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|
package gmi
import (
"bytes"
"context"
"embed"
"errors"
"fmt"
"io"
"io/fs"
"mime"
"net/url"
"path"
"path/filepath"
"strings"
"text/template"
"dev.mediocregopher.com/mediocre-blog.git/src/post"
"dev.mediocregopher.com/mediocre-blog.git/src/render"
"dev.mediocregopher.com/mediocre-go-lib.git/mctx"
"git.sr.ht/~adnano/go-gemini"
)
type ctxKey string
const (
ctxKeyTplPath ctxKey = "tplPath"
)
func withTplPath(ctx context.Context, path string) context.Context {
return context.WithValue(ctx, ctxKeyTplPath, path)
}
//go:embed tpl
var tplFS embed.FS
func (a *api) tplHandler() (gemini.Handler, error) {
blogURL := func(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()
}
preprocessFuncs := post.PreprocessFunctions{
BlogURL: func(path string) string {
return blogURL(a.params.PublicURL, path, false)
},
BlogHTTPURL: func(path string) string {
return blogURL(a.params.HTTPPublicURL, path, true)
},
BlogGeminiURL: func(path string) string {
return blogURL(a.params.PublicURL, path, true)
},
AssetURL: func(id string) string {
path := filepath.Join("assets", id)
return blogURL(a.params.PublicURL, path, false)
},
PostURL: func(id string) string {
path := filepath.Join("posts", id) + ".gmi"
return blogURL(a.params.PublicURL, path, false)
},
StaticURL: func(path string) string {
path = filepath.Join("static", path)
return blogURL(a.params.HTTPPublicURL, path, true)
},
Image: func(args ...string) (string, error) {
var (
id = args[0]
descr = "Image"
)
if len(args) > 1 {
descr = args[1]
}
path := filepath.Join("assets", id)
path = blogURL(a.params.PublicURL, path, false)
return fmt.Sprintf("\n=> %s %s", path, descr), nil
},
}
allTpls := template.New("")
allTpls.Funcs(preprocessFuncs.ToFuncMap())
allTpls.Funcs(template.FuncMap{
"PostURLAbs": func(id string) string {
path := filepath.Join("posts", id) + ".gmi"
return blogURL(a.params.PublicURL, path, true)
},
"PostHTTPURL": func(id string) string {
path := filepath.Join("posts", id)
return preprocessFuncs.BlogHTTPURL(path)
},
})
err := fs.WalkDir(tplFS, "tpl", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
body, err := fs.ReadFile(tplFS, path)
if err != nil {
panic(err)
}
name := strings.TrimPrefix(path, "tpl/")
allTpls, err = allTpls.New(name).Parse(string(body))
if err != nil {
return fmt.Errorf("parsing %q as template: %w", path, err)
}
return nil
})
if err != nil {
return nil, fmt.Errorf("parsing templates: %w", err)
}
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
tplPath, _ := ctx.Value(ctxKeyTplPath).(string)
if tplPath == "" {
tplPath = r.URL.Path
}
tplPath = strings.TrimPrefix(tplPath, "/")
mimeType := mime.TypeByExtension(path.Ext(tplPath))
ctx = mctx.Annotate(ctx,
"url", r.URL,
"tplPath", tplPath,
"mimeType", mimeType,
)
tpl := allTpls.Lookup(tplPath)
if tpl == nil {
rw.WriteHeader(gemini.StatusNotFound, "Page not found, sorry!")
return
}
if mimeType != "" {
rw.SetMediaType(mimeType)
}
buf := new(bytes.Buffer)
err := tpl.Execute(buf, render.NewMethods(
ctx,
r.URL,
a.params.PublicURL,
a.params.HTTPGeminiGatewayURL,
a.params.PostStore,
nil, // asset.Store, not supported by gemini endpoint
nil, // post.DraftStore, not supported by gemini endpoint
preprocessFuncs,
))
if errors.Is(err, post.ErrPostNotFound) {
a.params.Logger.Warn(ctx, "post not found", err)
rw.WriteHeader(gemini.StatusNotFound, "Post not found")
} else if err != nil {
a.params.Logger.Error(ctx, "rendering error", err)
rw.WriteHeader(gemini.StatusTemporaryFailure, err.Error())
return
}
io.Copy(rw, buf)
}), nil
}
|
