diff --git a/README.md b/README.md index 331da1e..1968190 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,5 @@ # README # A bunch of my presentions, in [Reveal.js](http://lab.hakim.se/reveal-js/) format, most (if not all) in Portuguese. + +The canonical place for these presentations is [in my website](http://juliobiason.net/presentations/). diff --git a/_external/highlight-default.min.css b/_external/highlight-default.min.css new file mode 100644 index 0000000..f2429be --- /dev/null +++ b/_external/highlight-default.min.css @@ -0,0 +1 @@ +.hljs{display:block;padding:.5em;background:#f0f0f0}.hljs,.hljs-subst,.hljs-tag .hljs-title,.lisp .hljs-title,.clojure .hljs-built_in,.nginx .hljs-title{color:black}.hljs-string,.hljs-title,.hljs-constant,.hljs-parent,.hljs-tag .hljs-value,.hljs-rules .hljs-value,.hljs-rules .hljs-value .hljs-number,.hljs-preprocessor,.hljs-pragma,.haml .hljs-symbol,.ruby .hljs-symbol,.ruby .hljs-symbol .hljs-string,.hljs-aggregate,.hljs-template_tag,.django 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0000000..bca9ae5 Binary files /dev/null and b/_images/tumblr_n6qbpoBDVX1rbyj0do1_500.jpg differ diff --git a/ajax-sosp-cors-csrf.html b/ajax-sosp-cors-csrf.html new file mode 100644 index 0000000..cd8d2b4 --- /dev/null +++ b/ajax-sosp-cors-csrf.html @@ -0,0 +1,374 @@ + + + + + + + AJAX/SOSP/CORS/CSRF + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+
+

AJAX / SOSP / CORS / CSRF

+ +

+ (Ou 4 siglas, 16 letras e uma dor de cabeça) +

+
+ +
+

Agenda

+ +

Mostrar como aplicações web ricas se comportam quando + o conteúdo está vindo de uma fonte que não a fonte original.

+
+ +
+

A Idéia

+ +

Gerar uma view com conteúdo que será inserido em outro site; + o conteúdo deverá abrir um modal para pedir mais dados para o + usuário.

+
+ +
+

Passo 1: O Conteúdo

+ +

Carregado por AJAX, com jQuery. Fácil.

+ + 


+$(function() {
+    $("#div-especial").load("http://outrosite.com/conteudo.html");
+});
+

+
+ +
+
+

Problema 1: SOSP (Same Origin Security Policy)

+
+ +
+

Same Origin Security Policy é assegurado pelo browser, barrando + requisições vindas de lugares que não são o lugar original.

+ +

"Lugar original" = URL requisitada + tem mesmo esquema (http vs https), mesmo domínio + (subdomínios não contam), mesma porta (ou implício + 80) da URL que está fazendo a requisição.

+
+ +
+

Página em http://outrosite.com/conteudo.html pede:

+ +
    +
  • http://outrosite.com/dados.json ⇒ OK
    • +
  • http://outrosite.com/dir/dados.json ⇒ OK
    • +
  • http://usuário:senha@outrosite.com/dir/dados.json ⇒ OK
    • +
  • http://outrosite.com:8080/dados.json ⇒ NOT!
    • +
  • https://outrosite.com/dados.json ⇒ NOT!
    • +
  • http://api.outrosite.com/dados.json ⇒ NOT!
    • +
  • http://outrosite.com:80/dados.json ⇒ talvez...
    • +
+
+ +
+

Apenas lembrando: isso é forçado pelo + browser, não pelo serviço.

+ +

Outras aplicações podem passar por cima do Same + Origin se quiserem.

+
+ +
+

Restrições de subdomínios podem ser relaxadas se + scripts forem carregados de subdomínios + diferentes:

+ +

Se a página em http://outrosite.com/ + carregar um script de + http://api.outrosite.com, a restrição de + subdomínios pode ser removida para funções do + script.

+
+ +
+

Se não tiver como relaxar as restrições, utiliza-se + CORS.

+
+
+ +
+
+

Problema 2: CORS (Cross-Origin Resource Sharing)

+
+ +
+

CORS é implementado no servidor e diz se o serviço + pode ou não utilizar aquele recurso.

+
+ +
+

Browser rodando em http://outrosite.com + requisita serviço em + http://api.outrosite.com/.

+ +

Para isso, envia o header Origin.

+ + 


+Origin: http://outrosite.com
+

+
+ +
+

Servidor olha o header, verifica se a URL tem permissão + para acessar os recursos, é retornado o header + Access-Control-Allow-Origin.

+ + 


+Access-Control-Allow-Origin: http://outrosite.com
+

+
+ +
+

De novo, isso é controlado pelo browser; um + browser que não siga corretamente o controle de acesso ou um + aplicativo qualquer poderiam passar por cima dessa restrição + e continuar lendo o conteúdo.

