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# Passing data to Photopea

Photopea can be configured using a parameter after a hash sign.

    https://www.photopea.com#STRING_VALUE

Such URL can be opened directly, or used as a `src` of an `iframe`. String value is encoded into the URL using classic encoding of query parameters (space as %20 etc.). It corresponds to encodeURIComponent() in Javascript or urlencode() in PHP. This string contains a JSON object.

### JSON configuration object

JSON object must have the following structure:

    {
    	"files" : [
    		"https://www.mysite.com/images/design.psd",
    		"https://www.mysite.com/images/button.png",
    		"data:image/png;base64,iVBORw0KGgoAAAAN..."
    	],
    	"resources" : [
    		"https://www.xyz.com/brushes/Nature.ABR",
    		"https://www.xyz.com/grads/Gradients.GRD",
    		"https://www.xyz.com/fonts/NewFont.otf"
    	],
    	"server" : {
    		"version" : 1,
    		"url"     : "https://www.myserver.com/saveImage.php",
    		"formats" : [ "psd:true", "png", "jpg:0.5" ]
    	},
    	"environment" : {...},
    	"apis"   : { "dezgo": "d4e5f6"  },
    	"script" : "app.activeDocument.rotateCanvas(90);"
    }

All parameters are optional. Data URIs can be used - file can be passed inside a request (test).

### Parameters

- `files` - array of files, that are loaded when Photopea starts
- `resources` - array of resources (gradients, brushes, fonts ...)
- `server` - parameters for saving documents back to a server
  - `version` - the version of the API
  - `url` - URL address of a server
  - `formats` - formats, in which a document should be sent to a server. The string format corresponds to saveToOE.
- `environment` - parameters of the environment, see Environment
- `apis` - some features are done by third parties. Enter your own API keys to use them.
  - `dezgo` - unlock the Magic Replace and "Remove BG" with Dezgo
- `script` - the script, that should be executed after loading each file (can be long)

## Saving to server

When `server` parameter is specified in a request to Photopea.com, every document opened in Photopea will have the `File - Save` option. After a user clicks it, document data are sent to your server in a HTTP request using POST method.

Photopea will send binary data (a sequence of bytes) to your server, which has two parts:

- 2000 Bytes - JSON data
- the rest - one or more image files

The JSON will have a following structure:

    {
    	"source" : "https://www.mysite.com/images/button.png",
    	"versions" : [
    		{"format":"psd", "start":      0, "size": 700000 },
    		{"format":"jpg", "start": 700000, "size": 100000 },
    		...
    	]
    }

- `source` - if the file was loaded from your server, the value is the URL of this document. Otherwise (opening a local file, creating an empty file), it contains `"local,X,NAME"`, where X is the integer ID of the document, and NAME is the name of the document
- `versions` different versions of your document
  - `format` - format of the file, exported from Photopea
  - `start, size` - file offset and the size (relative, from the end of JSON)

Here is a short PHP example, which accepts files from Photopea.

    $fi = fopen("php://input", "rb");  $p = JSON_decode(fread($fi, 2000));
    // getting file name from "source"
    $fname = substr ($p->source, strrpos($p->source,"/")+1);
    $fo = fopen("img/".$fname,"wb");  while($buf=fread($fi,50000)) fwrite($fo,$buf);
    fclose($fi);  fclose($fo);

### Your Response

After the server receives a file, it can send back a JSON response with optional String parameters:

- `message` - when specified, will be displayed to the user for a moment
- `script` - when specified, will be executed (e.g. you can call `app.echoToOE("saved");`)
- `newSource` - when specified, will be used as a new value of "source" for saving to a server in the future (can be useful, when a file was created within Photopea: "source" was "local,...")

## Cross-Origin Resource Sharing

For security reasons, webapps can access only files from the same domain. In order to let Photopea load your file, the response of your server must contain the following header:

    Access-Control-Allow-Origin: *

Find out more at CORS specification or at enable-cors.org.

## Prices

Usage of Photopea API is completely free. Keep in mind, that PP is in early stages of development and there may be critical bugs. We do not take any responsibility for documents edited or generated by Photopea.

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