Build Folder Tree

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Dynamic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using Box.V2;
using Box.V2.Auth;
using Box.V2.Config;
using Box.V2.Converter;
using Box.V2.Exceptions;
using Box.V2.JWTAuth;
using Box.V2.Models;
using Newtonsoft.Json;

namespace BoxPlayground
{
    public class Program4
    {
        static void Main(string[] args)
        {
            ExecuteMainAsync().Wait();
        }

        public class BoxFolderTreeBuilder
        {
            public BoxClient BoxClient { get; set; }
            public string RootFolderId { get; set; }
            public int MaxDepth { get; set; }

            public BoxFolderTreeBuilder(BoxClient boxClient, string rootFolderId = "0", int maxDepth = -1)
            {
                this.BoxClient = boxClient;
                this.RootFolderId = rootFolderId;
                this.MaxDepth = maxDepth;
            }

            public async Task<BoxFolderTree> BuildFolderTreeWithFlatLists()
            {
                var tree = new BoxFolderTree
                {
                    RootId = this.RootFolderId,
                    Files = new List<BoxFolderTreeItem>(),
                    Folders = new List<BoxFolderTreeFolder>()
                };
                var rootFolderItems = await this.BoxClient.FoldersManager.GetFolderItemsAsync(this.RootFolderId, limit: 1000, autoPaginate: true);
                var rootFolderChildren = new List<BoxFolderTreeFolder>();
                foreach (var item in rootFolderItems.Entries)
                {
                    var folderTreeItem = new BoxFolderTreeItem(item);
                    folderTreeItem.Path = $"{this.RootFolderId}";
                    if (item.Type == "file")
                    {
                        tree.Files.Add(folderTreeItem);
                    }
                    else if (item.Type == "folder")
                    {
                        var childFolder = new BoxFolderTreeFolder(folderTreeItem);
                        tree.Folders.Add(new BoxFolderTreeFolder(folderTreeItem));
                        rootFolderChildren.Add(childFolder);
                    }
                }
                tree = await Dive(tree, rootFolderChildren, 1);
                return tree;
            }

            private async Task<BoxFolderTree> Dive(BoxFolderTree tree,
                List<BoxFolderTreeFolder> children, int currentDepth)
            {
                if (InTooDeep(currentDepth))
                {
                    return tree;
                }
                else
                {
                    currentDepth++;
                    var additionalChildren = new List<BoxFolderTreeFolder>();
                    foreach (var child in children)
                    {
                        var folderItems = await this.BoxClient.FoldersManager.GetFolderItemsAsync(child.Item.Id, limit: 1000, autoPaginate: true);
                        var foundFolder = tree.Folders.FindIndex((f) =>
                        {
                            return f.Item.Id == child.Item.Id;
                        });
                        foreach (var item in folderItems.Entries)
                        {
                            if (foundFolder >= 0)
                            {
                                tree.Folders[foundFolder].Children.Add(item);
                            }
                            var folderTreeItem = new BoxFolderTreeItem(item);
                            folderTreeItem.Path = $"{child.Path}/{child.Item.Id}";
                            if (item.Type == "file")
                            {
                                tree.Files.Add(folderTreeItem);
                            }
                            else if (item.Type == "folder")
                            {
                                var childFolder = new BoxFolderTreeFolder(folderTreeItem);
                                tree.Folders.Add(new BoxFolderTreeFolder(folderTreeItem));
                                additionalChildren.Add(childFolder);
                            }
                        }
                    }
                    if (additionalChildren.Count == 0)
                    {
                        return tree;
                    }
                    else
                    {
                        return await Dive(tree, additionalChildren, currentDepth);
                    }
                }
            }

            private bool InTooDeep(int depthCount)
            {
                if (this.MaxDepth < 0)
                {
                    return false;
                }
                else
                {
                    return (depthCount >= this.MaxDepth);
                }
            }
            public class BoxFolderTreeItem
            {
                [JsonProperty(PropertyName = "item")]
                public BoxItem Item { get; set; }

                [JsonProperty(PropertyName = "path")]
                public string Path { get; set; }
                public BoxFolderTreeItem(BoxItem item)
                {
                    Item = item;
                }
            }
            public class BoxFolderTreeFolder : BoxFolderTreeItem
            {
                public BoxFolderTreeFolder(BoxFolderTreeItem item) : base(item.Item)
                {
                    this.Path = item.Path;
                }

