From ff05d62013906f3086b452bfeda3e0d5b9b7a541 Mon Sep 17 00:00:00 2001
From: tjpcc <tjp@ctrl-c.club>
Date: Mon, 9 Jan 2023 16:40:24 -0700
Subject: Initial commit.

some basics:
 - minimal README
 - some TODOs
 - server and request handler framework
 - contribs: file serving, request logging
 - server examples
 - CI setup
---
 contrib/fs/file.go | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 contrib/fs/file.go

(limited to 'contrib/fs/file.go')

diff --git a/contrib/fs/file.go b/contrib/fs/file.go
new file mode 100644
index 0000000..cdcd1a9
--- /dev/null
+++ b/contrib/fs/file.go
@@ -0,0 +1,55 @@
+package fs
+
+import (
+	"context"
+	"io/fs"
+	"mime"
+	"strings"
+
+	"tildegit.org/tjp/gus/gemini"
+)
+
+// FileHandler builds a handler function which serves up a file system.
+func FileHandler(fileSystem fs.FS) gemini.Handler {
+	return func(ctx context.Context, req *gemini.Request) *gemini.Response {
+		file, err := fileSystem.Open(strings.TrimPrefix(req.Path, "/"))
+		if isNotFound(err) {
+			return gemini.NotFound("Resource does not exist.")
+		}
+		if err != nil {
+			return gemini.Failure(err)
+		}
+
+		isDir, err := fileIsDir(file)
+		if err != nil {
+			return gemini.Failure(err)
+		}
+
+		if isDir {
+			return gemini.NotFound("Resource does not exist.")
+		}
+
+		return gemini.Success(mediaType(req.Path), file)
+	}
+}
+
+func mediaType(filePath string) string {
+	if strings.HasSuffix(filePath, ".gmi") {
+		// This may not be present in the listings searched by mime.TypeByExtension,
+		// so provide a dedicated fast path for it here.
+		return "text/gemini"
+	}
+
+	slashIdx := strings.LastIndex(filePath, "/")
+	dotIdx := strings.LastIndex(filePath[slashIdx+1:], ".")
+	if dotIdx == -1 {
+		return "application/octet-stream"
+	}
+	ext := filePath[slashIdx+dotIdx:]
+
+	mtype := mime.TypeByExtension(ext)
+	if mtype == "" {
+		return "application/octet-stream"
+	}
+	return mtype
+}
-- 
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