node/src/node_http_parser.cc at master · BevanR/node · GitHub

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#include <node_http_parser.h>

#include <v8.h>

#include <node.h>

#include <node_buffer.h>

#include <http_parser.h>

#include <strings.h> /* strcasecmp() */

#include <string.h> /* strdup() */

#include <stdlib.h> /* free() */

// This is a binding to http_parser (http://github.com/ry/http-parser)

// The goal is to decouple sockets from parsing for more javascript-level

// agility. A Buffer is read from a socket and passed to parser.execute().

// The parser then issues callbacks with slices of the data

// parser.onMessageBegin

// parser.onPath

// parser.onBody

// ...

// No copying is performed when slicing the buffer, only small reference

// allocations.

namespace node {

using namespace v8;

static Persistent<String> on_message_begin_sym;

static Persistent<String> on_path_sym;

static Persistent<String> on_query_string_sym;

static Persistent<String> on_url_sym;

static Persistent<String> on_fragment_sym;

static Persistent<String> on_header_field_sym;

static Persistent<String> on_header_value_sym;

static Persistent<String> on_headers_complete_sym;

static Persistent<String> on_body_sym;

static Persistent<String> on_message_complete_sym;

static Persistent<String> delete_sym;

static Persistent<String> get_sym;

static Persistent<String> head_sym;

static Persistent<String> post_sym;

static Persistent<String> put_sym;

static Persistent<String> connect_sym;

static Persistent<String> options_sym;

static Persistent<String> trace_sym;

static Persistent<String> copy_sym;

static Persistent<String> lock_sym;

static Persistent<String> mkcol_sym;

static Persistent<String> move_sym;

static Persistent<String> propfind_sym;

static Persistent<String> proppatch_sym;

static Persistent<String> unlock_sym;

static Persistent<String> report_sym;

static Persistent<String> mkactivity_sym;

static Persistent<String> checkout_sym;

static Persistent<String> merge_sym;

static Persistent<String> unknown_method_sym;

static Persistent<String> method_sym;

static Persistent<String> status_code_sym;

static Persistent<String> http_version_sym;

static Persistent<String> version_major_sym;

static Persistent<String> version_minor_sym;

static Persistent<String> should_keep_alive_sym;

static Persistent<String> upgrade_sym;

static struct http_parser_settings settings;

// Callback prototype for http_cb

#define DEFINE_HTTP_CB(name) \

static int name(http_parser *p) { \

Parser *parser = static_cast<Parser*>(p->data); \

Local<Value> cb_value = parser->handle_->Get(name##_sym); \

if (!cb_value->IsFunction()) return 0; \

Local<Function> cb = Local<Function>::Cast(cb_value); \

Local<Value> ret = cb->Call(parser->handle_, 0, NULL); \

if (ret.IsEmpty()) { \

parser->got_exception_ = true; \

return -1; \

} else { \

return 0; \

} \

}

// Callback prototype for http_data_cb

#define DEFINE_HTTP_DATA_CB(name) \

static int name(http_parser *p, const char *at, size_t length) { \

Parser *parser = static_cast<Parser*>(p->data); \

assert(parser->buffer_); \

Local<Value> cb_value = parser->handle_->Get(name##_sym); \

if (!cb_value->IsFunction()) return 0; \

Local<Function> cb = Local<Function>::Cast(cb_value); \

Local<Value> argv[3] = { Local<Value>::New(parser->buffer_->handle_) \

, Integer::New(at - parser->buffer_->data()) \

, Integer::New(length) \

}; \

Local<Value> ret = cb->Call(parser->handle_, 3, argv); \

assert(parser->buffer_); \

if (ret.IsEmpty()) { \

parser->got_exception_ = true; \

return -1; \

} else { \

return 0; \

} \

}

static inline Persistent<String>

method_to_str(unsigned short m) {

switch (m) {

case HTTP_DELETE: return delete_sym;

case HTTP_GET: return get_sym;

case HTTP_HEAD: return head_sym;

