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.
5 #include "chrome/common/chrome_content_client.h"
7 #include "base/command_line.h"
9 #include "base/debug/crash_logging.h"
10 #include "base/file_util.h"
11 #include "base/path_service.h"
12 #include "base/strings/string16.h"
13 #include "base/strings/string_number_conversions.h"
14 #include "base/strings/string_split.h"
15 #include "base/strings/string_util.h"
16 #include "base/strings/stringprintf.h"
17 #include "base/strings/utf_string_conversions.h"
18 #include "build/build_config.h"
19 #include "chrome/common/child_process_logging.h"
20 #include "chrome/common/chrome_paths.h"
21 #include "chrome/common/chrome_switches.h"
22 #include "chrome/common/chrome_version_info.h"
23 #include "chrome/common/crash_keys.h"
24 #include "chrome/common/pepper_flash.h"
25 #include "chrome/common/render_messages.h"
26 #include "chrome/common/url_constants.h"
27 #include "components/nacl/common/nacl_process_type.h"
28 #include "content/public/common/content_constants.h"
29 #include "content/public/common/content_switches.h"
30 #include "content/public/common/pepper_plugin_info.h"
31 #include "content/public/common/url_constants.h"
32 #include "content/public/common/user_agent.h"
33 #include "extensions/common/constants.h"
34 #include "gpu/config/gpu_info.h"
35 #include "grit/common_resources.h"
36 #include "ppapi/shared_impl/ppapi_permissions.h"
37 #include "ui/base/l10n/l10n_util.h"
38 #include "ui/base/layout.h"
39 #include "ui/base/resource/resource_bundle.h"
41 #include "flapper_version.h" // In SHARED_INTERMEDIATE_DIR.
42 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
45 #include "base/win/registry.h"
46 #include "base/win/windows_version.h"
47 #elif defined(OS_MACOSX)
48 #include "components/nacl/common/nacl_sandbox_type_mac.h"
51 #if defined(ENABLE_REMOTING)
52 #include "remoting/client/plugin/pepper_entrypoints.h"
55 #if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) && \
56 !defined(WIDEVINE_CDM_IS_COMPONENT)
57 #include "chrome/common/widevine_cdm_constants.h"
62 const char kPDFPluginMimeType
[] = "application/pdf";
63 const char kPDFPluginExtension
[] = "pdf";
64 const char kPDFPluginDescription
[] = "Portable Document Format";
65 const char kPDFPluginPrintPreviewMimeType
[] =
66 "application/x-google-chrome-print-preview-pdf";
67 const char kPDFPluginOutOfProcessMimeType
[] =
68 "application/x-google-chrome-pdf";
69 const uint32 kPDFPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
70 ppapi::PERMISSION_DEV
;
72 const char kNaClPluginMimeType
[] = "application/x-nacl";
73 const char kNaClPluginExtension
[] = "";
74 const char kNaClPluginDescription
[] = "Native Client Executable";
75 const uint32 kNaClPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
76 ppapi::PERMISSION_DEV
;
78 const char kPnaclPluginMimeType
[] = "application/x-pnacl";
79 const char kPnaclPluginExtension
[] = "";
80 const char kPnaclPluginDescription
[] = "Portable Native Client Executable";
82 const char kO1DPluginName
[] = "Google Talk Plugin Video Renderer";
83 const char kO1DPluginMimeType
[] ="application/o1d";
84 const char kO1DPluginExtension
[] = "";
85 const char kO1DPluginDescription
[] = "Google Talk Plugin Video Renderer";
86 const uint32 kO1DPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
87 ppapi::PERMISSION_DEV
;
89 const char kEffectsPluginName
[] = "Google Talk Effects Plugin";
90 const char kEffectsPluginMimeType
[] ="application/x-ppapi-hangouts-effects";
91 const char kEffectsPluginExtension
[] = "";
92 const char kEffectsPluginDescription
[] = "Google Talk Effects Plugin";
93 const uint32 kEffectsPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
94 ppapi::PERMISSION_DEV
;
96 const char kGTalkPluginName
[] = "Google Talk Plugin";
97 const char kGTalkPluginMimeType
[] ="application/googletalk";
98 const char kGTalkPluginExtension
[] = ".googletalk";
99 const char kGTalkPluginDescription
[] = "Google Talk Plugin";
100 const uint32 kGTalkPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
101 ppapi::PERMISSION_DEV
;
103 #if defined(ENABLE_REMOTING)
104 #if defined(GOOGLE_CHROME_BUILD)
105 const char kRemotingViewerPluginName
[] = "Chrome Remote Desktop Viewer";
107 const char kRemotingViewerPluginName
[] = "Chromoting Viewer";
108 #endif // defined(GOOGLE_CHROME_BUILD)
109 const char kRemotingViewerPluginDescription
[] =
110 "This plugin allows you to securely access other computers that have been "
111 "shared with you. To use this plugin you must first install the "
112 "<a href=\"https://chrome.google.com/remotedesktop\">"
113 "Chrome Remote Desktop</a> webapp.";
114 // Use a consistent MIME-type regardless of branding.
