Make it work with Mattermost

[srosset81]

Currently the Accept activity returned by Mattermost is rejected with a 401 error.

[srosset81]

Digest verification fails

Headers:

{
  host: 'passerelles.colibris-outilslibres.org',
  'user-agent': 'http.rb/5.0.4 (Mastodon/3.5.3; +https://framapiaf.org/)',
  'content-length': '2163',
  'accept-encoding': 'gzip',
  'content-type': 'application/activity+json',
  date: 'Tue, 12 Jul 2022 15:47:26 GMT',
  digest: 'SHA-256=gzNmJMzfSiUmGHjmJHE7yMOv2W60+5TtenNy/YKH9pk=',
  signature: 'keyId="https://framapiaf.org/users/srosset#main-key",algorithm="rsa-sha256",headers="(request-target) host date digest content-type",signature="V642qEgrFO9KLaXypXibod99eyX/Z5kwniBPgltGN5J2eTxEdZwnruK8BKpL8kVP0U5W0rsebfmdPXrrGEpSj+jU19Vm7Nb5/+kdijY5DM9MoXwrPNhOV9rBRCeOoxw/9WU/BL9tshLR3ZM1ZMWDALBvo5JY7WtgQc36hVw0AcJQQWrCGMCzFNeduZ/wk2Ttci6/XxwdNS6WKKRrkZvfM4feHeI46l2cfaZravNTx17F/PbArMQTlzjbFQWrKU/7H/QMCyv538tAtz0v/GTsToh9/V39d+XP7j44gN2o/OUtnTUKv9OYDFSBmbOPajOFkL4BN3W7yMhTgGhgCquuVg=="',
  'x-forwarded-for': '88.99.213.22',
  'x-forwarded-host': 'passerelles.colibris-outilslibres.org',
  'x-forwarded-port': '443',
  'x-forwarded-proto': 'https',
  'x-forwarded-server': '61e93ac4d2ee',
  'x-real-ip': '88.99.213.22'
}

Body JSON.stringified:

{"@context":["https://www.w3.org/ns/activitystreams",{"ostatus":"http://ostatus.org#","atomUri":"ostatus:atomUri","inReplyToAtomUri":"ostatus:inReplyToAtomUri","conversation":"ostatus:conversation","sensitive":"as:sensitive","toot":"http://joinmastodon.org/ns#","votersCount":"toot:votersCount"}],"id":"https://framapiaf.org/users/srosset/statuses/108635148588001394/activity","type":"Create","actor":"https://framapiaf.org/users/srosset","published":"2022-07-12T15:46:57Z","to":["https://www.w3.org/ns/activitystreams#Public"],"cc":["https://framapiaf.org/users/srosset/followers"],"object":{"id":"https://framapiaf.org/users/srosset/statuses/108635148588001394","type":"Note","summary":null,"inReplyTo":null,"published":"2022-07-12T15:46:57Z","url":"https://framapiaf.org/@srosset/108635148588001394","attributedTo":"https://framapiaf.org/users/srosset","to":["https://www.w3.org/ns/activitystreams#Public"],"cc":["https://framapiaf.org/users/srosset/followers"],"sensitive":false,"atomUri":"https://framapiaf.org/users/srosset/statuses/108635148588001394","inReplyToAtomUri":null,"conversation":"tag:framapiaf.org,2022-07-12:objectId=60297439:objectType=Conversation","content":"<p>Test encore</p>","contentMap":{"fr":"<p>Test encore</p>"},"attachment":[],"tag":[],"replies":{"id":"https://framapiaf.org/users/srosset/statuses/108635148588001394/replies","type":"Collection","first":{"type":"CollectionPage","next":"https://framapiaf.org/users/srosset/statuses/108635148588001394/replies?only_other_accounts=true&page=true","partOf":"https://framapiaf.org/users/srosset/statuses/108635148588001394/replies","items":[]}}},"signature":{"type":"RsaSignature2017","creator":"https://framapiaf.org/users/srosset#main-key","created":"2022-07-12T15:47:08Z","signatureValue":"jDoKmqhuMwtfjhktrfmDzcmPiTSnC2+o6CpZNsTJyMJAoj7iTWPWfWYFv3+hht0WHEwPmGhfh6JlmQc+pClMrFfPOp17RrAvnBT6t1pdfsbmQXD9DzTmA+gtVpV1Jaf/m82IkL0cfWmYXuUgAOv2eFxu2yzw8VS33oMEzSwLDpPCvuu+PAMlT/UdXjNf5OwEDbRfdxe+YXFqgbvEx5AGQVGkkFUY/lOVp9tEvYM1BtpLJawmb56TCNFbtXJ+L/t+Okgd5oud51hpmw6W8Hg3/n8iCaA+USYMFikUy9HxW2MG+AtM8WXiar84MWIZ7ZuaCwQDM8+KAW3RlkuJevtkAQ=="}}

The signature in the body is strange. But even if I remove it, it is still not working. Maybe instead of doing a JSON.stringify, I should get the body itself from the API ?