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gosora/common/parser.go

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package common
import (
"bytes"
//"fmt"
//"log"
"encoding/json"
"io/ioutil"
"net/url"
"os"
"regexp"
"strconv"
"strings"
"unicode/utf8"
)
// TODO: Somehow localise these?
var SpaceGap = []byte(" ")
var httpProtBytes = []byte("http://")
var DoubleForwardSlash = []byte("//")
var InvalidURL = []byte("<red>[Invalid URL]</red>")
var InvalidTopic = []byte("<red>[Invalid Topic]</red>")
var InvalidProfile = []byte("<red>[Invalid Profile]</red>")
var InvalidForum = []byte("<red>[Invalid Forum]</red>")
var unknownMedia = []byte("<red>[Unknown Media]</red>")
var URLOpen = []byte("<a href='")
var URLOpenUser = []byte("<a rel='ugc' href='")
var URLOpen2 = []byte("'>")
var bytesSinglequote = []byte("'")
var bytesGreaterthan = []byte(">")
var urlMention = []byte(" class='mention'")
var URLClose = []byte("</a>")
var imageOpen = []byte("<a href=\"")
var imageOpen2 = []byte("\"><img src='")
var imageClose = []byte("' class='postImage' /></a>")
var attachOpen = []byte("<a download class='attach' href=\"")
var attachClose = []byte("\">Attachment</a>")
var sidParam = []byte("?sid=")
var stypeParam = []byte("&amp;stype=")
var urlPattern = `(?s)([ {1}])((http|https|ftp|mailto)*)(:{??)\/\/([\.a-zA-Z\/]+)([ {1}])`
var urlReg *regexp.Regexp
func init() {
urlReg = regexp.MustCompile(urlPattern)
}
var emojis map[string]string
type emojiHolder struct {
Emojis []map[string]string `json:"emojis"`
}
func InitEmoji() error {
data, err := ioutil.ReadFile("./config/emoji_default.json")
if err != nil {
return err
}
var emoji emojiHolder
err = json.Unmarshal(data, &emoji)
if err != nil {
return err
}
emojis = make(map[string]string, len(emoji.Emojis))
for _, item := range emoji.Emojis {
for ikey, ival := range item {
emojis[ikey] = ival
}
}
data, err = ioutil.ReadFile("./config/emoji.json")
if err == os.ErrPermission || err == os.ErrClosed {
return err
} else if err != nil {
return nil
}
emoji = emojiHolder{}
err = json.Unmarshal(data, &emoji)
if err != nil {
return err
}
for _, item := range emoji.Emojis {
for ikey, ival := range item {
emojis[ikey] = ival
}
}
return nil
}
// TODO: Write a test for this
func shortcodeToUnicode(msg string) string {
//re := regexp.MustCompile(":(.):")
for shortcode, emoji := range emojis {
msg = strings.Replace(msg, shortcode, emoji, -1)
}
return msg
}
type TagToAction struct {
Suffix string
Do func(*TagToAction, bool, int, []rune) (int, string) // func(tagToAction,open,i,runes) (newI, output)
Depth int // For use by Do
PartialMode bool
}
// TODO: Write a test for this
func tryStepForward(i int, step int, runes []rune) (int, bool) {
i += step
if i < len(runes) {
return i, true
}
return i - step, false
}
// TODO: Write a test for this
func tryStepBackward(i int, step int, runes []rune) (int, bool) {
if i == 0 {
return i, false
}
return i - 1, true
}
// TODO: Preparse Markdown and normalize it into HTML?
func PreparseMessage(msg string) string {
// TODO: Kick this check down a level into SanitiseBody?
if !utf8.ValidString(msg) {
return ""
}
msg = strings.Replace(msg, "<p><br>", "\n\n", -1)
msg = strings.Replace(msg, "<p>", "\n\n", -1)
msg = strings.Replace(msg, "</p>", "", -1)
// TODO: Make this looser by moving it to the reverse HTML parser?