115 const char kRemotingViewerPluginMimeType
[] =
116 "application/vnd.chromium.remoting-viewer";
117 const char kRemotingViewerPluginMimeExtension
[] = "";
118 const char kRemotingViewerPluginMimeDescription
[] = "";
119 const uint32 kRemotingViewerPluginPermissions
= ppapi::PERMISSION_PRIVATE
|
120 ppapi::PERMISSION_DEV
;
121 #endif // defined(ENABLE_REMOTING)
123 #if defined(OS_MACOSX) && !defined(OS_IOS)
124 const char kInterposeLibraryPath
[] =
125 "@executable_path/../../../libplugin_carbon_interpose.dylib";
126 #endif // defined(OS_MACOSX) && !defined(OS_IOS)
128 // Appends the known built-in plugins to the given vector. Some built-in
129 // plugins are "internal" which means they are compiled into the Chrome binary,
130 // and some are extra shared libraries distributed with the browser (these are
131 // not marked internal, aside from being automatically registered, they're just
133 void ComputeBuiltInPlugins(std::vector
<content::PepperPluginInfo
>* plugins
) {
136 // Once we're sandboxed, we can't know if the PDF plugin is available or not;
137 // but (on Linux) this function is always called once before we're sandboxed.
138 // So the first time through test if the file is available and then skip the
139 // check on subsequent calls if yes.
140 static bool skip_pdf_file_check
= false;
142 if (PathService::Get(chrome::FILE_PDF_PLUGIN
, &path
)) {
143 if (skip_pdf_file_check
|| base::PathExists(path
)) {
144 content::PepperPluginInfo pdf
;
146 pdf
.name
= ChromeContentClient::kPDFPluginName
;
147 if (CommandLine::ForCurrentProcess()->HasSwitch(
148 switches::kOutOfProcessPdf
)) {
149 pdf
.is_out_of_process
= true;
150 content::WebPluginMimeType
pdf_mime_type(kPDFPluginOutOfProcessMimeType
,
152 kPDFPluginDescription
);
153 pdf
.mime_types
.push_back(pdf_mime_type
);
154 // TODO(raymes): Make print preview work with out of process PDF.
156 content::WebPluginMimeType
pdf_mime_type(kPDFPluginMimeType
,
158 kPDFPluginDescription
);
159 content::WebPluginMimeType
print_preview_pdf_mime_type(
160 kPDFPluginPrintPreviewMimeType
,
162 kPDFPluginDescription
);
163 pdf
.mime_types
.push_back(pdf_mime_type
);
164 pdf
.mime_types
.push_back(print_preview_pdf_mime_type
);
166 pdf
.permissions
= kPDFPluginPermissions
;
167 plugins
->push_back(pdf
);
169 skip_pdf_file_check
= true;
173 // Handle Native Client just like the PDF plugin. This means that it is
174 // enabled by default for the non-portable case. This allows apps installed
175 // from the Chrome Web Store to use NaCl even if the command line switch
176 // isn't set. For other uses of NaCl we check for the command line switch.
