quay/endpoints/api/user.py

""" Manage the current user. """

import logging
import json
import recaptcha2

from flask import request, abort
from flask_login import logout_user
from flask_principal import identity_changed, AnonymousIdentity
from peewee import IntegrityError

import features

from app import (app, billing as stripe, authentication, avatar, user_analytics, all_queues,
                 oauth_login)

from auth import scopes
from auth.auth_context import get_authenticated_user
from auth.permissions import (AdministerOrganizationPermission, CreateRepositoryPermission,
                              UserAdminPermission, UserReadPermission, SuperUserPermission)
from data import model
from data.billing import get_plan
from data.database import Repository as RepositoryTable, UserPromptTypes
from endpoints.api import (ApiResource, nickname, resource, validate_json_request, request_error,
                           log_action, internal_only, require_user_admin, parse_args,
                           query_param, require_scope, format_date, show_if,
                           require_fresh_login, path_param, define_json_response,
                           RepositoryParamResource, page_support)
from endpoints.exception import NotFound, InvalidToken, InvalidRequest, DownstreamIssue
from endpoints.api.subscribe import subscribe
from endpoints.common import common_login
from endpoints.csrf import generate_csrf_token, OAUTH_CSRF_TOKEN_NAME
from endpoints.decorators import anon_allowed
from oauth.oidc import DiscoveryFailureException
from util.useremails import (send_confirmation_email, send_recovery_email, send_change_email,
                             send_password_changed, send_org_recovery_email)
from util.names import parse_single_urn


REPOS_PER_PAGE = 100


logger = logging.getLogger(__name__)


def handle_invite_code(invite_code, user):
  """ Checks that the given invite code matches the specified user's e-mail address. If so, the
      user is marked as having a verified e-mail address and this method returns True.
  """
  parsed_invite = parse_single_urn(invite_code)
  if parsed_invite is None:
    return False

  if parsed_invite[0] != 'teaminvite':
    return False

  # Check to see if the team invite is valid. If so, then we know the user has
  # a possible matching email address.
  try:
    found = model.team.find_matching_team_invite(invite_code, user)
  except model.DataModelException:
    return False

  # Since we sent the invite code via email, mark the user as having a verified
  # email address.
  if found.email != user.email:
    return False

  user.verified = True
  user.save()
  return True


def user_view(user, previous_username=None):
  def org_view(o, user_admin=True):
    admin_org = AdministerOrganizationPermission(o.username)
    org_response = {
      'name': o.username,
      'avatar': avatar.get_data_for_org(o),
      'can_create_repo': CreateRepositoryPermission(o.username).can(),
    }

    if user_admin:
      org_response.update({
        'is_org_admin': admin_org.can(),
        'preferred_namespace': not (o.stripe_id is None),
      })

    return org_response

  organizations = model.organization.get_user_organizations(user.username)

  def login_view(login):
    try:
      metadata = json.loads(login.metadata_json)
    except:
      metadata = {}

    return {
      'service': login.service.name,
      'service_identifier': login.service_ident,
      'metadata': metadata
    }

  logins = model.user.list_federated_logins(user)

  user_response = {
    'anonymous': False,
    'username': user.username,
    'avatar': avatar.get_data_for_user(user),
  }

  user_admin = UserAdminPermission(previous_username if previous_username else user.username)
  if user_admin.can():
    user_response.update({
      'can_create_repo': True,
      'is_me': True,
      'verified': user.verified,
      'email': user.email,
      'logins': [login_view(login) for login in logins],
      'invoice_email': user.invoice_email,
      'invoice_email_address': user.invoice_email_address,
      'preferred_namespace': not (user.stripe_id is None),
      'tag_expiration': user.removed_tag_expiration_s,
      'prompts': model.user.get_user_prompts(user),
    })

    analytics_metadata = user_analytics.get_user_analytics_metadata(user)

