feat: use http interceptor for backendless development

Note: intercept method of the FakeBackendInterceptor should
be developed further whenever it is needed to fake a response
from the backend.

Closes #37

package-lock.json

@@ -3061,6 +3061,7 @@
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
       "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
       "dev": true,
+      "optional": true,
       "requires": {
         "delegates": "^1.0.0",
         "readable-stream": "^2.0.6"
@@ -4570,7 +4571,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
       "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "constants-browserify": {
       "version": "1.0.0",
@@ -5196,7 +5198,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
       "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "depd": {
       "version": "1.1.2",
@@ -6948,6 +6951,7 @@
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
       "integrity": "sha1-XB+x8RdHcRTwYyoOtLcbPLD9MXE=",
       "dev": true,
+      "optional": true,
       "requires": {
         "graceful-fs": "^4.1.2",
         "inherits": "~2.0.0",
@@ -6976,6 +6980,7 @@
       "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
       "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
       "dev": true,
+      "optional": true,
       "requires": {
         "aproba": "^1.0.3",
         "console-control-strings": "^1.0.0",
@@ -6991,13 +6996,15 @@
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -7007,6 +7014,7 @@
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -7018,6 +7026,7 @@
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -7050,7 +7059,8 @@
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-4.0.1.tgz",
       "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "get-stream": {
       "version": "3.0.0",
@@ -7249,7 +7259,8 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
       "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "has-value": {
       "version": "1.0.0",
@@ -8095,7 +8106,8 @@
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/is-utf8/-/is-utf8-0.2.1.tgz",
       "integrity": "sha1-Sw2hRCEE0bM2NA6AeX6GXPOffXI=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-windows": {
       "version": "1.0.2",
@@ -8836,6 +8848,7 @@
       "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
       "integrity": "sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=",
       "dev": true,
+      "optional": true,
       "requires": {
         "graceful-fs": "^4.1.2",
         "parse-json": "^2.2.0",
@@ -8848,7 +8861,8 @@
           "version": "2.3.0",
           "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
           "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -9166,7 +9180,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/map-obj/-/map-obj-1.0.1.tgz",
       "integrity": "sha1-2TPOuSBdgr3PSIb2dCvcK03qFG0=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "map-stream": {
       "version": "0.1.0",
@@ -9894,6 +9909,7 @@
       "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-4.1.2.tgz",
       "integrity": "sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "are-we-there-yet": "~1.1.2",
         "console-control-strings": "~1.1.0",
@@ -11201,7 +11217,8 @@
           "version": "2.3.0",
           "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
           "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -11210,6 +11227,7 @@
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
       "integrity": "sha1-9f+qXs0pyzHAR0vKfXVra7KePyg=",
       "dev": true,
+      "optional": true,
       "requires": {
         "load-json-file": "^1.0.0",
         "normalize-package-data": "^2.3.2",
@@ -11221,6 +11239,7 @@
           "resolved": "https://registry.npmjs.org/path-type/-/path-type-1.1.0.tgz",
           "integrity": "sha1-WcRPfuSR2nBNpBXaWkBwuk+P5EE=",
           "dev": true,
+          "optional": true,
           "requires": {
             "graceful-fs": "^4.1.2",
             "pify": "^2.0.0",
@@ -11240,6 +11259,7 @@
       "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-1.0.1.tgz",
       "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
       "dev": true,
+      "optional": true,
       "requires": {
         "find-up": "^1.0.0",
         "read-pkg": "^1.0.0"
@@ -11250,6 +11270,7 @@
           "resolved": "https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz",
           "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
           "dev": true,
+          "optional": true,
           "requires": {
             "path-exists": "^2.0.0",
             "pinkie-promise": "^2.0.0"
@@ -11260,6 +11281,7 @@
           "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-2.1.0.tgz",
           "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
           "dev": true,
+          "optional": true,
           "requires": {
             "pinkie-promise": "^2.0.0"
           }
@@ -12697,6 +12719,7 @@
       "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
       "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-utf8": "^0.2.0"
       }
@@ -14396,6 +14419,7 @@
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "string-width": "^1.0.2 || 2"
       }

