Merge branch '38759-fetch-available-parameters-directly-from-gke-when-creating-a-cluster' into 'master'

Resolve "Fetch available parameters directly from GKE when creating a cluster"

Closes #38759

See merge request gitlab-org/gitlab-ce!17806

23 files changed, 938 insertions, 145 deletions

diff --git a/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js b/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js
new file mode 100644
index 00000000000..d4f34e32a48
--- /dev/null
+++ b/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js
@@ -0,0 +1,5 @@
+import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
+
+document.addEventListener('DOMContentLoaded', () => {
+  initGkeDropdowns();
+});
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_dropdown_mixin.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_dropdown_mixin.js
new file mode 100644
index 00000000000..c15d8ba49e1
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_dropdown_mixin.js
@@ -0,0 +1,71 @@
+import _ from 'underscore';
+import LoadingIcon from '~/vue_shared/components/loading_icon.vue';
+import DropdownSearchInput from '~/vue_shared/components/dropdown/dropdown_search_input.vue';
+import DropdownHiddenInput from '~/vue_shared/components/dropdown/dropdown_hidden_input.vue';
+import DropdownButton from '~/vue_shared/components/dropdown/dropdown_button.vue';
+
+import store from '../store';
+
+export default {
+  store,
+  components: {
+    LoadingIcon,
+    DropdownButton,
+    DropdownSearchInput,
+    DropdownHiddenInput,
+  },
+  props: {
+    fieldId: {
+      type: String,
+      required: true,
+    },
+    fieldName: {
+      type: String,
+      required: true,
+    },
+    defaultValue: {
+      type: String,
+      required: false,
+      default: '',
+    },
+  },
+  data() {
+    return {
+      isLoading: false,
+      hasErrors: false,
+      searchQuery: '',
+      gapiError: '',
+    };
+  },
+  computed: {
+    results() {
+      if (!this.items) {
+        return [];
+      }
+
+      return this.items.filter(item => item.name.toLowerCase().indexOf(this.searchQuery) > -1);
+    },
+  },
+  methods: {
+    fetchSuccessHandler() {
+      if (this.defaultValue) {
+        const itemToSelect = _.find(this.items, item => item.name === this.defaultValue);
+
+        if (itemToSelect) {
+          this.setItem(itemToSelect.name);
+        }
+      }
+
+      this.isLoading = false;
+      this.hasErrors = false;
+    },
+    fetchFailureHandler(resp) {
+      this.isLoading = false;
+      this.hasErrors = true;
+
+      if (resp.result && resp.result.error) {
+        this.gapiError = resp.result.error.message;
+      }
+    },
+  },
+};
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_machine_type_dropdown.vue b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_machine_type_dropdown.vue
new file mode 100644
index 00000000000..6be39702546
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_machine_type_dropdown.vue
@@ -0,0 +1,142 @@
+<script>
+import { sprintf, s__ } from '~/locale';
+import { mapState, mapGetters, mapActions } from 'vuex';
+
+import gkeDropdownMixin from './gke_dropdown_mixin';
+
+export default {
+  name: 'GkeMachineTypeDropdown',
+  mixins: [gkeDropdownMixin],
+  computed: {
+    ...mapState([
+      'isValidatingProjectBilling',
+      'projectHasBillingEnabled',
+      'selectedZone',
+      'selectedMachineType',
+    ]),
+    ...mapState({ items: 'machineTypes' }),
+    ...mapGetters(['hasZone', 'hasMachineType']),
+    allDropdownsSelected() {
+      return this.projectHasBillingEnabled && this.hasZone && this.hasMachineType;
+    },
+    isDisabled() {
+      return (
+        this.isLoading ||
+        this.isValidatingProjectBilling ||
+        !this.projectHasBillingEnabled ||
+        !this.hasZone
+      );
+    },
+    toggleText() {
+      if (this.isLoading) {
+        return s__('ClusterIntegration|Fetching machine types');
+      }
+
+      if (this.selectedMachineType) {
+        return this.selectedMachineType;
+      }
+
+      if (!this.projectHasBillingEnabled && !this.hasZone) {
+        return s__('ClusterIntegration|Select project and zone to choose machine type');
+      }
+
+      return !this.hasZone
+        ? s__('ClusterIntegration|Select zone to choose machine type')
+        : s__('ClusterIntegration|Select machine type');
+    },
+    errorMessage() {
+      return sprintf(
+        s__(
+          'ClusterIntegration|An error occured while trying to fetch zone machine types: %{error}',
+        ),
+        { error: this.gapiError },
+      );
+    },
+  },
+  watch: {
+    selectedZone() {
+      this.hasErrors = false;
+
+      if (this.hasZone) {
+        this.isLoading = true;
+
+        this.fetchMachineTypes()
+          .then(this.fetchSuccessHandler)
+          .catch(this.fetchFailureHandler);
+      }
+    },
+    selectedMachineType() {
+      this.enableSubmit();
+    },
+  },
+  methods: {
+    ...mapActions(['fetchMachineTypes']),
+    ...mapActions({ setItem: 'setMachineType' }),
+    enableSubmit() {
+      if (this.allDropdownsSelected) {
+        const submitButtonEl = document.querySelector('.js-gke-cluster-creation-submit');
+
+        if (submitButtonEl) {
+          submitButtonEl.removeAttribute('disabled');
+        }
+      }
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <div
+      class="js-gcp-machine-type-dropdown dropdown"
+      :class="{ 'gl-show-field-errors': hasErrors }"
+    >
+      <dropdown-hidden-input
+        :name="fieldName"
+        :value="selectedMachineType"
+      />
+      <dropdown-button
+        :class="{ 'gl-field-error-outline': hasErrors }"
+        :is-disabled="isDisabled"
+        :is-loading="isLoading"
+        :toggle-text="toggleText"
+      />
+      <div class="dropdown-menu dropdown-select">
+        <dropdown-search-input
+          v-model="searchQuery"
+          :placeholder-text="s__('ClusterIntegration|Search machine types')"
+        />
+        <div class="dropdown-content">
+          <ul>
+            <li v-show="!results.length">