msg = strings.Replace(msg, "<br>", "\n\n", -1)
msg = strings.Replace(msg, "<br />", "\n\n", -1) // XHTML style
msg = strings.Replace(msg, "&nbsp;", "", -1)
msg = strings.Replace(msg, "\r", "", -1) // Windows artifact
//msg = strings.Replace(msg, "\n\n\n\n", "\n\n\n", -1)
msg = GetHookTable().Sshook("preparse_preassign", msg)
// There are a few useful cases for having spaces, but I'd like to stop the WYSIWYG from inserting random lines here and there
msg = SanitiseBody(msg)
var runes = []rune(msg)
msg = ""
// TODO: We can maybe reduce the size of this by using an offset?
// TODO: Move some of these closures out of this function to make things a little more efficient
var allowedTags = [][]string{
'e': []string{"m"},
's': []string{"", "trong", "pan"},
'd': []string{"el"},
'u': []string{""},
'b': []string{"", "lockquote"},
'i': []string{""},
'h': []string{"1", "2", "3"},
//'p': []string{""},
'g': []string{""}, // Quick and dirty fix for Grammarly
}
var buildLitMatch = func(tag string) func(*TagToAction, bool, int, []rune) (int, string) {
return func(action *TagToAction, open bool, _ int, _ []rune) (int, string) {
if open {
action.Depth++
return -1, "<" + tag + ">"
}
if action.Depth <= 0 {
return -1, ""
}
action.Depth--
return -1, "</" + tag + ">"
}
}
var tagToAction = [][]*TagToAction{
'e': []*TagToAction{&TagToAction{"m", buildLitMatch("em"), 0, false}},
's': []*TagToAction{
&TagToAction{"", buildLitMatch("del"), 0, false},
&TagToAction{"trong", buildLitMatch("strong"), 0, false},
// Hides the span tags Trumbowyg loves blasting out randomly
&TagToAction{"pan", func(act *TagToAction, open bool, i int, runes []rune) (int, string) {
if open {
act.Depth++
//fmt.Println("skipping attributes")
for ; i < len(runes); i++ {
if runes[i] == '&' && peekMatch(i, "gt;", runes) {
//fmt.Println("found tag exit")
return i + 3, " "
}
}
return -1, " "
}
if act.Depth <= 0 {
return -1, " "
}
act.Depth--
return -1, " "
}, 0, true},
},
'd': []*TagToAction{&TagToAction{"el", buildLitMatch("del"), 0, false}},
'u': []*TagToAction{&TagToAction{"", buildLitMatch("u"), 0, false}},
'b': []*TagToAction{
&TagToAction{"", buildLitMatch("strong"), 0, false},
&TagToAction{"lockquote", buildLitMatch("blockquote"), 0, false},
},
'i': []*TagToAction{&TagToAction{"", buildLitMatch("em"), 0, false}},
'h': []*TagToAction{
&TagToAction{"1", buildLitMatch("h2"), 0, false},
&TagToAction{"2", buildLitMatch("h3"), 0, false},
&TagToAction{"3", buildLitMatch("h4"), 0, false},
},
//'p': []*TagToAction{&TagToAction{"", buildLitMatch2("\n\n", ""), 0, false}},
'g': []*TagToAction{
&TagToAction{"", func(act *TagToAction, open bool, i int, runes []rune) (int, string) {
if open {
act.Depth++
//fmt.Println("skipping attributes")
for ; i < len(runes); i++ {
if runes[i] == '&' && peekMatch(i, "gt;", runes) {
//fmt.Println("found tag exit")
return i + 3, " "
}
}
return -1, " "
}
if act.Depth <= 0 {
return -1, " "
}
act.Depth--
return -1, " "
}, 0, true},
},
}
// TODO: Implement a less literal parser
for i := 0; i < len(runes); i++ {
char := runes[i]
// TODO: Make the slashes escapable too in case someone means to use a literaly slash, maybe as an example of how to escape elements?