src/app/_helpers/data/sampleConfiguration.ts

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {SCBackendAggregationConfiguration, SCThingType} from '@openstapps/core';
+
+// provides sample aggregations to be used in tests or backendless development
+export const sampleAggregations: SCBackendAggregationConfiguration[] = [
+  {
+    fieldName: 'categories',
+    onlyOnTypes: [
+      SCThingType.AcademicEvent,
+      SCThingType.Article,
+      SCThingType.Building,
+      SCThingType.Catalog,
+      SCThingType.Dish,
+      SCThingType.PointOfInterest,
+      SCThingType.Room,
+    ],
+  },
+  {
+    fieldName: 'inPlace.name',
+    onlyOnTypes: [
+      SCThingType.DateSeries,
+      SCThingType.Dish,
+      SCThingType.Floor,
+      SCThingType.Organization,
+      SCThingType.PointOfInterest,
+      SCThingType.Room,
+      SCThingType.Ticket,
+    ],
+  },
+  {
+    fieldName: 'academicTerms.acronym',
+    onlyOnTypes: [
+      SCThingType.AcademicEvent,
+      SCThingType.SportCourse,
+    ],
+  },
+  {
+    fieldName: 'academicTerm.acronym',
+    onlyOnTypes: [
+      SCThingType.Catalog,
+    ],
+  },
+  {
+    fieldName: 'majors',
+    onlyOnTypes: [
+      SCThingType.AcademicEvent,
+    ],
+  },
+  {
+    fieldName: 'keywords',
+    onlyOnTypes: [
+      SCThingType.Article,
+      SCThingType.Book,
+      SCThingType.Message,
+      SCThingType.Video,
+    ],
+  },
+  {
+    fieldName: 'type',
+  },
+];

