diff --git a/v2/pkg/assetserver/webview/request_linux_purego.go b/v2/pkg/assetserver/webview/request_linux_purego.go new file mode 100644 index 000000000..bf724a55b --- /dev/null +++ b/v2/pkg/assetserver/webview/request_linux_purego.go @@ -0,0 +1,94 @@ +//go:build linux && purego +// +build linux,purego + +package webview + +import ( + "io" + "net/http" + + "github.com/ebitengine/purego" +) + +// NewRequest creates as new WebViewRequest based on a pointer to an `WebKitURISchemeRequest` +// +// Please make sure to call Release() when finished using the request. +func NewRequest(webKitURISchemeRequest uintptr) Request { + webkitReq := webKitURISchemeRequest + req := &request{req: webkitReq} + req.AddRef() + return req +} + +var _ Request = &request{} + +type request struct { + req uintptr + + header http.Header + body io.ReadCloser + rw *responseWriter +} + +func (r *request) AddRef() error { + var objectRef func(uintptr) + purego.RegisterLibFunc(&objectRef, gtk, "g_object_ref") + objectRef(r.req) + return nil +} + +func (r *request) Release() error { + var objectUnref func(uintptr) + purego.RegisterLibFunc(&objectUnref, gtk, "g_object_unref") + objectUnref(r.req) + return nil +} + +func (r *request) URL() (string, error) { + var getUri func(uintptr) string + purego.RegisterLibFunc(&getUri, webkit, "webkit_uri_scheme_request_get_uri") + return getUri(r.req), nil +} + +func (r *request) Method() (string, error) { + return webkit_uri_scheme_request_get_http_method(r.req), nil +} + +func (r *request) Header() (http.Header, error) { + if r.header != nil { + return r.header, nil + } + + r.header = webkit_uri_scheme_request_get_http_headers(r.req) + return r.header, nil +} + +func (r *request) Body() (io.ReadCloser, error) { + if r.body != nil { + return r.body, nil + } + + // WebKit2GTK has currently no support for request bodies. + r.body = http.NoBody + + return r.body, nil +} + +func (r *request) Response() ResponseWriter { + if r.rw != nil { + return r.rw + } + + r.rw = &responseWriter{req: r.req} + return r.rw +} + +func (r *request) Close() error { + var err error + if r.body != nil { + err = r.body.Close() + } + r.Response().Finish() + r.Release() + return err +} diff --git a/v2/pkg/assetserver/webview/responsewriter_linux_purego.go b/v2/pkg/assetserver/webview/responsewriter_linux_purego.go new file mode 100644 index 000000000..c62f54a55 --- /dev/null +++ b/v2/pkg/assetserver/webview/responsewriter_linux_purego.go @@ -0,0 +1,174 @@ +//go:build linux && purego +// +build linux,purego + +package webview + +import ( + "fmt" + "io" + "net/http" + "os" + "strconv" + "syscall" + + "github.com/ebitengine/purego" +) + +const ( + gtk3 = "libgtk-3.so" + gtk4 = "libgtk-4.so" +) + +var ( + gtk uintptr + webkit uintptr + version int +) + +func init() { + var err error + // gtk, err = purego.Dlopen(gtk4, purego.RTLD_NOW|purego.RTLD_GLOBAL) + // if err == nil { + // version = 4 + // return + // } + // log.Println("Failed to open GTK4: Falling back to GTK3") + gtk, err = purego.Dlopen(gtk3, purego.RTLD_NOW|purego.RTLD_GLOBAL) + if err != nil { + panic(err) + } + version = 3 + + var webkit4 string = "libwebkit2gtk-4.1.so" + webkit, err = purego.Dlopen(webkit4, purego.RTLD_NOW|purego.RTLD_GLOBAL) + if err != nil { + panic(err) + } +} + +type responseWriter struct { + req uintptr + + header http.Header + wroteHeader bool + finished bool + + w io.WriteCloser + wErr error +} + +func (rw *responseWriter) Header() http.Header { + if rw.header == nil { + rw.header = http.Header{} + } + return rw.header +} + +func (rw *responseWriter) Write(buf []byte) (int, error) { + if rw.finished { + return 0, errResponseFinished + } + + rw.WriteHeader(http.StatusOK) + if rw.wErr != nil { + return 0, rw.wErr + } + return rw.w.Write(buf) +} + +func (rw *responseWriter) WriteHeader(code int) { + // TODO? Is this ever called? I don't think so! + if rw.wroteHeader || rw.finished { + return + } + rw.wroteHeader = true + + contentLength := int64(-1) + if sLen := rw.Header().Get(HeaderContentLength); sLen != "" { + if pLen, _ := strconv.ParseInt(sLen, 10, 64); pLen > 0 { + contentLength = pLen + } + } + // We can't use os.Pipe here, because that returns files with a finalizer for closing the FD. But the control over the + // read FD is given to the InputStream and will be closed