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https://github.com/toggle-corp/enketo-transformer


https://github.com/toggle-corp/enketo-transformer

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Enketo Transformer
=================

[![npm version](https://badge.fury.io/js/enketo-transformer.svg)](http://badge.fury.io/js/enketo-transformer) [![Build Status](https://travis-ci.org/enketo/enketo-transformer.svg?branch=master)](https://travis-ci.org/enketo/enketo-transformer) [![Dependency Status](https://david-dm.org/enketo/enketo-transformer.svg)](https://david-dm.org/enketo/enketo-transformer)

NodeJS library that transforms OpenRosa/ODK XForms into a format the Enketo understands. It works both as a library module, as well as a standalone app.

### Prerequisites

1. nodeJS 6+ and npm (only tested on Ubuntu 14.04, on older distros the GCC compiler may not be recent enough)

### Install as module

```bash
npm install enketo-transformer --save
```

### Use as module

```js
const transformer = require('enketo-transformer');
const xform = fs.readFileSync( 'path/to/xform.xml' );

transformer.transform( {
// required string of XForm
xform: xform,
// optional string, to add theme if no theme is defined in the XForm
theme: 'sometheme',
// optional map, to replace jr://..../myfile.png URLs
media: {
'myfile.png' : '/path/to/somefile.png',
'myfile.mp3' : '/another/path/to/2.mp3'
},
// optional ability to disable markdown rendering (default is true)
markdown: false,
// optional preprocess function that transforms the XForm (as libXMLJs object) to
// e.g. correct incompatible XForm syntax before Enketo's transformation takes place
preprocess: doc => doc,
} ).then(function( result ){
// do something with result
});
```

### Install as app (web API)
1. clone repo
2. install dependencies with `npm install`

### Use as app (web API)

1. start with `npm start`
2. limited use with `GET /transform` with xform parameter (required, **xform URL**), or
3. full-featured use with: `POST /transform` with URL-encoded body including `xform` (required, **full XForm as a string**), `theme` (optional, string), and `media` (optional, map) parameters

sample GET request:
```
curl http://localhost:8085/transform?xform=https://example.com/forms/78372/form.xml
```

sample POST request:
```bash
curl -d "xform=x&theme=plain&media[myfile.png]=/path/to/somefile.png&media[this]=that" http://localhost:8085/transform
```

### Response format

```json
{
"form" : ".....",
"model": "...",
"transformerVersion": "1.13.0",
"languageMap": { "Français": "fr", "English": "en" }
}

```

### Test

* run tests with `npm test`

### Develop

The script `npm run develop` runs the app on port 8085 and also serves test/forms on port 8081. You could test the transformation output by placing an XForm in test/forms and running
http://localhost:8085/transform?xform=http://localhost:8081/autocomplete.xml

A vagrant configuration file and provisioning script is also included. Use DEBUG environment variable to see debug terminal output, e.g.:

```bash
DEBUG=api,transformer,markdown,language node app.js
```

### License

See [license document](./LICENSE). Also note the additional 'powered by enketo' [footer requirement of enketo-xslt](https://github.com/enketo/enketo-xslt#license) which is used in this repository and therefore applicable.

### Change Log

See [change log](./CHANGELOG.md)