hjz
69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package web_search
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import (
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/Tencent/WeKnora/internal/utils"
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)
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// ValidateProxyURL delegates to utils.ValidateURLForSSRF (only http/https pass that check).
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func ValidateProxyURL(proxyURL string) error {
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proxyURL = strings.TrimSpace(proxyURL)
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if proxyURL == "" {
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return nil
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}
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return utils.ValidateURLForSSRF(proxyURL)
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}
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func ssrfSafeRedirect(maxRedirects int) func(*http.Request, []*http.Request) error {
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return func(req *http.Request, via []*http.Request) error {
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if len(via) >= maxRedirects {
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return fmt.Errorf("stopped after %d redirects", maxRedirects)
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}
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if err := utils.ValidateURLForSSRF(req.URL.String()); err != nil {
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return fmt.Errorf("%w: %v", utils.ErrSSRFRedirectBlocked, err)
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}
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return nil
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}
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}
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// NewSearchHTTPClient builds an http.Client for outbound web search requests.
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// It uses utils.SSRFSafeDialContext, optional explicit or environment proxy, and
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// redirect validation consistent with utils.NewSSRFSafeHTTPClient.
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func NewSearchHTTPClient(timeout time.Duration, proxyURL string) (*http.Client, error) {
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proxyURL = strings.TrimSpace(proxyURL)
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def, ok := http.DefaultTransport.(*http.Transport)
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if !ok {
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return nil, fmt.Errorf("default HTTP transport is not *http.Transport")
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}
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t := def.Clone()
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t.DialContext = utils.SSRFSafeDialContext
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if proxyURL != "" {
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if err := ValidateProxyURL(proxyURL); err != nil {
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return nil, err
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}
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u, err := url.Parse(proxyURL)
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if err != nil {
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return nil, fmt.Errorf("invalid proxy_url: %w", err)
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}
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if u.Scheme == "" || u.Host == "" {
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return nil, fmt.Errorf("invalid proxy_url: scheme and host are required")
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}
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t.Proxy = http.ProxyURL(u)
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} else {
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t.Proxy = http.ProxyFromEnvironment
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}
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cfg := utils.DefaultSSRFSafeHTTPClientConfig()
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return &http.Client{
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Timeout: timeout,
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Transport: t,
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CheckRedirect: ssrfSafeRedirect(cfg.MaxRedirects),
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}, nil
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}
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