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util.go
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util.go
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package colibri
import (
"errors"
"net/http"
"net/url"
"reflect"
"strings"
"time"
)
var (
// ErrInvalidHeader is returned when the value is an invalid header.
ErrInvalidHeader = errors.New("invalid header")
// ErrMustBeString is returned when the value is not a string.
ErrMustBeString = errors.New("must be a string")
// ErrMustBeNumber is returned when the value is not a number.
ErrMustBeNumber = errors.New("must be a number")
// ErrNotAssignable is returned when the value is not assignable to the field.
ErrNotAssignable = errors.New("value is not assignable to field")
)
var (
intType = reflect.TypeOf(int(0))
urlType = reflect.TypeOf((*url.URL)(nil))
headerType = reflect.TypeOf(http.Header{})
durationType = reflect.TypeOf(time.Duration(0))
selectorsType = reflect.TypeOf([]*Selector{})
)
func processRaw[T Rules | Selector](raw map[string]any, output *T) error {
if raw == nil {
return nil
}
var (
rOutput = reflect.ValueOf(output).Elem()
err error
errs error
)
for key, value := range raw {
field := rOutput.FieldByNameFunc(func(s string) bool {
return strings.EqualFold(key, s)
})
if field.IsValid() && field.CanSet() {
fieldType := field.Type()
switch fieldType {
case intType:
value, err = toInt(value)
case urlType:
value, err = ToURL(value)
case headerType:
value, err = toHeader(value)
case durationType:
value, err = toDuration(value)
case selectorsType:
value, err = newSelectors(value)
}
if err != nil {
errs = AddError(errs, key, err)
continue
}
rValue := reflect.ValueOf(value)
if !rValue.Type().AssignableTo(fieldType) {
errs = AddError(errs, key, ErrNotAssignable)
continue
}
field.Set(rValue)
delete(raw, key)
}
}
return errs
}
// ToURL converts a value to a *url.URL.
func ToURL(value any) (*url.URL, error) {
rawURL, ok := value.(string)
if ok {
return url.Parse(rawURL)
}
return nil, ErrMustBeString
}
func toInt(value any) (int, error) {
switch n := value.(type) {
case int:
return n, nil
case float64:
return int(n), nil
}
return 0, ErrMustBeNumber
}
func toHeader(value any) (http.Header, error) {
header := http.Header{}
if value == nil {
return header, nil
}
headerMap, ok := value.(map[string]any)
if !ok {
return header, ErrInvalidHeader
}
for k, v := range headerMap {
switch val := v.(type) {
case string:
header.Add(k, val)
case []any:
for _, e := range val {
s, ok := e.(string)
if !ok {
return header, ErrInvalidHeader
}
header.Add(k, s)
}
default:
return header, ErrInvalidHeader
}
}
return header, nil
}
func toDuration(value any) (time.Duration, error) {
switch d := value.(type) {
case int:
return time.Duration(d) * time.Millisecond, nil
case float64:
return time.Duration(d*1000000) * time.Nanosecond, nil
}
return 0, ErrMustBeNumber
}