    # This is a sync call, but goes through the async wrapper interface and
    # returns a Future. By calling with timeout 0 immediately after the method
    # call, we ensure that if it ever accidentally becomes async it will raise
    # a TimeoutError.
    user_response.update(analytics_metadata.result(timeout=0))

  user_view_perm = UserReadPermission(user.username)
  if user_view_perm.can():
    user_response.update({
      'organizations': [org_view(o, user_admin=user_admin.can()) for o in organizations],
    })


  if features.SUPER_USERS and SuperUserPermission().can():
    user_response.update({
      'super_user': user and user == get_authenticated_user() and SuperUserPermission().can()
    })

  return user_response


def notification_view(note):
  return {
    'id': note.uuid,
    'organization': note.target.username if note.target.organization else None,
    'kind': note.kind.name,
    'created': format_date(note.created),
    'metadata': json.loads(note.metadata_json),
    'dismissed': note.dismissed
  }


@resource('/v1/user/')
class User(ApiResource):
  """ Operations related to users. """
  schemas = {
    'NewUser': {
      'type': 'object',
      'description': 'Fields which must be specified for a new user.',
      'required': [
        'username',
        'password',
      ],
      'properties': {
        'username': {
          'type': 'string',
          'description': 'The user\'s username',
        },
        'password': {
          'type': 'string',
          'description': 'The user\'s password',
        },
        'email': {
          'type': 'string',
          'description': 'The user\'s email address',
        },
        'invite_code': {
          'type': 'string',
          'description': 'The optional invite code',
        },
        'recaptcha_response': {
          'type': 'string',
          'description': 'The (may be disabled) recaptcha response code for verification',
        },
      }
    },
    'UpdateUser': {
      'type': 'object',
      'description': 'Fields which can be updated in a user.',
      'properties': {
        'password': {
          'type': 'string',
          'description': 'The user\'s password',
        },
        'invoice_email': {
          'type': 'boolean',
          'description': 'Whether the user desires to receive an invoice email.',
        },
        'email': {
          'type': 'string',
          'description': 'The user\'s email address',
        },
        'tag_expiration': {
          'type': 'integer',
          'maximum': 2592000,
          'minimum': 0,
        },
        'username': {
          'type': 'string',
          'description': 'The user\'s username',
        },
        'invoice_email_address': {
          'type': ['string', 'null'],
          'description': 'Custom email address for receiving invoices',
        },
        'given_name': {
          'type': 'string',
          'description': 'The optional entered given name for the user',
        },
        'family_name': {
          'type': 'string',
          'description': 'The optional entered family name for the user',
        },
        'company': {
          'type': 'string',
          'description': 'The optional entered company for the user',
        },
      },
    },
    'UserView': {
      'type': 'object',
      'description': 'Describes a user',
      'required': ['anonymous', 'avatar'],
      'properties': {
        'verified': {
          'type': 'boolean',
          'description': 'Whether the user\'s email address has been verified'
        },
        'anonymous': {
          'type': 'boolean',
          'description': 'true if this user data represents a guest user'
        },
        'email': {
          'type': 'string',
          'description': 'The user\'s email address',
        },
        'avatar': {
          'type': 'object',
          'description': 'Avatar data representing the user\'s icon'
        },
        'organizations': {
          'type': 'array',
          'description': 'Information about the organizations in which the user is a member',
          'items': {
            'type': 'object'
          }
        },
        'logins': {
          'type': 'array',
          'description': 'The list of external login providers against which the user has authenticated',
          'items': {
            'type': 'object'
          }
        },
        'can_create_repo': {
          'type': 'boolean',
          'description': 'Whether the user has permission to create repositories'
        },
        'preferred_namespace': {
          'type': 'boolean',
          'description': 'If true, the user\'s namespace is the preferred namespace to display'
        }
      }
    },
  }

  @require_scope(scopes.READ_USER)
  @nickname('getLoggedInUser')
  @define_json_response('UserView')
  @anon_allowed
  def get(self):
    """ Get user information for the authenticated user. """
    user = get_authenticated_user()
    if user is None or user.organization or not UserReadPermission(user.username).can():
      raise InvalidToken("Requires authentication", payload={'session_required': False})

    return user_view(user)

