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node_url.cc
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#include "node_url.h"
#include "base_object-inl.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_i18n.h"
#include "util-inl.h"
#include <cmath>
#include <cstdio>
#include <numeric>
#include <string>
#include <vector>
namespace node {
using errors::TryCatchScope;
using url::table_data::hex;
using url::table_data::C0_CONTROL_ENCODE_SET;
using url::table_data::FRAGMENT_ENCODE_SET;
using url::table_data::PATH_ENCODE_SET;
using url::table_data::USERINFO_ENCODE_SET;
using url::table_data::QUERY_ENCODE_SET_NONSPECIAL;
using url::table_data::QUERY_ENCODE_SET_SPECIAL;
using v8::Array;
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Null;
using v8::Object;
using v8::String;
using v8::Undefined;
using v8::Value;
Local<String> Utf8String(Isolate* isolate, const std::string& str) {
return String::NewFromUtf8(isolate,
str.data(),
NewStringType::kNormal,
str.length()).ToLocalChecked();
}
namespace url {
namespace {
// https://url.spec.whatwg.org/#eof-code-point
constexpr char kEOL = -1;
// https://url.spec.whatwg.org/#concept-host
class URLHost {
public:
~URLHost();
void ParseIPv4Host(const char* input, size_t length, bool* is_ipv4);
void ParseIPv6Host(const char* input, size_t length);
void ParseOpaqueHost(const char* input, size_t length);
void ParseHost(const char* input,
size_t length,
bool is_special,
bool unicode = false);
bool ParsingFailed() const { return type_ == HostType::H_FAILED; }
std::string ToString() const;
// Like ToString(), but avoids a copy in exchange for invalidating `*this`.
std::string ToStringMove();
private:
enum class HostType {
H_FAILED,
H_DOMAIN,
H_IPV4,
H_IPV6,
H_OPAQUE,
};
union Value {
std::string domain_or_opaque;
uint32_t ipv4;
uint16_t ipv6[8];
~Value() {}
Value() : ipv4(0) {}
};
Value value_;
HostType type_ = HostType::H_FAILED;
void Reset() {
using string = std::string;
switch (type_) {
case HostType::H_DOMAIN:
case HostType::H_OPAQUE:
value_.domain_or_opaque.~string();
break;
default:
break;
}
type_ = HostType::H_FAILED;
}
// Setting the string members of the union with = is brittle because
// it relies on them being initialized to a state that requires no
// destruction of old data.
// For a long time, that worked well enough because ParseIPv6Host() happens
// to zero-fill `value_`, but that really is relying on standard library
// internals too much.
// These helpers are the easiest solution but we might want to consider
// just not forcing strings into an union.
void SetOpaque(std::string&& string) {
Reset();
type_ = HostType::H_OPAQUE;
new(&value_.domain_or_opaque) std::string(std::move(string));
}
void SetDomain(std::string&& string) {
Reset();
type_ = HostType::H_DOMAIN;
new(&value_.domain_or_opaque) std::string(std::move(string));
}
};
URLHost::~URLHost() {
Reset();
}
#define ARGS(XX) \
XX(ARG_FLAGS) \
XX(ARG_PROTOCOL) \
XX(ARG_USERNAME) \
XX(ARG_PASSWORD) \
XX(ARG_HOST) \
XX(ARG_PORT) \
XX(ARG_PATH) \
XX(ARG_QUERY) \
XX(ARG_FRAGMENT) \
XX(ARG_COUNT) // This one has to be last.
