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versions.go
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versions.go
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package main
import (
"fmt"
"html/template"
"net/http"
"regexp"
)
func newVersionHandler(s storage, tmpl *template.Template) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
versionHandler(w, r, s, tmpl)
})
}
type versionListView struct {
Title string
VersionIDs []string
}
type versionView struct {
Title string
VersionID string
Content template.HTML
}
func versionHandler(w http.ResponseWriter, r *http.Request, s storage, tmpl *template.Template) {
title, err := versionTitle(r)
if err != nil {
renderError(w, tmpl, err)
return
}
versionID := r.URL.Query().Get("version_id")
if versionID == "" {
versions, err := s.ListArticleVersions(title)
if err != nil {
renderError(w, tmpl, fmt.Errorf("could not list article versions: %w", err))
return
}
render(
w,
tmpl,
"list_article_versions.tmpl",
versionListView{
Title: title,
VersionIDs: versions,
},
)
return
}
content, err := s.ReadArticleVersion(title, versionID)
if err != nil {
renderError(w, tmpl, fmt.Errorf("could not get content of article version: %w", err))
return
}
if r.URL.Query().Get("raw") == "true" {
w.Write([]byte(content))
return
}
contentHTML, err := md2html(content)
if err != nil {
renderError(w, tmpl, err)
}
a := versionView{
Title: title,
VersionID: versionID,
Content: contentHTML,
}
render(w, tmpl, "show_article_version.tmpl", a)
}
var versionPathMatcher = regexp.MustCompile(`^/versions/([0-9a-zA-Z_]+)$`)
func versionTitle(r *http.Request) (string, error) {
matches := versionPathMatcher.FindStringSubmatch(r.URL.Path)
if matches == nil {
return "", fmt.Errorf("invalid version URL")
}
return matches[1], nil
}