chrome/renderer/pepper/pepper_flash_renderer_host.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/renderer/pepper/pepper_flash_renderer_host.h"
   6
   7 #include <map>
   8 #include <vector>
   9
  10 #include "base/lazy_instance.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/strings/string_util.h"
  13 #include "components/pdf/renderer/ppb_pdf_impl.h"
  14 #include "content/public/renderer/pepper_plugin_instance.h"
  15 #include "content/public/renderer/render_thread.h"
  16 #include "content/public/renderer/renderer_ppapi_host.h"
  17 #include "ipc/ipc_message_macros.h"
  18 #include "net/http/http_util.h"
  19 #include "ppapi/c/pp_errors.h"
  20 #include "ppapi/c/trusted/ppb_browser_font_trusted.h"
  21 #include "ppapi/host/dispatch_host_message.h"
  22 #include "ppapi/proxy/host_dispatcher.h"
  23 #include "ppapi/proxy/ppapi_messages.h"
  24 #include "ppapi/proxy/resource_message_params.h"
  25 #include "ppapi/proxy/serialized_structs.h"
  26 #include "ppapi/thunk/enter.h"
  27 #include "ppapi/thunk/ppb_image_data_api.h"
  28 #include "skia/ext/platform_canvas.h"
  29 #include "third_party/skia/include/core/SkCanvas.h"
  30 #include "third_party/skia/include/core/SkMatrix.h"
  31 #include "third_party/skia/include/core/SkPaint.h"
  32 #include "third_party/skia/include/core/SkPoint.h"
  33 #include "third_party/skia/include/core/SkTemplates.h"
  34 #include "third_party/skia/include/core/SkTypeface.h"
  35 #include "ui/gfx/geometry/rect.h"
  36 #include "url/gurl.h"
  37
  38 using ppapi::thunk::EnterResourceNoLock;
  39 using ppapi::thunk::PPB_ImageData_API;
  40
  41 namespace {
  42
  43 // Some non-simple HTTP request headers that Flash may set.
  44 // (Please see http://www.w3.org/TR/cors/#simple-header for the definition of
  45 // simple headers.)
  46 //
  47 // The list and the enum defined below are used to collect data about request
  48 // headers used in PPB_Flash.Navigate() calls, in order to understand the impact
  49 // of rejecting PPB_Flash.Navigate() requests with non-simple headers.
  50 //
  51 // TODO(yzshen): We should be able to remove the histogram recording code once
  52 // we get the answer.
  53 const char* const kRejectedHttpRequestHeaders[] = {
  54     "authorization",     //
  55     "cache-control",     //
  56     "content-encoding",  //
  57     "content-md5",       //
  58     "content-type",      // If the media type is not one of those covered by the
  59                          // simple header definition.
  60     "expires",           //
  61     "from",              //
  62     "if-match",          //
  63     "if-none-match",     //
  64     "if-range",          //
  65     "if-unmodified-since",  //
  66     "pragma",               //
  67     "referer"               //
  68 };
  69
  70 // Please note that new entries should be added right above
  71 // FLASH_NAVIGATE_USAGE_ENUM_COUNT, and existing entries shouldn't be re-ordered
  72 // or removed, since this ordering is used in a histogram.
  73 enum FlashNavigateUsage {
  74   // This section must be in the same order as kRejectedHttpRequestHeaders.
  75   REJECT_AUTHORIZATION = 0,
  76   REJECT_CACHE_CONTROL,
  77   REJECT_CONTENT_ENCODING,
  78   REJECT_CONTENT_MD5,
  79   REJECT_CONTENT_TYPE,
  80   REJECT_EXPIRES,
  81   REJECT_FROM,
  82   REJECT_IF_MATCH,
  83   REJECT_IF_NONE_MATCH,
  84   REJECT_IF_RANGE,
  85   REJECT_IF_UNMODIFIED_SINCE,
  86   REJECT_PRAGMA,
  87   REJECT_REFERER,
  88
  89   // The navigate request is rejected because of headers not listed above
  90   // (e.g., custom headers).
  91   REJECT_OTHER_HEADERS,
  92
  93   // Total number of rejected navigate requests.
  94   TOTAL_REJECTED_NAVIGATE_REQUESTS,
  95
  96   // Total number of navigate requests.
