Add Facebook storage and tests for it

Gruntfile.js

@@ -180,7 +180,8 @@ module.exports = function (grunt) {
           'src/jio.storage/localstorage.js',
           'src/jio.storage/indexeddbstorage.js',
           'src/jio.storage/cryptstorage.js',
-          'src/jio.storage/websqlstorage.js'
+          'src/jio.storage/websqlstorage.js',
+          'src/jio.storage/fbstorage.js'
         ],
         dest: 'dist/<%= pkg.name %>-<%= pkg.version %>.js'
 //         dest: 'jio.js'

src/jio.storage/fbstorage.js

+/*jslint nomen: true */
+/*global RSVP, UriTemplate*/
+(function (jIO, RSVP, UriTemplate) {
+  "use strict";
+
+  var GET_POST_URL = "https://graph.facebook.com/v2.9/{+post_id}" +
+      "?fields={+fields}&access_token={+access_token}",
+    get_post_template = UriTemplate.parse(GET_POST_URL),
+    GET_FEED_URL = "https://graph.facebook.com/v2.9/{+user_id}/feed" +
+        "?fields={+fields}&limit={+limit}&since={+since}&access_token=" +
+        "{+access_token}",
+    get_feed_template = UriTemplate.parse(GET_FEED_URL);
+
+  function FBStorage(spec) {
+    if (typeof spec.access_token !== 'string' || !spec.access_token) {
+      throw new TypeError("Access Token must be a string " +
+                          "which contains more than one character.");
+    }
+    if (typeof spec.user_id !== 'string' || !spec.user_id) {
+      throw new TypeError("User ID must be a string " +
+                          "which contains more than one character.");
+    }
+    this._access_token = spec.access_token;
+    this._user_id = spec.user_id;
+    this._default_field_list = spec.default_field_list || [];
+    this._default_limit = spec.default_limit || 500;
+  }
+
+  FBStorage.prototype.get = function (id) {
+    var that = this;
+    return new RSVP.Queue()
+      .push(function () {
+        return jIO.util.ajax({
+          type: "GET",
+          url: get_post_template.expand({post_id: id,
+            fields: that._default_field_list, access_token: that._access_token})
+        });
+      })
+      .push(function (result) {
+        return JSON.parse(result.target.responseText);
+      });
+  };
+
+  function paginateResult(url, result, select_list) {
+    return new RSVP.Queue()
+      .push(function () {
+        return jIO.util.ajax({
+          type: "GET",
+          url: url
+        });
+      })
+      .push(function (response) {
+        return JSON.parse(response.target.responseText);
+      },
+        function (err) {
+          throw new jIO.util.jIOError("Getting feed failed " + err.toString(),
+            err.target.status);
+        })
+      .push(function (response) {
+        if (response.data.length === 0) {
+          return result;
+        }
+        var i, j, obj = {};
+        for (i = 0; i < response.data.length; i += 1) {
+          obj.id = response.data[i].id;
+          obj.value = {};
+          for (j = 0; j < select_list.length; j += 1) {
+            obj.value[select_list[j]] = response.data[i][select_list[j]];
+          }
+          result.push(obj);
+          obj = {};
+        }
+        return paginateResult(response.paging.next, result, select_list);
+      });
+  }
+
+  FBStorage.prototype.buildQuery = function (query) {
+    var that = this, fields = [], limit = this._default_limit,
+      template_argument = {
+        user_id: this._user_id,
+        limit: limit,
+        access_token: this._access_token
+      };
+    if (query.include_docs) {
+      fields = fields.concat(that._default_field_list);
+    }
+    if (query.select_list) {
+      fields = fields.concat(query.select_list);
+    }
+    if (query.limit) {
+      limit = query.limit[1];
+    }
+    template_argument.fields = fields;
+    template_argument.limit = limit;
+    return paginateResult(get_feed_template.expand(template_argument), [],
+      fields)
+      .push(function (result) {
+        if (!query.limit) {
+          return result;
+        }
+        return result.slice(query.limit[0], query.limit[1]);
+      });
+  };
+
+  FBStorage.prototype.hasCapacity = function (name) {
+    var this_storage_capacity_list = ["list", "select", "include", "limit"];
+    if (this_storage_capacity_list.indexOf(name) !== -1) {
+      return true;
+    }
+  };
+
+  jIO.addStorage('facebook', FBStorage);
+
+}(jIO, RSVP, UriTemplate));
\ No newline at end of file

test/tests.html

@@ -53,6 +53,7 @@
   <script src="jio.storage/zipstorage.tests.js"></script>
   <script src="jio.storage/gdrivestorage.tests.js"></script>
   <script src="jio.storage/websqlstorage.tests.js"></script>
+  <script src="jio.storage/fbstorage.tests.js"></script>
   <!--script src="../lib/jquery/jquery.min.js"></script>
   <script src="../src/jio.storage/xwikistorage.js"></script>
   <script src="jio.storage/xwikistorage.tests.js"></script-->