreshingValidationHandler; validationFn != nil {
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rti, err := s.Manager.LoadRefreshToken(ctx, tgr.Refresh)
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if err != nil {
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if err == errors.ErrInvalidRefreshToken || err == errors.ErrExpiredRefreshToken {
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return nil, errors.ErrInvalidGrant
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}
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return nil, err
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}
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allowed, err := validationFn(rti)
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if err != nil {
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return nil, err
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} else if !allowed {
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return nil, errors.ErrInvalidScope
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}
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}
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ti, err := s.Manager.RefreshAccessToken(ctx, tgr)
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if err != nil {
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if err == errors.ErrInvalidRefreshToken || err == errors.ErrExpiredRefreshToken {
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return nil, errors.ErrInvalidGrant
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}
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return nil, err
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}
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return ti, nil
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}
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return nil, errors.ErrUnsupportedGrantType
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}
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// GetTokenData token data
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func (s *Server) GetTokenData(ti oauth2.TokenInfo) map[string]interface{} {
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data := map[string]interface{}{
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"access_token": ti.GetAccess(),
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"token_type": s.Config.TokenType,
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"expires_in": int64(ti.GetAccessExpiresIn() / time.Second),
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}
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if scope := ti.GetScope(); scope != "" {
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data["scope"] = scope
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}
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if refresh := ti.GetRefresh(); refresh != "" {
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data["refresh_token"] = refresh
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}
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if fn := s.ExtensionFieldsHandler; fn != nil {
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ext := fn(ti)
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for k, v := range ext {
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if _, ok := data[k]; ok {
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continue
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}
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data[k] = v
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}
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}
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return data
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}
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// HandleTokenRequest token request handling
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func (s *Server) HandleTokenRequest(w http.ResponseWriter, r *http.Request) error {
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ctx := r.Context()
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gt, tgr, err := s.ValidationTokenRequest(r)
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if err != nil {
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return s.tokenError(w, err)
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}
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ti, err := s.GetAccessToken(ctx, gt, tgr)
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if err != nil {
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return s.tokenError(w, err)
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}
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return s.token(w, s.GetTokenData(ti), nil)
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}
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// GetErrorData get error response data
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func (s *Server) GetErrorData(err error) (map[string]interface{}, int, http.Header) {
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var re errors.Response
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if v, ok := errors.Descriptions[err]; ok {
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re.Error = err
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re.Description = v
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re.StatusCode = errors.StatusCodes[err]
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} else {
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if fn := s.InternalErrorHandler; fn != nil {
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if v := fn(err); v != nil {
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re = *v
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}
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}
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if re.Error == nil {
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re.Error = errors.ErrServerError
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re.Description = errors.Descriptions[errors.ErrServerError]
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re.StatusCode = errors.StatusCodes[errors.ErrServerError]
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}
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}
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if fn := s.ResponseErrorHandler; fn != nil {
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fn(&re)
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}
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data := make(map[string]interface{})
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if err := re.Error; err != nil {
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data["error"] = err.Error()
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}
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if v := re.ErrorCode; v != 0 {
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data["error_code"] = v
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}
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if v := re.Description; v != "" {
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data["error_description"] = v
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}
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if v := re.URI; v != "" {
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data["error_uri"] = v
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}
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statusCode := http.StatusInternalServerError
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if v := re.StatusCode; v > 0 {
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statusCode = v
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}
|
|
|
|
return data, statusCode, re.Header
|
|
}
|
|
|
|
// BearerAuth parse bearer token
|
|
func (s *Server) BearerAuth(r *http.Request) (string, bool) {
|
|
auth := r.Header.Get("Authorization")
|
|
prefix := "Bearer "
|
|
token := ""
|
|
|
|
if auth != "" && strings.HasPrefix(auth, prefix) {
|
|
token = auth[len(prefix):]
|
|
} else {
|
|
token = r.FormValue("access_token")
|
|
}
|
|
|
|
return token, token != ""
|
|
}
|
|
|
|
// ValidationBearerToken validation the bearer tokens
|
|
// https://tools.ietf.org/html/rfc6750
|
|
func (s *Server) ValidationBearerToken(r *http.Request) (oauth2.TokenInfo, error) {
|
|
ctx := r.Context()
|
|
|
|
accessToken, ok := s.BearerAuth(r)
|
|
if !ok {
|
|
return nil, errors.ErrInvalidAccessToken
|
|
}
|
|
|
|
return s.Manager.LoadAccessToken(ctx, accessToken)
|
|
}
|