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Python client library for imgix.

Project description

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A Python client library for generating URLs with imgix. imgix is a high-performance distributed image processing service. More information can be found at http://www.imgix.com.

Installation

$ pip install imgix

Basic Usage

To begin creating imgix URLs programmatically, simply import the imgix library and create a URL builder. The URL builder can be reused to create URLs for any images on the domains it is provided.

import imgix

builder = imgix.UrlBuilder("demos.imgix.net")
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos.imgix.net/bridge.png?h=100&w=100

For HTTPS support, simply specify the HTTPS flag like so:

import imgix

builder = imgix.UrlBuilder("demos.imgix.net", use_https=True)
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# https://demos.imgix.net/bridge.png?h=100&w=100

Signed URLs

To produce a signed URL, you must enable secure URLs on your source and then provide your signature key to the URL builder.

import imgix

builder = imgix.UrlBuilder("demos.imgix.net", sign_key="test1234")
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos.imgix.net/bridge.png?h=100&w=100&s=7370d6e36bb2262e73b19578739af1af

Domain Sharded URLs

Domain sharding enables you to spread image requests across multiple domains. This allows you to bypass the requests-per-host limits of browsers. We recommend 2-3 domain shards maximum if you are going to use domain sharding.

In order to use domain sharding, you need to add multiple domains to your source. You then provide a list of these domains to a builder.

import imgix

builder = imgix.UrlBuilder([
    "demos-1.imgix.net",
    "demos-2.imgix.net",
    "demos-3.imgix.net",
])

print builder.create_url("/bridge.png", {'w': 100, 'h': 100})
print builder.create_url("/flower.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos-2.imgix.net/bridge.png?h=100&w=100
# http://demos-3.imgix.net/flower.png?h=100&w=100

By default, shards are calculated using a checksum so that the image path always resolves to the same domain. This improves caching in the browser. However, you can supply a different strategy that cycles through domains instead. For example:

import imgix

builder = imgix.UrlBuilder([
    "demos-1.imgix.net",
    "demos-2.imgix.net",
    "demos-3.imgix.net",
], shard_strategy=imgix.SHARD_STRATEGY_CYCLE)

for i in xrange(4):
    print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos-1.imgix.net/bridge.png?h=100&w=100
# http://demos-2.imgix.net/bridge.png?h=100&w=100
# http://demos-3.imgix.net/bridge.png?h=100&w=100
# http://demos-1.imgix.net/bridge.png?h=100&w=100

Usage with UTF-8

For usage with non-ASCII characters, please be sure to that your project’s source files specify UTF-8 encoding:

# -*- coding: utf-8 -*-

If you don’t add this encoding, and you have an image with name for example ‘tiburón.jpeg’, you will get the following error trying to run your script:

SyntaxError: Non-ASCII character '***' in file test.py on line 6, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

Running Tests

To run the tests and format the code, simply:

tox

Changelog

2.1.0 (2019-02-13)

  • Domain validation added during UrlBuilder initialization
  • sign_with_library_version parameter from UrlBuilder deprecated in favor of include_library_param.

2.0.0 (2018-08-08)

  • UrlBuilder’s sign_mode argument removed
  • opts parameter from UrlBuilder.create_url deprecated in favor of params.

1.2.0 (2018-06-20)

  • sign_mode argument deprecated
  • License corrected to BSD-2-Clause.
  • Docstrings added to classes and methods.

1.1.2 (2016-06-30)

  • Proper encodeURIComponent-style URL encoding for web proxy sources. See #21 for more information.

1.1.0 (2016-02-26)

  • Added automatic Base64 encoding for all Base64 variant parameters.
  • Properly encoding all query keys and values.

1.0.0 (2016-01-15)

  • Change UrlBuilder#create_url to accept dict instead of kwargs. This fixes an issue with reserved words that are also imgix params potentially causing errors.

0.2.1 (2016-01-15)

  • Fixed a bug where any passed params that were falsy would not be passed through to imgix.

0.2.0 (2015-06-15)

  • Introduces defaulting to HTTPS on all requests, per the imgix-blueprint.

0.1.0 (2015-06-11)

  • Includes new functionality to sign every URL with an ixlib parameter for diagnostic purposes.

0.0.4 (2015-06-10)

  • New README note about publishing packages

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