Beautiful urls (#18)

* Added uri property to Page model

* Added aliases collection

* Added routing form aliases

* Fixed redirect after page creation

* Added abiltity to support few pages with same title

* Added ability to change uri manually

* Changed hash function

* Changed uri parsing

* Removed pages controller promise

* Modified page's tests

* Added tests for alias model

* Added tests for aliases

* Escaping special characters

* Added missed files

* Fixed bugs related to translation

* Fixed parent page link

* Added server validation for uri

* Changed css properties order

* Made uri property of page be optional

* Prevented alias creation from empty uri

* Moved alias types to model

src/models/alias.js

@@ -0,0 +1,129 @@
+const {aliases: aliasesDb} = require('../utils/database/index');
+const binaryMD5 = require('../utils/crypto');
+
+/**
+ * @typedef {Object} AliasData
+ * @property {string} _id - alias id
+ * @property {string} hash - alias binary hash
+ * @property {string} type - entity type
+ * @property {boolean} deprecated - indicate if alias deprecated
+ * @property {string} id - entity id
+ *
+ */
+
+/**
+ * @class Alias
+ * @property {string} _id - alias id
+ * @property {string} hash - alias binary hash
+ * @property {string} type - entity type
+ * @property {boolean} deprecated - indicate if alias deprecated
+ * @property {string} id - entity title
+ */
+class Alias {
+  /**
+   * Return Alias types
+   *
+   * @returns {Object}
+   */
+  static get types() {
+    return {
+      PAGE: 'page'
+    };
+  };
+
+  /**
+   * Find and return alias with given alias
+   * @param {string} aliasName - alias of entity
+   * @returns {Promise<Alias>}
+   */
+  static async get(aliasName) {
+    const hash = binaryMD5(aliasName);
+    let data = await aliasesDb.findOne({hash: hash, deprecated: false});
+
+    if (!data) {
+      data = await aliasesDb.findOne({hash: hash});
+    }
+
+    return new Alias(data);
+  }
+
+  /**
+   * @constructor
+   *
+   * @param {AliasData} data
+   * @param {string} aliasName - alias of entity
+   */
+  constructor(data = {}, aliasName = '') {
+    if (data === null) {
+      data = {};
+    }
+    if (data._id) {
+      this._id = data._id;
+    }
+    if (aliasName) {
+      this.hash = binaryMD5(aliasName);
+    }
+    this.data = data;
+  }
+
+  /**
+   * Save or update alias data in the database
+   *
+   * @returns {Promise<Alias>}
+   */
+  async save() {
+    if (!this._id) {
+      const insertedRow = await aliasesDb.insert(this.data);
+
+      this._id = insertedRow._id;
+    } else {
+      await aliasesDb.update({_id: this._id}, this.data);
+    }
+
+    return this;
+  }
+
+  /**
+   * Set AliasData object fields to internal model fields
+   *
+   * @param {AliasData} aliasData
+   */
+  set data(aliasData) {
+    const {id, type, hash, deprecated} = aliasData;
+
+    this.id = id || this.id;
+    this.type = type || this.type;
+    this.hash = hash || this.hash;
+    this.deprecated = deprecated || false;
+  }
+
+  /**
+   * Return AliasData object
+   *
+   * @returns {AliasData}
+   */
+  get data() {
+    return {
+      _id: this._id,
+      id: this.id,
+      type: this.type,
+      hash: this.hash,
+      deprecated: this.deprecated
+    };
+  }
+
+  /**
+   * Mark alias as deprecated
+   * @param {string} aliasName - alias of entity
+   * @returns {Promise<Alias>}
+   */
+  static async markAsDeprecated(aliasName) {
+    const alias = await Alias.get(aliasName);
+
+    alias.deprecated = true;
+
+    return alias.save();
+  }
+}
+
+module.exports = Alias;