if char == '\\' {
if peekMatch(i, "&lt;", runes) {
msg += "&"
i++
}
} else if char == '&' && peekMatch(i, "lt;", runes) {
var ok bool
i, ok = tryStepForward(i, 4, runes)
if !ok {
msg += "&lt;"
break
}
char := runes[i]
if int(char) >= len(allowedTags) {
//fmt.Println("sentinel char out of bounds")
msg += "&"
i -= 4
continue
}
var closeTag bool
if char == '/' {
//fmt.Println("found close tag")
i, ok = tryStepForward(i, 1, runes)
if !ok {
msg += "&lt;/"
break
}
char = runes[i]
closeTag = true
}
tags := allowedTags[char]
if len(tags) == 0 {
//fmt.Println("couldn't find char in allowedTags")
msg += "&"
if closeTag {
//msg += "&lt;/"
//msg += "&"
i -= 5
} else {
//msg += "&"
i -= 4
}
continue
}
// TODO: Scan through tags and make sure the suffix is present to reduce the number of false positives which hit the loop below
//fmt.Printf("tags: %+v\n", tags)
newI := -1
var out string
toActionList := tagToAction[char]
for _, toAction := range toActionList {
// TODO: Optimise this, maybe with goto or a function call to avoid scanning the text twice?
if (toAction.PartialMode && !closeTag && peekMatch(i, toAction.Suffix, runes)) || peekMatch(i, toAction.Suffix+"&gt;", runes) {
newI, out = toAction.Do(toAction, !closeTag, i, runes)
if newI != -1 {
i = newI
} else if out != "" {
i += len(toAction.Suffix + "&gt;")
}
break
}
}
if out == "" {
msg += "&"
if closeTag {
i -= 5
} else {
i -= 4
}
} else if out != " " {
msg += out
}
} else if char == '@' && (i == 0 || runes[i-1] < 33) {
// TODO: Handle usernames containing spaces, maybe in the front-end with AJAX
// Do not mention-ify ridiculously long things
var ok bool
i, ok = tryStepForward(i, 1, runes)
if !ok {
msg += "@"
continue
}
start := i
for j := 0; i < len(runes) && j < Config.MaxUsernameLength; j++ {
cchar := runes[i]
if cchar < 33 {
break
}
i++
}
username := string(runes[start:i])
if username == "" {
msg += "@"
i = start - 1
continue
}
user, err := Users.GetByName(username)
if err != nil {
if err != ErrNoRows {
LogError(err)
}
msg += "@"
i = start - 1
continue
}
msg += "@" + strconv.Itoa(user.ID)
i--
} else {
msg += string(char)
}
}
for _, actionList := range tagToAction {
for _, toAction := range actionList {
if toAction.Depth > 0 {
for ; toAction.Depth > 0; toAction.Depth-- {
_, out := toAction.Do(toAction, false, len(runes), runes)
if out != "" {
msg += out
}
}
}
}
}
return strings.TrimSpace(shortcodeToUnicode(msg))
}
// TODO: Test this
// TODO: Use this elsewhere in the parser?
