formidable/internal/server/template/template.go

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package template
import (
"bytes"
"embed"
"fmt"
"html/template"
"io"
"io/fs"
"path"
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"strings"
"forge.cadoles.com/wpetit/formidable/internal/jsonpointer"
"github.com/Masterminds/sprig/v3"
"github.com/davecgh/go-spew/spew"
"github.com/pkg/errors"
"github.com/santhosh-tekuri/jsonschema/v5"
)
var (
layouts map[string]*template.Template
blocks map[string]string
)
func Load(files embed.FS, baseDir string) error {
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if blocks == nil {
blocks = make(map[string]string)
}
blockFiles, err := fs.ReadDir(files, path.Join(baseDir, "blocks"))
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if err != nil {
return errors.WithStack(err)
}
for _, f := range blockFiles {
templateData, err := fs.ReadFile(files, path.Join(baseDir, "blocks/"+f.Name()))
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if err != nil {
return errors.WithStack(err)
}
blocks[f.Name()] = string(templateData)
}
layoutFiles, err := fs.ReadDir(files, path.Join(baseDir, "layouts"))
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if err != nil {
return errors.WithStack(err)
}
for _, f := range layoutFiles {
templateData, err := fs.ReadFile(files, path.Join(baseDir, "layouts/"+f.Name()))
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if err != nil {
return errors.WithStack(err)
}
if err := loadLayout(f.Name(), string(templateData)); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func loadLayout(name string, rawTemplate string) error {
if layouts == nil {
layouts = make(map[string]*template.Template)
}
tmpl := template.New(name)
funcMap := mergeHelpers(
sprig.FuncMap(),
customHelpers(tmpl),
)
tmpl.Funcs(funcMap)
for blockName, b := range blocks {
if _, err := tmpl.Parse(b); err != nil {
return errors.Wrapf(err, "could not parse template block '%s'", blockName)
}
}
tmpl, err := tmpl.Parse(rawTemplate)
if err != nil {
return errors.Wrapf(err, "could not parse template '%s'", name)
}
layouts[name] = tmpl
return nil
}
func Exec(name string, w io.Writer, data interface{}) error {
tmpl, exists := layouts[name]
if !exists {
return errors.Errorf("could not find template '%s'", name)
}
if err := tmpl.Execute(w, data); err != nil {
return errors.WithStack(err)
}
return nil
}
func mergeHelpers(helpers ...template.FuncMap) template.FuncMap {
merged := template.FuncMap{}
for _, help := range helpers {
for name, fn := range help {
merged[name] = fn
}
}
return merged
}
type FormItemData struct {
Parent *FormItemData
Schema *jsonschema.Schema
Property string
Error *jsonschema.ValidationError
Values interface{}
Defaults interface{}
SuccessMessage string
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}
func customHelpers(tpl *template.Template) template.FuncMap {
return template.FuncMap{
"formItemData": func(parent *FormItemData, property string, schema *jsonschema.Schema) *FormItemData {
return &FormItemData{
Parent: parent,
Property: property,
Schema: schema,
Defaults: parent.Defaults,
Values: parent.Values,
Error: parent.Error,
}
},
"dump": func(data interface{}) string {
spew.Dump(data)
return ""
},
"include": func(name string, data interface{}) (template.HTML, error) {
buf := bytes.NewBuffer([]byte{})
if err := tpl.ExecuteTemplate(buf, name, data); err != nil {
return "", errors.WithStack(err)
}
return template.HTML(buf.String()), nil
},
"getFullProperty": func(parent *FormItemData, property string) string {
fullProperty := property
for {
fullProperty = fmt.Sprintf("%s/%s", parent.Property, strings.TrimPrefix(fullProperty, "/"))
parent = parent.Parent
if parent == nil {
break
}
}
return fullProperty
},
"getValue": func(values interface{}, path string) (interface{}, error) {
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if values == nil {
values = make(map[string]interface{})
}
pointer := jsonpointer.New(path)
val, err := pointer.Get(values)
if err != nil && !errors.Is(err, jsonpointer.ErrNotFound) {
return nil, errors.WithStack(err)
}
return val, nil
},
"getItemSchema": func(arraySchema *jsonschema.Schema) (*jsonschema.Schema, error) {
itemSchema := arraySchema.Items
if itemSchema == nil {
itemSchema = arraySchema.Items2020
}
if itemSchema == nil {
return nil, errors.New("item schema not found")
}
switch schema := itemSchema.(type) {
case *jsonschema.Schema:
return schema, nil
case []*jsonschema.Schema:
if len(schema) > 0 {
return schema[0], nil
}
return nil, errors.New("no item schema found")
default:
return nil, errors.Errorf("unexpected schema type '%T'", schema)
}
},
"getPropertyError": findPropertyValidationError,
}
}
func findPropertyValidationError(err *jsonschema.ValidationError, property string) *jsonschema.ValidationError {
if err == nil {
return nil
}
if property == err.InstanceLocation {
return err
}
for _, cause := range err.Causes {
if err := findPropertyValidationError(cause, property); err != nil {
return err
}
}
return nil
}