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75 lines
1.9 KiB
75 lines
1.9 KiB
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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