iOS 開發筆記 - [BoringSSL] nw_protocol_boringssl_input_finished, boringssl_context_alert_callback_handler, boringssl_session_errorlog, boringssl_session_handshake_error_print 處理方式

看到以下訊息，完全摸不著頭緒：

[BoringSSL] nw_protocol_boringssl_input_finished(1543) [C294.1:2][0x11f2823d0] Peer disconnected during the middle of a handshake. Sending errSSLClosedNoNotify(-9816) alert
TIC TCP Conn Failed [294:0x2812a5a40]: 3:-9816 Err(-9816)
[BoringSSL] nw_protocol_boringssl_input_finished(1543) [C295.1:2][0x108589540] Peer disconnected during the middle of a handshake. Sending errSSLClosedNoNotify(-9816) alert
TIC TCP Conn Failed [295:0x2812d0540]: 3:-9816 Err(-9816)
[BoringSSL] boringssl_context_alert_callback_handler(3724) [C296.1:2][0x108450060] Alert level: fatal, description: inappropriate fallback
[BoringSSL] boringssl_session_errorlog(224) [C296.1:2][0x108450060] [boringssl_session_handshake_incomplete] SSL_ERROR_SSL(1): operation failed within the library
[BoringSSL] boringssl_session_handshake_error_print(205) [C296.1:2][0x108450060] 4838922792:error:1000043e:SSL routines:OPENSSL_internal:TLSV1_ALERT_INAPPROPRIATE_FALLBACK:/BuildRoot/Library/Caches/com.apple.xbs/Sources/boringssl/boringssl-109.230.1/ssl/tls_record.cc:586:SSL alert number 86
[BoringSSL] boringssl_context_get_error_code(3617) [C296.1:2][0x108450060] SSL_AD_INAPPROPRIATE_FALLBACK
TIC TCP Conn Failed [296:0x2812d0a80]: 3:-9860 Err(-9860)
NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9860)
Task <FAB06FFC-73C2-48D8-AAEA-750F2FCF1969>.<0> HTTP load failed (error code: -1200 [3:-9860])
NSURLConnection finished with error - code -1200

最後拜讀 StackOverflow - XCode 9 iOS 11 BoringSSL SSL_ERROR_ZERO_RETURN 可以定義 CFNETWORK_DIAGNOSTICS = 3 數值來 debug，並透過 Xcode's scheme 管理環境變數即可，收工！

iOS 開發筆記 - Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'

閒暇時，追了這個 bug 很久...

主因是 source code 又沒看到 NSPlaceholderArray 關鍵字，最後才發現這是只是單純的 NSArray 相關更動事件。

要找的關鍵處有幾個：

• [arrayObject addObject:object];
• [arrayObject addObjectsFromArray:arrayObject];
• [NSArray arrayWithObject:object];
• ...

結果漏了一個生成 NSArray 很好用的語法：

• @[]

出包之處就是 @[] 相關動作啦，例如 @[obj1, obj2, obj3]; 其中有個 object 是 nil 啦

[PHP] 使用 CodeIgniter 和 codeigniter-restserver 建立 RESTful API 以及測試方式 @ Ubuntu 14.04

環境資訊：

• Ubuntu 14.04 64 Bit (lsb_release -a)
• PHP 5.5.9 (php -v)
• CodeIgniter 2.2.0 (echo CI_VERSION)

接著，透過 github.com/chriskacerguis/codeigniter-restserver 擴充 CodeIgniter：

$ wget https://raw.githubusercontent.com/chriskacerguis/codeigniter-restserver/master/application/config/rest.php -O /path/ci_proj/application/config/rest.php

$ wget https://raw.githubusercontent.com/chriskacerguis/codeigniter-restserver/master/application/libraries/Format.php -O /path/ci_proj/application/libraries/Format.php

$ wget https://raw.githubusercontent.com/chriskacerguis/codeigniter-restserver/master/application/libraries/REST_Controller.php -O /path/ci_proj/application/libraries/REST_Controller.php

接著，請確認 application/config/rest.php 設定：

$config[rest_default_format] = 'json'; // 預設為 xml

之後，就可以撰寫簡單的 RESTful API 啦：

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
require(APPPATH.'/libraries/REST_Controller.php');

class Item extends REST_Controller {
        public function index_get() {
                $this->list_get();
        }
        public function index_post() {
                $this->add_post();
        }
        public function index_put() {
                $this->update_put();
        }
        public function index_delete() {
                $this->delete_delte();
        }

        public function list_get() {
                echo "list";
        }
        public function add_post() {
                echo "create";
        }
        public function update_put() {
                echo "put";
        }
        public function remove_delete() {
                echo "remove";
        }
}

測試方式：

取得清單(GET)

$ curl -X GET http://localhost/ci_proj/item/list
$ curl -X GET http://localhost/ci_proj/item/

新增資料(POST)

$ curl -X POST http://localhost/ci_proj/item/add
$ curl -X POST http://localhost/ci_proj/item/

更新資料(PUT)

$ curl -X PUT http://localhost/ci_proj/item/update
$ curl -X PUT http://localhost/ci_proj/item/

刪除資料(DELETE)

$ curl -X DELETE http://localhost/ci_proj/item/delete
$ curl -X DELETE http://localhost/ci_proj/item/

也可以用 wget --method GET/POST/PUT/DELETE 等進行測試。

至於 RESTful 常見的 HTTP STATUS CODE，可以參考 Using HTTP Methods for RESTful Services

例如:

取得清單成功回應 200 OK，失敗則為 404 NOT FOUND；新增資料成功 200 OK 或是 201 LOCATION 到新增項目的 URI，失敗為 404 NOT FOUND；更新資料成功為 200 OK，失敗為 404 NOT FOUND；刪除資料成功為 200 OK，失敗為 404 NOT FOUND。

接著，是設計每個 GET, POST, PUT, DELETE API 細節，可以分別使用 $this->get('param')、$this->post('param')、$this->put('param') 和 $this->delete('param') 取得對應資料，而回應時，需要的 HTTP Status Code 可以使用：

$this->response( array('status' => true), 200);
$this->response( array('status' => false, 'error' => 'error message'), 400);
$this->response( array('status' => false, 'error' => 'error message'), 404);

若要 debug 的話，大概可以用：

$this->response( array('status' => true, 'get' => $this->get(), 'post' => $this->post(), 'put' => $this->put(), 'delete' => $this->delete() ), 200);

搭配 curl -i -X GET|POST|PUT|DELETE -d 'key=value' 方式進行，除了可以看到 HTTP Response code 外，也能看到 get, post, put, delete 各種參數資訊：

$ curl -i -X DELETE -d "haha=hehe" CGI
HTTP/1.1 200 OK
Server: Apache/2.4.7 (Ubuntu)
X-Powered-By: PHP/5.5.9-1ubuntu4.5
Content-Length: 68
Content-Type: application/json; charset=utf-8

{"status":true,"get":[],"post":[],"put":[],"delete":{"haha":"hehe"}}