177 // Specifically, Portable Native Client is only enabled by the command line
179 static bool skip_nacl_file_check
= false;
180 if (PathService::Get(chrome::FILE_NACL_PLUGIN
, &path
)) {
181 if (skip_nacl_file_check
|| base::PathExists(path
)) {
182 content::PepperPluginInfo nacl
;
184 nacl
.name
= ChromeContentClient::kNaClPluginName
;
185 content::WebPluginMimeType
nacl_mime_type(kNaClPluginMimeType
,
186 kNaClPluginExtension
,
187 kNaClPluginDescription
);
188 nacl
.mime_types
.push_back(nacl_mime_type
);
189 if (!CommandLine::ForCurrentProcess()->HasSwitch(
190 switches::kDisablePnacl
)) {
191 content::WebPluginMimeType
pnacl_mime_type(kPnaclPluginMimeType
,
192 kPnaclPluginExtension
,
193 kPnaclPluginDescription
);
194 nacl
.mime_types
.push_back(pnacl_mime_type
);
196 nacl
.permissions
= kNaClPluginPermissions
;
197 plugins
->push_back(nacl
);
199 skip_nacl_file_check
= true;
203 static bool skip_o1d_file_check
= false;
204 if (PathService::Get(chrome::FILE_O1D_PLUGIN
, &path
)) {
205 if (skip_o1d_file_check
|| base::PathExists(path
)) {
206 content::PepperPluginInfo o1d
;
208 o1d
.name
= kO1DPluginName
;
209 o1d
.is_out_of_process
= true;
210 o1d
.is_sandboxed
= false;
211 o1d
.permissions
= kO1DPluginPermissions
;
212 content::WebPluginMimeType
o1d_mime_type(kO1DPluginMimeType
,
214 kO1DPluginDescription
);
215 o1d
.mime_types
.push_back(o1d_mime_type
);
216 plugins
->push_back(o1d
);
218 skip_o1d_file_check
= true;
222 // TODO(vrk): Remove this when NaCl effects plugin replaces the ppapi effects
224 static bool skip_effects_file_check
= false;
225 if (PathService::Get(chrome::FILE_EFFECTS_PLUGIN
, &path
)) {
226 if (skip_effects_file_check
|| base::PathExists(path
)) {
227 content::PepperPluginInfo effects
;
229 effects
.name
= kEffectsPluginName
;
230 effects
.is_out_of_process
= true;
231 effects
.is_sandboxed
= true;
232 effects
.permissions
= kEffectsPluginPermissions
;
233 content::WebPluginMimeType
effects_mime_type(kEffectsPluginMimeType
,
234 kEffectsPluginExtension
,
235 kEffectsPluginDescription
);
236 effects
.mime_types
.push_back(effects_mime_type
);
237 plugins
->push_back(effects
);
239 skip_effects_file_check
= true;
243 static bool skip_gtalk_file_check
= false;
244 if (PathService::Get(chrome::FILE_GTALK_PLUGIN
, &path
)) {
245 if (skip_gtalk_file_check
|| base::PathExists(path
)) {
246 content::PepperPluginInfo gtalk
;
248 gtalk
.name
= kGTalkPluginName
;
249 gtalk
.is_out_of_process
= true;
250 gtalk
.is_sandboxed
= false;
251 gtalk
.permissions
= kGTalkPluginPermissions
;
252 content::WebPluginMimeType
gtalk_mime_type(kGTalkPluginMimeType
,
253 kGTalkPluginExtension
,
254 kGTalkPluginDescription
);
255 gtalk
.mime_types
.push_back(gtalk_mime_type
);
256 plugins
->push_back(gtalk
);
258 skip_gtalk_file_check
= true;
262 #if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) && \
263 !defined(WIDEVINE_CDM_IS_COMPONENT)
264 static bool skip_widevine_cdm_file_check
= false;
265 if (PathService::Get(chrome::FILE_WIDEVINE_CDM_ADAPTER
, &path
)) {
266 if (skip_widevine_cdm_file_check
|| base::PathExists(path
)) {
267 content::PepperPluginInfo widevine_cdm
;
268 widevine_cdm
.is_out_of_process
= true;
269 widevine_cdm
.path
= path
;
270 widevine_cdm
.name
= kWidevineCdmDisplayName
;
271 widevine_cdm
.description
= kWidevineCdmDescription
;
272 widevine_cdm
.version
= WIDEVINE_CDM_VERSION_STRING
;
273 content::WebPluginMimeType
widevine_cdm_mime_type(
274 kWidevineCdmPluginMimeType
,
275 kWidevineCdmPluginExtension
,
276 kWidevineCdmPluginMimeTypeDescription
);
278 // Add the supported codecs as if they came from the component manifest.
