Support Private From field

[trung]

Private From indicates the public key of the sender Tessera. By default Tessera will take the first key in its config. However, Tessera can manage multiple keys.

User should be able to select keys from the connected Tessera for Private From field

[bmcd]

Once we have an endpoint on the 3rd party server that gives us those keys we can add this feature

[trung]

Indeed, /partyinfo provides url which can be used to filter keys belonging to the Tessera node.
E.g.: In the below party info JSON, url is http://172.16.239.101:9000/ and this value is used to filter only keys matching with the value

{
  "url": "http://172.16.239.101:9000/",
  "peers": [
    {
      "url": "http://172.16.239.102:9000/",
      "lastContact": "2019-11-13T19:18:16.712Z"
    },
    {
      "url": "http://172.16.239.101:9000/",
      "lastContact": "2019-11-13T19:18:18.191Z"
    },
    {
      "url": "http://172.16.239.103:9000/",
      "lastContact": "2019-11-13T19:18:18.106Z"
    }
  ],
  "keys": [
    {
      "key": "T/XI88Mve2Xacso1wRwb38oMVkRe0Lv6N9sh27Ra/CI=",
      "url": "http://172.16.239.102:9000/"
    },
    {
      "key": "6eutyLl6MiuB2OePngk8FpEas3SYvbdSoSLDC7fUmAM=",
      "url": "http://172.16.239.101:9000/"
    },
    {
      "key": "Zw/4lsanZrRFY66auRrxjvDSxr7Rs+k0zBnFNL/DG1A=",
      "url": "http://172.16.239.101:9000/"
    },
    {
      "key": "OtiLC2xcGE/biywtRKbKcU5IcVMFI2HARPtTwwpph3o=",
      "url": "http://172.16.239.101:9000/"
    },
    {
      "key": "/1hWFJkOsPor8hUvaj6iQ14lck5+HvyHyxzAoUs2ITs=",
      "url": "http://172.16.239.101:9000/"
    },
    {
      "key": "6yV8kcLrlBZScHbXE8qltuHtQ0MJjToCm0KUnsEp1AM=",
      "url": "http://172.16.239.102:9000/"
    },
    {
      "key": "AdgDRwPyhshYc0jwaSLpIAj4nQ8+herBFntIv/+QExw=",
      "url": "http://172.16.239.103:9000/"
    }
  ]
}

[bmcd]

Consensys/tessera#917 Consensys/tessera#918 Consensys/tessera#920

^^^ Those make this not really possible anymore. The P2P apis shouldn't really be open to the world, and they are disabling CORS altogether for P2P.

They are adding /partyinfo/keys to 3rdParty, but it no longer includes urls. They will be adding a new endpoint for the current keys in the tessera node soon (or maybe just adding it to that response, i don't know). Once they add that we should be able to do privateFrom properly.