                [JsonProperty(PropertyName = "children")]
                public List<BoxItem> Children { get; set; } = new List<BoxItem>();
            }
            public class BoxFolderTree
            {
                [JsonProperty(PropertyName = "rootId")]
                public string RootId { get; set; }
                [JsonProperty(PropertyName = "files")]
                public List<BoxFolderTreeItem> Files { get; set; }

                [JsonProperty(PropertyName = "folders")]
                public List<BoxFolderTreeFolder> Folders { get; set; }

                public string writeJSON()
                {
                    var converter = new Box.V2.Converter.BoxJsonConverter();
                    return converter.Serialize<BoxFolderTreeBuilder.BoxFolderTree>(this);
                }
            }
        }
        private static async Task ExecuteMainAsync()
        {
            using (FileStream fs = new FileStream($"./config.json", FileMode.Open))
            {
                var session = new BoxJWTAuth(BoxConfig.CreateFromJsonFile(fs));
                var serviceAccountClient = session.AdminClient(session.AdminToken());
                var folderTreeBuilder = new BoxFolderTreeBuilder(serviceAccountClient, rootFolderId: "37477903736");
                var tree = await folderTreeBuilder.BuildFolderTreeWithFlatLists();
                System.Console.WriteLine(tree.writeJSON());
            }
        }
    }
}

package com.box;

import java.io.BufferedReader;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import com.box.sdk.BoxConfig;
import com.box.sdk.BoxDeveloperEditionAPIConnection;
import com.box.sdk.BoxFile;
import com.box.sdk.BoxFolder;
import com.box.sdk.BoxItem;
import com.eclipsesource.json.JsonArray;
import com.eclipsesource.json.JsonObject;

public class BoxFolderTreeBuilder {
    private BoxDeveloperEditionAPIConnection _boxClient;
    private String _rootFolderId;
    private int _maxDepth;

    private static final String DEFAULT_ROOT_FOLDER_ID = "0";
    private static final int DEFAULT_MAX_DEPTH = -1;

    public BoxFolderTreeBuilder(BoxDeveloperEditionAPIConnection boxClient) {
        this(boxClient, DEFAULT_ROOT_FOLDER_ID, DEFAULT_MAX_DEPTH);
    }

    public BoxFolderTreeBuilder(BoxDeveloperEditionAPIConnection boxClient, String rootFolderId) {
        this(boxClient, rootFolderId, DEFAULT_MAX_DEPTH);
    }

    public BoxFolderTreeBuilder(BoxDeveloperEditionAPIConnection boxClient, int maxDepth) {
        this(boxClient, DEFAULT_ROOT_FOLDER_ID, maxDepth);
    }

    public BoxFolderTreeBuilder(BoxDeveloperEditionAPIConnection boxClient, String rootFolderId, int maxDepth) {
        this._boxClient = boxClient;
        this._rootFolderId = rootFolderId;
        this._maxDepth = maxDepth;
    }

    public BoxFolderTree buildFolderTreeWithFlatLists() {
        BoxFolderTree tree = new BoxFolderTree();
        tree.setRootId(this._rootFolderId);
        ArrayList<BoxFolderTreeFolder> rootFolderChildren = new ArrayList<>();
        BoxFolder folder = new BoxFolder(this._boxClient, this._rootFolderId);
        String path = this._rootFolderId;
        for (BoxItem.Info itemInfo : folder) {
            if (itemInfo instanceof BoxFile.Info) {
                BoxFile.Info fileInfo = (BoxFile.Info) itemInfo;
                BoxFolderTreeFile treeFile = new BoxFolderTreeFile(fileInfo, path);
                tree.files.add(treeFile);
            } else if (itemInfo instanceof BoxFolder.Info) {
                BoxFolder.Info folderInfo = (BoxFolder.Info) itemInfo;
                BoxFolderTreeFolder treeFolder = new BoxFolderTreeFolder(folderInfo, path);
                tree.folders.add(treeFolder);
                rootFolderChildren.add(treeFolder);
            }
        }
        tree = Dive(tree, rootFolderChildren, 1);
        return tree;
    }

