Add activity feeds API (#23494)

Close #5666

Add APIs for getting activity feeds.

routers/api/v1/user/user.go

@@ -145,3 +145,60 @@ func GetUserHeatmapData(ctx *context.APIContext) {
 	}
 	ctx.JSON(http.StatusOK, heatmap)
 }
+
+func ListUserActivityFeeds(ctx *context.APIContext) {
+	// swagger:operation GET /users/{username}/activities/feeds user userListActivityFeeds
+	// ---
+	// summary: List a user's activity feeds
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: username
+	//   in: path
+	//   description: username of user
+	//   type: string
+	//   required: true
+	// - name: only-performed-by
+	//   in: query
+	//   description: if true, only show actions performed by the requested user
+	//   type: boolean
+	// - name: date
+	//   in: query
+	//   description: the date of the activities to be found
+	//   type: string
+	//   format: date
+	// - name: page
+	//   in: query
+	//   description: page number of results to return (1-based)
+	//   type: integer
+	// - name: limit
+	//   in: query
+	//   description: page size of results
+	//   type: integer
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/ActivityFeedsList"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
+	includePrivate := ctx.IsSigned && (ctx.Doer.IsAdmin || ctx.Doer.ID == ctx.ContextUser.ID)
+	listOptions := utils.GetListOptions(ctx)
+
+	opts := activities_model.GetFeedsOptions{
+		RequestedUser:   ctx.ContextUser,
+		Actor:           ctx.Doer,
+		IncludePrivate:  includePrivate,
+		OnlyPerformedBy: ctx.FormBool("only-performed-by"),
+		Date:            ctx.FormString("date"),
+		ListOptions:     listOptions,
+	}
+
+	feeds, count, err := activities_model.GetFeeds(ctx, opts)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "GetFeeds", err)
+		return
+	}
+	ctx.SetTotalCountHeader(count)
+
+	ctx.JSON(http.StatusOK, convert.ToActivities(ctx, feeds, ctx.Doer))
+}