implement /raw/[0-9]+ endpoint

DB.go

@@ -99,6 +99,11 @@ func (this *WikiDB) GetArticleById(articleId int) (*Article, error) {
 	return this.parseArticle(row)
 }
 
+func (this *WikiDB) GetRevision(revId int) (*ArticleWithTitle, error) {
+	row := this.db.QueryRow(`SELECT articles.*, titles.title FROM articles JOIN titles ON articles.article=titles.id WHERE articles.id = ?`, revId)
+	return this.parseArticleWithTitle(row)
+}
+
 func (this *WikiDB) GetLatestVersion(title string) (*Article, error) {
 	row := this.db.QueryRow(`SELECT articles.* FROM articles WHERE article = (SELECT id FROM titles WHERE title = ?) ORDER BY modified DESC LIMIT 1`, title)
 	return this.parseArticle(row)

WikiServer.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 )
 
@@ -147,6 +148,28 @@ func (this *WikiServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			this.servePageResponse(w, r, pto)
 			return
 
+		} else if strings.HasPrefix(r.URL.Path, this.opts.ExpectBaseURL+"raw/") {
+			revId, err := strconv.Atoi(r.URL.Path[len(this.opts.ExpectBaseURL+"raw/"):])
+			if err != nil {
+				this.serveErrorMessage(w, err)
+				return
+			}
+
+			a, err := this.db.GetRevision(revId)
+			if err != nil {
+				if err == sql.ErrNoRows {
+					this.serveErrorMessage(w, errors.New("No such revision."))
+					return
+				}
+
+				this.serveErrorMessage(w, err)
+				return
+			}
+
+			w.Header().Set(`Content-Type`, `text/plain; charset=UTF-8`)
+			w.WriteHeader(200)
+			w.Write(a.Body)
+			return
 		}
 
 	}
@@ -179,6 +202,7 @@ func (this *WikiServer) serveRedirect(w http.ResponseWriter, location string) {
 }
 
 func (this *WikiServer) servePageResponse(w http.ResponseWriter, r *http.Request, pto *pageTemplateOptions) {
+	w.WriteHeader(200)
 	pto.SessionMessage = template.HTML(r.URL.Query().Get("error")) // FIXME reflected XSS (although Chrome automatically blocks it..)
 
 	err := this.pageTmp.Execute(w, pto)