    private BoxFolderTree Dive(BoxFolderTree tree, ArrayList<BoxFolderTreeFolder> children, int currentDepth) {
        if (inTooDeep(currentDepth)) {
            return tree;
        } else {
            currentDepth++;
            ArrayList<BoxFolderTreeFolder> additionalChildren = new ArrayList<>();
            for (BoxFolderTreeFolder child : children) {
                BoxFolder folderItems = new BoxFolder(this._boxClient, child.getItem().getID());
                int foundFolder = -1;
                for (int i = 0; i < tree.folders.size(); i++) {
                    if (child.getItem().getID() == tree.folders.get(i).getItem().getID()) {
                        foundFolder = i;
                    }
                }
                String path = String.format("%s/%s", child.getPath(), child.getItem().getID());
                for (BoxItem.Info item : folderItems.getChildren()) {
                    if (foundFolder >= 0) {
                        tree.folders.get(foundFolder).children.add(new BoxFolderTreeItem(item));
                    }
                    if (item instanceof BoxFile.Info) {
                        BoxFile.Info fileInfo = (BoxFile.Info) item;
                        tree.files.add(new BoxFolderTreeFile(fileInfo, path));
                    } else if (item instanceof BoxFolder.Info) {
                        BoxFolder.Info folderInfo = (BoxFolder.Info) item;
                        BoxFolderTreeFolder nestedFolder = new BoxFolderTreeFolder(folderInfo, path);
                        tree.folders.add(nestedFolder);
                        additionalChildren.add(nestedFolder);
                    }
                }
            }
            if (additionalChildren.size() == 0) {
                return tree;
            } else {
                return Dive(tree, additionalChildren, currentDepth);
            }
        }
    }

    private Boolean inTooDeep(int depthCount) {
        if (this._maxDepth < 0) {
            return false;
        } else {
            return (depthCount >= this._maxDepth);
        }
    }

    public class BoxFolderTree {
        private String rootId;
        private ArrayList<BoxFolderTreeFile> files = new ArrayList<>();
        private ArrayList<BoxFolderTreeFolder> folders = new ArrayList<>();

        public String getRootId() {
            return this.rootId;
        }

        public void setRootId(String id) {
            this.rootId = id;
        }

        public String writeJSON() {
            JsonObject requestJSON = new JsonObject();

            JsonArray filesJSON = new JsonArray();
            for (BoxFolderTreeFile file : files) {
                filesJSON.add(file.convertToJSON());
            }

            JsonArray foldersJSON = new JsonArray();
            for (BoxFolderTreeFolder folder : folders) {
                foldersJSON.add(folder.convertToJSON());
            }
            requestJSON.add("rootId", this.rootId);
            requestJSON.add("files", filesJSON);
            requestJSON.add("folders", foldersJSON);
            return requestJSON.toString();
        }
    }

    public class BoxFolderTreeItem {
        private BoxItem.Info item;

        public BoxFolderTreeItem(BoxItem.Info item) {
            this.item = item;
        }

        public JsonObject convertToJSON() {
            JsonObject itemJSON = new JsonObject();
            itemJSON.add("id", this.item.getID());
            itemJSON.add("name", this.item.getName());
            String type = (item instanceof BoxFile.Info == true) ? "file" : "folder";
            itemJSON.add("type", type);
            return itemJSON;
        }
    }

    public class BoxFolderTreeFile {
        private BoxFile.Info item;
        private String path;

        public BoxFolderTreeFile(BoxFile.Info item, String path) {
            this.item = item;
            this.path = path;
        }

        public BoxFile.Info getItem() {
            return this.item;
        }

        public void setItem(BoxFile.Info info) {
            this.item = info;
        }

        public String getPath() {
            return this.path;
        }

        public void setPath(String path) {
            this.path = path;
        }

        public JsonObject convertToJSON() {
            JsonObject itemJSON = new JsonObject();
            JsonObject fileJSON = new JsonObject();
            fileJSON.add("id", this.item.getID());
            fileJSON.add("type", "file");
            fileJSON.add("name", this.item.getName());

            itemJSON.add("path", this.path);
            itemJSON.add("item", fileJSON);
            return itemJSON;
        }
    }

    public class BoxFolderTreeFolder {
        private BoxFolder.Info item;
        private String path;
        private ArrayList<BoxFolderTreeItem> children;

        public BoxFolderTreeFolder(BoxFolder.Info item, String path) {
            this.item = item;
            this.path = path;
            this.children = new ArrayList<>();
        }

        public BoxFolder.Info getItem() {
            return this.item;
        }

        public void setItem(BoxFolder.Info info) {
            this.item = info;
        }

        public String getPath() {
            return this.path;
        }

        public void setPath(String path) {
            this.path = path;
        }

        public JsonObject convertFolderToJSON() {
            JsonObject itemJSON = new JsonObject();
            JsonObject folderJSON = new JsonObject();
            folderJSON.add("id", this.item.getID());
            folderJSON.add("type", "folder");
            folderJSON.add("name", this.item.getName());

