mirror of
https://github.com/mjl-/mox.git
synced 2024-12-26 16:33:47 +03:00
436 lines
12 KiB
Go
436 lines
12 KiB
Go
package http
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import (
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"context"
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"errors"
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"fmt"
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htmltemplate "html/template"
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"io"
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golog "log"
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"net/http"
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"net/http/httputil"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"syscall"
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"time"
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"github.com/mjl-/mox/config"
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"github.com/mjl-/mox/dns"
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"github.com/mjl-/mox/mlog"
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"github.com/mjl-/mox/mox-"
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"github.com/mjl-/mox/moxio"
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)
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// WebHandle serves an HTTP request by going through the list of WebHandlers,
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// check if there is a domain+path match, and running the handler if so.
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// WebHandle runs after the built-in handlers for mta-sts, autoconfig, etc.
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// If no handler matched, false is returned.
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// WebHandle sets w.Name to that of the matching handler.
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func WebHandle(w *loggingWriter, r *http.Request, host dns.Domain) (handled bool) {
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redirects, handlers := mox.Conf.WebServer()
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for from, to := range redirects {
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if host != from {
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continue
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}
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u := r.URL
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u.Scheme = "https"
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u.Host = to.Name()
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w.Handler = "(domainredirect)"
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http.Redirect(w, r, u.String(), http.StatusPermanentRedirect)
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return true
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}
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for _, h := range handlers {
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if host != h.DNSDomain {
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continue
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}
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loc := h.Path.FindStringIndex(r.URL.Path)
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if loc == nil {
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continue
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}
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s := loc[0]
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e := loc[1]
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path := r.URL.Path[s:e]
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if r.TLS == nil && !h.DontRedirectPlainHTTP {
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u := *r.URL
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u.Scheme = "https"
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u.Host = h.DNSDomain.Name()
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w.Handler = h.Name
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http.Redirect(w, r, u.String(), http.StatusPermanentRedirect)
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return true
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}
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if h.WebStatic != nil && HandleStatic(h.WebStatic, w, r) {
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w.Handler = h.Name
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return true
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}
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if h.WebRedirect != nil && HandleRedirect(h.WebRedirect, w, r) {
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w.Handler = h.Name
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return true
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}
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if h.WebForward != nil && HandleForward(h.WebForward, w, r, path) {
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w.Handler = h.Name
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return true
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}
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}
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return false
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}
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var lsTemplate = htmltemplate.Must(htmltemplate.New("ls").Parse(`<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>ls</title>
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<style>
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body, html { padding: 1em; font-size: 16px; }
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* { font-size: inherit; font-family: ubuntu, lato, sans-serif; margin: 0; padding: 0; box-sizing: border-box; }
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h1 { margin-bottom: 1ex; font-size: 1.2rem; }
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table td, table th { padding: .2em .5em; }
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table > tbody > tr:nth-child(odd) { background-color: #f8f8f8; }
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[title] { text-decoration: underline; text-decoration-style: dotted; }
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</style>
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</head>
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<body>
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<h1>ls</h1>
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<table>
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<thead>
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<tr>
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<th>Size in MB</th>
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<th>Modified (UTC)</th>
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<th>Name</th>
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</tr>
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</thead>
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<tbody>
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{{ if not .Files }}
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<tr><td colspan="3">No files.</td></tr>
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{{ end }}
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{{ range .Files }}
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<tr>
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<td title="{{ .Size }} bytes" style="text-align: right">{{ .SizeReadable }}{{ if .SizePad }}<span style="visibility:hidden">. </span>{{ end }}</td>
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<td>{{ .Modified }}</td>
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<td><a style="display: block" href="{{ .Name }}">{{ .Name }}</a></td>
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</tr>
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{{ end }}
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</tbody>
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</table>
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</body>
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</html>
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`))
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// HandleStatic serves static files. If a directory is requested and the URL
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// path doesn't end with a slash, a response with a redirect to the URL path with trailing
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// slash is written. If a directory is requested and an index.html exists, that
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// file is returned. Otherwise, for directories with ListFiles configured, a
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// directory listing is returned.
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func HandleStatic(h *config.WebStatic, w http.ResponseWriter, r *http.Request) (handled bool) {
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log := func() *mlog.Log {
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return xlog.WithContext(r.Context())
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}
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recvid := func() string {
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cid := mox.CidFromCtx(r.Context())
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if cid <= 0 {
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return ""
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}
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return " (id " + mox.ReceivedID(cid) + ")"
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}
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if r.Method != "GET" && r.Method != "HEAD" {
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if h.ContinueNotFound {
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// Give another handler that is presumbly configured, for the same path, a chance.
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// E.g. an app that may generate this file for future requests to pick up.
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return false
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}
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http.Error(w, "405 - method not allowed", http.StatusMethodNotAllowed)
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return true
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}
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var fspath string
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if h.StripPrefix != "" {
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if !strings.HasPrefix(r.URL.Path, h.StripPrefix) {
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if h.ContinueNotFound {
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// We haven't handled this request, try a next WebHandler in the list.
