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use core:io;
use parser;
/**
* A HTTP response.
*/
class Response {
// HTTP version.
Version version = Version:HTTP_1_0;
// HTTP status.
Status status = Status:OK;
// Headers to send. Keys are assumed to be all lowercase.
private Str->Str headers;
// Cookies to send. These are added automatically as headers if present.
Cookie[] cookies;
// Body of the response.
Buffer body;
// Default constructor.
init() {
init {}
}
// Create a 200 response that contains text/html.
init(Str response) {
init {
body = response.toUtf8();
}
contentType = "text/html; charset=utf-8";
}
// Create a response with a particular status and an associated message.
init(Str response, Status status) {
self(response);
status = status;
}
// Create with version and status.
init(Version version, Status status) {
init {
version = version;
status = status;
}
}
// Explicit set for content-type.
assign contentType(Str type) {
headers.put("content-type", type);
}
// Set header.
assign header(Str key, Str val) {
headers.put(key.toAsciiLowercase, val);
}
// Set header.
assign header(Buffer key, Buffer val) {
headers.put(key.toAsciiLowercase, val.fromUtf8);
}
// Get header.
Str? header(Str key) {
return headers.at(key.toAsciiLowercase);
}
// Get header, assume it exists.
Str getHeader(Str key) {
unless (r = header(key))
throw HttpError("Header ${key} does not exist.");
r;
}
// To string.
void toS(StrBuf to) {
to << "response {";
{
Indent z(to);
to << "\nversion: " << version;
to << "\nstatus: " << status;
to << "\nheaders: " << headers;
to << "\ncookies: " << cookies;
to << "\nbody: " << body;
}
to << "\n}";
}
// Serialize the request into a binary object.
// Returns 'true' if the connection should be closed afterwards.
Bool write(OStream to) {
Utf8Output text(to, windowsTextInfo(false));
text.autoFlush = false;
if (version == Version:HTTP_0_9) {
// HTTP 0.9 is special.
to.write(body);
return true;
} else if (version == Version:HTTP_1_0) {
text.write("HTTP/1.0 ");
} else if (version == Version:HTTP_1_1) {
text.write("HTTP/1.1 ");
} else {
throw HttpError("Invalid protocol version!");
}
text.write(status.v.toS);
text.write(" ");
text.write(status.toS);
text.write("\n");
for (k, v in headers) {
if (k == "content-length")
continue;
if (k == "content-encoding")
continue;
text.write(k);
text.write(": ");
text.write(v);
text.write("\n");
}
for (l in cookies) {
if (!l.cookieValid)
continue;
text.write("Set-Cookie: ");
text.write(l.toS);
text.write("\n");
}
text.write("Content-Length: ");
text.write(body.filled.toS);
text.write("\n\n");
text.flush();
to.write(body);
return false;
}
}
parseResponseHeader : parser(recursive descent, binary) {
start = SHttpResponse;
optional delimiter = SOptDelimiter;
required delimiter = SReqDelimiter;
void SOptDelimiter();
SOptDelimiter : " *";
void SReqDelimiter();
SReqDelimiter : " +";
void SNewline();
SNewline : "\r\n";
Response SHttpResponse();
SHttpResponse => Response(version, status)
: SVersion version ~ SStatus status ~ "[^\r\n]+" - SNewline - SHeaders(me);
Version SVersion();
SVersion => Version.HTTP_1_0() : "HTTP/1.0";
SVersion => Version.HTTP_1_1() : "HTTP/1.1";
Status SStatus();
SStatus => toStatus(code) : "[0-9]+" code;
void SHeaders(Response r);
SHeaders : SNewline;
SHeaders => header(r, k, v) : "[^:\r\n]+" k - ":" ~ "[^\r\n]+" v - SNewline - SHeaders(r);
}
private Status toStatus(Buffer buffer) {
Status(buffer.fromUtf8().toNat());
}
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