func peek(cur int, skip int, runes []rune) rune {
if (cur + skip) < len(runes) {
return runes[cur+skip]
}
return 0 // null byte
}
// TODO: Test this
func peekMatch(cur int, phrase string, runes []rune) bool {
if cur+len(phrase) > len(runes) {
return false
}
for i, char := range phrase {
if cur+i+1 >= len(runes) {
return false
}
if runes[cur+i+1] != char {
return false
}
}
return true
}
// ! Not concurrency safe
func AddHashLinkType(prefix string, handler func(*strings.Builder, string, *int)) {
// There can only be one hash link type starting with a specific character at the moment
hashType := hashLinkTypes[prefix[0]]
if hashType != "" {
return
}
hashLinkMap[prefix] = handler
hashLinkTypes[prefix[0]] = prefix
}
func WriteURL(sb *strings.Builder, url string, label string) {
sb.Write(URLOpen)
sb.WriteString(url)
sb.Write(URLOpen2)
sb.WriteString(label)
sb.Write(URLClose)
}
var hashLinkTypes = []string{'t': "tid-", 'r': "rid-", 'f': "fid-"}
var hashLinkMap = map[string]func(*strings.Builder, string, *int){
"tid-": func(sb *strings.Builder, msg string, i *int) {
tid, intLen := CoerceIntString(msg[*i:])
*i += intLen
topic, err := Topics.Get(tid)
if err != nil || !Forums.Exists(topic.ParentID) {
sb.Write(InvalidTopic)
return
}
WriteURL(sb, BuildTopicURL("", tid), "#tid-"+strconv.Itoa(tid))
},
"rid-": func(sb *strings.Builder, msg string, i *int) {
rid, intLen := CoerceIntString(msg[*i:])
*i += intLen
topic, err := TopicByReplyID(rid)
if err != nil || !Forums.Exists(topic.ParentID) {
sb.Write(InvalidTopic)
return
}
// TODO: Send the user to the right page and post not just the right topic?
WriteURL(sb, BuildTopicURL("", topic.ID), "#rid-"+strconv.Itoa(rid))
},
"fid-": func(sb *strings.Builder, msg string, i *int) {
fid, intLen := CoerceIntString(msg[*i:])
*i += intLen
if !Forums.Exists(fid) {
sb.Write(InvalidForum)
return
}
WriteURL(sb, BuildForumURL("", fid), "#fid-"+strconv.Itoa(fid))
},
// TODO: Forum Shortcode Link
}
// TODO: Write a test for this
// TODO: We need a lot more hooks here. E.g. To add custom media types and handlers.
// TODO: Use templates to reduce the amount of boilerplate?
func ParseMessage(msg string, sectionID int, sectionType string /*, user User*/) string {
// TODO: Word boundary detection for these to avoid mangling code
msg = strings.Replace(msg, ":)", "😀", -1)
msg = strings.Replace(msg, ":(", "😞", -1)
msg = strings.Replace(msg, ":D", "😃", -1)
msg = strings.Replace(msg, ":P", "😛", -1)
msg = strings.Replace(msg, ":O", "😲", -1)
msg = strings.Replace(msg, ":p", "😛", -1)
msg = strings.Replace(msg, ":o", "😲", -1)
msg = strings.Replace(msg, ";)", "😉", -1)
// Word filter list. E.g. Swear words and other things the admins don't like
wordFilters, err := WordFilters.GetAll()
if err != nil {
LogError(err)
return ""
}
for _, filter := range wordFilters {
msg = strings.Replace(msg, filter.Find, filter.Replacement, -1)
}
// Search for URLs, mentions and hashlinks in the messages...
