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VarsCtr.go
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VarsCtr.go
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package gotten
import (
"bytes"
"fmt"
"github.com/Hexilee/gotten/headers"
"github.com/iancoleman/strcase"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"net/url"
"os"
"path/filepath"
"reflect"
"regexp"
"strconv"
"strings"
"unicode"
)
const (
PathKeyRegexp = `\{[a-zA-Z_][0-9a-zA-Z_]*\}`
ZeroStr = ""
// json Marshal nil
NullStr = "null"
ZeroInt = 0
)
var (
ZeroStringer fmt.Stringer = bytes.NewBufferString("")
ZeroReader io.Reader = bytes.NewBufferString("")
pathKeyRegexp, _ = regexp.Compile(PathKeyRegexp)
)
type (
VarsController interface {
setValues(value reflect.Value) error
getUrl() (*url.URL, error)
getBody() (io.Reader, error)
getHeader() http.Header
getContentType() string
getCookies() []*http.Cookie
}
VarsParser struct {
regex *regexp.Regexp
path string
pathKeys PathKeyList
contentType string
fieldTable []*Field
ioFieldTable []*IOField
}
VarsCtr struct {
regex *regexp.Regexp
path string
contentType string
fieldTable []*Field
ioFieldTable []*IOField
pathValues map[string]string
queryValues url.Values
formValues url.Values
multipartValues map[string]string
multipartFiles map[string]string
multipartReaders map[string]MultipartReader
header http.Header
cookies []*http.Cookie
body io.Reader
writer *multipart.Writer
}
// TypePath, TypeQuery, TypeForm, TypeHeader, TypeCookie, TypeMultipart(except io.Reader)
Field struct {
key string
name string
defaultValue string
valueType string
require bool
fieldType reflect.Type
// can only called by getValue
getValueFunc func(value reflect.Value) (string, error)
}
// TypeJSON, TypeXML, TypeMultipart(io.Reader)
IOField struct {
key string
name string
defaultValue string
valueType string
require bool
// can only called by getValue
getReaderFunc func(value reflect.Value) (Reader, error)
}
MultipartReader struct {
reader io.Reader
header http.Header
}
PathKeyList map[string]bool
)
func newVarsParser(path string) (*VarsParser, error) {
// fieldTable and ioFieldTables will be made after num of fields is known
pathKeys, err := getPathKeys(pathKeyRegexp, path)
return &VarsParser{
regex: pathKeyRegexp,
path: path,
pathKeys: pathKeys,
}, err
}
func getPathKeys(regex *regexp.Regexp, path string) (pathKeys PathKeyList, err error) {
pathKeys = make(PathKeyList)
patterns := regex.FindAllString(path, -1)
for _, pattern := range patterns {
key := getKeyFromPattern(pattern)
if !pathKeys.addKey(key) {
err = DuplicatedPathKeyError(key)
break
}
}
return
}
func (field Field) getValue(value reflect.Value) (val string, err error) {
val, err = field.getValueFunc(value)
if err == nil && val == ZeroStr {
val = field.defaultValue
if !field.hasDefaultValue() && field.require {
err = EmptyRequiredVariableError(field.name)
}
}
return
}
func (field IOField) getValue(value reflect.Value) (val Reader, err error) {
val, err = field.getReaderFunc(value)
if err == nil && val.Empty() {
val = newReadCloser(bytes.NewBufferString(field.defaultValue), !field.hasDefaultValue())
if val.Empty() && field.require {
err = EmptyRequiredVariableError(field.name)
}
}
return
}
func (field Field) hasDefaultValue() bool {
return field.defaultValue != ZeroStr
}
func (field IOField) hasDefaultValue() bool {
return field.defaultValue != ZeroStr
}
func (list PathKeyList) addKey(key string) (added bool) {
if _, ok := list[key]; !ok {
list[key] = true
added = true
}
return
}
func (list PathKeyList) deleteKey(key string) (exist bool) {
if _, ok := list[key]; ok {
delete(list, key)
exist = true
}
return
}
func (list PathKeyList) empty() bool {
return len(list) == 0
}
// can only be called by parse
func (parser *VarsParser) addField(index int, valueType string, field reflect.StructField) (err error) {
fieldType := field.Type
fieldTag := field.Tag
key := processKey(fieldTag.Get(KeyKey), valueType, field.Name)
