feat: add /api/tag (#82)

server/tag.go

@@ -0,0 +1,51 @@
+package server
+
+import (
+	"encoding/json"
+	"memos/api"
+	"net/http"
+	"regexp"
+
+	"github.com/labstack/echo/v4"
+)
+
+func (s *Server) registerTagRoutes(g *echo.Group) {
+	g.GET("/tag", func(c echo.Context) error {
+		userID := c.Get(getUserIDContextKey()).(int)
+		contentSearch := "#"
+		memoFind := api.MemoFind{
+			CreatorID:     &userID,
+			ContentSearch: &contentSearch,
+		}
+
+		memoList, err := s.Store.FindMemoList(&memoFind)
+		if err != nil {
+			return echo.NewHTTPError(http.StatusInternalServerError, "Failed to find memo list").SetInternal(err)
+		}
+
+		tagMapSet := make(map[string]bool)
+
+		r, err := regexp.Compile("#(.+?) ")
+		if err != nil {
+			return echo.NewHTTPError(http.StatusInternalServerError, "Failed to compile regexp").SetInternal(err)
+		}
+		for _, memo := range memoList {
+			for _, rawTag := range r.FindAllString(memo.Content, -1) {
+				tag := r.ReplaceAllString(rawTag, "$1")
+				tagMapSet[tag] = true
+			}
+		}
+
+		tagList := []string{}
+		for tag := range tagMapSet {
+			tagList = append(tagList, tag)
+		}
+
+		c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSONCharsetUTF8)
+		if err := json.NewEncoder(c.Response().Writer).Encode(tagList); err != nil {
+			return echo.NewHTTPError(http.StatusInternalServerError, "Failed to encode tags response").SetInternal(err)
+		}
+
+		return nil
+	})
+}