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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // Package handlers contains a specific handlers | ||
| package handlers | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
| "regexp" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/axllent/mailpit/config" | ||
| "github.com/axllent/mailpit/utils/logger" | ||
| ) | ||
|
|
||
| var linkRe = regexp.MustCompile(`(?i)^https?:\/\/`) | ||
|
|
||
| // ProxyHandler is used to proxy assets for printing | ||
| func ProxyHandler(w http.ResponseWriter, r *http.Request) { | ||
| uri := strings.TrimSpace(r.URL.Query().Get("url")) | ||
| if uri == "" { | ||
| logger.Log().Warn("[proxy] URL missing") | ||
| httpError(w, "Error: URL missing") | ||
| return | ||
| } | ||
|
|
||
| if !linkRe.MatchString(uri) { | ||
| logger.Log().Warnf("[proxy] invalid URL %s", uri) | ||
| httpError(w, "Error: invalid URL") | ||
| return | ||
| } | ||
|
|
||
| client := &http.Client{ | ||
| Timeout: 10 * time.Second, | ||
| } | ||
|
|
||
| req, err := http.NewRequest("GET", uri, nil) | ||
| if err != nil { | ||
| logger.Log().Warnf("[proxy] %s", err.Error()) | ||
| httpError(w, err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // use requesting useragent | ||
| req.Header.Set("User-Agent", r.UserAgent()) | ||
|
|
||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| logger.Log().Warnf("[proxy] %s", err.Error()) | ||
| httpError(w, err.Error()) | ||
| return | ||
| } | ||
|
|
||
| defer resp.Body.Close() | ||
| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| logger.Log().Warnf("[proxy] %s", err.Error()) | ||
| httpError(w, err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // relay common headers | ||
| if resp.Header.Get("content-type") != "" { | ||
| w.Header().Set("content-type", resp.Header.Get("content-type")) | ||
| } | ||
| if resp.Header.Get("last-modified") != "" { | ||
| w.Header().Set("last-modified", resp.Header.Get("last-modified")) | ||
| } | ||
| if resp.Header.Get("content-disposition") != "" { | ||
| w.Header().Set("content-disposition", resp.Header.Get("content-disposition")) | ||
| } | ||
| if resp.Header.Get("cache-control") != "" { | ||
| w.Header().Set("cache-control", resp.Header.Get("cache-control")) | ||
| } | ||
|
|
||
| // replace url() values with proxy address, eg: fonts & images | ||
| if strings.HasPrefix(resp.Header.Get("content-type"), "text/css") { | ||
| var re = regexp.MustCompile(`(?mi)(url\((\'|\")?([^\)\'\"]+)(\'|\")?\))`) | ||
| body = re.ReplaceAllFunc(body, func(s []byte) []byte { | ||
| parts := re.FindStringSubmatch(string(s)) | ||
|
|
||
| // don't resolve inline `data:..` | ||
| if strings.HasPrefix(parts[3], "data:") { | ||
| return []byte(parts[3]) | ||
| } | ||
|
|
||
| address, err := absoluteURL(parts[3], uri) | ||
| if err != nil { | ||
| logger.Log().Error(err) | ||
| return []byte(parts[3]) | ||
| } | ||
|
|
||
| return []byte("url(" + parts[2] + config.Webroot + "proxy?url=" + url.QueryEscape(address) + parts[4] + ")") | ||
| }) | ||
| } | ||
|
|
||
| logger.Log().Debugf("[proxy] %s (%d)", uri, resp.StatusCode) | ||
|
|
||
| // relay status code - WriteHeader must come after Header.Set() | ||
| w.WriteHeader(resp.StatusCode) | ||
|
|
||
| w.Write(body) | ||
| } | ||
|
|
||
| // AbsoluteURL will return a full URL regardless whether it is relative or absolute | ||
| func absoluteURL(link, baseURL string) (string, error) { | ||
| // scheme relative links, eg <script src="//example.com/script.js"> | ||
| if len(link) > 1 && link[0:2] == "//" { | ||
| base, err := url.Parse(baseURL) | ||
| if err != nil { | ||
| return link, err | ||
| } | ||
| link = base.Scheme + ":" + link | ||
| } | ||
|
|
||
| u, err := url.Parse(link) | ||
| if err != nil { | ||
| return link, err | ||
| } | ||
|
|
||
| // remove hashes | ||
| u.Fragment = "" | ||
|
|
||
| base, err := url.Parse(baseURL) | ||
| if err != nil { | ||
| return link, err | ||
| } | ||
|
|
||
| result := base.ResolveReference(u) | ||
|
|
||
| // ensure link is HTTP(S) | ||
| if result.Scheme != "http" && result.Scheme != "https" { | ||
| return link, fmt.Errorf("Invalid URL: %s", result.String()) | ||
| } | ||
|
|
||
| return result.String(), nil | ||
| } | ||
|
|
||
| // HTTPError returns a basic error message (400 response) | ||
| func httpError(w http.ResponseWriter, msg string) { | ||
| w.Header().Set("Referrer-Policy", "no-referrer") | ||
| w.Header().Set("Content-Security-Policy", config.ContentSecurityPolicy) | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| w.Header().Set("Content-Type", "text/plain") | ||
| fmt.Fprint(w, msg) | ||
| } |
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