defaultValue := fieldTag.Get(KeyDefault)
require, parseErr := processRequired(fieldTag.Get(KeyRequire))
if err = parseErr; err == nil {
parser.fieldTable[index] = &Field{
key: key,
name: field.Name,
defaultValue: defaultValue,
valueType: valueType,
fieldType: fieldType,
require: require,
}
switch valueType {
case TypePath:
if exist := parser.pathKeys.deleteKey(key); !exist {
err = UnrecognizedPathKeyError(key)
break
}
parser.fieldTable[index].require = true // path is always required
fallthrough
case TypeQuery:
fallthrough
case TypeCookie:
fallthrough
case TypeHeader:
fallthrough
case TypeForm:
parser.fieldTable[index].getValueFunc, err = getValueGetterFunc(fieldType, TypePath)
case TypeMultipart:
parser.fieldTable[index].getValueFunc, err = getMultipartValueGetterFunc(fieldType, TypePath)
//default:
// never occur
}
}
return
}
// can only be called by parse
func (parser *VarsParser) addIOField(index int, valueType string, field reflect.StructField) (err error) {
fieldType := field.Type
fieldTag := field.Tag
key := processKey(fieldTag.Get(KeyKey), valueType, field.Name)
defaultValue := fieldTag.Get(KeyDefault)
require, parseErr := processRequired(fieldTag.Get(KeyRequire))
if err = parseErr; err == nil {
parser.ioFieldTable[index] = &IOField{
key: key,
name: field.Name,
defaultValue: defaultValue,
valueType: valueType,
require: require,
}
switch valueType {
case TypeJSON:
parser.ioFieldTable[index].getReaderFunc, err = getJSONReaderGetterFunc(fieldType, valueType)
case TypeXML:
parser.ioFieldTable[index].getReaderFunc, err = getXMLReaderGetterFunc(fieldType, valueType)
case TypeMultipart:
parser.ioFieldTable[index].getReaderFunc = getReaderFromReader
//default:
// never occur
}
}
return
}
func (parser *VarsParser) parse(paramType reflect.Type) (err error) {
if paramType.Kind() != reflect.Ptr || paramType.Elem().Kind() != reflect.Struct {
err = ParamTypeMustBePtrOfStructError(paramType)
}
if err == nil {
paramElem := paramType.Elem()
parser.fieldTable = make([]*Field, paramElem.NumField())
parser.ioFieldTable = make([]*IOField, paramElem.NumField())
for i := 0; i < paramElem.NumField(); i++ {
field := paramElem.Field(i)
if fieldExportable(field.Name) {
valueType := field.Tag.Get(KeyType)
switch valueType {
case TypePath:
fallthrough
case TypeQuery:
fallthrough
case TypeCookie:
fallthrough
case TypeHeader:
err = parser.addField(i, valueType, field)
case TypeForm:
err = parser.checkContentType(headers.MIMEApplicationForm)
if err == nil {
err = parser.addField(i, valueType, field)
}
case TypeJSON:
err = parser.checkContentType(headers.MIMEApplicationJSONCharsetUTF8)
if err == nil {
err = parser.addIOField(i, valueType, field)
}
case TypeXML:
err = parser.checkContentType(headers.MIMEApplicationXMLCharsetUTF8)
if err == nil {
err = parser.addIOField(i, valueType, field)
}
case TypeMultipart:
err = parser.checkContentType(headers.MIMEMultipartForm)
if err == nil {
if field.Type == ReaderType {
err = parser.addIOField(i, valueType, field)
} else {
err = parser.addField(i, valueType, field)
}
}
default:
err = UnsupportedValueTypeError(valueType)
}
if err != nil {
break
}
}
}
if err == nil && !parser.pathKeys.empty() {
err = SomePathVarHasNoValueError(parser.pathKeys)
}
}
return
}
// can only be called by checkContentType
func (parser *VarsParser) setContentType(contentType string) {
parser.contentType = contentType
}
// can only be called by parse()
func (parser *VarsParser) checkContentType(contentType string) (err error) {
switch contentType {
case headers.MIMEMultipartForm:
switch parser.contentType {
case headers.MIMEApplicationForm:
err = ContentTypeConflictError(parser.contentType, contentType)
case ZeroStr:
fallthrough
case headers.MIMEApplicationJSONCharsetUTF8:
fallthrough
case headers.MIMEApplicationXMLCharsetUTF8:
parser.setContentType(contentType)
case headers.MIMEMultipartForm:
default:
panic("Unsupported content type of parser: " + parser.contentType)
}
case headers.MIMEApplicationForm:
