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76 lines
1.9 KiB
76 lines
1.9 KiB
8 years ago
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package main
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import (
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"errors"
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"fmt"
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"html/template"
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"io/ioutil"
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"net/http"
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"regexp"
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"strings"
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"github.com/golang-commonmark/markdown"
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"github.com/labstack/echo"
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)
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var (
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errorCodes = map[int]string{
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400: "Bad request",
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401: "Unauthorized",
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404: "Not found",
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412: "Precondition failed",
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503: "Service unavailable",
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}
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rexpNewLine = regexp.MustCompile("[\n\r]")
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rexpNonAlphaNum = regexp.MustCompile("[`~!@#$%^&*_|+=?;:'\",.<>{}\\/]")
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rexpNoScriptIframe = regexp.MustCompile("<.*?(iframe|script).*?>")
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rexpLink = regexp.MustCompile("(ht|f)tp://[^\\s]+")
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errorUnathorised = errors.New("id or password is wrong")
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errorBadRequest = errors.New("password is empty")
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)
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func errPage(code int, details ...string) *Note {
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text := errorCodes[code]
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body := text
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if len(details) > 0 {
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body += ": " + strings.Join(details, ";")
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}
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n := &Note{
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Title: text,
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Text: fmt.Sprintf("# %d %s", code, body),
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}
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n.prepare()
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return n
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}
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func (n *Note) prepare() {
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fstLine := rexpNewLine.Split(n.Text, -1)[0]
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maxLength := 25
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if len(fstLine) < 25 {
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maxLength = len(fstLine)
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}
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n.Text = rexpNoScriptIframe.ReplaceAllString(n.Text, "")
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n.Title = strings.TrimSpace(rexpNonAlphaNum.ReplaceAllString(fstLine[:maxLength], ""))
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n.Content = mdTmplHTML([]byte(n.Text))
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}
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var mdRenderer = markdown.New(markdown.HTML(true))
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func mdTmplHTML(content []byte) template.HTML {
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return template.HTML(mdRenderer.RenderToString(content))
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}
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func md2html(c echo.Context, name string) (*Note, int) {
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path := "assets/markdown/" + name + ".md"
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mdContent, err := ioutil.ReadFile(path)
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if err != nil {
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c.Logger().Errorf("couldn't open markdown page %q: %v", path, err)
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code := http.StatusServiceUnavailable
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return errPage(code), code
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}
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c.Logger().Debugf("rendering markdown page %q", name)
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return &Note{Title: name, Content: mdTmplHTML(mdContent)}, http.StatusOK
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}
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