/**
* Tries to construct an HTTP request object from the given string.
* @return Returns the object representing the request on success, or NULL if
* the string could not be parsed. If set, consumed will be filled with
* the amount of data that was consumed from the string to parse the request.
*/
Request* Request::fromString(const string &str, unsigned int *consumed)
{
unsigned int cons = 0;
//Parse the first line which consists of the request type.
size_t firstCRLF = str.find("\r\n");
if (firstCRLF == string::npos) return NULL;
string firstLine = str.substr(0, firstCRLF);
cons = firstCRLF + 2;
size_t methodPos = firstLine.find(" ");
if (methodPos == string::npos) return NULL;
string method = firstLine.substr(0, methodPos);
Type type;
if (method == "GET") type = kGET;
else if (method == "POST") type = kPOST;
else if (method == "DELETE") type = kDELETE;
else if (method == "PUT") type = kPUT;
else {
throw new GenericError(string("Received HTTP request with unknown method '") + method + "'.");
}
size_t pathPos = firstLine.find(" ", methodPos + 1);
if (pathPos == string::npos) return NULL;
string path = firstLine.substr(methodPos + 1, pathPos - methodPos - 1);
//Parse the header.
unsigned int hsConsumed = 0;
HeaderSet *hs = HeaderSet::fromString(str.substr(firstCRLF + 2), &hsConsumed);
cons += hsConsumed;
if (!hs) return NULL;
//Read the content.
int expectedLength = 0;
if (hs->has("Content-Length")) {
expectedLength = atoi(hs->get("Content-Length").c_str());
if (expectedLength > str.size() - cons) {
return NULL;
}
}
//Create the request object.
Request *req = new Request;
req->type = type;
req->path = path;
req->headers = *hs;
req->content = str.substr(cons, expectedLength);
cons += expectedLength;
if (consumed) *consumed = cons;
return req;
}
