group api

+import json
+import uuid
+from django.utils import timezone
+from ..aws import s3_delete
+from ..models import File, Group, GroupUser, User
+
+
 # 그룹 생성
 def create(request):
-    return {'result': True}
+    # TODO: Auth
+    request.user_id = 1
+
+    # Load
+    try:
+        received = json.loads(request.body.decode('utf-8'))
+    except json.decoder.JSONDecodeError:
+        return {'result': False, 'error': '입력이 잘못되었습니다.'}
+
+    # Validate
+    if 'name' not in received or received['name'] == '':
+        return {'result': False, 'error': '입력이 누락되었습니다.'}
+
+    # Create
+    root_folder = uuid.uuid4()
+    group = Group.objects.create(
+        owner_id=request.user_id,
+        name=received['name'],
+        root_folder=root_folder,
+        invite_code=uuid.uuid4(),
+        created_at=timezone.now()
+    )
+    GroupUser.objects.create(
+        group_id=group.id,
+        user_id=request.user_id,
+        joined_at=timezone.now()
+    )
+    File.objects.create(
+        id=root_folder,
+        owner_user_id=request.user_id,
+        owner_group_id=group.id,
+        type='folder',
+        name='group_%s' % group.id,
+        size=0,
+        created_at=timezone.now()
+    )
+
+    return {'result': True, 'group_id': group.id}
 
 
 # 그룹 초대장 조회
 def find_invite(request, invite_code):
-    return {'result': True}
+    # TODO: Auth
+    request.user_id = 1
+
+    # Query
+    group = Group.objects.filter(invite_code=invite_code)
+
+    # Check Exists
+    if len(group) == 0:
+        return {'result': False, 'error': '존재하지 않는 초대장입니다.'}
+
+    # Structure
+    data = {
+        'id': group[0].id,
+        'name': group[0].name
+    }
+
+    # Check Joined
+    joined = GroupUser.objects.filter(group_id=group[0].id, user_id=request.user_id)
+    if len(joined) == 0:
+        data['joined'] = False
+    else:
+        data['joined'] = True
+
+    return {'result': True, 'data': data}
 
 
 # 그룹 초대장 사용
 def use_invite(request, invite_code):
+    # TODO: Auth
+    request.user_id = 1
+
+    # Query
+    group = Group.objects.filter(invite_code=invite_code)
+
+    # Check Exists
+    if len(group) == 0:
+        return {'result': False, 'error': '존재하지 않는 초대장입니다.'}
+
+    # Check Joined
+    joined = GroupUser.objects.filter(group_id=group[0].id, user_id=request.user_id)
+    if len(joined) != 0:
+        return {'result': False, 'error': '이미 가입된 그룹입니다.'}
+
+    # Join
+    GroupUser.objects.create(
+        group_id=group[0].id,
+        user_id=request.user_id,
+        joined_at=timezone.now()
+    )
+
     return {'result': True}
 
 
 # 그룹 목록
 def list_me(request):
-    return {'result': True}
+    # TODO: Auth
+    request.user_id = 1
+
+    # Query
+    joined = GroupUser.objects.filter(user_id=request.user_id).values_list('group_id', flat=True)
+    groups = Group.objects.filter(id__in=joined)
+
+    # Structure
+    data = []
+    for group in groups:
+        data.append({
+            'id': group.id,
+            'name': group.name,
+            'root_folder': group.root_folder,
+        })
+
+    return {'result': True, 'data': data}
 
 
 # 그룹 조회
 def find_item(request, group_id):
-    return {'result': True}
+    # TODO: Auth
+    request.user_id = 1
+
+    # Check Joined
+    joined = GroupUser.objects.filter(group_id=group_id, user_id=request.user_id)
+    if len(joined) == 0:
+        return {'result': False, 'error': '입력이 잘못되었습니다.'}
+
+    # Query
+    group = Group.objects.filter(id=group_id)
+
+    # Check Exists
+    if len(group) == 0:
+        return {'result': False, 'error': '존재하지 않는 그룹입니다.'}
+
+    # Structure
+    data = {
+        'id': group[0].id,
+        'name': group[0].name,
+        'root_folder': group[0].root_folder,
+    }
+
+    # If Owner
+    if group[0].owner_id == request.user_id:
+        user_ids = GroupUser.objects.filter(group_id=group_id).values_list('user_id', flat=True)
+        users = User.objects.filter(id__in=user_ids)
+        user_data = []
+        for user in users:
+            user_data.append({
+                'id': user.id,
+                'name': user.name,
+            })
+        data['user'] = user_data
+        data['invite_code'] = group[0].invite_code
+        data['created_at'] = group[0].created_at
+        data['is_owner'] = True
+
+    return {'result': True, 'data': data}
 
 
 # 그룹 수정
 def update_item(request, group_id):
+    # TODO: Auth
+    request.user_id = 1
+
+    # Load
+    try:
+        received = json.loads(request.body.decode('utf-8'))
+    except json.decoder.JSONDecodeError:
+        return {'result': False, 'error': '입력이 잘못되었습니다.'}
+
+    # Validate
+    if 'name' not in received or received['name'] == '':
+        return {'result': False, 'error': '입력이 누락되었습니다.'}
+
+    # Query
+    group = Group.objects.filter(id=group_id)
+
+    # Check Exists
+    if len(group) == 0:
+        return {'result': False, 'error': '존재하지 않는 그룹입니다.'}
+
+    # Check Owner
+    if group[0].owner_id != request.user_id:
+        return {'result': False, 'error': '권한이 없습니다.'}
+
+    # Update
+    group[0].name = received['name']
+    group[0].save()
+
     return {'result': True}
 
 
 # 그룹 삭제
 def delete_item(request, group_id):
+    # TODO: Auth
+    request.user_id = 1
+
+    # Query
+    group = Group.objects.filter(id=group_id)
+
+    # Check Exists
+    if len(group) == 0:
+        return {'result': False, 'error': '존재하지 않는 그룹입니다.'}
+
+    # Check Owner
+    if group[0].owner_id != request.user_id:
+        return {'result': False, 'error': '권한이 없습니다.'}
+
+    # S3 Delete
+    del_list = File.objects.filter(owner_group_id=group_id).values_list('id', flat=True)
+    s3_delete(del_list)
+
+    # Delete
+    del_list.update(is_trashed=1, deleted_at=timezone.now())
+    GroupUser.objects.filter(group_id=group_id).delete()
+    Group.objects.filter(id=group_id).delete()
+
     return {'result': True}
 
 
 # 그룹 사용자 삭제
 def remove_user(request, group_id, user_id):
+    # TODO: Auth
+    request.user_id = 1
+
+    # Query
+    group = Group.objects.filter(id=group_id)
+
+    # Check Owner
+    if group[0].owner_id != request.user_id:
+        return {'result': False, 'error': '권한이 없습니다.'}
+
+    # Check Me
+    if int(user_id) == request.user_id:
+        return {'result': False, 'error': '본인은 삭제할 수 없습니다.'}
+
+    # Remove
+    GroupUser.objects.filter(group_id=group_id, user_id=user_id).delete()
+
     return {'result': True}