storage-upload/README.md

# storage-upload

Micro service for uploading and image resizing files to a storage server.

# Usage

storage-upload listens on port 4020 by default. Since the storage upload needs a place to store the uploaded files, it's important to map the `/app/public` folder to either locally or some volume.

In addition it's recommended to also map the config file `/app/config/config.production.json` which should include a list of accepted sites and the corresponding json web token secret.

```bash
docker run -d \
  --name storage-upload \
  -v /path/to/store/files:/app/public \
  -v /path/to/config/file.json:/app/config/config.production.json \
  -p 4000:4020
  nfpis/storage-upload
```

### Config

The mapped config file should look something like this:

`config.production.json`
```json
{
  "sites": {
    "site1": {
      "keys": {
        "default@HS256": "asdf1234"
      }
    },
    "site2": {
      "public": true,
      "keys": {
        "default@HS256": "asdf1234",
        "default@HS512": "asdfasdf"
      }
    }
  }
}
```

Each entry in `sites` has the following properties:

* **keys:** Array list of key + hashing algorithm with the corresponding secret key for it.

* **public:** Boolean property to indicate this folder allows public folder enumerating.

The server checks the token in the query for supported site name and then verifies the secret match. To generate a token valid to upload to `site2` above, you can run something like this:

```node
const jwt = require('jsonwebtoken')

let token = jwt.sign({ iss: 'site2' }, 'site2-secret')
// eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoic2l0ZTIifQ.Ovz7fnTMzaWOLOhnbkMtqHPk20EVqhCD8WDsLKk_Wv0
```

*Hint: Post the above token to https://jwt.io/ and check it out.*

Using the above token would save the requested file under `/app/public/site2/` folder

# API

* POST `/media`
* POST `/media/noprefix`
* POST `/media/resize`
* GET `/media`
* GET `/media/:site`
* DELETE `/media/:filename`

## POST /media

Upload requested file to the corresponding folder with auto-generated datetime prefix.
  
*  **URL Params**
 
   `token=[site-token-here]`

* **Data Params**
   
   `file=@my-file-to-upload.jpg`

* **Success Response:**

  * **Code:** 200 <br />
    **Content:** `{ filename: '20171210_115632_my-file-to-upload.jpg', path: '/development/20171210_115632_my-file-to-upload.jpg' }`

* **Sample Call:**

  ```bash
  curl -X POST -F "file=@my-file-to-upload.jpg" http://localhost:4020/media\?token\=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoidGVzdCJ9.2LAuYwb1bwiMPUWD3gNJKwt9PwLgctleLhYd6sc0FCU
  ```
  

## POST /media/noprefix

Upload requested file to the corresponding folder with no prefix, overwriting any existing file if such conflicts happen.
  
*  **URL Params**
 
   `token=[site-token-here]`

* **Data Params**
   
   `file=@my-file-to-upload.jpg`

* **Success Response:**

  * **Code:** 200 <br />
    **Content:** `{ filename: 'my-file-to-upload.jpg', path: '/development/my-file-to-upload.jpg' }`

* **Sample Call:**

  ```bash
  curl -X POST -F "file=@my-file-to-upload.jpg" http://localhost:4020/media/noprefix\?token\=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoidGVzdCJ9.2LAuYwb1bwiMPUWD3gNJKwt9PwLgctleLhYd6sc0FCU
  ```
  
  
## POST /media/resize

Upload requested file to the corresponding folder and create multiple different resolutions or versions using the requested parameters.
  
*  **URL Params**
 
   `token=[site-token-here]`

* **Data Params**
   
   `file=@my-file-to-upload.jpg`
   
* **Body Params**
   
```json
{
  "medium": {
    "format": "png",
    "png": {
      "compressionLevel": 9
    },
    "resize": {
      "width": 600,
      "fit": "inside",
      "withoutEnlargement": true
    },
  },
  "small": {
    "format": "jpeg",
    "jpeg": {
      "quality": 80,
      "mozjpeg": true
    },
    "resize": {
      "width": 300,
    },
  },
  "tiny": {
    "format": "jpeg",
    "jpeg": {
      "quality": 80,
      "mozjpeg": true
    },
    "blur": 1,
    "resize": {
      "width": 100,
    },
  },
}
```

* **Supported operations:** `trim`, `flatten`, `resize`, `blur`, `extend`

For more information about the operations and the parameters they accept, see sharp documentation: https://sharp.pixelplumbing.com/

* **Success Response:**

  * **Code:** 200 <br />
    **Content:**
    
```json
{
  "filename": "20220106_102348_test.png",
  "path": "/development/20220106_102348_test.png",
  "medium": {
    "filename": "20220106_102348_test_medium.png",
    "path": "/development/20220106_102348_test_medium.png"
  },
  "small": {
    "filename": "20220106_102348_test_small.jpg",
    "path": "/development/20220106_102348_test_small.jpg"
  },
  "tiny": {
    "filename": "20220106_102348_test_small.jpg",
    "path": "/development/20220106_102348_test_small.jpg"
  }
}
```

* **Sample Call:**

  ```bash
  curl -X POST -F 'medium={\"format\":\"png\",\"png\":{\"compressionLevel\":9},\"resize\":{\"width\":300}}' -F "file=@test.png" 'http://localhost:4020/media/resize?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoidGVzdCJ9.2LAuYwb1bwiMPUWD3gNJKwt9PwLgctleLhYd6sc0FCU'
  ```


## GET /media

List all files in the reqested folder
  
*  **URL Params**
 
   `token=[site-token-here]`

* **Success Response:**

  * **Code:** 200 <br />
    **Content:** `[{filename: 'file1.jpg', size:111}, {filename: 'file2.png', size: 222}]`

* **Sample Call:**

  ```bash
  curl -X GET http://localhost:4020/media\?token\=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoidGVzdCJ9.2LAuYwb1bwiMPUWD3gNJKwt9PwLgctleLhYd6sc0FCU
  ```
  

## GET /media/:sitename

List all files in the reqested sitename folder. Please note that this requires the requested site in the config to have `"public":true` specified. Otherwise it will always return `404`.
 