enum url_cb_args {
#define XX(name) name,
ARGS(XX)
#undef XX
};
#define TWO_CHAR_STRING_TEST(bits, name, expr) \
template <typename T> \
bool name(const T ch1, const T ch2) { \
static_assert(sizeof(ch1) >= (bits) / 8, \
"Character must be wider than " #bits " bits"); \
return (expr); \
} \
template <typename T> \
bool name(const std::basic_string<T>& str) { \
static_assert(sizeof(str[0]) >= (bits) / 8, \
"Character must be wider than " #bits " bits"); \
return str.length() >= 2 && name(str[0], str[1]); \
}
// https://infra.spec.whatwg.org/#ascii-tab-or-newline
CHAR_TEST(8, IsASCIITabOrNewline, (ch == '\t' || ch == '\n' || ch == '\r'))
// https://infra.spec.whatwg.org/#c0-control-or-space
CHAR_TEST(8, IsC0ControlOrSpace, (ch >= '\0' && ch <= ' '))
// https://infra.spec.whatwg.org/#ascii-digit
CHAR_TEST(8, IsASCIIDigit, (ch >= '0' && ch <= '9'))
// https://infra.spec.whatwg.org/#ascii-hex-digit
CHAR_TEST(8, IsASCIIHexDigit, (IsASCIIDigit(ch) ||
(ch >= 'A' && ch <= 'F') ||
(ch >= 'a' && ch <= 'f')))
// https://infra.spec.whatwg.org/#ascii-alpha
CHAR_TEST(8, IsASCIIAlpha, ((ch >= 'A' && ch <= 'Z') ||
(ch >= 'a' && ch <= 'z')))
// https://infra.spec.whatwg.org/#ascii-alphanumeric
CHAR_TEST(8, IsASCIIAlphanumeric, (IsASCIIDigit(ch) || IsASCIIAlpha(ch)))
// https://infra.spec.whatwg.org/#ascii-lowercase
template <typename T>
T ASCIILowercase(T ch) {
return IsASCIIAlpha(ch) ? (ch | 0x20) : ch;
}
// https://url.spec.whatwg.org/#forbidden-host-code-point
CHAR_TEST(8, IsForbiddenHostCodePoint,
ch == '\0' || ch == '\t' || ch == '\n' || ch == '\r' ||
ch == ' ' || ch == '#' || ch == '%' || ch == '/' ||
ch == ':' || ch == '?' || ch == '@' || ch == '[' ||
ch == '<' || ch == '>' || ch == '\\' || ch == ']' ||
ch == '^' || ch == '|')
// https://url.spec.whatwg.org/#windows-drive-letter
TWO_CHAR_STRING_TEST(8, IsWindowsDriveLetter,
(IsASCIIAlpha(ch1) && (ch2 == ':' || ch2 == '|')))
// https://url.spec.whatwg.org/#normalized-windows-drive-letter
TWO_CHAR_STRING_TEST(8, IsNormalizedWindowsDriveLetter,
(IsASCIIAlpha(ch1) && ch2 == ':'))
#undef TWO_CHAR_STRING_TEST
bool BitAt(const uint8_t a[], const uint8_t i) {
return !!(a[i >> 3] & (1 << (i & 7)));
}
// Appends ch to str. If ch position in encode_set is set, the ch will
// be percent-encoded then appended.
void AppendOrEscape(std::string* str,
const unsigned char ch,
const uint8_t encode_set[]) {
if (BitAt(encode_set, ch))
*str += hex + ch * 4; // "%XX\0" has a length of 4
else
*str += ch;
}
unsigned hex2bin(const char ch) {
if (ch >= '0' && ch <= '9')
return ch - '0';
if (ch >= 'A' && ch <= 'F')
return 10 + (ch - 'A');
if (ch >= 'a' && ch <= 'f')
return 10 + (ch - 'a');
UNREACHABLE();
}
std::string PercentDecode(const char* input, size_t len) {
std::string dest;
if (len == 0)
return dest;
dest.reserve(len);
const char* pointer = input;
const char* end = input + len;
while (pointer < end) {
const char ch = pointer[0];
size_t remaining = end - pointer - 1;
if (ch != '%' || remaining < 2 ||
(ch == '%' &&
(!IsASCIIHexDigit(pointer[1]) ||
!IsASCIIHexDigit(pointer[2])))) {
dest += ch;
pointer++;
continue;
} else {
unsigned a = hex2bin(pointer[1]);
unsigned b = hex2bin(pointer[2]);
char c = static_cast<char>(a * 16 + b);
dest += c;
pointer += 3;
}
}
return dest;
}
#define SPECIALS(XX) \
XX(ftp, 21, "ftp:") \
XX(file, -1, "file:") \
XX(http, 80, "http:") \
XX(https, 443, "https:") \
XX(ws, 80, "ws:") \
XX(wss, 443, "wss:")
bool IsSpecial(const std::string& scheme) {
#define V(_, __, name) if (scheme == name) return true;
SPECIALS(V);
#undef V
return false;
}