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return false
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}
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http.NotFound(w, r)
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return true
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}
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fspath = filepath.Join(h.Root, strings.TrimPrefix(r.URL.Path, h.StripPrefix))
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} else {
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fspath = filepath.Join(h.Root, r.URL.Path)
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}
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// fspath will not have a trailing slash anymore, we'll correct for it
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// later when the path turns out to be file instead of a directory.
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serveFile := func(name string, mtime time.Time, content *os.File) {
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// ServeContent only sets a content-type if not already present in the response headers.
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hdr := w.Header()
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for k, v := range h.ResponseHeaders {
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hdr.Add(k, v)
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}
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http.ServeContent(w, r, name, mtime, content)
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}
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f, err := os.Open(fspath)
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if err != nil {
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if os.IsNotExist(err) || errors.Is(err, syscall.ENOTDIR) {
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if h.ContinueNotFound {
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// We haven't handled this request, try a next WebHandler in the list.
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return false
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}
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http.NotFound(w, r)
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return true
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} else if os.IsPermission(err) {
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// If we tried opening a directory, we may not have permission to read it, but
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// still access files inside it (execute bit), such as index.html. So try to serve it.
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index, err := os.Open(filepath.Join(fspath, "index.html"))
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if err == nil {
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defer index.Close()
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var ifi os.FileInfo
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ifi, err = index.Stat()
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if err != nil {
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log().Errorx("stat index.html in directory we cannot list", err, mlog.Field("url", r.URL), mlog.Field("fspath", fspath))
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http.Error(w, "500 - internal server error"+recvid(), http.StatusInternalServerError)
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return true
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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serveFile("index.html", ifi.ModTime(), index)
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return true
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}
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http.Error(w, "403 - permission denied", http.StatusForbidden)
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return true
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}
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log().Errorx("open file for static file serving", err, mlog.Field("url", r.URL), mlog.Field("fspath", fspath))
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http.Error(w, "500 - internal server error"+recvid(), http.StatusInternalServerError)
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return true
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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log().Errorx("stat file for static file serving", err, mlog.Field("url", r.URL), mlog.Field("fspath", fspath))
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http.Error(w, "500 - internal server error"+recvid(), http.StatusInternalServerError)
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return true
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}
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// Redirect if the local path is a directory.
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if fi.IsDir() && !strings.HasSuffix(r.URL.Path, "/") {
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http.Redirect(w, r, r.URL.Path+"/", http.StatusTemporaryRedirect)
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return true
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} else if !fi.IsDir() && strings.HasSuffix(r.URL.Path, "/") {
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if h.ContinueNotFound {
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return false
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}
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http.NotFound(w, r)
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return true
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}
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if fi.IsDir() {
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index, err := os.Open(filepath.Join(fspath, "index.html"))
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if err != nil && os.IsPermission(err) {
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http.Error(w, "403 - permission denied", http.StatusForbidden)
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return true
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} else if err != nil && os.IsNotExist(err) && !h.ListFiles {
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if h.ContinueNotFound {
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return false
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}
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http.Error(w, "403 - permission denied", http.StatusForbidden)
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return true
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} else if err == nil {
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defer index.Close()
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var ifi os.FileInfo
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ifi, err = index.Stat()
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if err == nil {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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serveFile("index.html", ifi.ModTime(), index)
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return true
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}
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}
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if !os.IsNotExist(err) {
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log().Errorx("stat for static file serving", err, mlog.Field("url", r.URL), mlog.Field("fspath", fspath))
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http.Error(w, "500 - internal server error"+recvid(), http.StatusInternalServerError)
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return true
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}
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type File struct {
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Name string
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Size int64
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SizeReadable string
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SizePad bool // Whether the size needs padding because it has no decimal point.
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Modified string
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}
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files := []File{}
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if r.URL.Path != "/" {
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files = append(files, File{"..", 0, "", false, ""})
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}
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for {
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l, err := f.Readdir(1000)
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for _, e := range l {
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mb := float64(e.Size()) / (1024 * 1024)
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var size string
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var sizepad bool
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if !e.IsDir() {
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if mb >= 10 {
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size = fmt.Sprintf("%d", int64(mb))
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sizepad = true
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} else {
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size = fmt.Sprintf("%.2f", mb)
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}
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}
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const dateTime = "2006-01-02 15:04:05" // time.DateTime, but only since go1.20.
