upgrading react and refactoring components (#5409) (#5444)

- upgraded react from v16.2.0
- upgraded react-router to v4.2.0 and re-writen the routes
- using prettier to format the code
- added jest to unit test components/reducers/selectors

This provides a skeleton to start of with. Only basic unit test
cases are added, remaining needs to be added.

In terms of functionality, it provides login, listing and searching
buckets. Remaining functionalities will be added in upcoming patches.

browser/app/js/actions/__tests__/alert.test.js

@@ -0,0 +1,57 @@
+/*
+ * Minio Cloud Storage (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import configureStore from "redux-mock-store"
+import thunk from "redux-thunk"
+import * as actionsAlert from "../alert"
+
+const middlewares = [thunk]
+const mockStore = configureStore(middlewares)
+
+jest.useFakeTimers()
+
+describe("Alert actions", () => {
+  it("creates alert/SET action", () => {
+    const store = mockStore()
+    const expectedActions = [
+      {
+        type: "alert/SET",
+        alert: { id: 0, message: "Test alert", type: "danger" }
+      }
+    ]
+    store.dispatch(actionsAlert.set({ message: "Test alert", type: "danger" }))
+    const actions = store.getActions()
+    expect(actions).toEqual(expectedActions)
+  })
+
+  it("creates alert/CLEAR action for non danger alerts", () => {
+    const store = mockStore()
+    const expectedActions = [
+      {
+        type: "alert/SET",
+        alert: { id: 1, message: "Test alert" }
+      },
+      {
+        type: "alert/CLEAR",
+        alert: { id: 1 }
+      }
+    ]
+    store.dispatch(actionsAlert.set({ message: "Test alert" }))
+    jest.runAllTimers()
+    const actions = store.getActions()
+    expect(actions).toEqual(expectedActions)
+  })
+})

browser/app/js/actions/__tests__/buckets.test.js

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+/*
+ * Minio Cloud Storage (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import configureStore from "redux-mock-store"
+import thunk from "redux-thunk"
+import * as actionsBuckets from "../buckets"
+
+jest.mock("../../web", () => ({
+  ListBuckets: jest.fn(() => {
+    return Promise.resolve({ buckets: [{ name: "test1" }, { name: "test2" }] })
+  })
+}))
+
+const middlewares = [thunk]
+const mockStore = configureStore(middlewares)
+
+describe("Buckets actions", () => {
+  it("creates buckets/SET_LIST after fetching the buckets", () => {
+    const store = mockStore()
+    const expectedActions = [
+      { type: "buckets/SET_LIST", buckets: ["test1", "test2"] }
+    ]
+    return store.dispatch(actionsBuckets.fetchBuckets()).then(() => {
+      const actions = store.getActions()
+      expect(actions).toEqual(expectedActions)
+    })
+  })
+})

browser/app/js/actions/alert.js

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+/*
+ * Minio Cloud Storage (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export const SET = "alert/SET"
+export const CLEAR = "alert/CLEAR"
+
+let alertId = 0
+
+export const set = alert => {
+  const id = alertId++
+  return (dispatch, getState) => {
+    if (alert.type !== "danger") {
+      setTimeout(() => {
+        dispatch({
+          type: CLEAR,
+          alert: {
+            id
+          }
+        })
+      }, 5000)
+    }
+    dispatch({
+      type: SET,
+      alert: Object.assign({}, alert, {
+        id
+      })
+    })
+  }
+}
+
+export const clear = () => {
+  return { type: CLEAR }
+}

browser/app/js/actions/buckets.js

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+/*
+ * Minio Cloud Storage (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import web from "../web"
+
+export const SET_LIST = "buckets/SET_LIST"
+export const SET_FILTER = "buckets/SET_FILTER"
+export const SET_CURRENT_BUCKET = "buckets/SET_CURRENT_BUCKET"
+
+export const fetchBuckets = () => {
+  return function(dispatch) {
+    return web.ListBuckets().then(res => {
+      const buckets = res.buckets ? res.buckets.map(bucket => bucket.name) : []
+      dispatch(setList(buckets))
+    })
+  }
+}
+
+export const setList = buckets => {
+  return {
+    type: SET_LIST,
+    buckets
+  }
+}
+
+export const setFilter = filter => {
+  return {
+    type: SET_FILTER,
+    filter
+  }
+}
+
+export const setCurrentBucket = bucket => {
+  return {
+    type: SET_CURRENT_BUCKET,
+    bucket
+  }
+}