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+<?php
+
+namespace Psr\Http\Message;
+
+/**
+ * Value object representing a file uploaded through an HTTP request.
+ *
+ * Instances of this interface are considered immutable; all methods that
+ * might change state MUST be implemented such that they retain the internal
+ * state of the current instance and return an instance that contains the
+ * changed state.
+ */
+interface UploadedFileInterface
+{
+ /**
+ * Retrieve a stream representing the uploaded file.
+ *
+ * This method MUST return a StreamInterface instance, representing the
+ * uploaded file. The purpose of this method is to allow utilizing native PHP
+ * stream functionality to manipulate the file upload, such as
+ * stream_copy_to_stream() (though the result will need to be decorated in a
+ * native PHP stream wrapper to work with such functions).
+ *
+ * If the moveTo() method has been called previously, this method MUST raise
+ * an exception.
+ *
+ * @return StreamInterface Stream representation of the uploaded file.
+ * @throws \RuntimeException in cases when no stream is available or can be
+ * created.
+ */
+ public function getStream();
+
+ /**
+ * Move the uploaded file to a new location.
+ *
+ * Use this method as an alternative to move_uploaded_file(). This method is
+ * guaranteed to work in both SAPI and non-SAPI environments.
+ * Implementations must determine which environment they are in, and use the
+ * appropriate method (move_uploaded_file(), rename(), or a stream
+ * operation) to perform the operation.
+ *
+ * $targetPath may be an absolute path, or a relative path. If it is a
+ * relative path, resolution should be the same as used by PHP's rename()
+ * function.
+ *
+ * The original file or stream MUST be removed on completion.
+ *
+ * If this method is called more than once, any subsequent calls MUST raise
+ * an exception.
+ *
+ * When used in an SAPI environment where $_FILES is populated, when writing
+ * files via moveTo(), is_uploaded_file() and move_uploaded_file() SHOULD be
+ * used to ensure permissions and upload status are verified correctly.
+ *
+ * If you wish to move to a stream, use getStream(), as SAPI operations
+ * cannot guarantee writing to stream destinations.
+ *
+ * @see http://php.net/is_uploaded_file
+ * @see http://php.net/move_uploaded_file
+ * @param string $targetPath Path to which to move the uploaded file.
+ * @throws \InvalidArgumentException if the $targetPath specified is invalid.
+ * @throws \RuntimeException on any error during the move operation, or on
+ * the second or subsequent call to the method.
+ */
+ public function moveTo($targetPath);
+
+ /**
+ * Retrieve the file size.
+ *
+ * Implementations SHOULD return the value stored in the "size" key of
+ * the file in the $_FILES array if available, as PHP calculates this based
+ * on the actual size transmitted.
+ *
+ * @return int|null The file size in bytes or null if unknown.
+ */
+ public function getSize();
+
+ /**
+ * Retrieve the error associated with the uploaded file.
+ *
+ * The return value MUST be one of PHP's UPLOAD_ERR_XXX constants.
+ *
+ * If the file was uploaded successfully, this method MUST return
+ * UPLOAD_ERR_OK.
+ *
+ * Implementations SHOULD return the value stored in the "error" key of
+ * the file in the $_FILES array.
+ *
+ * @see http://php.net/manual/en/features.file-upload.errors.php
+ * @return int One of PHP's UPLOAD_ERR_XXX constants.
+ */
+ public function getError();
+
+ /**
+ * Retrieve the filename sent by the client.
+ *
+ * Do not trust the value returned by this method. A client could send
+ * a malicious filename with the intention to corrupt or hack your
+ * application.
+ *
+ * Implementations SHOULD return the value stored in the "name" key of
+ * the file in the $_FILES array.
+ *
+ * @return string|null The filename sent by the client or null if none
+ * was provided.
+ */
+ public function getClientFilename();
+
+ /**
+ * Retrieve the media type sent by the client.
+ *
+ * Do not trust the value returned by this method. A client could send
+ * a malicious media type with the intention to corrupt or hack your
+ * application.
+ *
+ * Implementations SHOULD return the value stored in the "type" key of
+ * the file in the $_FILES array.
+ *
+ * @return string|null The media type sent by the client or null if none
+ * was provided.
+ */
+ public function getClientMediaType();
+}