Spring Cloud Stream Binding Configuration

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/api-evangelist/spring-cloud-stream/json-schema/spring-cloud-stream-binding-schema.json",
  "title": "Spring Cloud Stream Binding Configuration",
  "description": "JSON Schema for Spring Cloud Stream binding configuration properties in application.yml/properties.",
  "type": "object",
  "properties": {
    "spring": {
      "type": "object",
      "properties": {
        "cloud": {
          "type": "object",
          "properties": {
            "stream": {
              "type": "object",
              "description": "Spring Cloud Stream configuration root",
              "properties": {
                "function": {
                  "type": "object",
                  "properties": {
                    "definition": {
                      "type": "string",
                      "description": "Semicolon-delimited list of function bean names to bind"
                    },
                    "bindings": {
                      "type": "object",
                      "description": "Mapping of function names to binding names",
                      "additionalProperties": {
                        "type": "string"
                      }
                    }
                  }
                },
                "bindings": {
                  "type": "object",
                  "description": "Per-binding configuration",
                  "additionalProperties": {
                    "$ref": "#/$defs/BindingProperties"
                  }
                },
                "default": {
                  "type": "object",
                  "description": "Default binding properties applied to all bindings",
                  "$ref": "#/$defs/BindingProperties"
                },
                "kafka": {
                  "$ref": "#/$defs/KafkaBinderProperties"
                },
                "rabbit": {
                  "$ref": "#/$defs/RabbitBinderProperties"
                }
              }
            }
          }
        }
      }
    }
  },
  "$defs": {
    "BindingProperties": {
      "type": "object",
      "properties": {
        "destination": {
          "type": "string",
          "description": "Topic or exchange name on the broker"
        },
        "group": {
          "type": "string",
          "description": "Consumer group name (enables durable subscription)"
        },
        "contentType": {
          "type": "string",
          "default": "application/json",
          "description": "Content type for message serialization"
        },
        "binder": {
          "type": "string",
          "description": "Named binder to use (if multiple binders configured)"
        },
        "consumer": {
          "$ref": "#/$defs/ConsumerProperties"
        },
        "producer": {
          "$ref": "#/$defs/ProducerProperties"
        }
      }
    },
    "ConsumerProperties": {
      "type": "object",
      "properties": {
        "autoStartup": {
          "type": "boolean",
          "default": true,
          "description": "Whether to auto-start the consumer on application startup"
        },
        "concurrency": {
          "type": "integer",
          "default": 1,
          "description": "Number of concurrent consumer threads"
        },
        "partitioned": {
          "type": "boolean",
          "default": false,
          "description": "Whether the consumer receives data from a partitioned producer"
        },
        "maxAttempts": {
          "type": "integer",
          "default": 3,
          "description": "Number of attempts to process a message before sending to DLQ"
        },
        "backOffInitialInterval": {
          "type": "integer",
          "default": 1000,
          "description": "Initial backoff interval in milliseconds for retries"
        },
        "backOffMaxInterval": {
          "type": "integer",
          "default": 10000,
          "description": "Maximum backoff interval in milliseconds for retries"
        }
      }
    },
    "ProducerProperties": {
      "type": "object",
      "properties": {
        "partitionKeyExpression": {
          "type": "string",
          "description": "SpEL expression to determine partition key from outbound message"
        },
        "partitionCount": {
          "type": "integer",
          "default": 1,
          "description": "Number of target partitions for this producer"
        },
        "requiredGroups": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Consumer groups that must exist before sending"
        }
      }
    },
    "KafkaBinderProperties": {
      "type": "object",
      "properties": {
        "binders": {
          "type": "object",
          "properties": {
            "kafka": {
              "type": "object",
              "properties": {
                "brokers": {
                  "type": "array",
                  "items": { "type": "string" },
                  "description": "List of Kafka broker addresses"
                },
                "defaultBrokerPort": {
                  "type": "integer",
                  "default": 9092
                },
                "autoCreateTopics": {
                  "type": "boolean",
                  "default": true
                },
                "replicationFactor": {
                  "type": "integer",
                  "default": 1
                }
              }
            }
          }
        }
      }
    },
    "RabbitBinderProperties": {
      "type": "object",
      "properties": {
        "binders": {
          "type": "object",
          "properties": {
            "rabbit": {
              "type": "object",
              "properties": {
                "addresses": {
                  "type": "string",
                  "description": "Comma-separated list of broker addresses"
                },
                "virtualHost": {
                  "type": "string",
                  "default": "/"
                },
                "username": { "type": "string" },
                "password": { "type": "string" }
              }
            }
          }
        }
      }
    }
  }
}