PHP Propel

fake option for migration

docker-compose run --rm -w /var/src/Propel api ./../vendor/bin/propel migrate --fake

it doesn't actually run the migrations, but it marks them as having been completed. It will add versions in propel_migration table.

Public key and private key

Mainly there are two use cases.

1. encrypte message using public key. Then decrypt message using private key
2. digitally sign message using private key. Then verify signature using public key

Here is example for use case 2. Use SSH public key and private key to do authentication for github after you upload your public key onto github server

1. You initiate an SSH connection to the server
2. The server chooses a random challenge (a nonce or session identifier) and sends it to you
3. Your SSH client uses your private key to compute a digital signature over that challenge
4. You send the signature back to the server
5. The server uses your stored public key to verify the signature
6. If verification succeeds, only someone with the private key could have produced it
7. You’re granted access; if it fails, you’re rejected

Another example for use case 2 is bitcoin transaction

1. Ower uses private key to sign the transaction
2. The signature is verfied by others using public key (the btc address comes from public key)

AWS policy to restrict ips to AWS Gateway API

Here is a sample policy. Only ips in the list will allow to call that API

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Condition": {
                "IpAddress": {
                    "aws:SourceIp": [
                        "223.333.923.28/32",
                        "162.222.229.139/32"
                    ]
                }
            },
            "Action": [
                "execute-api:Invoke"
            ],
            "Resource": [
                "arn:aws:execute-api:us-west-1:112334444444:1wertttt/*/POST/v1/bill",
                "arn:aws:execute-api:us-west-1:112334444444:1wertttt/*/GET/vi/bill/*"
            ],
            "Effect": "Allow"
        }
    ]
}

docker container run breakdown

Here is a command to run php 8 in a host machine which only has php 7 installed

docker run --rm --volume `pwd`:/var/src/ -w /var/src php:8.0.26-cli-alpine3.16  php ./bin/swagger_gen.php ./rest/swagger/v1/

Breakdown

• --rm Automatically remove the container and its associated anonymous volumes when it exits

• --volume `pwd`:/var/src/ Bind mount a volume (docker run --volume host-path:container-path

• pwd present working directory of your host machine

• -w Working directory inside the container

Indirect modification of overloaded property has no effect

<?php
error_reporting(E_ALL);

class PropertyTest
{
    /**  Location for overloaded data.  */
    private $data = array();


    public function __set($name, $value)
    {
        $this->data[$name] = $value;
    }

    public function __get($name)
    {
        if (array_key_exists($name, $this->data)) {
            return $this->data[$name];
        } else {
            throw new Exception($name . " not found");
        }
    }
}

$obj = new PropertyTest();
$obj->goods = ["a", "b"];

//the line below will throw notice
//Indirect modification of overloaded property PropertyTest::$goods has no effect
$obj->goods[] = "c";

//still got ["a", "b"]
var_dump($obj->goods);

To fix the error, replace the last two lines of codes with the below.

$obj->goods= array_merge($obj->goods, ['c']);

//got ["a", "b", "c"]
var_dump($obj->goods);

Here is another example

$obj = new PropertyTest();
$obj->test=["a"=>2];
var_dump($obj->test);
//will throw the notice and will not change value
$obj->test['a'] =3;
//the result is the same as what we get from the last dump
var_dump($obj->test);

To make it work as expected

$obj = new PropertyTest();
$obj->test=["a"=>2];
var_dump($obj->test);

$ans = $obj->test;
$ans['a'] = 3;
$obj->test = $ans;
var_dump($obj->test)