var sb strings.Builder
lastItem := 0
i := 0
//var c bool
//fmt.Println("msg:", "'"+msg+"'")
for ; len(msg) > i; i++ {
//fmt.Printf("msg[%d]: %s\n",i,string(msg[i]))
if (i == 0 && (msg[0] > 32)) || (len(msg) > (i+1) && (msg[i] < 33) && (msg[i+1] > 32)) {
//fmt.Println("s1")
if (i != 0) || msg[i] < 33 {
i++
}
if len(msg) <= (i + 1) {
break
}
//fmt.Println("s2")
if msg[i] == '#' {
//fmt.Println("msg[i+1]:", msg[i+1])
//fmt.Println("string(msg[i+1]):", string(msg[i+1]))
hashType := hashLinkTypes[msg[i+1]]
if hashType == "" {
//fmt.Println("uh1")
sb.WriteString(msg[lastItem:i])
i++
lastItem = i
continue
}
//fmt.Println("hashType:", hashType)
if len(msg) <= (i + len(hashType) + 1) {
sb.WriteString(msg[lastItem:i])
lastItem = i
continue
}
if msg[i+1:i+len(hashType)+1] != hashType {
continue
}
//fmt.Println("msg[lastItem:i]:", msg[lastItem:i])
sb.WriteString(msg[lastItem:i])
i += len(hashType) + 1
hashLinkMap[hashType](&sb, msg, &i)
lastItem = i
i--
} else if msg[i] == '@' {
sb.WriteString(msg[lastItem:i])
i++
start := i
uid, intLen := CoerceIntString(msg[start:])
i += intLen
menUser, err := Users.Get(uid)
if err != nil {
sb.Write(InvalidProfile)
lastItem = i
i--
continue
}
sb.Write(URLOpen)
sb.WriteString(menUser.Link)
sb.Write(bytesSinglequote)
sb.Write(urlMention)
sb.Write(bytesGreaterthan)
sb.WriteByte('@')
sb.WriteString(menUser.Name)
sb.Write(URLClose)
lastItem = i
i--
} else if msg[i] == 'h' || msg[i] == 'f' || msg[i] == 'g' || msg[i] == '/' {
//fmt.Println("s3")
if len(msg) > i+3 && msg[i+1] == 't' && msg[i+2] == 't' && msg[i+3] == 'p' {
if len(msg) > i+6 && msg[i+4] == 's' && msg[i+5] == ':' && msg[i+6] == '/' {
// Do nothing
} else if len(msg) > i+5 && msg[i+4] == ':' && msg[i+5] == '/' {
// Do nothing
} else {
continue
}
} else if len(msg) > i+4 && msg[i+1] == 't' && msg[i+2] == 'p' && msg[i+3] == ':' && msg[i+4] == '/' {
// Do nothing
} else if len(msg) > i+4 && msg[i+1] == 'i' && msg[i+2] == 't' && msg[i+3] == ':' && msg[i+4] == '/' {
// Do nothing
} else if msg[i+1] == '/' {
// Do nothing
} else {
continue
}
//fmt.Println("p1:",i)
sb.WriteString(msg[lastItem:i])
urlLen, ok := PartialURLStringLen(msg[i:])
if len(msg) < i+urlLen {
//fmt.Println("o1")
if urlLen == 2 {
sb.Write(DoubleForwardSlash)
} else {
sb.Write(InvalidURL)
}
i += len(msg) - 1
lastItem = i
break
}
if urlLen == 2 {
sb.Write(DoubleForwardSlash)
i += urlLen
lastItem = i
i--
continue
}
//fmt.Println("msg[i:i+urlLen]:", "'"+msg[i:i+urlLen]+"'")
if !ok {
//fmt.Printf("o2: i = %d; i+urlLen = %d\n",i,i+urlLen)
sb.Write(InvalidURL)
i += urlLen
lastItem = i
i--
continue
}
media, ok := parseMediaString(msg[i : i+urlLen])
if !ok {
//fmt.Println("o3")
sb.Write(InvalidURL)
i += urlLen
lastItem = i
continue
}
//fmt.Println("p2")
addImage := func(url string) {
sb.Grow(len(imageOpen) + len(url) + len(url) + len(imageOpen2) + len(imageClose))
sb.Write(imageOpen)
sb.WriteString(url)
sb.Write(imageOpen2)
sb.WriteString(url)
sb.Write(imageClose)
i += urlLen
lastItem = i
}
// TODO: Reduce the amount of code duplication
// TODO: Avoid allocating a string for media.Type?
