Accept context via header X-Parse-Cloud-Context

CHANGELOG.md

@@ -134,6 +134,7 @@ ___
 - Add NPM package-lock version check to CI (Manuel Trezza) [#7333](https://github.com/parse-community/parse-server/pull/7333)
 - Fix incorrect LiveQuery events triggered for multiple subscriptions on the same class with different events [#7341](https://github.com/parse-community/parse-server/pull/7341)
 - Fix select and excludeKey queries to properly accept JSON string arrays. Also allow nested fields in exclude (Corey Baker) [#7242](https://github.com/parse-community/parse-server/pull/7242)
+- Add context header X-Parse-Cloud-Context (Corey Baker) [#7437](https://github.com/parse-community/parse-server/pull/7437)
 
 ___
 ## 4.5.0

spec/CloudCode.spec.js

@@ -2519,6 +2519,38 @@ describe('afterFind hooks', () => {
       });
   });
 
+  it('should expose context in beforeSave/afterSave via header', async () => {
+    let calledBefore = false;
+    let calledAfter = false;
+    Parse.Cloud.beforeSave('TestObject', req => {
+      expect(req.object.get('foo')).toEqual('bar');
+      expect(req.context.otherKey).toBe(1);
+      expect(req.context.key).toBe('value');
+      calledBefore = true;
+    });
+    Parse.Cloud.afterSave('TestObject', req => {
+      expect(req.object.get('foo')).toEqual('bar');
+      expect(req.context.otherKey).toBe(1);
+      expect(req.context.key).toBe('value');
+      calledAfter = true;
+    });
+    const req = request({
+      method: 'POST',
+      url: 'http://localhost:8378/1/classes/TestObject',
+      headers: {
+        'X-Parse-Application-Id': 'test',
+        'X-Parse-REST-API-Key': 'rest',
+        'X-Parse-Cloud-Context': '{"key":"value","otherKey":1}',
+      },
+      body: {
+        foo: 'bar',
+      },
+    });
+    await req;
+    expect(calledBefore).toBe(true);
+    expect(calledAfter).toBe(true);
+  });
+
   it('should expose context in before and afterSave', async () => {
     let calledBefore = false;
     let calledAfter = false;

src/middlewares.js

@@ -35,7 +35,7 @@ export function handleParseHeaders(req, res, next) {
     dotNetKey: req.get('X-Parse-Windows-Key'),
     restAPIKey: req.get('X-Parse-REST-API-Key'),
     clientVersion: req.get('X-Parse-Client-Version'),
-    context: {},
+    context: req.get('X-Parse-Cloud-Context') == null ? {} : JSON.parse(req.get('X-Parse-Cloud-Context')),
   };
 
   var basicAuth = httpAuth(req);