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-rw-r--r--srv/src/api/tpl.go117
1 files changed, 117 insertions, 0 deletions
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
+ }
+ })
+}