switch parser.contentType {
case headers.MIMEMultipartForm:
err = ContentTypeConflictError(parser.contentType, contentType)
case ZeroStr:
fallthrough
case headers.MIMEApplicationJSONCharsetUTF8:
fallthrough
case headers.MIMEApplicationXMLCharsetUTF8:
parser.setContentType(contentType)
case headers.MIMEApplicationForm:
default:
panic("Unsupported content type of parser: " + parser.contentType)
}
case headers.MIMEApplicationJSONCharsetUTF8:
fallthrough
case headers.MIMEApplicationXMLCharsetUTF8:
switch parser.contentType {
case headers.MIMEApplicationXMLCharsetUTF8:
fallthrough
case headers.MIMEApplicationJSONCharsetUTF8:
err = ContentTypeConflictError(parser.contentType, contentType)
case ZeroStr:
parser.setContentType(contentType)
case headers.MIMEApplicationForm:
case headers.MIMEMultipartForm:
default:
panic("Unsupported content type of parser: " + parser.contentType)
}
default:
panic("Unsupported content type: " + contentType)
}
return
}
func (parser *VarsParser) Build() VarsController {
varsCtr := &VarsCtr{
regex: parser.regex,
path: parser.path,
contentType: parser.contentType,
fieldTable: parser.fieldTable,
ioFieldTable: parser.ioFieldTable,
pathValues: make(map[string]string),
queryValues: make(url.Values),
header: make(http.Header),
}
if varsCtr.contentType != ZeroStr {
body := bytes.NewBuffer(make([]byte, 0))
varsCtr.body = body
if varsCtr.contentType == headers.MIMEMultipartForm {
varsCtr.multipartValues = make(map[string]string)
varsCtr.multipartReaders = make(map[string]MultipartReader)
varsCtr.multipartFiles = make(map[string]string)
varsCtr.writer = multipart.NewWriter(body)
}
if varsCtr.contentType == headers.MIMEApplicationForm {
varsCtr.formValues = make(url.Values)
}
}
return varsCtr
}
func (varsCtr VarsCtr) getUrl() (result *url.URL, err error) {
path := varsCtr.genPath()
result, err = url.Parse(path)
if err == nil {
query := varsCtr.queryValues.Encode()
result.RawQuery = query
}
return
}
func (varsCtr VarsCtr) getCookies() []*http.Cookie {
return varsCtr.cookies
}
func (varsCtr VarsCtr) getContentType() (contentType string) {
if varsCtr.contentType == headers.MIMEMultipartForm {
contentType = varsCtr.writer.FormDataContentType()
} else {
contentType = varsCtr.contentType
}
return
}
func (varsCtr VarsCtr) getHeader() http.Header {
return varsCtr.header
}
func (varsCtr VarsCtr) getBody() (body io.Reader, err error) {
switch varsCtr.contentType {
case headers.MIMEApplicationForm:
body = bytes.NewBufferString(varsCtr.formValues.Encode())
case headers.MIMEMultipartForm:
err = varsCtr.resolveMultipartBody()
fallthrough
case headers.MIMEApplicationXMLCharsetUTF8:
fallthrough
case headers.MIMEApplicationJSONCharsetUTF8:
body = varsCtr.body
}
return
}
func (varsCtr VarsCtr) resolveMultipartBody() (err error) {
var partWriter io.Writer
writer := varsCtr.writer
for key, val := range varsCtr.multipartValues {
writer.WriteField(key, val)
}
for key, reader := range varsCtr.multipartReaders {
if partWriter, err = writer.CreateFormField(key); err == nil {
_, err = io.Copy(partWriter, reader.reader)
}
if x, ok := reader.reader.(io.Closer); ok {
x.Close()
}
if err != nil {
break
}
}
for key, path := range varsCtr.multipartFiles {
var file *os.File
file, err = os.Open(path)
if err == nil {
if partWriter, err = writer.CreateFormFile(key, filepath.Base(file.Name())); err == nil {
_, err = io.Copy(partWriter, file)
}
}
file.Close() // close
if err != nil {
break
}
}
writer.Close()
return
}
func (varsCtr *VarsCtr) setValuesByFields(value reflect.Value) (err error) {
for i, field := range varsCtr.fieldTable {
if field != nil {
fieldValue := value.Field(i)
var val string
switch field.valueType {
case TypePath:
varsCtr.pathValues[field.key], err = field.getValue(fieldValue)
case TypeQuery:
val, err = field.getValue(fieldValue)
if err == nil {
varsCtr.queryValues.Add(field.key, val)
}
case TypeHeader:
val, err = field.getValue(fieldValue)
if err == nil {
varsCtr.header.Add(field.key, val)
}
