1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/cgi/gemini.go b/contrib/cgi/gemini.go
new file mode 100644
index 0000000..8302e7e
--- /dev/null
+++ b/contrib/cgi/gemini.go
@@ -0,0 +1,47 @@
+package cgi
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"tildegit.org/tjp/gus"
+	"tildegit.org/tjp/gus/gemini"
+)
+
+// GeminiCGIDirectory 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 GeminiCGIDirectory(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 gemini.Failure(err)
+		}
+		if filepath == "" {
+			return nil
+		}
+
+		stdout, exitCode, err := RunCGI(ctx, request, filepath, pathinfo)
+		if err != nil {
+			return gemini.Failure(err)
+		}
+		if exitCode != 0 {
+			return gemini.CGIError(fmt.Sprintf("CGI process exited with status %d", exitCode))
+		}
+
+		response, err := gemini.ParseResponse(stdout)
+		if err != nil {
+			return gemini.Failure(err)
+		}
+		return response
+	}
+}