draft: refactor project so it sits on top of a standalone app

zero.Web.UI/node_modules/http-proxy-middleware/lib/path-rewriter.js

@@ -0,0 +1,79 @@
+var _ = require('lodash')
+var logger = require('./logger').getInstance()
+var ERRORS = require('./errors')
+
+module.exports = {
+  create: createPathRewriter
+}
+
+/**
+ * Create rewrite function, to cache parsed rewrite rules.
+ *
+ * @param {Object} rewriteConfig
+ * @return {Function} Function to rewrite paths; This function should accept `path` (request.url) as parameter
+ */
+function createPathRewriter(rewriteConfig) {
+  var rulesCache
+
+  if (!isValidRewriteConfig(rewriteConfig)) {
+    return
+  }
+
+  if (_.isFunction(rewriteConfig)) {
+    var customRewriteFn = rewriteConfig
+    return customRewriteFn
+  } else {
+    rulesCache = parsePathRewriteRules(rewriteConfig)
+    return rewritePath
+  }
+
+  function rewritePath(path) {
+    var result = path
+
+    _.forEach(rulesCache, function(rule) {
+      if (rule.regex.test(path)) {
+        result = result.replace(rule.regex, rule.value)
+        logger.debug('[HPM] Rewriting path from "%s" to "%s"', path, result)
+        return false
+      }
+    })
+
+    return result
+  }
+}
+
+function isValidRewriteConfig(rewriteConfig) {
+  if (_.isFunction(rewriteConfig)) {
+    return true
+  } else if (!_.isEmpty(rewriteConfig) && _.isPlainObject(rewriteConfig)) {
+    return true
+  } else if (
+    _.isUndefined(rewriteConfig) ||
+    _.isNull(rewriteConfig) ||
+    _.isEqual(rewriteConfig, {})
+  ) {
+    return false
+  } else {
+    throw new Error(ERRORS.ERR_PATH_REWRITER_CONFIG)
+  }
+}
+
+function parsePathRewriteRules(rewriteConfig) {
+  var rules = []
+
+  if (_.isPlainObject(rewriteConfig)) {
+    _.forIn(rewriteConfig, function(value, key) {
+      rules.push({
+        regex: new RegExp(key),
+        value: rewriteConfig[key]
+      })
+      logger.info(
+        '[HPM] Proxy rewrite rule created: "%s" ~> "%s"',
+        key,
+        rewriteConfig[key]
+      )
+    })
+  }
+
+  return rules
+}