/
parameter_builder.go
205 lines (172 loc) · 4.79 KB
/
parameter_builder.go
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package sdk
import (
"errors"
"fmt"
urllib "net/url"
"reflect"
"regexp"
"strings"
"github.com/marmotedu/component-base/pkg/json"
"github.com/marmotedu/medu-sdk-go/sdk/log"
"github.com/marmotedu/medu-sdk-go/sdk/request"
)
var baseRequestFields []string
func init() {
req := request.BaseRequest{}
reqType := reflect.TypeOf(req)
for i := 0; i < reqType.NumField(); i++ {
baseRequestFields = append(baseRequestFields, reqType.Field(i).Name)
}
}
type ParameterBuilder interface {
BuildURL(url string, paramJson []byte) (string, error)
BuildBody(paramJson []byte) (string, error)
}
func GetParameterBuilder(method string, logger log.Logger) ParameterBuilder {
if method == MethodGet || method == MethodDelete || method == MethodHead {
return &WithoutBodyBuilder{logger}
} else {
return &WithBodyBuilder{logger}
}
}
// WithBodyBuilder supports PUT/POST/PATCH methods.
// It has path and body (json) parameters, but no query parameters.
type WithBodyBuilder struct {
Logger log.Logger
}
func (b WithBodyBuilder) BuildURL(url string, paramJson []byte) (string, error) {
paramMap := make(map[string]interface{})
err := json.Unmarshal(paramJson, ¶mMap)
if err != nil {
b.Logger.Errorf("%s", err.Error())
return "", err
}
replacedUrl, err := replaceUrlWithPathParam(url, paramMap)
if err != nil {
b.Logger.Errorf("%s", err.Error())
return "", err
}
encodedUrl, err := encodeUrl(replacedUrl, nil)
if err != nil {
return "", err
}
b.Logger.Infof("URL=%s", encodedUrl)
return encodedUrl, nil
}
func (b WithBodyBuilder) BuildBody(paramJson []byte) (string, error) {
paramMap := make(map[string]interface{})
err := json.Unmarshal(paramJson, ¶mMap)
if err != nil {
b.Logger.Errorf("%s", err.Error())
return "", err
}
// remove base request fields
for k := range paramMap {
if includes(baseRequestFields, k) {
delete(paramMap, k)
}
}
body, _ := json.Marshal(paramMap)
b.Logger.Infof("Body=%s", string(body))
return string(body), nil
}
// WithoutBodyBuilder supports GET/DELETE methods.
// It only builds path and query parameters.
type WithoutBodyBuilder struct {
Logger log.Logger
}
func (b WithoutBodyBuilder) BuildURL(url string, paramJson []byte) (string, error) {
paramMap := make(map[string]interface{})
err := json.Unmarshal(paramJson, ¶mMap)
if err != nil {
b.Logger.Errorf("%s", err.Error())
return "", err
}
resultUrl, err := replaceUrlWithPathParam(url, paramMap)
if err != nil {
b.Logger.Errorf("%s", err.Error())
return "", err
}
queryParams := buildQueryParams(paramMap, url)
encodedUrl, err := encodeUrl(resultUrl, queryParams)
if err != nil {
return "", err
}
b.Logger.Infof("%s", string(paramJson))
b.Logger.Infof("URL=%s", encodedUrl)
return encodedUrl, nil
}
func (b WithoutBodyBuilder) BuildBody(paramJson []byte) (string, error) {
return "", nil
}
func replaceUrlWithPathParam(url string, paramMap map[string]interface{}) (string, error) {
r, _ := regexp.Compile("{[a-zA-Z0-9-_]+}")
matches := r.FindAllString(url, -1)
for _, match := range matches {
field := strings.TrimLeft(match, "{")
field = strings.TrimRight(field, "}")
value, ok := paramMap[field]
if !ok {
return "", errors.New("Can not find path parameter: " + field)
}
valueStr := fmt.Sprintf("%v", value)
url = strings.Replace(url, match, valueStr, -1)
}
return url, nil
}
func buildQueryParams(paramMap map[string]interface{}, url string) urllib.Values {
values := urllib.Values{}
accessMap(paramMap, url, "", values)
return values
}
func accessMap(paramMap map[string]interface{}, url, prefix string, values urllib.Values) {
for k, v := range paramMap {
// exclude fields of Client class and path parameters
if shouldIgnoreField(url, k) {
continue
}
switch e := v.(type) {
case []interface{}:
for i, n := range e {
switch f := n.(type) {
case map[string]interface{}:
subPrefix := fmt.Sprintf("%s.%d.", k, i+1)
accessMap(f, url, subPrefix, values)
case nil:
default:
values.Set(fmt.Sprintf("%s%s.%d", prefix, k, i+1), fmt.Sprintf("%s", n))
}
}
case nil:
default:
values.Set(fmt.Sprintf("%s%s", prefix, k), fmt.Sprintf("%v", v))
}
}
}
func shouldIgnoreField(url, field string) bool {
flag := "{" + field + "}"
if strings.Contains(url, flag) {
return true
}
if includes(baseRequestFields, field) {
return true
}
return false
}
func encodeUrl(requestUrl string, values urllib.Values) (string, error) {
urlObj, err := urllib.Parse(requestUrl)
if err != nil {
return "", err
}
urlObj.RawPath = EscapePath(urlObj.Path, false)
uri := urlObj.EscapedPath()
if values != nil {
queryParam := values.Encode()
// RFC 3986, ' ' should be encoded to 20%, '+' to 2B%
queryParam = strings.Replace(queryParam, "+", "%20", -1)
if queryParam != "" {
uri += "?" + queryParam
}
}
return uri, nil
}