+              <span class="menu-item">
+                {{ s__('ClusterIntegration|No machine types matched your search') }}
+              </span>
+            </li>
+            <li
+              v-for="result in results"
+              :key="result.id"
+            >
+              <button
+                type="button"
+                @click.prevent="setItem(result.name)"
+              >
+                {{ result.name }}
+              </button>
+            </li>
+          </ul>
+        </div>
+        <div class="dropdown-loading">
+          <loading-icon />
+        </div>
+      </div>
+    </div>
+    <span
+      class="help-block"
+      :class="{ 'gl-field-error': hasErrors }"
+      v-if="hasErrors"
+    >
+      {{ errorMessage }}
+    </span>
+  </div>
+</template>
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_project_id_dropdown.vue b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_project_id_dropdown.vue
new file mode 100644
index 00000000000..f813a4625d6
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_project_id_dropdown.vue
@@ -0,0 +1,201 @@
+<script>
+import _ from 'underscore';
+import { s__, sprintf } from '~/locale';
+import { mapState, mapGetters, mapActions } from 'vuex';
+
+import gkeDropdownMixin from './gke_dropdown_mixin';
+
+export default {
+  name: 'GkeProjectIdDropdown',
+  mixins: [gkeDropdownMixin],
+  props: {
+    docsUrl: {
+      type: String,
+      required: true,
+    },
+  },
+  computed: {
+    ...mapState(['selectedProject', 'isValidatingProjectBilling', 'projectHasBillingEnabled']),
+    ...mapState({ items: 'projects' }),
+    ...mapGetters(['hasProject']),
+    hasOneProject() {
+      return this.items && this.items.length === 1;
+    },
+    isDisabled() {
+      return (
+        this.isLoading || this.isValidatingProjectBilling || (this.items && this.items.length < 2)
+      );
+    },
+    toggleText() {
+      if (this.isValidatingProjectBilling) {
+        return s__('ClusterIntegration|Validating project billing status');
+      }
+
+      if (this.isLoading) {
+        return s__('ClusterIntegration|Fetching projects');
+      }
+
+      if (this.hasProject) {
+        return this.selectedProject.name;
+      }
+
+      if (!this.items) {
+        return s__('ClusterIntegration|No projects found');
+      }
+
+      return s__('ClusterIntegration|Select project');
+    },
+    helpText() {
+      let message;
+      if (this.hasErrors) {
+        return this.errorMessage;
+      }
+
+      if (!this.items) {
+        message =
+          'ClusterIntegration|We were unable to fetch any projects. Ensure that you have a project on %{docsLinkStart}Google Cloud Platform%{docsLinkEnd}.';
+      }
+
+      message =
+        this.items && this.items.length
+          ? 'ClusterIntegration|To use a new project, first create one on %{docsLinkStart}Google Cloud Platform%{docsLinkEnd}.'
+          : 'ClusterIntegration|To create a cluster, first create a project on %{docsLinkStart}Google Cloud Platform%{docsLinkEnd}.';
+
+      return sprintf(
+        s__(message),
+        {
+          docsLinkEnd: '&nbsp;<i class="fa fa-external-link" aria-hidden="true"></i></a>',
+          docsLinkStart: `<a href="${_.escape(
+            this.docsUrl,
+          )}" target="_blank" rel="noopener noreferrer">`,
+        },
+        false,
+      );
+    },
+    errorMessage() {
+      if (!this.projectHasBillingEnabled) {
+        if (this.gapiError) {
+          return s__(
+            'ClusterIntegration|We could not verify that one of your projects on GCP has billing enabled. Please try again.',
+          );
+        }
+
+        return sprintf(
+          s__(
+            'This project does not have billing enabled. To create a cluster, <a href=%{linkToBilling} target="_blank" rel="noopener noreferrer">enable billing <i class="fa fa-external-link" aria-hidden="true"></i></a> and try again.',
+          ),
+          {
+            linkToBilling:
+              'https://console.cloud.google.com/freetrial?utm_campaign=2018_cpanel&utm_source=gitlab&utm_medium=referral',
+          },
+          false,
+        );
+      }
+
+      return sprintf(
+        s__('ClusterIntegration|An error occured while trying to fetch your projects: %{error}'),
+        { error: this.gapiError },
+      );
+    },
+  },
+  watch: {
+    selectedProject() {
+      this.setIsValidatingProjectBilling(true);
+
+      this.validateProjectBilling()
+        .then(this.validateProjectBillingSuccessHandler)
+        .catch(this.validateProjectBillingFailureHandler);
+    },
+  },
+  created() {
+    this.isLoading = true;
+
+    this.fetchProjects()
+      .then(this.fetchSuccessHandler)
+      .catch(this.fetchFailureHandler);
+  },
+  methods: {
+    ...mapActions(['fetchProjects', 'setIsValidatingProjectBilling', 'validateProjectBilling']),
+    ...mapActions({ setItem: 'setProject' }),
+    fetchSuccessHandler() {
+      if (this.defaultValue) {
+        const projectToSelect = _.find(this.items, item => item.projectId === this.defaultValue);
+
+        if (projectToSelect) {
+          this.setItem(projectToSelect);
+        }
+      } else if (this.items.length === 1) {
+        this.setItem(this.items[0]);
+      }
+
+      this.isLoading = false;
+      this.hasErrors = false;
+    },
+    validateProjectBillingSuccessHandler() {
+      this.hasErrors = !this.projectHasBillingEnabled;
+    },
+    validateProjectBillingFailureHandler(resp) {
+      this.hasErrors = true;
+
+      this.gapiError = resp.result ? resp.result.error.message : resp;
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <div
+      class="js-gcp-project-id-dropdown dropdown"
+      :class="{ 'gl-show-field-errors': hasErrors }"
+    >
+      <dropdown-hidden-input
+        :name="fieldName"
+        :value="selectedProject.projectId"
+      />
+      <dropdown-button
+        :class="{
+          'gl-field-error-outline': hasErrors,
+          'read-only': hasOneProject
+        }"
+        :is-disabled="isDisabled"
+        :is-loading="isLoading"