279 std::vector
<std::string
> codecs
;
280 codecs
.push_back(kCdmSupportedCodecVorbis
);
281 codecs
.push_back(kCdmSupportedCodecVp8
);
282 // TODO(xhwang): Add VP9 when it's supported by Widevine CDM.
283 // See http://crbug.com/361318
284 #if defined(USE_PROPRIETARY_CODECS)
285 // TODO(ddorwin): Rename these macros to reflect their real meaning: whether the
286 // CDM Chrome was built [and shipped] with support these types.
287 #if defined(WIDEVINE_CDM_AAC_SUPPORT_AVAILABLE)
288 codecs
.push_back(kCdmSupportedCodecAac
);
290 #if defined(WIDEVINE_CDM_AVC1_SUPPORT_AVAILABLE)
291 codecs
.push_back(kCdmSupportedCodecAvc1
);
293 #endif // defined(USE_PROPRIETARY_CODECS)
294 std::string codec_string
=
295 JoinString(codecs
, kCdmSupportedCodecsValueDelimiter
);
296 widevine_cdm_mime_type
.additional_param_names
.push_back(
297 base::ASCIIToUTF16(kCdmSupportedCodecsParamName
));
298 widevine_cdm_mime_type
.additional_param_values
.push_back(
299 base::ASCIIToUTF16(codec_string
));
301 widevine_cdm
.mime_types
.push_back(widevine_cdm_mime_type
);
302 widevine_cdm
.permissions
= kWidevineCdmPluginPermissions
;
303 plugins
->push_back(widevine_cdm
);
305 skip_widevine_cdm_file_check
= true;
308 #endif // defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) &&
309 // !defined(WIDEVINE_CDM_IS_COMPONENT)
311 // The Remoting Viewer plugin is built-in.
312 #if defined(ENABLE_REMOTING)
313 content::PepperPluginInfo info
;
314 info
.is_internal
= true;
315 info
.is_out_of_process
= true;
316 info
.name
= kRemotingViewerPluginName
;
317 info
.description
= kRemotingViewerPluginDescription
;
318 info
.path
= base::FilePath::FromUTF8Unsafe(
319 ChromeContentClient::kRemotingViewerPluginPath
);
320 content::WebPluginMimeType
remoting_mime_type(
321 kRemotingViewerPluginMimeType
,
322 kRemotingViewerPluginMimeExtension
,
323 kRemotingViewerPluginMimeDescription
);
324 info
.mime_types
.push_back(remoting_mime_type
);
325 info
.internal_entry_points
.get_interface
= remoting::PPP_GetInterface
;
326 info
.internal_entry_points
.initialize_module
=
327 remoting::PPP_InitializeModule
;
328 info
.internal_entry_points
.shutdown_module
= remoting::PPP_ShutdownModule
;
329 info
.permissions
= kRemotingViewerPluginPermissions
;
331 plugins
->push_back(info
);
335 content::PepperPluginInfo
CreatePepperFlashInfo(const base::FilePath
& path
,
336 const std::string
& version
) {
337 content::PepperPluginInfo plugin
;
339 plugin
.is_out_of_process
= true;
340 plugin
.name
= content::kFlashPluginName
;
342 plugin
.permissions
= kPepperFlashPermissions
;
344 std::vector
<std::string
> flash_version_numbers
;
345 base::SplitString(version
, '.', &flash_version_numbers
);
346 if (flash_version_numbers
.size() < 1)
347 flash_version_numbers
.push_back("11");
348 // |SplitString()| puts in an empty string given an empty string. :(
349 else if (flash_version_numbers
[0].empty())
350 flash_version_numbers
[0] = "11";
351 if (flash_version_numbers
.size() < 2)
352 flash_version_numbers
.push_back("2");
353 if (flash_version_numbers
.size() < 3)
354 flash_version_numbers
.push_back("999");
355 if (flash_version_numbers
.size() < 4)
356 flash_version_numbers
.push_back("999");
357 // E.g., "Shockwave Flash 10.2 r154":
