From 5a997781871db4c1f504e2f59e14541bb1e62dcb Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Fri, 20 May 2022 07:59:36 -0600
Subject: Scatter render.go contents everywhere

---
 srv/src/api/tpl.go | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 srv/src/api/tpl.go

(limited to 'srv/src/api/tpl.go')

diff --git a/srv/src/api/tpl.go b/srv/src/api/tpl.go
new file mode 100644
index 0000000..8d85de9
--- /dev/null
+++ b/srv/src/api/tpl.go
@@ -0,0 +1,117 @@
+package api
+
+import (
+	"embed"
+	"fmt"
+	"html/template"
+	"io/fs"
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
+)
+
+//go:embed tpl
+var tplFS embed.FS
+
+func mustReadTplFile(fileName string) string {
+	path := filepath.Join("tpl", fileName)
+
+	b, err := fs.ReadFile(tplFS, path)
+	if err != nil {
+		panic(fmt.Errorf("reading file %q from tplFS: %w", path, err))
+	}
+
+	return string(b)
+}
+
+func (a *api) mustParseTpl(name string) *template.Template {
+
+	blogURL := func(path string) string {
+
+		trailingSlash := strings.HasSuffix(path, "/")
+		path = filepath.Join(a.params.PathPrefix, "/v2", path)
+
+		if trailingSlash {
+			path += "/"
+		}
+
+		return path
+	}
+
+	tpl := template.New("").Funcs(template.FuncMap{
+		"BlogURL": blogURL,
+		"AssetURL": func(path string) string {
+			path = filepath.Join("assets", path)
+			return blogURL(path)
+		},
+	})
+
+	tpl = template.Must(tpl.Parse(mustReadTplFile(name)))
+
+	return tpl
+}
+
+func (a *api) mustParseBasedTpl(name string) *template.Template {
+	tpl := a.mustParseTpl(name)
+	tpl = template.Must(tpl.New("base.html").Parse(mustReadTplFile("base.html")))
+	return tpl
+}
+
+type tplData struct {
+	Payload   interface{}
+	CSRFToken string
+}
+
+func (t tplData) CSRFFormInput() template.HTML {
+	return template.HTML(fmt.Sprintf(
+		`<input type="hidden" name="%s" value="%s" />`,
+		csrfTokenFormName, t.CSRFToken,
+	))
+}
+
+// executeTemplate expects to be the final action in an http.Handler
+func executeTemplate(
+	rw http.ResponseWriter, r *http.Request,
+	tpl *template.Template, payload interface{},
+) {
+
+	csrfToken, _ := apiutil.GetCookie(r, csrfTokenCookieName, "")
+
+	tplData := tplData{
+		Payload:   payload,
+		CSRFToken: csrfToken,
+	}
+
+	if err := tpl.Execute(rw, tplData); err != nil {
+		apiutil.InternalServerError(
+			rw, r, fmt.Errorf("rendering template: %w", err),
+		)
+		return
+	}
+}
+
+func (a *api) executeRedirectTpl(
+	rw http.ResponseWriter, r *http.Request, path string,
+) {
+	executeTemplate(rw, r, a.redirectTpl, struct {
+		Path string
+	}{
+		Path: path,
+	})
+}
+
+func (a *api) renderDumbTplHandler(tplName string) http.Handler {
+
+	tpl := a.mustParseBasedTpl(tplName)
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		if err := tpl.Execute(rw, nil); err != nil {
+			apiutil.InternalServerError(
+				rw, r, fmt.Errorf("rendering %q: %w", tplName, err),
+			)
+			return
+		}
+	})
+}
-- 
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