+        :toggle-text="toggleText"
+      />
+      <div class="dropdown-menu dropdown-select">
+        <dropdown-search-input
+          v-model="searchQuery"
+          :placeholder-text="s__('ClusterIntegration|Search projects')"
+        />
+        <div class="dropdown-content">
+          <ul>
+            <li v-show="!results.length">
+              <span class="menu-item">
+                {{ s__('ClusterIntegration|No projects matched your search') }}
+              </span>
+            </li>
+            <li
+              v-for="result in results"
+              :key="result.project_number"
+            >
+              <button
+                type="button"
+                @click.prevent="setItem(result)"
+              >
+                {{ result.name }}
+              </button>
+            </li>
+          </ul>
+        </div>
+        <div class="dropdown-loading">
+          <loading-icon />
+        </div>
+      </div>
+    </div>
+    <span
+      class="help-block"
+      :class="{ 'gl-field-error': hasErrors }"
+      v-html="helpText"
+    ></span>
+  </div>
+</template>
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_zone_dropdown.vue b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_zone_dropdown.vue
new file mode 100644
index 00000000000..0c63ff5dc63
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/components/gke_zone_dropdown.vue
@@ -0,0 +1,116 @@
+<script>
+import { sprintf, s__ } from '~/locale';
+import { mapState, mapActions } from 'vuex';
+
+import gkeDropdownMixin from './gke_dropdown_mixin';
+
+export default {
+  name: 'GkeZoneDropdown',
+  mixins: [gkeDropdownMixin],
+  computed: {
+    ...mapState([
+      'selectedProject',
+      'selectedZone',
+      'projects',
+      'isValidatingProjectBilling',
+      'projectHasBillingEnabled',
+    ]),
+    ...mapState({ items: 'zones' }),
+    isDisabled() {
+      return this.isLoading || this.isValidatingProjectBilling || !this.projectHasBillingEnabled;
+    },
+    toggleText() {
+      if (this.isLoading) {
+        return s__('ClusterIntegration|Fetching zones');
+      }
+
+      if (this.selectedZone) {
+        return this.selectedZone;
+      }
+
+      return !this.projectHasBillingEnabled
+        ? s__('ClusterIntegration|Select project to choose zone')
+        : s__('ClusterIntegration|Select zone');
+    },
+    errorMessage() {
+      return sprintf(
+        s__('ClusterIntegration|An error occured while trying to fetch project zones: %{error}'),
+        { error: this.gapiError },
+      );
+    },
+  },
+  watch: {
+    isValidatingProjectBilling(isValidating) {
+      this.hasErrors = false;
+
+      if (!isValidating && this.projectHasBillingEnabled) {
+        this.isLoading = true;
+
+        this.fetchZones()
+          .then(this.fetchSuccessHandler)
+          .catch(this.fetchFailureHandler);
+      }
+    },
+  },
+  methods: {
+    ...mapActions(['fetchZones']),
+    ...mapActions({ setItem: 'setZone' }),
+  },
+};
+</script>
+
+<template>
+  <div>
+    <div
+      class="js-gcp-zone-dropdown dropdown"
+      :class="{ 'gl-show-field-errors': hasErrors }"
+    >
+      <dropdown-hidden-input
+        :name="fieldName"
+        :value="selectedZone"
+      />
+      <dropdown-button
+        :class="{ 'gl-field-error-outline': hasErrors }"
+        :is-disabled="isDisabled"
+        :is-loading="isLoading"
+        :toggle-text="toggleText"
+      />
+      <div class="dropdown-menu dropdown-select">
+        <dropdown-search-input
+          v-model="searchQuery"
+          :placeholder-text="s__('ClusterIntegration|Search zones')"
+        />
+        <div class="dropdown-content">
+          <ul>
+            <li v-show="!results.length">
+              <span class="menu-item">
+                {{ s__('ClusterIntegration|No zones matched your search') }}
+              </span>
+            </li>
+            <li
+              v-for="result in results"
+              :key="result.id"
+            >
+              <button
+                type="button"
+                @click.prevent="setItem(result.name)"
+              >
+                {{ result.name }}
+              </button>
+            </li>
+          </ul>
+        </div>
+        <div class="dropdown-loading">
+          <loading-icon />
+        </div>
+      </div>
+    </div>
+    <span
+      class="help-block"
+      :class="{ 'gl-field-error': hasErrors }"
+      v-if="hasErrors"
+    >
+      {{ errorMessage }}
+    </span>
+  </div>
+</template>
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/constants.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/constants.js
new file mode 100644
index 00000000000..2a1c0819916
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/constants.js
@@ -0,0 +1,11 @@
+import { s__ } from '~/locale';
+
+export const GCP_API_ERROR = s__(
+  'ClusterIntegration|An error occurred when trying to contact the Google Cloud API. Please try again later.',
+);
+export const GCP_API_CLOUD_BILLING_ENDPOINT =
+  'https://www.googleapis.com/discovery/v1/apis/cloudbilling/v1/rest';
+export const GCP_API_CLOUD_RESOURCE_MANAGER_ENDPOINT =
+  'https://www.googleapis.com/discovery/v1/apis/cloudresourcemanager/v1/rest';
+export const GCP_API_COMPUTE_ENDPOINT =
+  'https://www.googleapis.com/discovery/v1/apis/compute/v1/rest';
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/index.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/index.js
new file mode 100644
index 00000000000..729b9404b64
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/index.js
@@ -0,0 +1,88 @@
+/* global gapi */
+import Vue from 'vue';
+import Flash from '~/flash';
+import GkeProjectIdDropdown from './components/gke_project_id_dropdown.vue';
+import GkeZoneDropdown from './components/gke_zone_dropdown.vue';
+import GkeMachineTypeDropdown from './components/gke_machine_type_dropdown.vue';
+import * as CONSTANTS from './constants';
+
+const mountComponent = (entryPoint, component, componentName, extraProps = {}) => {
+  const el = document.querySelector(entryPoint);
+  if (!el) return false;
+
