feat(osi): 实现 OSI JSON 传输层（T-003）

2026-07-06 22:23:01 +08:00
parent 4a5134093b
commit 56acc01d92
8 changed files with 220 additions and 10 deletions
@@ -0,0 +1,113 @@
+package osi
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"golang.org/x/net/proxy"
+)
+
+type TransportConfig struct {
+	Timeout     time.Duration
+	Socks5Proxy string
+}
+
+type Transport struct {
+	client *http.Client
+}
+
+func NewTransport(config TransportConfig) (*Transport, error) {
+	timeout := config.Timeout
+	if timeout <= 0 {
+		timeout = 20 * time.Second
+	}
+
+	roundTripper := http.DefaultTransport.(*http.Transport).Clone()
+	if strings.TrimSpace(config.Socks5Proxy) != "" {
+		dialer, err := socks5Dialer(config.Socks5Proxy)
+		if err != nil {
+			return nil, err
+		}
+		roundTripper.DialContext = func(ctx context.Context, network, address string) (net.Conn, error) {
+			if contextDialer, ok := dialer.(proxy.ContextDialer); ok {
+				return contextDialer.DialContext(ctx, network, address)
+			}
+			return dialer.Dial(network, address)
+		}
+	}
+
+	return &Transport{client: &http.Client{Timeout: timeout, Transport: roundTripper}}, nil
+}
+
+func (t *Transport) PostJSON(ctx context.Context, targetURL string, payload any, headers map[string]string) (int, []byte, error) {
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return 0, nil, fmt.Errorf("marshal json payload: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, targetURL, bytes.NewReader(body))
+	if err != nil {
+		return 0, nil, fmt.Errorf("build request: %w", err)
+	}
+	for name, value := range headers {
+		req.Header.Set(name, value)
+	}
+	if req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	resp, err := t.client.Do(req)
+	if err != nil {
+		return 0, nil, err
+	}
+	defer resp.Body.Close()
+
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return resp.StatusCode, nil, fmt.Errorf("read response body: %w", err)
+	}
+	return resp.StatusCode, raw, nil
+}
+
+func socks5Dialer(rawProxy string) (proxy.Dialer, error) {
+	proxyURL, err := normalizeSocks5Proxy(rawProxy)
+	if err != nil {
+		return nil, err
+	}
+
+	dialer, err := proxy.SOCKS5("tcp", proxyURL.Host, nil, proxy.Direct)
+	if err != nil {
+		return nil, fmt.Errorf("create socks5 dialer: %w", err)
+	}
+	return dialer, nil
+}
+
+func normalizeSocks5Proxy(rawProxy string) (*url.URL, error) {
+	rawProxy = strings.TrimSpace(rawProxy)
+	if !strings.Contains(rawProxy, "://") {
+		rawProxy = "socks5://" + rawProxy
+	}
+
+	proxyURL, err := url.Parse(rawProxy)
+	if err != nil {
+		return nil, fmt.Errorf("parse socks5 proxy: %w", err)
+	}
+	if proxyURL.Scheme != "socks5" && proxyURL.Scheme != "socks5h" {
+		return nil, fmt.Errorf("unsupported proxy scheme %q", proxyURL.Scheme)
+	}
+	if proxyURL.User != nil {
+		return nil, fmt.Errorf("socks5 proxy authentication is not supported yet")
+	}
+	if _, _, err := net.SplitHostPort(proxyURL.Host); err != nil {
+		return nil, fmt.Errorf("invalid socks5 proxy host %q: %w", proxyURL.Host, err)
+	}
+	return proxyURL, nil
+}