+
+ +
+

Django-CORS-Headers

+ +

App para configurar CORS sozinho.

+ + 


+CORS_ORIGIN_WHITELIST = (
+   'outrosite.com',
+)
+

+ +

ou

+ + 


+CORS_ORIGIN_REGEX_WHITELIST = (
+    '^(https?://)?(\w+\.)?outrosite\.com$', 
+)
+

+
+ +
+

Agora o site externo consegue carregar o conteúdo das + views.

+
+
+ +
+
+

Problema 2.5: URLs reversas

+
+ +
+

Para resolver URLs, usamos a tag {% url vew_id %} + para retornar a URL da view.

+ +

O problema é que é retornada a URL absoluta para a view, + sem considerar o domínio da view.

+
+ +
+ 


+<a href='/view/'>
+

+ +

em http://outrosite.com vira + http://outrosite.com/view/.

+ +

Mas se a view estiver num domínio diferente, o mesmo + não é considerado.

+
+ +
+
    +
  • Se http://outrosite.com carregar o conteúdo + de http://api.outrosite.com
    • +
  • ... e http://api.outrosite.com tiver uma view + com URL absoluta /view/
    • +
  • ... o browser irá resolver como + http://outrosite.com/view/
    • +
  • ... quando deveria ser + http://api.outrosite.com/view/.
    • +
+
+ +
+

Solução: considerar que SITE_URL (do + settings.py) está correto e usar nas URLs.

+ + 


+<a href='{{ settings.SITE_URL }}{% url "view_id" %}'>
+

+
+
+ +
+
+

Problema 3: CSRF

+
+ +
+

Resumo:

+ +
    +
  • "csrftoken" é gerado na sessão do usuário.
    • +
  • Campo "csrftoken" é adicionado no form.
    • +
  • Quando o form retorna no POST, é verificado se é o + mesmo indicado na sessão do usuário.
    • +
+
+ +
+

Problema: Informações do token é passada num cookie.

+ + 


+Set-Cookie: "csrftoken=t5HBi8EbkPk340nnpkdb8qxQsy2n8LwY;
+            expires=Tue, 04-Aug-2015 16:40:38 GMT; Max-Age=31449600; Path=/"
+

+ +

Cookies não são processados durante requisições AJAX.

+
+ +
+

Solução correta:

+ +

Ao receber uma requisição AJAX, processar os headers também, + verificar a existência de "Set-Cookie", verificar se "csrftoken" + está na lista, guardar o valor e usar nas requisições seguintes.

+
+ +
+

Solução utilizada:

+ + 


+from django.views.decorators.csrf import csrf_exempt
+
+@csrf_exempt
+def minha_view(request):
+    ....
+

+
+
+ +
+
+

Problema 3.5: CSRF em Class Based Views

+
+ +
+ 


+class MinhaView(View):
+    @csrf_exempt
+    def post(self, request):
+        ....
+

+ +

... não funciona.

+
+ +
+

É preciso aplicar decorators no dispatch da view:

+ + 


+    @csrf_exempt
+    def dispatch(self, *args, **kwargs):
+        u"""Altera o dispatch para dispensar CSRF (por cauxa do AJAX)."""
+        return super(MinhaView, self).dispatch(*args, **kwargs)
+

+
+
+ +
+

+
+ +
+ Dica: Evite ter objetos cortantes próximos quando estiver lidando + com AJAX/SOSP/CORS/CSRF. +
+
+
+ + + + + + + + diff --git a/gitsvn.html b/gitsvn.html index ca48d54..a70b808 100644 --- a/gitsvn.html +++ b/gitsvn.html @@ -150,7 +150,12 @@ Stage this hunk [y,n,q,a,d,/,e,?]?

git log

    -
  • Igual ao svn log, mas não precisa de less (e nada de "broken pipe" ao fechar o log).
    • +
  • Igual ao svn log, mas não precisa de less e faz stream do conteúdo. +
      +
    • Isso significa que não é preciso esperar o log inteiro + ser gerado para o less apresentar e não ocorrem + mais "broken pipes" ao fechar o less.
      • +
  • Cores!
  • git log --raw: mostra os arquivos alterados dentro da revisão.
  • git log -p: mostra as alterações dentro da revisão.
    • diff --git a/gtg-hamster.html b/gtg-hamster.html new file mode 100644 index 0000000..72fec6c --- /dev/null +++ b/gtg-hamster.html @@ -0,0 +1,143 @@ + + + + + + + Timetracking com Get Things GNOME + Hamster + + + + + + + + + + + + + + + + + + + + + + + + +
    + +
    +
    +

    Timetracking com Get Things GNOME + Project Hamster

    +
    + +
    +

    O que é o que?

