crossplane

Fast and reliable NGINX configuration parser/builder created by the NGINX Amplify team.

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Install

You can install both the Command Line
Interface
and Python Module
via:

pip install crossplane

Command Line Interface

usage: crossplane <command> [options]

various operations for nginx config files

optional arguments:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit

commands:
  parse                 parses a json payload for an nginx config
  build                 builds an nginx config from a json payload
  lex                   lexes tokens from an nginx config file
  minify                removes all whitespace from an nginx config
  format                formats an nginx config file
  help                  show help for commands

crossplane parse

This command will take a path to a main NGINX config file as input, then
parse the entire config into the schema defined below, and dumps the
entire thing as a JSON payload.

usage: crossplane parse [-h] [-o OUT] [-i NUM] [--ignore DIRECTIVES]
                        [--no-catch] [--tb-onerror] [--single-file]
                        [--include-comments] [--strict]
                        filename

parses a json payload for an nginx config

positional arguments:
  filename              the nginx config file

optional arguments:
  -h, --help            show this help message and exit
  -o OUT, --out OUT     write output to a file
  -i NUM, --indent NUM  number of spaces to indent output
  --ignore DIRECTIVES   ignore directives (comma-separated)
  --no-catch            only collect first error in file
  --tb-onerror          include tracebacks in config errors
  --combine             use includes to create one single file
  --single-file         do not include other config files
  --include-comments    include comments in json
  --strict              raise errors for unknown directives

Privacy and Security

Since crossplane is usually used to create payloads that are sent to
different servers, it's important to keep security in mind. For that
reason, the --ignore option was added. It can be used to keep certain
sensitive directives out of the payload output entirely.

For example, we always use the equivalent of this flag in the NGINX Amplify
Agent
out of respect
for our users'
privacy:

--ignore=auth_basic_user_file,secure_link_secret,ssl_certificate_key,ssl_client_certificate,ssl_password_file,ssl_stapling_file,ssl_trusted_certificate

Schema

Response Object

{
    "status": String, // "ok" or "failed" if "errors" is not empty
    "errors": Array,  // aggregation of "errors" from Config objects
    "config": Array   // Array of Config objects
}

Config Object

{
    "file": String,   // the full path of the config file
    "status": String, // "ok" or "failed" if errors is not empty array
    "errors": Array,  // Array of Error objects
    "parsed": Array   // Array of Directive objects
}

Directive Object

{
    "directive": String, // the name of the directive
    "line": Number,      // integer line number the directive started on
    "args": Array,       // Array of String arguments
    "includes": Array,   // Array of integers (included iff this is an include directive)
    "block": Array       // Array of Directive Objects (included iff this is a block)
}

Note

If this is an include directive and the --single-file flag was not
used, an "includes" value will be used that holds an Array of indices
of the configs that are included by this directive.

If this is a block directive, a "block" value will be used that holds
an Array of more Directive Objects that define the block context.

Error Object

{
    "file": String,     // the full path of the config file
    "line": Number,     // integer line number the directive that caused the error
    "error": String,    // the error message
    "callback": Object  // only included iff an "onerror" function was passed to parse()
}

Note

If the --tb-onerror flag was used by crossplane parse, "callback"
will contain a string that represents the traceback that the error
caused.

Example

The main NGINX config file is at /etc/nginx/nginx.conf:

events {
    worker_connections 1024;
}

http {
    include conf.d/*.conf;
}

And this config file is at /etc/nginx/conf.d/servers.conf:

server {
    listen 8080;
    location / {
        try_files 'foo bar' baz;
    }
}

server {
    listen 8081;
    location / {
        return 200 'success!';
    }
}

So then if you run this:

crossplane parse --indent=4 /etc/nginx/nginx.conf

The prettified JSON output would look like this:

{
    "status": "ok",
    "errors": [],
    "config": [
        {
            "file": "/etc/nginx/nginx.conf",
            "status": "ok",
            "errors": [],
            "parsed": [
                {
                    "directive": "events",
                    "line": 1,
                    "args": [],
                    "block": [
                        {
                            "directive": "worker_connections",
                            "line": 2,
                            "args": [
                                "1024"
                            ]
                        }
                    ]
                },
                {
                    "directive": "http",
                    "line": 5,
                    "args": [],
                    "block": [
                        {
                            "directive": "include",
                            "line": 6,
                            "args": [
                                "conf.d/*.conf"
                            ],
                            "includes": [
                                1
                            ]
                        }
                    ]
                }
            ]
        },
        {
            "file": "/etc/nginx/conf.d/servers.conf",
            "status": "ok",
            "errors": [],
            "parsed": [
                {
                    "directive": "server",
                    "line": 1,
                    "args": [],
                    "block": [
                        {
                            "directive": "listen",
                            "line": 2,
                            "args": [
                                "8080"
                            ]
                        },
                        {
                            "directive": "location",
                            "line": 3,
                            "args": [
                                "/"
                            ],
                            "block": [
                                {
                                    "directive": "try_files",
                                    "line": 4,
                                    "args": [
                                        "foo bar",
                                        "baz"
                                    ]
                                }
                            ]
                        }
                    ]
                },
                {
                    "directive": "server",
                    "line": 8,
                    "args": [],
                    "block": [
                        {
                            "directive": "listen",
                            "line": 9,
                            "args": [
                                "8081"
                            ]
                        },
                        {
                            "directive": "location",
                            "line": 10,
                            "args": [
                                "/"
                            ],
                            "block": [
                                {
                                    "directive": "return",
                                    "line": 11,
                                    "args": [
                                        "200",
                                        "success!"
                                    ]
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

crossplane parse (advanced)

This tool uses two flags that can change how crossplane handles
errors.

