/
tag.go
135 lines (115 loc) · 2.67 KB
/
tag.go
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package hyperdrive
import (
"reflect"
"strings"
"github.com/xtgo/set"
)
const (
tagName = "param"
)
type parsedParam struct {
Name string
Desc string
Field string
Type string
Key string
Allowed []string
Required []string
}
func (p parsedParam) IsAllowed(method string) bool {
return contains(p.Allowed, method)
}
func (p parsedParam) AllowedList() string {
return strings.Join(p.Allowed, ",")
}
func (p parsedParam) IsRequired(method string) bool {
return contains(p.Required, method)
}
func (p parsedParam) RequiredList() string {
return strings.Join(p.Required, ",")
}
type parsedParams map[string]parsedParam
func (pp parsedParams) Allowed(method string) []string {
var allowed []string
for _, p := range pp {
if p.IsAllowed(method) {
allowed = append(allowed, p.Key)
}
}
return allowed
}
func (pp parsedParams) Required(method string) []string {
var required []string
for _, p := range pp {
if p.IsRequired(method) {
required = append(required, p.Key)
}
}
return required
}
func contains(haystack []string, needle string) bool {
for _, m := range haystack {
if m == needle {
return true
}
}
return false
}
func parseEndpoint(e Endpointer) parsedParams {
var params = parsedParams{}
t := reflect.TypeOf(e).Elem()
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if _, ok := field.Tag.Lookup(tagName); ok {
parsed := parseField(field)
params[parsed.Key] = parsed
}
}
return params
}
func parseField(field reflect.StructField) parsedParam {
var (
key string
tags []string
allowed = []string{"GET", "POST", "PUT", "PATCH"}
required = []string{}
)
t := field.Tag.Get(tagName)
tags = strings.Split(t, ";")
key, tags = tags[0], tags[1:]
if key == "" {
key = field.Name
}
for _, tag := range tags {
pairs := strings.Split(tag, "=")
k, v := pairs[0], pairs[1]
switch k {
case "a":
if v != "" {
allowed = strings.Split(v, ",")
}
case "r":
if v != "" {
required = strings.Split(v, ",")
allowed = set.Strings(allowed)
}
}
}
required = set.Strings(required)
allowed = append(allowed, required...)
allowed = set.Strings(allowed)
name, desc := fieldNameAndDesc(field)
return parsedParam{name, desc, field.Name, field.Type.Name(), key, allowed, required}
}
func fieldNameAndDesc(field reflect.StructField) (string, string) {
var name = field.Name
var desc = "..."
in := []reflect.Value{reflect.New(field.Type)}
if gname, ok := reflect.PtrTo(field.Type).MethodByName("GetName"); ok {
name = gname.Func.Call(in)[0].String()
}
if gdesc, ok := reflect.PtrTo(field.Type).MethodByName("GetDesc"); ok {
desc = gdesc.Func.Call(in)[0].String()
}
return name, desc
}