Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 208 insertions, 0 deletions

diff --git a/dom/canvas/CanvasUtils.h b/dom/canvas/CanvasUtils.h
new file mode 100644
index 0000000000..801f5e01b9
--- /dev/null
+++ b/dom/canvas/CanvasUtils.h
@@ -0,0 +1,208 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _CANVASUTILS_H_
+#define _CANVASUTILS_H_
+
+#include "CanvasRenderingContextHelper.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "jsapi.h"
+#include "js/Array.h"               // JS::GetArrayLength
+#include "js/PropertyAndElement.h"  // JS_GetElement
+#include "mozilla/FloatingPoint.h"
+
+class nsIPrincipal;
+
+namespace mozilla {
+
+namespace dom {
+class Document;
+class HTMLCanvasElement;
+class OffscreenCanvas;
+}  // namespace dom
+
+namespace CanvasUtils {
+
+bool GetCanvasContextType(const nsAString& str,
+                          dom::CanvasContextType* const out_type);
+
+// Check that the rectangle [x,y,w,h] is a subrectangle of
+// [0,0,realWidth,realHeight]
+
+inline bool CheckSaneSubrectSize(int32_t x, int32_t y, int32_t w, int32_t h,
+                                 int32_t realWidth, int32_t realHeight) {
+  CheckedInt32 checked_xmost = CheckedInt32(x) + w;
+  CheckedInt32 checked_ymost = CheckedInt32(y) + h;
+
+  return w >= 0 && h >= 0 && x >= 0 && y >= 0 && checked_xmost.isValid() &&
+         checked_xmost.value() <= realWidth && checked_ymost.isValid() &&
+         checked_ymost.value() <= realHeight;
+}
+
+// Flag aCanvasElement as write-only if drawing an image with aPrincipal
+// onto it would make it such.
+
+void DoDrawImageSecurityCheck(dom::HTMLCanvasElement* aCanvasElement,
+                              nsIPrincipal* aPrincipal, bool forceWriteOnly,
+                              bool CORSUsed);
+
+void DoDrawImageSecurityCheck(dom::OffscreenCanvas* aOffscreenCanvas,
+                              nsIPrincipal* aPrincipal, bool forceWriteOnly,
+                              bool CORSUsed);
+
+// Check if the context is chrome or has the permission to drawWindow
+bool HasDrawWindowPrivilege(JSContext* aCx, JSObject* aObj);
+
+// Check if the context has permission to use OffscreenCanvas.
+bool IsOffscreenCanvasEnabled(JSContext* aCx, JSObject* aObj);
+
+// Check site-specific permission and display prompt if appropriate.
+bool IsImageExtractionAllowed(dom::Document* aDocument, JSContext* aCx,
+                              nsIPrincipal& aPrincipal);
+
+enum class ImageExtraction {
+  Unrestricted,
+  Placeholder,
+  Randomize,
+};
+
+// Returns whether the result of an image extraction should be replaced
+// by a placeholder or randomized.
+ImageExtraction ImageExtractionResult(dom::HTMLCanvasElement* aCanvasElement,
+                                      JSContext* aCx, nsIPrincipal& aPrincipal);
+ImageExtraction ImageExtractionResult(dom::OffscreenCanvas* aOffscreenCanvas,
+                                      JSContext* aCx, nsIPrincipal& aPrincipal);
+
+// Make a double out of |v|, treating undefined values as 0.0 (for
+// the sake of sparse arrays).  Return true iff coercion
+// succeeded.