The first, --no-catch, can be used if you'd prefer that crossplane
quit parsing after the first error it finds.

The second, --tb-onerror, will add a "callback" key to all error
objects in the JSON output, each containing a string representation of
the traceback that would have been raised by the parser if the exception
had not been caught. This can be useful for logging purposes.

crossplane build

This command will take a path to a file as input. The file should
contain a JSON representation of an NGINX config that has the structure
defined above. Saving and using the output from crossplane parse to
rebuild your config files should not cause any differences in content
except for the formatting.

usage: crossplane build [-h] [-d PATH] [-f] [-i NUM, -t] [--no-headers]
                        [--stdout] [-v]
                        filename

builds an nginx config from a json payload

positional arguments:
  filename              the file with the config payload

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         verbose output
  -d PATH, --dir PATH   the base directory to build in
  -f, --force           overwrite existing files
  -i NUM, --indent NUM  number of spaces to indent output
  -t, --tabs            indent with tabs instead of spaces
  --no-headers          do not write header to configs
  --stdout              write configs to stdout instead

crossplane lex

This command takes an NGINX config file, splits it into tokens by
removing whitespace and comments, and dumps the list of tokens as a JSON
array.

usage: crossplane lex [-h] [-o OUT] [-i NUM] [-n] filename

lexes tokens from an nginx config file

positional arguments:
  filename              the nginx config file

optional arguments:
  -h, --help            show this help message and exit
  -o OUT, --out OUT     write output to a file
  -i NUM, --indent NUM  number of spaces to indent output
  -n, --line-numbers    include line numbers in json payload

Example

Passing in this NGINX config file at /etc/nginx/nginx.conf:

events {
    worker_connections 1024;
}

http {
    include conf.d/*.conf;
}

By running:

crossplane lex /etc/nginx/nginx.conf

Will result in this JSON
output:

["events","{","worker_connections","1024",";","}","http","{","include","conf.d/*.conf",";","}"]

However, if you decide to use the --line-numbers flag, your output
will look
like:

[["events",1],["{",1],["worker_connections",2],["1024",2],[";",2],["}",3],["http",5],["{",5],["include",6],["conf.d/*.conf",6],[";",6],["}",7]]

crossplane format

This is a quick and dirty tool that uses crossplane
parse
internally to format an NGINX config file.
It serves the purpose of demonstrating what you can do with crossplane's
parsing abilities. It is not meant to be a fully fleshed out, feature-rich
formatting tool. If that is what you are looking for, then you may want to
look writing your own using crossplane's Python API.

usage: crossplane format [-h] [-o OUT] [-i NUM, -t] filename

formats an nginx config file

positional arguments:
  filename              the nginx config file

optional arguments:
  -h, --help            show this help message and exit
  -o OUT, --out OUT     write output to a file
  -i NUM, --indent NUM  number of spaces to indent output
  -t, --tabs            indent with tabs instead of spaces

crossplane minify

This is a simple and fun little tool that uses crossplane
lex
internally to remove as much whitespace from an
NGINX config file as possible without affecting what it does. It can't
imagine it will have much of a use to most people, but it demonstrates
the kinds of things you can do with crossplane's lexing abilities.

usage: crossplane minify [-h] [-o OUT] filename

removes all whitespace from an nginx config

positional arguments:
  filename           the nginx config file

optional arguments:
  -h, --help         show this help message and exit
  -o OUT, --out OUT  write output to a file

Python Module

In addition to the command line tool, you can import crossplane as a
python module. There are two basic functions that the module will
provide you: parse and lex.

crossplane.parse()

import crossplane
payload = crossplane.parse('/etc/nginx/nginx.conf')

This will return the same payload as described in the crossplane
parse
section, except it will be Python dicts and
not one giant JSON string.

crossplane.build()

import crossplane
config = crossplane.build(
    [{
        "directive": "events",
        "args": [],
        "block": [{
            "directive": "worker_connections",
            "args": ["1024"]
        }]
    }]
)

This will return a single string that contains an entire NGINX config
file.

crossplane.lex()

import crossplane
tokens = crossplane.lex('/etc/nginx/nginx.conf')

crossplane.lex generates 2-tuples. Inserting these pairs into a list
will result in a long list similar to what you can see in the
crossplane lex section when the --line-numbers flag
is used, except it will obviously be a Python list of tuples and not one
giant JSON string.

Other Languages

Overview

Name With Ownernginxinc/crossplane
Primary LanguagePython
Program languagePython (Language Count: 2)
Platform
License:Apache License 2.0
Release Count31
Last Release Namev0.5.8 (Posted on )
First Release Namev0.1.1 (Posted on )
Created At2017-09-27 22:18:23
Pushed At2024-01-21 20:26:26
Last Commit At2022-09-22 13:20:35
Stargazers Count670
Watchers Count36
Fork Count80
Commits Count227
Has Issues Enabled
Issues Count53
Issue Open Count13
Pull Requests Count48
Pull Requests Open Count5
Pull Requests Close Count5
Has Wiki Enabled
Is Archived
Is Fork
Is Locked
Is Mirror
Is Private
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