+  const hiddenInput = el.querySelector('input');
+
+  return new Vue({
+    el,
+    components: {
+      [componentName]: component,
+    },
+    render: createElement =>
+      createElement(componentName, {
+        props: {
+          fieldName: hiddenInput.getAttribute('name'),
+          fieldId: hiddenInput.getAttribute('id'),
+          defaultValue: hiddenInput.value,
+          ...extraProps,
+        },
+      }),
+  });
+};
+
+const mountGkeProjectIdDropdown = () => {
+  const entryPoint = '.js-gcp-project-id-dropdown-entry-point';
+  const el = document.querySelector(entryPoint);
+
+  mountComponent(entryPoint, GkeProjectIdDropdown, 'gke-project-id-dropdown', {
+    docsUrl: el.dataset.docsurl,
+  });
+};
+
+const mountGkeZoneDropdown = () => {
+  mountComponent('.js-gcp-zone-dropdown-entry-point', GkeZoneDropdown, 'gke-zone-dropdown');
+};
+
+const mountGkeMachineTypeDropdown = () => {
+  mountComponent(
+    '.js-gcp-machine-type-dropdown-entry-point',
+    GkeMachineTypeDropdown,
+    'gke-machine-type-dropdown',
+  );
+};
+
+const gkeDropdownErrorHandler = () => {
+  Flash(CONSTANTS.GCP_API_ERROR);
+};
+
+const initializeGapiClient = () => {
+  const el = document.querySelector('.js-gke-cluster-creation');
+  if (!el) return false;
+
+  return gapi.client
+    .init({
+      discoveryDocs: [
+        CONSTANTS.GCP_API_CLOUD_BILLING_ENDPOINT,
+        CONSTANTS.GCP_API_CLOUD_RESOURCE_MANAGER_ENDPOINT,
+        CONSTANTS.GCP_API_COMPUTE_ENDPOINT,
+      ],
+    })
+    .then(() => {
+      gapi.client.setToken({ access_token: el.dataset.token });
+
+      mountGkeProjectIdDropdown();
+      mountGkeZoneDropdown();
+      mountGkeMachineTypeDropdown();
+    })
+    .catch(gkeDropdownErrorHandler);
+};
+
+const initGkeDropdowns = () => {
+  if (!gapi) {
+    gkeDropdownErrorHandler();
+    return false;
+  }
+
+  return gapi.load('client', initializeGapiClient);
+};
+
+export default initGkeDropdowns;
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/actions.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/actions.js
new file mode 100644
index 00000000000..4834a856271
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/actions.js
@@ -0,0 +1,95 @@
+/* global gapi */
+import * as types from './mutation_types';
+
+const gapiResourceListRequest = ({ resource, params, commit, mutation, payloadKey }) =>
+  new Promise((resolve, reject) => {
+    const request = resource.list(params);
+
+    return request.then(
+      resp => {
+        const { result } = resp;
+
+        commit(mutation, result[payloadKey]);
+
+        resolve();
+      },
+      resp => {
+        reject(resp);
+      },
+    );
+  });
+
+export const setProject = ({ commit }, selectedProject) => {
+  commit(types.SET_PROJECT, selectedProject);
+};
+
+export const setZone = ({ commit }, selectedZone) => {
+  commit(types.SET_ZONE, selectedZone);
+};
+
+export const setMachineType = ({ commit }, selectedMachineType) => {
+  commit(types.SET_MACHINE_TYPE, selectedMachineType);
+};
+
+export const setIsValidatingProjectBilling = ({ commit }, isValidatingProjectBilling) => {
+  commit(types.SET_IS_VALIDATING_PROJECT_BILLING, isValidatingProjectBilling);
+};
+
+export const fetchProjects = ({ commit }) =>
+  gapiResourceListRequest({
+    resource: gapi.client.cloudresourcemanager.projects,
+    params: {},
+    commit,
+    mutation: types.SET_PROJECTS,
+    payloadKey: 'projects',
+  });
+
+export const validateProjectBilling = ({ dispatch, commit, state }) =>
+  new Promise((resolve, reject) => {
+    const request = gapi.client.cloudbilling.projects.getBillingInfo({
+      name: `projects/${state.selectedProject.projectId}`,
+    });
+
+    commit(types.SET_ZONE, '');
+    commit(types.SET_MACHINE_TYPE, '');
+
+    return request.then(
+      resp => {
+        const { billingEnabled } = resp.result;
+
+        commit(types.SET_PROJECT_BILLING_STATUS, !!billingEnabled);
+        dispatch('setIsValidatingProjectBilling', false);
+        resolve();
+      },
+      resp => {
+        dispatch('setIsValidatingProjectBilling', false);
+        reject(resp);
+      },
+    );
+  });
+
+export const fetchZones = ({ commit, state }) =>
+  gapiResourceListRequest({
+    resource: gapi.client.compute.zones,
+    params: {
+      project: state.selectedProject.projectId,
+    },
+    commit,
+    mutation: types.SET_ZONES,
+    payloadKey: 'items',
+  });
+
+export const fetchMachineTypes = ({ commit, state }) =>
+  gapiResourceListRequest({
+    resource: gapi.client.compute.machineTypes,
+    params: {
+      project: state.selectedProject.projectId,
+      zone: state.selectedZone,
+    },
+    commit,
+    mutation: types.SET_MACHINE_TYPES,
+    payloadKey: 'items',
+  });
+
+// prevent babel-plugin-rewire from generating an invalid default during karma tests
+export default () => {};
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/getters.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/getters.js
new file mode 100644
index 00000000000..e39f02d0894
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/getters.js
@@ -0,0 +1,3 @@
+export const hasProject = state => !!state.selectedProject.projectId;
+export const hasZone = state => !!state.selectedZone;
+export const hasMachineType = state => !!state.selectedMachineType;
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/index.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/index.js
new file mode 100644
index 00000000000..5f72060633e
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/index.js
@@ -0,0 +1,18 @@
+import Vue from 'vue';
+import Vuex from 'vuex';
+import * as actions from './actions';
+import * as getters from './getters';
+import mutations from './mutations';
+import createState from './state';
+
+Vue.use(Vuex);
+
+export const createStore = () =>
+  new Vuex.Store({
+    actions,
+    getters,
+    mutations,
+    state: createState(),
+  });
+
+export default createStore();
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutation_types.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutation_types.js
