Allow users to update their Account in the API (#1179)

* Allow users to update their Account in the API

It would be nice for API clients to be able to allow users to update
their accounts without having to wrap Mastodon in a web view. This patch
adds an API endpoint to let users submit a PATCH for their account.

Signed-off-by: David Celis <me@davidcel.is>

* Add /api/v1/accounts/update_credentials to the API docs

Signed-off-by: David Celis <me@davidcel.is>

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -24,6 +24,39 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
     end
   end
 
+  describe 'PATCH #update_credentials' do
+    it 'returns http success' do
+      expect(user.account.avatar).not_to exist
+      expect(user.account.header).not_to exist
+
+      avatar = File.read(Rails.root.join('app', 'assets', 'images', 'logo.png'))
+      header = File.read(Rails.root.join('app', 'assets', 'images', 'mastodon-getting-started.png'))
+      params = {
+        display_name: "Alice Isn't Dead",
+        note: "Hi!\n\nToot toot!",
+        avatar: "data:image/png;base64,#{Base64.encode64(avatar)}",
+        header: "data:image/png;base64,#{Base64.encode64(header)}"
+      }
+      patch :update_credentials, params: params
+      expect(response).to have_http_status(:success)
+
+      user.reload
+
+      expect(user.account.display_name).to eq("Alice Isn't Dead")
+      expect(user.account.note).to eq("Hi!\n\nToot toot!")
+      expect(user.account.avatar).to exist
+      expect(user.account.header).to exist
+    end
+
+    it 'respects Account validations' do
+      note = "This is too long. " * 10
+      error = { error: 'The account could not be updated: Note is too long (maximum is 160 characters)' }.to_json
+      patch :update_credentials, params: { note: note }
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(response.body).to eq(error)
+    end
+  end
+
   describe 'GET #statuses' do
     it 'returns http success' do
       get :statuses, params: { id: user.account.id }