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system/vendor/php-http/promise/src/FulfilledPromise.php

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+<?php
+
+namespace Http\Promise;
+
+/**
+ * A promise already fulfilled.
+ *
+ * @author Joel Wurtz <joel.wurtz@gmail.com>
+ */
+final class FulfilledPromise implements Promise
+{
+    /**
+     * @var mixed
+     */
+    private $result;
+
+    /**
+     * @param $result
+     */
+    public function __construct($result)
+    {
+        $this->result = $result;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        if (null === $onFulfilled) {
+            return $this;
+        }
+
+        try {
+            return new self($onFulfilled($this->result));
+        } catch (\Exception $e) {
+            return new RejectedPromise($e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getState()
+    {
+        return Promise::FULFILLED;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function wait($unwrap = true)
+    {
+        if ($unwrap) {
+            return $this->result;
+        }
+    }
+}

system/vendor/php-http/promise/src/Promise.php

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+<?php
+
+namespace Http\Promise;
+
+/**
+ * Promise represents a value that may not be available yet, but will be resolved at some point in future.
+ * It acts like a proxy to the actual value.
+ *
+ * This interface is an extension of the promises/a+ specification.
+ *
+ * @see https://promisesaplus.com/
+ *
+ * @author Joel Wurtz <joel.wurtz@gmail.com>
+ * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ */
+interface Promise
+{
+    /**
+     * Promise has not been fulfilled or rejected.
+     */
+    const PENDING = 'pending';
+
+    /**
+     * Promise has been fulfilled.
+     */
+    const FULFILLED = 'fulfilled';
+
+    /**
+     * Promise has been rejected.
+     */
+    const REJECTED = 'rejected';
+
+    /**
+     * Adds behavior for when the promise is resolved or rejected (response will be available, or error happens).
+     *
+     * If you do not care about one of the cases, you can set the corresponding callable to null
+     * The callback will be called when the value arrived and never more than once.
+     *
+     * @param callable|null $onFulfilled called when a response will be available
+     * @param callable|null $onRejected  called when an exception occurs
+     *
+     * @return Promise a new resolved promise with value of the executed callback (onFulfilled / onRejected)
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null);
+
+    /**
+     * Returns the state of the promise, one of PENDING, FULFILLED or REJECTED.
+     *
+     * @return string
+     */
+    public function getState();
+
+    /**
+     * Wait for the promise to be fulfilled or rejected.
+     *
+     * When this method returns, the request has been resolved and if callables have been
+     * specified, the appropriate one has terminated.
+     *
+     * When $unwrap is true (the default), the response is returned, or the exception thrown
+     * on failure. Otherwise, nothing is returned or thrown.
+     *
+     * @param bool $unwrap Whether to return resolved value / throw reason or not
+     *
+     * @return mixed Resolved value, null if $unwrap is set to false
+     *
+     * @throws \Exception the rejection reason if $unwrap is set to true and the request failed
+     */
+    public function wait($unwrap = true);
+}

system/vendor/php-http/promise/src/RejectedPromise.php

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+<?php
+
+namespace Http\Promise;
+
+/**
+ * A rejected promise.
+ *
+ * @author Joel Wurtz <joel.wurtz@gmail.com>
+ */
+final class RejectedPromise implements Promise
+{
+    /**
+     * @var \Exception
+     */
+    private $exception;
+
+    /**
+     * @param \Exception $exception
+     */
+    public function __construct(\Exception $exception)
+    {
+        $this->exception = $exception;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        if (null === $onRejected) {
+            return $this;
+        }
+
+        try {
+            return new FulfilledPromise($onRejected($this->exception));
+        } catch (\Exception $e) {
+            return new self($e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getState()
+    {
+        return Promise::REJECTED;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function wait($unwrap = true)
+    {
+        if ($unwrap) {
+            throw $this->exception;
+        }
+    }
+}