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|
package hotline
import (
"bytes"
"crypto/rand"
"encoding/binary"
"sort"
)
type ThreadedNews struct {
Categories map[string]NewsCategoryListData15 `yaml:"Categories"`
}
type NewsCategoryListData15 struct {
Type []byte `yaml:"Type"` // Size 2 ; Bundle (2) or category (3)
Count []byte // Article or SubCategory count Size 2
NameSize byte
Name string `yaml:"Name"` //
Articles map[uint32]*NewsArtData `yaml:"Articles"` // Optional, if Type is Category
SubCats map[string]NewsCategoryListData15 `yaml:"SubCats"`
GUID []byte // Size 16
AddSN []byte // Size 4
DeleteSN []byte // Size 4
}
func (newscat *NewsCategoryListData15) GetNewsArtListData() NewsArtListData {
var newsArts []NewsArtList
var newsArtsPayload []byte
for i, art := range newscat.Articles {
ID := make([]byte, 4)
binary.BigEndian.PutUint32(ID, i)
newArt := NewsArtList{
ID: ID,
TimeStamp: art.Date,
ParentID: art.ParentArt,
Flags: []byte{0, 0, 0, 0},
FlavorCount: []byte{0, 0},
Title: []byte(art.Title),
Poster: []byte(art.Poster),
ArticleSize: art.DataSize(),
}
newsArts = append(newsArts, newArt)
}
sort.Sort(byID(newsArts))
for _, v := range newsArts {
newsArtsPayload = append(newsArtsPayload, v.Payload()...)
}
nald := NewsArtListData{
ID: []byte{0, 0, 0, 0},
Name: []byte{},
Description: []byte{},
NewsArtList: newsArtsPayload,
}
return nald
}
// NewsArtData represents single news article
type NewsArtData struct {
Title string `yaml:"Title"`
Poster string `yaml:"Poster"`
Date []byte `yaml:"Date"` // size 8
PrevArt []byte `yaml:"PrevArt"` // size 4
NextArt []byte `yaml:"NextArt"` // size 4
ParentArt []byte `yaml:"ParentArt"` // size 4
FirstChildArt []byte `yaml:"FirstChildArtArt"` // size 4
DataFlav []byte `yaml:"DataFlav"` // "text/plain"
Data string `yaml:"Data"`
}
func (art *NewsArtData) DataSize() []byte {
dataLen := make([]byte, 2)
binary.BigEndian.PutUint16(dataLen, uint16(len(art.Data)))
return dataLen
}
type NewsArtListData struct {
ID []byte `yaml:"ID"` // Size 4
Name []byte `yaml:"Name"`
Description []byte `yaml:"Description"` // not used?
NewsArtList []byte // List of articles Optional (if article count > 0)
}
func (nald *NewsArtListData) Payload() []byte {
count := make([]byte, 4)
binary.BigEndian.PutUint32(count, uint32(len(nald.NewsArtList)))
out := append(nald.ID, count...)
out = append(out, []byte{uint8(len(nald.Name))}...)
out = append(out, nald.Name...)
out = append(out, []byte{uint8(len(nald.Description))}...)
out = append(out, nald.Description...)
out = append(out, nald.NewsArtList...)
return out
}
// NewsArtList is a summarized version of a NewArtData record for display in list view
type NewsArtList struct {
ID []byte // Size 4
TimeStamp []byte // Year (2 bytes), milliseconds (2 bytes) and seconds (4 bytes)
ParentID []byte // Size 4
Flags []byte // Size 4
FlavorCount []byte // Size 2
// Title size 1
Title []byte // string
// Poster size 1
// Poster Poster string
Poster []byte
FlavorList []NewsFlavorList
// Flavor list… Optional (if flavor count > 0)
ArticleSize []byte // Size 2
}
type byID []NewsArtList
func (s byID) Len() int {
return len(s)
}
func (s byID) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s byID) Less(i, j int) bool {
return binary.BigEndian.Uint32(s[i].ID) < binary.BigEndian.Uint32(s[j].ID)
}
func (nal *NewsArtList) Payload() []byte {
out := append(nal.ID, nal.TimeStamp...)
out = append(out, nal.ParentID...)
out = append(out, nal.Flags...)
out = append(out, []byte{0, 1}...)
out = append(out, []byte{uint8(len(nal.Title))}...)
out = append(out, nal.Title...)
out = append(out, []byte{uint8(len(nal.Poster))}...)
out = append(out, nal.Poster...)
out = append(out, []byte{0x0a, 0x74, 0x65, 0x78, 0x74, 0x2f, 0x70, 0x6c, 0x61, 0x69, 0x6e}...) // TODO: wat?
out = append(out, nal.ArticleSize...)
return out
}
type NewsFlavorList struct {
// Flavor size 1
// Flavor text size MIME type string
// Article size 2
}
func (newscat *NewsCategoryListData15) MarshalBinary() (data []byte, err error) {
count := make([]byte, 2)
binary.BigEndian.PutUint16(count, uint16(len(newscat.Articles)+len(newscat.SubCats)))
out := append(newscat.Type, count...)
if bytes.Equal(newscat.Type, []byte{0, 3}) {
// Generate a random GUID // TODO: does this need to be random?
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
return data, err
}
out = append(out, b...) // GUID
out = append(out, []byte{0, 0, 0, 1}...) // Add SN (TODO: not sure what this is)
out = append(out, []byte{0, 0, 0, 2}...) // Delete SN (TODO: not sure what this is)
}
out = append(out, newscat.nameLen()...)
out = append(out, []byte(newscat.Name)...)
return out, err
}
// ReadNewsCategoryListData parses a byte slice into a NewsCategoryListData15 struct
// For use on the client side
func ReadNewsCategoryListData(payload []byte) NewsCategoryListData15 {
ncld := NewsCategoryListData15{
Type: payload[0:2],
Count: payload[2:4],
}
if bytes.Equal(ncld.Type, []byte{0, 3}) {
ncld.GUID = payload[4:20]
ncld.AddSN = payload[20:24]
ncld.AddSN = payload[24:28]
ncld.Name = string(payload[29:])
} else {
ncld.Name = string(payload[5:])
}
return ncld
}
func (newscat *NewsCategoryListData15) nameLen() []byte {
return []byte{uint8(len(newscat.Name))}
}
func ReadNewsPath(newsPath []byte) []string {
if len(newsPath) == 0 {
return []string{}
}
pathCount := binary.BigEndian.Uint16(newsPath[0:2])
pathData := newsPath[2:]
var paths []string
for i := uint16(0); i < pathCount; i++ {
pathLen := pathData[2]
paths = append(paths, string(pathData[3:3+pathLen]))
pathData = pathData[pathLen+3:]
}
return paths
}
func (s *Server) GetNewsCatByPath(paths []string) map[string]NewsCategoryListData15 {
cats := s.ThreadedNews.Categories
for _, path := range paths {
cats = cats[path].SubCats
}
return cats
}
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