package common import ( "bytes" //"fmt" //"log" "encoding/json" "io/ioutil" "net/url" "os" "path/filepath" "regexp" "strconv" "strings" "unicode/utf8" ) // TODO: Somehow localise these? var SpaceGap = []byte(" ") var httpProtBytes = []byte("http://") var DoubleForwardSlash = []byte("//") var InvalidURL = []byte("[Invalid URL]") var InvalidTopic = []byte("[Invalid Topic]") var InvalidProfile = []byte("[Invalid Profile]") var InvalidForum = []byte("[Invalid Forum]") var unknownMedia = []byte("[Unknown Media]") var URLOpen = []byte("") var bytesSinglequote = []byte("'") var bytesGreaterThan = []byte(">") var urlMention = []byte("'class='mention'") var URLClose = []byte("") var videoOpen = []byte("") var audioOpen = []byte("") var imageOpen = []byte("") var attachOpen = []byte("Attachment") var sidParam = []byte("?sid=") var stypeParam = []byte("&stype=") var urlPattern = `(?s)([ {1}])((http|https|ftp|mailto)*)(:{??)\/\/([\.a-zA-Z\/]+)([ {1}])` var urlReg *regexp.Regexp const imageSizeHint = len("") const videoSizeHint = len("") + len("?sid=") + len("&stype=") + 8 const audioSizeHint = len("") + len("?sid=") + len("&stype=") + 8 const mentionSizeHint = len("@") + len("") 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, 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, 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, "


", "\n\n", -1) msg = strings.Replace(msg, "

", "\n\n", -1) msg = strings.Replace(msg, "

