support basic http server response control with body string template for now

internal/processor/http-response-create.go

@@ -0,0 +1,81 @@
+package processor
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"text/template"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+)
+
+type HTTPResponseCreate struct {
+	Status int
+	Body   *template.Template
+	config config.ProcessorConfig
+}
+
+type HTTPResponse struct {
+	Status int
+	Body   []byte
+}
+
+func (hre *HTTPResponseCreate) Process(ctx context.Context, payload any) (any, error) {
+	var bodyBuffer bytes.Buffer
+	err := hre.Body.Execute(&bodyBuffer, payload)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return HTTPResponse{
+		Status: hre.Status,
+		Body:   bodyBuffer.Bytes(),
+	}, nil
+}
+
+func (hre *HTTPResponseCreate) Type() string {
+	return hre.config.Type
+}
+
+func init() {
+	RegisterProcessor(ProcessorRegistration{
+		Type: "http.response.create",
+		New: func(config config.ProcessorConfig) (Processor, error) {
+			params := config.Params
+
+			status, ok := params["status"]
+
+			if !ok {
+				return nil, errors.New("http.response.create requires a status parameter")
+			}
+
+			statusNum, ok := status.(float64)
+
+			if !ok {
+				return nil, errors.New("http.resposne.create status must be a number")
+			}
+
+			body, ok := params["body"]
+
+			if !ok {
+				return nil, errors.New("osc.message.create requires an body parameter")
+			}
+
+			bodyString, ok := body.(string)
+
+			if !ok {
+				return nil, errors.New("osc.message.create body must be a string")
+			}
+
+			bodyTemplate, err := template.New("body").Parse(bodyString)
+
+			if err != nil {
+				return nil, err
+			}
+
+			// TODO(jwetzell): support other body kind (direct bytes from input, from file?)
+			return &HTTPResponseCreate{config: config, Status: int(statusNum), Body: bodyTemplate}, nil
+		},
+	})
+}