new file mode 100644
index 00000000000..45a91efc2d9
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutation_types.js
@@ -0,0 +1,8 @@
+export const SET_PROJECT = 'SET_PROJECT';
+export const SET_PROJECT_BILLING_STATUS = 'SET_PROJECT_BILLING_STATUS';
+export const SET_IS_VALIDATING_PROJECT_BILLING = 'SET_IS_VALIDATING_PROJECT_BILLING';
+export const SET_ZONE = 'SET_ZONE';
+export const SET_MACHINE_TYPE = 'SET_MACHINE_TYPE';
+export const SET_PROJECTS = 'SET_PROJECTS';
+export const SET_ZONES = 'SET_ZONES';
+export const SET_MACHINE_TYPES = 'SET_MACHINE_TYPES';
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutations.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutations.js
new file mode 100644
index 00000000000..88a2c1b630d
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/mutations.js
@@ -0,0 +1,28 @@
+import * as types from './mutation_types';
+
+export default {
+  [types.SET_PROJECT](state, selectedProject) {
+    Object.assign(state, { selectedProject });
+  },
+  [types.SET_IS_VALIDATING_PROJECT_BILLING](state, isValidatingProjectBilling) {
+    Object.assign(state, { isValidatingProjectBilling });
+  },
+  [types.SET_PROJECT_BILLING_STATUS](state, projectHasBillingEnabled) {
+    Object.assign(state, { projectHasBillingEnabled });
+  },
+  [types.SET_ZONE](state, selectedZone) {
+    Object.assign(state, { selectedZone });
+  },
+  [types.SET_MACHINE_TYPE](state, selectedMachineType) {
+    Object.assign(state, { selectedMachineType });
+  },
+  [types.SET_PROJECTS](state, projects) {
+    Object.assign(state, { projects });
+  },
+  [types.SET_ZONES](state, zones) {
+    Object.assign(state, { zones });
+  },
+  [types.SET_MACHINE_TYPES](state, machineTypes) {
+    Object.assign(state, { machineTypes });
+  },
+};
diff --git a/app/assets/javascripts/projects/gke_cluster_dropdowns/store/state.js b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/state.js
new file mode 100644
index 00000000000..9f3c473d4bc
--- /dev/null
+++ b/app/assets/javascripts/projects/gke_cluster_dropdowns/store/state.js
@@ -0,0 +1,13 @@
+export default () => ({
+  selectedProject: {
+    projectId: '',
+    name: '',
+  },
+  selectedZone: '',
+  selectedMachineType: '',
+  isValidatingProjectBilling: null,
+  projectHasBillingEnabled: null,
+  projects: [],
+  zones: [],
+  machineTypes: [],
+});
diff --git a/app/assets/javascripts/vue_shared/components/dropdown/dropdown_button.vue b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_button.vue
new file mode 100644
index 00000000000..c159333d89a
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_button.vue
@@ -0,0 +1,55 @@
+<script>
+import { __ } from '~/locale';
+import LoadingIcon from '~/vue_shared/components/loading_icon.vue';
+
+export default {
+  components: {
+    LoadingIcon,
+  },
+  props: {
+    isDisabled: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    isLoading: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    toggleText: {
+      type: String,
+      required: false,
+      default: __('Select'),
+    },
+  },
+};
+</script>
+
+<template>
+  <button
+    class="dropdown-menu-toggle dropdown-menu-full-width"
+    type="button"
+    data-toggle="dropdown"
+    aria-expanded="false"
+    :disabled="isDisabled || isLoading"
+  >
+    <loading-icon
+      v-show="isLoading"
+      :inline="true"
+    />
+    <span class="dropdown-toggle-text">
+      {{ toggleText }}
+    </span>
+    <span
+      class="dropdown-toggle-icon"
+      v-show="!isLoading"
+    >
+      <i
+        class="fa fa-chevron-down"
+        aria-hidden="true"
+        data-hidden="true"
+      ></i>
+    </span>
+  </button>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_hidden_input.vue b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_hidden_input.vue
index 1832c3c1757..1fe27eb97ab 100644
--- a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_hidden_input.vue
+++ b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_hidden_input.vue
@@ -5,8 +5,8 @@ export default {
       type: String,
       required: true,
     },
-    label: {
-      type: Object,
+    value: {
+      type: [Number, String],
       required: true,
     },
   },
@@ -17,6 +17,6 @@ export default {
   <input
     type="hidden"
     :name="name"
-    :value="label.id"
+    :value="value"
   />
 </template>
diff --git a/app/assets/javascripts/vue_shared/components/dropdown/dropdown_search_input.vue b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_search_input.vue
new file mode 100644
index 00000000000..c2145a26e64
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/dropdown/dropdown_search_input.vue
@@ -0,0 +1,46 @@
+<script>
+import { __ } from '~/locale';
+
+export default {
+  props: {
+    placeholderText: {
+      type: String,
+      required: true,
+      default: __('Search'),
+    },
+  },
+  data() {
+    return { searchQuery: this.value };
+  },
+  watch: {
+    searchQuery(query) {
+      this.$emit('input', query);
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="dropdown-input">
+    <input
+      class="dropdown-input-field"
+      type="search"
+      v-model="searchQuery"
+      :placeholder="placeholderText"
+      autocomplete="off"
+    />
+    <i
+      class="fa fa-search dropdown-input-search"
+      aria-hidden="true"
+      data-hidden="true"
+    >
+    </i>
+    <i
+      class="fa fa-times dropdown-input-clear js-dropdown-input-clear"
+      aria-hidden="true"
+      data-hidden="true"
+      role="button"
+    >
+    </i>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/base.vue b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/base.vue
index 70b46a9c2bb..f155ac2be02 100644
--- a/app/assets/javascripts/vue_shared/components/sidebar/labels_select/base.vue
+++ b/app/assets/javascripts/vue_shared/components/sidebar/labels_select/base.vue
@@ -2,13 +2,13 @@
 import $ from 'jquery';
 import { __ } from '~/locale';
 import LabelsSelect from '~/labels_select';
+import DropdownHiddenInput from '~/vue_shared/components/dropdown/dropdown_hidden_input.vue';
 import LoadingIcon from '../../loading_icon.vue';
 
