Fix CefCommandLine character case requirements (fixes issue #1872)

Switch names will now be converted to lowercase ASCII on all platforms.
Switch values will retain the original case and UTF8 encoding.

include/capi/cef_command_line_capi.h

@@ -33,7 +33,7 @@
 // by hand. See the translator.README.txt file in the tools directory for
 // more information.
 //
-// $hash=5af5bf1e877dd53f21f751d332a9e2166817324c$
+// $hash=3ecebd6b30bb8fb837e062eacd021c1a1ff3620a$
 //
 
 #ifndef CEF_INCLUDE_CAPI_CEF_COMMAND_LINE_CAPI_H_
@@ -53,8 +53,9 @@ extern "C" {
 // optionally have a value specified using the '=' delimiter (e.g.
 // "-switch=value"). An argument of "--" will terminate switch parsing with all
 // subsequent tokens, regardless of prefix, being interpreted as non-switch
-// arguments. Switch names are considered case-insensitive. This structure can
-// be used before cef_initialize() is called.
+// arguments. Switch names should be lowercase ASCII and will be converted to
+// such if necessary. Switch values will retain the original case and UTF8
+// encoding. This structure can be used before cef_initialize() is called.
 ///
 typedef struct _cef_command_line_t {
   ///

include/cef_command_line.h

@@ -49,8 +49,9 @@
 // optionally have a value specified using the '=' delimiter (e.g.
 // "-switch=value"). An argument of "--" will terminate switch parsing with all
 // subsequent tokens, regardless of prefix, being interpreted as non-switch
-// arguments. Switch names are considered case-insensitive. This class can be
-// used before CefInitialize() is called.
+// arguments. Switch names should be lowercase ASCII and will be converted to
+// such if necessary. Switch values will retain the original case and UTF8
+// encoding. This class can be used before CefInitialize() is called.
 ///
 /*--cef(source=library,no_debugct_check)--*/
 class CefCommandLine : public virtual CefBaseRefCounted {

libcef/common/command_line_impl.cc

@@ -6,6 +6,7 @@
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
+#include "base/strings/string_util.h"
 
 CefCommandLineImpl::CefCommandLineImpl(base::CommandLine* value,
                                        bool will_delete,
@@ -90,12 +91,13 @@ bool CefCommandLineImpl::HasSwitches() {
 
 bool CefCommandLineImpl::HasSwitch(const CefString& name) {
   CEF_VALUE_VERIFY_RETURN(false, false);
-  return const_value().HasSwitch(name.ToString());
+  return const_value().HasSwitch(base::ToLowerASCII(name.ToString()));
 }
 
 CefString CefCommandLineImpl::GetSwitchValue(const CefString& name) {
   CEF_VALUE_VERIFY_RETURN(false, CefString());
-  return const_value().GetSwitchValueNative(name.ToString());
+  return const_value().GetSwitchValueNative(
+      base::ToLowerASCII(name.ToString()));
 }
 
 void CefCommandLineImpl::GetSwitches(SwitchMap& switches) {

patch/patch.cfg

@@ -483,6 +483,11 @@ patches = [
     # https://bitbucket.org/chromiumembedded/cef/issues/123
     'name': 'print_preview_123',
   },
+  {
+    # Store command-line switch names as lower-case ASCII on all platforms.
+    # https://bitbucket.org/chromiumembedded/cef/issues/1872
+    'name': 'base_command_line_1872',
+  },
   {
     # Remove cef_sandbox dependency on boringssl MD5/SHA1 functions.
     # https://bitbucket.org/chromiumembedded/cef/issues/2743

patch/patches/base_command_line_1872.patch

@@ -0,0 +1,17 @@
+diff --git base/command_line.cc base/command_line.cc
+index 3ef2e87e40687..f7b91a202a377 100644
+--- base/command_line.cc
++++ base/command_line.cc
+@@ -333,11 +333,10 @@ void CommandLine::AppendSwitchPath(StringPiece switch_string,
+ 
+ void CommandLine::AppendSwitchNative(StringPiece switch_string,
+                                      CommandLine::StringPieceType value) {
+-#if defined(OS_WIN)
+   const std::string switch_key = ToLowerASCII(switch_string);
++#if defined(OS_WIN)
+   StringType combined_switch_string(UTF8ToWide(switch_key));
+ #elif defined(OS_POSIX) || defined(OS_FUCHSIA)
+-  StringPiece switch_key = switch_string;
+   StringType combined_switch_string(switch_key);
+ #endif
+   size_t prefix_length = GetSwitchPrefixLength(combined_switch_string);

