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formextractor.go
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formextractor.go
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package core
import (
"mime/multipart"
)
type FormExtractor struct {
Runtime *DirectiveRuntime
multipart.Form
KeyNormalizer func(string) string
}
func (e *FormExtractor) Extract(keys ...string) error {
if len(keys) == 0 {
keys = e.Runtime.Directive.Argv
}
for _, key := range keys {
if e.KeyNormalizer != nil {
key = e.KeyNormalizer(key)
}
if err := e.extract(key); err != nil {
return err
}
}
return nil
}
func (e *FormExtractor) extract(key string) error {
if e.Runtime.IsFieldSet() {
return nil // skip when already extracted by former directives
}
values := e.Form.Value[key]
files := e.Form.File[key]
// Quick fail on empty input.
if len(values) == 0 && len(files) == 0 {
return nil
}
var sourceValue any
var err error
valueType := e.Runtime.Value.Type().Elem()
if isFileType(valueType) {
// When fileDecoder is not nil, it means that the field is a file upload.
// We should decode files instead of values.
if len(files) == 0 {
return nil // skip when no file uploaded
}
sourceValue = files
var decoder FileSlicable
decoder, err = NewFileSlicable(e.Runtime.Value.Elem())
if err == nil {
err = decoder.FromFileSlice(toFileHeaderList(files))
}
} else {
if len(values) == 0 {
return nil // skip when no value given
}
sourceValue = values
var adapt AnyStringableAdaptor
decoderInfo := e.Runtime.GetCustomCoder() // custom decoder, specified by "decoder" directive
if decoderInfo != nil {
adapt = decoderInfo.Adapt
}
var decoder StringSlicable
decoder, err = NewStringSlicable(e.Runtime.Value.Elem(), adapt)
if err == nil {
err = decoder.FromStringSlice(values)
}
}
if err != nil {
return &fieldError{key, sourceValue, err}
}
e.Runtime.MarkFieldSet(true)
return nil
}