358 plugin
.description
= plugin
.name
+ " " + flash_version_numbers
[0] + "." +
359 flash_version_numbers
[1] + " r" + flash_version_numbers
[2];
360 plugin
.version
= JoinString(flash_version_numbers
, '.');
361 content::WebPluginMimeType
swf_mime_type(content::kFlashPluginSwfMimeType
,
362 content::kFlashPluginSwfExtension
,
363 content::kFlashPluginSwfDescription
);
364 plugin
.mime_types
.push_back(swf_mime_type
);
365 content::WebPluginMimeType
spl_mime_type(content::kFlashPluginSplMimeType
,
366 content::kFlashPluginSplExtension
,
367 content::kFlashPluginSplDescription
);
368 plugin
.mime_types
.push_back(spl_mime_type
);
373 void AddPepperFlashFromCommandLine(
374 std::vector
<content::PepperPluginInfo
>* plugins
) {
375 const CommandLine::StringType flash_path
=
376 CommandLine::ForCurrentProcess()->GetSwitchValueNative(
377 switches::kPpapiFlashPath
);
378 if (flash_path
.empty())
381 // Also get the version from the command-line. Should be something like 11.2
383 std::string flash_version
=
384 CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
385 switches::kPpapiFlashVersion
);
388 CreatePepperFlashInfo(base::FilePath(flash_path
), flash_version
));
391 bool GetBundledPepperFlash(content::PepperPluginInfo
* plugin
) {
392 #if defined(FLAPPER_AVAILABLE)
393 CommandLine
* command_line
= CommandLine::ForCurrentProcess();
395 // Ignore bundled Pepper Flash if there is Pepper Flash specified from the
397 if (command_line
->HasSwitch(switches::kPpapiFlashPath
))
401 command_line
->HasSwitch(switches::kDisableBundledPpapiFlash
);
405 // For Linux ia32, Flapper requires SSE2.
406 #if defined(OS_LINUX) && defined(ARCH_CPU_X86)
407 if (!base::CPU().has_sse2())
409 #endif // ARCH_CPU_X86
411 base::FilePath flash_path
;
412 if (!PathService::Get(chrome::FILE_PEPPER_FLASH_PLUGIN
, &flash_path
))
415 *plugin
= CreatePepperFlashInfo(flash_path
, FLAPPER_VERSION_STRING
);
419 #endif // FLAPPER_AVAILABLE
422 std::string
GetProduct() {
423 chrome::VersionInfo version_info
;
424 return version_info
.is_valid() ?
425 version_info
.ProductNameAndVersionForUserAgent() : std::string();
430 std::string
GetUserAgent() {
431 CommandLine
* command_line
= CommandLine::ForCurrentProcess();
432 if (command_line
->HasSwitch(switches::kUserAgent
))
433 return command_line
->GetSwitchValueASCII(switches::kUserAgent
);
435 std::string product
= GetProduct();
436 #if defined(OS_ANDROID)
437 if (command_line
->HasSwitch(switches::kUseMobileUserAgent
))
438 product
+= " Mobile";
440 return content::BuildUserAgentFromProduct(product
);
443 void ChromeContentClient::SetActiveURL(const GURL
& url
) {
444 base::debug::SetCrashKeyValue(crash_keys::kActiveURL
,
445 url
.possibly_invalid_spec());
448 void ChromeContentClient::SetGpuInfo(const gpu::GPUInfo
& gpu_info
) {
449 #if !defined(OS_ANDROID)
450 base::debug::SetCrashKeyValue(crash_keys::kGPUVendorID
,
451 base::StringPrintf("0x%04x", gpu_info
.gpu
.vendor_id
));
452 base::debug::SetCrashKeyValue(crash_keys::kGPUDeviceID
,
453 base::StringPrintf("0x%04x", gpu_info
.gpu
.device_id
));
455 base::debug::SetCrashKeyValue(crash_keys::kGPUDriverVersion
,
456 gpu_info
.driver_version
);