  97   TOTAL_NAVIGATE_REQUESTS,
  98   FLASH_NAVIGATE_USAGE_ENUM_COUNT
  99 };
 100
 101 static base::LazyInstance<std::map<std::string, FlashNavigateUsage> >
 102     g_rejected_headers = LAZY_INSTANCE_INITIALIZER;
 103
 104 bool IsSimpleHeader(const std::string& lower_case_header_name,
 105                     const std::string& header_value) {
 106   if (lower_case_header_name == "accept" ||
 107       lower_case_header_name == "accept-language" ||
 108       lower_case_header_name == "content-language") {
 109     return true;
 110   }
 111
 112   if (lower_case_header_name == "content-type") {
 113     std::string lower_case_mime_type;
 114     std::string lower_case_charset;
 115     bool had_charset = false;
 116     net::HttpUtil::ParseContentType(header_value,
 117                                     &lower_case_mime_type,
 118                                     &lower_case_charset,
 119                                     &had_charset,
 120                                     NULL);
 121     return lower_case_mime_type == "application/x-www-form-urlencoded" ||
 122            lower_case_mime_type == "multipart/form-data" ||
 123            lower_case_mime_type == "text/plain";
 124   }
 125
 126   return false;
 127 }
 128
 129 void RecordFlashNavigateUsage(FlashNavigateUsage usage) {
 130   DCHECK_NE(FLASH_NAVIGATE_USAGE_ENUM_COUNT, usage);
 131   UMA_HISTOGRAM_ENUMERATION(
 132       "Plugin.FlashNavigateUsage", usage, FLASH_NAVIGATE_USAGE_ENUM_COUNT);
 133 }
 134
 135 }  // namespace
 136
 137 PepperFlashRendererHost::PepperFlashRendererHost(
 138     content::RendererPpapiHost* host,
 139     PP_Instance instance,
 140     PP_Resource resource)
 141     : ResourceHost(host->GetPpapiHost(), instance, resource),
 142       host_(host),
 143       weak_factory_(this) {}
 144
 145 PepperFlashRendererHost::~PepperFlashRendererHost() {
 146   // This object may be destroyed in the middle of a sync message. If that is
 147   // the case, make sure we respond to all the pending navigate calls.
 148   std::vector<ppapi::host::ReplyMessageContext>::reverse_iterator it;
 149   for (it = navigate_replies_.rbegin(); it != navigate_replies_.rend(); ++it)
 150     SendReply(*it, IPC::Message());
 151 }
 152
 153 int32_t PepperFlashRendererHost::OnResourceMessageReceived(
 154     const IPC::Message& msg,
 155     ppapi::host::HostMessageContext* context) {
 156   PPAPI_BEGIN_MESSAGE_MAP(PepperFlashRendererHost, msg)
 157     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_GetProxyForURL,
 158                                       OnGetProxyForURL)
 159     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_SetInstanceAlwaysOnTop,
 160                                       OnSetInstanceAlwaysOnTop)
 161     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_DrawGlyphs,
 162                                       OnDrawGlyphs)
 163     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_Navigate, OnNavigate)
 164     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_IsRectTopmost,
 165                                       OnIsRectTopmost)
 166     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Flash_InvokePrinting,
 167                                         OnInvokePrinting)
 168   PPAPI_END_MESSAGE_MAP()
 169   return PP_ERROR_FAILED;
 170 }
 171
 172 int32_t PepperFlashRendererHost::OnGetProxyForURL(
 173     ppapi::host::HostMessageContext* host_context,
 174     const std::string& url) {
 175   GURL gurl(url);
 176   if (!gurl.is_valid())
 177     return PP_ERROR_FAILED;
 178   std::string proxy;
 179   bool result = content::RenderThread::Get()->ResolveProxy(gurl, &proxy);
 180   if (!result)
 181     return PP_ERROR_FAILED;
 182   host_context->reply_msg = PpapiPluginMsg_Flash_GetProxyForURLReply(proxy);
 183   return PP_OK;
 184 }
 185
 186 int32_t PepperFlashRendererHost::OnSetInstanceAlwaysOnTop(
 187     ppapi::host::HostMessageContext* host_context,
 188     bool on_top) {
 189   content::PepperPluginInstance* plugin_instance =
 190       host_->GetPluginInstance(pp_instance());
 191   if (plugin_instance)
 192     plugin_instance->SetAlwaysOnTop(on_top);
 193   // Since no reply is sent for this message, it doesn't make sense to return an
 194   // error.
 195   return PP_OK;
 196 }
 197
 198 int32_t PepperFlashRendererHost::OnDrawGlyphs(
 199     ppapi::host::HostMessageContext* host_context,
 200     ppapi::proxy::PPBFlash_DrawGlyphs_Params params) {
 201   if (params.glyph_indices.size() != params.glyph_advances.size() ||
 202       params.glyph_indices.empty())
 203     return PP_ERROR_FAILED;
 204
 205   // Set up the typeface.
