add user tags endpoint

Author: stereosteve

api/server.go

@@ -141,6 +141,7 @@ func NewApiServer(config Config) *ApiServer {
 		g.Get("/users/:userId/related", app.v1UsersRelated)
 		g.Get("/users/:userId/supporting", app.v1UsersSupporting)
 		g.Get("/users/:userId/supporters", app.v1UsersSupporters)
+		g.Get("/users/:userId/tags", app.v1UsersTags)
 		g.Get("/users/:userId/tracks", app.v1UserTracks)
 		g.Get("/users/:userId/feed", app.v1UsersFeed)
 		g.Get("/users/:userId/connected_wallets", app.v1UsersConnectedWallets)

api/server_test.go

@@ -98,6 +98,8 @@ func Test200(t *testing.T) {
 		"/v1/full/users/7eP5n/tracks",
 		"/v1/full/users/7eP5n/feed",
 
+		"/v1/users/7eP5n/tags",
+
 		"/v1/full/users/handle/rayjacobson",
 		"/v1/full/users/handle/rayjacobson/tracks",
 		"/v1/full/users/handle/rayjacobson/reposts",

api/v1_users_tags.go

@@ -0,0 +1,45 @@
+package api
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"github.com/jackc/pgx/v5"
+)
+
+/*
+/v1/users/7eP5n/tags?limit=5
+*/
+
+func (app *ApiServer) v1UsersTags(c *fiber.Ctx) error {
+	sql := `
+	SELECT tag
+	FROM (
+		SELECT TRIM(regexp_split_to_table(tags, ',')) AS tag
+		FROM tracks
+		WHERE owner_id = @userId
+			AND is_unlisted = false
+			AND is_delete = false
+			AND stem_of is null
+	) AS split_tags
+	WHERE tag != ''
+	GROUP BY tag
+	ORDER BY COUNT(*) DESC
+	LIMIT @limit;
+	`
+
+	rows, err := app.pool.Query(c.Context(), sql, pgx.NamedArgs{
+		"userId": c.Locals("userId"),
+		"limit":  c.Query("limit", "10"),
+	})
+	if err != nil {
+		return err
+	}
+
+	tags, err := pgx.CollectRows(rows, pgx.RowTo[string])
+	if err != nil {
+		return err
+	}
+
+	return c.JSON(fiber.Map{
+		"data": tags,
+	})
+}