  @require_user_admin
  @require_fresh_login
  @nickname('changeUserDetails')
  @internal_only
  @validate_json_request('UpdateUser')
  @define_json_response('UserView')
  def put(self):
    """ Update a users details such as password or email. """
    user = get_authenticated_user()
    user_data = request.get_json()
    previous_username = None

    try:
      if 'password' in user_data:
        logger.debug('Changing password for user: %s', user.username)
        log_action('account_change_password', user.username)

        # Change the user's password.
        model.user.change_password(user, user_data['password'])

        # Login again to reset their session cookie.
        common_login(user)

        if features.MAILING:
          send_password_changed(user.username, user.email)

      if 'invoice_email' in user_data:
        logger.debug('Changing invoice_email for user: %s', user.username)
        model.user.change_send_invoice_email(user, user_data['invoice_email'])

      if 'tag_expiration' in user_data:
        logger.debug('Changing user tag expiration to: %ss', user_data['tag_expiration'])
        model.user.change_user_tag_expiration(user, user_data['tag_expiration'])

      if ('invoice_email_address' in user_data and
           user_data['invoice_email_address'] != user.invoice_email_address):
        model.user.change_invoice_email_address(user, user_data['invoice_email_address'])

      if 'email' in user_data and user_data['email'] != user.email:
        new_email = user_data['email']
        if model.user.find_user_by_email(new_email):
          # Email already used.
          raise request_error(message='E-mail address already used')

        if features.MAILING:
          logger.debug('Sending email to change email address for user: %s',
                       user.username)
          code = model.user.create_confirm_email_code(user, new_email=new_email)
          send_change_email(user.username, user_data['email'], code.code)
        else:
          user_analytics.change_email(user.email, new_email)
          model.user.update_email(user, new_email, auto_verify=not features.MAILING)

      if 'given_name' in user_data or 'family_name' in user_data or 'company' in user_data:
        model.user.update_user_metadata(user, user_data.get('given_name'),
                                        user_data.get('family_name'), user_data.get('company'))
        user_analytics.change_metadata(user.email, user_data.get('given_name'),
                                       user_data.get('family_name'), user_data.get('company'))

      # Check for username rename. A username can be renamed if the feature is enabled OR the user
      # currently has a confirm_username prompt.
      if 'username' in user_data:
        confirm_username = model.user.has_user_prompt(user, 'confirm_username')
        new_username = user_data.get('username')
        previous_username = user.username

        rename_allowed = features.USER_RENAME or confirm_username
        username_changing = new_username and new_username != previous_username

        if rename_allowed and username_changing:
          if model.user.get_user_or_org(new_username) is not None:
            # Username already used.
            raise request_error(message='Username is already in use')

          user = model.user.change_username(user.id, new_username)
          user_analytics.change_username(user.email, new_username)
        elif confirm_username:
          model.user.remove_user_prompt(user, 'confirm_username')

    except model.user.InvalidPasswordException, ex:
      raise request_error(exception=ex)

    return user_view(user, previous_username=previous_username)

  @show_if(features.USER_CREATION)
  @show_if(features.DIRECT_LOGIN)
  @nickname('createNewUser')
  @internal_only
  @validate_json_request('NewUser')
  def post(self):
    """ Create a new user. """
    if app.config['AUTHENTICATION_TYPE'] != 'Database':
      abort(404)

    user_data = request.get_json()

    # If recaptcha is enabled, then verify the user is a human.
    if features.RECAPTCHA:
      recaptcha_response = user_data.get('recaptcha_response', '')
      result = recaptcha2.verify(app.config['RECAPTCHA_SECRET_KEY'],
                                 recaptcha_response,
                                 request.remote_addr)

      if not result['success']:
        return {
          'message': 'Are you a bot? If not, please revalidate the captcha.'
        }, 400

    invite_code = user_data.get('invite_code', '')
    existing_user = model.user.get_nonrobot_user(user_data['username'])
    if existing_user:
      raise request_error(message='The username already exists')

    if features.MAILING and not user_data.get('email'):
      raise request_error(message='Email address is required')

    try:
      prompts = model.user.get_default_user_prompts(features)
      new_user = model.user.create_user(user_data['username'], user_data['password'],
                                        user_data.get('email'),
                                        auto_verify=not features.MAILING,
                                        email_required=features.MAILING,
                                        prompts=prompts)

      email_address_confirmed = handle_invite_code(invite_code, new_user)
      if features.MAILING and not email_address_confirmed:
        code = model.user.create_confirm_email_code(new_user)
        send_confirmation_email(new_user.username, new_user.email, code.code)
        return {
          'awaiting_verification': True
        }
      else:
        common_login(new_user)
        return user_view(new_user)
    except model.user.DataModelException as ex:
      raise request_error(exception=ex)

