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package cgi
import (
"bytes"
"context"
"fmt"
"path/filepath"
"strings"
sr "tildegit.org/tjp/sliderule"
"tildegit.org/tjp/sliderule/logging"
"tildegit.org/tjp/sliderule/spartan"
)
// SpartanCGIDirectory 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 SpartanCGIDirectory(fsroot, urlroot, cmd string) sr.Handler {
fsroot = strings.TrimRight(fsroot, "/")
return sr.HandlerFunc(func(ctx context.Context, request *sr.Request) *sr.Response {
if !strings.HasPrefix(request.Path, urlroot) {
return nil
}
execpath, pathinfo, err := ResolveCGI(request.Path[len(urlroot):], fsroot)
if err != nil {
return spartan.ServerError(err)
}
if execpath == "" {
return nil
}
workdir := filepath.Dir(execpath)
if cmd != "" {
execpath = cmd
}
stderr := &bytes.Buffer{}
stdout, exitCode, err := RunCGI(ctx, request, execpath, pathinfo, workdir, stderr)
if err != nil {
return spartan.ServerError(err)
}
if exitCode != 0 {
ctx.Value("warnlog").(logging.Logger).Log(
"msg", "cgi exited with non-zero exit code",
"code", exitCode,
"stderr", stderr.String(),
)
return spartan.ServerError(fmt.Errorf("CGI process exited with status %d", exitCode))
}
response, err := spartan.ParseResponse(stdout)
if err != nil {
return spartan.ServerError(err)
}
return response
})
}
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