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package main
import (
"crypto/sha1"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"regexp"
"sort"
)
type Storage struct {
Path string
}
var (
tokenPattern = regexp.MustCompile(`[a-fA-F0-9]{10,}`)
)
func (s *Storage) MustInit() error {
os.Mkdir(s.Path, 0755)
os.Mkdir(s.Path+"/battles", 0755)
os.Mkdir(s.Path+"/tokens", 0700)
return nil
}
func (s *Storage) CanPost(token string) (bool, error) {
if !tokenPattern.MatchString(token) {
return false, errors.New("invalid token")
}
_, err := os.Stat(s.Path + "/tokens/" + token)
return err == nil, nil
}
func (b *BattleStub) CalculateHash() string {
hash := sha1.New()
killmails := b.Killmails
sort.Slice(killmails, func(lhs, rhs int) bool {
return killmails[lhs].Id < killmails[rhs].Id
})
for _, km := range killmails {
fmt.Fprint(hash, km.Id)
}
sum := hash.Sum(nil)
return hex.EncodeToString(sum[:])
}
func (b *Battle) From(stub *BattleStub) error {
if len(stub.Killmails) < 1 {
return errors.New("missing killmails")
}
b.Id = stub.CalculateHash()
b.Ships = make(map[int32]Ship)
b.Locations = make(map[int32]Location)
b.Names = make(map[int32]string)
mark := func (id int32) { if id != 0 { b.Names[id] = "" } }
for _, km := range stub.Killmails {
details, err := GetKillmail(km.Id, km.Hash)
if err != nil {
return errors.New("could not retrieve killmail details")
}
details.Hash = km.Hash
b.Locations[details.SolarSystemId] = Location{}
b.Ships[details.Victim.ShipTypeId] = Ship{}
mark(details.Victim.CharacterId)
mark(details.Victim.CorporationId)
mark(details.Victim.AllianceId)
mark(details.Victim.FactionId)
if b.StartTime.IsZero() || b.StartTime.After(details.Time) {
b.StartTime = details.Time
}
if b.EndTime.IsZero() || b.EndTime.Before(details.Time) {
b.EndTime = details.Time
}
b.Killmails = append(b.Killmails, details)
}
b.Teams = stub.Teams
for key := range b.Ships {
t, err := GetType(key)
if err != nil {
return errors.New("could not retrieve type details")
}
g, err := GetGroup(t.GroupId)
if err != nil {
return errors.New("could not retrieve group details")
}
b.Ships[key] = Ship{Name: t.Name, Group: g.Name}
}
for key := range b.Locations {
s, err := GetSolarSystem(key)
if err != nil {
return errors.New("could not retrieve solar system details")
}
c, err := GetConstellation(s.ConstellationId)
if err != nil {
return errors.New("could not retrieve constellation details")
}
r, err := GetRegion(c.RegionId)
if err != nil {
return errors.New("could not retrieve region details")
}
b.Locations[key] = Location{
Name: s.Name,
Security: s.Security,
Position: s.Position,
Constellation: c.Name,
Region: r.Name,
}
if b.Name == "" {
b.Name = fmt.Sprintf("Fight in %s", s.Name)
} else {
b.Name = fmt.Sprintf("%s, %s", b.Name, s.Name)
}
}
// TODO: Resolve Names
return nil
}
func (s *Storage) LoadBattle(battle *Battle) error {
stream, err := os.Open(s.Path + "/battles/" + battle.Id)
if err != nil {
return err
}
decoder := json.NewDecoder(stream)
if err = decoder.Decode(battle); err != nil {
return err
}
return nil
}
func (s *Storage) AddBattle(battle *Battle) error {
data, err := json.Marshal(battle)
if err != nil {
return err
}
return ioutil.WriteFile(s.Path+"/battles/"+battle.Id, data, 0644)
}
func (s *Storage) ServeBattle(id string, w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
http.ServeFile(w, r, s.Path+"/battles/"+id)
}
func (s *Storage) ListRecentBattles(count int) ([]Battle, error) {
files, err := ioutil.ReadDir(s.Path + "/battles")
if err != nil {
return nil, err
}
sort.Slice(files, func(lhs, rhs int) bool {
return files[lhs].ModTime().After(files[rhs].ModTime())
})
battles := make([]Battle, 0, count)
for i := 0; i < count && i < len(files); i++ {
battle := Battle{Id: files[i].Name(), LastModified: files[i].ModTime()}
if err = s.LoadBattle(&battle); err != nil {
return nil, err
}
battles = append(battles, battle)
}
return battles, nil
}
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