Local<String> GetSpecial(Environment* env, const std::string& scheme) {
#define V(key, _, name) if (scheme == name) \
return env->url_special_##key##_string();
SPECIALS(V)
#undef V
UNREACHABLE();
}
int NormalizePort(const std::string& scheme, int p) {
#define V(_, port, name) if (scheme == name && p == port) return -1;
SPECIALS(V);
#undef V
return p;
}
// https://url.spec.whatwg.org/#start-with-a-windows-drive-letter
bool StartsWithWindowsDriveLetter(const char* p, const char* end) {
size_t length = end - p;
return length >= 2 &&
IsWindowsDriveLetter(p[0], p[1]) &&
(length == 2 ||
p[2] == '/' ||
p[2] == '\\' ||
p[2] == '?' ||
p[2] == '#');
}
#if defined(NODE_HAVE_I18N_SUPPORT)
bool ToUnicode(const std::string& input, std::string* output) {
MaybeStackBuffer<char> buf;
if (i18n::ToUnicode(&buf, input.c_str(), input.length()) < 0)
return false;
output->assign(*buf, buf.length());
return true;
}
bool ToASCII(const std::string& input, std::string* output) {
MaybeStackBuffer<char> buf;
if (i18n::ToASCII(&buf, input.c_str(), input.length()) < 0)
return false;
if (buf.length() == 0)
return false;
output->assign(*buf, buf.length());
return true;
}
#else // !defined(NODE_HAVE_I18N_SUPPORT)
// Intentional non-ops if ICU is not present.
bool ToUnicode(const std::string& input, std::string* output) {
*output = input;
return true;
}
bool ToASCII(const std::string& input, std::string* output) {
*output = input;
return true;
}
#endif // !defined(NODE_HAVE_I18N_SUPPORT)
#define NS_IN6ADDRSZ 16
void URLHost::ParseIPv6Host(const char* input, size_t length) {
CHECK_EQ(type_, HostType::H_FAILED);
unsigned char buf[sizeof(struct in6_addr)];
MaybeStackBuffer<char> ipv6(length + 1);
*(*ipv6 + length) = 0;
memset(buf, 0, sizeof(buf));
memcpy(*ipv6, input, sizeof(const char) * length);
int ret = uv_inet_pton(AF_INET6, *ipv6, buf);
if (ret != 0) {
return;
}
// Ref: https://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/inet_ntop.c;h=c4d38c0f951013e51a4fc6eaa8a9b82e146abe5a;hb=HEAD#l119
for (int i = 0; i < NS_IN6ADDRSZ; i += 2) {
value_.ipv6[i >> 1] = (buf[i] << 8) | buf[i + 1];
}
type_ = HostType::H_IPV6;
}
int64_t ParseNumber(const char* start, const char* end) {
unsigned R = 10;
if (end - start >= 2 && start[0] == '0' && (start[1] | 0x20) == 'x') {
start += 2;
R = 16;
}
if (end - start == 0) {
return 0;
} else if (R == 10 && end - start > 1 && start[0] == '0') {
start++;
R = 8;
}
const char* p = start;
while (p < end) {
const char ch = p[0];
switch (R) {
case 8:
if (ch < '0' || ch > '7')
return -1;
break;
case 10:
if (!IsASCIIDigit(ch))
return -1;
break;
case 16:
if (!IsASCIIHexDigit(ch))
return -1;
break;
}
p++;
}
return strtoll(start, nullptr, R);
}
void URLHost::ParseIPv4Host(const char* input, size_t length, bool* is_ipv4) {
CHECK_EQ(type_, HostType::H_FAILED);
*is_ipv4 = false;
const char* pointer = input;
const char* mark = input;
const char* end = pointer + length;
int parts = 0;
uint32_t val = 0;
uint64_t numbers[4];
int tooBigNumbers = 0;
if (length == 0)
return;
while (pointer <= end) {
const char ch = pointer < end ? pointer[0] : kEOL;
int64_t remaining = end - pointer - 1;
if (ch == '.' || ch == kEOL) {
if (++parts > static_cast<int>(arraysize(numbers))) return;
if (pointer == mark)
return;
int64_t n = ParseNumber(mark, pointer);
if (n < 0)
return;
if (n > 255) {
tooBigNumbers++;
}
numbers[parts - 1] = n;
mark = pointer + 1;
if (ch == '.' && remaining == 0)
break;
}
pointer++;
}
CHECK_GT(parts, 0);
*is_ipv4 = true;
// If any but the last item in numbers is greater than 255, return failure.
