| 1 | package contra |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "embed" |
| 6 | "html/template" |
| 7 | "net/http" |
| 8 | |
| 9 | "github.com/carlosframework/rastrillo" |
| 10 | "github.com/carlosframework/rastrillo/ui" |
| 11 | |
| 12 | "github.com/carlosframework/contra/internal/contra/icons" |
| 13 | ) |
| 14 | |
| 15 | //go:embed templates static |
| 16 | var appFS embed.FS |
| 17 | |
| 18 | // assets fingerprints static/: {{asset "static/tokens.css"}} in a |
| 19 | // template returns a content-hashed URL, served immutable-cacheable by |
| 20 | // the handler App mounts. |
| 21 | var assets = rastrillo.NewAssets(appFS) |
| 22 | |
| 23 | // pages is one *template.Template per page, each combining layout.html |
| 24 | // with that page's own file — kept separate so every page can define a |
| 25 | // template named "content" without colliding with the others. |
| 26 | var pages = map[string]*template.Template{} |
| 27 | |
| 28 | func init() { |
| 29 | for _, name := range []string{"index", "errors", "signup", "signup_sent", "signup_passphrase", "signup_passkey", "signin", "vault", "device", "kit"} { |
| 30 | pages[name] = template.Must( |
| 31 | // ui's partials and their helpers first, so every page can |
| 32 | // call one without registering anything. WithIcons points |
| 33 | // ui's two icon seams at the app's own set |
| 34 | // (internal/contra/icons, scaffolded by rastrillo new) — |
| 35 | // both of them, always: passing only icon would leave |
| 36 | // iconAssets on the framework default and silently break |
| 37 | // cdn and js delivery. iconAssets is whatever <head> markup |
| 38 | // the chosen delivery needs, empty for the vendored-inline |
| 39 | // default, so the layout calls it unconditionally and |
| 40 | // switching delivery later needs no template edit. |
| 41 | template.Must(template.New("layout"). |
| 42 | Funcs(ui.Funcs(ui.WithIcons(icons.Icon, icons.Assets))). |
| 43 | Funcs(template.FuncMap{"asset": assets.Path}). |
| 44 | ParseFS(ui.Templates(), "*.html")). |
| 45 | // Then the app's own: the shell and this page's body. |
| 46 | ParseFS(appFS, "templates/layout.html", "templates/"+name+".html")) |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | // render executes name's layout into a buffer before anything touches |
| 51 | // the wire: a template error becomes a clean 500 instead of garbage |
| 52 | // appended to a half-written page, and headers (flash cookies, say) |
| 53 | // stay settable until the status line is written. |
| 54 | func render(w http.ResponseWriter, name string, data any) { |
| 55 | // A name with no template is a wiring mistake, not a runtime one. Without |
| 56 | // this it is a nil-map dereference inside html/template, which panics in |
| 57 | // the handler and reports a segfault rather than the missing page. |
| 58 | page, ok := pages[name] |
| 59 | if !ok { |
| 60 | http.Error(w, "something went wrong", http.StatusInternalServerError) |
| 61 | return |
| 62 | } |
| 63 | |
| 64 | var buf bytes.Buffer |
| 65 | if err := page.ExecuteTemplate(&buf, "layout", data); err != nil { |
| 66 | http.Error(w, "something went wrong", http.StatusInternalServerError) |
| 67 | return |
| 68 | } |
| 69 | buf.WriteTo(w) |
| 70 | } |
| 71 | |
| 72 | // ErrorPage renders the "errors" page — templates/errors.html, which |
| 73 | // wraps ui's error-page partial in the layout — for status inside ref |
| 74 | // (rastrillo.NewRef, or empty when there is none to show). It is the |
| 75 | // rastrillo.ErrorPageFunc cmd/contra/main.go points Options.ErrorPage at, |
| 76 | // so a panic gets the same page a handled failure would; wire it to |
| 77 | // Ctx.ErrorPage too as the app grows handlers of its own. |
| 78 | func ErrorPage(w http.ResponseWriter, r *http.Request, status int, ref string) { |
| 79 | w.WriteHeader(status) |
| 80 | render(w, "errors", map[string]any{"Status": status, "Ref": ref}) |
| 81 | } |
| 82 | |
amadan