case HTTP_POST: return post_sym;

case HTTP_PUT: return put_sym;

case HTTP_CONNECT: return connect_sym;

case HTTP_OPTIONS: return options_sym;

case HTTP_TRACE: return trace_sym;

case HTTP_COPY: return copy_sym;

case HTTP_LOCK: return lock_sym;

case HTTP_MKCOL: return mkcol_sym;

case HTTP_MOVE: return move_sym;

case HTTP_PROPFIND: return propfind_sym;

case HTTP_PROPPATCH: return proppatch_sym;

case HTTP_UNLOCK: return unlock_sym;

case HTTP_REPORT: return report_sym;

case HTTP_MKACTIVITY: return mkactivity_sym;

case HTTP_CHECKOUT: return checkout_sym;

case HTTP_MERGE: return merge_sym;

default: return unknown_method_sym;

}

class Parser : public ObjectWrap {

public:

Parser(enum http_parser_type type) : ObjectWrap() {

buffer_ = NULL;

Init(type);

}

~Parser() {

assert(buffer_ == NULL && "Destroying a parser while it's parsing");

}

DEFINE_HTTP_CB(on_message_begin)

DEFINE_HTTP_CB(on_message_complete)

DEFINE_HTTP_DATA_CB(on_path)

DEFINE_HTTP_DATA_CB(on_url)

DEFINE_HTTP_DATA_CB(on_fragment)

DEFINE_HTTP_DATA_CB(on_query_string)

DEFINE_HTTP_DATA_CB(on_header_field)

DEFINE_HTTP_DATA_CB(on_header_value)

DEFINE_HTTP_DATA_CB(on_body)

static int on_headers_complete(http_parser *p) {

Parser *parser = static_cast<Parser*>(p->data);

Local<Value> cb_value = parser->handle_->Get(on_headers_complete_sym);

if (!cb_value->IsFunction()) return 0;

Local<Function> cb = Local<Function>::Cast(cb_value);

Local<Object> message_info = Object::New();

// METHOD

if (p->type == HTTP_REQUEST) {

message_info->Set(method_sym, method_to_str(p->method));

}

// STATUS

if (p->type == HTTP_RESPONSE) {

message_info->Set(status_code_sym, Integer::New(p->status_code));

}

// VERSION

message_info->Set(version_major_sym, Integer::New(p->http_major));

message_info->Set(version_minor_sym, Integer::New(p->http_minor));

message_info->Set(should_keep_alive_sym,

http_should_keep_alive(p) ? True() : False());

message_info->Set(upgrade_sym, p->upgrade ? True() : False());

Local<Value> argv[1] = { message_info };

Local<Value> head_response = cb->Call(parser->handle_, 1, argv);

if (head_response.IsEmpty()) {

parser->got_exception_ = true;

return -1;

} else {

return head_response->IsTrue() ? 1 : 0;

}

static Handle<Value> New(const Arguments& args) {

HandleScope scope;

String::Utf8Value type(args[0]->ToString());

Parser *parser;

if (0 == strcasecmp(*type, "request")) {

parser = new Parser(HTTP_REQUEST);

} else if (0 == strcasecmp(*type, "response")) {

parser = new Parser(HTTP_RESPONSE);

} else {

return ThrowException(Exception::Error(

String::New("Constructor argument be 'request' or 'response'")));

}

parser->Wrap(args.This());

assert(!parser->buffer_);

return args.This();

}

// var bytesParsed = parser->execute(buffer, off, len);

static Handle<Value> Execute(const Arguments& args) {

HandleScope scope;

Parser *parser = ObjectWrap::Unwrap<Parser>(args.This());

assert(!parser->buffer_);

if (parser->buffer_) {

return ThrowException(Exception::TypeError(

String::New("Already parsing a buffer")));

}

if (!Buffer::HasInstance(args[0])) {

return ThrowException(Exception::TypeError(

String::New("Argument should be a buffer")));