// If the last item in numbers is greater than or equal to
// 256^(5 - the number of items in numbers), return failure.
if (tooBigNumbers > 1 ||
(tooBigNumbers == 1 && numbers[parts - 1] <= 255) ||
numbers[parts - 1] >= pow(256, static_cast<double>(5 - parts))) {
return;
}
type_ = HostType::H_IPV4;
val = static_cast<uint32_t>(numbers[parts - 1]);
for (int n = 0; n < parts - 1; n++) {
double b = 3 - n;
val +=
static_cast<uint32_t>(numbers[n]) * static_cast<uint32_t>(pow(256, b));
}
value_.ipv4 = val;
}
void URLHost::ParseOpaqueHost(const char* input, size_t length) {
CHECK_EQ(type_, HostType::H_FAILED);
std::string output;
output.reserve(length);
for (size_t i = 0; i < length; i++) {
const char ch = input[i];
if (ch != '%' && IsForbiddenHostCodePoint(ch)) {
return;
} else {
AppendOrEscape(&output, ch, C0_CONTROL_ENCODE_SET);
}
}
SetOpaque(std::move(output));
}
void URLHost::ParseHost(const char* input,
size_t length,
bool is_special,
bool unicode) {
CHECK_EQ(type_, HostType::H_FAILED);
const char* pointer = input;
if (length == 0)
return;
if (pointer[0] == '[') {
if (pointer[length - 1] != ']')
return;
return ParseIPv6Host(++pointer, length - 2);
}
if (!is_special)
return ParseOpaqueHost(input, length);
// First, we have to percent decode
std::string decoded = PercentDecode(input, length);
// Then we have to punycode toASCII
if (!ToASCII(decoded, &decoded))
return;
// If any of the following characters are still present, we have to fail
for (size_t n = 0; n < decoded.size(); n++) {
const char ch = decoded[n];
if (IsForbiddenHostCodePoint(ch)) {
return;
}
}
// Check to see if it's an IPv4 IP address
bool is_ipv4;
ParseIPv4Host(decoded.c_str(), decoded.length(), &is_ipv4);
if (is_ipv4)
return;
// If the unicode flag is set, run the result through punycode ToUnicode
if (unicode && !ToUnicode(decoded, &decoded))
return;
// It's not an IPv4 or IPv6 address, it must be a domain
SetDomain(std::move(decoded));
}
// Locates the longest sequence of 0 segments in an IPv6 address
// in order to use the :: compression when serializing
template <typename T>
T* FindLongestZeroSequence(T* values, size_t len) {
T* start = values;
T* end = start + len;
T* result = nullptr;
T* current = nullptr;
unsigned counter = 0, longest = 1;
while (start < end) {
if (*start == 0) {
if (current == nullptr)
current = start;
counter++;
} else {
if (counter > longest) {
longest = counter;
result = current;
}
counter = 0;
current = nullptr;
}
start++;
}
if (counter > longest)
result = current;
return result;
}
std::string URLHost::ToStringMove() {
std::string return_value;
switch (type_) {
case HostType::H_DOMAIN:
case HostType::H_OPAQUE:
return_value = std::move(value_.domain_or_opaque);
break;
default:
return_value = ToString();
break;
}
Reset();
return return_value;
}
std::string URLHost::ToString() const {
std::string dest;
switch (type_) {
case HostType::H_DOMAIN:
case HostType::H_OPAQUE:
return value_.domain_or_opaque;
case HostType::H_IPV4: {
dest.reserve(15);
uint32_t value = value_.ipv4;
for (int n = 0; n < 4; n++) {
dest.insert(0, std::to_string(value % 256));
if (n < 3)
dest.insert(0, 1, '.');
value /= 256;
}
break;
}
case HostType::H_IPV6: {
dest.reserve(41);
dest += '[';
const uint16_t* start = &value_.ipv6[0];
const uint16_t* compress_pointer =
FindLongestZeroSequence(start, 8);
bool ignore0 = false;
for (int n = 0; n <= 7; n++) {
const uint16_t* piece = &value_.ipv6[n];
if (ignore0 && *piece == 0)
continue;
else if (ignore0)
