Notifications endpoint

api/server.go

@@ -422,6 +422,9 @@ func NewApiServer(config config.Config) *ApiServer {
 		// Developer Apps
 		g.Get("/developer_apps/:address", app.v1DeveloperApps)
 
+		// g.Use("/users/:userId", )
+		g.Get("/notifications/:userId", app.requireUserIdMiddleware, app.v1Notifications)
+
 		// Rewards
 		g.Post("/rewards/claim", app.v1ClaimRewards)
 

api/server_test.go

@@ -150,6 +150,8 @@ func Test200UnAuthed(t *testing.T) {
 		"/v1/full/playlists?id=7eP5n",
 		"/v1/full/playlists/7eP5n/reposts",
 		"/v1/full/playlists/7eP5n/favorites",
+
+		"/v1/full/notifications/7eP5n?limit=50",
 		"/v1/full/playlists/trending",
 		// unclaimed ids
 		"/v1/users/unclaimed_id",

api/v1_notifications.go

@@ -0,0 +1,150 @@
+package api
+
+import (
+	"encoding/json"
+	"slices"
+
+	"bridgerton.audius.co/trashid"
+	"github.com/gofiber/fiber/v2"
+	"github.com/jackc/pgx/v5"
+)
+
+func (app *ApiServer) v1Notifications(c *fiber.Ctx) error {
+
+	sql := `
+-- name: GetNotifs :many
+WITH user_seen as (
+  SELECT
+    LAG(seen_at, 1, now()::timestamp) OVER ( ORDER BY seen_at desc ) AS seen_at,
+    seen_at as prev_seen_at
+  FROM
+    notification_seen
+  WHERE
+    user_id = @user_id
+  ORDER BY
+    seen_at desc
+),
+user_created_at as (
+  SELECT
+    created_at
+  FROM
+    users
+  WHERE
+    user_id =  @user_id
+  AND is_current
+)
+SELECT
+    n.type,
+    n.group_id as group_id,
+    json_agg(
+      json_build_object(
+        'type', type,
+        'specifier', specifier::int,
+        'timestamp', EXTRACT(EPOCH FROM timestamp),
+        'data', data
+      )
+      ORDER BY timestamp DESC
+    )::jsonb as actions,
+    CASE
+      WHEN user_seen.seen_at is not NULL THEN now()::timestamp != user_seen.seen_at
+      ELSE EXISTS(SELECT 1 from notification_seen ns where ns.user_id = @user_id)
+    END::boolean as is_seen,
+
+    CASE
+      WHEN user_seen.seen_at != now()::timestamp THEN EXTRACT(EPOCH FROM user_seen.seen_at)
+      ELSE null
+    END AS seen_at
+
+FROM
+    notification n
+LEFT JOIN user_seen on
+  user_seen.seen_at >= n.timestamp and user_seen.prev_seen_at < n.timestamp
+WHERE
+  ((ARRAY[@user_id] && n.user_ids) OR (n.type = 'announcement' AND n.timestamp > (SELECT created_at FROM user_created_at)))
+  AND n.type = ANY(@valid_types)
+GROUP BY
+  n.type, n.group_id, user_seen.seen_at, user_seen.prev_seen_at
+ORDER BY
+  user_seen.seen_at desc NULLS LAST,
+  max(n.timestamp) desc,
+  n.group_id desc
+limit @limit::int
+;
+`
+
+	// default types are always enabled
+	validTypes := []string{
+		"repost",
+		"save",
+		"follow",
+		"tip_send",
+		"tip_receive",
+		"milestone",
+		"supporter_rank_up",
+		"supporting_rank_up",
+		"challenge_reward",
+		"tier_change",
+		"create",
+		"remix",
+		"cosign",
+		"trending",
+		"supporter_dethroned",
+		"reaction",
+		"track_added_to_playlist",
+	}
+
+	// add optional valid_types
+	for _, t := range queryMulti(c, "valid_types") {
+		if !slices.Contains(validTypes, t) {
+			validTypes = append(validTypes, t)
+		}
+	}
+
+	userId := app.getUserId(c)
+	limit := c.QueryInt("limit", 20)
+
+	// python returns 20 items when limit=0
+	// and client relies on this for showing unread count
+	if limit == 0 {
+		limit = 20
+	}
+
+	type GetNotifsRow struct {
+		Type    string          `json:"type"`
+		GroupID string          `json:"group_id"`
+		Actions json.RawMessage `json:"actions"`
+		IsSeen  bool            `json:"is_seen"`
+		SeenAt  interface{}     `json:"seen_at"`
+	}
+
+	rows, err := app.pool.Query(c.Context(), sql, pgx.NamedArgs{
+		"user_id":     userId,
+		"limit":       limit,
+		"valid_types": validTypes,
+	})
+	if err != nil {
+		return err
+	}
+
+	notifs, err := pgx.CollectRows(rows, pgx.RowToStructByNameLax[GetNotifsRow])
+	if err != nil {
+		return err
+	}
+
+	unreadCount := 0
+	for idx, notif := range notifs {
+		notif.Actions = trashid.HashifyJson(notif.Actions)
+		notifs[idx] = notif
+		if !notif.IsSeen {
+			unreadCount++
+		}
+	}
+
+	return c.JSON(fiber.Map{
+		"data": fiber.Map{
+			"notifications": notifs,
+			"unread_count":  unreadCount,
+		},
+	})
+
+}

