Can't create IOS_DISTRIBUTION certificate using AppStore Connect API. Error 409/ENTITY_ERROR.ATTRIBUTE.INVALID/Invalid Certificate

Question

I'm trying to create a certificate using AppStore Connect API . For that I created valid (I used it to fetch certificates list using GET method, it works) JWT token: eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiIsImtpZCI6IkZZREszQlVIOE0ifQ.eyJpc3MiOiIwNWNiN2M3Yy00Y2RkLTRlYjMtYWRiZC1kNzkwYWEyYTBhNjEiLCJleHAiOjE1ODc3OTg1MjMuMjI3ODIyLCJhdWQiOiJhcHBzdG9yZWNvbm5lY3QtdjEifQ.Vs1xpLL2xF_WtQNXg3m1XySG-mdSsR2fQalhDgFy5NkIhtRWtWfxkyxMOTe3la-zqWAKjZ7iiCGf8Fkm5_cl2Q

Pretty printed JSON Http body is:

{
  "data":{
    "attributes":{
      "certificateType":"IOS_DISTRIBUTION",
      "csrContent":"'$(cat private.csr | base64)'"
    },
    "type":"certificates"
  }
} 

where private.csr file generated by Keychain Access and contains:

-----BEGIN CERTIFICATE REQUEST-----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-----END CERTIFICATE REQUEST-----

Next I perform curl request:

curl -v -X POST  -H 'Content-Type: application/json' -H 'Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiIsImtpZCI6IkZZREszQlVIOE0ifQ.eyJpc3MiOiIwNWNiN2M3Yy00Y2RkLTRlYjMtYWRiZC1kNzkwYWEyYTBhNjEiLCJleHAiOjE1ODc3OTg1MjMuMjI3ODIyLCJhdWQiOiJhcHBzdG9yZWNvbm5lY3QtdjEifQ.Vs1xpLL2xF_WtQNXg3m1XySG-mdSsR2fQalhDgFy5NkIhtRWtWfxkyxMOTe3la-zqWAKjZ7iiCGf8Fkm5_cl2Q' -d '{"data":{"attributes":{"certificateType":"IOS_DISTRIBUTION","csrContent":"'$(cat private.csr | base64)'"},"type":"certificates"}}' https://api.appstoreconnect.apple.com/v1/certificates

But server responds the error:

 < HTTP/1.1 100 Continue * We are completely uploaded and fine < HTTP/1.1 409 Conflict < Server: daiquiri/3.0.0 < Date: Sat, 25 Apr 2020 07:20:08 GMT < Content-Type: */* < Content-Length: 254 < Connection: keep-alive < Cache-Control: no-store, no-cache, must-revalidate < Pragma: no-cache < X-XSS-Protection: 1; mode=block < X-Frame-Options: ALLOW-FROM https://devcms.apple.com SAMEORIGIN < Strict-Transport-Security: max-age=31536000; includeSubDomains < X-Request-ID: QRCVNTSDFD6UA4O62U7ZZM67ZM < X-Rate-Limit: user-hour-lim:3600;user-hour-rem:3598; < x-daiquiri-instance: daiquiri:38493002:pv50p00it-hyhk10063901:7987:20E24 < { "errors": [ { "id": "7470a152-5d89-4d85-8e6e-987754c519c3", "status": "409", "code": "ENTITY_ERROR.ATTRIBUTE.INVALID", "title": "An attribute in the provided entity has invalid value", "detail": "Invalid Certificate" } ] * Connection #0 to host api.appstoreconnect.apple.com left intact

I already have no idea what is wrong. I checked that there are no limits for iOS Distribution certificates in my account.

Answer 1

After a couple a days I found the issue. It was that I base64 encoded CSR file. Don't need to do it, this file is already contains BASE64 data in between

-----BEGIN CERTIFICATE REQUEST-----
...
BASE64 ENCODED DATA 
...
-----END CERTIFICATE REQUEST-----

So the correct body is

{
  "data":{
    "attributes":{
      "certificateType":"IOS_DISTRIBUTION",
      "csrContent":"'$(cat private.csr)'"
    },
    "type":"certificates"
  }
}