README

Uploading files via HTTP style per-partes

Contains libraries for uploading large files with JavaScript FileApi with things like real truth-telling progress bar or available upload resume.

This is the mixed package - contains sever-side implementation in PHP and client-side in JavaScript/TypeScript.

Demonstration

All relevant examples are in /examples directory. The API between backend and frontend is described in Laravel and Symphony versions by OpenAPI. Many things can be set via initial option array as will be described later.

Principles

The file upload is not something that is so simple as it seems from the user side. To successfully upload some file you must expect problems with the connection or processing. This package uses a few important things for achieve its purpose.

1. Small parts! The usual upload (especially HTTP) sent the whole file at once and you must manipulate the upload process via some side channel. That has some disadvantages. Mainly when the upload crashes. Another is unknown passed size or upload speed.
2. Client rules. The main load of decisions what will be done is on the client side. The server is only your servant. That is different from the other style uploads where the server has larger say what is possible to upload. Mainly the size. This library goes around that problem. The only necessary thing is to store the shared key from the server from the previous step.
3. Indirect. The upload is indirect. That means the upload is sent to final storage AFTER all parts are on the server. The final storage can be either local or remote accessible via other libraries/connections. This also affects the manipulation - you can safely pause or cancel the process and the destination won't be affected.
4. Safe transfer. HTTP wasn't born with binary transfer in mind. That affects many things during upload. Modern browsers are usually capable of processing files, but the situation server-side is worse. This package can encode each part of binary data to achieve a safe transfer. With your own extension it's also possible to encrypt data parts to enhance safety.
5. File-based. No need to set external DB. You already have the necessary storage.

PHP Installation

composer.phar require alex-kalanis/upload-per-partes

(Refer to Composer Documentation if you are not familiar with composer)

PHP Usage

1.) Use your autoloader (if not already done via Composer autoloader)

2.) Connect the "kalanis\UploadPerPartes\Upload" into your app. When it came necessary you can extend every library to comply your use-case; mainly your storage and processing. All necessary settings are passed via constructor and array of params.

3.) Copy and connect the frontend library "uploader.ts" into your app. You need something like Grunt to translate TypeScript into JavaScript. Or you can use "uploader.js" which is Javascript version of the code. You may also extend included classes to comply your use-case; mainly for styling or paths.

Configuration options

All configuration is set on initialization by array of params for Uploader class. All entries can be ignored, although I recommend to set at least "temp_location" and "target_location".

• calc_size - integer, sets the size of the block. Is up to you how much you allow to pass by each segment.

• temp_location - string, set the location of directory with temporary files. Usually /temp or somewhere in directory accessible by web scripts

• target_location - string, the directory where it will be stored AFTER the upload will be complete.

• lang - string|object, the translation of all used quotes, not just when something fails. They are usually passed to uploader area on frontend, so it's better to use something. The value must be either the instance of \kalanis\UploadPerPartes\Interfaces\IUppTranslations interface or class-string with class implementing that interface.

• target - string|object, where is the local target. This package can be set to be chained with more parts. So the client won't be speaking with the real storage. This directive sets that possibility. The value must be either the instance of \kalanis\UploadPerPartes\Interfaces\IOperations interface or class-string with class implementing that interface or path to some target directory/remote URL base.

• data_encoder - string|int|object, set the way to pack/unpack server-side stored information about upload. This dataset is passed before upload to sync info about uploaded content during processing and changing during upload itself as progressing. With this directive you can set the format of stored data. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\DrivingFile\DataEncoders\AEncoder class or class-string with class implementing that abstraction or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\DrivingFile\DataEncoders\Factory. Will be ignored when the target is set to somewhere remote.

• data_modifier - string|int|object, set the way to pack/unpack server-side stored information about upload. This directive is about making the data compact for storage without affecting the structure - it's possible to set different compact mode and data encoder on different instances depending on the needs. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\DrivingFile\DataModifiers\AModifier class or class-string with class implementing that abstraction or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\DrivingFile\DataModifiers\Factory.
  The example: data encoder make JSON and then data modifier put it into HEX string. Will be ignored when the target is set to somewhere remote.

• key_encoder - string|int|object, set the way to encode shared key from the server side. So you can choose what will be the key under which the upload will be known. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\DrivingFile\KeyEncoders\AEncoder class or class-string with class implementing that abstraction or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\DrivingFile\KeyEncoders\Factory.
  Will be ignored when the target is set to somewhere remote.

• key_modifier - string|int|object, set the way to pack shared key from the server side. So you can choose what will be the key under which the upload will be known. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\DrivingFile\KeyModifiers\AModifier class or class-string with class implementing that abstraction or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\DrivingFile\KeyModifiers\Factory.
  The example: key encoder uses full path and then key modifier put it into HEX string. Will be ignored when the target is set to somewhere remote.

  Value processed by key_encoder and key_modifier will be returned to the client and will be expected in next call to as key to pair known upload.

• driving_file - string|int|object, where to store file with data about processing. Usually it can be the same directory as defined in temp_location. But you can use different storage. The value must be either the instance of \kalanis\UploadPerPartes\Interfaces\IDrivingFile interface or class-string with class implementing that interface or name of storage or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\DrivingFile\Storage\Factory. This is also the key for uploading without storing processing file.

• temp_storage - string|object, where to temporarily store the real file. Usually it is the same directory as defined in temp_location. But you can use different storage. The value must be either the instance of \kalanis\UploadPerPartes\Interfaces\ITemporaryStorage interface or some class with known storage background or string with name of storage or path to local storage.

• temp_encoder - string|int|object, how to encode key under which is it stored in the temporary storage. Usually file name. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\TemporaryStorage\KeyEncoders\AEncoder class or class-string with class implementing that abstraction or name of encoder or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\TemporaryStorage\KeyEncoders\Factory.

• final_storage - string|int|object, where to finally store the real file. Usually it is the same directory as defined in target_location. But you can use different storage. The value must be either the instance of \kalanis\UploadPerPartes\Interfaces\IFinalStorage interface or some class with known storage background or string with name of storage or path to local storage.

• final_encoder - string|int|object, how to encode key under which is it stored in the final storage. Usually the original file name. The value must be either the child of \kalanis\UploadPerPartes\Target\Local\TemporaryStorage\FinalStorage\AEncoder class or class-string with class implementing that abstraction or name of encoder or known id of currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\TemporaryStorage\FinalStorage\Factory.

• checksum - string, the way in which is checked the content of upload. Usually used after crashed upload. The value must be either the class-string implementing \kalanis\UploadPerPartes\Interfaces\IChecksum interface or name of checksum method currently available instances as seen in \kalanis\UploadPerPartes\Target\Local\Checksums\Factory.

• decoder - string, which method will be used for passing binary data through the wilderness of the network. Must be known by both client and server. Will be passed on init to the client and he will pass it back with each segment. The default is base64.

• can_continue - bool, if you can re-initialize upload and continue from previously stopped run.

With a special setting you can do anonymous share where you have just the server with data storage and the all upload process is on your clients. And then the other side must prove what the heck is inside that files before their action.

Python Installation

into your "setup.py":

    install_requires=[
        'kw_upload',
    ]

Python Usage

1.) Connect the "kw_upload\upload" into your app. When it came necessary you can extends every library to comply your use-case; mainly your storage and processing.

3.) Copy and connect the frontend library "uploader.ts" into your app. You need something like Grunt to translate TypeScript into JavaScript. You can also extends included classes to comply your use-case; mainly for styling.