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package http
import (
"bytes"
"embed"
"errors"
"fmt"
"html/template"
"io"
"io/fs"
"net/http"
"net/url"
"path/filepath"
"strings"
"dev.mediocregopher.com/mediocre-blog.git/src/http/apiutil"
"dev.mediocregopher.com/mediocre-blog.git/src/post"
"dev.mediocregopher.com/mediocre-blog.git/src/render"
)
//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) blogURL(base *url.URL, path string, abs bool) string {
// filepath.Join strips trailing slash, but we want to keep it
trailingSlash := strings.HasSuffix(path, "/")
path = filepath.Join("/", base.Path, path)
if trailingSlash && path != "/" {
path += "/"
}
if !abs {
return path
}
u := *base
u.Path = path
return u.String()
}
func (a *api) postURL(id string, abs bool) string {
path := filepath.Join("posts", id)
return a.blogURL(a.params.PublicURL, path, abs)
}
func (a *api) editPostURL(id string, abs bool) string {
return a.postURL(id, abs) + "?method=edit"
}
func (a *api) managePostsURL(abs bool) string {
return a.blogURL(a.params.PublicURL, "posts?method=manage", abs)
}
func (a *api) manageAssetsURL(abs bool) string {
return a.blogURL(a.params.PublicURL, "assets?method=manage", abs)
}
func (a *api) assetURL(id string, abs bool) string {
path := filepath.Join("assets", id)
return a.blogURL(a.params.PublicURL, path, false)
}
func (a *api) draftPostURL(id string, abs bool) string {
path := filepath.Join("drafts", id)
return a.blogURL(a.params.PublicURL, path, abs)
}
func (a *api) editDraftPostURL(id string, abs bool) string {
return a.draftPostURL(id, abs) + "?method=edit"
}
func (a *api) manageDraftPostsURL(abs bool) string {
return a.blogURL(a.params.PublicURL, "drafts", abs) + "?method=manage"
}
func (a *api) draftsURL(abs bool) string {
return a.blogURL(a.params.PublicURL, "drafts", abs)
}
func mustParseTpl(tpl *template.Template, name string) *template.Template {
return template.Must(tpl.New(name).Parse(mustReadTplFile(name)))
}
func (a *api) mustParseBasedTpl(name string) *template.Template {
tpl := template.New("")
tpl = mustParseTpl(tpl, "gemini-cta.html")
tpl = mustParseTpl(tpl, "base.html")
tpl = mustParseTpl(tpl, name)
return tpl
}
type tplData struct {
*render.Methods
Payload interface{}
Title string
}
// WithTitlePrefix returns a copy of tplData but with the given string prefixed
// to the page title. This is intended for use within templates, when nesting
// the base template.
func (d tplData) WithTitlePrefix(prefix string) tplData {
d.Title = prefix + " - " + d.Title
return d
}
func (a *api) newTPLData(r *http.Request, payload interface{}) tplData {
return tplData{
Methods: render.NewMethods(
r.Context(),
r.URL,
a.params.PublicURL,
a.params.PublicURL, // httpURL
a.params.GeminiPublicURL,
a.params.GeminiGatewayURL,
a.params.PostStore,
a.params.PostAssetStore,
a.params.PostDraftStore,
a.postPreprocessFuncs(),
),
Payload: payload,
Title: "mediocregopher's lil web corner",
}
}
// executeTemplate expects to be the final action in an http.Handler
func (a *api) executeTemplate(
rw http.ResponseWriter,
r *http.Request,
tpl *template.Template,
payload interface{},
) {
tplData := a.newTPLData(r, payload)
buf := new(bytes.Buffer)
err := tpl.Execute(buf, tplData)
if errors.Is(err, post.ErrPostNotFound) {
http.Error(rw, "Post not found", 404)
return
} else if err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering template: %w", err),
)
return
}
io.Copy(rw, buf)
}
func (a *api) executeRedirectTpl(
rw http.ResponseWriter, r *http.Request, url string,
) {
a.executeTemplate(rw, r, a.redirectTpl, struct {
URL string
}{
URL: url,
})
}
func (a *api) renderDumbTplHandler(tplName string) http.Handler {
tpl := a.mustParseBasedTpl(tplName)
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
tplData := a.newTPLData(r, nil)
if err := tpl.Execute(rw, tplData); err != nil {
apiutil.InternalServerError(
rw, r, fmt.Errorf("rendering %q: %w", tplName, err),
)
return
}
})
}
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