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