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modified := e.ModTime().UTC().Format(dateTime)
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f := File{e.Name(), e.Size(), size, sizepad, modified}
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if e.IsDir() {
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f.Name += "/"
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}
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files = append(files, f)
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}
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if err == io.EOF {
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break
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} else if err != nil {
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log().Errorx("reading directory for file listing", err, mlog.Field("url", r.URL), mlog.Field("fspath", fspath))
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http.Error(w, "500 - internal server error"+recvid(), http.StatusInternalServerError)
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return true
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}
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}
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sort.Slice(files, func(i, j int) bool {
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return files[i].Name < files[j].Name
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})
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hdr := w.Header()
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hdr.Set("Content-Type", "text/html; charset=utf-8")
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for k, v := range h.ResponseHeaders {
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if !strings.EqualFold(k, "content-type") {
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hdr.Add(k, v)
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}
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}
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err = lsTemplate.Execute(w, map[string]any{"Files": files})
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if err != nil && !moxio.IsClosed(err) {
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log().Errorx("executing directory listing template", err)
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}
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return true
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}
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serveFile(fspath, fi.ModTime(), f)
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return true
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}
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// HandleRedirect writes a response with an HTTP redirect.
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func HandleRedirect(h *config.WebRedirect, w http.ResponseWriter, r *http.Request) (handled bool) {
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var dstpath string
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if h.OrigPath == nil {
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// No path rewrite necessary.
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dstpath = r.URL.Path
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} else if !h.OrigPath.MatchString(r.URL.Path) {
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http.NotFound(w, r)
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return true
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} else {
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dstpath = h.OrigPath.ReplaceAllString(r.URL.Path, h.ReplacePath)
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}
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u := *r.URL
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u.Opaque = ""
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u.RawPath = ""
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u.OmitHost = false
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if h.URL != nil {
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u.Scheme = h.URL.Scheme
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u.Host = h.URL.Host
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u.ForceQuery = h.URL.ForceQuery
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u.RawQuery = h.URL.RawQuery
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u.Fragment = h.URL.Fragment
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if r.URL.RawQuery != "" {
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if u.RawQuery != "" {
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u.RawQuery += "&"
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}
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u.RawQuery += r.URL.RawQuery
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}
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}
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u.Path = dstpath
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code := http.StatusPermanentRedirect
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if h.StatusCode != 0 {
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code = h.StatusCode
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}
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// If we would be redirecting to the same scheme,host,path, we would get here again
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// causing a redirect loop. Instead, this causes this redirect to not match,
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// allowing to try the next WebHandler. This can be used to redirect all plain http
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// requests to https.
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reqscheme := "http"
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if r.TLS != nil {
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reqscheme = "https"
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}
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if reqscheme == u.Scheme && r.Host == u.Host && r.URL.Path == u.Path {
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return false
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}
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http.Redirect(w, r, u.String(), code)
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return true
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}
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// HandleForward handles a request by forwarding it to another webserver and
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// passing the response on. I.e. a reverse proxy.
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func HandleForward(h *config.WebForward, w http.ResponseWriter, r *http.Request, path string) (handled bool) {
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log := func() *mlog.Log {
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return xlog.WithContext(r.Context())
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}
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recvid := func() string {
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cid := mox.CidFromCtx(r.Context())
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if cid <= 0 {
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return ""
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}
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return " (id " + mox.ReceivedID(cid) + ")"
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}
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xr := *r
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r = &xr
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if h.StripPath {
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u := *r.URL
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u.Path = r.URL.Path[len(path):]
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u.RawPath = ""
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r.URL = &u
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}
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// Remove any forwarded headers passed in by client.
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hdr := http.Header{}
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for k, vl := range r.Header {
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if k == "Forwarded" || k == "X-Forwarded" || strings.HasPrefix(k, "X-Forwarded-") {
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continue
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}
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hdr[k] = vl
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}
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r.Header = hdr
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// Add our own X-Forwarded headers. ReverseProxy will add X-Forwarded-For.
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r.Header["X-Forwarded-Host"] = []string{r.Host}
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proto := "http"
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if r.TLS != nil {
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proto = "https"
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}
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r.Header["X-Forwarded-Proto"] = []string{proto}
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// todo: add Forwarded header? is anyone using it?
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// ReverseProxy will append any remaining path to the configured target URL.
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proxy := httputil.NewSingleHostReverseProxy(h.TargetURL)
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proxy.FlushInterval = time.Duration(-1) // Flush after each write.
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proxy.ErrorLog = golog.New(mlog.ErrWriter(mlog.New("net/http/httputil").WithContext(r.Context()), mlog.LevelDebug, "reverseproxy error"), "", 0)
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proxy.ErrorHandler = func(w http.ResponseWriter, r *http.Request, err error) {
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if errors.Is(err, context.Canceled) {
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log().Debugx("forwarding request to backend webserver", err, mlog.Field("url", r.URL))
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return
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}
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log().Errorx("forwarding request to backend webserver", err, mlog.Field("url", r.URL))
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if os.IsTimeout(err) {
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http.Error(w, "504 - gateway timeout"+recvid(), http.StatusGatewayTimeout)
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} else {
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http.Error(w, "502 - bad gateway"+recvid(), http.StatusBadGateway)
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}
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}
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whdr := w.Header()
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for k, v := range h.ResponseHeaders {
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whdr.Add(k, v)
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}
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proxy.ServeHTTP(w, r)
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return true
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}
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