added new model and controller for licenses

sails/src/api/controllers/LicenseController.js

+/* global Instruction, Method */
+
+/**
+ * LicenseController manages the requests related to the License model.
+ * Read it's documentation for further information.
+ * @type {Object}
+ */
+module.exports = {
+
+  /**
+   * Create a new Instruction, which is associated to the given method
+   * @param  {request} req
+   *   {
+   *     duration (number of months)
+   *   }
+   * @param  {response} res
+   *   {
+   *     code (instructionId)
+   *     method
+   *     name
+   *     objective
+   *   }
+   */
+  create: function (req, res) {
+
+    var params = req.allParams();
+
+    function get_new_random_license (callback) {
+
+      function random_license () {
+        var length = 16;
+        var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        var result = '';
+        for (var i = length; i > 0; --i) result += chars[Math.floor(Math.random() * chars.length)];
+        return result;
+      }
+
+      var license;
+      var found = true;
+      var maxtries = 10;
+      async.doWhilst(
+        function (cb) {
+          license = random_license();
+          License.findOne({number: license})
+          .then((l) => {
+            if (!l)
+              found = false;
+            cb();
+          })
+          .catch((err) => {
+            found = false;
+            cb();
+          });
+        },
+        function () {
+          return found;
+        },
+        function () {
+          callback(license);
+        }
+      );
+    }
+
+    if (!params.duration || params.duration < 0)
+      return res.badRequest();
+
+    get_new_random_license(function (license) {
+      License.create({
+        number: license,
+        duration: params.duration
+      })
+      .then((l) => {
+        if (l) {
+          delete l.id;
+          return res.ok(l);
+        }
+        return res.badRequest();
+      })
+      .catch((err) => {
+        return res.serverError(err);
+      });
+    });
+  },
+
+  /**
+   * Activate an existing License
+   * @param  {request} req (with license number as parameter ID)
+   *   {
+   *     id_stu: id of the student
+   *   }
+   * @param  {response} res
+   */
+  activate: function (req, res) {
+    var params = req.allParams();
+
+    if (!params.number)
+      return res.badRequest();
+
+    License.findOne({ number: params.number })
+    .then((l) => {
+      if (!l)
+        return res.badRequest();
+      if (l.activation_ts)
+        return res.badRequest("The license is already active");
+
+      l.activation_ts = new Date();
+      Student.find(params.id_stu)
+      .then((s) => {
+        if (!s)
+          return res.badRequest("Student not found");
+        l.student = params.id_stu;
+        l.save((err) => {
+          if (err)
+            return res.serverError();
+          return res.ok();
+        });
+      })
+      .catch(() => {
+        return res.serverError();
+      });
+    })
+    .catch(() => {
+      return res.serverError();
+    });
+  }
+};

sails/src/api/models/License.js

+/**
+* License.js
+*
+* @description :: TODO: Write a short summary of how this model works and what it represents here.
+* @docs        :: http://sailsjs.org/#!documentation/models
+*/
+
+module.exports = {
+  tableName     : 'license',
+  migrate       : 'safe',
+  schema        : true,
+  autoPK        : false,
+  autoCreatedAt : false,
+  autoUpdatedAt : false,
+
+  attributes: {
+    id: {
+      type: "integer",
+      autoIncrement: true,
+      primaryKey: true,
+      unique: true
+    },
+    student: { // FK de Student. 1 a N
+      columnName: "id_stu",
+      type: "integer",
+      model: "Student"
+    },
+    creation_ts: {
+      columnName: "creation_ts",
+      type: "datetime"
+    },
+    activation_ts: {
+      columnName: "activation_ts",
+      type: "datetime"
+    },
+    duration: {
+      columnName: "duration",
+      type: "integer"
+    },
+    number: {
+      type: "string",
+      columnName: "number",
+      size: 16,
+      unique: true
+    }
+  }
+}