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// Package gmi implements the gemini-based api for the mediocre-blog.
package gmi
import (
"context"
"errors"
"fmt"
"mime"
"net/url"
"os"
"path"
"strings"
"git.sr.ht/~adnano/go-gemini"
"git.sr.ht/~adnano/go-gemini/certificate"
"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
// Params are used to instantiate a new API instance. All fields are required
// unless otherwise noted.
type Params struct {
Logger *mlog.Logger
PostStore post.Store
PostAssetStore post.AssetStore
PublicURL *url.URL
ListenAddr string
CertificatesPath string
HTTPPublicURL *url.URL
}
// SetupCfg implement the cfg.Cfger interface.
func (p *Params) SetupCfg(cfg *cfg.Cfg) {
publicURLStr := cfg.String("gemini-public-url", "gemini://localhost:2065", "URL this service is accessible at")
cfg.StringVar(&p.ListenAddr, "gemini-listen-addr", ":2065", "Address to listen for HTTP requests on")
cfg.StringVar(&p.CertificatesPath, "gemini-certificates-path", "", "Path to directory where gemini certs should be created/stored")
cfg.OnInit(func(context.Context) error {
if p.CertificatesPath == "" {
return errors.New("-gemini-certificates-path is required")
}
var err error
*publicURLStr = strings.TrimSuffix(*publicURLStr, "/")
if p.PublicURL, err = url.Parse(*publicURLStr); err != nil {
return fmt.Errorf("parsing -gemini-public-url: %w", err)
}
return nil
})
}
// Annotate implements mctx.Annotator interface.
func (p *Params) Annotate(a mctx.Annotations) {
a["geminiPublicURL"] = p.PublicURL
a["geminiListenAddr"] = p.ListenAddr
a["geminiCertificatesPath"] = p.CertificatesPath
}
// API will listen on the port configured for it, and serve gemini requests for
// the mediocre-blog.
type API interface {
Shutdown(ctx context.Context) error
}
type api struct {
params Params
srv *gemini.Server
}
// New initializes and returns a new API instance, including setting up all
// listening ports.
func New(params Params) (API, error) {
if err := os.MkdirAll(params.CertificatesPath, 0700); err != nil {
return nil, fmt.Errorf("creating certificate directory %q: %w", params.CertificatesPath, err)
}
certStore := new(certificate.Store)
certStore.Load(params.CertificatesPath)
certStore.Register(params.PublicURL.Hostname())
a := &api{
params: params,
}
handler, err := a.handler()
if err != nil {
return nil, fmt.Errorf("constructing handler: %w", err)
}
a.srv = &gemini.Server{
Addr: params.ListenAddr,
Handler: handler,
GetCertificate: certStore.Get,
}
go func() {
ctx := mctx.WithAnnotator(context.Background(), &a.params)
err := a.srv.ListenAndServe(ctx)
if err != nil && !errors.Is(err, context.Canceled) {
a.params.Logger.Fatal(ctx, "serving gemini server", err)
}
}()
return a, nil
}
func (a *api) Shutdown(ctx context.Context) error {
return a.srv.Shutdown(ctx)
}
func indexMiddleware(h gemini.Handler) gemini.Handler {
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
if strings.HasSuffix(r.URL.Path, "/") {
r.URL.Path += "index.gmi"
}
h.ServeGemini(ctx, rw, r)
})
}
func postsMiddleware(tplHandler gemini.Handler) gemini.Handler {
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
id := path.Base(r.URL.Path)
id = strings.TrimSuffix(id, ".gmi")
if id == "index" {
tplHandler.ServeGemini(ctx, rw, r)
return
}
query := r.URL.Query()
query.Set("id", id)
r.URL.RawQuery = query.Encode()
r.URL.Path = "/posts/post.gmi"
tplHandler.ServeGemini(ctx, rw, r)
})
}
func (a *api) assetsMiddleware() gemini.Handler {
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
id := path.Base(r.URL.Path)
mimeType := mime.TypeByExtension(path.Ext(id))
ctx = mctx.Annotate(ctx, "assetID", id, "mimeType", mimeType)
if mimeType != "" {
rw.SetMediaType(mimeType)
}
err := a.params.PostAssetStore.Get(id, rw)
if errors.Is(err, post.ErrAssetNotFound) {
rw.WriteHeader(gemini.StatusNotFound, "Asset not found, sorry!")
return
} else if err != nil {
a.params.Logger.Error(ctx, "error fetching asset", err)
rw.WriteHeader(gemini.StatusTemporaryFailure, err.Error())
return
}
})
}
func (a *api) handler() (gemini.Handler, error) {
tplHandler, err := a.tplHandler()
if err != nil {
return nil, fmt.Errorf("generating tpl handler: %w", err)
}
mux := new(gemini.Mux)
mux.Handle("/posts/", postsMiddleware(tplHandler))
mux.Handle("/assets/", a.assetsMiddleware())
mux.Handle("/", tplHandler)
var h gemini.Handler
h = mux
h = indexMiddleware(h)
// TODO logging
// TODO caching
return h, nil
}
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