generate json-schema dynamically in Go

internal/processor/processor.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"sync"
 
+	"github.com/google/jsonschema-go/jsonschema"
 	"github.com/jwetzell/showbridge-go/internal/common"
 	"github.com/jwetzell/showbridge-go/internal/config"
 )
@@ -15,8 +16,11 @@ type Processor interface {
 }
 
 type ProcessorRegistration struct {
-	Type string `json:"type"`
-	New  func(config.ProcessorConfig) (Processor, error)
+	Type         string             `json:"type"`
+	Title        string             `json:"title,omitempty"`
+	Description  string             `json:"description,omitempty"`
+	ParamsSchema *jsonschema.Schema `json:"paramsSchema,omitempty"`
+	New          func(config.ProcessorConfig) (Processor, error)
 }
 
 func RegisterProcessor(processor ProcessorRegistration) {
@@ -41,3 +45,45 @@ var (
 	processorRegistryMu sync.RWMutex
 	ProcessorRegistry   = make(map[string]ProcessorRegistration)
 )
+
+func GetProcessorsSchema() *jsonschema.Schema {
+	processorRegistryMu.RLock()
+	defer processorRegistryMu.RUnlock()
+
+	schema := &jsonschema.Schema{
+		Schema:      "https://json-schema.org/draft/2020-12/schema",
+		ID:          "https://showbridge.io/processors.schema.json",
+		Title:       "Processors",
+		Description: "processor configurations",
+		Type:        "array",
+	}
+
+	processorDefinitionSchemas := []*jsonschema.Schema{}
+	for _, proc := range ProcessorRegistry {
+		processorSchema := &jsonschema.Schema{
+			Type: "object",
+			Properties: map[string]*jsonschema.Schema{
+				"type": {
+					Const: jsonschema.Ptr[any](proc.Type),
+				},
+			},
+			Required:             []string{"type"},
+			AdditionalProperties: nil,
+		}
+		if proc.Title != "" {
+			processorSchema.Title = proc.Title
+		}
+		if proc.Description != "" {
+			processorSchema.Description = proc.Description
+		}
+		if proc.ParamsSchema != nil {
+			processorSchema.Properties["params"] = proc.ParamsSchema
+			processorSchema.Required = append(processorSchema.Required, "params")
+		}
+		processorDefinitionSchemas = append(processorDefinitionSchemas, processorSchema)
+	}
+	schema.Items = &jsonschema.Schema{
+		OneOf: processorDefinitionSchemas,
+	}
+	return schema
+}