there. + // Furthermore we especially don't want to have the FD_CLOEXEC + rFD, w, err := pipe() + if err != nil { + rw.finishWithError(http.StatusInternalServerError, fmt.Errorf("unable to open pipe: %s", err)) + return + } + rw.w = w + + var newStream func(int, bool) uintptr + purego.RegisterLibFunc(&newStream, gtk, "g_unix_input_stream_new") + var unRef func(uintptr) + purego.RegisterLibFunc(&unRef, gtk, "g_object_unref") + stream := newStream(rFD, true) + + /* var reqFinish func(uintptr, uintptr, uintptr, uintptr, int64) int + purego.RegisterLibFunc(&reqFinish, webkit, "webkit_uri_scheme_request_finish") + + header := rw.Header() + defer unRef(stream) + if err := reqFinish(rw.req, code, header, stream, contentLength); err != nil { + rw.finishWithError(http.StatusInternalServerError, fmt.Errorf("unable to finish request: %s", err)) + } + */ + if err := webkit_uri_scheme_request_finish(rw.req, code, rw.Header(), stream, contentLength); err != nil { + rw.finishWithError(http.StatusInternalServerError, fmt.Errorf("unable to finish request: %s", err)) + return + } +} + +func (rw *responseWriter) Finish() { + if !rw.wroteHeader { + rw.WriteHeader(http.StatusNotImplemented) + } + + if rw.finished { + return + } + rw.finished = true + if rw.w != nil { + rw.w.Close() + } +} + +func (rw *responseWriter) finishWithError(code int, err error) { + if rw.w != nil { + rw.w.Close() + rw.w = &nopCloser{io.Discard} + } + rw.wErr = err + + var newLiteral func(uint32, string, int, string) uintptr // is this correct? + purego.RegisterLibFunc(&newLiteral, gtk, "g_error_new_literal") + var newQuark func(string) uintptr + purego.RegisterLibFunc(&newQuark, gtk, "g_quark_from_string") + var freeError func(uintptr) + purego.RegisterLibFunc(&freeError, gtk, "g_error_free") + var finishError func(uintptr, uintptr) + purego.RegisterLibFunc(&finishError, webkit, "webkit_uri_scheme_request_finish_error") + + msg := string(err.Error()) + //gquark := newQuark(msg) + gerr := newLiteral(1, msg, code, msg) + finishError(rw.req, gerr) + freeError(gerr) +} + +type nopCloser struct { + io.Writer +} + +func (nopCloser) Close() error { return nil } + +func pipe() (r int, w *os.File, err error) { + var p [2]int + e := syscall.Pipe2(p[0:], 0) + if e != nil { + return 0, nil, fmt.Errorf("pipe2: %s", e) + } + + return p[0], os.NewFile(uintptr(p[1]), "|1"), nil +} diff --git a/v2/pkg/assetserver/webview/webkit2_36+_purego.go b/v2/pkg/assetserver/webview/webkit2_36+_purego.go new file mode 100644 index 000000000..2386868c3 --- /dev/null +++ b/v2/pkg/assetserver/webview/webkit2_36+_purego.go @@ -0,0 +1,94 @@ +//go:build linux && (webkit2_36 || webkit2_40) && purego + +package webview + +import ( + "net/http" + "strings" + + "github.com/ebitengine/purego" +) + +func webkit_uri_scheme_request_get_http_method(req uintptr) string { + var getMethod func(uintptr) string + purego.RegisterLibFunc(&getMethod, gtk, "webkit_uri_scheme_request_get_http_method") + return strings.ToUpper(getMethod(req)) +} + +func webkit_uri_scheme_request_get_http_headers(req uintptr) http.Header { + var getHeaders func(uintptr) uintptr + purego.RegisterLibFunc(&getUri, webkit, "webkit_uri_scheme_request_get_http_headers") + + hdrs := getHeaders(req) + + var headersIterInit func(uintptr, uintptr) uintptr + purego.RegisterLibFunc(&headersIterInit, gtk, "soup_message_headers_iter_init") + + // TODO: How do we get a struct? + /* + typedef struct { + SoupMessageHeaders *hdrs; + int index_common; + int index_uncommon; + } SoupMessageHeadersIterReal; + */ + iter := make([]byte, 12) + headersIterInit(&iter, hdrs) + + var iterNext func(uintptr, *string, *string) int + purego.RegisterLibFunc(&iterNext, gtk, "soup_message_headers_iter_next") + + var name string + var value string + h := http.Header{} + + for iterNext(&iter, &name, &value) != 0 { + h.Add(name, value) + } + + return h +} + +func webkit_uri_scheme_request_finish(req uintptr, code int, header http.Header, stream uintptr, streamLength int64) error { + + var newResponse func(uintptr, int64) string + purego.RegisterLibFunc(&newResponse, webkit, "webkit_uri_scheme_response_new") + var unRef func(uintptr) + purego.RegisterLibFunc(&unRef, gtk, "g_object_unref") + + resp := newResponse(stream, streamLength) + defer unRef(resp) + + var setStatus