generate json-schema dynamically in Go

internal/module/module.go

@@ -5,6 +5,7 @@ import (
 	"log/slog"
 	"sync"
 
+	"github.com/google/jsonschema-go/jsonschema"
 	"github.com/jwetzell/showbridge-go/internal/common"
 	"github.com/jwetzell/showbridge-go/internal/config"
 )
@@ -16,8 +17,11 @@ type ModuleError struct {
 }
 
 type ModuleRegistration struct {
-	Type string `json:"type"`
-	New  func(config.ModuleConfig) (common.Module, error)
+	Type         string             `json:"type"`
+	Title        string             `json:"title,omitempty"`
+	Description  string             `json:"description,omitempty"`
+	ParamsSchema *jsonschema.Schema `json:"paramsSchema,omitempty"`
+	New          func(config.ModuleConfig) (common.Module, error)
 }
 
 func RegisterModule(mod ModuleRegistration) {
@@ -46,3 +50,49 @@ var (
 func CreateLogger(config config.ModuleConfig) *slog.Logger {
 	return slog.Default().With("component", "module", "id", config.Id, "type", config.Type)
 }
+
+func GetModulesSchema() *jsonschema.Schema {
+	moduleRegistryMu.RLock()
+	defer moduleRegistryMu.RUnlock()
+
+	schema := &jsonschema.Schema{
+		Schema:      "https://json-schema.org/draft/2020-12/schema",
+		ID:          "https://showbridge.io/modules.schema.json",
+		Title:       "Modules",
+		Description: "module configurations",
+		Type:        "array",
+	}
+
+	moduleDefinitionSchemas := []*jsonschema.Schema{}
+	for _, mod := range ModuleRegistry {
+		moduleSchema := &jsonschema.Schema{
+			Type: "object",
+			Properties: map[string]*jsonschema.Schema{
+				"id": {
+					Type:      "string",
+					MinLength: jsonschema.Ptr(1),
+				},
+				"type": {
+					Const: jsonschema.Ptr[any](mod.Type),
+				},
+			},
+			Required:             []string{"id", "type"},
+			AdditionalProperties: nil,
+		}
+		if mod.Title != "" {
+			moduleSchema.Title = mod.Title
+		}
+		if mod.Description != "" {
+			moduleSchema.Description = mod.Description
+		}
+		if mod.ParamsSchema != nil {
+			moduleSchema.Properties["params"] = mod.ParamsSchema
+			moduleSchema.Required = append(moduleSchema.Required, "params")
+		}
+		moduleDefinitionSchemas = append(moduleDefinitionSchemas, moduleSchema)
+	}
+	schema.Items = &jsonschema.Schema{
+		OneOf: moduleDefinitionSchemas,
+	}
+	return schema
+}