/
wshttp.go
83 lines (71 loc) · 1.94 KB
/
wshttp.go
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package appservice
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"net/http"
"net/url"
)
const WebsocketCommandHTTPProxy = "http_proxy"
type HTTPProxyRequest struct {
Method string `json:"method"`
Path string `json:"path"`
Query string `json:"query"`
Headers http.Header `json:"headers"`
Body json.RawMessage `json:"body"`
}
type HTTPProxyResponse struct {
Status int `json:"status"`
Headers http.Header `json:"headers"`
Body json.RawMessage `json:"body"`
bodyBuf bytes.Buffer
}
func (p *HTTPProxyResponse) Header() http.Header {
return p.Headers
}
func (p *HTTPProxyResponse) Write(bytes []byte) (int, error) {
if p.Status == 0 {
p.Status = http.StatusOK
}
return p.bodyBuf.Write(bytes)
}
func (p *HTTPProxyResponse) WriteHeader(statusCode int) {
p.Status = statusCode
}
func (as *AppService) WebsocketHTTPProxy(cmd WebsocketCommand) (bool, interface{}) {
var req HTTPProxyRequest
if err := json.Unmarshal(cmd.Data, &req); err != nil {
return false, fmt.Errorf("failed to parse proxy request: %w", err)
}
if cmd.Ctx == nil {
cmd.Ctx = context.Background()
}
reqURL := (&url.URL{
Scheme: "http",
Host: "localhost",
Path: req.Path,
RawQuery: req.Query,
}).String()
httpReq, err := http.NewRequestWithContext(cmd.Ctx, req.Method, reqURL, bytes.NewReader(req.Body))
if err != nil {
return false, fmt.Errorf("failed to create fake HTTP request: %w", err)
}
httpReq.Header = req.Headers
var resp HTTPProxyResponse
resp.Headers = make(http.Header)
as.Router.ServeHTTP(&resp, httpReq)
if resp.bodyBuf.Len() > 0 {
bodyData := resp.bodyBuf.Bytes()
if json.Valid(bodyData) {
resp.Body = bodyData
} else {
resp.Body = make([]byte, 2+base64.RawStdEncoding.EncodedLen(len(bodyData)))
resp.Body[0] = '"'
base64.RawStdEncoding.Encode(resp.Body[1:], bodyData)
resp.Body[len(resp.Body)-1] = '"'
}
}
return true, &resp
}