if media.Type == "attach" {
addImage(media.URL + "?sid=" + strconv.Itoa(sectionID) + "&amp;stype=" + sectionType)
continue
} else if media.Type == "image" {
addImage(media.URL)
continue
} else if media.Type == "aother" {
sb.Write(attachOpen)
sb.WriteString(media.URL)
sb.Write(sidParam)
sb.WriteString(strconv.Itoa(sectionID))
sb.Write(stypeParam)
sb.WriteString(sectionType)
sb.Write(attachClose)
i += urlLen
lastItem = i
continue
} else if media.Type == "raw" {
sb.WriteString(media.Body)
i += urlLen
lastItem = i
continue
} else if media.Type != "" {
sb.Write(unknownMedia)
i += urlLen
continue
}
//fmt.Println("p3")
// TODO: Add support for rel="ugc"
sb.Grow(len(URLOpen) + (len(msg[i:i+urlLen]) * 2) + len(URLOpen2) + len(URLClose))
if media.Trusted {
sb.Write(URLOpen)
} else {
sb.Write(URLOpenUser)
}
sb.WriteString(media.URL)
sb.Write(URLOpen2)
sb.WriteString(media.FURL)
sb.Write(URLClose)
i += urlLen
lastItem = i
i--
}
}
}
if lastItem != i && sb.Len() != 0 {
/*calclen := len(msg)
if calclen <= lastItem {
calclen = lastItem
}*/
//if i == len(msg) {
sb.WriteString(msg[lastItem:])
/*} else {
sb.WriteString(msg[lastItem:calclen])
}*/
}
if sb.Len() != 0 {
msg = sb.String()
//fmt.Println("sb.String():", "'"+sb.String()+"'")
}
msg = strings.Replace(msg, "\n", "<br>", -1)
msg = GetHookTable().Sshook("parse_assign", msg)
return msg
}
// 6, 7, 8, 6, 2, 7
// ftp://, http://, https:// git://, //, mailto: (not a URL, just here for length comparison purposes)
// TODO: Write a test for this
func validateURLString(data string) bool {
i := 0
if len(data) >= 6 {
if data[0:6] == "ftp://" || data[0:6] == "git://" {
i = 6
} else if len(data) >= 7 && data[0:7] == "http://" {
i = 7
} else if len(data) >= 8 && data[0:8] == "https://" {
i = 8
}
} else if len(data) >= 2 && data[0] == '/' && data[1] == '/' {
i = 2
}
// ? - There should only be one : and that's only if the URL is on a non-standard port. Same for ?s.
for ; len(data) > i; i++ {
ch := data[i] // char
if ch != '\\' && ch != '_' && ch != ':' && ch != '?' && ch != '&' && ch != '=' && ch != ';' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 58) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 90 is Z, 91 is [
return false
}
}
return true
}
// TODO: Write a test for this
func validatedURLBytes(data []byte) (url []byte) {
datalen := len(data)
i := 0
if datalen >= 6 {
if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
i = 6
} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
i = 7
} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
i = 8
}
} else if datalen >= 2 && data[0] == '/' && data[1] == '/' {
i = 2
}
// ? - There should only be one : and that's only if the URL is on a non-standard port. Same for ?s.
for ; datalen > i; i++ {
ch := data[i] //char
if ch != '\\' && ch != '_' && ch != ':' && ch != '?' && ch != '&' && ch != '=' && ch != ';' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 58) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 90 is Z, 91 is [
return InvalidURL
}
}
url = append(url, data...)
return url
}
// TODO: Write a test for this
func PartialURLString(data string) (url []byte) {
i := 0
end := len(data) - 1
if len(data) >= 6 {
if data[0:6] == "ftp://" || data[0:6] == "git://" {
i = 6
} else if len(data) >= 7 && data[0:7] == "http://" {
i = 7
} else if len(data) >= 8 && data[0:8] == "https://" {
i = 8
}
} else if len(data) >= 2 && data[0] == '/' && data[1] == '/' {
i = 2
}
// ? - There should only be one : and that's only if the URL is on a non-standard port. Same for ?s.
for ; end >= i; i++ {
ch := data[i] // char
if ch != '\\' && ch != '_' && ch != ':' && ch != '?' && ch != '&' && ch != '=' && ch != ';' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 58) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 90 is Z, 91 is [
end = i
}
}
url = append(url, []byte(data[0:end])...)