", "", -1) // TODO: Make this looser by moving it to the reverse HTML parser? msg = strings.Replace(msg, "
", "\n\n", -1) msg = strings.Replace(msg, "
", "\n\n", -1) // XHTML style msg = strings.Replace(msg, " ", "", -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) 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 allowedTags := [][]string{ 'e': []string{"m"}, 's': []string{"", "trong", "poiler", "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 } 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, "" } } tagToAction := [][]*TagToAction{ 'e': []*TagToAction{&TagToAction{"m", buildLitMatch("em"), 0, false}}, 's': []*TagToAction{ &TagToAction{"", buildLitMatch("del"), 0, false}, &TagToAction{"trong", buildLitMatch("strong"), 0, false}, &TagToAction{"poiler", buildLitMatch("spoiler"), 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, "<", runes) { msg += "&" i++ } } else if char == '&' && peekMatch(i, "lt;", runes) { var ok bool i, ok = tryStepForward(i, 4, runes) if !ok { msg += "<" 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 += "</" 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 += "</" //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+">", runes) { newI, out = toAction.Do(toAction, !closeTag, i, runes) if newI != -1 { i = newI } else if out != "" { i += len(toAction.Suffix + ">") } 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, 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, h 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] = h hashLinkTypes[prefix[0]] = prefix } func WriteURL(sb *strings.Builder, url, 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: Pack multiple bit flags into an integer instead of using a struct? var DefaultParseSettings = &ParseSettings{} type ParseSettings struct { NoEmbed bool } func (ps *ParseSettings) CopyPtr() *ParseSettings { n := &ParseSettings{} *n = *ps return n } // 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, settings *ParseSettings, user *User) string { if settings == nil { settings = DefaultParseSettings } if user == nil { user = &GuestUser } // TODO: Word boundary detection for these to avoid mangling code rep := func(find, replace string) { msg = strings.Replace(msg, find, replace, -1) } rep(":)", "😀") rep(":(", "😞") rep(":D", "😃") rep(":P", "😛") rep(":O", "😲") rep(":p", "😛") rep(":o", "😲") rep(";)", "😉") // 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 _, f := range wordFilters { msg = strings.Replace(msg, f.Find, f.Replace, -1) } if len(msg) < 2 { msg = strings.Replace(msg, "\n", "
", -1) msg = GetHookTable().Sshook("parse_assign", msg) return msg } // 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") ch := msg[i] switch ch { case '#': //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-- case '@': sb.WriteString(msg[lastItem:i]) i++ start := i uid, intLen := CoerceIntString(msg[start:]) i += intLen var menUser *User if uid != 0 && user.ID == uid { menUser = user } else { menUser = Users.Getn(uid) if menUser == nil { sb.Write(InvalidProfile) lastItem = i i-- continue } } sb.Grow(mentionSizeHint + len(menUser.Link) + len(menUser.Name)) sb.Write(URLOpen) sb.WriteString(menUser.Link) sb.Write(urlMention) sb.Write(bytesGreaterThan) sb.WriteByte('@') sb.WriteString(menUser.Name) sb.Write(URLClose) lastItem = i i-- case 'h', 'f', 'g', '/': //fmt.Println("s3") if len(msg) > i+5 && 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 msg[i+4] == ':' && msg[i+5] == '/' { // Do nothing } else { continue } } else if len(msg) > i+4 { fch := msg[i+1] if fch == 't' && msg[i+2] == 'p' && msg[i+3] == ':' && msg[i+4] == '/' { // Do nothing } else if fch == 'i' && msg[i+2] == 't' && msg[i+3] == ':' && msg[i+4] == '/' { // Do nothing } else if fch == '/' { // Do nothing } else { continue } } 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], settings) if !ok { //fmt.Println("o3") sb.Write(InvalidURL) i += urlLen lastItem = i continue } //fmt.Println("p2") addImage := func(url string) { sb.Grow(imageSizeHint + len(url) + len(url)) 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? switch media.Type { case AImage: addImage(media.URL + "?sid=" + strconv.Itoa(sectionID) + "&stype=" + sectionType) continue case AVideo: sb.Grow(videoSizeHint + (len(media.URL) + len(sectionType)*2)) sb.Write(videoOpen) sb.WriteString(media.URL) sb.Write(sidParam) sb.WriteString(strconv.Itoa(sectionID)) sb.Write(stypeParam) sb.WriteString(sectionType) sb.Write(videoOpen2) sb.WriteString(media.URL) sb.Write(sidParam) sb.WriteString(strconv.Itoa(sectionID)) sb.Write(stypeParam) sb.WriteString(sectionType) sb.Write(videoClose) i += urlLen lastItem = i continue case AAudio: sb.Grow(audioSizeHint + (len(media.URL) + len(sectionType)*2)) sb.Write(audioOpen) sb.WriteString(media.URL) sb.Write(sidParam) sb.WriteString(strconv.Itoa(sectionID)) sb.Write(stypeParam) sb.WriteString(sectionType) sb.Write(audioOpen2) sb.WriteString(media.URL) sb.Write(sidParam) sb.WriteString(strconv.Itoa(sectionID)) sb.Write(stypeParam) sb.WriteString(sectionType) sb.Write(audioClose) i += urlLen lastItem = i continue case EImage: addImage(media.URL) continue case 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 case ERaw: sb.WriteString(media.Body) i += urlLen lastItem = i continue case ENone: // Do nothing // TODO: Add support for media plugins default: 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", "
", -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] if ch != '\\' && ch != '_' && ch != '?' && ch != '&' && ch != '=' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 60) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 57 is 9, 58 is :, 59 is ;, 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] if ch != '\\' && ch != '_' && ch != '?' && ch != '&' && ch != '=' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 60) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 57 is 9, 58 is :, 59 is ;, 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] if ch != '\\' && ch != '_' && ch != '?' && ch != '&' && ch != '=' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 60) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 57 is 9, 58 is :, 59 is ;, 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 > 44 && ch < 60) && !(ch > 64 && ch < 92) && !(ch > 96 && ch < 123) { // 57 is 9, 58 is :, 59 is ;, 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] if ch != '\\' && ch != '_' && ch != '?' && ch != '&' && ch != '=' && ch != '@' && ch != '#' && ch != ']' && !(ch > 44 && ch < 60) && !(ch > 64 && ch < 91) && !(ch > 96 && ch < 123) { // 57 is 9, 58 is :, 59 is ;, 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 Type int URL string FURL string Body string Trusted bool // samesite urls } const ( ENone = iota ERaw EImage AImage AVideo AAudio AOther ) var LastEmbedID = AOther // TODO: Write a test for this func parseMediaString(data string, settings *ParseSettings) (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 ext := strings.TrimPrefix(filepath.Ext(path), ".") if len(ext) == 0 { // TODO: Write a unit test for this return media, false } switch { case ImageFileExts.Contains(ext): media.Type = AImage case WebVideoFileExts.Contains(ext): media.Type = AVideo case WebAudioFileExts.Contains(ext): media.Type = AAudio default: media.Type = AOther } return media, true } } if !settings.NoEmbed { // ? - 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 = ERaw // TODO: Filter the URL to make sure no nasties end up in there media.Body = "" return media, true } } if lastFrag := pathFrags[len(pathFrags)-1]; lastFrag != "" { // TODO: Write a function for getting the file extension of a string ext := strings.TrimPrefix(filepath.Ext(lastFrag), ".") if len(ext) != 0 { if ImageFileExts.Contains(ext) { media.Type = EImage var sport string if port != "443" && port != "80" && port != "" { sport = ":" + port } media.URL = scheme + "//" + host + sport + path return media, true } // TODO: Support external videos } } } 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.FURL = host + sport + path + q + frag media.URL = scheme + "//" + media.FURL return media, true } // TODO: Write a test for this func CoerceIntString(data string) (res, 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, lastPage, 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, page, 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, perPage int) int { return (count / perPage) + 1 }