python – flask-admin is_accessible用法

我已经检查了文档,并且如何实现is_accessible方法非常模糊.

以下是烧瓶管理员的文档显示的内容

class MicroBlogModelView(sqla.ModelView):

    def is_accessible(self):
        return login.current_user.is_authenticated()

    def inaccessible_callback(self, name, **kwargs):
        # redirect to login page if user doesn't have access
        return redirect(url_for('login', next=request.url))

我不知道的是你怎么称呼它是自动调用还是你必须像这样自己调用它：

@expose("/", methods=["GET", "POST"])
    def home(self):
        if self.is_accesible():
            return super().index()
        else:
            return self.login()

    def is_accesible(self):
        return current_user.is_authenticated and "admin" in current_user.role

因为放一个是非常重复的

if self.is_accesible():
                return super().index()

检查我们是否有很多管理员观点.
那么我们究竟是如何实现它的呢？文档展示了如何将它放在您的模型中,而不是如何在您的视图上实现它

解决方法:

请参阅下面的示例代码 – 大部分代码都是从Quokka CMS开始逐字记录的

定义一个处理def is_accessible(self)和def _handle_view(self,name,* args,** kwargs)的Roled mixin.

在示例中,我使用了一个函数def is_accessible(roles_accepted = None,user = None)来处理确定角色是否可接受的逻辑.

从sqla ModelView和Roled mixin定义一个视图类,即：

class AdminView(Roled, ModelView):

    def __init__(self, *args, **kwargs):
        self.roles_accepted = kwargs.pop('roles_accepted', list())
        super(AdminView, self).__init__(*args, **kwargs)

从此类派生您的视图模型：

class UserView(AdminView):
    form_excluded_columns = ('password')   

class RoleView(AdminView):
    pass

class PostView(AdminView):
    pass

以正常方式将您的视图添加到管理类,但通过roles_accepted关键字传递允许的角色名称列表：

admin.add_view(UserView(model=User, session=db.session, category='Account', name='Users', roles_accepted=['admin']))
admin.add_view(RoleView(model=Role, session=db.session, category='Account', name='Roles', roles_accepted=['admin']))
admin.add_view(PostView(model=Post, session=db.session, category='Blog', name='Posts (Editor Only)', roles_accepted=['editor']))
admin.add_view(PostView(model=Post, session=db.session, category='Blog', name='Posts (Admins & Editors)', endpoint="post_special", roles_accepted=['editor', 'admin']))

请参阅下面的完整单个文件代码这是在Python 2.7.9,Flask 0.10.1,flask-admin 1.1.0,flask-security 1.7.4和flask-login 0.2.11下测试的.

from datetime import datetime
from flask import Flask, redirect, current_app
from flask.ext.admin import Admin
from flask.ext.admin.contrib.sqla import ModelView
from flask.ext.admin.menu import MenuLink
from flask.ext.security import (
    current_user,
    url_for_security,
    UserMixin,
    RoleMixin,
    SQLAlchemyUserDatastore,
    Security
)
from flask.ext.security.utils import encrypt_password
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['DEBUG'] = True
app.config['SECRET_KEY'] = 'super-secret'
app.config['SECURITY_PASSWORD_HASH'] = 'pbkdf2_sha512'
app.config['SECURITY_PASSWORD_SALT'] = '16a0af319890f662055ba10aecff37e7e033db3fba737e55'
app.config['SECURITY_USER_IDENTITY_ATTRIBUTES'] = 'email'

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///:memory:'
app.config['SQLALCHEMY_ECHO'] = True
db = SQLAlchemy(app)


class Role(db.Model, RoleMixin):
    __tablename__ = 'roles'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.Unicode(length=64), unique=True)
    description = db.Column(db.Unicode(length=255), nullable=True)

    def __unicode__(self):
        return u"{name} ({role})".format(name=self.name, role=self.description or 'Role')

user_to_role = db.Table('user_to_role',
    db.Column('user_id', db.Integer(), db.ForeignKey('users.id')),
    db.Column('role_id', db.Integer(), db.ForeignKey('roles.id')))


class User(db.Model, UserMixin):
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)

    first_name = db.Column(db.Unicode(length=255), nullable=False)
    last_name = db.Column(db.Unicode(length=255), nullable=False)

    email = db.Column(db.Unicode(length=254), unique=True, nullable=True)
    password = db.Column(db.Unicode(length=255), nullable=False)
    active = db.Column(db.Boolean(), default=False)

