chore: add proxy backend (#3126)

* feat(backends): add proxy backend

* feat: add proxy server initial commit

* fix: move from joi to @hapi/joi

* test: add joi validation tests

* feat: proxy server initial implementations

* test: add tests, fix build

* chore: update yarn.lock

* build: fix develop command

* fix(back-proxy): fix bugs

* test(backend-proxy): add cypress tests

* chore: cleanup

* chore: support node 10

* chore: code cleanup

* chore: run cypress on ubuntu 16.04

* test(e2e): fix proxy backend cypress tests

* chore: don't start proxy server on yarn develop

packages/netlify-cms-lib-util/src/API.ts

@@ -15,6 +15,14 @@ export const parseContentKey = (contentKey: string) => {
   return { collection: contentKey.substr(0, index), slug: contentKey.substr(index + 1) };
 };
 
+export const contentKeyFromBranch = (branch: string) => {
+  return branch.substring(`${CMS_BRANCH_PREFIX}/`.length);
+};
+
+export const branchFromContentKey = (contentKey: string) => {
+  return `${CMS_BRANCH_PREFIX}/${contentKey}`;
+};
+
 export interface FetchError extends Error {
   status: number;
 }

packages/netlify-cms-lib-util/src/EditorialWorkflowError.ts

@@ -1,7 +1,9 @@
 export const EDITORIAL_WORKFLOW_ERROR = 'EDITORIAL_WORKFLOW_ERROR';
 
 export default class EditorialWorkflowError extends Error {
-  constructor(message, notUnderEditorialWorkflow) {
+  message: string;
+  notUnderEditorialWorkflow: boolean;
+  constructor(message: string, notUnderEditorialWorkflow: boolean) {
     super(message);
     this.message = message;
     this.notUnderEditorialWorkflow = notUnderEditorialWorkflow;

packages/netlify-cms-lib-util/src/implementation.ts

@@ -84,6 +84,7 @@ export type Config = {
     gateway_url?: string;
     large_media_url?: string;
     use_large_media_transforms_in_media_library?: boolean;
+    proxy_url?: string;
   };
   media_folder: string;
   base_url?: string;

packages/netlify-cms-lib-util/src/index.ts

@@ -51,6 +51,8 @@ import {
   PreviewState,
   FetchError as FE,
   parseContentKey,
+  branchFromContentKey,
+  contentKeyFromBranch,
 } from './API';
 import {
   createPointerFile,
@@ -132,6 +134,8 @@ export const NetlifyCmsLibUtil = {
   getLargeMediaPatternsFromGitAttributesFile,
   parsePointerFile,
   getPointerFileForMediaFileObj,
+  branchFromContentKey,
+  contentKeyFromBranch,
 };
 export {
   APIError,
@@ -180,4 +184,6 @@ export {
   getLargeMediaPatternsFromGitAttributesFile,
   parsePointerFile,
   getPointerFileForMediaFileObj,
+  branchFromContentKey,
+  contentKeyFromBranch,
 };