457 base::debug::SetCrashKeyValue(crash_keys::kGPUPixelShaderVersion
,
458 gpu_info
.pixel_shader_version
);
459 base::debug::SetCrashKeyValue(crash_keys::kGPUVertexShaderVersion
,
460 gpu_info
.vertex_shader_version
);
461 #if defined(OS_MACOSX)
462 base::debug::SetCrashKeyValue(crash_keys::kGPUGLVersion
, gpu_info
.gl_version
);
463 #elif defined(OS_POSIX)
464 base::debug::SetCrashKeyValue(crash_keys::kGPUVendor
, gpu_info
.gl_vendor
);
465 base::debug::SetCrashKeyValue(crash_keys::kGPURenderer
, gpu_info
.gl_renderer
);
469 void ChromeContentClient::AddPepperPlugins(
470 std::vector
<content::PepperPluginInfo
>* plugins
) {
471 ComputeBuiltInPlugins(plugins
);
472 AddPepperFlashFromCommandLine(plugins
);
474 content::PepperPluginInfo plugin
;
475 if (GetBundledPepperFlash(&plugin
))
476 plugins
->push_back(plugin
);
479 void ChromeContentClient::AddAdditionalSchemes(
480 std::vector
<std::string
>* standard_schemes
,
481 std::vector
<std::string
>* savable_schemes
) {
482 standard_schemes
->push_back(extensions::kExtensionScheme
);
483 savable_schemes
->push_back(extensions::kExtensionScheme
);
484 standard_schemes
->push_back(chrome::kChromeNativeScheme
);
485 standard_schemes
->push_back(extensions::kExtensionResourceScheme
);
486 savable_schemes
->push_back(extensions::kExtensionResourceScheme
);
487 standard_schemes
->push_back(chrome::kChromeSearchScheme
);
488 savable_schemes
->push_back(chrome::kChromeSearchScheme
);
489 standard_schemes
->push_back(chrome::kDomDistillerScheme
);
490 savable_schemes
->push_back(chrome::kDomDistillerScheme
);
491 #if defined(OS_CHROMEOS)
492 standard_schemes
->push_back(chrome::kCrosScheme
);
496 std::string
ChromeContentClient::GetProduct() const {
497 return ::GetProduct();
500 std::string
ChromeContentClient::GetUserAgent() const {
501 return ::GetUserAgent();
504 base::string16
ChromeContentClient::GetLocalizedString(int message_id
) const {
505 return l10n_util::GetStringUTF16(message_id
);
508 base::StringPiece
ChromeContentClient::GetDataResource(
510 ui::ScaleFactor scale_factor
) const {
511 return ResourceBundle::GetSharedInstance().GetRawDataResourceForScale(
512 resource_id
, scale_factor
);
515 base::RefCountedStaticMemory
* ChromeContentClient::GetDataResourceBytes(
516 int resource_id
) const {
517 return ResourceBundle::GetSharedInstance().LoadDataResourceBytes(resource_id
);
520 gfx::Image
& ChromeContentClient::GetNativeImageNamed(int resource_id
) const {
521 return ResourceBundle::GetSharedInstance().GetNativeImageNamed(resource_id
);
524 std::string
ChromeContentClient::GetProcessTypeNameInEnglish(int type
) {
526 case PROCESS_TYPE_NACL_LOADER
:
527 return "Native Client module";
528 case PROCESS_TYPE_NACL_BROKER
:
529 return "Native Client broker";
532 DCHECK(false) << "Unknown child process type!";
536 #if defined(OS_MACOSX) && !defined(OS_IOS)
537 bool ChromeContentClient::GetSandboxProfileForSandboxType(
539 int* sandbox_profile_resource_id
) const {
540 DCHECK(sandbox_profile_resource_id
);
541 if (sandbox_type
== NACL_SANDBOX_TYPE_NACL_LOADER
) {
542 *sandbox_profile_resource_id
= IDR_NACL_SANDBOX_PROFILE
;
548 std::string
ChromeContentClient::GetCarbonInterposePath() const {
549 return std::string(kInterposeLibraryPath
);