    +
    + +
    +

    Get Things GNOME

    + + + +

    Controle de coisas pra fazer (TODO).

    +
    + +
    +

    Get Things GNOME

    + + + +

    Plugin para ativar a opção de "Star Task on Hamster".

    +
    + +
    +

    Project Hamster

    + + + +

    Controle de tempo de tarefas (qualquer tarefa).

    +
    + +
    +

    Project Hamster

    + + + +

    Tempo total dispendido por tarefa.

    +
    + +
    +

    Bônus para usuários GNOME 3:

    + + + +

    Extension para GNOME 3 em + Extensions.GNOME.ORG.

    +
    + +
    +
    +
    +
    +
    + + + + + + + + diff --git a/index.html b/index.html index 97bf7bc..01ea9e7 100644 --- a/index.html +++ b/index.html @@ -69,6 +69,21 @@ ul.inline-list li {
    Flask + +
  • +
    + GTG + Hamster +
    • + +
  • +
    + AJAX/SOSP/CORS/CSRF +
    • + +
  • +
    + Pylint, Warnings e Correções +
diff --git a/pylint.html b/pylint.html new file mode 100644 index 0000000..7cd5854 --- /dev/null +++ b/pylint.html @@ -0,0 +1,407 @@ + + + + + + Pylint, Warnings e Correções + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+
+

Pylint, Warnings e Correções

+
+ +
+
+

missing-docstring

+
+ +
+

O que é o erro

+
+ 


+def funcao(valor):
+    return valor * 2
+

+
+
+ +
+

Solução

+ +

Documente suas funções!

+
+
+ +
+
+

wildcard-import

+
+ +
+

O que é o erro

+
+ 


+from module import *
+

+
+
+ +
+

Solução

+ +

Importe apenas as funções módulos que são usados.

+
+ +
+

Por que não usar "import *"

+ +
    +
  • O módulo pode ter código não protegido por + função, classe ou if __name__ == '__main__'
    • +
  • Poluíção do namespace.
    • +
  • Módulo pode redefinir uma função presente no + módulo atual.
    • +
+
+
+ +
+
+

unused-import

+
+ +
+

O que é o erro

+ +
+ 


+from module import function
+

+
+ +

(E function() não é usado em lugar algum.)

+
+ +
+

Solução

+ +

Remova o import.

+
+ +
+

Dica!

+ +

Quebrar imports em várias linhas facilita correção desse + tipo de problema.

+ +
+ 


+from module import func1
+from module import func2
+

+
+
+
+ +
+
+

unused-argument

+
+ +
+

O que é o erro

+ +
+ 


+def func(arg1, arg2):
+    return arg1 * 2
+

+
+
+ +
+

Solução

+ +
    +
  • Remova o parâmetro desnecessário
    • +
  • Altere o parâmetro para "_"
    • +
+
+ +
+

Corner case

+ +
+ 


+def addSeven(foo): # "Unused argument 'foo'"
+    foo += [7]
+

+
+ +

O problema é a questão de referência para objetos + mutáveis. O código em si está errado.

+
+
+ +
+
+

bare-except

+
+ +
+

O que é o erro

+ +
+ 


+try:
+   func()
+except Exception e:
+   pass
+

+
+
+ +
+

Solução

+ +

Capture apenas as exceções que você sabe lidar.

+
+
+ +
+
+

no-self-use

+
+ +
+

O que é o erro

+ +
+ 


+class A(object):
+    def func(self, a):
+        return a * 2
+

+
+
+ +
+

Solução

+ +

A solução mais "correta" é tirar a função da classe e deixar + fora do objeto.

+ +

Não sendo possível, + # pylint:disable=no-self-use antes da função. +

+
+
+ +
+
+

old-style-class

+
+
+ +
+
+

super-on-old-class

+
+
+ +
+
+

no-init

+
+
+ +
+
+

super-init-not-called

+
+
+ +
+
+

attribute-defined-outside-init

+
+
+ +
+
+

abstract-method

+
+
+ +
+
+

arguments-differ

+
+
+ +
+
+

no-member e maybe-no-member

+
+
+ +
+
+

no-value-for-parameter

+
+
+ +
+
+

protected-access

+
+
+ +
+
+

too-few-public-methods

+
+
+ +
+
+

too-many-ancestors

+
+
+ +
+
+

too-many-arguments

+
+
+ +
+
+

too-many-branches

+
+
+ +
+
+

too-many-instance-attributes

+
+
+ +
+
+

too-many-lines

+
+
+ +
+
+

too-many-locals

+
+
+ +
+
+

too-many-public-methods

+
+
+ +
+
+

too-many-statements

+
+
+ +
+
+

invalid-name

+
+
+ +
+
+

star-args

+
+
+
+
+ + + + + + + + + + - + +