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diff --git a/uriloader/exthandler/win/nsOSHelperAppService.cpp b/uriloader/exthandler/win/nsOSHelperAppService.cpp
new file mode 100644
index 0000000000..8d23dd758d
--- /dev/null
+++ b/uriloader/exthandler/win/nsOSHelperAppService.cpp
@@ -0,0 +1,612 @@
+/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim:set ts=2 sts=2 sw=2 et cin:
+ *
+ * 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/. */
+
+#include "nsComponentManagerUtils.h"
+#include "nsOSHelperAppService.h"
+#include "nsISupports.h"
+#include "nsString.h"
+#include "nsIMIMEInfo.h"
+#include "nsMIMEInfoWin.h"
+#include "nsMimeTypes.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsLocalFile.h"
+#include "nsIWindowsRegKey.h"
+#include "nsXULAppAPI.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "mozilla/WindowsVersion.h"
+
+// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN
+#include <shellapi.h>
+#include <shlwapi.h>
+
+#define LOG(...) MOZ_LOG(sLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
+
+// helper methods: forward declarations...
+static nsresult GetExtensionFromWindowsMimeDatabase(const nsACString& aMimeType,
+ nsString& aFileExtension);
+
+nsOSHelperAppService::nsOSHelperAppService()
+ : nsExternalHelperAppService(), mAppAssoc(nullptr) {
+ CoInitialize(nullptr);
+ CoCreateInstance(CLSID_ApplicationAssociationRegistration, nullptr,
+ CLSCTX_INPROC, IID_IApplicationAssociationRegistration,
+ (void**)&mAppAssoc);
+}
+
+nsOSHelperAppService::~nsOSHelperAppService() {
+ if (mAppAssoc) mAppAssoc->Release();
+ mAppAssoc = nullptr;
+ CoUninitialize();
+}
+
+// The windows registry provides a mime database key which lists a set of mime
+// types and corresponding "Extension" values. we can use this to look up our
+// mime type to see if there is a preferred extension for the mime type.
+static nsresult GetExtensionFromWindowsMimeDatabase(const nsACString& aMimeType,
+ nsString& aFileExtension) {
+ nsAutoString mimeDatabaseKey;
+ mimeDatabaseKey.AssignLiteral("MIME\\Database\\Content Type\\");
+
+ AppendASCIItoUTF16(aMimeType, mimeDatabaseKey);
+
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return NS_ERROR_NOT_AVAILABLE;
+
+ nsresult rv =
+ regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, mimeDatabaseKey,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+
+ if (NS_SUCCEEDED(rv))
+ regKey->ReadStringValue(u"Extension"_ns, aFileExtension);
+
+ return NS_OK;
+}
+
+nsresult nsOSHelperAppService::OSProtocolHandlerExists(
+ const char* aProtocolScheme, bool* aHandlerExists) {
+ // look up the protocol scheme in the windows registry....if we find a match
+ // then we have a handler for it...
+ *aHandlerExists = false;
+ if (aProtocolScheme && *aProtocolScheme) {
+ NS_ENSURE_TRUE(mAppAssoc, NS_ERROR_NOT_AVAILABLE);
+ wchar_t* pResult = nullptr;
+ NS_ConvertASCIItoUTF16 scheme(aProtocolScheme);
+ // We are responsible for freeing returned strings.
+ HRESULT hr = mAppAssoc->QueryCurrentDefault(scheme.get(), AT_URLPROTOCOL,
+ AL_EFFECTIVE, &pResult);
+ if (SUCCEEDED(hr)) {
+ CoTaskMemFree(pResult);
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ nsresult rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+ nsDependentString(scheme.get()),
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) {
+ // Open will fail if the registry key path doesn't exist.
