Firebase Cloud Functions - 从 https 中的上下文获取来源可调用 function

Question

I have a cloud function which sends a custom email verification email, which contains a link which redirects back to my website. The problem I have is that when I am testing on localhost, the redirect URL goes to the production site. I know this is the expected behaviour.

Is there a way to use the context data that the https callable function recieves to get the origin URL to generate a more specific redirect URL?

I cannot stringify the context object without getting a TypeError: Converting circular structure to JSON error, but when I log that to the console, in the cloud functions logs in the firebase console I see the origin URL deep in the JSON object.

Snippet from console:

headers: 
      { host: 'us-central1-universal-alert.cloudfunctions.net',
        'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36',
        'transfer-encoding': 'chunked',
        accept: '*/*',
        'accept-encoding': 'gzip, deflate, br',
        'accept-language': 'en-GB,en-US;q=0.9,en;q=0.8,fr;q=0.7',
        authorization: 'Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6ImZjMmM4YmIyNmE3OGM0M2JkODYzNzA1YjNkNzkyMWI0ZTY0MjVkNTQiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vdW5pdmVyc2FsLWFsZXJ0IiwiYXVkIjoidW5pdmVyc2FsLWFsZXJ0IiwiYXV0aF90aW1lIjoxNTg5MjQ0MDg3LCJ1c2VyX2lkIjoiNjJwaGJmQTRvTVUyT3E5aVpzSm5zZXZNd2hNMiIsInN1YiI6IjYycGhiZkE0b01VMk9xOWlac0puc2V2TXdoTTIiLCJpYXQiOjE1ODkyNDQwODcsImV4cCI6MTU4OTI0NzY4NywiZW1haWwiOiJiZW5yc29tbWVyQGljbG91ZC5jb20iLCJlbWFpbF92ZXJpZmllZCI6ZmFsc2UsImZpcmViYXNlIjp7ImlkZW50aXRpZXMiOnsiZW1haWwiOlsiYmVucnNvbW1lckBpY2xvdWQuY29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0.luzWFCR3xr7OmbAp38_qXTlEv800_NMZUBqfa_DfHc5pM9i4CRBr5en3AjzRIjJP2AYF50Z3OE4c7LvnD5VPhEMLmDJcl8xwe_q0uzlMxIIEQdUANui0eFIEK__mFbZS9QmoBwFP4mBa2diuRaZsuUW0rJXkPCzweeiIvJoeGDfGnYnz1KKH1KuDdPKb5sFcHxKCnMCnyr61rDYDEfFbOwDrZBuC94gtrEQtwqb5ruy453CJk0v1wVU8NpbgMhOUvq4AHYCRtNFAqmDDKFNYr1WJTdx3Eqmcn2segocXj-MdQzT5FZtdpxtRad8SKA1FCI03vBYNQDL8rtwFaVFt_A',
        'content-type': 'application/json',
        forwarded: 'for="81.111.170.171";proto=https',
        'function-execution-id': 'b2egqxx6o36z',
        origin: 'http://localhost:3000',
        referer: 'http://localhost:3000/sign-up',
        'sec-fetch-dest': 'empty',
        'sec-fetch-mode': 'cors',
        'sec-fetch-site': 'cross-site',
        'x-appengine-city': 'chesham',
        'x-appengine-citylatlong': '51.709401,-0.612333',
        'x-appengine-country': 'GB',
        'x-appengine-default-version-hostname': 'uc2d66f008c134574p-tp.appspot.com',
        'x-appengine-https': 'on',
        'x-appengine-region': 'eng',
        'x-appengine-request-log-id': '5eb9f0ea00ff0d575c33c56a980001737e7563326436366630303863313334353734702d7470000133646535326134613634643339346235623664653837626165353130396466393a3230000100',
        'x-appengine-user-ip': '81.111.170.171',
        'x-cloud-trace-context': '17c316a639a7d55b4e52ddc72c5ae94f/11631072639755688744',
        'x-forwarded-for': '81.111.170.171',
        'x-forwarded-proto': 'https',
        connection: 'close' },
     rawHeaders: 
      [ 'Host',
        'us-central1-universal-alert.cloudfunctions.net',
        'User-Agent',
        'Mozilla/5.0 (Macintosh

Is the origin value here guaranteed and reliable? Is there a better way to implement this?

Answer 1

It looks like you can just send the value of context.rawRequest.headers.origin . No need to send the entire object.