trashid/hashify_json.go

@@ -0,0 +1,43 @@
+package trashid
+
+import (
+	"bytes"
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+var re = regexp.MustCompile(`"(?P<key>\w+_id|id|specifier)"\s*:\s*(?P<val>\d+)`)
+var skipKeys = [][]byte{
+	[]byte(`special_id`),
+}
+
+func HashifyJson(jsonBytes []byte) []byte {
+	return re.ReplaceAllFunc(jsonBytes, func(match []byte) []byte {
+		submatches := re.FindSubmatchIndex(match)
+		if submatches == nil || len(submatches) < 6 {
+			return match
+		}
+
+		// Extract key and value from match using named groups
+		key := match[submatches[2]:submatches[3]]
+		for _, skipKey := range skipKeys {
+			if bytes.Equal(key, skipKey) {
+				return match
+			}
+		}
+
+		val := match[submatches[4]:submatches[5]]
+		num, err := strconv.Atoi(string(val))
+		if err != nil {
+			return match
+		}
+
+		// Replace with hex string
+		hashed, err := EncodeHashId(num)
+		if err != nil {
+			return match
+		}
+		return []byte(fmt.Sprintf(`"%s": "%s"`, key, hashed))
+	})
+}

trashid/hashify_json_test.go

@@ -0,0 +1,65 @@
+package trashid
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tidwall/gjson"
+)
+
+func TestHashifyJson(t *testing.T) {
+	j1 := []byte(`
+	{
+		"data": {
+			"id": 1,
+			"user_id": 2,
+			"special_id": 999,
+			"tracks": [
+				{
+					"id": 3,
+					"title": "fun",
+					"value": "id",
+					"other": "user_id",
+					"good_idea": 333,
+					"ida": 111
+				},
+				{
+					"id": 4,
+					"title": "fun",
+					"value": "id",
+					"other": "user_id",
+					"good_idea": 333,
+					"ida": 111
+				}
+			]
+		}
+	}
+	`)
+
+	var m map[string]any
+	err := json.Unmarshal(j1, &m)
+	assert.NoError(t, err)
+	// fmt.Println(m)
+
+	j2 := HashifyJson(j1)
+
+	expectations := map[string]string{
+		"data.id":                 "7eP5n",
+		"data.user_id":            "ML51L",
+		"data.special_id":         "999",
+		"data.tracks.0.id":        "lebQD",
+		"data.tracks.0.value":     "id",
+		"data.tracks.0.other":     "user_id",
+		"data.tracks.0.good_idea": "333",
+		"data.tracks.1.id":        "ELKzn",
+	}
+	for path, exp := range expectations {
+		assert.Equal(t, exp, gjson.GetBytes(j2, path).String())
+	}
+
+	err = json.Unmarshal(j2, &m)
+	assert.NoError(t, err)
+	// fmt.Println(m)
+
+}