mirror of
https://github.com/osmarks/mycorrhiza.git
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114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
package util
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import (
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"crypto/rand"
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"encoding/hex"
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"log"
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"net/http"
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"regexp"
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"strings"
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"unicode"
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"github.com/bouncepaw/mycorrhiza/cfg"
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)
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func PrepareRq(rq *http.Request) {
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rq.URL.Path = strings.TrimSuffix(rq.URL.Path, "/")
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}
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// LettersNumbersOnly keeps letters and numbers only in the given string.
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func LettersNumbersOnly(s string) string {
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var (
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ret strings.Builder
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usedUnderscore bool
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)
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for _, r := range s {
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if unicode.IsLetter(r) || unicode.IsNumber(r) {
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ret.WriteRune(r)
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usedUnderscore = false
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} else if !usedUnderscore {
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ret.WriteRune('_')
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usedUnderscore = true
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}
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}
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return strings.Trim(ret.String(), "_")
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}
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// ShorterPath is used by handlerList to display shorter path to the files. It simply strips WikiDir.
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func ShorterPath(path string) string {
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if strings.HasPrefix(path, cfg.WikiDir) {
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tmp := strings.TrimPrefix(path, cfg.WikiDir)
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if tmp == "" {
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return ""
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}
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return tmp[1:]
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}
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return path
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}
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// HTTP404Page writes a 404 error in the status, needed when no content is found on the page.
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func HTTP404Page(w http.ResponseWriter, page string) {
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w.Header().Set("Content-Type", "text/html;charset=utf-8")
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w.WriteHeader(http.StatusNotFound)
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w.Write([]byte(page))
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}
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// HTTP200Page wraps some frequently used things for successful 200 responses.
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func HTTP200Page(w http.ResponseWriter, page string) {
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w.Header().Set("Content-Type", "text/html;charset=utf-8")
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(page))
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}
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func RandomString(n int) (string, error) {
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bytes := make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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// Strip hypha name from all ancestor names, replace _ with spaces, title case
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func BeautifulName(uglyName string) string {
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if uglyName == "" {
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return uglyName
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}
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return strings.Title(strings.ReplaceAll(uglyName, "_", " "))
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}
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// CanonicalName makes sure the `name` is canonical. A name is canonical if it is lowercase and all spaces are replaced with underscores.
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func CanonicalName(name string) string {
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return strings.ToLower(
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strings.ReplaceAll(
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strings.TrimRight(
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strings.TrimLeft(name, "_"),
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"_",
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), " ", "_"))
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}
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// HyphaPattern is a pattern which all hyphae must match.
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var HyphaPattern = regexp.MustCompile(`[^?!:#@><*|"'&%{}]+`)
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var UsernamePattern = regexp.MustCompile(`[^?!:#@><*|"'&%{}/]+`)
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// IsCanonicalName checks if the `name` is canonical.
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func IsCanonicalName(name string) bool {
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return HyphaPattern.MatchString(name)
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}
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func IsPossibleUsername(username string) bool {
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return username != "anon" && UsernamePattern.MatchString(strings.TrimSpace(username))
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}
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// HyphaNameFromRq extracts hypha name from http request. You have to also pass the action which is embedded in the url or several actions. For url /hypha/hypha, the action would be "hypha".
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func HyphaNameFromRq(rq *http.Request, actions ...string) string {
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p := rq.URL.Path
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for _, action := range actions {
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if strings.HasPrefix(p, "/"+action+"/") {
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return CanonicalName(strings.TrimPrefix(p, "/"+action+"/"))
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}
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}
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log.Println("HyphaNameFromRq: this request is invalid, fallback to home hypha")
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return cfg.HomeHypha
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}
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