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package main
import (
"fmt"
"log"
"net/url"
"os"
"path/filepath"
"strings"
gemini "sanctum.geek.nz/code/go-gemini.git.git"
)
// Handler is the main handler of the server
type Handler struct {
cfg Config
}
func (h Handler) validateRequest(r gemini.Request, absItemPath string) error {
u, err := url.Parse(r.URL)
if err != nil {
return gemini.Error{Err: err, Status: gemini.StatusBadRequest}
}
if u.Scheme != "" && u.Scheme != "gemini" {
err = fmt.Errorf("proxy is not supported by the server")
return gemini.Error{Err: err, Status: gemini.StatusProxyRequestRefused}
}
if !strings.HasPrefix(absItemPath, h.cfg.SourceDir) {
return gemini.Error{Err: fmt.Errorf("permission denied"), Status: gemini.StatusBadRequest}
}
return nil
}
func (h Handler) urlAbsPath(rawURL string) (string, error) {
u, err := url.Parse(rawURL)
if err != nil {
return "", gemini.Error{Err: err, Status: gemini.StatusBadRequest}
}
itemPath, err := filepath.Abs(filepath.Join(h.cfg.SourceDir, u.Path))
if err != nil {
return "", gemini.Error{Err: err, Status: gemini.StatusTemporaryFailure}
}
return itemPath, nil
}
func (h Handler) getFilePath(rawURL string) (string, error) {
itemPath, err := h.urlAbsPath(rawURL)
if err != nil {
return "", err
}
if isFile(itemPath) {
return itemPath, nil
}
for _, indexFile := range h.cfg.IndexFiles {
indexPath := filepath.Join(itemPath, indexFile)
if isFile(indexPath) {
return indexPath, nil
}
}
return "", gemini.Error{Err: fmt.Errorf("file not found"), Status: gemini.StatusNotFound}
}
func (h Handler) serveFile(path string) gemini.Response {
log.Println("Serving file from", path)
file, err := os.Open(path)
if err != nil {
return gemini.ErrorResponse(err)
}
meta := absPathMime(path)
return gemini.Response{Status: gemini.StatusSuccess, Meta: meta, Body: file}
}
// Handle implement the gemini.Handler interface by serving files from a given source directory
func (h Handler) Handle(r gemini.Request) gemini.Response {
path, err := h.getFilePath(r.URL)
if err != nil {
return gemini.ErrorResponse(err)
}
err = h.validateRequest(r, path)
if err != nil {
return gemini.ErrorResponse(err)
}
return h.serveFile(path)
}
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