erik/urlencoder
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Made the encoding even more defensive

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Erik C. Thauvin 2023-01-04 19:29:04 -08:00
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@ -9,18 +9,27 @@
# URL Encoder for Kotlin
A simple library to encode/decode URL parameters.
A simple defensive library to encode/decode URL components.
This library was adapted from the [RIFE2 Web Application Framework](https://rife2.com).
A pure Java version can also be found at [https://github.com/gbevin/urlencoder](https://github.com/gbevin/urlencoder).
The rules are determined by combining the unreserved character set from
[RFC 3986](https://www.rfc-editor.org/rfc/rfc3986#page-13) with the
percent-encode set from
[application/x-www-form-urlencoded](https://url.spec.whatwg.org/#application-x-www-form-urlencoded-percent-encode-set).
For decades we've been using [java.net.URLEncoder](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URLEncoder.html) because of its improper naming. It is actually intended to encode HTML form parameters, not URLs, causing the wrong escape sequences to be used.
Both specs above support percent decoding of two hexadecimal digits to a
binary octet, however their unreserved set of characters differs and
`application/x-www-form-urlencoded` adds conversion of space to `+`,
that has the potential to be misunderstood.
Additionally, `java.net.URLEncoder` allocates memory even when no encoding is necessary, significantly impacting performance. This library has a negligible performance impact when the specified string doesn't need to be encoded.
This class encodes with rules that will be decoded correctly in either case.
Android's [Uri.encode](https://developer.android.com/reference/android/net/Uri#encode(java.lang.String,%20java.lang.String)) also addresses the same issues.
Additionally, this library allocates no memory when encoding isn't needed and
does the work in a single pass without multiple loops. Both of these
optimizations have a significantly beneficial impact on performance of encoding
compared to other solutions like the standard `URLEncoder` in the JDK.
## Examples (TL;DR)
@ -34,6 +43,7 @@ UrlEncoder.decode("%25%23ok%C3%A9k%C3%89%C8%A2%20smile%21%F0%9F%98%81") // -> %#
```
## Gradle, Maven, etc.
To use with [Gradle](https://gradle.org/), include the following dependency in your build file:
```gradle
@ -47,13 +57,15 @@ dependencies {
}
```
Instructions for using with Maven, Ivy, etc. can be found on [Maven Central](https://maven-badges.herokuapp.com/maven-central/net.thauvin.erik/urlencoder).
Instructions for using with Maven, Ivy, etc. can be found
on [Maven Central](https://maven-badges.herokuapp.com/maven-central/net.thauvin.erik/urlencoder).
## Standalone usage
UrlEncoder can be used on the command line also, both for encoding and decoding.
You have two options:
* run it with Gradle
* build the jar and launch it with Java