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feat: add RFC8628 - OAuth 2.0 Device Authorization Grant (Device Flow…
…) support
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Original file line number | Diff line number | Diff line change |
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/* eslint-disable camelcase */ | ||
const { inspect } = require('util'); | ||
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const { RPError, OPError } = require('./errors'); | ||
const instance = require('./helpers/weak_cache'); | ||
const now = require('./helpers/unix_timestamp'); | ||
const { authenticatedPost } = require('./helpers/client'); | ||
const processResponse = require('./helpers/process_response'); | ||
const TokenSet = require('./token_set'); | ||
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class DeviceFlowHandle { | ||
constructor({ | ||
client, exchangeBody, clientAssertionPayload, response, maxAge, | ||
}) { | ||
['verification_uri', 'user_code', 'device_code'].forEach((prop) => { | ||
if (typeof response[prop] !== 'string' || !response[prop]) { | ||
throw new RPError(`expected ${prop} string to be returned by Device Authorization Response, got %j`, response[prop]); | ||
} | ||
}); | ||
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if (!Number.isSafeInteger(response.expires_in)) { | ||
throw new RPError('expected expires_in number to be returned by Device Authorization Response, got %j', response.expires_in); | ||
} | ||
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instance(this).expires_at = now() + response.expires_in; | ||
instance(this).client = client; | ||
instance(this).maxAge = maxAge; | ||
instance(this).exchangeBody = exchangeBody; | ||
instance(this).clientAssertionPayload = clientAssertionPayload; | ||
instance(this).response = response; | ||
instance(this).interval = response.interval * 1000 || 5000; | ||
} | ||
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async poll() { | ||
if (this.expired()) { | ||
throw new RPError('the device code %j has expired and the device authorization session has concluded', this.device_code); | ||
} | ||
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await new Promise((resolve) => setTimeout(resolve, instance(this).interval)); | ||
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const response = await authenticatedPost.call( | ||
instance(this).client, | ||
'token', | ||
{ | ||
form: true, | ||
body: { | ||
...instance(this).exchangeBody, | ||
grant_type: 'urn:ietf:params:oauth:grant-type:device_code', | ||
device_code: this.device_code, | ||
}, | ||
json: true, | ||
}, | ||
{ clientAssertionPayload: instance(this).clientAssertionPayload }, | ||
); | ||
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let responseBody; | ||
try { | ||
responseBody = processResponse(response); | ||
} catch (err) { | ||
switch (err instanceof OPError && err.error) { | ||
case 'slow_down': | ||
instance(this).interval += 5000; | ||
case 'authorization_pending': // eslint-disable-line no-fallthrough | ||
return this.poll(); | ||
default: | ||
throw err; | ||
} | ||
} | ||
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const tokenset = new TokenSet(responseBody); | ||
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if ('id_token' in tokenset) { | ||
await instance(this).client.decryptIdToken(tokenset); | ||
await instance(this).client.validateIdToken(tokenset, undefined, 'token', instance(this).maxAge); | ||
} | ||
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return tokenset; | ||
} | ||
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get device_code() { | ||
return instance(this).response.device_code; | ||
} | ||
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get user_code() { | ||
return instance(this).response.user_code; | ||
} | ||
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get verification_uri() { | ||
return instance(this).response.verification_uri; | ||
} | ||
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get verification_uri_complete() { | ||
return instance(this).response.verification_uri_complete; | ||
} | ||
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get expires_in() { | ||
return Math.max.apply(null, [instance(this).expires_at - now(), 0]); | ||
} | ||
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expired() { | ||
return this.expires_in === 0; | ||
} | ||
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/* istanbul ignore next */ | ||
[inspect.custom]() { | ||
return `${this.constructor.name} ${inspect(instance(this).response, { | ||
depth: Infinity, | ||
colors: process.stdout.isTTY, | ||
compact: false, | ||
sorted: true, | ||
})}`; | ||
} | ||
} | ||
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module.exports = DeviceFlowHandle; |
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