103 lines
3.4 KiB
JavaScript
103 lines
3.4 KiB
JavaScript
var path = require('path');
|
|
var fs = require('fs');
|
|
|
|
var winston = require('winston');
|
|
|
|
var DocumentHandler = require('./document_handler');
|
|
|
|
// For serving static assets
|
|
|
|
var StaticHandler = function(path, cacheAssets) {
|
|
this.basePath = path;
|
|
this.defaultPath = '/index.html';
|
|
this.cacheAssets = cacheAssets;
|
|
// Grab the list of available files - and move into hash for quick lookup
|
|
var available = fs.readdirSync(this.basePath);
|
|
this.availablePaths = {};
|
|
for (var i = 0; i < available.length; i++) {
|
|
this.availablePaths['/' + available[i]] = true;
|
|
}
|
|
};
|
|
|
|
StaticHandler.cache = {};
|
|
|
|
// Determine the content type for a given extension
|
|
StaticHandler.contentTypeFor = function(ext) {
|
|
if (ext == '.js') return 'text/javascript';
|
|
else if (ext == '.css') return 'text/css';
|
|
else if (ext == '.html') return 'text/html';
|
|
else if (ext == '.ico') return 'image/ico';
|
|
else if (ext == '.txt') return 'text/plain';
|
|
else if (ext == '.png') return 'image/png';
|
|
else {
|
|
winston.error('unable to determine content type for static asset with extension: ' + ext);
|
|
return 'text/plain';
|
|
}
|
|
};
|
|
|
|
// Handle a request, and serve back the asset if it exists
|
|
StaticHandler.prototype.handle = function(incPath, response) {
|
|
// If this is a potential key, show the index - otherwise
|
|
// bust out a 404
|
|
if (!this.availablePaths[incPath]) {
|
|
if (incPath === '/' || DocumentHandler.potentialKey(incPath.substring(1))) {
|
|
incPath = this.defaultPath;
|
|
}
|
|
else {
|
|
winston.warn('failed to find static asset', { path: incPath });
|
|
response.writeHead(404, { 'content-type': 'application/json' });
|
|
response.end(JSON.stringify({ message: 'no such file' }));
|
|
return;
|
|
}
|
|
}
|
|
// And then stream the file back - either from the cache or from source
|
|
var filePath = this.basePath + (incPath == '/' ? this.defaultPath : incPath);
|
|
var cached = this.cacheAssets && this.isCached(filePath);
|
|
// Go get'er
|
|
var _this = this;
|
|
var method = cached ? this.serveCached : this.retrieve;
|
|
method(filePath, function(error, content) {
|
|
// detect errors
|
|
if (error) {
|
|
winston.error('unable to read file', { path: filePath, error: error });
|
|
response.writeHead(500, { 'content-type': 'application/json' });
|
|
response.end(JSON.stringify({ message: 'IO: Unable to read file' }));
|
|
// If it was cached, bust the cache
|
|
if (cached) {
|
|
StaticHandler.cache[filePath] = null;
|
|
}
|
|
}
|
|
// Get the content
|
|
else {
|
|
var contentType = StaticHandler.contentTypeFor(path.extname(filePath));
|
|
response.writeHead(200, { 'content-type': contentType });
|
|
response.end(content, 'utf-8');
|
|
// Stick it in the cache if its not in there
|
|
if (!cached && _this.cacheAssets) {
|
|
StaticHandler.cache[filePath] = content;
|
|
}
|
|
}
|
|
});
|
|
};
|
|
|
|
// Retrieve from the file
|
|
StaticHandler.prototype.retrieve = function(filePath, callback) {
|
|
var _this = this;
|
|
winston.verbose('loading static asset', { path: filePath });
|
|
fs.readFile(filePath, function(error, content) {
|
|
callback(error, content);
|
|
});
|
|
};
|
|
|
|
// Retrieve from memory cache
|
|
StaticHandler.prototype.serveCached = function(filePath, callback) {
|
|
callback(undefined, StaticHandler.cache[filePath]);
|
|
};
|
|
|
|
// Determine if a given filePath is cached or not
|
|
StaticHandler.prototype.isCached = function(filePath) {
|
|
return !!StaticHandler.cache[filePath];
|
|
};
|
|
|
|
module.exports = StaticHandler;
|