}

Buffer * buffer = ObjectWrap::Unwrap<Buffer>(args[0]->ToObject());

size_t off = args[1]->Int32Value();

if (off >= buffer->length()) {

return ThrowException(Exception::Error(

String::New("Offset is out of bounds")));

}

size_t len = args[2]->Int32Value();

if (off+len > buffer->length()) {

return ThrowException(Exception::Error(

String::New("Length is extends beyond buffer")));

}

// Assign 'buffer_' while we parse. The callbacks will access that varible.

parser->buffer_ = buffer;

parser->got_exception_ = false;

size_t nparsed =

http_parser_execute(&parser->parser_, &settings, buffer->data()+off, len);

// Unassign the 'buffer_' variable

assert(parser->buffer_);

parser->buffer_ = NULL;

// If there was an exception in one of the callbacks

if (parser->got_exception_) return Local<Value>();

Local<Integer> nparsed_obj = Integer::New(nparsed);

// If there was a parse error in one of the callbacks

// TODO What if there is an error on EOF?

if (!parser->parser_.upgrade && nparsed != len) {

Local<Value> e = Exception::Error(String::NewSymbol("Parse Error"));

Local<Object> obj = e->ToObject();

obj->Set(String::NewSymbol("bytesParsed"), nparsed_obj);

return scope.Close(e);

} else {

return scope.Close(nparsed_obj);

}

static Handle<Value> Finish(const Arguments& args) {

HandleScope scope;

Parser *parser = ObjectWrap::Unwrap<Parser>(args.This());

assert(!parser->buffer_);

parser->got_exception_ = false;

http_parser_execute(&(parser->parser_), &settings, NULL, 0);

if (parser->got_exception_) return Local<Value>();

return Undefined();

}

static Handle<Value> Reinitialize(const Arguments& args) {

HandleScope scope;

Parser *parser = ObjectWrap::Unwrap<Parser>(args.This());

String::Utf8Value type(args[0]->ToString());

if (0 == strcasecmp(*type, "request")) {

parser->Init(HTTP_REQUEST);

} else if (0 == strcasecmp(*type, "response")) {

parser->Init(HTTP_RESPONSE);

} else {

return ThrowException(Exception::Error(

String::New("Argument be 'request' or 'response'")));

}

return Undefined();

}

private:

void Init (enum http_parser_type type) {

assert(buffer_ == NULL); // don't call this during Execute()

http_parser_init(&parser_, type);

parser_.data = this;

}

Buffer * buffer_; // The buffer currently being parsed.

bool got_exception_;

http_parser parser_;

};

static Handle<Value> UrlDecode (const Arguments& args) {

HandleScope scope;

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(

String::New("First arg must be a string")));

}

bool decode_spaces = args[1]->IsTrue();

String::Utf8Value in_v(args[0]->ToString());

size_t l = in_v.length();

char* out = strdup(*in_v);

enum { CHAR, HEX0, HEX1 } state = CHAR;

int n, m, hexchar;

size_t in_index = 0, out_index = 0;

char c;

for (; in_index <= l; in_index++) {

c = out[in_index];

switch (state) {

case CHAR:

switch (c) {

case '%':

n = 0;

m = 0;

state = HEX0;

break;

case '+':

if (decode_spaces) c = ' ';

// pass thru

default:

out[out_index++] = c;

break;

}

break;

case HEX0:

state = HEX1;

hexchar = c;

if ('0' <= c && c <= '9') {

n = c - '0';

} else if ('a' <= c && c <= 'f') {

n = c - 'a' + 10;

} else if ('A' <= c && c <= 'F') {

n = c - 'A' + 10;

} else {

out[out_index++] = '%';

out[out_index++] = c;

state = CHAR;

break;

}

break;

case HEX1:

state = CHAR;

if ('0' <= c && c <= '9') {

m = c - '0';

} else if ('a' <= c && c <= 'f') {

m = c - 'a' + 10;

} else if ('A' <= c && c <= 'F') {

m = c - 'A' + 10;

