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Kyaw Myint Thein
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Nov 3, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package rzluramartian | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
|
|
||
| "github.com/clbanning/mxj" | ||
| "github.com/google/martian/parse" | ||
| "golang.org/x/net/html/charset" | ||
| ) | ||
|
|
||
| const ( | ||
| _contentType_JSON = "json" | ||
| _contentType_XML = "xml" | ||
| ) | ||
|
|
||
| type ( | ||
| RequestBodyModifierConfig struct { | ||
| OriginalContentType string `json:"original_content_type"` | ||
| ExpectedContentType string `json:"expected_content_type"` | ||
| } | ||
|
|
||
| RequestBodyModifier struct { | ||
| originalContentType string | ||
| expectedContentType string | ||
| } | ||
| ) | ||
|
|
||
| func (m *RequestBodyModifier) ModifyRequest(req *http.Request) error { | ||
| if req.Body == nil { | ||
| return nil | ||
| } | ||
|
|
||
| var v map[string]interface{} | ||
| switch m.expectedContentType { | ||
| case _contentType_XML: | ||
| mxj.XmlCharsetReader = charset.NewReaderLabel | ||
| mv, err := mxj.NewMapXmlReader(xmlReader{r: req.Body}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| v = mv | ||
| default: | ||
| // Default is JSON | ||
| payloadBytes, err := ioutil.ReadAll(req.Body) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| req.Body.Close() | ||
| err = json.Unmarshal(payloadBytes, &v) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| switch m.originalContentType { | ||
| case _contentType_XML: | ||
| transformedDataBytes, err := mxj.AnyXml(v) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| req.Header.Del("Content-Type") | ||
| req.Header.Set("Content-Type", "application/xml") | ||
| req.ContentLength = int64(len(transformedDataBytes)) | ||
| req.Body = ioutil.NopCloser(bytes.NewReader(transformedDataBytes)) | ||
| default: | ||
| transformedDataBytes, err := json.Marshal(v) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| req.Header.Del("Content-Type") | ||
| req.Header.Set("Content-Type", "application/json") | ||
| req.ContentLength = int64(len(transformedDataBytes)) | ||
| req.Body = ioutil.NopCloser(bytes.NewReader(transformedDataBytes)) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| type xmlReader struct { | ||
| r io.Reader | ||
| } | ||
|
|
||
| func (x xmlReader) Read(p []byte) (n int, err error) { | ||
| n, err = x.r.Read(p) | ||
|
|
||
| if err != io.EOF { | ||
| return n, err | ||
| } | ||
|
|
||
| if len(p) == n { | ||
| return n, nil | ||
| } | ||
|
|
||
| p[n] = ([]byte("\n"))[0] | ||
| return n + 1, err | ||
| } | ||
|
|
||
| func requestTransformerFromJSON(b []byte) (*parse.Result, error) { | ||
| cfg := &RequestBodyModifierConfig{} | ||
| if err := json.Unmarshal(b, cfg); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| mod := &RequestBodyModifier{ | ||
| expectedContentType: cfg.ExpectedContentType, | ||
| originalContentType: cfg.OriginalContentType, | ||
| } | ||
| return parse.NewResult(mod, []parse.ModifierType{parse.Request}) | ||
| } |