 import DropdownTitle from './dropdown_title.vue';
 import DropdownValue from './dropdown_value.vue';
 import DropdownValueCollapsed from './dropdown_value_collapsed.vue';
 import DropdownButton from './dropdown_button.vue';
-import DropdownHiddenInput from './dropdown_hidden_input.vue';
 import DropdownHeader from './dropdown_header.vue';
 import DropdownSearchInput from './dropdown_search_input.vue';
 import DropdownFooter from './dropdown_footer.vue';
@@ -140,7 +140,7 @@ export default {
         v-for="label in context.labels"
         :key="label.id"
         :name="hiddenInputName"
-        :label="label"
+        :value="label.id"
       />
       <div
         class="dropdown"
diff --git a/app/assets/stylesheets/framework/dropdowns.scss b/app/assets/stylesheets/framework/dropdowns.scss
index 1570b1f2eaa..b91d579cae6 100644
--- a/app/assets/stylesheets/framework/dropdowns.scss
+++ b/app/assets/stylesheets/framework/dropdowns.scss
@@ -63,6 +63,10 @@
   border-radius: $border-radius-base;
   white-space: nowrap;
 
+  &:disabled.read-only {
+    color: $gl-text-color !important;
+  }
+
   &.no-outline {
     outline: 0;
   }
diff --git a/app/controllers/projects/clusters/gcp_controller.rb b/app/controllers/projects/clusters/gcp_controller.rb
index 6b0b22f8e73..c2c5ad61e01 100644
--- a/app/controllers/projects/clusters/gcp_controller.rb
+++ b/app/controllers/projects/clusters/gcp_controller.rb
@@ -1,9 +1,8 @@
 class Projects::Clusters::GcpController < Projects::ApplicationController
   before_action :authorize_read_cluster!
-  before_action :authorize_google_api, except: [:login]
-  before_action :authorize_google_project_billing, only: [:new, :create]
   before_action :authorize_create_cluster!, only: [:new, :create]
-  before_action :verify_billing, only: [:create]
+  before_action :authorize_google_api, except: :login
+  helper_method :token_in_session
 
