Initial commit

internal/server/route/form.go

@@ -0,0 +1,161 @@
+package route
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+
+	"forge.cadoles.com/wpetit/formidable/internal/jsonpointer"
+	"forge.cadoles.com/wpetit/formidable/internal/server/template"
+	"github.com/pkg/errors"
+	"github.com/santhosh-tekuri/jsonschema/v5"
+)
+
+func createRenderFormHandlerFunc(schema *jsonschema.Schema, defaults, values interface{}) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		data := &template.FormItemData{
+			Parent:   nil,
+			Schema:   schema,
+			Property: "",
+			Defaults: defaults,
+			Values:   values,
+		}
+
+		if err := schema.Validate(data.Values); err != nil {
+			validationErr, ok := err.(*jsonschema.ValidationError)
+			if !ok {
+				panic(errors.Wrap(err, "could not validate values"))
+			}
+
+			data.Error = validationErr
+		}
+
+		if err := template.Exec("index.html.tmpl", w, data); err != nil {
+			panic(errors.WithStack(err))
+		}
+	}
+}
+
+func createHandleFormHandlerFunc(schema *jsonschema.Schema, defaults, values interface{}) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		data := &template.FormItemData{
+			Parent:   nil,
+			Schema:   schema,
+			Property: "",
+			Defaults: defaults,
+			Values:   values,
+		}
+
+		if err := r.ParseForm(); err != nil {
+			panic(errors.WithStack(err))
+		} else {
+			values, err = handleForm(r.Form, schema, values)
+			if err != nil {
+				panic(errors.WithStack(err))
+			}
+
+			data.Values = values
+		}
+
+		if err := schema.Validate(data.Values); err != nil {
+			validationErr, ok := err.(*jsonschema.ValidationError)
+			if !ok {
+				panic(errors.Wrap(err, "could not validate values"))
+			}
+
+			data.Error = validationErr
+		}
+
+		if err := template.Exec("index.html.tmpl", w, data); err != nil {
+			panic(errors.WithStack(err))
+		}
+	}
+}
+
+func handleForm(form url.Values, schema *jsonschema.Schema, values interface{}) (interface{}, error) {
+	pendingDeletes := make([]string, 0)
+
+	var err error
+
+	for name, fieldValues := range form {
+		if name == "submit" {
+			continue
+		}
+
+		prefix, property, err := parseFieldName(name)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		switch prefix {
+		case "bool":
+			booVal, err := parseBoolean(fieldValues[0])
+			if err != nil {
+				return nil, errors.Wrapf(err, "could not parse boolean field '%s'", property)
+			}
+
+			pointer := jsonpointer.New(property)
+
+			values, err = pointer.Force(values, booVal)
+			if err != nil {
+				return nil, errors.Wrapf(err, "could not set property '%s' with value '%v'", property, fieldValues[0])
+			}
+
+		case "add":
+			pointer := jsonpointer.New(property)
+
+			values, err = pointer.Force(values, nil)
+			if err != nil {
+				return nil, errors.Wrapf(err, "could not add item '%s'", property)
+			}
+
+		case "del":
+			// Mark property for deletion pass
+			pendingDeletes = append(pendingDeletes, property)
+
+		default:
+			pointer := jsonpointer.New(property)
+
+			values, err = pointer.Force(values, fieldValues[0])
+			if err != nil {
+				return nil, errors.Wrapf(err, "could not set property '%s' with value '%v'", property, fieldValues[0])
+			}
+		}
+	}
+
+	for _, property := range pendingDeletes {
+		pointer := jsonpointer.New(property)
+
+		values, err = pointer.Delete(values)
+		if err != nil {
+			return nil, errors.Wrapf(err, "could not delete property '%s'", property)
+		}
+	}
+
+	return values, nil
+}
+
+func parseBoolean(value string) (bool, error) {
+	switch value {
+	case "yes":
+		return true, nil
+	case "no":
+		return false, nil
+	default:
+		return false, errors.Errorf("unexpected boolean value '%s'", value)
+	}
+}
+
+func parseFieldName(name string) (string, string, error) {
+	tokens := strings.SplitN(name, ":", 2)
+
+	if len(tokens) == 1 {
+		return "", tokens[0], nil
+	}
+
+	if len(tokens) == 2 {
+		return tokens[0], tokens[1], nil
+	}
+
+	return "", "", errors.Errorf("unexpected field name '%s'", name)
+}

internal/server/route/handler.go

@@ -0,0 +1,19 @@
+package route
+
+import (
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+	"github.com/santhosh-tekuri/jsonschema/v5"
+)
+
+func NewHandler(schema *jsonschema.Schema, defaults, values interface{}) (*chi.Mux, error) {
+	router := chi.NewRouter()
+
+	router.Use(middleware.RequestID)
+	// router.Use(middleware.Logger)
+
+	router.Get("/", createRenderFormHandlerFunc(schema, defaults, values))
+	router.Post("/", createHandleFormHandlerFunc(schema, defaults, values))
+
+	return router, nil
+}