gopher support.

Some of the contrib packages were originally built gemini-specific and
had to be refactored into generic core functionality and thin
protocol-specific wrappers for each of gemini and gopher.

1 files changed, 45 insertions, 0 deletions

diff --git a/contrib/cgi/gopher.go b/contrib/cgi/gopher.go
new file mode 100644
index 0000000..29bfdba
--- /dev/null
+++ b/contrib/cgi/gopher.go
@@ -0,0 +1,45 @@
+package cgi
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"tildegit.org/tjp/gus"
+	"tildegit.org/tjp/gus/gopher"
+)
+
+// 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(pathRoot, fsRoot string) gus.Handler {
+	fsRoot = strings.TrimRight(fsRoot, "/")
+	return func(ctx context.Context, request *gus.Request) *gus.Response {
+		if !strings.HasPrefix(request.Path, pathRoot) {
+			return nil
+		}
+
+		filepath, pathinfo, err := ResolveCGI(request.Path[len(pathRoot):], fsRoot)
+		if err != nil {
+			return gopher.Error(err).Response()
+		}
+		if filepath == "" {
+			return nil
+		}
+
+		stdout, exitCode, err := RunCGI(ctx, request, filepath, pathinfo)
+		if err != nil {
+			return gopher.Error(err).Response()
+		}
+		if exitCode != 0 {
+			return gopher.Error(
+				fmt.Errorf("CGI process exited with status %d", exitCode),
+			).Response()
+		}
+
+		return gopher.File(0, stdout)
+	}
+}