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middleware.go
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middleware.go
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package middleware
import (
"context"
"errors"
"net/http"
"strings"
"github.com/ViBiOh/auth/v2/pkg/auth"
"github.com/ViBiOh/auth/v2/pkg/ident"
"github.com/ViBiOh/auth/v2/pkg/model"
"github.com/ViBiOh/httputils/v4/pkg/httperror"
httpmodel "github.com/ViBiOh/httputils/v4/pkg/model"
"github.com/ViBiOh/httputils/v4/pkg/tracer"
"go.opentelemetry.io/otel/trace"
)
var (
_ httpmodel.Middleware = App{}.Middleware
// ErrEmptyAuth occurs when authorization content is not found
ErrEmptyAuth = errors.New("empty authorization content")
// ErrNoMatchingProvider occurs no provider is found for given auth
ErrNoMatchingProvider = errors.New("no matching provider for Authorization content")
)
// App of package
type App struct {
tracer trace.Tracer
authProvider auth.Provider
identProviders []ident.Provider
}
// New creates new App for given providers
func New(authProvider auth.Provider, tracer trace.Tracer, identProviders ...ident.Provider) App {
return App{
authProvider: authProvider,
identProviders: identProviders,
tracer: tracer,
}
}
// Middleware wraps next authenticated handler
func (a App) Middleware(next http.Handler) http.Handler {
if len(a.identProviders) == 0 {
return next
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodOptions {
w.WriteHeader(http.StatusNoContent)
return
}
provider, user, err := a.IsAuthenticated(r)
if err != nil {
onHandlerFail(w, r, err, provider)
return
}
if next != nil {
next.ServeHTTP(w, r.WithContext(model.StoreUser(r.Context(), user)))
}
})
}
// IsAuthenticated check if request has correct headers for authentification
func (a App) IsAuthenticated(r *http.Request) (ident.Provider, model.User, error) {
if len(a.identProviders) == 0 {
return nil, model.User{}, ErrNoMatchingProvider
}
var err error
ctx, end := tracer.StartSpan(r.Context(), a.tracer, "check_auth", trace.WithSpanKind(trace.SpanKindInternal))
defer end(&err)
authContent := strings.TrimSpace(r.Header.Get("Authorization"))
if len(authContent) == 0 {
return a.identProviders[0], model.User{}, ErrEmptyAuth
}
for _, provider := range a.identProviders {
if !provider.IsMatching(authContent) {
continue
}
user, err := provider.GetUser(ctx, authContent)
if err != nil {
return provider, user, err
}
return provider, user, nil
}
return nil, model.User{}, ErrNoMatchingProvider
}
// IsAuthorized checks if User in context has given profile
func (a App) IsAuthorized(ctx context.Context, profile string) bool {
if a.authProvider == nil {
return false
}
return a.authProvider.IsAuthorized(ctx, model.ReadUser(ctx), profile)
}
func onHandlerFail(w http.ResponseWriter, r *http.Request, err error, provider ident.Provider) {
if err == auth.ErrForbidden {
httperror.Forbidden(w)
} else if provider != nil {
provider.OnError(w, r, err)
} else {
httperror.BadRequest(w, err)
}
}