Added ability to update or set the identity of an existing user, like the…

lib/api/users.rb

@@ -121,6 +121,17 @@ module API
             User.where(username: attrs[:username]).
                 where.not(id: user.id).count > 0
 
+        identity_attrs = attributes_for_keys [:provider, :extern_uid]
+        if identity_attrs.any?
+          identity = user.identities.find_by(provider: identity_attrs[:provider])
+          if identity
+            identity.update_attributes(identity_attrs)
+          else
+            identity = user.identities.build(identity_attrs)
+            identity.save
+          end
+        end
+
         if user.update_attributes(attrs)
           present user, with: Entities::UserFull
         else

spec/requests/api/users_spec.rb

@@ -7,6 +7,7 @@ describe API::API, api: true  do
   let(:admin) { create(:admin) }
   let(:key)   { create(:key, user: user) }
   let(:email)   { create(:email, user: user) }
+  let(:omniauth_user) { create(:omniauth_user) }
 
   describe "GET /users" do
     context "when unauthenticated" do
@@ -230,6 +231,19 @@ describe API::API, api: true  do
       expect(user.reload.username).to eq(user.username)
     end
 
+    it "should update user's existing identity" do
+      put api("/users/#{omniauth_user.id}", admin), provider: 'ldapmain', extern_uid: '654321'
+      expect(response.status).to eq(200)
+      expect(omniauth_user.reload.identities.first.extern_uid).to eq('654321')
+    end
+
+    it 'should update user with new identity' do
+      put api("/users/#{user.id}", admin), provider: 'github', extern_uid: '67890'
+      expect(response.status).to eq(200)
+      expect(user.reload.identities.first.extern_uid).to eq('67890')
+      expect(user.reload.identities.first.provider).to eq('github')
+    end
+
     it "should update admin status" do
       put api("/users/#{user.id}", admin), { admin: true }
       expect(response.status).to eq(200)