[to #1] support Nextcloud IOS

handlers/proxy/proxy.go

@@ -0,0 +1,88 @@
+package proxy
+
+import (
+	"net/http"
+	"net/http/httputil"
+	"io/ioutil"
+	"fmt"
+	"strings"
+	"bytes"
+	"io"
+)
+
+type Handler struct {
+
+}
+
+func copyHeader(dst, src http.Header) {
+    for k, vv := range src {
+        for _, v := range vv {
+            dst.Add(k, v)
+        }
+    }
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+    // we need to buffer the body if we want to read it here and send it
+    // in the request. 
+    body, err := ioutil.ReadAll(r.Body)
+    if err != nil {
+        http.Error(w, err.Error(), http.StatusInternalServerError)
+        return
+    }
+	fmt.Println("request body--start")
+	fmt.Println(string(body))
+	fmt.Println("request body--stop")
+
+    // you can reassign the body if you need to parse it as multipart
+    r.Body = ioutil.NopCloser(bytes.NewReader(body))
+
+    // create a new url from the raw RequestURI sent by the client
+    url := fmt.Sprintf("%s://%s%s", "http", r.Host, r.RequestURI)
+	fmt.Println("-----Request-----", r.RequestURI)
+	fmt.Println(r.Method, url)
+
+    proxyReq, err := http.NewRequest(r.Method, url, bytes.NewReader(body))
+
+    // We may want to filter some headers, otherwise we could just use a shallow copy
+    // proxyReq.Header = r.Header
+    proxyReq.Header = make(http.Header)
+    for h, val := range r.Header {
+		tmp := []string{}
+		for _, v := range val{
+			if h == "Accept-Encoding" && strings.Contains(v, "gzip") {
+				continue
+			}
+			tmp = append(tmp, v)
+		}
+		proxyReq.Header[h] = tmp
+		fmt.Println(h, ":", tmp)
+    }
+
+	httpClient := &http.Client{
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+    resp, err := httpClient.Do(proxyReq)
+    if err != nil {
+        http.Error(w, err.Error(), http.StatusBadGateway)
+        return
+    }
+
+	copyHeader(w.Header(), resp.Header)
+    w.WriteHeader(resp.StatusCode)
+
+	responseData, err := httputil.DumpResponse(resp, true)
+    if err != nil {
+        fmt.Println("err", err)
+    }
+    responseString := string(responseData)
+	fmt.Println("-----Response-----", r.RequestURI)
+    fmt.Println(responseString)
+
+	io.Copy(w, resp.Body)
+
+    defer resp.Body.Close()
+    // legacy code
+}