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index.js
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index.js
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// Load modules
var Stream = require('stream');
var Boom = require('boom');
var Shot = require('shot');
var Utils = require('../utils');
// Declare internals
var internals = {
maxNestedPreparations: 5
};
/*
/-- Stream -----|--- File
|
Generic --|--- Buffer
|
|--- Directory /-- Text --|-- Redirection
| |
|--- Cacheable --|--- Empty
| |
\-- View |--- Obj ---|-- Error
|
\-- Cached
Closed
*/
// Prototype response types
exports.Generic = internals.Generic = require('./generic');
exports.Cacheable = internals.Cacheable = require('./cacheable');
// Basic response types
exports.Empty = internals.Empty = require('./empty');
exports.Obj = internals.Obj = require('./obj');
exports.Text = internals.Text = require('./text');
exports.Stream = internals.Stream = require('./stream');
exports.File = internals.File = require('./file');
exports.Redirection = internals.Redirection = require('./redirection');
exports.View = internals.View = require('./view');
exports.Buffer = internals.Buffer = require('./buffer');
// Internal response types
internals.Error = require('./error');
internals.Cached = require('./cached');
// Utilities
exports._generate = function (result, onSend) {
var response = null;
if (result === null ||
result === undefined ||
result === '') {
response = new internals.Empty();
}
else if (typeof result === 'string') {
response = new internals.Text(result);
}
else if (typeof result === 'object') {
if (Buffer.isBuffer(result)) {
response = new internals.Buffer(result);
}
else if (result.isHapiResponse ||
(result.isBoom && result instanceof Error)) { // Checking 'instanceof Boom' is unreliable
response = result;
}
else if (result instanceof Error) {
response = new Boom(result);
}
else if (result instanceof Stream) {
response = new internals.Stream(result);
}
}
if (!response) {
response = new internals.Obj(result);
}
if (response.isHapiResponse) {
response._rawResult = result;
}
if (!onSend) {
return response;
}
response.hold = function () {
delete response.hold;
response.send = function () {
delete response.send;
onSend(response);
};
return response;
};
process.nextTick(function () {
delete response.hold;
if (!response.send) {
onSend(response);
}
});
return response;
};
exports._respond = function (item, request, callback) {
var errorPrepared = false;
var prepareCount = 0;
var prepare = function (response) {
if (!response ||
(!response.variety && !response.isBoom)) {
response = Boom.internal('Unexpected response item', response);
}
if (response.isBoom) {
response = new internals.Error(response);
}
if (!response._prepare) {
return etag(response);
}
response._prepare(request, function (result) {
if (!result._wasPrepared) {
++prepareCount;
if (prepareCount > internals.maxNestedPreparations) { // Prevent prepare loops
result = new internals.Error(Boom.internal('Response prepare count exceeded maximum allowed', item));
return send(result);
}
if (result.isBoom) {
if (errorPrepared) {
return send(new internals.Error(result));
}
errorPrepared = true; // Prevent error loops
}
return prepare(result);
}
return etag(result);
});
};
var etag = function (response) {
if (request.method !== 'get' &&
request.method !== 'head') {
return send(response);
}
// Process ETag
var etag = response._headers && response._headers.etag;
if (etag &&
request.raw.req.headers['if-none-match'] === etag) {
var unchanged = new internals.Empty();
unchanged.code(304);
return prepare(unchanged);
}
// Process If-Modified-Since headers
var ifModifiedSinceHeader = request.raw.req.headers['if-modified-since'];
var lastModifiedHeader = response._headers && response._headers['Last-Modified'];
if (ifModifiedSinceHeader &&
lastModifiedHeader) {
var ifModifiedSince = Date.parse(ifModifiedSinceHeader);
var lastModified = Date.parse(lastModifiedHeader);
if (ifModifiedSince &&
lastModified &&
ifModifiedSince >= lastModified) {
var unchanged = new internals.Empty();
unchanged.code(304);
return prepare(unchanged);
}
}
return send(response);
};
var send = function (response) {
// Injection
if (response._payload &&
response._payload.length) {
if (Shot.isInjection(request.raw.req) &&
response.hasOwnProperty('raw')) {
request.raw.res.hapi = { result: response.raw };
}
}
response._transmit(request, function () {
request._response = response; // Error occurs late and should update request.response object
request.log(['hapi', 'response', response.variety]);
return callback(request);
});
};
prepare(item);
};