src/app/_helpers/data/sampleThings.ts

@@ -0,0 +1,370 @@
+/*
+ * Copyright (C) 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {SCAcademicEvent, SCArticle, SCBook, SCBuilding, SCCatalog,
+  SCDateSeries, SCDish, SCFavorite, SCMessage, SCPerson, SCRoom,
+  SCThing, SCThingOriginType, SCThingType, SCToDo, SCToDoPriority} from '@openstapps/core';
+
+const sampleMessages: SCMessage[] = [
+  {
+    audiences: ['students'],
+    message: 'Foo Message Text',
+    name: 'Foo Message',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Message,
+    uid: 'message-123',
+  },
+  {
+    audiences: ['employees'],
+    message: 'Bar Message Text',
+    name: 'Bar Message',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Message,
+    uid: 'message-456',
+  },
+];
+
+const sampleDishes: SCDish[] = [
+  {
+    categories: ['main dish'],
+    name: 'Foo Dish',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Dish,
+    uid: 'dish-123',
+  },
+  {
+    categories: ['side dish'],
+    name: 'Bar Dish',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Dish,
+    uid: 'dish-456',
+  },
+];
+
+const sampleBuildings: SCBuilding[] = [
+  {
+    categories: ['education'],
+    geo: {
+      point: {type: 'Point', coordinates: [12, 12]},
+    },
+    name: 'Foo Building',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Building,
+    uid: 'building-123',
+  },
+];
+
+const sampleRooms: SCRoom[] = [
+  {
+    categories: ['library'],
+    geo: {
+      point: {type: 'Point', coordinates: [12, 12]},
+    },
+    name: 'Foo Room',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Room,
+    uid: 'room-123',
+  },
+];
+
+const sampleArticles: SCArticle[] = [
+  {
+    articleBody: 'Foo Text',
+    categories: ['unipedia'],
+    name: 'Foo Article',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Article,
+    uid: 'article-123',
+  },
+  {
+    articleBody: 'Bar Text',
+    categories: ['unipedia'],
+    name: 'Bar Article',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Article,
+    uid: 'article-456',
+  },
+];
+
+const samplePersons: SCPerson[] = [
+  {
+    familyName: 'Person',
+    givenName: 'Foo',
+    name: 'Foo Person',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Person,
+    uid: 'person-123',
+  },
+  {
+    familyName: 'Person',
+    givenName: 'Bar',
+    name: 'Bar Person',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Person,
+    uid: 'person-456',
+  },
+];
+
+const sampleBooks: SCBook[] = [
+  {
+    authors: samplePersons,
+    isbn: '123456',
+    name: 'Foo Book',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Book,
+    uid: 'book-123',
+  },
+  {
+    authors: [],
+    isbn: '123456',
+    name: 'Bar Book',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Book,
+    uid: 'book-234',
+  },
+];
+
+const sampleCatalogs: SCCatalog[] = [
+  {
+    categories: ['university events'],
+    level: 1,
+    name: 'Foo Catalog',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Catalog,
+    uid: 'catalog-123',
+  },
+  {
+    categories: ['university events'],
+    level: 1,
+    name: 'Bar Catalog',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.Catalog,
+    uid: 'catalog-456',
+  },
+];
+
+const sampleTodos: SCToDo[] = [
+  {
+    categories: ['foo category'],
+    done: false,
+    name: 'Foo Todo',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    priority: SCToDoPriority.LOW,
+    type: SCThingType.ToDo,
+    uid: 'todo-123',
+  },
+  {
+    categories: ['bar category'],
+    done: true,
+    name: 'Bar Todo',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    priority: SCToDoPriority.HIGH,
+    type: SCThingType.ToDo,
+    uid: 'todo-456',
+  },
+];
+
+const sampleFavorites: SCFavorite[] = [
+  {
+    data: sampleBuildings[0],
+    name: 'Foo Favorite',
+    origin: {
+      created: 'SOME-DATE',
+      type: SCThingOriginType.User,
+    },
+    type: SCThingType.Favorite,
+    uid: 'favorite-123',
+  },
+  {
+    data: samplePersons[1],
+    name: 'Bar Favorite',
+    origin: {
+      created: 'SOME-DATE',
+      type: SCThingOriginType.User,
+    },
+    type: SCThingType.Favorite,
+    uid: 'favorite-456',
+  },
+];
+
+const sampleAcademicEvents: SCAcademicEvent[] = [
+  {
+    categories: ['course'],
+    majors: ['Major One', 'Major Two'],
+    name: 'Foo Academic Event',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    performers: samplePersons,
+    type: SCThingType.AcademicEvent,
+    uid: 'academic-event-123',
+  },
+  {
+    categories: ['practicum'],
+    majors: ['Major Two', 'Major Three'],
+    name: 'Bar Academic Event',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    performers: samplePersons,
+    type: SCThingType.AcademicEvent,
+    uid: 'academic-event-456',
+  },
+];
+
+const sampleDateSeries: SCDateSeries[] = [
+  {
+    dates: ['2019-03-01T17:00:00+00:00', '2019-03-08T17:00:00+00:00'],
+    duration: 'PT2H',
+    event: sampleAcademicEvents[0],
+    frequency: 'once',
+    name: 'Foo Date Event - Date Series',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.DateSeries,
+    uid: 'date-series-123',
+  },
+  {
+    dates: ['2019-03-03T10:00:00+00:00', '2019-03-11T10:00:00+00:00'],
+    duration: 'PT2H',
+    event: sampleAcademicEvents[1],
+    frequency: 'weekly',
+    name: 'Bar Date Event - Date Series',
+    origin: {
+      indexed: 'SOME-DATE',
+      name: 'some name',
+      type: SCThingOriginType.Remote,
+    },
+    type: SCThingType.DateSeries,
+    uid: 'date-series-456',
+  },
+];
+
+export const sampleThingsMap: {[key in SCThingType | string]: SCThing[]} = {
+  'academic event': sampleAcademicEvents,
+  article: sampleArticles,
+  book: sampleBooks,
+  building: sampleBuildings,
+  catalog: sampleCatalogs,
+  'course of studies': [],
+  'date series': sampleDateSeries,
+  diff: [],
+  dish: sampleDishes,
+  favorite: sampleFavorites,
+  floor: [],
+  message: sampleMessages,
+  organization: [],
+  person: samplePersons,
+  'point of interest': [],
+  room: sampleRooms,
+  semester: [],
+  setting: [],
+  'sport course': [],
+  ticket: [],
+  todo: sampleTodos,
+  tour: [],
+  video: [],
+};
+
+// provides all or certain sample things to be used in tests or backendless development
+export function getSampleThings(...uids: string[]): SCThing[] {
+  const sampleThings: SCThing[] = [];
+  if (typeof uids !== 'undefined' && uids.length > 0) {
+    uids.forEach((uid) => {
+      Object.keys(sampleThingsMap).forEach((key) => {
+        sampleThingsMap[key].forEach((thing) => {
+          if (thing.uid === uid) {
+            sampleThings.push(thing);
+          }
+        });
+      });
+    });
+  } else {
+    Object.keys(sampleThingsMap).forEach((key) => {
+      sampleThings.push(...sampleThingsMap[key]);
+    });
+  }
+  return sampleThings;
+}