+ return NS_OK;
+ }
+
+ bool hasValue;
+ rv = regKey->HasValue(u"URL Protocol"_ns, &hasValue);
+ if (NS_FAILED(rv)) {
+ return NS_ERROR_FAILURE;
+ }
+ if (!hasValue) {
+ return NS_OK;
+ }
+
+ *aHandlerExists = true;
+ }
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsOSHelperAppService::GetApplicationDescription(
+ const nsACString& aScheme, nsAString& _retval) {
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return NS_ERROR_NOT_AVAILABLE;
+
+ NS_ConvertASCIItoUTF16 buf(aScheme);
+
+ if (mozilla::IsWin8OrLater()) {
+ wchar_t result[1024];
+ DWORD resultSize = 1024;
+ HRESULT hr = AssocQueryString(0x1000 /* ASSOCF_IS_PROTOCOL */,
+ ASSOCSTR_FRIENDLYAPPNAME, buf.get(), NULL,
+ result, &resultSize);
+ if (SUCCEEDED(hr)) {
+ _retval = result;
+ return NS_OK;
+ }
+ }
+
+ NS_ENSURE_TRUE(mAppAssoc, NS_ERROR_NOT_AVAILABLE);
+ wchar_t* pResult = nullptr;
+ // We are responsible for freeing returned strings.
+ HRESULT hr = mAppAssoc->QueryCurrentDefault(buf.get(), AT_URLPROTOCOL,
+ AL_EFFECTIVE, &pResult);
+ if (SUCCEEDED(hr)) {
+ nsCOMPtr<nsIFile> app;
+ nsAutoString appInfo(pResult);
+ CoTaskMemFree(pResult);
+ if (NS_SUCCEEDED(GetDefaultAppInfo(appInfo, _retval, getter_AddRefs(app))))
+ return NS_OK;
+ }
+ return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP nsOSHelperAppService::IsCurrentAppOSDefaultForProtocol(
+ const nsACString& aScheme, bool* _retval) {
+ *_retval = false;
+
+ NS_ENSURE_TRUE(mAppAssoc, NS_ERROR_NOT_AVAILABLE);
+
+ NS_ConvertASCIItoUTF16 buf(aScheme);
+
+ // Find the progID
+ wchar_t* pResult = nullptr;
+ HRESULT hr = mAppAssoc->QueryCurrentDefault(buf.get(), AT_URLPROTOCOL,
+ AL_EFFECTIVE, &pResult);
+ if (FAILED(hr)) {
+ return NS_ERROR_FAILURE;
+ }
+ nsAutoString progID(pResult);
+ // We are responsible for freeing returned strings.
+ CoTaskMemFree(pResult);
+
+ // Find the default executable.
+ nsAutoString description;
+ nsCOMPtr<nsIFile> appFile;
+ nsresult rv = GetDefaultAppInfo(progID, description, getter_AddRefs(appFile));
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ // Determine if the default executable is our executable.
+ nsCOMPtr<nsIFile> ourBinary;
+ XRE_GetBinaryPath(getter_AddRefs(ourBinary));
+ bool isSame = false;
+ rv = appFile->Equals(ourBinary, &isSame);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ *_retval = isSame;
+ return NS_OK;
+}
+
+// GetMIMEInfoFromRegistry: This function obtains the values of some of the
+// nsIMIMEInfo attributes for the mimeType/extension associated with the input
+// registry key. The default entry for that key is the name of a registry key
+// under HKEY_CLASSES_ROOT. The default value for *that* key is the descriptive
+// name of the type. The EditFlags value is a binary value; the low order bit
+// of the third byte of which indicates that the user does not need to be
+// prompted.
+//
+// This function sets only the Description attribute of the input nsIMIMEInfo.
+/* static */
+nsresult nsOSHelperAppService::GetMIMEInfoFromRegistry(const nsString& fileType,
+ nsIMIMEInfo* pInfo) {
+ nsresult rv = NS_OK;
+
+ NS_ENSURE_ARG(pInfo);
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return NS_ERROR_NOT_AVAILABLE;
+
+ rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, fileType,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
+
+ // OK, the default value here is the description of the type.
+ nsAutoString description;
+ rv = regKey->ReadStringValue(u""_ns, description);
+ if (NS_SUCCEEDED(rv)) pInfo->SetDescription(description);
+
+ return NS_OK;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////
+// method overrides used to gather information from the windows registry for
+// various mime types.
