kitchen

kitchen

A module to bake files from recipe files.

Recipe

A recipe file is a JSON file containing recipe data fields. A recipe file may end with the extension '.recipe.json' but this is not required.

name (REQUIRED)

The simple name of the file created by the recipe. The name field must contain at least one valid character. The name field must not contain any path specifiers, relative or absolute. Names containing path specifiers should not be processed at all, for security reasons.

{
  "name": "1342.txt"
}

length (REQUIRED)

The length of the file to be baked. This should be a non-negative integer value.

{
  "length": 717597
}

hash (RECOMMENDED)

The hash values to verify that the file has been baked correctly from the recipe file.

{
  "hash": {
    "ripemd160": "5aac0a87d3d54edd08326a73a045edc56805b33c",
    "sha512": "9ca5152a673dae24958c697aa26fe770caaef2e814eb94bdc6062c7fedbc51006a0b19a3756b9f11a4d78090ae7605217b6cd7510588bdc12b4d83d1dcaf4deb",
    "whirlpool": "c4ce1ad82ea158c6ddca77fcb9c8fa853ea94efc70436408b791e4aaf35c315ab9fd67b1cf42211953b8b43fcdd33fcf417f57a01af0d0e4928cf1bb2e626881"
  }
}

The keys are the names of the algorithms provided by OpenSSL. The values are the hash values computed from the content of the file. This section is optional, but it is strongly recommended that it be provided with every recipe. It is also recommended that multiple hash values from different families of hash algorithm be provided.

version (REQUIRED)

A tag to indicate the recipe format version being used by this recipe. The current "official" version of the recipe format is 1.

{
  "version": 1
}

This field is metadata to assist kitchen. It helps to bake older recipes according to the same process used for older files. It also helps to identify newer recipes that an older version of kitchen might not be able to bake correctly.

This field is a positive integer, starting at 1, incremented as the format of recipe files are changed. The value 0 has a special meaning.

If your fork or implementation of kitchen uses recipe files that differ significantly from the standard recipe format, you should not increment the version number. Instead, specify a version of 0 and provide a vendor field that includes version information specific to your implementation.

{
  "version": 0,
  "vendor": {
    "1a31934e-62f9-4ab5-b140-06931ded2482": { ... }
  }
}

See the vendor section below.

vendor (OPTIONAL)

A field to contain vendor specific information about a recipe file.

Each vendor who forks or implements kitchen should generate a random (Version 4) UUID for themselves. This random UUID should be used in recipes to contain information specific to that vendor's implementation.

{
  "version": 1,
  "vendor": {
    "206834f6-4891-46af-8878-23660df7c1a2": {
      "os": "win64"
    }
  }
}

If a vendor's implementation of kitchen uses recipe files that differ significantly from the standard recipe format, specify a version of 0.

{
  "version": 0,
  "vendor": {
    "1a31934e-62f9-4ab5-b140-06931ded2482": { ... }
  }
}

When using a standard version number (>= 1), the vendor section is intended to be advisory. The data contained in the section should be regarded as additional information, annotations, or comments. This information may be useful to some users, but may be disregarded by others without significant loss of functionality.

When using a version number of 0, the vendor section is intended to be governing. It indicates that may not be possible to make any sense of the recipe file without use of the information contained in the vendor section. Users who disregard this section may incur a significant loss of functionality with respect to this recipe file.

Note that the vendor section can also be used for littering.

{
  "version": 1,
  "vendor": {
    "d689a8b1-9944-4ae4-8402-b232dfa1c3bb": {
      "processor": "Macrohard Internets Deplorer 13"
    },
    "9d1a749e-bd01-47d3-b2b5-d89d40882a10": {
      "comment": "Patrick loves Mary."
    },
    "a67cb278-d225-4eca-a887-799aabfbe316": {
      "lolcatz": "wa suupa kawaii desu!"
    }
  }
}

Think critically about the information that you provide to your intended audience. Please don't litter.

ingredients (REQUIRED)

The ingredients necessary to bake the file. This is a simply an array of nameless ingredient objects, ordering is unimportant.

{
  "ingredients": [
    { ... },
    { ... },
    { ... }
  ]
}

This is typically the "meat" of the recipe file. Most of the recipe consists of what goes into the file and how. The next subsections describe the fields of the ingredient objects expected in the array.

hash (REQUIRED)

Identifies the ingredient data to be used in baking the file.

{
  "ingredients": [
    {
      "hash": {
        "ripemd160": "69316edbab67d81d6f473d2bff7fcc1c2b9fec7c",
        "sha512": "dd9d4f62aebfdbc415fedbc934f6b51d78ab36c21230b6650bc0327bf79150aaded1487305f8a84ae0767175348b14216d53e1f72c2c56ee96e081576ca2406a",
        "whirlpool": "ef0ec5a06a10112e364bf079381672c941a97a1cee9d54f41223f3814999654cba67ebb16f8aeac243451a603a8a71125456b0fdbc5af9d6e8ca00ee2e3c8cb8"
      }
    }
  ]
}

It is recommended that multiple hash values from different families of hash algorithm be provided.

offset (REQUIRED)

Identifies the position of the ingredient when baking the file. This is an integer, negative or positive.

{
  "ingredients": [
    {
      "offset": 32764
    }
  ]
}

Negative values less than the length of the ingredient, or positive values greater than the length of the file are valid, but nonsense. Nonsense ingredients should be ignored when baking the file.

{
  "ingredients": [
    {
      "offset": -4294967295
    }
  ]
}

mask (OPTIONAL)

A byte mask to be pre-XOR'd against each byte of the ingredient before it is baked into the file. If it is used, valid values are 0 to 255. If the value is not specified, it should be assumed to be 0. Invalid values (<0 or >255) should also be assumed to be 0.

{
  "ingredients": [
    {
      "mask": 234
    }
  ]
}

This is an optional field intended to provide additional complexity against file discovery attacks.

length (RECOMMENDED)

An advisory field, indicating the length of the ingredient binary in bytes. Valid values are non-negative integers. A value of 0 is valid but nonsense. Nonsense ingredients should be ignored when baking files.

{
  "ingredients": [
    {
      "length": 478515
    }
  ]
}

This field is optional, but it recommended that it be provided. It provides a great help to clients that want to estimate the storage and bandwidth requirements necessary to transfer and store the ingredients for the recipe.

fsm (JOKE)

If ye be a Pastafarian, be tellin' us by recognizin' His Noodly Appendage in ye recipe!

{
  "fsm": "http://www.venganza.org/"
}

The field should contain the current URI of the Church of the Flying Spaghetti Monster, whatever it happens to be at the time of the creation of the recipe. Do your part to help in the fight against global climate change.

Copyright

Copyright 2014 Patrick Meade.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.