Header to field

The following example takes the value from the applicationId header and appends it as a new field to the value of the message.

Configuration

{
  "transforms" : "headerToField",
  "transforms.headerToField.type" : "com.github.jcustenborder.kafka.connect.transform.common.HeaderToField$Value",
  "transforms.headerToField.header.mappings" : "applicationId:STRING"
}

Input

{
  "topic" : "testing",
  "kafkaPartition" : 1,
  "valueSchema" : {
    "type" : "STRUCT",
    "isOptional" : false,
    "fieldSchemas" : {
      "firstName" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "lastName" : {
        "type" : "STRING",
        "isOptional" : true
      }
    }
  },
  "value" : {
    "schema" : {
      "type" : "STRUCT",
      "isOptional" : false,
      "fieldSchemas" : {
        "firstName" : {
          "type" : "STRING",
          "isOptional" : true
        },
        "lastName" : {
          "type" : "STRING",
          "isOptional" : true
        }
      }
    },
    "fieldValues" : [ {
      "name" : "firstName",
      "schema" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "storage" : "example"
    }, {
      "name" : "lastName",
      "schema" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "storage" : "user"
    } ]
  },
  "timestamp" : 123412351,
  "timestampType" : "NO_TIMESTAMP_TYPE",
  "offset" : 12345,
  "headers" : [ {
    "name" : "applicationId",
    "schema" : {
      "type" : "STRING",
      "isOptional" : false
    },
    "storage" : "testing"
  } ]
}

Change(s) in the output are emphasized if delta(s) are detected.

Output

{
  "topic" : "testing",
  "kafkaPartition" : 1,
  "valueSchema" : {
    "type" : "STRUCT",
    "isOptional" : false,
    "fieldSchemas" : {
      "firstName" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "lastName" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "applicationId" : {
        "type" : "STRING",
        "isOptional" : true
      }
    }
  },
  "value" : {
    "schema" : {
      "type" : "STRUCT",
      "isOptional" : false,
      "fieldSchemas" : {
        "firstName" : {
          "type" : "STRING",
          "isOptional" : true
        },
        "lastName" : {
          "type" : "STRING",
          "isOptional" : true
        },
        "applicationId" : {
          "type" : "STRING",
          "isOptional" : true
        }
      }
    },
    "fieldValues" : [ {
      "name" : "firstName",
      "schema" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "storage" : "example"
    }, {
      "name" : "lastName",
      "schema" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "storage" : "user"
    }, {
      "name" : "applicationId",
      "schema" : {
        "type" : "STRING",
        "isOptional" : true
      },
      "storage" : "testing"
    } ]
  },
  "timestamp" : 123412351,
  "timestampType" : "NO_TIMESTAMP_TYPE",
  "offset" : 12345,
  "headers" : [ {
    "name" : "applicationId",
    "schema" : {
      "type" : "STRING",
      "isOptional" : false
    },
    "storage" : "testing"
  } ]
}