  @require_user_admin
  @require_fresh_login
  @nickname('deleteCurrentUser')
  @internal_only
  def delete(self):
    """ Deletes the current user. """
    if app.config['AUTHENTICATION_TYPE'] != 'Database':
      abort(404)

    model.user.delete_user(get_authenticated_user(), all_queues)
    return '', 204


@resource('/v1/user/private')
@internal_only
@show_if(features.BILLING)
class PrivateRepositories(ApiResource):
  """ Operations dealing with the available count of private repositories. """
  @require_user_admin
  @nickname('getUserPrivateAllowed')
  def get(self):
    """ Get the number of private repos this user has, and whether they are allowed to create more.
    """
    user = get_authenticated_user()
    private_repos = model.user.get_private_repo_count(user.username)
    repos_allowed = 0

    if user.stripe_id:
      cus = stripe.Customer.retrieve(user.stripe_id)
      if cus.subscription:
        plan = get_plan(cus.subscription.plan.id)
        if plan:
          repos_allowed = plan['privateRepos']

    return {
      'privateCount': private_repos,
      'privateAllowed': (private_repos < repos_allowed)
    }


@resource('/v1/user/clientkey')
@internal_only
class ClientKey(ApiResource):
  """ Operations for returning an encrypted key which can be used in place of a password
      for the Docker client. """
  schemas = {
    'GenerateClientKey': {
      'type': 'object',
      'required': [
        'password',
      ],
      'properties': {
        'password': {
          'type': 'string',
          'description': 'The user\'s password',
        },
      }
    }
  }

  @require_user_admin
  @nickname('generateUserClientKey')
  @validate_json_request('GenerateClientKey')
  def post(self):
    """  Return's the user's private client key. """
    username = get_authenticated_user().username
    password = request.get_json()['password']
    (result, error_message) = authentication.confirm_existing_user(username, password)
    if not result:
      raise request_error(message=error_message)

    return {
      'key': authentication.encrypt_user_password(password)
    }


def conduct_signin(username_or_email, password, invite_code=None):
  needs_email_verification = False
  invalid_credentials = False

  (found_user, error_message) = authentication.verify_and_link_user(username_or_email, password)
  if found_user:
    # If there is an attached invitation code, handle it here. This will mark the
    # user as verified if the code is valid.
    if invite_code:
      handle_invite_code(invite_code, found_user)

    if common_login(found_user):
      return {'success': True}
    else:
      needs_email_verification = True

  else:
    invalid_credentials = True

  return {
    'needsEmailVerification': needs_email_verification,
    'invalidCredentials': invalid_credentials,
    'message': error_message
  }, 403


@resource('/v1/user/convert')
@internal_only
@show_if(app.config['AUTHENTICATION_TYPE'] == 'Database')
class ConvertToOrganization(ApiResource):
  """ Operations for converting a user to an organization. """
  schemas = {
    'ConvertUser': {
      'type': 'object',
      'description': 'Information required to convert a user to an organization.',
      'required': [
        'adminUser',
        'adminPassword'
      ],
      'properties': {
        'adminUser': {
          'type': 'string',
          'description': 'The user who will become an org admin\'s username',
        },
        'adminPassword': {
          'type': 'string',
          'description': 'The user who will become an org admin\'s password',
        },
        'plan': {
          'type': 'string',
          'description': 'The plan to which the organization should be subscribed',
        },
      },
    },
  }

  @require_user_admin
  @nickname('convertUserToOrganization')
  @validate_json_request('ConvertUser')
  def post(self):
    """ Convert the user to an organization. """
    user = get_authenticated_user()
    convert_data = request.get_json()

