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package main
import (
"bytes"
"embed"
"flag"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"strings"
"gopkg.in/yaml.v3"
)
//go:embed templates
var tpls embed.FS
type repository struct {
Name string `yaml:"name"`
Repo string `yaml:"repo"`
}
type config struct {
BaseUrl string `yaml:"baseUrl"`
VCS string `yaml:"vcs"`
Repositories []repository `yaml:"repositories"`
}
type moduleTmpl struct {
Name string
Repo string
VCS string
BaseUrl string
}
func main() {
flag.Parse()
cfg, err := loadConfig()
if err != nil {
log.Fatal(err)
}
http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
w.Write([]byte("ok"))
})
http.HandleFunc("/", goGet(cfg))
log.Printf("starting web server on :8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}
func loadConfig() (*config, error) {
configPath := "./vanity.yaml"
configYaml, err := ioutil.ReadFile(configPath)
if err != nil {
return nil, fmt.Errorf("failed to read configuration file %s: %v", configPath, err)
}
var cfg config
err = yaml.Unmarshal(configYaml, &cfg)
if err != nil {
return nil, fmt.Errorf("failed to unmarshall configuration: %v", err)
}
return &cfg, nil
}
func goGet(cfg *config) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
status := http.StatusMethodNotAllowed
http.Error(w, http.StatusText(status), status)
return
}
if r.FormValue("go-get") == "1" {
pathParts := strings.Split(r.URL.Path, "/")
for _, m := range cfg.Repositories {
if pathParts[1] == m.Name {
goGetModule(w, r, m, cfg)
return
}
}
status := http.StatusNotFound
http.Error(w, http.StatusText(status), status)
return
}
browserURL(w, r, cfg)
}
}
func goGetModule(w http.ResponseWriter, r *http.Request, m repository, cfg *config) {
tmpl, err := template.ParseFS(tpls, "templates/module.html.tpl")
if err != nil {
log.Fatal(err)
}
mod := moduleTmpl{
VCS: cfg.VCS,
BaseUrl: cfg.BaseUrl,
Name: m.Name,
Repo: m.Repo,
}
var buf bytes.Buffer
if err := tmpl.Execute(&buf, mod); err != nil {
log.Printf("error: %+v", err)
status := http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
} else {
w.Header().Set("Cache-Control", "no-store")
w.Write(buf.Bytes())
}
}
func browserURL(w http.ResponseWriter, r *http.Request, cfg *config) {
tmpl, err := template.ParseFS(tpls, "templates/index.html.tpl")
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
if err := tmpl.Execute(&buf, cfg); err != nil {
log.Printf("error: %+v", err)
status := http.StatusInternalServerError
http.Error(w, http.StatusText(status), status)
} else {
w.Header().Set("Cache-Control", "no-store")
w.Write(buf.Bytes())
}
}
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