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https://github.com/RGBCube/serenity
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LibJS: Implement the encode/decodeURI(Component) family of functions
These are generally useful and in particular needed for twitter.com
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5 changed files with 187 additions and 0 deletions
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@ -25,6 +25,8 @@
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Hex.h>
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#include <AK/Platform.h>
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#include <AK/TemporaryChange.h>
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#include <AK/Utf8View.h>
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#include <LibJS/Console.h>
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@ -126,6 +128,10 @@ void GlobalObject::initialize_global_object()
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define_native_function(vm.names.parseFloat, parse_float, 1, attr);
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define_native_function(vm.names.parseInt, parse_int, 1, attr);
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define_native_function(vm.names.eval, eval, 1, attr);
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define_native_function(vm.names.encodeURI, encode_uri, 1, attr);
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define_native_function(vm.names.decodeURI, decode_uri, 1, attr);
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define_native_function(vm.names.encodeURIComponent, encode_uri_component, 1, attr);
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define_native_function(vm.names.decodeURIComponent, decode_uri_component, 1, attr);
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define_property(vm.names.NaN, js_nan(), 0);
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define_property(vm.names.Infinity, js_infinity(), 0);
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@ -340,4 +346,117 @@ JS_DEFINE_NATIVE_FUNCTION(GlobalObject::eval)
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return vm.last_value();
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}
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// 19.2.6.1.1 Encode ( string, unescapedSet )
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static String encode([[maybe_unused]] JS::GlobalObject& global_object, const String& string, StringView unescaped_set)
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{
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StringBuilder encoded_builder;
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for (unsigned char code_unit : string) {
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if (unescaped_set.contains(code_unit)) {
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encoded_builder.append(code_unit);
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continue;
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}
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// FIXME: check for unpaired surrogates and throw URIError
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encoded_builder.appendff("%{:02X}", code_unit);
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}
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return encoded_builder.build();
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}
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// 19.2.6.1.2 Decode ( string, reservedSet )
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static String decode(JS::GlobalObject& global_object, const String& string, StringView reserved_set)
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{
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StringBuilder decoded_builder;
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auto expected_continuation_bytes = 0;
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for (size_t k = 0; k < string.length(); k++) {
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auto code_unit = string[k];
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if (code_unit != '%') {
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if (expected_continuation_bytes > 0) {
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global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
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return {};
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}
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decoded_builder.append(code_unit);
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continue;
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}
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if (k + 2 >= string.length()) {
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global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
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return {};
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}
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auto first_digit = decode_hex_digit(string[k + 1]);
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if (first_digit >= 16) {
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global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
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return {};
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}
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auto second_digit = decode_hex_digit(string[k + 2]);
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if (second_digit >= 16) {
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global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
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return {};
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}
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char decoded_code_unit = (first_digit << 4) | second_digit;
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k += 2;
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if (expected_continuation_bytes > 0) {
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decoded_builder.append(decoded_code_unit);
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expected_continuation_bytes--;
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continue;
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}
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if ((decoded_code_unit & 0x80) == 0) {
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if (reserved_set.contains(decoded_code_unit))
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decoded_builder.append(string.substring_view(k - 2, 3));
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else
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decoded_builder.append(decoded_code_unit);
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continue;
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}
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auto leading_ones = count_trailing_zeroes_32_safe(~decoded_code_unit) - 24;
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if (leading_ones == 1 || leading_ones > 4) {
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global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
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return {};
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}
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decoded_builder.append(decoded_code_unit);
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expected_continuation_bytes = leading_ones - 1;
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}
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return decoded_builder.build();
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}
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JS_DEFINE_NATIVE_FUNCTION(GlobalObject::encode_uri)
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{
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auto uri_string = vm.argument(0).to_string(global_object);
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if (vm.exception())
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return {};
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auto encoded = encode(global_object, uri_string, ";/?:@&=+$,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()#"sv);
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if (vm.exception())
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return {};
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return js_string(vm, move(encoded));
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}
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JS_DEFINE_NATIVE_FUNCTION(GlobalObject::decode_uri)
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{
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auto uri_string = vm.argument(0).to_string(global_object);
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if (vm.exception())
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return {};
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auto decoded = decode(global_object, uri_string, ";/?:@&=+$,#"sv);
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if (vm.exception())
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return {};
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return js_string(vm, move(decoded));
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}
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JS_DEFINE_NATIVE_FUNCTION(GlobalObject::encode_uri_component)
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{
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auto uri_string = vm.argument(0).to_string(global_object);
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if (vm.exception())
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return {};
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auto encoded = encode(global_object, uri_string, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()"sv);
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if (vm.exception())
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return {};
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return js_string(vm, move(encoded));
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}
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JS_DEFINE_NATIVE_FUNCTION(GlobalObject::decode_uri_component)
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{
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auto uri_string = vm.argument(0).to_string(global_object);
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if (vm.exception())
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return {};
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auto decoded = decode(global_object, uri_string, ""sv);
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if (vm.exception())
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return {};
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return js_string(vm, move(decoded));
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}
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}
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