package core import ( "errors" "net/http" "os" "path/filepath" "strings" ) // PageHandler is the catch-all route handler, for serving static web pages. func (b *Blog) PageHandler(w http.ResponseWriter, r *http.Request) { path := r.URL.Path log.Debug("Catch-all page handler invoked for request URI: %s", path) // Remove trailing slashes by redirecting them away. if len(path) > 1 && path[len(path)-1] == '/' { b.Redirect(w, strings.TrimRight(path, "/")) return } // Restrict special paths. if strings.HasPrefix(strings.ToLower(path), "/.") { b.Forbidden(w, r) return } // Search for a file that matches their URL. filepath, err := b.ResolvePath(path) if err != nil { b.NotFound(w, r, "The page you were looking for was not found.") return } // Is it a template file? if strings.HasSuffix(filepath.URI, ".gohtml") || strings.HasSuffix(filepath.URI, ".html") { b.RenderTemplate(w, r, filepath.URI, nil) return } http.ServeFile(w, r, filepath.Absolute) } // Filepath represents a file discovered in the document roots, and maintains // both its relative and absolute components. type Filepath struct { // Canonicalized URI version of the file resolved on disk, // possible with a file extension injected. // (i.e. "/about" -> "about.html") URI string Relative string // Relative path including document root (i.e. "root/about.html") Absolute string // Absolute path on disk (i.e. "/opt/blog/root/about.html") } func (f Filepath) String() string { return f.Relative } // ResolvePath matches a filesystem path to a relative request URI. // // This checks the UserRoot first and then the DocumentRoot. This way the user // may override templates from the core app's document root. func (b *Blog) ResolvePath(path string) (Filepath, error) { // Strip leading slashes. if path[0] == '/' { path = strings.TrimPrefix(path, "/") } // If you need to debug this function, edit this block. debug := func(tmpl string, args ...interface{}) { if false { log.Debug(tmpl, args...) } } debug("Resolving filepath for URI: %s", path) for _, root := range []string{b.DocumentRoot, b.UserRoot} { if len(root) == 0 { continue } // Resolve the file path. relPath := filepath.Join(root, path) absPath, err := filepath.Abs(relPath) if err != nil { log.Error("%v", err) } debug("Expected filepath: %s", absPath) // Found an exact hit? if stat, err := os.Stat(absPath); !os.IsNotExist(err) && !stat.IsDir() { debug("Exact filepath found: %s", absPath) return Filepath{path, relPath, absPath}, nil } // Try some supported suffixes. suffixes := []string{ ".gohtml", ".html", "/index.gohtml", "/index.html", ".md", "/index.md", } for _, suffix := range suffixes { test := absPath + suffix if stat, err := os.Stat(test); !os.IsNotExist(err) && !stat.IsDir() { debug("Filepath found via suffix %s: %s", suffix, test) return Filepath{path + suffix, relPath + suffix, test}, nil } } } return Filepath{}, errors.New("not found") }