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import { IncomingHttpHeaders } from "http"
import { isText } from "istextorbinary"
import { NextApiRequest, NextApiResponse } from "next"
import parse, { splitCookiesString } from "set-cookie-parser"
import { CreateApiHandlerOptions } from "../type/create-api-handler-options"
import { getBaseUrl } from "../common/get-base-url"
import { defaultForwardedHeaders } from "../common/default-forwarded-headers"
import { processLocationHeader } from "../common/process-location-header"
import { guessCookieDomain } from "../common/get-cookie-domain"
function readRawBody(req: NextApiRequest): Promise<Buffer> {
return new Promise((resolve, reject) => {
const chunks: Uint8Array[] = []
req.on("data", (chunk) => chunks.push(chunk))
req.on("end", () => resolve(Buffer.concat(chunks)))
req.on("error", (err) => reject(err))
})
}
export function filterRequestHeaders(
headers: IncomingHttpHeaders,
forwardAdditionalHeaders?: string[],
): Headers {
const filteredHeaders = new Headers()
Object.entries(headers).forEach(([key, value]) => {
const isValid =
defaultForwardedHeaders.includes(key) ||
(forwardAdditionalHeaders ?? []).includes(key)
if (isValid)
filteredHeaders.set(key, Array.isArray(value) ? value.join(",") : value)
})
return filteredHeaders
}
/**
* The NextJS API configuration
*/
export const config = {
api: {
bodyParser: false,
},
}
function processSetCookieHeader(
protocol: string,
originalReq: NextApiRequest,
fetchResponse: Response,
options: CreateApiHandlerOptions,
) {
const isTls =
protocol === "https:" ||
originalReq.headers["x-forwarded-proto"] === "https"
const secure =
options.forceCookieSecure === undefined ? isTls : options.forceCookieSecure
const forwarded = originalReq.rawHeaders.findIndex(
(h) => h.toLowerCase() === "x-forwarded-host",
)
const host =
forwarded > -1
? originalReq.rawHeaders[forwarded + 1]
: originalReq.headers.host
const domain = guessCookieDomain(host, options)
return parse(
splitCookiesString(fetchResponse.headers.get("set-cookie") || ""),
)
.map((cookie) => ({
...cookie,
domain,
secure,
encode: (v: string) => v,
}))
.map(({ value, name, ...options }) =>
serialize(name, value, options as CookieSerializeOptions),
)
}
/**
* Creates a NextJS / Vercel API Handler
*
* For this handler to work, please set the environment variable `ORY_SDK_URL`.
*/
export function createApiHandler(options: CreateApiHandlerOptions) {
const baseUrl = getBaseUrl(options)
return async (req: NextApiRequest, res: NextApiResponse<string>) => {
const { paths, ...query } = req.query
const searchParams = new URLSearchParams()
Object.keys(query).forEach((key) => {
searchParams.set(key, String(query[key]))
})
const path = Array.isArray(paths) ? paths.join("/") : paths
const url = new URL(path, baseUrl)
url.search = searchParams.toString()
if (path === "ui/welcome") {
// A special for redirecting to the home page
// if we were being redirected to the hosted UI
// welcome page.
res.redirect(303, "../../../")
return
}
const headers = filterRequestHeaders(
req.headers,
options.forwardAdditionalHeaders,
)
headers.set("X-Ory-Base-URL-Rewrite", "false")
headers.set("Ory-Base-URL-Rewrite", "false")
headers.set("Ory-No-Custom-Domain-Redirect", "true")
// Only effective in CI.
Iif (
process.env.ORY_CI_RATE_LIMIT_HEADER &&
process.env.ORY_CI_RATE_LIMIT_HEADER_VALUE
) {
headers.set(
process.env.ORY_CI_RATE_LIMIT_HEADER,
process.env.ORY_CI_RATE_LIMIT_HEADER_VALUE,
)
}
const response = await fetch(url, {
method: req.method,
headers,
body:
req.method !== "GET" && req.method !== "HEAD"
? await readRawBody(req)
: null,
redirect: "manual",
})
for (const [key, value] of response.headers) {
res.appendHeader(key, value)
}
res.removeHeader("set-cookie")
res.removeHeader("location")
Eif (response.headers.get("set-cookie")) {
const cookies = processSetCookieHeader(
(req as unknown as { protocol: string }).protocol,
req,
response,
options,
)
cookies.forEach((cookie) => {
res.appendHeader("Set-Cookie", cookie)
})
}
if (response.headers.get("location")) {
const location = processLocationHeader(
response.headers.get("location"),
baseUrl,
)
res.setHeader("Location", location)
}
res.removeHeader("transfer-encoding")
res.removeHeader("content-encoding")
res.removeHeader("content-length")
res.status(response.status)
const buf = Buffer.from(await response.arrayBuffer())
Eif (buf.byteLength > 0) {
if (isText(null, buf)) {
res.send(
buf.toString("utf-8").replace(new RegExp(baseUrl, "g"), "/api/.ory"),
)
} else E{
res.write(buf)
}
}
res.end()
}
}
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