    # Ensure that the sign in credentials work.
    admin_username = convert_data['adminUser']
    admin_password = convert_data['adminPassword']
    (admin_user, _) = authentication.verify_and_link_user(admin_username, admin_password)
    if not admin_user:
      raise request_error(reason='invaliduser',
                          message='The admin user credentials are not valid')

    # Ensure that the new admin user is the not user being converted.
    if admin_user.id == user.id:
      raise request_error(reason='invaliduser', message='The admin user is not valid')

    # Subscribe the organization to the new plan.
    if features.BILLING:
      plan = convert_data.get('plan', 'free')
      subscribe(user, plan, None, True)  # Require business plans

    # Convert the user to an organization.
    model.organization.convert_user_to_organization(user, admin_user)
    log_action('account_convert', user.username)

    # And finally login with the admin credentials.
    return conduct_signin(admin_username, admin_password)


@resource('/v1/signin')
@show_if(features.DIRECT_LOGIN)
@internal_only
class Signin(ApiResource):
  """ Operations for signing in the user. """
  schemas = {
    'SigninUser': {
      'type': 'object',
      'description': 'Information required to sign in a user.',
      'required': [
        'username',
        'password',
      ],
      'properties': {
        'username': {
          'type': 'string',
          'description': 'The user\'s username',
        },
        'password': {
          'type': 'string',
          'description': 'The user\'s password',
        },
        'invite_code': {
          'type': 'string',
          'description': 'The optional invite code'
        },
      },
    },
  }

  @nickname('signinUser')
  @validate_json_request('SigninUser')
  @anon_allowed
  def post(self):
    """ Sign in the user with the specified credentials. """
    signin_data = request.get_json()
    if not signin_data:
      raise NotFound()

    username = signin_data['username']
    password = signin_data['password']
    invite_code = signin_data.get('invite_code', '')
    return conduct_signin(username, password, invite_code=invite_code)


@resource('/v1/signin/verify')
@internal_only
class VerifyUser(ApiResource):
  """ Operations for verifying the existing user. """
  schemas = {
    'VerifyUser': {
      'id': 'VerifyUser',
      'type': 'object',
      'description': 'Information required to verify the signed in user.',
      'required': [
        'password',
      ],
      'properties': {
        'password': {
          'type': 'string',
          'description': 'The user\'s password',
        },
      },
    },
  }

  @require_user_admin
  @nickname('verifyUser')
  @validate_json_request('VerifyUser')
  def post(self):
    """ Verifies the signed in the user with the specified credentials. """
    signin_data = request.get_json()
    password = signin_data['password']

    username = get_authenticated_user().username
    (result, error_message) = authentication.confirm_existing_user(username, password)
    if not result:
      return {
        'message': error_message,
        'invalidCredentials': True,
      }, 403

    common_login(result)
    return {'success': True}


@resource('/v1/signout')
@internal_only
class Signout(ApiResource):
  """ Resource for signing out users. """
  @nickname('logout')
  def post(self):
    """ Request that the current user be signed out. """
    logout_user()
    identity_changed.send(app, identity=AnonymousIdentity())
    return {'success': True}


@resource('/v1/externallogin/<service_id>')
@internal_only
class ExternalLoginInformation(ApiResource):
  """ Resource for both setting a token for external login and returning its authorization
      url.
  """
  schemas = {
    'GetLogin': {
      'type': 'object',
      'description': 'Information required to an retrieve external login URL.',
      'required': [
        'kind',
      ],
      'properties': {
        'kind': {
          'type': 'string',
          'description': 'The kind of URL',
          'enum': ['login', 'attach'],
        },
      },
    },
  }


  @nickname('retrieveExternalLoginAuthorizationUrl')
  @anon_allowed
  @validate_json_request('GetLogin')
  def post(self, service_id):
    """ Generates the auth URL and CSRF token explicitly for OIDC/OAuth-associated login. """
    login_service = oauth_login.get_service(service_id)
    if login_service is None:
      raise InvalidRequest()

    csrf_token = generate_csrf_token(OAUTH_CSRF_TOKEN_NAME)
    kind = request.get_json()['kind']
    redirect_suffix = '/attach' if kind == 'attach' else ''

    try:
      login_scopes = login_service.get_login_scopes()
      auth_url = login_service.get_auth_url(app.config, redirect_suffix, csrf_token, login_scopes)
      return {'auth_url': auth_url}
    except DiscoveryFailureException as dfe:
      logger.exception('Could not discovery OAuth endpoint information')
      raise DownstreamIssue(dfe.message)