            itemJSON.add("path", this.path);
            itemJSON.add("item", folderJSON);
            return itemJSON;
        }

        public JsonObject convertToJSON() {
            JsonObject folderJSON = this.convertFolderToJSON();
            JsonArray children = new JsonArray();
            for (BoxFolderTreeItem item : this.children) {
                children.add(item.convertToJSON());
            }
            folderJSON.add("children", children);
            return folderJSON;
        }
    }

    public static void main(String[] args) throws Exception {
        Path configPath = Paths.get("config.json");
        try (BufferedReader reader = Files.newBufferedReader(configPath, Charset.forName("UTF-8"))) {
            BoxConfig boxConfig = BoxConfig.readFrom(reader);
            BoxDeveloperEditionAPIConnection serviceAccountClient = BoxDeveloperEditionAPIConnection
                    .getAppEnterpriseConnection(boxConfig);

            BoxFolderTreeBuilder treeBuilder = new BoxFolderTreeBuilder(serviceAccountClient, "43491738095", 2);
            BoxFolderTree tree = treeBuilder.buildFolderTreeWithFlatLists();
            System.out.println(tree.writeJSON());
        }
    }
}

class BoxFolderTreeBuilder {
    constructor(boxClient, options) {
        options = options || {};
        boxClient._useIterators = true;
        this.boxClient = boxClient;
        this.maxDepth = options.maxDepth || -1;
        this.rootFolderId = options.rootFolderId || "0";
    }

    async buildFolderTreeWithFlatLists() {
        let tree = {
            rootId: this.rootFolderId,
            folders: [],
            files: []
        }
        let folderItemsIterator = await this.boxClient.folders.getItems(this.rootFolderId);
        let collection = await BoxUtilities.autoPage(folderItemsIterator);
        let rootFolderChildren = [];

        const path = `${this.rootFolderId}`;
        collection.forEach((item) => {
            if (item.type === "file") {
                tree.files.push({
                    item,
                    path
                })
            } else if (item.type === "folder") {
                let folderTreeFolder = {
                    item,
                    path,
                    children: []
                }
                tree.folders.push(folderTreeFolder);
                rootFolderChildren.push(folderTreeFolder);
            }
        });
        tree = await this.dive(tree, rootFolderChildren, 1);
        return tree;
    }

    async dive(tree, children, currentDepth) {
        if (this.inTooDeep(currentDepth)) {
            return tree;
        } else {
            currentDepth++;
            let additionalChildren = [];
            let childrenPromises = [];
            children.forEach((child) => {
                let foundFolder = -1;
                childrenPromises.push(this.boxClient.folders.getItems(child.item.id)
                    .then((folderItemsIterator) => {
                        return BoxUtilities.autoPage(folderItemsIterator)
                            .then((collection) => {
                                for (let i = 0; i < tree.folders.length; i++) {
                                    if (child.item.id === tree.folders[i].item.id) {
                                        foundFolder = i;
                                    }
                                }

                                const path = `${child.path}/${child.item.id}`;
                                collection.forEach((item) => {
                                    if (foundFolder >= 0) {
                                        tree.folders[foundFolder].children.push(item);
                                    }

                                    if (item.type === "file") {
                                        tree.files.push({
                                            item,
                                            path
                                        })
                                    } else if (item.type === "folder") {
                                        let folderTreeFolder = {
                                            item,
                                            path,
                                            children: []
                                        }
                                        tree.folders.push(folderTreeFolder);
                                        additionalChildren.push(folderTreeFolder);
                                    }
                                });
                                return;
                            });
                    }));
            });
            await Promise.all(childrenPromises);
            if (additionalChildren.length === 0) {
                return tree;
            } else {
                return this.dive(tree, additionalChildren, currentDepth);
            }
        }
    }

    inTooDeep(depthCount) {
        if (this.maxDepth < 0) {
            return false;
        } else {
            return (depthCount >= this.maxDepth);
        }
    }
}

class BoxUtilities {
    static async autoPage(iterator, collection = []) {
        let moveToNextItem = async () => {
            let item = await iterator.next();
            if (item.value) {
                collection.push(item.value);
            }

            if (item.done !== true) {
                return moveToNextItem();
            } else {
                return collection;
            }
        }
        return moveToNextItem();
    }
}

let folderTreeBuilder = new BoxFolderTreeBuilder(client);
folderTreeBuilder.buildFolderTreeWithFlatLists()
    .then((tree) => {
        console.log(JSON.stringify(tree));
    })