+////////////////////////////////////////////////////////////////////////////////////////////////
+
+/// Looks up the type for the extension aExt and compares it to aType
+/* static */
+bool nsOSHelperAppService::typeFromExtEquals(const char16_t* aExt,
+ const char* aType) {
+ if (!aType) return false;
+ nsAutoString fileExtToUse;
+ if (aExt[0] != char16_t('.')) fileExtToUse = char16_t('.');
+
+ fileExtToUse.Append(aExt);
+
+ bool eq = false;
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return eq;
+
+ nsresult rv =
+ regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, fileExtToUse,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) return eq;
+
+ nsAutoString type;
+ rv = regKey->ReadStringValue(u"Content Type"_ns, type);
+ if (NS_SUCCEEDED(rv)) eq = type.LowerCaseEqualsASCII(aType);
+
+ return eq;
+}
+
+// The "real" name of a given helper app (as specified by the path to the
+// executable file held in various registry keys) is stored n the VERSIONINFO
+// block in the file's resources. We need to find the path to the executable
+// and then retrieve the "FileDescription" field value from the file.
+nsresult nsOSHelperAppService::GetDefaultAppInfo(
+ const nsAString& aAppInfo, nsAString& aDefaultDescription,
+ nsIFile** aDefaultApplication) {
+ nsAutoString handlerCommand;
+
+ // If all else fails, use the file type key name, which will be
+ // something like "pngfile" for .pngs, "WMVFile" for .wmvs, etc.
+ aDefaultDescription = aAppInfo;
+ *aDefaultApplication = nullptr;
+
+ if (aAppInfo.IsEmpty()) return NS_ERROR_FAILURE;
+
+ // aAppInfo may be a file, file path, program id, or
+ // Applications reference -
+ // c:\dir\app.exe
+ // Applications\appfile.exe/dll (shell\open...)
+ // ProgID.progid (shell\open...)
+
+ nsAutoString handlerKeyName(aAppInfo);
+
+ nsCOMPtr<nsIWindowsRegKey> chkKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!chkKey) return NS_ERROR_FAILURE;
+
+ nsresult rv =
+ chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, handlerKeyName,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) {
+ // It's a file system path to a handler
+ handlerCommand.Assign(aAppInfo);
+ } else {
+ handlerKeyName.AppendLiteral("\\shell\\open\\command");
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return NS_ERROR_FAILURE;
+
+ nsresult rv =
+ regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, handlerKeyName,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
+
+ // OK, the default value here is the description of the type.
+ rv = regKey->ReadStringValue(u""_ns, handlerCommand);
+ if (NS_FAILED(rv)) {
+ // Check if there is a DelegateExecute string
+ nsAutoString delegateExecute;
+ rv = regKey->ReadStringValue(u"DelegateExecute"_ns, delegateExecute);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // Look for InProcServer32
+ nsAutoString delegateExecuteRegPath;
+ delegateExecuteRegPath.AssignLiteral("CLSID\\");
+ delegateExecuteRegPath.Append(delegateExecute);
+ delegateExecuteRegPath.AppendLiteral("\\InProcServer32");
+ rv = chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+ delegateExecuteRegPath,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_SUCCEEDED(rv)) {
+ rv = chkKey->ReadStringValue(u""_ns, handlerCommand);
+ }
+
+ if (NS_FAILED(rv)) {
+ // Look for LocalServer32
+ delegateExecuteRegPath.AssignLiteral("CLSID\\");
+ delegateExecuteRegPath.Append(delegateExecute);
+ delegateExecuteRegPath.AppendLiteral("\\LocalServer32");
+ rv = chkKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT,
+ delegateExecuteRegPath,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ NS_ENSURE_SUCCESS(rv, rv);
+ rv = chkKey->ReadStringValue(u""_ns, handlerCommand);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ }
+ }
+
+ // XXX FIXME: If this fails, the UI will display the full command
+ // string.
+ // There are some rare cases this can happen - ["url.dll" -foo]
+ // for example won't resolve correctly to the system dir. The
+ // subsequent launch of the helper app will work though.
