vain/server.go

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package vain
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import (
"encoding/json"
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"fmt"
"net/http"
"strings"
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)
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type Server struct {
hostname string
storage *MemStore
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}
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func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
switch req.Method {
case "GET":
fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n")
for _, p := range s.storage.All() {
fmt.Fprintf(w, "%s\n", p)
}
fmt.Fprintf(w, "</head>\n</html>\n")
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case "POST":
if req.URL.Path == "/" {
http.Error(w, fmt.Sprintf("invalid path %q", req.URL.Path), http.StatusBadRequest)
return
}
p := Package{}
if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
http.Error(w, fmt.Sprintf("unable to parse json from body: %v", err), http.StatusInternalServerError)
return
}
p.Path = fmt.Sprintf("%s/%s", s.hostname, strings.Trim(req.URL.Path, "/"))
if !Valid(p.Path, s.storage.All()) {
http.Error(w, fmt.Sprintf("invalid path; prefix already taken %q", req.URL.Path), http.StatusConflict)
return
}
if err := s.storage.Add(p); err != nil {
http.Error(w, fmt.Sprintf("unable to add package: %v", err), http.StatusInternalServerError)
return
}
if err := s.storage.Save(); err != nil {
http.Error(w, fmt.Sprintf("unable to store db: %v", err), http.StatusInternalServerError)
if err := s.storage.Remove(p.Path); err != nil {
fmt.Fprintf(w, "to add insult to injury, could not delete package: %v\n", err)
}
return
}
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default:
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http.Error(w, fmt.Sprintf("unsupported method %q; accepted: POST, GET", req.Method), http.StatusMethodNotAllowed)
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}
}
func NewServer(sm *http.ServeMux, ms *MemStore, hostname string) *Server {
s := &Server{
storage: ms,
hostname: hostname,
}
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sm.Handle("/", s)
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return s
}