   def login
     begin
@@ -37,21 +36,6 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
 
   private
 
-  def verify_billing
-    case google_project_billing_status
-    when nil
-      flash.now[:alert] = _('We could not verify that one of your projects on GCP has billing enabled. Please try again.')
-    when false
-      flash.now[:alert] = _('Please <a href=%{link_to_billing} target="_blank" rel="noopener noreferrer">enable billing for one of your projects to be able to create a Kubernetes cluster</a>, then try again.').html_safe % { link_to_billing: "https://console.cloud.google.com/freetrial?utm_campaign=2018_cpanel&utm_source=gitlab&utm_medium=referral" }
-    when true
-      return
-    end
-
-    @cluster = ::Clusters::Cluster.new(create_params)
-
-    render :new
-  end
-
   def create_params
     params.require(:cluster).permit(
       :enabled,
@@ -75,18 +59,8 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
     end
   end
 
-  def authorize_google_project_billing
-    redis_token_key = CheckGcpProjectBillingWorker.store_session_token(token_in_session)
-    CheckGcpProjectBillingWorker.perform_async(redis_token_key)
-  end
-
-  def google_project_billing_status
-    CheckGcpProjectBillingWorker.get_billing_state(token_in_session)
-  end
-
   def token_in_session
-    @token_in_session ||=
-      session[GoogleApi::CloudPlatform::Client.session_key_for_token]
+    session[GoogleApi::CloudPlatform::Client.session_key_for_token]
   end
 
   def expires_at_in_session
diff --git a/app/services/check_gcp_project_billing_service.rb b/app/services/check_gcp_project_billing_service.rb
deleted file mode 100644
index ea82b61b279..00000000000
--- a/app/services/check_gcp_project_billing_service.rb
+++ /dev/null
@@ -1,11 +0,0 @@
-class CheckGcpProjectBillingService
-  def execute(token)
-    client = GoogleApi::CloudPlatform::Client.new(token, nil)
-    client.projects_list.select do |project|
-      begin
-        client.projects_get_billing_info(project.project_id).billing_enabled
-      rescue
-      end
-    end
-  end
-end
diff --git a/app/views/projects/clusters/gcp/_form.html.haml b/app/views/projects/clusters/gcp/_form.html.haml
index 5739a57dcfe..be58a844f70 100644
--- a/app/views/projects/clusters/gcp/_form.html.haml
+++ b/app/views/projects/clusters/gcp/_form.html.haml
@@ -1,8 +1,10 @@
+= javascript_include_tag 'https://apis.google.com/js/api.js'
+
 %p
   - link_to_help_page = link_to(s_('ClusterIntegration|help page'), help_page_path('user/project/clusters/index'), target: '_blank', rel: 'noopener noreferrer')
   = s_('ClusterIntegration|Read our %{link_to_help_page} on Kubernetes cluster integration.').html_safe % { link_to_help_page: link_to_help_page}
 
-= form_for @cluster, html: { class: 'prepend-top-20' }, url: gcp_namespace_project_clusters_path(@project.namespace, @project), as: :cluster do |field|
+= form_for @cluster, html: { class: 'js-gke-cluster-creation prepend-top-20', data: { token: token_in_session } }, url: gcp_namespace_project_clusters_path(@project.namespace, @project), as: :cluster do |field|
   = form_errors(@cluster)
   .form-group
     = field.label :name, s_('ClusterIntegration|Kubernetes cluster name')
@@ -14,13 +16,25 @@
   = field.fields_for :provider_gcp, @cluster.provider_gcp do |provider_gcp_field|
     .form-group
       = provider_gcp_field.label :gcp_project_id, s_('ClusterIntegration|Google Cloud Platform project ID')
-      = link_to(s_('ClusterIntegration|See your projects'), 'https://console.cloud.google.com/home/dashboard', target: '_blank', rel: 'noopener noreferrer')
-      = provider_gcp_field.text_field :gcp_project_id, class: 'form-control', placeholder: s_('ClusterIntegration|Project ID')
+      .js-gcp-project-id-dropdown-entry-point{ data: { docsUrl: 'https://console.cloud.google.com/home/dashboard' } }
+        = provider_gcp_field.hidden_field :gcp_project_id
+        .dropdown
+          %button.dropdown-menu-toggle.dropdown-menu-full-width{ type: 'button', disabled: true }
+            %span.dropdown-toggle-text
+              = _('Select project')
+            = icon('chevron-down')
+        %span.help-block &nbsp;
 
     .form-group
       = provider_gcp_field.label :zone, s_('ClusterIntegration|Zone')
       = link_to(s_('ClusterIntegration|See zones'), 'https://cloud.google.com/compute/docs/regions-zones/regions-zones', target: '_blank', rel: 'noopener noreferrer')
-      = provider_gcp_field.text_field :zone, class: 'form-control', placeholder: 'us-central1-a'
+      .js-gcp-zone-dropdown-entry-point
+        = provider_gcp_field.hidden_field :zone
+        .dropdown
+          %button.dropdown-menu-toggle.dropdown-menu-full-width{ type: 'button', disabled: true }
+            %span.dropdown-toggle-text
+              = _('Select project to choose zone')
+            = icon('chevron-down')
 