ignore0 = false;
if (compress_pointer == piece) {
dest += n == 0 ? "::" : ":";
ignore0 = true;
continue;
}
char buf[5];
snprintf(buf, sizeof(buf), "%x", *piece);
dest += buf;
if (n < 7)
dest += ':';
}
dest += ']';
break;
}
case HostType::H_FAILED:
break;
}
return dest;
}
bool ParseHost(const std::string& input,
std::string* output,
bool is_special,
bool unicode = false) {
if (input.empty()) {
output->clear();
return true;
}
URLHost host;
host.ParseHost(input.c_str(), input.length(), is_special, unicode);
if (host.ParsingFailed())
return false;
*output = host.ToStringMove();
return true;
}
std::vector<std::string> FromJSStringArray(Environment* env,
Local<Array> array) {
std::vector<std::string> vec;
if (array->Length() > 0)
vec.reserve(array->Length());
for (size_t n = 0; n < array->Length(); n++) {
Local<Value> val = array->Get(env->context(), n).ToLocalChecked();
if (val->IsString()) {
Utf8Value value(env->isolate(), val.As<String>());
vec.emplace_back(*value, value.length());
}
}
return vec;
}
url_data HarvestBase(Environment* env, Local<Object> base_obj) {
url_data base;
Local<Context> context = env->context();
Local<Value> flags =
base_obj->Get(env->context(), env->flags_string()).ToLocalChecked();
if (flags->IsInt32())
base.flags = flags->Int32Value(context).FromJust();
Local<Value> port =
base_obj->Get(env->context(), env->port_string()).ToLocalChecked();
if (port->IsInt32())
base.port = port->Int32Value(context).FromJust();
Local<Value> scheme =
base_obj->Get(env->context(), env->scheme_string()).ToLocalChecked();
base.scheme = Utf8Value(env->isolate(), scheme).out();
auto GetStr = [&](std::string url_data::*member,
int flag,
Local<String> name,
bool empty_as_present) {
Local<Value> value = base_obj->Get(env->context(), name).ToLocalChecked();
if (value->IsString()) {
Utf8Value utf8value(env->isolate(), value.As<String>());
(base.*member).assign(*utf8value, utf8value.length());
if (empty_as_present || value.As<String>()->Length() != 0) {
base.flags |= flag;
}
}
};
GetStr(&url_data::username,
URL_FLAGS_HAS_USERNAME,
env->username_string(),
false);
GetStr(&url_data::password,
URL_FLAGS_HAS_PASSWORD,
env->password_string(),
false);
GetStr(&url_data::host, URL_FLAGS_HAS_HOST, env->host_string(), true);
GetStr(&url_data::query, URL_FLAGS_HAS_QUERY, env->query_string(), true);
GetStr(&url_data::fragment,
URL_FLAGS_HAS_FRAGMENT,
env->fragment_string(),
true);
Local<Value>
path = base_obj->Get(env->context(), env->path_string()).ToLocalChecked();
if (path->IsArray()) {
base.flags |= URL_FLAGS_HAS_PATH;
base.path = FromJSStringArray(env, path.As<Array>());
}
return base;
}
url_data HarvestContext(Environment* env, Local<Object> context_obj) {
url_data context;
Local<Value> flags =
context_obj->Get(env->context(), env->flags_string()).ToLocalChecked();
if (flags->IsInt32()) {
static constexpr int32_t kCopyFlagsMask =
URL_FLAGS_SPECIAL |
URL_FLAGS_CANNOT_BE_BASE |
URL_FLAGS_HAS_USERNAME |
URL_FLAGS_HAS_PASSWORD |
URL_FLAGS_HAS_HOST;
context.flags |= flags.As<Int32>()->Value() & kCopyFlagsMask;
}
Local<Value> scheme =
context_obj->Get(env->context(), env->scheme_string()).ToLocalChecked();
if (scheme->IsString()) {
Utf8Value value(env->isolate(), scheme);
context.scheme.assign(*value, value.length());
}
Local<Value> port =
context_obj->Get(env->context(), env->port_string()).ToLocalChecked();
if (port->IsInt32())
context.port = port.As<Int32>()->Value();
if (context.flags & URL_FLAGS_HAS_USERNAME) {