} else {

out[out_index++] = '%';

out[out_index++] = hexchar;

out[out_index++] = c;

break;

}

out[out_index++] = 16*n + m;

break;

}

Local<String> out_v = String::New(out, out_index-1);

free(out);

return scope.Close(out_v);

}

void InitHttpParser(Handle<Object> target) {

HandleScope scope;

Local<FunctionTemplate> t = FunctionTemplate::New(Parser::New);

t->InstanceTemplate()->SetInternalFieldCount(1);

t->SetClassName(String::NewSymbol("HTTPParser"));

NODE_SET_PROTOTYPE_METHOD(t, "execute", Parser::Execute);

NODE_SET_PROTOTYPE_METHOD(t, "finish", Parser::Finish);

NODE_SET_PROTOTYPE_METHOD(t, "reinitialize", Parser::Reinitialize);

target->Set(String::NewSymbol("HTTPParser"), t->GetFunction());

NODE_SET_METHOD(target, "urlDecode", UrlDecode);

on_message_begin_sym = NODE_PSYMBOL("onMessageBegin");

on_path_sym = NODE_PSYMBOL("onPath");

on_query_string_sym = NODE_PSYMBOL("onQueryString");

on_url_sym = NODE_PSYMBOL("onURL");

on_fragment_sym = NODE_PSYMBOL("onFragment");

on_header_field_sym = NODE_PSYMBOL("onHeaderField");

on_header_value_sym = NODE_PSYMBOL("onHeaderValue");

on_headers_complete_sym = NODE_PSYMBOL("onHeadersComplete");

on_body_sym = NODE_PSYMBOL("onBody");

on_message_complete_sym = NODE_PSYMBOL("onMessageComplete");

delete_sym = NODE_PSYMBOL("DELETE");

get_sym = NODE_PSYMBOL("GET");

head_sym = NODE_PSYMBOL("HEAD");

post_sym = NODE_PSYMBOL("POST");

put_sym = NODE_PSYMBOL("PUT");

connect_sym = NODE_PSYMBOL("CONNECT");

options_sym = NODE_PSYMBOL("OPTIONS");

trace_sym = NODE_PSYMBOL("TRACE");

copy_sym = NODE_PSYMBOL("COPY");

lock_sym = NODE_PSYMBOL("LOCK");

mkcol_sym = NODE_PSYMBOL("MKCOL");

move_sym = NODE_PSYMBOL("MOVE");

propfind_sym = NODE_PSYMBOL("PROPFIND");

proppatch_sym = NODE_PSYMBOL("PROPPATCH");

unlock_sym = NODE_PSYMBOL("UNLOCK");

report_sym = NODE_PSYMBOL("REPORT");

mkactivity_sym = NODE_PSYMBOL("MKACTIVITY");

checkout_sym = NODE_PSYMBOL("CHECKOUT");

merge_sym = NODE_PSYMBOL("MERGE");

unknown_method_sym = NODE_PSYMBOL("UNKNOWN_METHOD");

method_sym = NODE_PSYMBOL("method");

status_code_sym = NODE_PSYMBOL("statusCode");

http_version_sym = NODE_PSYMBOL("httpVersion");

version_major_sym = NODE_PSYMBOL("versionMajor");

version_minor_sym = NODE_PSYMBOL("versionMinor");

should_keep_alive_sym = NODE_PSYMBOL("shouldKeepAlive");

upgrade_sym = NODE_PSYMBOL("upgrade");

settings.on_message_begin = Parser::on_message_begin;

settings.on_path = Parser::on_path;

settings.on_query_string = Parser::on_query_string;

settings.on_url = Parser::on_url;

settings.on_fragment = Parser::on_fragment;

settings.on_header_field = Parser::on_header_field;

settings.on_header_value = Parser::on_header_value;

settings.on_headers_complete = Parser::on_headers_complete;

settings.on_body = Parser::on_body;

settings.on_message_complete = Parser::on_message_complete;

}

} // namespace node

node/src/node_http_parser.cc at master · BevanR/node · GitHub

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