+bool CoerceDouble(const JS::Value& v, double* d);
+
+/* Float validation stuff */
+#define VALIDATE(_f) \
+  if (!std::isfinite(_f)) return false
+
+inline bool FloatValidate(double f1) {
+  VALIDATE(f1);
+  return true;
+}
+
+inline bool FloatValidate(double f1, double f2) {
+  VALIDATE(f1);
+  VALIDATE(f2);
+  return true;
+}
+
+inline bool FloatValidate(double f1, double f2, double f3) {
+  VALIDATE(f1);
+  VALIDATE(f2);
+  VALIDATE(f3);
+  return true;
+}
+
+inline bool FloatValidate(double f1, double f2, double f3, double f4) {
+  VALIDATE(f1);
+  VALIDATE(f2);
+  VALIDATE(f3);
+  VALIDATE(f4);
+  return true;
+}
+
+inline bool FloatValidate(double f1, double f2, double f3, double f4,
+                          double f5) {
+  VALIDATE(f1);
+  VALIDATE(f2);
+  VALIDATE(f3);
+  VALIDATE(f4);
+  VALIDATE(f5);
+  return true;
+}
+
+inline bool FloatValidate(double f1, double f2, double f3, double f4, double f5,
+                          double f6) {
+  VALIDATE(f1);
+  VALIDATE(f2);
+  VALIDATE(f3);
+  VALIDATE(f4);
+  VALIDATE(f5);
+  VALIDATE(f6);
+  return true;
+}
+
+#undef VALIDATE
+
+template <typename T>
+nsresult JSValToDashArray(JSContext* cx, const JS::Value& patternArray,
+                          nsTArray<T>& dashes) {
+  // The cap is pretty arbitrary.  16k should be enough for
+  // anybody...
+  static const uint32_t MAX_NUM_DASHES = 1 << 14;
+
+  if (!patternArray.isPrimitive()) {
+    JS::Rooted<JSObject*> obj(cx, patternArray.toObjectOrNull());
+    uint32_t length;
+    if (!JS::GetArrayLength(cx, obj, &length)) {
+      // Not an array-like thing
+      return NS_ERROR_INVALID_ARG;
+    } else if (length > MAX_NUM_DASHES) {
+      // Too many dashes in the pattern
+      return NS_ERROR_ILLEGAL_VALUE;
+    }
+
+    bool haveNonzeroElement = false;
+    for (uint32_t i = 0; i < length; ++i) {
+      JS::Rooted<JS::Value> elt(cx);
+      double d;
+      if (!JS_GetElement(cx, obj, i, &elt)) {
+        return NS_ERROR_FAILURE;
+      }
+      if (!(CoerceDouble(elt, &d) && FloatValidate(d) && d >= 0.0)) {
+        // Pattern elements must be finite "numbers" >= 0.
+        return NS_ERROR_INVALID_ARG;
+      } else if (d > 0.0) {
+        haveNonzeroElement = true;
+      }
+      if (!dashes.AppendElement(d, mozilla::fallible)) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+    }
+
+    if (dashes.Length() > 0 && !haveNonzeroElement) {
+      // An all-zero pattern makes no sense.
+      return NS_ERROR_ILLEGAL_VALUE;
+    }
+  } else if (!(patternArray.isUndefined() || patternArray.isNull())) {
+    // undefined and null mean "reset to no dash".  Any other
+    // random garbage is a type error.
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  return NS_OK;
+}
+
+template <typename T>
+void DashArrayToJSVal(nsTArray<T>& dashes, JSContext* cx,
+                      JS::MutableHandle<JS::Value> retval,
+                      mozilla::ErrorResult& rv) {
+  if (dashes.IsEmpty()) {
+    retval.setNull();
+    return;
+  }
+  JS::Rooted<JS::Value> val(cx);
+  if (!mozilla::dom::ToJSValue(cx, dashes, retval)) {
+    rv.Throw(NS_ERROR_OUT_OF_MEMORY);
+  }
+}
+
+// returns true if write-only mode must used for this principal based on
+// the incumbent global.
+bool CheckWriteOnlySecurity(bool aCORSUsed, nsIPrincipal* aPrincipal,
+                            bool aHadCrossOriginRedirects);
+
+}  // namespace CanvasUtils
+}  // namespace mozilla
+
+#endif /* _CANVASUTILS_H_ */