1 files changed, 71 insertions, 0 deletions
diff --git a/node_modules/express-minify/cache.js b/node_modules/express-minify/cache.js
new file mode 100644
index 0000000..95dff37
--- /dev/null
+++ b/node_modules/express-minify/cache.js
@@ -0,0 +1,71 @@
+var fs = require('fs');
+var path = require('path');
+
+var FileCache = function (basePath) {
+  this.basePath = basePath;
+};
+
+FileCache.prototype.get = function (hash, callback) {
+  var destPath = this.basePath + hash;
+  fs.readFile(destPath, {encoding: 'utf8'}, function (err, data) {
+    if (err) {
+      callback(err);
+      return;
+    }
+    callback(null, data.toString());
+  });
+};
+
+FileCache.prototype.put = function (hash, minized, callback) {
+  var destPath = this.basePath + hash;
+  var tempPath = destPath + '.tmp';
+  // fix issue #3
+  fs.writeFile(tempPath, minized, {encoding: 'utf8'}, function (err) {
+    if (err) {
+      callback(err);
+      return;
+    }
+    fs.rename(tempPath, destPath, callback);
+  });
+};
+
+var MemoryCache = function () {
+  this.cache = {};
+};
+
+MemoryCache.prototype.get = function (hash, callback) {
+  if (!this.cache.hasOwnProperty(hash)) {
+    callback(new Error('miss'));
+  } else {
+    callback(null, this.cache[hash]);
+  }
+};
+
+MemoryCache.prototype.put = function (hash, minized, callback) {
+  this.cache[hash] = minized;
+  callback();
+};
+
+/**
+ * @param {String|false} cacheDirectory  false == use memory cache
+ */
+var Cache = function (cacheDirectory) {
+  this.isFileCache = (cacheDirectory !== false);
+  if (this.isFileCache) {
+    // whether the directory is writeable
+    cacheDirectory = path.normalize(cacheDirectory + '/').toString();
+    try {
+      fs.accessSync(cacheDirectory, fs.W_OK);
+    } catch (ignore) {
+      console.log('WARNING: express-minify cache directory is not writeable, fallback to memory cache.');
+      this.isFileCache = false;
+    }
+  }
+  if (this.isFileCache) {
+    this.layer = new FileCache(cacheDirectory);
+  } else {
+    this.layer = new MemoryCache();
+  }
+};
+
+module.exports = Cache;