src/app/_helpers/fake-backend.interceptor.ts

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018, 2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+import {HTTP_INTERCEPTORS, HttpEvent,
+  HttpHandler, HttpInterceptor, HttpRequest, HttpResponse} from '@angular/common/http';
+import {Injectable} from '@angular/core';
+import {SCThing} from '@openstapps/core';
+import {Observable, of} from 'rxjs';
+import {getSampleThings} from './data/sampleThings';
+
+@Injectable()
+export class FakeBackendInterceptor implements HttpInterceptor {
+  // tslint:disable-next-line:no-empty
+  constructor() {
+  }
+
+  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
+    let data: SCThing[] = [];
+    // fake responses for search requests for easier (backendless) development process
+    if (request.url.endsWith('/search') && request.method === 'POST') {
+      if (typeof request.body.filter !== 'undefined' && typeof request.body.filter.arguments !== 'undefined') {
+        if (request.body.filter.arguments.field === 'uid') {
+          // provide items with given uid for search requests requesting single items (detail view)
+          data = getSampleThings(request.body.filter.arguments.value);
+        }
+      } else {
+        // if filter and arguments are not set, then provide all sample items (things)
+        data = getSampleThings();
+      }
+      // fake a response of the backend with previously defined data
+      return of(new HttpResponse({status: 200, body: {data: data}}));
+    } else {
+      // for all other requests, forward the requests to actually requested URL (backend)
+      return next.handle(request);
+    }
+  }
+}
+
+export const fakeBackendProvider = {
+  multi: true,
+  provide: HTTP_INTERCEPTORS,
+  useClass: FakeBackendInterceptor,
+};

src/app/app.module.ts

@@ -23,6 +23,7 @@ import {StatusBar} from '@ionic-native/status-bar/ngx';
 import {IonicModule, IonicRouteStrategy} from '@ionic/angular';
 import {TranslateLoader, TranslateModule} from '@ngx-translate/core';
 import {TranslateHttpLoader} from '@ngx-translate/http-loader';
+import {fakeBackendProvider} from './_helpers/fake-backend.interceptor';
 import {AppRoutingModule} from './app-routing.module';
 import {AppComponent} from './app.component';
 import {ConfigModule} from './modules/config/config.module';
@@ -59,6 +60,8 @@ export function createTranslateLoader(http: HttpClient) {
     CommonModule,
   ],
   providers: [
+    // use fake backend in place of Http service for backendless development
+    fakeBackendProvider,
     StatusBar,
     SplashScreen,
     {provide: RouteReuseStrategy, useClass: IonicRouteStrategy},