51enra

Udacity AI for Trading Notes

1. Concepts

Nassim Taleb's home page
Quantdare
Quantrocket (tutorials, zipline, data)
Zipline documentation (Stephan Jansen) & link to github
Zipline tutorial (Stephan Jansen)
Alphalens ("Alphalens is a Python Library for performance analysis of predictive (alpha) stock factors.")

Wiederholung High Level Flow (Beziehung ID Provider - Client - Resource Server) (Präsentation zeigen)
[Backend und Frontend gestartet] Login durchführen. In der Frontend Log-Datei (Filter auf ApiFactory und MainActivity) das Access Token, Expiration Time und die zurückgegebenen User-Daten zeigen.
Access Token Inhalt in https://jwt.io (zeigen) (die Expiry Time könnte man noch bei https://www.epochconverter.com/ dekodieren)
Backend: WebSecurityConfig zeigen --> hier ist die abgesicherte Route festgelegt; Resource Server Konfigurations-Details im JwtDecoder (keine weitere Erklärung). Authentication relevante Klassen im Package authentication (aufklappen).
Frontend: ApiFactory zeigen --> Zufügung des Authentication Headers über den Authenticator (keine weitere Erklärung)
Zum Einschalten des abgesicherten Zugriffs: im Frontend, UserProfileApi, im ersten @Get() secure/ einfügen:

public interface UserProfileApi {

Spring Boot Resource Server Configuration

The following description refers to the current implementation of a secure REST API for the Mayo project. It is NOT the simplest possible implementation of a Spring Boot Resource Server, which requires much less code. For a choice of simpler configuration options, please refer to the official Spring Security documentation, which is anyway an excellent starting point for deeper understanding. The main driver for the additional complexity here is the objective to cover authenticated access to the resources with authentication tokens provided by different entities.

pom.xml

Add the following dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
 spring-boot-starter-oauth2-resource-server

Android: REST API, Repository, ViewModel, LiveData

Changes are described starting from the status after the previous live coding (Android Restcall with Retrofit)

Package Structure below de.telekom.mayo.frontend.android.mayo:

api: the Retrofit interfaces and the Retrofit factory that also creates the implementations of the interfaces
model: the Java object representations (entitites) for the data structures offered via the REST API
repo: the repositories that provide all the CRUD methods for the REST API; one per entity
profile: user interface related classes around the user profile, e.g. activities, viewmodels, adapters

	Header response for non-existent page

	HTTP/1.1 404 Not Found
	Date: Thu, 05 Dec 2019 14:26:46 GMT
	Server: Apache
	Last-Modified: Thu, 05 Mar 2015 08:44:26 GMT
	ETag: "220-51086934dd7f3"
	Accept-Ranges: bytes
	Content-Length: 544
	Content-Type: text/html

	mysql> SELECT team.name team, COUNT(*) AS nb_players -> FROM player
	-> JOIN team ON player.team_id = team.id
	-> GROUP BY player.team_id
	-> ORDER BY nb_players DESC;
	+------------+------------+
	\| team \| nb_players \|
	+------------+------------+
	\| Gryffindor \| 36 \|
	\| Slytherin \| 21 \|
	\| Ravenclaw \| 15 \|

	mysql> SELECT lastname, firstname, player.role, team.name AS team
	-> FROM wizard
	-> JOIN player ON wizard_id = wizard.id
	-> JOIN team ON player.team_id = team.id
	-> ORDER BY team.name, player.role, lastname, firstname;
	+-----------------+-------------+--------+------------+
	\| lastname \| firstname \| role \| team \|
	+-----------------+-------------+--------+------------+
	\| Black \| Sirius \| beater \| Gryffindor \|
	\| Brown \| Lavender \| beater \| Gryffindor \|

	mysql> INSERT INTO school (name,country, capacity) VALUES
	-> ('Beauxbatons Academy of Magic', 'France', 550),
	-> ('Castelobruxo', 'Brazil', 380),
	-> ('Hogwarts School of Witchcraft and Wizardry', 'United Kingdom', 450),
	-> ('Ilvermorny School of Witchcraft and Wizardry', 'USA', 300),
	-> ('Koldovstoretz', 'Russia', 125),
	-> ('Mahoutokoro School of Magic', 'Japan', 800),
	-> ('Uagadou School of Magic', 'Uganda', 350),
	-> ('Durmstrang Institute', 'Norway', 570);

	SELECT * FROM wizard WHERE birthday BETWEEN '1975-01-01' AND '1985-12-31';

	+----+-----------+----------+------------+-------------+---------------------------------------+-----------+
	\| id \| firstname \| lastname \| birthday \| birth_place \| biography \| is_muggle \|
	+----+-----------+----------+------------+-------------+---------------------------------------+-----------+
	\| 1 \| harry \| potter \| 1980-07-31 \| london \| \| 0 \|
	\| 2 \| hermione \| granger \| 1979-09-19 \| \| Friend of Harry Potter \| 0 \|
	\| 4 \| ron \| weasley \| 1980-03-01 \| \| Best friend of Harry \| 0 \|
	\| 5 \| ginny \| weasley \| 1981-08-11 \| \| Sister of Ron and girlfriend of Harry \| 0 \|
	\| 6 \| fred \| weasley \| 1978-04-01 \| \| \| 0 \|

	' or 1=1 -- (wie vorgegeben) in username oder password
	' or true -- in username oder password
	bob' -- in username Zeile ("geraten :-)")