+ nsCOMPtr<nsILocalFileWin> lf = new nsLocalFile();
+ rv = lf->InitWithCommandLine(handlerCommand);
+ NS_ENSURE_SUCCESS(rv, rv);
+ lf.forget(aDefaultApplication);
+
+ wchar_t friendlyName[1024];
+ DWORD friendlyNameSize = 1024;
+ HRESULT hr = AssocQueryString(ASSOCF_NONE, ASSOCSTR_FRIENDLYAPPNAME,
+ PromiseFlatString(aAppInfo).get(), NULL,
+ friendlyName, &friendlyNameSize);
+ if (SUCCEEDED(hr) && friendlyNameSize > 1) {
+ aDefaultDescription.Assign(friendlyName, friendlyNameSize - 1);
+ }
+
+ return NS_OK;
+}
+
+already_AddRefed<nsMIMEInfoWin> nsOSHelperAppService::GetByExtension(
+ const nsString& aFileExt, const char* aTypeHint) {
+ if (aFileExt.IsEmpty()) return nullptr;
+
+ // Determine the mime type.
+ nsAutoCString typeToUse;
+ if (aTypeHint && *aTypeHint) {
+ typeToUse.Assign(aTypeHint);
+ } else if (!GetMIMETypeFromOSForExtension(NS_ConvertUTF16toUTF8(aFileExt),
+ typeToUse)) {
+ return nullptr;
+ }
+
+ RefPtr<nsMIMEInfoWin> mimeInfo = new nsMIMEInfoWin(typeToUse);
+
+ // Our extension APIs expect extensions without the '.', so normalize:
+ uint32_t dotlessIndex = aFileExt.First() != char16_t('.') ? 0 : 1;
+ nsAutoCString lowerFileExt =
+ NS_ConvertUTF16toUTF8(Substring(aFileExt, dotlessIndex));
+ ToLowerCase(lowerFileExt);
+ mimeInfo->AppendExtension(lowerFileExt);
+ mimeInfo->SetPreferredAction(nsIMIMEInfo::saveToDisk);
+
+ if (NS_FAILED(InternalSetDefaultsOnMIME(mimeInfo))) {
+ return nullptr;
+ }
+
+ return mimeInfo.forget();
+}
+
+nsresult nsOSHelperAppService::InternalSetDefaultsOnMIME(
+ nsMIMEInfoWin* aMIMEInfo) {
+ NS_ENSURE_ARG(aMIMEInfo);
+
+ nsAutoCString primaryExt;
+ aMIMEInfo->GetPrimaryExtension(primaryExt);
+
+ if (primaryExt.IsEmpty()) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // windows registry assumes your file extension is going to include the '.',
+ // but our APIs don't have it, so add it:
+ nsAutoString assocType = NS_ConvertUTF8toUTF16(primaryExt);
+ if (assocType.First() != char16_t('.')) {
+ assocType.Insert(char16_t('.'), 0);
+ }
+
+ nsAutoString appInfo;
+ bool found;
+
+ // Retrieve the default application for this extension
+ NS_ENSURE_TRUE(mAppAssoc, NS_ERROR_NOT_AVAILABLE);
+ wchar_t* pResult = nullptr;
+ HRESULT hr = mAppAssoc->QueryCurrentDefault(assocType.get(), AT_FILEEXTENSION,
+ AL_EFFECTIVE, &pResult);
+ if (SUCCEEDED(hr)) {
+ found = true;
+ appInfo.Assign(pResult);
+ CoTaskMemFree(pResult);
+ } else {
+ found = false;
+ }
+
+ // Bug 358297 - ignore the default handler, force the user to choose app
+ if (appInfo.EqualsLiteral("XPSViewer.Document")) found = false;
+
+ if (!found) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // Get other nsIMIMEInfo fields from registry, if possible.
+ nsAutoString defaultDescription;
+ nsCOMPtr<nsIFile> defaultApplication;
+
+ if (NS_FAILED(GetDefaultAppInfo(appInfo, defaultDescription,
+ getter_AddRefs(defaultApplication)))) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ aMIMEInfo->SetDefaultDescription(defaultDescription);
+ aMIMEInfo->SetDefaultApplicationHandler(defaultApplication);
+
+ // Grab the general description
+ GetMIMEInfoFromRegistry(appInfo, aMIMEInfo);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsOSHelperAppService::GetMIMEInfoFromOS(const nsACString& aMIMEType,
+ const nsACString& aFileExt,
+ bool* aFound, nsIMIMEInfo** aMIMEInfo) {
+ *aFound = false;
+
+ const nsCString& flatType = PromiseFlatCString(aMIMEType);
+ nsAutoString fileExtension;
+ CopyUTF8toUTF16(aFileExt, fileExtension);
+
+ /* XXX The octet-stream check is a gross hack to wallpaper over the most
+ * common Win32 extension issues caused by the fix for bug 116938. See bug
+ * 120327, comment 271 for why this is needed. Not even sure we
+ * want to remove this once we have fixed all this stuff to work
+ * right; any info we get from the OS on this type is pretty much
+ * useless....
+ */
+ bool haveMeaningfulMimeType =
+ !aMIMEType.IsEmpty() &&
+ !aMIMEType.LowerCaseEqualsLiteral(APPLICATION_OCTET_STREAM);
+ LOG("Extension lookup on '%S' with mimetype '%s'%s\n",
+ static_cast<const wchar_t*>(fileExtension.get()), flatType.get(),
+ haveMeaningfulMimeType ? " (treated as meaningful)" : "");
+
+ RefPtr<nsMIMEInfoWin> mi;
+
+ // We should have *something* to go on here.
+ nsAutoString extensionFromMimeType;
+ if (haveMeaningfulMimeType) {
+ GetExtensionFromWindowsMimeDatabase(aMIMEType, extensionFromMimeType);
+ }
+ if (fileExtension.IsEmpty() && extensionFromMimeType.IsEmpty()) {
+ // Without an extension from the mimetype or the file, we can't
+ // do anything here.
+ mi = new nsMIMEInfoWin(flatType.get());
+ mi.forget(aMIMEInfo);
+ return NS_OK;
+ }
+
+ // Either fileExtension or extensionFromMimeType must now be non-empty.
+
+ *aFound = true;
+
+ // On Windows, we prefer the file extension for lookups over the mimetype,
+ // because that's how windows does things.
+ // If we have no file extension or it doesn't match the mimetype, use the
+ // mime type's default file extension instead.
+ bool usedMimeTypeExtensionForLookup = false;
+ if (fileExtension.IsEmpty() ||
+ (!extensionFromMimeType.IsEmpty() &&
+ !typeFromExtEquals(fileExtension.get(), flatType.get()))) {
+ usedMimeTypeExtensionForLookup = true;
+ fileExtension = extensionFromMimeType;
+ LOG("Now using '%s' mimetype's default file extension '%S' for lookup\n",
+ flatType.get(), static_cast<const wchar_t*>(fileExtension.get()));
+ }
+
+ // If we have an extension, use it for lookup:
+ mi = GetByExtension(fileExtension, flatType.get());
+ LOG("Extension lookup on '%S' found: 0x%p\n",
+ static_cast<const wchar_t*>(fileExtension.get()), mi.get());
+
+ if (mi) {
+ bool hasDefault = false;
+ mi->GetHasDefaultHandler(&hasDefault);
+ // If we don't find a default handler description, see if we can find one
+ // using the mimetype.