tests/ceftests/command_line_unittest.cc

@@ -18,9 +18,10 @@ void VerifyCommandLine(CefRefPtr<CefCommandLine> command_line,
   EXPECT_TRUE(command_line->HasSwitch("switch1"));
   std::string switch1 = command_line->GetSwitchValue("switch1");
   EXPECT_EQ("", switch1);
-  EXPECT_TRUE(command_line->HasSwitch("switch2"));
-  std::string switch2 = command_line->GetSwitchValue("switch2");
-  EXPECT_EQ("val2", switch2);
+  // Switch names are converted to lowercase but values are left unchanged.
+  EXPECT_TRUE(command_line->HasSwitch("SWITCH2"));
+  std::string switch2 = command_line->GetSwitchValue("SWITCH2");
+  EXPECT_EQ("VAL2", switch2);
   EXPECT_TRUE(command_line->HasSwitch("switch3"));
   std::string switch3 = command_line->GetSwitchValue("switch3");
   EXPECT_EQ("val3", switch3);
@@ -45,7 +46,7 @@ void VerifyCommandLine(CefRefPtr<CefCommandLine> command_line,
       EXPECT_EQ("", val);
     } else if (name == "switch2") {
       has2 = true;
-      EXPECT_EQ("val2", val);
+      EXPECT_EQ("VAL2", val);
     } else if (name == "switch3") {
       has3 = true;
       EXPECT_EQ("val3", val);
@@ -86,10 +87,10 @@ TEST(CommandLineTest, Init) {
 
 #if defined(OS_WIN)
   command_line->InitFromString(
-      "test.exe --switch1 -switch2=val2 /switch3=val3 "
+      "test.exe --switch1 -switch2=VAL2 /switch3=val3 "
       "-switch4=\"val 4\" arg1 \"arg 2\"");
 #else
-  const char* args[] = {"test.exe",      "--switch1",      "-switch2=val2",
+  const char* args[] = {"test.exe",      "--switch1",      "-switch2=VAL2",
                         "-switch3=val3", "-switch4=val 4", "arg1",
                         "arg 2"};
   command_line->InitFromArgv(sizeof(args) / sizeof(char*), args);
@@ -105,7 +106,7 @@ TEST(CommandLineTest, Manual) {
 
   command_line->SetProgram("test.exe");
   command_line->AppendSwitch("switch1");
-  command_line->AppendSwitchWithValue("switch2", "val2");
+  command_line->AppendSwitchWithValue("switch2", "VAL2");
   command_line->AppendSwitchWithValue("switch3", "val3");
   command_line->AppendSwitchWithValue("switch4", "val 4");
   command_line->AppendArgument("arg1");
@@ -121,7 +122,7 @@ TEST(CommandLineTest, IgnorePrefixes) {
 
   command_line->SetProgram("test.exe");
   command_line->AppendSwitch("-switch1");
-  command_line->AppendSwitchWithValue("--switch2", "val2");
+  command_line->AppendSwitchWithValue("--switch2", "VAL2");
   command_line->AppendSwitchWithValue("-switch3", "val3");
   command_line->AppendSwitchWithValue("-switch4", "val 4");
 
@@ -133,3 +134,19 @@ TEST(CommandLineTest, IgnorePrefixes) {
 
   VerifyCommandLine(command_line, arg1, arg2);
 }
+
+// Test that command line switch names are converted to lowercase ASCII.
+TEST(CommandLineTest, IgnoreCase) {
+  CefRefPtr<CefCommandLine> command_line = CefCommandLine::CreateCommandLine();
+  EXPECT_TRUE(command_line.get() != nullptr);
+
+  command_line->SetProgram("test.exe");
+  command_line->AppendSwitch("-Switch1");
+  command_line->AppendSwitchWithValue("-SWITCH2", "VAL2");
+  command_line->AppendSwitchWithValue("-switch3", "val3");
+  command_line->AppendSwitchWithValue("-switch4", "val 4");
+  command_line->AppendArgument("arg1");
+  command_line->AppendArgument("arg 2");
+
+  VerifyCommandLine(command_line);
+}