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package redirector
import (
"embed"
"encoding/json"
"log"
"net/http"
"path"
"regexp"
"strings"
"text/template"
"go.awhk.org/core"
)
var DefaultTemplate = template.Must(template.ParseFS(fs, "*.tpl"))
var (
filter = core.FilterHTTPMethod(http.MethodGet)
//go:embed *.tpl
fs embed.FS
)
type Redirector struct {
Template *template.Template
Transformers []Transformer
}
func (h *Redirector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if filter(w, req) {
return
}
pkg := path.Join(req.Host, req.URL.Path)
for _, t := range h.Transformers {
if !t.Pattern.MatchString(pkg) {
continue
}
if req.URL.Query().Get("go-get") != "1" {
w.Header().Set("Location", "https://pkg.go.dev/"+pkg)
w.WriteHeader(http.StatusFound)
return
}
repo := t.Pattern.ReplaceAllString(pkg, t.Replacement)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
if err := h.Template.Execute(w, TemplateData{pkg, repo, t.VCS}); err != nil {
log.Println("Failed to execute template:", err)
}
return
}
w.WriteHeader(http.StatusNotFound)
}
type Pattern struct{ *regexp.Regexp }
func (pp *Pattern) UnmarshalJSON(data []byte) (err error) {
var s string
if err = json.Unmarshal(data, &s); err != nil {
return
}
pp.Regexp, err = regexp.Compile(strings.ReplaceAll(s, `\\`, `\`))
return
}
type TemplateData struct{ Package, Repository, VCS string }
type Transformer struct {
Pattern *Pattern `json:"pattern"`
Replacement string `json:"replacement"`
VCS string `json:"vcs"`
}
|