func(uintptr, int, string) + purego.RegisterLibFunc(&unRef, webkit, "webkit_uri_scheme_response_set_status") + + setStatus(resp, code, cReason) + + var setContentType func(uintptr, string) + purego.RegisterLibFunc(&unRef, webkit, "webkit_uri_scheme_response_set_content_type") + + setContentType(resp, header.Get(HeaderContentType)) + + soup := gtk + var soupHeadersNew func(int) uintptr + purego.RegisterLibFunc(&unRef, soup, "soup_message_headers_new") + var soupHeadersAppend func(uintptr, string, string) + purego.RegisterLibFunc(&unRef, soup, "soup_message_headers_append") + + hdrs := soupHeadersNew(SOUP_MESSAGE_HEADERS_RESPONSE) + for name, values := range header { + for _, value := range values { + soupHeadersAppend(hdrs, name, value) + } + } + + var setHttpHeaders func(uintptr, uintptr) + purego.RegisterLibFunc(&unRef, webkit, "webkit_uri_scheme_response_set_http_headers") + + setHttpHeaders(resp, hdrs) + var finishWithResponse func(uintptr, uintptr) + purego.RegisterLibFunc(&unRef, webkit, "webkit_uri_scheme_request_finish_with_response") + finishWithResponse(req, resp) + + return nil +} diff --git a/v2/pkg/assetserver/webview/webkit2_40+_purego.go b/v2/pkg/assetserver/webview/webkit2_40+_purego.go new file mode 100644 index 000000000..1088be25e --- /dev/null +++ b/v2/pkg/assetserver/webview/webkit2_40+_purego.go @@ -0,0 +1,74 @@ +//go:build linux && webkit2_40 && purego + +package webview + +import ( + "fmt" + "io" + "net/http" + "unsafe" +) + +func webkit_uri_scheme_request_get_http_body(req *C.WebKitURISchemeRequest) io.ReadCloser { + stream := C.webkit_uri_scheme_request_get_http_body(req) + if stream == nil { + return http.NoBody + } + return &webkitRequestBody{stream: stream} +} + +type webkitRequestBody struct { + stream *C.GInputStream + closed bool +} + +// Read implements io.Reader +func (r *webkitRequestBody) Read(p []byte) (int, error) { + if r.closed { + return 0, io.ErrClosedPipe + } + + var content unsafe.Pointer + var contentLen int + if p != nil { + content = unsafe.Pointer(&p[0]) + contentLen = len(p) + } + + var n C.gsize + var gErr *C.GError + res := C.g_input_stream_read_all(r.stream, content, C.gsize(contentLen), &n, nil, &gErr) + if res == 0 { + return 0, formatGError("stream read failed", gErr) + } else if n == 0 { + return 0, io.EOF + } + return int(n), nil +} + +func (r *webkitRequestBody) Close() error { + if r.closed { + return nil + } + r.closed = true + + // https://docs.gtk.org/gio/method.InputStream.close.html + // Streams will be automatically closed when the last reference is dropped, but you might want to call this function + // to make sure resources are released as early as possible. + var err error + var gErr *C.GError + if C.g_input_stream_close(r.stream, nil, &gErr) == 0 { + err = formatGError("stream close failed", gErr) + } + C.g_object_unref(C.gpointer(r.stream)) + r.stream = nil + return err +} + +func formatGError(msg string, gErr *C.GError, args ...any) error { + if gErr != nil && gErr.message != nil { + msg += ": " + C.GoString(gErr.message) + C.g_error_free(gErr) + } + return fmt.Errorf(msg, args...) +} diff --git a/v2/pkg/assetserver/webview/webkit2_legacy_purego.go b/v2/pkg/assetserver/webview/webkit2_legacy_purego.go new file mode 100644 index 000000000..2e88864c8 --- /dev/null +++ b/v2/pkg/assetserver/webview/webkit2_legacy_purego.go @@ -0,0 +1,36 @@ +//go:build linux && !(webkit2_36 || webkit2_40) && purego + +package webview + +import ( + "fmt" + "io" + "net/http" + + "github.com/ebitengine/purego" +) + +const Webkit2MinMinorVersion = 0 + +func webkit_uri_scheme_request_get_http_method(_ uintptr) string { + return http.MethodGet +} + +func webkit_uri_scheme_request_get_http_headers(_ uintptr) http.Header { + return http.Header{} +} + +func webkit_uri_scheme_request_get_http_body(_ uintptr) io.ReadCloser { + return http.NoBody +} + +func webkit_uri_scheme_request_finish(req uintptr, code int, header http.Header, stream uintptr, streamLength int64) error { + if code != http.StatusOK { + return fmt.Errorf("StatusCodes not supported: %d - %s", code, http.StatusText(code)) + } + + var requestFinish func(uintptr, uintptr, int64, string) + purego.RegisterLibFunc(&requestFinish, webkit, "webkit_uri_scheme_request_finish") + requestFinish(req, stream, streamLength, header.Get(HeaderContentType)) + return nil +}