feat: add components for external services (#376)

- Add sms and edit-sms component
- Add notification and edit-notification component
- Add email and edit-email component
- Add amazon-s3 and edit-amazon-s3 component

Fixes: #182 and Fixes: #183

src/app/system/external-services/email/edit-email/edit-email.component.ts

@@ -0,0 +1,72 @@
+/** Angular Imports */
+import { Component, OnInit } from '@angular/core';
+import { ActivatedRoute, Router } from '@angular/router';
+import { FormGroup, FormBuilder, Validators } from '@angular/forms';
+
+/** Custom Services */
+import { SystemService } from 'app/system/system.service';
+
+/**
+ * Edit Email Configuration Component.
+ */
+@Component({
+  selector: 'mifosx-edit-email',
+  templateUrl: './edit-email.component.html',
+  styleUrls: ['./edit-email.component.scss']
+})
+export class EditEmailComponent implements OnInit {
+
+  /** Email Configuration data */
+  emailConfigurationData: any;
+  /** Email Configuration Form */
+  emailConfigurationForm: FormGroup;
+
+  /**
+   * Retrieves the Email configuration data from `resolve`.
+   * @param {FormBuilder} formBuilder Form Builder.
+   * @param {SystemService} systemService Accounting Service.
+   * @param {ActivatedRoute} route Activated Route.
+   * @param {Router} router Router for navigation.
+   */
+  constructor(private formBuilder: FormBuilder,
+              private systemService: SystemService,
+              private route: ActivatedRoute,
+              private router: Router) {
+    this.route.data.subscribe((data: { emailConfiguration: any }) => {
+      this.emailConfigurationData = data.emailConfiguration;
+    });
+  }
+
+  /**
+   * Creates Email configuration form.
+   */
+  ngOnInit() {
+    this.setEmailConfigurationForm();
+  }
+
+  /**
+   * Creates Email configuration form.
+   */
+  setEmailConfigurationForm() {
+    this.emailConfigurationForm = this.formBuilder.group({
+      'username': [this.emailConfigurationData[0].value, Validators.required],
+      'password': [this.emailConfigurationData[1].value, Validators.required],
+      'host': [this.emailConfigurationData[2].value, Validators.required],
+      'port': [this.emailConfigurationData[3].value, Validators.required],
+      'useTLS': [this.emailConfigurationData[4].value, Validators.required]
+    });
+  }
+
+  /**
+   * Submits the Email configuration and updates the Email configuration,
+   * if successful redirects to view Email configuration.
+   */
+  submit() {
+    this.systemService
+      .updateExternalConfiguration('SMTP', this.emailConfigurationForm.value)
+      .subscribe((response: any) => {
+        this.router.navigate(['../'], { relativeTo: this.route });
+      });
+  }
+
+}