Arquivamento do projeto: Essa foi a ultima vez que atualizo esse site, já que não estudo mais em uma escola com o sistema de ensino Positivo. Agradeço por usar meus aplicativos e sites!
De uma maneira bem simples, o positivo on tem os dados do seu perfil de usuário, e nele tem qual turma você está. Essa informação é usada nas mensagens e tambem na salas virtuais.
Se você quer entender mais a fundo como o site funciona, continue lendo abaixo.
Começando pelo o inicio... é necessário enviar uma solicitação para https://portal-bff.positivoon.com.br/login com o usuário e senha, e com isso iremos obter todos os dados ncessários, incluindo o nome do aluno e as turmas cadrastadas. Com essa nova API fica muito mais fácil procurar a turma.
O problema do CORS continua o mesmo, então novamente criei uma proxy usando o código abaixo:
async function handleRequest(request) {
const url = new URL(request.url)
const apiurl = url.searchParams.get('apiurl')
// Rewrite request to point to API url. This also makes the request mutable
// so we can add the correct Origin header to make the API server think
// that this request isn't cross-site.
request = new Request(apiurl, request)
request.headers.set('Origin', new URL(apiurl).origin)
let response = await fetch(request)
// Recreate the response so we can modify the headers
response = new Response(response.body, response)
// Set CORS headers
response.headers.set('Access-Control-Allow-Origin', 'https://turma.princessmortix.link')
// Append to/Add Vary header so browser will cache response correctly
response.headers.append('Vary', 'Origin')
return response
}
function handleOptions(request) {
// Make sure the necesssary headers are present
// for this to be a valid pre-flight request
if (
request.headers.get('Origin') !== null &&
request.headers.get('Access-Control-Request-Method') !== null &&
request.headers.get('Access-Control-Request-Headers') !== null
) {
// Handle CORS pre-flight request.
// If you want to check the requested method + headers
// you can do that here.
return new Response(null, {
headers: corsHeaders,
})
} else {
// Handle standard OPTIONS request.
// If you want to allow other HTTP Methods, you can do that here.
return new Response(null, {
headers: {
Allow: 'GET, HEAD, POST, OPTIONS',
},
})
}
}
addEventListener('fetch', event => {
const request = event.request
const url = new URL(request.url)
if (url.pathname.startsWith(proxyEndpoint)) {
if (request.method === 'OPTIONS') {
// Handle CORS preflight requests
event.respondWith(handleOptions(request))
} else if (
request.method === 'GET' ||
request.method === 'HEAD' ||
request.method === 'POST'
) {
// Handle requests to the API server
event.respondWith(handleRequest(request))
} else {
event.respondWith(async () => {
return new Response(null, {
status: 405,
statusText: 'Method Not Allowed',
})
})
}
} else {
// Serve demo page
event.respondWith(rawHtmlResponse(demoPage))
}
})
// We support the GET, POST, HEAD, and OPTIONS methods from any origin,
// and accept the Content-Type header on requests. These headers must be
// present on all responses to all CORS requests. In practice, this means
// all responses to OPTIONS requests.
const corsHeaders = {
'Access-Control-Allow-Origin': 'https://turma.princessmortix.link',
'Access-Control-Allow-Methods': 'GET, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization',
}
// The URL for the remote third party API you want to fetch from
// but does not implement CORS
const apiurl = 'https://apihub.positivoon.com.br/api'
// The endpoint you want the CORS reverse proxy to be on
const proxyEndpoint = '/proxy/'
// The rest of this snippet for the demo page
async function rawHtmlResponse(html) {
return new Response(html, {
headers: {
'content-type': 'text/html;charset=UTF-8',
},
})
}
const demoPage = `
<!DOCTYPE html>
<html>
<body>
<h1>API GET without CORS Proxy</h1>
<a target='_blank' href='https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#Checking_that_the_fetch_was_successful'>Shows TypeError: Failed to fetch since CORS is misconfigured</a>
<p id='noproxy-status'/>
<code id='noproxy'>Waiting</code>
<h1>API GET with CORS Proxy</h1>
<p id='proxy-status'/>
<code id='proxy'>Waiting</code>
<h1>API POST with CORS Proxy + Preflight</h1>
<p id='proxypreflight-status'/>
<code id='proxypreflight'>Waiting</code>
<script>
let reqs = {};
reqs.noproxy = async () => {
let response = await fetch('${apiurl}')
return await response.json()
}
reqs.proxy = async () => {
let response = await fetch(window.location.origin + '${proxyEndpoint}?apiurl=${apiurl}')
return await response.json()
}
reqs.proxypreflight = async () => {
const reqBody = {
msg: "Hello world!"
}
let response = await fetch(window.location.origin + '${proxyEndpoint}?apiurl=${apiurl}', {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify(reqBody),
})
return await response.json()
}
(async () => {
for (const [reqName, req] of Object.entries(reqs)) {
try {
let data = await req()
document.getElementById(reqName).innerHTML = JSON.stringify(data)
} catch (e) {
document.getElementById(reqName).innerHTML = e
}
}
})()
</script>
</body>
</html>`O código foi adaptado de cors-proxy-worker, que está na licença MIT.