What Is The Authorizer App On My Mac
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The System Information app provides detailed specifications and other information about your Mac hardware and software, including your network and external devices. In some versions of OS X, this app is called System Profiler.
Choose Apple menu > About This Mac. This opens an overview of your Mac, including your Mac model, processor, memory, serial number, and version of macOS. To see the greater detail provided by the System Information app, click the System Report button.
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System Information opens to a system report for your Mac:
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- To have System Information read your serial number aloud, choose File > Speak Serial Number.
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If you had noticed from the previous steps, there was a username
fieldfor all of the Todos, but the username
was always set to default
.This step will be utilizing the username
field by exposing the notionof users and authorization in the Todo application. For this section, we willbe doing the following to add authorization and users to the application:
For authorization, the application is going to be relying on JWT. To dependon JWT, in the Chalice application PyJWT
needs to be installed and addedto our requirements.txt
file.
Instructions¶
Add
PyJWT
to yourrequirements.txt
file:Make sure it is now installed in your virtualenv:
Verification¶
To ensure that it was installed, open the Python REPL and try to importthe PyJWT
library:
In order to add authentication to your Chalice application we have provided a fewfiles that help with some of the low-level details. We have added an auth.py
fileto chalicelib
which abstracts away some of the details of handling JWT tokens. Wehave also added a users.py
script which is a command line utility for creating andmanaging a user table.
Instructions¶
1) Copy in the chalice-workshop/code/todo-app/part1/04-add-auth/chalicelib/auth.py
file:
2) Copy over the chalice-workshop/code/todo-app/part1/04-add-auth/users.py
script forcreating users:
Verification¶
From within the mytodo
directory of your Todo Chalice application, thestructure should be the following:
Using the createtable.py
script, this will create another DynamoDB tablefor storing users to use in the Chalice application.
Instructions¶
Run the
createtable.py
script to create the DynamoDB table:
Verification¶
Check that the return code of the command is 0
:
Also cat
the .chalice/config.json
to make sure the USERS_TABLE_NAME
shows up as an environment variable:
Using the users.py
script, create a new user in your users database touse with your chalice application.
Instructions¶
Run the
users.py
script with the-c
argument to create a user. Youwill be prompted for a username and a password:
Verification¶
Using the users.py
script, make sure that the user is listed in yourdatabase:
Also make sure that the password is correct by testing the username andpassword with the users.py
script:
You can also test an incorrect password. You should see this output:
Now that we have created a DynamoDB user table, we will create a convenience functionfor loading it.
Instructions¶
Add a new variable
_USER_DB
in yourapp.py
file with a value of None:
Create a function for fetching our current database table for users. Similar to thefunction that gets the app table. Add this function to your
app.py
file:
We will now create a login route where users can trade their username/password for aJWT token.
Instructions¶
Define a new Chalice route
/login
that accepts the POST method and grabs theusername
andpassword
from the request, and forwards it along to a helperfunction in theauth
code you copied in earlier which will trade those for aJWT token.
Notice the above code snippit uses the
auth
file that we copied into ourchalicelib directory at the beginning of this step. Add the followingimport statement to the top ofapp.py
so we can use it:
Verification¶
Start up a local server using
chalicelocal
.Using the username and password generated previously, run
chalicelocal
and make an HTTPPOST
request to the/login
URI:
This should return a JWT to use as an Authorization
header for that user.
To add authorization to our app we will start by defining an authorizer andattaching it to one of our routes.
Instructions¶
Create an authorizer function that checks the validity of a JWT token using theexisting code in the
auth.py
file we copied earlier. If the token is valid(didn’t throw an error) we will return a policy that allows access to all of ourroutes, and sets theprincipal_id
to the username in the JWT token.Once we have defined the authorizer, we will attach it to the
get_todos
route.
Also make sure to import the AuthResponse
class at the top of the app.py
file:
Verification¶
Start the local dev server
chalicelocal
Try to get the todo, the request should be rejected without authorization:
Try the same call again but with your authorization token passed in the
Authorization
header:
What Is The Authorizer App On My Macbook Air
Now attach the authorizer to all the other routes except the login
route.
Instructions¶
Attach the
jwt_auth
authorizer to theadd_new_todo
route.Attach the
jwt_auth
authorizer to theget_todo
route.Attach the
jwt_auth
authorizer to thedelete_todo
route.Attach the
jwt_auth
authorizer to theupdate_todo
route.
Verification¶
Start up the local dev server
chalicelocal
Try each route without an authorization token. You should get a
401
Unauthorized response:
Now try to create, get, update, and delete a todo from your application byusing the
Authorization
header in all your requests:
Now that we have authorizers hooked up to all our routes we can use thatinstead of relying on the default user of default
.
Instructions¶
First create a function named
get_authorized_username
that will be usedto convert the information we have in ourcurrent_request
into ausername.
Now we need to update each function that interacts with our database tocalculate the
username
and pass it to thexxx_item
method.
Verification¶
What Is The Authorizer App On My Macbook Pro
Spin up the local Chalice server with
chalicelocal
.Create a new todo and pass in your auth token:
List your todos using the get_todos route:
Notice that now the username is no longer
default
it should be whatever usernamewent with the auth token you supplied.Try making a new user with
pythonusers.py-c
and then get their JWT tokenby calling the login route with their credentials.Call the same route as above as the new user by passing in their JWT token in the
Authorization
header. They should get no todos since they have not created anyyet:
Now that we have it working locally lets deploy it and verify that it still works.
Verification¶
Try the same two calls above against the real API Gateway endpoint you get from yourdeploy instead of the localhost endpoint. If you lose your endpoint you can run
chaliceurl
which will print out your API Gateway endpoint:
When you are finished your app.py
file should look like: