portal/api/middleware/s5.go

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package middleware
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import (
"context"
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"fmt"
"git.lumeweb.com/LumeWeb/portal/interfaces"
"github.com/golang-jwt/jwt/v5"
"go.sia.tech/jape"
"net/http"
"net/url"
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"strings"
)
const (
S5AuthUserIDKey = "userID"
S5AuthCookieName = "s5-auth-token"
S5AuthQueryParam = "auth_token"
)
func findAuthToken(r *http.Request) string {
authHeader := parseAuthTokenHeader(r.Header)
if authHeader != "" {
return authHeader
}
for _, cookie := range r.Cookies() {
if cookie.Name == S5AuthCookieName {
return cookie.Value
}
}
return r.FormValue(S5AuthQueryParam)
}
func parseAuthTokenHeader(headers http.Header) string {
authHeader := headers.Get("Authorization")
if authHeader == "" {
return ""
}
authHeader = strings.TrimPrefix(authHeader, "Bearer ")
return authHeader
}
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func AuthMiddleware(handler jape.Handler, portal interfaces.Portal) jape.Handler {
return jape.Adapt(func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
authToken := findAuthToken(r)
if authToken == "" {
http.Error(w, "Invalid JWT", http.StatusUnauthorized)
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return
}
token, err := jwt.Parse(authToken, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodEd25519); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
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publicKey := portal.Identity().Public()
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return publicKey, nil
})
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if claim, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
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subject, ok := claim["sub"]
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if !ok {
http.Error(w, "Invalid User ID", http.StatusBadRequest)
return
}
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var userID uint64
switch v := subject.(type) {
case uint64:
userID = v
case float64:
userID = uint64(v)
default:
// Handle the case where userID is of an unexpected type
http.Error(w, "Invalid User ID", http.StatusBadRequest)
return
}
exists, _ := portal.Accounts().AccountExists(userID)
if !exists {
http.Error(w, "Invalid User ID", http.StatusBadRequest)
return
}
ctx := context.WithValue(r.Context(), S5AuthUserIDKey, userID)
r = r.WithContext(ctx)
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h.ServeHTTP(w, r)
} else {
http.Error(w, "Invalid JWT", http.StatusUnauthorized)
}
})
})(handler)
}
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type tusJwtResponseWriter struct {
http.ResponseWriter
req *http.Request
}
func (w *tusJwtResponseWriter) WriteHeader(statusCode int) {
// Check if this is the specific route and status
if statusCode == http.StatusCreated {
location := w.Header().Get("Location")
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authToken := parseAuthTokenHeader(w.req.Header)
if authToken != "" && location != "" {
parsedUrl, _ := url.Parse(location)
query := parsedUrl.Query()
query.Set("auth_token", authToken)
parsedUrl.RawQuery = query.Encode()
w.Header().Set("Location", parsedUrl.String())
}
}
w.ResponseWriter.WriteHeader(statusCode)
}
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func BuildS5TusApi(portal interfaces.Portal) jape.Handler {
// Wrapper function for AuthMiddleware to fit the MiddlewareFunc signature
authMiddlewareFunc := func(h jape.Handler) jape.Handler {
return AuthMiddleware(h, portal)
}
// Create a jape.Handler for your tusHandler
tusJapeHandler := func(c jape.Context) {
tusHandler := portal.Storage().Tus()
tusHandler.ServeHTTP(c.ResponseWriter, c.Request)
}
protocolMiddleware := jape.Adapt(func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := context.WithValue(r.Context(), "protocol", "s5")
h.ServeHTTP(w, r.WithContext(ctx))
})
})
stripPrefix := func(h jape.Handler) jape.Handler {
return jape.Adapt(func(h http.Handler) http.Handler {
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return http.StripPrefix("/s5/upload/tus", h)
})(h)
}
injectJwt := func(h jape.Handler) jape.Handler {
return jape.Adapt(func(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
res := w
if r.Method == http.MethodPost && r.URL.Path == "/s5/upload/tus" {
res = &tusJwtResponseWriter{ResponseWriter: w, req: r}
}
h.ServeHTTP(res, r)
})
})(h)
}
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// Apply the middlewares to the tusJapeHandler
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tusHandler := ApplyMiddlewares(tusJapeHandler, authMiddlewareFunc, injectJwt, protocolMiddleware, stripPrefix)
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return tusHandler
}