return url
}
// TODO: Write a test for this
// TODO: Handle the host bits differently from the paths...
func PartialURLStringLen(data string) (int, bool) {
i := 0
if len(data) >= 6 {
//log.Print(string(data[0:5]))
if data[0:6] == "ftp://" || data[0:6] == "git://" {
i = 6
} else if len(data) >= 7 && data[0:7] == "http://" {
i = 7
} else if len(data) >= 8 && data[0:8] == "https://" {
i = 8
}
} else if len(data) >= 2 && data[0] == '/' && data[1] == '/' {
i = 2
}
//fmt.Println("Data Length: ",len(data))
if len(data) < i {
//fmt.Println("e1:",i)
return i + 1, false
}
// ? - There should only be one : and that's only if the URL is on a non-standard port. Same for ?s.
f := i
//fmt.Println("f:",f)
for ; len(data) > i; i++ {
ch := data[i] //char
if ch < 33 { // space and invisibles
//fmt.Println("e2:",i)
return i, i != f
} else if ch != '\\' && ch != '_' && ch != ':' && ch != '?' && ch != '&' && ch != '=' && ch != ';' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 58) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 90 is Z, 91 is [
//log.Print("Bad Character: ", ch)
//fmt.Println("e3")
return i, false
}
}
//fmt.Println("e4:", i)
/*if data[i-1] < 33 {
return i-1, i != f
}*/
//fmt.Println("e5")
return i, i != f
}
// TODO: Write a test for this
// TODO: Get this to support IPv6 hosts, this isn't currently done as this is used in the bbcode plugin where it thinks the [ is a IPv6 host
func PartialURLStringLen2(data string) int {
i := 0
if len(data) >= 6 {
//log.Print(string(data[0:5]))
if data[0:6] == "ftp://" || data[0:6] == "git://" {
i = 6
} else if len(data) >= 7 && data[0:7] == "http://" {
i = 7
} else if len(data) >= 8 && data[0:8] == "https://" {
i = 8
}
} else if len(data) >= 2 && data[0] == '/' && data[1] == '/' {
i = 2
}
// ? - There should only be one : and that's only if the URL is on a non-standard port. Same for ?s.
for ; len(data) > i; i++ {
ch := data[i] //char
if ch != '\\' && ch != '_' && ch != ':' && ch != '?' && ch != '&' && ch != '=' && ch != ';' && ch != '@' && ch != '#' && !(ch > 44 && ch < 58) && !(ch > 64 && ch < 91) && !(ch > 96 && ch < 123) { // 90 is Z, 91 is [
//log.Print("Bad Character: ", ch)
return i
}
}
//log.Print("Data Length: ",len(data))
return len(data)
}
type MediaEmbed struct {
Type string //image
URL string
FURL string
Body string
Trusted bool // samesite urls
}
// TODO: Write a test for this
func parseMediaString(data string) (media MediaEmbed, ok bool) {
if !validateURLString(data) {
return media, false
}
uurl, err := url.Parse(data)
if err != nil {
return media, false
}
host := uurl.Hostname()
scheme := uurl.Scheme
port := uurl.Port()
query, err := url.ParseQuery(uurl.RawQuery)
if err != nil {
return media, false
}
//fmt.Println("host:", host)
//log.Print("Site.URL:",Site.URL)
samesite := host == "localhost" || host == "127.0.0.1" || host == "::1" || host == Site.URL
if samesite {
host = strings.Split(Site.URL, ":")[0]
// ?- Test this as I'm not sure it'll do what it should. If someone's running SSL on port 80 or non-SSL on port 443 then... Well... They're in far worse trouble than this...
