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|
package cgi
import (
"bytes"
"context"
"fmt"
"os"
"path"
"path/filepath"
"strings"
sr "tildegit.org/tjp/sliderule"
"tildegit.org/tjp/sliderule/gopher"
"tildegit.org/tjp/sliderule/gopher/gophermap"
"tildegit.org/tjp/sliderule/logging"
)
// GopherCGIDirectory runs any executable files relative to a root directory on the file system.
//
// It will also find and run any executables part way through the path, so for example
// a request for /foo/bar/baz can also run an executable found at /foo or /foo/bar. In
// such a case the PATH_INFO environment variable will include the remaining portion of
// the URI path.
func GopherCGIDirectory(fsroot, urlroot string, settings *gophermap.FileSystemSettings) sr.Handler {
if settings == nil || !settings.Exec {
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response { return nil })
}
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
requestpath := strings.Trim(strings.TrimPrefix(request.Path, urlroot), "/")
fullpath, pathinfo, err := resolveGopherCGI(fsroot, requestpath)
if err != nil {
return gopher.Error(err).Response()
}
if fullpath == "" {
return nil
}
return runGopherCGI(ctx, request, fullpath, pathinfo, *settings)
})
}
// ExecGopherMaps runs any gophermaps
func ExecGopherMaps(fsroot, urlroot string, settings *gophermap.FileSystemSettings) sr.Handler {
if settings == nil || !settings.Exec {
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response { return nil })
}
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
requestpath := strings.Trim(strings.TrimPrefix(request.Path, urlroot), "/")
fullpath := filepath.Join(fsroot, requestpath)
info, err := os.Stat(fullpath)
if isNotExistError(err) {
return nil
}
if err != nil {
return gopher.Error(err).Response()
}
if info.IsDir() {
for _, fname := range settings.DirMaps {
fpath := filepath.Join(fullpath, fname)
finfo, err := os.Stat(fpath)
if isNotExistError(err) {
continue
}
if err != nil {
return gopher.Error(err).Response()
}
m := finfo.Mode()
if m.IsDir() {
continue
}
if !m.IsRegular() || m&5 != 5 {
continue
}
return runGopherCGI(ctx, request, fpath, "/", *settings)
}
return nil
}
m := info.Mode()
if !m.IsRegular() || m&5 != 5 {
return nil
}
return runGopherCGI(ctx, request, fullpath, "/", *settings)
})
}
func runGopherCGI(
ctx context.Context,
request *sr.Request,
fullpath string,
pathinfo string,
settings gophermap.FileSystemSettings,
) *sr.Response {
stderr := &bytes.Buffer{}
stdout, exitCode, err := RunCGI(ctx, request, fullpath, pathinfo, stderr)
if err != nil {
return gopher.Error(err).Response()
}
if exitCode != 0 {
ctx.Value("warnlog").(logging.Logger).Log(
"msg", "cgi exited with non-zero exit code",
"code", exitCode,
"stderr", stderr.String(),
)
return gopher.Error(
fmt.Errorf("CGI process exited with status %d", exitCode),
).Response()
}
if settings.ParseExtended {
edoc, err := gophermap.ParseExtended(stdout, request.URL)
if err != nil {
return gopher.Error(err).Response()
}
doc, _, err := edoc.Compatible(filepath.Dir(fullpath), settings)
if err != nil {
return gopher.Error(err).Response()
}
return doc.Response()
}
return gopher.File(gopher.MenuType, stdout)
}
func resolveGopherCGI(fsRoot string, reqPath string) (string, string, error) {
segments := append([]string{""}, strings.Split(reqPath, "/")...)
fullpath := fsRoot
for i, segment := range segments {
fullpath = filepath.Join(fullpath, segment)
info, err := os.Stat(fullpath)
if isNotExistError(err) {
return "", "", nil
}
if err != nil {
return "", "", err
}
if !info.IsDir() {
if info.Mode()&5 == 5 {
pathinfo := "/"
if len(segments) > i+1 {
pathinfo = path.Join(segments[i:]...)
}
return fullpath, pathinfo, nil
}
break
}
}
return "", "", nil
}
|
