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package main
import (
_ "embed"
"encoding/gob"
"io"
"log/slog"
"net/http"
"net/url"
"os"
"strings"
"sync"
)
//go:embed popup.html
var popup string
//go:embed notfound.html
var notfound string
//go:embed genericerror.html
var genericerror string
var migratedLock = sync.RWMutex{}
var migrated = map[string]struct{}{}
func migrate(id string) {
migratedLock.Lock()
migrated[id] = struct{}{}
migratedLock.Unlock()
slog.Info("Saving migrations", "id", id)
save()
}
func save() {
file, err := os.Create("migrated")
if err != nil {
slog.Warn("Could not create Migration-File", "err", err)
return
}
defer file.Close()
enc := gob.NewEncoder(file)
migratedLock.RLock()
defer migratedLock.RUnlock()
err = enc.Encode(migrated)
if err != nil {
slog.Warn("Could not encode migrations", "err", err)
return
}
}
func main() {
file, err := os.Open("migrated")
if err != nil {
slog.Warn("Could not open migration history", "err", err)
save()
} else {
dec := gob.NewDecoder(file)
dec.Decode(&migrated)
}
http.HandleFunc("GET /p/{id}", func(w http.ResponseWriter, r *http.Request) {
id := url.PathEscape(r.PathValue("id"))
migratedLock.RLock()
if _, ok := migrated[id]; ok {
migratedLock.RUnlock()
http.Redirect(w, r, "https://notes.stuve.fau.de/stuve-etherpad-migrated-"+id, 302)
return
}
migratedLock.RUnlock()
req, err := http.Get("http://127.0.0.1:9001/p/" + id + "/export/html")
if err != nil {
w.WriteHeader(502)
slog.Error("Could not fetch Pad as html", "err", err, "id", id)
w.Write([]byte(genericerror))
return
}
defer req.Body.Close()
if req.StatusCode == 404 {
w.WriteHeader(404)
slog.Error("Could not fetch Pad: 404", "id", id)
w.Write([]byte(notfound))
return
}
body, err := io.ReadAll(req.Body)
if req.StatusCode != 200 {
w.WriteHeader(req.StatusCode)
slog.Error("Could not fetch Pad", "id", id, "status", req.Status, "body", string(body))
w.Write([]byte(genericerror))
return
}
if err != nil {
w.WriteHeader(502)
slog.Error("Could not read entire body", "err", err, "id", id)
w.Write([]byte(genericerror))
return
}
w.Write([]byte(strings.Replace(string(body), "<body>", popup, 1)))
})
http.HandleFunc("POST /p/{id}", func(w http.ResponseWriter, r *http.Request) {
id := r.PathValue("id")
req, err := http.Get("http://127.0.0.1:9001/p/" + id + "/export/markdown")
if err != nil {
w.WriteHeader(502)
slog.Error("Could not fetch Pad as markdown", "err", err, "id", id)
w.Write([]byte(genericerror))
return
}
if req.StatusCode == 404 {
w.WriteHeader(404)
slog.Error("Could not fetch Pad: 404", "id", id)
w.Write([]byte(notfound))
return
}
if req.StatusCode != 200 {
body, err := io.ReadAll(req.Body)
w.WriteHeader(req.StatusCode)
slog.Error("Could not fetch Pad", "id", id, "status", req.Status, "body", string(body), "err", err)
w.Write([]byte(genericerror))
return
}
resp, err := http.Post("https://notes.stuve.fau.de/new/stuve-etherpad-migrated-"+id, "text/markdown", req.Body)
if resp.StatusCode != 200 {
body, err := io.ReadAll(resp.Body)
w.WriteHeader(req.StatusCode)
slog.Error("Could not Post Pad", "id", id, "status", req.Status, "body", string(body), "err", err)
w.Write([]byte(genericerror))
return
}
migrate(id)
http.Redirect(w, r, "https://notes.stuve.fau.de/stuve-etherpad-migrated-"+id, 302)
})
http.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {w.WriteHeader(204)})
err = http.ListenAndServe("[::]:8080", nil)
panic(err)
}
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