add endpoints to get single blog article

Signed-off-by: Tobias Erbshäußer <tobias@tesoft.dev>

backend/blog.go

@@ -32,8 +32,8 @@ type ArticleProperties struct {
 
 type Article struct {
 	ArticleProperties
-	Content string
-	Files   []ArticleFile
+	Content string        `json:"content"`
+	Files   []ArticleFile `json:"-"`
 }
 
 type ArticleFile struct {
@@ -230,9 +230,53 @@ func (h *ApiHandler) ServeBlogPut(writer http.ResponseWriter, request *http.Requ
 }
 
 func (h *ApiHandler) ServeBlogGetSingle(writer http.ResponseWriter, request *http.Request) {
-	// TODO
+	idStr := request.PathValue("id")
+	id, err := strconv.ParseInt(idStr, 10, 64)
+	if err != nil {
+		WriteError(writer, http.StatusBadRequest, "invalid id", err)
+		return
+	}
+
+	article, err := h.db.GetBlogArticle(IsAuthorized(request), id)
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			WriteError(writer, http.StatusNotFound, "article not found", nil)
+		} else {
+			WriteError(writer, http.StatusInternalServerError, "failed to query database", err)
+		}
+		return
+	}
+
+	WriteResponse(writer, http.StatusOK, article)
 }
 
 func (h *ApiHandler) ServeBlogFileGetSingle(writer http.ResponseWriter, request *http.Request) {
-	// TODO
+	idStr := request.PathValue("articleId")
+	articleId, err := strconv.ParseInt(idStr, 10, 64)
+	if err != nil {
+		WriteError(writer, http.StatusBadRequest, "invalid article id", err)
+		return
+	}
+
+	idStr = request.PathValue("fileId")
+	fileId, err := strconv.ParseInt(idStr, 10, 64)
+	if err != nil {
+		WriteError(writer, http.StatusBadRequest, "invalid file id", err)
+		return
+	}
+
+	file, err := h.db.GetBlogArticleFile(IsAuthorized(request), articleId, fileId)
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			WriteError(writer, http.StatusNotFound, "article file not found", nil)
+		} else {
+			WriteError(writer, http.StatusInternalServerError, "failed to query database", err)
+		}
+		return
+	}
+
+	_, err = writer.Write(file.Data)
+	if err != nil {
+		log.Println(err)
+	}
 }