Added ability to append to documents. Added test cases for the same (#963)

* added ability to append to documents. Added test cases for the same

* made changes required for lint test

* updated snapshot for document.test.js to reflect new test cases added

* append should not enforce newline character

server/api/__snapshots__/documents.test.js.snap

@@ -107,6 +107,15 @@ Object {
 }
 `;
 
+exports[`#documents.update should require text while appending 1`] = `
+Object {
+  "error": "param_required",
+  "message": "Text is required while appending",
+  "ok": false,
+  "status": 400,
+}
+`;
+
 exports[`#documents.viewed should require authentication 1`] = `
 Object {
   "error": "authentication_required",

server/api/documents.js

@@ -600,9 +600,19 @@ router.post('documents.create', auth(), async ctx => {
 });
 
 router.post('documents.update', auth(), async ctx => {
-  const { id, title, text, publish, autosave, done, lastRevision } = ctx.body;
+  const {
+    id,
+    title,
+    text,
+    publish,
+    autosave,
+    done,
+    lastRevision,
+    append,
+  } = ctx.body;
   ctx.assertPresent(id, 'id is required');
   ctx.assertPresent(title || text, 'title or text is required');
+  if (append) ctx.assertPresent(text, 'Text is required while appending');
 
   const user = ctx.state.user;
   const document = await Document.findById(id);
@@ -615,7 +625,12 @@ router.post('documents.update', auth(), async ctx => {
 
   // Update document
   if (title) document.title = title;
-  if (text) document.text = text;
+  //append to document
+  if (append) {
+    document.text += text;
+  } else if (text) {
+    document.text = text;
+  }
   document.lastModifiedById = user.id;
 
   if (publish) {

server/api/documents.test.js

@@ -1212,6 +1212,42 @@ describe('#documents.update', async () => {
     });
     expect(res.status).toEqual(403);
   });
+
+  it('should append document with text', async () => {
+    const { user, document } = await seed();
+
+    const res = await server.post('/api/documents.update', {
+      body: {
+        token: user.getJwtToken(),
+        id: document.id,
+        text: 'Additional text',
+        lastRevision: document.revision,
+        append: true,
+      },
+    });
+    const body = await res.json();
+
+    expect(res.status).toEqual(200);
+    expect(body.data.text).toBe(document.text + 'Additional text');
+  });
+
+  it('should require text while appending', async () => {
+    const { user, document } = await seed();
+
+    const res = await server.post('/api/documents.update', {
+      body: {
+        token: user.getJwtToken(),
+        id: document.id,
+        lastRevision: document.revision,
+        title: 'Updated Title',
+        append: true,
+      },
+    });
+    const body = await res.json();
+
+    expect(res.status).toEqual(400);
+    expect(body).toMatchSnapshot();
+  });
 });
 
 describe('#documents.archive', async () => {