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middleware.go
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middleware.go
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package authcontrol
import (
"errors"
"net/http"
"github.com/go-chi/jwtauth/v5"
"github.com/lestrrat-go/jwx/v2/jwt"
"github.com/0xsequence/authcontrol/proto"
)
type Options struct {
KeyFuncs []KeyFunc
UserStore UserStore
ErrHandler func(r *http.Request, w http.ResponseWriter, err error)
}
func Session(auth *jwtauth.JWTAuth, o *Options) func(next http.Handler) http.Handler {
eh := defaultErrHandler
if o != nil && o.ErrHandler != nil {
eh = o.ErrHandler
}
var keyFuncs []KeyFunc
if o != nil {
keyFuncs = o.KeyFuncs
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// check if the request already contains session, if it does then continue
if _, ok := GetSessionType(ctx); ok {
next.ServeHTTP(w, r)
return
}
var (
sessionType proto.SessionType
accessKey string
token jwt.Token
)
for _, f := range keyFuncs {
if accessKey = f(r); accessKey != "" {
break
}
}
token, err := jwtauth.VerifyRequest(auth, r, jwtauth.TokenFromHeader)
if err != nil {
if errors.Is(err, jwtauth.ErrExpired) {
eh(r, w, proto.ErrSessionExpired)
return
}
if !errors.Is(err, jwtauth.ErrNoTokenFound) {
eh(r, w, proto.ErrUnauthorized)
return
}
}
if token != nil {
claims, err := token.AsMap(ctx)
if err != nil {
eh(r, w, err)
return
}
serviceClaim, _ := claims["service"].(string)
accountClaim, _ := claims["account"].(string)
adminClaim, _ := claims["admin"].(bool)
projectClaim, _ := claims["project"].(float64)
switch {
case serviceClaim != "":
ctx = WithService(ctx, serviceClaim)
sessionType = proto.SessionType_Service
case accountClaim != "":
ctx = withAccount(ctx, accountClaim)
sessionType = proto.SessionType_Wallet
if o != nil && o.UserStore != nil {
user, isAdmin, err := o.UserStore.GetUser(ctx, accountClaim)
if err != nil {
eh(r, w, err)
return
}
if user != nil {
ctx = withUser(ctx, user)
sessionType = proto.SessionType_User
if isAdmin {
sessionType = proto.SessionType_Admin
}
}
}
if adminClaim {
sessionType = proto.SessionType_Admin
}
if projectClaim > 0 {
projectID := uint64(projectClaim)
ctx = withProjectID(ctx, projectID)
sessionType = proto.SessionType_Project
}
}
}
if accessKey != "" && sessionType < proto.SessionType_Admin {
ctx = withAccessKey(ctx, accessKey)
sessionType = max(sessionType, proto.SessionType_AccessKey)
}
ctx = WithSessionType(ctx, sessionType)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}
// AccessControl middleware that checks if the session type is allowed to access the endpoint.
// It also sets the compute units on the context if the endpoint requires it.
func AccessControl(acl Config[ACL], o *Options) func(next http.Handler) http.Handler {
eh := defaultErrHandler
if o != nil && o.ErrHandler != nil {
eh = o.ErrHandler
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
req := newRequest(r.URL.Path)
if req == nil {
eh(r, w, proto.ErrUnauthorized.WithCausef("invalid rpc method"))
return
}
acl, ok := acl.Get(req)
if !ok {
eh(r, w, proto.ErrUnauthorized.WithCausef("rpc method not found"))
return
}
if session, _ := GetSessionType(r.Context()); !acl.Includes(session) {
err := proto.ErrPermissionDenied
if session == proto.SessionType_Public {
err = proto.ErrUnauthorized
}
eh(r, w, err)
return
}
next.ServeHTTP(w, r)
})
}
}