152 lines
3.1 KiB
Go
152 lines
3.1 KiB
Go
package gfw
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"strings"
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"time"
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)
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// buildRequest builds an interface request
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// from a http.Request
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func buildRequest(req *http.Request) (*Request, error) {
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/* (1) Init request */
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uri := NormaliseUri(req.URL.Path)
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inst := &Request{
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Uri: strings.Split(uri, "/"),
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GetData: FetchGetData(req),
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FormData: FetchFormData(req),
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UrlData: make(map[int]interface{}, 0),
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Data: make(map[string]interface{}, 0),
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}
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inst.ControllerUri = make([]string, 0, len(inst.Uri))
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/* (2) Fill 'Data' with GET data */
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for name, data := range inst.GetData {
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// prevent injections
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if isParameterNameInjection(name) {
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log.Printf("get.name_injection: '%s'\n", name)
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delete(inst.GetData, name)
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continue
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}
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// add into data
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inst.Data[fmt.Sprintf("GET@%s", name)] = data
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}
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/* (3) Fill 'Data' with POST data */
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for name, data := range inst.FormData {
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// prevent injections
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if isParameterNameInjection(name) {
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log.Printf("post.name_injection: '%s'\n", name)
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delete(inst.FormData, name)
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continue
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}
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// add into data
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inst.Data[name] = data
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}
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return inst, nil
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}
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// NormaliseUri removes the trailing '/' to always
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// have the same Uri format for later processing
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func NormaliseUri(uri string) string {
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if len(uri) < 1 {
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return uri
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}
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if uri[0] == '/' {
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uri = uri[1:]
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}
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if uri[len(uri)-1] == '/' {
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uri = uri[0 : len(uri)-1]
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}
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return uri
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}
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// FetchGetData extracts the GET data
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// from an HTTP request
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func FetchGetData(req *http.Request) map[string]interface{} {
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res := make(map[string]interface{})
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for name, value := range req.URL.Query() {
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res[name] = value
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}
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return res
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}
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// FetchFormData extracts FORM data
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//
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// - parse 'form-data' if not supported (not POST requests)
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// - parse 'x-www-form-urlencoded'
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// - parse 'application/json'
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func FetchFormData(req *http.Request) map[string]interface{} {
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res := make(map[string]interface{})
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ct := req.Header.Get("Content-Type")
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if strings.HasPrefix(ct, "application/json") {
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receiver := make(map[string]interface{}, 0)
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// 1. Init JSON reader
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decoder := json.NewDecoder(req.Body)
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if err := decoder.Decode(&receiver); err != nil {
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log.Printf("[parse.json] %s\n", err)
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return res
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}
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// 2. Return result
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return receiver
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} else if strings.HasPrefix(ct, "application/x-www-form-urlencoded") {
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// 1. Parse url encoded data
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req.ParseForm()
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// 2. Extract values
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for name, value := range req.PostForm {
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res[name] = value
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}
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} else { // form-data or anything
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startn := time.Now().UnixNano()
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// 1. Parse form-data
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if err := req.ParseMultipartForm(req.ContentLength + 1); err != nil {
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log.Printf("[read.multipart] %s\n", err)
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return res
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}
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// 2. Extract values
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for name, value := range req.PostForm {
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res[name] = value
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}
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fmt.Printf("* %.3f us\n", float64(time.Now().UnixNano()-startn)/1e3)
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}
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return res
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}
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// isParameterNameInjection returns whether there is
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// a parameter name injection:
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// - inferred GET parameters
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// - inferred URL parameters
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func isParameterNameInjection(pName string) bool {
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return strings.HasPrefix(pName, "GET@") || strings.HasPrefix(pName, "URL#")
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}
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