Local<Value> username =
context_obj->Get(env->context(),
env->username_string()).ToLocalChecked();
CHECK(username->IsString());
Utf8Value value(env->isolate(), username);
context.username.assign(*value, value.length());
}
if (context.flags & URL_FLAGS_HAS_PASSWORD) {
Local<Value> password =
context_obj->Get(env->context(),
env->password_string()).ToLocalChecked();
CHECK(password->IsString());
Utf8Value value(env->isolate(), password);
context.password.assign(*value, value.length());
}
Local<Value> host =
context_obj->Get(env->context(),
env->host_string()).ToLocalChecked();
if (host->IsString()) {
Utf8Value value(env->isolate(), host);
context.host.assign(*value, value.length());
}
return context;
}
// Single dot segment can be ".", "%2e", or "%2E"
bool IsSingleDotSegment(const std::string& str) {
switch (str.size()) {
case 1:
return str == ".";
case 3:
return str[0] == '%' &&
str[1] == '2' &&
ASCIILowercase(str[2]) == 'e';
default:
return false;
}
}
// Double dot segment can be:
// "..", ".%2e", ".%2E", "%2e.", "%2E.",
// "%2e%2e", "%2E%2E", "%2e%2E", or "%2E%2e"
bool IsDoubleDotSegment(const std::string& str) {
switch (str.size()) {
case 2:
return str == "..";
case 4:
if (str[0] != '.' && str[0] != '%')
return false;
return ((str[0] == '.' &&
str[1] == '%' &&
str[2] == '2' &&
ASCIILowercase(str[3]) == 'e') ||
(str[0] == '%' &&
str[1] == '2' &&
ASCIILowercase(str[2]) == 'e' &&
str[3] == '.'));
case 6:
return (str[0] == '%' &&
str[1] == '2' &&
ASCIILowercase(str[2]) == 'e' &&
str[3] == '%' &&
str[4] == '2' &&
ASCIILowercase(str[5]) == 'e');
default:
return false;
}
}
void ShortenUrlPath(struct url_data* url) {
if (url->path.empty()) return;
if (url->path.size() == 1 && url->scheme == "file:" &&
IsNormalizedWindowsDriveLetter(url->path[0])) return;
url->path.pop_back();
}
} // anonymous namespace
void URL::Parse(const char* input,
size_t len,
enum url_parse_state state_override,
struct url_data* url,
bool has_url,
const struct url_data* base,
bool has_base) {
const char* p = input;
const char* end = input + len;
if (!has_url) {
for (const char* ptr = p; ptr < end; ptr++) {
if (IsC0ControlOrSpace(*ptr))
p++;
else
break;
}
for (const char* ptr = end - 1; ptr >= p; ptr--) {
if (IsC0ControlOrSpace(*ptr))
end--;
else
break;
}
input = p;
len = end - p;
}
// The spec says we should strip out any ASCII tabs or newlines.
// In those cases, we create another std::string instance with the filtered
// contents, but in the general case we avoid the overhead.
std::string whitespace_stripped;
for (const char* ptr = p; ptr < end; ptr++) {
if (!IsASCIITabOrNewline(*ptr))
continue;
// Hit tab or newline. Allocate storage, copy what we have until now,
// and then iterate and filter all similar characters out.
whitespace_stripped.reserve(len - 1);
whitespace_stripped.assign(p, ptr - p);
// 'ptr + 1' skips the current char, which we know to be tab or newline.
for (ptr = ptr + 1; ptr < end; ptr++) {
if (!IsASCIITabOrNewline(*ptr))
whitespace_stripped += *ptr;
}
// Update variables like they should have looked like if the string
// had been stripped of whitespace to begin with.
input = whitespace_stripped.c_str();
len = whitespace_stripped.size();
p = input;
end = input + len;
break;
}
bool atflag = false; // Set when @ has been seen.
bool square_bracket_flag = false; // Set inside of [...]
bool password_token_seen_flag = false; // Set after a : after an username.
std::string buffer;
// Set the initial parse state.