* **Success Response:**

  * **Code:** 200 <br />
    **Content:** `[{filename: 'file1.jpg', size:111}, {filename: 'file2.png', size: 222}]`

* **Sample Call:**

  ```bash
  curl -X GET http://localhost:4020/media/mypublicsite
  ```
  

## DELETE /media/:filename

Remove the filename from the site from the token. Returns `204` if file is found and removed, otherwise returns `422`.
  
*  **URL Params**
 
   `token=[site-token-here]`

* **Success Response:**

  * **Code:** 204

* **Sample Call:**

  ```bash
  curl -X DEL http://localhost:4020/media/20220105_101610_test1.jpg\?token\=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzaXRlIjoidGVzdCJ9.2LAuYwb1bwiMPUWD3gNJKwt9PwLgctleLhYd6sc0FCU
  ```

# Errors

Errors return in the following format: `{ status:422, message: "error message here" }`

# Example node.js helper

`upload.js`
```node
import http from 'http'
import fs from 'fs/promises'
import path from 'path'
import { URL } from 'url'

// taken from isobject npm library
function isObject(val) {
  return val != null && typeof val === 'object' && Array.isArray(val) === false
}

function defaults(options, def) {
  let out = { }

  if (options) {
    Object.keys(options || {}).forEach(key => {
      out[key] = options[key]

      if (Array.isArray(out[key])) {
        out[key] = out[key].map(item => {
          if (isObject(item)) return defaults(item)
          return item
        })
      } else if (out[key] && typeof out[key] === 'object') {
        out[key] = defaults(options[key], def && def[key])
      }
    })
  }

  if (def) {
    Object.keys(def).forEach(function(key) {
      if (typeof out[key] === 'undefined') {
        out[key] = def[key]
      }
    })
  }

  return out
}

function Client(prefix = 'http://localhost:4020', opts) {
  this.options = defaults(opts, {})
  this.prefix = prefix
}

Client.prototype.customRequest = function(method = 'GET', path, body, options) {
  if (path.slice(0, 4) !== 'http') {
    path = this.prefix + path
  }
  let urlObj = new URL(path)

  return new Promise((resolve, reject) => {
    const opts = defaults(defaults(options, {
      method: method,
      timeout: 500,
      protocol: urlObj.protocol,
      username: urlObj.username,
      password: urlObj.password,
      host: urlObj.hostname,
      port: Number(urlObj.port),
      path: urlObj.pathname + urlObj.search,
    }))

    const req = http.request(opts)
    if (body) {
      req.write(body)
    }

    req.on('error', reject)
    req.on('timeout', function() { reject(new Error(`Request ${method} ${path} timed out`)) })
    req.on('response', res => {
      res.setEncoding('utf8')
      let output = ''

      res.on('data', function (chunk) {
        output += chunk.toString()
      })

      res.on('end', function () {
        if (!output) return resolve(null)
        try {
          output = JSON.parse(output)
        } catch (e) {
          return reject(new Error(`${e.message} while decoding: ${output}`))
        }
        if (output.status) {
          let err = new Error(`Request failed [${output.status}]: ${output.message}`)
          err.body = output
          err.status = output.status
          return reject(err)
        }
        resolve(output)
      })
    })
    req.end()
  })
}

Client.prototype.get = function(url = '/') {
  return this.customRequest('GET', url, null)
}

Client.prototype.del = function(url = '/', body = {}) {
  return this.customRequest('DELETE', url, JSON.stringify(body))
}

const random = (length = 8) => {
  // Declare all characters
  let chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  // Pick characers randomly
  let str = '';
  for (let i = 0; i < length; i++) {
      str += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return str;
}

Client.prototype.upload = function(url, file, method = 'POST', body = {}) {
  return fs.readFile(file).then(data => {
    const crlf = '\r\n'
      const filename = path.basename(file)
      const boundary = `---------${random(32)}`

      const multipartBody = Buffer.concat([
        Buffer.from(
          `${crlf}--${boundary}${crlf}` +
          `Content-Disposition: form-data; name="file"; filename="${filename}"` + crlf + crlf
        ),
        data,
        Buffer.concat(Object.keys(body).map(function(key) {
          return Buffer.from(''
            + `${crlf}--${boundary}${crlf}`
            + `Content-Disposition: form-data; name="${key}"` + crlf + crlf
            + JSON.stringify(body[key])
          )
        })),
        Buffer.from(`${crlf}--${boundary}--`),
      ])

      return this.customRequest(method, url, multipartBody, {
        timeout: 5000,
        headers: {
          'Content-Type': 'multipart/form-data; boundary=' + boundary,
          'Content-Length': multipartBody.length,
        },
      })
  })
}

// const client = new Client()
// client.upload('/media/resize', 'test.png', {
//   medium: {
//     format: 'jpeg',
//     resize: { width: 200 },
//   },
// }).then(function(res) {
//   console.log('success', res)
// }, function(err) {
//   console.log('error', err)
// })
```