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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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