 206   int style = SkTypeface::kNormal;
 207   if (static_cast<PP_BrowserFont_Trusted_Weight>(params.font_desc.weight) >=
 208       PP_BROWSERFONT_TRUSTED_WEIGHT_BOLD)
 209     style |= SkTypeface::kBold;
 210   if (params.font_desc.italic)
 211     style |= SkTypeface::kItalic;
 212   skia::RefPtr<SkTypeface> typeface = skia::AdoptRef(SkTypeface::CreateFromName(
 213       params.font_desc.face.c_str(), static_cast<SkTypeface::Style>(style)));
 214   if (!typeface)
 215     return PP_ERROR_FAILED;
 216
 217   EnterResourceNoLock<PPB_ImageData_API> enter(
 218       params.image_data.host_resource(), true);
 219   if (enter.failed())
 220     return PP_ERROR_FAILED;
 221
 222   // Set up the canvas.
 223   PPB_ImageData_API* image = static_cast<PPB_ImageData_API*>(enter.object());
 224   SkCanvas* canvas = image->GetPlatformCanvas();
 225   bool needs_unmapping = false;
 226   if (!canvas) {
 227     needs_unmapping = true;
 228     image->Map();
 229     canvas = image->GetPlatformCanvas();
 230     if (!canvas)
 231       return PP_ERROR_FAILED;  // Failure mapping.
 232   }
 233
 234   SkAutoCanvasRestore acr(canvas, true);
 235
 236   // Clip is applied in pixels before the transform.
 237   SkRect clip_rect = {
 238       SkIntToScalar(params.clip.point.x), SkIntToScalar(params.clip.point.y),
 239       SkIntToScalar(params.clip.point.x + params.clip.size.width),
 240       SkIntToScalar(params.clip.point.y + params.clip.size.height)};
 241   canvas->clipRect(clip_rect);
 242
 243   // Convert & set the matrix.
 244   SkMatrix matrix;
 245   matrix.set(SkMatrix::kMScaleX, SkFloatToScalar(params.transformation[0][0]));
 246   matrix.set(SkMatrix::kMSkewX, SkFloatToScalar(params.transformation[0][1]));
 247   matrix.set(SkMatrix::kMTransX, SkFloatToScalar(params.transformation[0][2]));
 248   matrix.set(SkMatrix::kMSkewY, SkFloatToScalar(params.transformation[1][0]));
 249   matrix.set(SkMatrix::kMScaleY, SkFloatToScalar(params.transformation[1][1]));
 250   matrix.set(SkMatrix::kMTransY, SkFloatToScalar(params.transformation[1][2]));
 251   matrix.set(SkMatrix::kMPersp0, SkFloatToScalar(params.transformation[2][0]));
 252   matrix.set(SkMatrix::kMPersp1, SkFloatToScalar(params.transformation[2][1]));
 253   matrix.set(SkMatrix::kMPersp2, SkFloatToScalar(params.transformation[2][2]));
 254   canvas->concat(matrix);
 255
 256   SkPaint paint;
 257   paint.setColor(params.color);
 258   paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
 259   paint.setAntiAlias(true);
 260   paint.setHinting(SkPaint::kFull_Hinting);
 261   paint.setTextSize(SkIntToScalar(params.font_desc.size));
 262   paint.setTypeface(typeface.get());  // Takes a ref and manages lifetime.
 263   if (params.allow_subpixel_aa) {
 264     paint.setSubpixelText(true);
 265     paint.setLCDRenderText(true);
 266   }
 267
 268   SkScalar x = SkIntToScalar(params.position.x);
 269   SkScalar y = SkIntToScalar(params.position.y);
 270
 271   // Build up the skia advances.
 272   size_t glyph_count = params.glyph_indices.size();
 273   if (glyph_count) {
 274     std::vector<SkPoint> storage;
 275     storage.resize(glyph_count);
 276     SkPoint* sk_positions = &storage[0];
 277     for (uint32_t i = 0; i < glyph_count; i++) {
 278       sk_positions[i].set(x, y);
 279       x += SkFloatToScalar(params.glyph_advances[i].x);
 280       y += SkFloatToScalar(params.glyph_advances[i].y);
 281     }
 282
 283     canvas->drawPosText(
 284         &params.glyph_indices[0], glyph_count * 2, sk_positions, paint);
 285   }
 286
 287   if (needs_unmapping)
 288     image->Unmap();
 289
 290   return PP_OK;
 291 }
 292
 293 // CAUTION: This code is subtle because Navigate is a sync call which may
 294 // cause re-entrancy or cause the instance to be destroyed. If the instance
 295 // is destroyed we need to ensure that we respond to all outstanding sync
 296 // messages so that the plugin process does not remain blocked.
