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// Package pkgserver implements the package metadata service backend.
package pkgserver
import (
"context"
"encoding/json"
"log"
"net/http"
"net/url"
"path"
"strconv"
"sync"
"time"
"hakurei.app/internal/info"
"hakurei.app/internal/rosa"
)
// for lazy initialisation of serveInfo
var (
infoPayload struct {
// Current package count.
Count int `json:"count"`
// Hakurei version, set at link time.
HakureiVersion string `json:"hakurei_version"`
}
infoPayloadOnce sync.Once
)
// handleInfo writes constant system information.
func handleInfo(w http.ResponseWriter, _ *http.Request) {
infoPayloadOnce.Do(func() {
infoPayload.Count = len(rosa.Collect())
infoPayload.HakureiVersion = info.Version()
})
// TODO(mae): cache entire response if no additional fields are planned
writeAPIPayload(w, infoPayload)
}
// newStatusHandler returns a [http.HandlerFunc] that offers status files for
// viewing or download, if available.
func (index *packageIndex) newStatusHandler(disposition bool) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
m, ok := index.names[path.Base(r.URL.Path)]
if !ok || !m.HasReport {
http.NotFound(w, r)
return
}
contentType := "text/plain; charset=utf-8"
if disposition {
contentType = "application/octet-stream"
// quoting like this is unsound, but okay, because metadata is hardcoded
contentDisposition := `attachment; filename="`
contentDisposition += m.Name + "-"
if m.Version != "" {
contentDisposition += m.Version + "-"
}
contentDisposition += m.ids + `.log"`
w.Header().Set("Content-Disposition", contentDisposition)
}
w.Header().Set("Content-Type", contentType)
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
if err := func() (err error) {
defer index.handleAccess(&err)()
_, err = w.Write(m.status)
return
}(); err != nil {
log.Println(err)
http.Error(
w, "cannot deliver status, contact maintainers",
http.StatusInternalServerError,
)
}
}
}
// handleGet writes a slice of metadata with specified order.
func (index *packageIndex) handleGet(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
limit, err := strconv.Atoi(q.Get("limit"))
if err != nil || limit > 100 || limit < 1 {
http.Error(
w, "limit must be an integer between 1 and 100",
http.StatusBadRequest,
)
return
}
i, err := strconv.Atoi(q.Get("index"))
if err != nil || i >= len(index.sorts[0]) || i < 0 {
http.Error(
w, "index must be an integer between 0 and "+
strconv.Itoa(len(index.sorts[0])-1),
http.StatusBadRequest,
)
return
}
sort, err := strconv.Atoi(q.Get("sort"))
if err != nil || sort >= len(index.sorts) || sort < 0 {
http.Error(
w, "sort must be an integer between 0 and "+
strconv.Itoa(sortOrderEnd),
http.StatusBadRequest,
)
return
}
values := index.sorts[sort][i:min(i+limit, len(index.sorts[sort]))]
writeAPIPayload(w, &struct {
Values []*metadata `json:"values"`
}{values})
}
func (index *packageIndex) handleSearch(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
limit, err := strconv.Atoi(q.Get("limit"))
if err != nil || limit > 100 || limit < 1 {
http.Error(
w, "limit must be an integer between 1 and 100",
http.StatusBadRequest,
)
return
}
i, err := strconv.Atoi(q.Get("index"))
if err != nil || i >= len(index.sorts[0]) || i < 0 {
http.Error(
w, "index must be an integer between 0 and "+
strconv.Itoa(len(index.sorts[0])-1),
http.StatusBadRequest,
)
return
}
search, err := url.QueryUnescape(q.Get("search"))
if len(search) > 100 || err != nil {
http.Error(
w, "search must be a string between 0 and 100 characters long",
http.StatusBadRequest,
)
return
}
desc := q.Get("desc") == "true"
n, res, err := index.performSearchQuery(limit, i, search, desc)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
writeAPIPayload(w, &struct {
Count int `json:"count"`
Values []searchResult `json:"values"`
}{n, res})
}
// apiVersion is the name of the current API revision, as part of the pattern.
const apiVersion = "v1"
// registerAPI registers API handler functions.
func (index *packageIndex) registerAPI(mux *http.ServeMux) {
mux.HandleFunc("GET /api/"+apiVersion+"/info", handleInfo)
mux.HandleFunc("GET /api/"+apiVersion+"/get", index.handleGet)
mux.HandleFunc("GET /api/"+apiVersion+"/search", index.handleSearch)
mux.HandleFunc("GET /api/"+apiVersion+"/status/", index.newStatusHandler(false))
mux.HandleFunc("GET /status/", index.newStatusHandler(true))
}
// Register arranges for mux to service API requests.
func Register(ctx context.Context, mux *http.ServeMux, report *rosa.Report) error {
var index packageIndex
index.search = make(searchCache)
if err := index.populate(report); err != nil {
return err
}
ticker := time.NewTicker(1 * time.Minute)
go func() {
for {
select {
case <-ctx.Done():
ticker.Stop()
return
case <-ticker.C:
index.search.clean()
}
}
}()
index.registerAPI(mux)
return nil
}
// writeAPIPayload sets headers common to API responses and encodes payload as
// JSON for the response body.
func writeAPIPayload(w http.ResponseWriter, payload any) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Expires", "0")
if err := json.NewEncoder(w).Encode(payload); err != nil {
log.Println(err)
http.Error(
w, "cannot encode payload, contact maintainers",
http.StatusInternalServerError,
)
}
}
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