port = Site.Port
if Config.SslSchema {
scheme = "https"
}
}
if scheme != "" {
scheme += ":"
}
media.Trusted = samesite
path := uurl.EscapedPath()
pathFrags := strings.Split(path, "/")
if len(pathFrags) >= 2 {
if samesite && pathFrags[1] == "attachs" && (scheme == "http:" || scheme == "https:") {
var sport string
// ? - Assumes the sysadmin hasn't mixed up the two standard ports
if port != "443" && port != "80" && port != "" {
sport = ":" + port
}
media.URL = scheme + "//" + host + sport + path
extarr := strings.Split(path, ".")
if len(extarr) == 0 {
// TODO: Write a unit test for this
return media, false
}
ext := extarr[len(extarr)-1]
if ImageFileExts.Contains(ext) {
media.Type = "attach"
} else {
media.Type = "aother"
}
return media, true
}
}
// ? - I don't think this hostname will hit every YT domain
// TODO: Make this a more customisable handler rather than hard-coding it in here
if strings.HasSuffix(host, ".youtube.com") && path == "/watch" {
video, ok := query["v"]
if ok && len(video) >= 1 && video[0] != "" {
media.Type = "raw"
// TODO: Filter the URL to make sure no nasties end up in there
media.Body = "<iframe class='postIframe' src='https://www.youtube-nocookie.com/embed/" + video[0] + "' frameborder=0 allowfullscreen></iframe>"
return media, true
}
}
if lastFrag := pathFrags[len(pathFrags)-1]; lastFrag != "" {
// TODO: Write a function for getting the file extension of a string
if extarr := strings.Split(lastFrag, "."); len(extarr) >= 2 {
ext := extarr[len(extarr)-1]
if ImageFileExts.Contains(ext) {
media.Type = "image"
var sport string
if port != "443" && port != "80" && port != "" {
sport = ":" + port
}
media.URL = scheme + "//" + host + sport + path
return media, true
}
}
}
var sport string
if port != "443" && port != "80" && port != "" {
sport = ":" + port
}
var q string
if len(uurl.RawQuery) > 0 {
q = "?" + uurl.RawQuery
}
var frag string
if len(uurl.Fragment) > 0 {
frag = "#" + uurl.Fragment
}
media.URL = scheme + "//" + host + sport + path + q + frag
media.FURL = host + sport + path + q + frag
return media, true
}
// TODO: Write a test for this
func CoerceIntString(data string) (res int, length int) {
if !(data[0] > 47 && data[0] < 58) {
return 0, 1
}
i := 0
for ; len(data) > i; i++ {
if !(data[i] > 47 && data[i] < 58) {
conv, err := strconv.Atoi(data[0:i])
if err != nil {
return 0, i
}
return conv, i
}
}
conv, err := strconv.Atoi(data)
if err != nil {
return 0, i
}
return conv, i
}
// TODO: Write tests for this
// Make sure we reflect changes to this in the JS port in /public/global.js
func Paginate(currentPage int, lastPage int, maxPages int) (out []int) {
diff := lastPage - currentPage
pre := 3
if diff < 3 {
pre = maxPages - diff
}
page := currentPage - pre
if page < 0 {
page = 0
}
for len(out) < maxPages && page < lastPage {
page++
out = append(out, page)
}
return out
}
// TODO: Write tests for this
// Make sure we reflect changes to this in the JS port in /public/global.js
func PageOffset(count int, page int, perPage int) (int, int, int) {
var offset int
lastPage := LastPage(count, perPage)
if page > 1 {
offset = (perPage * page) - perPage
} else if page == -1 {
page = lastPage
offset = (perPage * page) - perPage
} else {
page = 1
}
// ? - This has been commented out as it created a bug in the user manager where the first user on a page wouldn't be accessible
// We don't want the offset to overflow the slices, if everything's in memory
/*if offset >= (count - 1) {
offset = 0
}*/
return offset, page, lastPage
}
// TODO: Write tests for this
// Make sure we reflect changes to this in the JS port in /public/global.js
func LastPage(count int, perPage int) int {
return (count / perPage) + 1
}
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