feat(placetel): Implement app structure with authentication

packages/backend/src/apps/placetel/assets/favicon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 90 90">
+  <g fill="none" fill-rule="evenodd">
+    <path d="M45 15c13.807 0 25 11.193 25 25S58.807 65 45 65 20 53.807 20 40s11.193-25 25-25Zm0 14c-6.075 0-11 4.925-11 11s4.925 11 11 11 11-4.925 11-11-4.925-11-11-11Z" fill="#069DD9" fill-rule="nonzero"/>
+    <path fill="#69B52A" d="M20 41h14v33H20z"/>
+  </g>
+</svg>

packages/backend/src/apps/placetel/auth/index.ts

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+import verifyCredentials from './verify-credentials';
+import isStillVerified from './is-still-verified';
+
+export default {
+  fields: [
+    {
+      key: 'apiToken',
+      label: 'API Token',
+      type: 'string' as const,
+      required: true,
+      readOnly: false,
+      value: null,
+      placeholder: null,
+      description: 'Placetel API Token of your account.',
+      clickToCopy: false,
+    },
+  ],
+
+  verifyCredentials,
+  isStillVerified,
+};

packages/backend/src/apps/placetel/auth/is-still-verified.ts

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+import { IGlobalVariable } from '@automatisch/types';
+import verifyCredentials from './verify-credentials';
+
+const isStillVerified = async ($: IGlobalVariable) => {
+  await verifyCredentials($);
+  return true;
+};
+
+export default isStillVerified;

packages/backend/src/apps/placetel/auth/verify-credentials.ts

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+import { IGlobalVariable } from '@automatisch/types';
+
+const verifyCredentials = async ($: IGlobalVariable) => {
+  const { data } = await $.http.get('/v2/me');
+
+  await $.auth.set({
+    screenName: `${data.name} @ ${data.company}`,
+  });
+};
+
+export default verifyCredentials;

packages/backend/src/apps/placetel/common/add-auth-header.ts

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+import { TBeforeRequest } from '@automatisch/types';
+
+const addAuthHeader: TBeforeRequest = ($, requestConfig) => {
+  if ($.auth.data?.apiToken) {
+    requestConfig.headers.Authorization = `Bearer ${$.auth.data.apiToken}`;
+  }
+
+  return requestConfig;
+};
+
+export default addAuthHeader;

packages/backend/src/apps/placetel/index.ts

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+import defineApp from '../../helpers/define-app';
+import addAuthHeader from './common/add-auth-header';
+import auth from './auth';
+
+export default defineApp({
+  name: 'Placetel',
+  key: 'placetel',
+  iconUrl: '{BASE_URL}/apps/placetel/assets/favicon.svg',
+  authDocUrl: 'https://automatisch.io/docs/apps/placetel/connection',
+  supportsConnections: true,
+  baseUrl: 'https://placetel.de',
+  apiBaseUrl: 'https://api.placetel.de',
+  primaryColor: '069dd9',
+  beforeRequest: [addAuthHeader],
+  auth,
+});