    roles = db.relationship('Role', secondary=user_to_role, backref=db.backref('users', lazy='select'))

    def __unicode__(self):
        return u"{first_name} ({last_name})".format(first_name=self.first_name, last_name=self.last_name)


class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(255))
    content = db.Column(db.Text, nullable=False)

    def __unicode__(self):
        return self.title


def get_current_user():
    from flask.ext.security import current_user
    try:
        return User.objects.get(id=current_user.id)
    except Exception as e:
        # logger.warning("No user found: %s", str(e))
        return current_user


def is_accessible(roles_accepted=None, user=None):
    user = user or get_current_user()
    # uncomment if "admin" has access to everything
    # if user.has_role('admin'):
    #     return True
    if roles_accepted:
        accessible = any(
            [user.has_role(role) for role in roles_accepted]
        )
        return accessible
    return True


class Roled(object):

    def is_accessible(self):
        roles_accepted = getattr(self, 'roles_accepted', None)
        return is_accessible(roles_accepted=roles_accepted, user=current_user)

    def _handle_view(self, name, *args, **kwargs):
        if not current_user.is_authenticated():
            return redirect(url_for_security('login', next="/admin"))
        if not self.is_accessible():
            # return self.render("admin/denied.html")
            return "<p>Access denied</p>"

class AdminView(Roled, ModelView):

    def __init__(self, *args, **kwargs):
        self.roles_accepted = kwargs.pop('roles_accepted', list())
        super(AdminView, self).__init__(*args, **kwargs)


class UserView(AdminView):
    form_excluded_columns = ('password')


class RoleView(AdminView):
    pass


class PostView(AdminView):
    pass


# Setup Flask-Security
security = Security(app, SQLAlchemyUserDatastore(db, User, Role))

@app.route('/')
def index():
    _login = url_for_security('login', next="/admin")
    _logout = url_for_security('logout', next="/admin")
    return '''
        <a href="/admin/">Click me to get to Admin!</a><br>
        <a href="{login}">Click me to get to login!</a><br>
        <a href="{logout}">Click me to get to logout!</a>
        '''.format(login=_login, logout=_logout)


# Create admin
admin = Admin(app, name='Admin')
admin.add_view(UserView(model=User, session=db.session, category='Account', name='Users', roles_accepted=['admin']))
admin.add_view(RoleView(model=Role, session=db.session, category='Account', name='Roles', roles_accepted=['admin']))
admin.add_view(PostView(model=Post, session=db.session, category='Blog', name='Posts (Editor Only)', roles_accepted=['editor']))
admin.add_view(PostView(model=Post, session=db.session, category='Blog', name='Posts (Admins & Editors)', endpoint="post_special", roles_accepted=['editor', 'admin']))
admin.add_link(MenuLink(name='Public Website', category='', url='/'))


def build_db():
    users = [
        {
            'first_name': 'Super',
            'last_name': 'User',
            'email': 'admin@example.com',
            'active': True,
            'password' : encrypt_password('password'),
            'roles': ['admin']
        },
        {
            'first_name': u'Post',
            'last_name': u'Editor',
            'email': 'editor@example.com',
            'active': True,
            'password': encrypt_password('password'),
            'roles': ['editor']
        },

    ]

    posts = [
        {
            'title': "de Finibus Bonorum et Malorum - Part I",
            'content': "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut"
        },
        {
            'title': "de Finibus Bonorum et Malorum - Part II",
            'content': "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque"
        },
        {
            'title': "de Finibus Bonorum et Malorum - Part III",
            'content': "At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium"
        }
    ]

    db.drop_all()
    db.create_all()

    security = current_app.extensions.get('security')

    security.datastore.create_role(name=u"admin", description=u'Administers the system')
    security.datastore.create_role(name=u"editor", description=u'Can edit posts')

    for user in users:
        roles = user.pop('roles')
        user_db = security.datastore.create_user(**user)
        for role_name in roles:
            role_from_db = security.datastore.find_role(role_name)
            security.datastore.add_role_to_user(user_db, role_from_db)
        security.datastore.activate_user(user_db)
        user_db.confirmed_at = datetime.now()

    security.datastore.commit()

    for row in posts:
        post = Post(**row)
        db.session.add(post)

    db.session.commit()


@app.before_first_request
def create_user():
    build_db()

if __name__ == '__main__':
    app.run(debug=True)

标签：python,flask,flask-admin
来源： https://codeday.me/bug/20190727/1557003.html