case TypeCookie:
val, err = field.getValue(fieldValue)
if err == nil {
varsCtr.cookies = append(varsCtr.cookies, &http.Cookie{Name: field.key, Value: val})
}
case TypeForm:
val, err = field.getValue(fieldValue)
if err == nil {
varsCtr.formValues.Add(field.key, val)
}
case TypeMultipart:
val, err = field.getValue(fieldValue)
if field.fieldType == FilePathType {
varsCtr.multipartFiles[field.key] = val
} else {
varsCtr.multipartValues[field.key] = val
}
//default:
// never occur
//panic(UnsupportedValueTypeError(field.valueType))
}
if err != nil {
break
}
}
}
return
}
func (varsCtr *VarsCtr) setValuesByIOFields(value reflect.Value) (err error) {
for i, field := range varsCtr.ioFieldTable {
if field != nil {
fieldValue := value.Field(i)
var reader Reader
switch field.valueType {
case TypeJSON:
switch varsCtr.contentType {
case headers.MIMEApplicationJSONCharsetUTF8:
reader, err = field.getValue(fieldValue)
varsCtr.body = reader
case headers.MIMEApplicationForm:
var data []byte
reader, err = field.getValue(fieldValue)
if err == nil && !reader.Empty() {
data, err = ioutil.ReadAll(reader)
varsCtr.formValues.Add(field.key, string(data))
}
case headers.MIMEMultipartForm:
header := make(http.Header)
header.Add(headers.HeaderContentType, headers.MIMEApplicationJavaScriptCharsetUTF8)
reader, err = field.getValue(fieldValue)
varsCtr.multipartReaders[field.key] = MultipartReader{reader, header}
//default:
// never occur
//panic("Unsupported content type: " + varsCtr.contentType)
}
case TypeXML:
switch varsCtr.contentType {
case headers.MIMEApplicationXMLCharsetUTF8:
reader, err = field.getValue(fieldValue)
varsCtr.body = reader
case headers.MIMEApplicationForm:
var data []byte
reader, err = field.getValue(fieldValue)
if err == nil && !reader.Empty() {
data, err = ioutil.ReadAll(reader)
varsCtr.formValues.Add(field.key, string(data))
}
case headers.MIMEMultipartForm:
header := make(http.Header)
header.Add(headers.HeaderContentType, headers.MIMEApplicationXMLCharsetUTF8)
reader, err = field.getValue(fieldValue)
varsCtr.multipartReaders[field.key] = MultipartReader{reader, header}
//default:
// never occur
//panic("Unsupported content type: " + varsCtr.contentType)
}
case TypeMultipart:
switch varsCtr.contentType {
case headers.MIMEMultipartForm:
header := make(http.Header)
header.Add(headers.HeaderContentType, headers.MIMEOctetStream)
reader, err = field.getValue(fieldValue)
varsCtr.multipartReaders[field.key] = MultipartReader{reader, header}
//default:
// never occur
//panic("Unsupported content type: " + varsCtr.contentType)
}
//default:
// never occur
//panic(UnsupportedValueTypeError(field.valueType))
}
if err != nil {
break
}
}
}
return
}
func (varsCtr *VarsCtr) setValues(ptr reflect.Value) (err error) {
value := ptr.Elem()
err = varsCtr.setValuesByFields(value)
if err == nil {
err = varsCtr.setValuesByIOFields(value)
}
return
}
// str: {key}
func (varsCtr VarsCtr) findAndReplace(pattern string) string {
key := getKeyFromPattern(pattern)
return varsCtr.pathValues[key]
}
func (varsCtr VarsCtr) genPath() string {
return varsCtr.regex.ReplaceAllStringFunc(varsCtr.path, varsCtr.findAndReplace)
}
func getKeyFromPattern(pattern string) string {
return strings.TrimRight(strings.TrimLeft(pattern, "{"), "}")
}
func processKey(rawKey, valueType, fieldName string) (key string) {
key = rawKey
if key == ZeroStr {
switch valueType {
case TypePath:
fallthrough
case TypeQuery:
fallthrough
case TypeMultipart:
fallthrough
case TypeJSON:
fallthrough
case TypeXML:
fallthrough
case TypeForm:
fallthrough
case TypeCookie:
key = strcase.ToSnake(fieldName)
case TypeHeader:
key = strcase.ToScreamingKebab(fieldName)
default:
panic("Unsupported valueType: " + valueType)
}
}
return
}
func processRequired(raw string) (required bool, err error) {
if raw != ZeroStr {
required, err = strconv.ParseBool(raw)
}
return
}
func fieldExportable(fieldName string) bool {
return unicode.IsUpper(bytes.Runes([]byte{fieldName[0]})[0])
}