+ if (!hasDefault && !usedMimeTypeExtensionForLookup) {
+ RefPtr<nsMIMEInfoWin> miFromMimeType =
+ GetByExtension(extensionFromMimeType, flatType.get());
+ LOG("Mime-based ext. lookup for '%S' found 0x%p\n",
+ static_cast<const wchar_t*>(extensionFromMimeType.get()),
+ miFromMimeType.get());
+ if (miFromMimeType) {
+ nsAutoString desc;
+ miFromMimeType->GetDefaultDescription(desc);
+ mi->SetDefaultDescription(desc);
+ }
+ }
+ mi.forget(aMIMEInfo);
+ return NS_OK;
+ }
+
+ // The extension didn't work. Try the extension from the mimetype if
+ // different:
+ if (!extensionFromMimeType.IsEmpty() && !usedMimeTypeExtensionForLookup) {
+ mi = GetByExtension(extensionFromMimeType, flatType.get());
+ LOG("Mime-based ext. lookup for '%S' found 0x%p\n",
+ static_cast<const wchar_t*>(extensionFromMimeType.get()), mi.get());
+ }
+ if (mi) {
+ mi.forget(aMIMEInfo);
+ return NS_OK;
+ }
+ // This didn't work either, so just return an empty dummy mimeinfo.
+ *aFound = false;
+ mi = new nsMIMEInfoWin(flatType.get());
+ // If we didn't resort to the mime type's extension, we must have had a
+ // valid extension, so stick its lowercase version on the mime info.
+ if (!usedMimeTypeExtensionForLookup) {
+ nsAutoCString lowerFileExt;
+ ToLowerCase(aFileExt, lowerFileExt);
+ mi->AppendExtension(lowerFileExt);
+ }
+ mi.forget(aMIMEInfo);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsOSHelperAppService::UpdateDefaultAppInfo(nsIMIMEInfo* aMIMEInfo) {
+ InternalSetDefaultsOnMIME(static_cast<nsMIMEInfoWin*>(aMIMEInfo));
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsOSHelperAppService::GetProtocolHandlerInfoFromOS(const nsACString& aScheme,
+ bool* found,
+ nsIHandlerInfo** _retval) {
+ NS_ASSERTION(!aScheme.IsEmpty(), "No scheme was specified!");
+
+ nsresult rv =
+ OSProtocolHandlerExists(nsPromiseFlatCString(aScheme).get(), found);
+ if (NS_FAILED(rv)) return rv;
+
+ nsMIMEInfoWin* handlerInfo =
+ new nsMIMEInfoWin(aScheme, nsMIMEInfoBase::eProtocolInfo);
+ NS_ENSURE_TRUE(handlerInfo, NS_ERROR_OUT_OF_MEMORY);
+ NS_ADDREF(*_retval = handlerInfo);
+
+ if (!*found) {
+ // Code that calls this requires an object regardless if the OS has
+ // something for us, so we return the empty object.
+ return NS_OK;
+ }
+
+ nsAutoString desc;
+ GetApplicationDescription(aScheme, desc);
+ handlerInfo->SetDefaultDescription(desc);
+
+ return NS_OK;
+}
+
+bool nsOSHelperAppService::GetMIMETypeFromOSForExtension(
+ const nsACString& aExtension, nsACString& aMIMEType) {
+ if (aExtension.IsEmpty()) return false;
+
+ // windows registry assumes your file extension is going to include the '.'.
+ // so make sure it's there...
+ nsAutoString fileExtToUse;
+ if (aExtension.First() != '.') fileExtToUse = char16_t('.');
+
+ AppendUTF8toUTF16(aExtension, fileExtToUse);
+
+ // Try to get an entry from the windows registry.
+ nsCOMPtr<nsIWindowsRegKey> regKey =
+ do_CreateInstance("@mozilla.org/windows-registry-key;1");
+ if (!regKey) return false;
+
+ nsresult rv =
+ regKey->Open(nsIWindowsRegKey::ROOT_KEY_CLASSES_ROOT, fileExtToUse,
+ nsIWindowsRegKey::ACCESS_QUERY_VALUE);
+ if (NS_FAILED(rv)) return false;
+
+ nsAutoString mimeType;
+ if (NS_FAILED(regKey->ReadStringValue(u"Content Type"_ns, mimeType)) ||
+ mimeType.IsEmpty()) {
+ return false;
+ }
+ // Content-Type is always in ASCII
+ aMIMEType.Truncate();
+ LossyAppendUTF16toASCII(mimeType, aMIMEType);
+ return true;
+}