     .form-group
       = provider_gcp_field.label :num_nodes, s_('ClusterIntegration|Number of nodes')
@@ -28,8 +42,13 @@
 
     .form-group
       = provider_gcp_field.label :machine_type, s_('ClusterIntegration|Machine type')
-      = link_to(s_('ClusterIntegration|See machine types'), 'https://cloud.google.com/compute/docs/machine-types', target: '_blank', rel: 'noopener noreferrer')
-      = provider_gcp_field.text_field :machine_type, class: 'form-control', placeholder: 'n1-standard-4'
+      .js-gcp-machine-type-dropdown-entry-point
+        = provider_gcp_field.hidden_field :machine_type
+        .dropdown
+          %button.dropdown-menu-toggle.dropdown-menu-full-width{ type: 'button', disabled: true }
+            %span.dropdown-toggle-text
+              = _('Select project and zone to choose machine type')
+            = icon('chevron-down')
 
     .form-group
-      = field.submit s_('ClusterIntegration|Create Kubernetes cluster'), class: 'btn btn-success'
+      = field.submit s_('ClusterIntegration|Create Kubernetes cluster'), class: 'js-gke-cluster-creation-submit btn btn-success', disabled: true
diff --git a/app/workers/all_queues.yml b/app/workers/all_queues.yml
index d07865a4043..93e57512edb 100644
--- a/app/workers/all_queues.yml
+++ b/app/workers/all_queues.yml
@@ -24,7 +24,6 @@
 - gcp_cluster:cluster_provision
 - gcp_cluster:cluster_wait_for_app_installation
 - gcp_cluster:wait_for_cluster_creation
-- gcp_cluster:check_gcp_project_billing
 - gcp_cluster:cluster_wait_for_ingress_ip_address
 
 - github_import_advance_stage
diff --git a/app/workers/check_gcp_project_billing_worker.rb b/app/workers/check_gcp_project_billing_worker.rb
deleted file mode 100644
index 363f81590ab..00000000000
--- a/app/workers/check_gcp_project_billing_worker.rb
+++ /dev/null
@@ -1,92 +0,0 @@
-require 'securerandom'
-
-class CheckGcpProjectBillingWorker
-  include ApplicationWorker
-  include ClusterQueue
-
-  LEASE_TIMEOUT = 3.seconds.to_i
-  SESSION_KEY_TIMEOUT = 5.minutes
-  BILLING_TIMEOUT = 1.hour
-  BILLING_CHANGED_LABELS = { state_transition: nil }.freeze
-
-  def self.get_session_token(token_key)
-    Gitlab::Redis::SharedState.with do |redis|
-      redis.get(get_redis_session_key(token_key))
-    end
-  end
-
-  def self.store_session_token(token)
-    generate_token_key.tap do |token_key|
-      Gitlab::Redis::SharedState.with do |redis|
-        redis.set(get_redis_session_key(token_key), token, ex: SESSION_KEY_TIMEOUT)
-      end
-    end
-  end
-
-  def self.get_billing_state(token)
-    Gitlab::Redis::SharedState.with do |redis|
-      value = redis.get(redis_shared_state_key_for(token))
-      ActiveRecord::Type::Boolean.new.type_cast_from_user(value)
-    end
-  end
-
-  def perform(token_key)
-    return unless token_key
-
-    token = self.class.get_session_token(token_key)
-    return unless token
-    return unless try_obtain_lease_for(token)
-
-    billing_enabled_state = !CheckGcpProjectBillingService.new.execute(token).empty?
-    update_billing_change_counter(self.class.get_billing_state(token), billing_enabled_state)
-    self.class.set_billing_state(token, billing_enabled_state)
-  end
-
-  private
-
-  def self.generate_token_key
-    SecureRandom.uuid
-  end
-
-  def self.get_redis_session_key(token_key)
-    "gitlab:gcp:session:#{token_key}"
-  end
-
-  def self.redis_shared_state_key_for(token)
-    "gitlab:gcp:#{Digest::SHA1.hexdigest(token)}:billing_enabled"
-  end
-
-  def self.set_billing_state(token, value)
-    Gitlab::Redis::SharedState.with do |redis|
-      redis.set(redis_shared_state_key_for(token), value, ex: BILLING_TIMEOUT)
-    end
-  end
-
-  def try_obtain_lease_for(token)
-    Gitlab::ExclusiveLease
-      .new("check_gcp_project_billing_worker:#{token.hash}", timeout: LEASE_TIMEOUT)
-      .try_obtain
-  end
-
-  def billing_changed_counter
-    @billing_changed_counter ||= Gitlab::Metrics.counter(
-      :gcp_billing_change_count,
-      "Counts the number of times a GCP project changed billing_enabled state from false to true",
-      BILLING_CHANGED_LABELS
-    )
-  end
-
-  def state_transition(previous_state, current_state)
-    if previous_state.nil? && !current_state
-      'no_billing'
-    elsif previous_state.nil? && current_state
-      'with_billing'
-    elsif !previous_state && current_state
-      'billing_configured'
-    end
-  end
-
-  def update_billing_change_counter(previous_state, current_state)
-    billing_changed_counter.increment(state_transition: state_transition(previous_state, current_state))
-  end
-end