@resource('/v1/detachexternal/<service_id>')
@show_if(features.DIRECT_LOGIN)
@internal_only
class DetachExternal(ApiResource):
  """ Resource for detaching an external login. """
  @require_user_admin
  @nickname('detachExternalLogin')
  def post(self, service_id):
    """ Request that the current user be detached from the external login service. """
    model.user.detach_external_login(get_authenticated_user(), service_id)
    return {'success': True}


@resource("/v1/recovery")
@show_if(features.MAILING)
@internal_only
class Recovery(ApiResource):
  """ Resource for requesting a password recovery email. """
  schemas = {
    'RequestRecovery': {
      'type': 'object',
      'description': 'Information required to sign in a user.',
      'required': [
        'email',
      ],
      'properties': {
        'email': {
          'type': 'string',
          'description': 'The user\'s email address',
        },
      },
    },
  }

  @nickname('requestRecoveryEmail')
  @anon_allowed
  @validate_json_request('RequestRecovery')
  def post(self):
    """ Request a password recovery email."""
    def redact(value):
      threshold = max((len(value) / 3) - 1, 1)
      v = ''
      for i in range(0, len(value)):
        if i < threshold or i >= len(value) - threshold:
          v = v + value[i]
        else:
          v = v + u'\u2022'

      return v

    email = request.get_json()['email']
    user = model.user.find_user_by_email(email)
    if not user:
      raise model.InvalidEmailAddressException('Email address was not found.')

    if user.organization:
      send_org_recovery_email(user, model.organization.get_admin_users(user))
      return {
        'status': 'org',
        'orgemail': email,
        'orgname': redact(user.username),
      }

    code = model.user.create_reset_password_email_code(email)
    send_recovery_email(email, code.code)
    return {
      'status': 'sent',
    }


@resource('/v1/user/notifications')
@internal_only
class UserNotificationList(ApiResource):
  @require_user_admin
  @parse_args()
  @query_param('page', 'Offset page number. (int)', type=int, default=0)
  @query_param('limit', 'Limit on the number of results (int)', type=int, default=5)
  @nickname('listUserNotifications')
  def get(self, parsed_args):
    page = parsed_args['page']
    limit = parsed_args['limit']

    notifications = list(model.notification.list_notifications(get_authenticated_user(), page=page,
                                                               limit=limit + 1))
    has_more = False

    if len(notifications) > limit:
      has_more = True
      notifications = notifications[0:limit]

    return {
      'notifications': [notification_view(note) for note in notifications],
      'additional': has_more
    }


@resource('/v1/user/notifications/<uuid>')
@path_param('uuid', 'The uuid of the user notification')
@internal_only
class UserNotification(ApiResource):
  schemas = {
    'UpdateNotification': {
      'type': 'object',
      'description': 'Information for updating a notification',
      'properties': {
        'dismissed': {
          'type': 'boolean',
          'description': 'Whether the notification is dismissed by the user',
        },
      },
    },
  }

  @require_user_admin
  @nickname('getUserNotification')
  def get(self, uuid):
    note = model.notification.lookup_notification(get_authenticated_user(), uuid)
    if not note:
      raise NotFound()

    return notification_view(note)

  @require_user_admin
  @nickname('updateUserNotification')
  @validate_json_request('UpdateNotification')
  def put(self, uuid):
    note = model.notification.lookup_notification(get_authenticated_user(), uuid)
    if not note:
      raise NotFound()

    note.dismissed = request.get_json().get('dismissed', False)
    note.save()

    return notification_view(note)


def authorization_view(access_token):
  oauth_app = access_token.application
  app_email = oauth_app.avatar_email or oauth_app.organization.email
  return {
    'application': {
      'name': oauth_app.name,
      'description': oauth_app.description,
      'url': oauth_app.application_uri,
      'avatar': avatar.get_data(oauth_app.name, app_email, 'app'),
      'organization': {
        'name': oauth_app.organization.username,
        'avatar': avatar.get_data_for_org(oauth_app.organization)
      }
    },
    'scopes': scopes.get_scope_information(access_token.scope),
    'uuid': access_token.uuid
  }