 297 int32_t PepperFlashRendererHost::OnNavigate(
 298     ppapi::host::HostMessageContext* host_context,
 299     const ppapi::URLRequestInfoData& data,
 300     const std::string& target,
 301     bool from_user_action) {
 302   // If our PepperPluginInstance is already destroyed, just return a failure.
 303   content::PepperPluginInstance* plugin_instance =
 304       host_->GetPluginInstance(pp_instance());
 305   if (!plugin_instance)
 306     return PP_ERROR_FAILED;
 307
 308   std::map<std::string, FlashNavigateUsage>& rejected_headers =
 309       g_rejected_headers.Get();
 310   if (rejected_headers.empty()) {
 311     for (size_t i = 0; i < arraysize(kRejectedHttpRequestHeaders); ++i)
 312       rejected_headers[kRejectedHttpRequestHeaders[i]] =
 313           static_cast<FlashNavigateUsage>(i);
 314   }
 315
 316   net::HttpUtil::HeadersIterator header_iter(
 317       data.headers.begin(), data.headers.end(), "\n\r");
 318   bool rejected = false;
 319   while (header_iter.GetNext()) {
 320     std::string lower_case_header_name =
 321         base::StringToLowerASCII(header_iter.name());
 322     if (!IsSimpleHeader(lower_case_header_name, header_iter.values())) {
 323       rejected = true;
 324
 325       std::map<std::string, FlashNavigateUsage>::const_iterator iter =
 326           rejected_headers.find(lower_case_header_name);
 327       FlashNavigateUsage usage =
 328           iter != rejected_headers.end() ? iter->second : REJECT_OTHER_HEADERS;
 329       RecordFlashNavigateUsage(usage);
 330     }
 331   }
 332
 333   RecordFlashNavigateUsage(TOTAL_NAVIGATE_REQUESTS);
 334   if (rejected) {
 335     RecordFlashNavigateUsage(TOTAL_REJECTED_NAVIGATE_REQUESTS);
 336     return PP_ERROR_NOACCESS;
 337   }
 338
 339   // Navigate may call into Javascript (e.g. with a "javascript:" URL),
 340   // or do things like navigate away from the page, either one of which will
 341   // need to re-enter into the plugin. It is safe, because it is essentially
 342   // equivalent to NPN_GetURL, where Flash would expect re-entrancy.
 343   ppapi::proxy::HostDispatcher* host_dispatcher =
 344       ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
 345   host_dispatcher->set_allow_plugin_reentrancy();
 346
 347   // Grab a weak pointer to ourselves on the stack so we can check if we are
 348   // still alive.
 349   base::WeakPtr<PepperFlashRendererHost> weak_ptr = weak_factory_.GetWeakPtr();
 350   // Keep track of reply contexts in case we are destroyed during a Navigate
 351   // call. Even if we are destroyed, we still need to send these replies to
 352   // unblock the plugin process.
 353   navigate_replies_.push_back(host_context->MakeReplyMessageContext());
 354   plugin_instance->Navigate(data, target.c_str(), from_user_action);
 355   // This object might have been destroyed by this point. If it is destroyed
 356   // the reply will be sent in the destructor. Otherwise send the reply here.
 357   if (weak_ptr.get()) {
 358     SendReply(navigate_replies_.back(), IPC::Message());
 359     navigate_replies_.pop_back();
 360   }
 361
 362   // Return PP_OK_COMPLETIONPENDING so that no reply is automatically sent.
 363   return PP_OK_COMPLETIONPENDING;
 364 }
 365
 366 int32_t PepperFlashRendererHost::OnIsRectTopmost(
 367     ppapi::host::HostMessageContext* host_context,
 368     const PP_Rect& rect) {
 369   content::PepperPluginInstance* plugin_instance =
 370       host_->GetPluginInstance(pp_instance());
 371   if (plugin_instance &&
 372       plugin_instance->IsRectTopmost(gfx::Rect(
 373           rect.point.x, rect.point.y, rect.size.width, rect.size.height)))
 374     return PP_OK;
 375   return PP_ERROR_FAILED;
 376 }
 377
 378 int32_t PepperFlashRendererHost::OnInvokePrinting(
 379     ppapi::host::HostMessageContext* host_context) {
 380   pdf::PPB_PDF_Impl::InvokePrintingForInstance(pp_instance());
 381   return PP_OK;
 382 }