const bool has_state_override = state_override != kUnknownState;
enum url_parse_state state = has_state_override ? state_override :
kSchemeStart;
if (state < kSchemeStart || state > kFragment) {
url->flags |= URL_FLAGS_INVALID_PARSE_STATE;
return;
}
while (p <= end) {
const char ch = p < end ? p[0] : kEOL;
bool special = (url->flags & URL_FLAGS_SPECIAL);
bool cannot_be_base;
bool special_back_slash = (special && ch == '\\');
switch (state) {
case kSchemeStart:
if (IsASCIIAlpha(ch)) {
buffer += ASCIILowercase(ch);
state = kScheme;
} else if (!has_state_override) {
state = kNoScheme;
continue;
} else {
url->flags |= URL_FLAGS_FAILED;
return;
}
break;
case kScheme:
if (IsASCIIAlphanumeric(ch) || ch == '+' || ch == '-' || ch == '.') {
buffer += ASCIILowercase(ch);
} else if (ch == ':' || (has_state_override && ch == kEOL)) {
if (has_state_override && buffer.size() == 0) {
url->flags |= URL_FLAGS_TERMINATED;
return;
}
buffer += ':';
bool new_is_special = IsSpecial(buffer);
if (has_state_override) {
if ((special != new_is_special) ||
((buffer == "file:") &&
((url->flags & URL_FLAGS_HAS_USERNAME) ||
(url->flags & URL_FLAGS_HAS_PASSWORD) ||
(url->port != -1))) ||
(url->scheme == "file:" && url->host.empty())) {
url->flags |= URL_FLAGS_TERMINATED;
return;
}
}
url->scheme = std::move(buffer);
url->port = NormalizePort(url->scheme, url->port);
if (new_is_special) {
url->flags |= URL_FLAGS_SPECIAL;
special = true;
} else {
url->flags &= ~URL_FLAGS_SPECIAL;
special = false;
}
// `special_back_slash` equals to `(special && ch == '\\')` and `ch`
// here always not equals to `\\`. So `special_back_slash` here always
// equals to `false`.
special_back_slash = false;
buffer.clear();
if (has_state_override)
return;
if (url->scheme == "file:") {
state = kFile;
} else if (special &&
has_base &&
url->scheme == base->scheme) {
state = kSpecialRelativeOrAuthority;
} else if (special) {
state = kSpecialAuthoritySlashes;
} else if (p + 1 < end && p[1] == '/') {
state = kPathOrAuthority;
p++;
} else {
url->flags |= URL_FLAGS_CANNOT_BE_BASE;
url->flags |= URL_FLAGS_HAS_PATH;
url->path.emplace_back("");
state = kCannotBeBase;
}
} else if (!has_state_override) {
buffer.clear();
state = kNoScheme;
p = input;
continue;
} else {
url->flags |= URL_FLAGS_FAILED;
return;
}
break;
case kNoScheme:
cannot_be_base = has_base && (base->flags & URL_FLAGS_CANNOT_BE_BASE);
if (!has_base || (cannot_be_base && ch != '#')) {
url->flags |= URL_FLAGS_FAILED;
return;
} else if (cannot_be_base && ch == '#') {
url->scheme = base->scheme;
if (IsSpecial(url->scheme)) {
url->flags |= URL_FLAGS_SPECIAL;
special = true;
} else {
url->flags &= ~URL_FLAGS_SPECIAL;
special = false;
}
special_back_slash = (special && ch == '\\');
if (base->flags & URL_FLAGS_HAS_PATH) {
url->flags |= URL_FLAGS_HAS_PATH;
url->path = base->path;
}
if (base->flags & URL_FLAGS_HAS_QUERY) {
url->flags |= URL_FLAGS_HAS_QUERY;
url->query = base->query;
}
if (base->flags & URL_FLAGS_HAS_FRAGMENT) {
url->flags |= URL_FLAGS_HAS_FRAGMENT;
url->fragment = base->fragment;
}
url->flags |= URL_FLAGS_CANNOT_BE_BASE;
state = kFragment;
} else if (has_base &&
base->scheme != "file:") {
state = kRelative;
continue;
} else {
url->scheme = "file:";
url->flags |= URL_FLAGS_SPECIAL;
special = true;
state = kFile;
special_back_slash = (special && ch == '\\');
continue;
}
break;
case kSpecialRelativeOrAuthority:
if (ch == '/' && p + 1 < end && p[1] == '/') {