@resource('/v1/user/authorizations')
@internal_only
class UserAuthorizationList(ApiResource):
  @require_user_admin
  @nickname('listUserAuthorizations')
  def get(self):
    access_tokens = model.oauth.list_access_tokens_for_user(get_authenticated_user())

    return {
      'authorizations': [authorization_view(token) for token in access_tokens]
    }


@resource('/v1/user/authorizations/<access_token_uuid>')
@path_param('access_token_uuid', 'The uuid of the access token')
@internal_only
class UserAuthorization(ApiResource):
  @require_user_admin
  @nickname('getUserAuthorization')
  def get(self, access_token_uuid):
    access_token = model.oauth.lookup_access_token_for_user(get_authenticated_user(),
                                                            access_token_uuid)
    if not access_token:
      raise NotFound()

    return authorization_view(access_token)

  @require_user_admin
  @nickname('deleteUserAuthorization')
  def delete(self, access_token_uuid):
    access_token = model.oauth.lookup_access_token_for_user(get_authenticated_user(), access_token_uuid)
    if not access_token:
      raise NotFound()

    access_token.delete_instance(recursive=True, delete_nullable=True)
    return '', 204

@resource('/v1/user/starred')
class StarredRepositoryList(ApiResource):
  """ Operations for creating and listing starred repositories. """
  schemas = {
    'NewStarredRepository': {
      'type': 'object',
      'required': [
        'namespace',
        'repository',
      ],
      'properties': {
        'namespace': {
          'type': 'string',
          'description': 'Namespace in which the repository belongs',
        },
        'repository': {
          'type': 'string',
          'description': 'Repository name'
        }
      }
    }
  }

  @nickname('listStarredRepos')
  @parse_args()
  @require_user_admin
  @page_support()
  def get(self, page_token, parsed_args):
    """ List all starred repositories. """
    repo_query = model.repository.get_user_starred_repositories(get_authenticated_user())

    repos, next_page_token = model.modelutil.paginate(repo_query, RepositoryTable,
                                                      page_token=page_token, limit=REPOS_PER_PAGE)

    def repo_view(repo_obj):
      return {
        'namespace': repo_obj.namespace_user.username,
        'name': repo_obj.name,
        'description': repo_obj.description,
        'is_public': repo_obj.visibility.name == 'public',
      }

    return {'repositories': [repo_view(repo) for repo in repos]}, next_page_token

  @require_scope(scopes.READ_REPO)
  @nickname('createStar')
  @validate_json_request('NewStarredRepository')
  @require_user_admin
  def post(self):
    """ Star a repository. """
    user = get_authenticated_user()
    req = request.get_json()
    namespace = req['namespace']
    repository = req['repository']
    repo = model.repository.get_repository(namespace, repository)

    if repo:
      try:
        model.repository.star_repository(user, repo)
      except IntegrityError:
        pass

      return {
        'namespace': namespace,
        'repository': repository,
      }, 201


@resource('/v1/user/starred/<apirepopath:repository>')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
class StarredRepository(RepositoryParamResource):
  """ Operations for managing a specific starred repository. """
  @nickname('deleteStar')
  @require_user_admin
  def delete(self, namespace, repository):
    """ Removes a star from a repository. """
    user = get_authenticated_user()
    repo = model.repository.get_repository(namespace, repository)

    if repo:
      model.repository.unstar_repository(user, repo)
      return '', 204


@resource('/v1/users/<username>')
class Users(ApiResource):
  """ Operations related to retrieving information about other users. """
  @nickname('getUserInformation')
  def get(self, username):
    """ Get user information for the specified user. """
    user = model.user.get_nonrobot_user(username)
    if user is None:
      abort(404)

    return user_view(user)