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A URI library for Clojure

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Exploding Fish

Exploding Fish is a library for manipulating URIs. It defines a UniformResourceIdentifier protocol, and implements it on a custom Uri class, as well as java.net.URI, java.net.URL, and java.lang.String.

Usage

To use with Leiningen, add

:dependencies [[org.bovinegenius/exploding-fish "0.3.4"]]

to your project.clj.

You can use it in a source file like this:

(:use (org.bovinegenius exploding-fish))

or

(:require (org.bovinegenius [exploding-fish :as uri]))

The functions in Exploding Fish that are used to access URI values work on objects of type Uri, java.net.URI, java.net.URL, and java.lang.String.

Creating a Uri

Exploding Fish comes with a Uri class, which behaves like a map, except that it ensures that its values are always consistent.

For example,

user> (:host (uri "http://www.example.com/"))
"www.example.com"
user> (assoc (uri "http://www.example.com/") :port 8080)
#<Uri http://www.example.com:8080/>
user> (def the-uri (uri "http://www.example.com/"))
#'user/the-uri
user> (:scheme-relative the-uri)
"//www.example.com/"
user> (:scheme-relative (assoc the-uri :port 8080))
"//www.example.com:8080/"

Accessor Functions

While a benifit of using the Uri class is that you can treat it as a map, the benefit of the accessor functions is that they work on different types.

  • scheme
  • scheme-relative
  • authority
  • user-info
  • host
  • port
  • path
  • query
  • fragment

Example Usage

user> (scheme "http://www.example.com/")
"http"
user> (scheme (URI. "http://www.example.com/"))
"http"
user> (fragment (URL. "http://www.example.com/#fragment"))
"fragment"
user> (fragment (uri "http://www.example.com/#fragment"))
"fragment"

Updating URIs

The accessor functions can be used to update URIs as well, by providing an additional argument.

user> (fragment (uri "http://www.example.com/#fragment") nil)
#<Uri http://www.example.com/>
user> (host (uri "http://www.example.com/#fragment") "www.bovinegenius.org")
#<Uri http://www.bovinegenius.org/#fragment>
user> (host "http://www.example.com/#fragment" "www.bovinegenius.org")
"http://www.bovinegenius.org/#fragment"
user> (fragment (URI. "http://www.example.com/#fragment") "it-works-on-java-uris")
#<URI http://www.example.com/#it-works-on-java-uris>

Query Params

There are several functions meant to make dealing with query string parameters easier.

query-pairs returns the query string as an alist, decoded using org.bovinegenius.exploding-fish/*default-encoding*. The encoding can be bound using the default-encoding macro. If not specifically bound, the value of *default-encoding* is "UTF-8".

user> (query-pairs "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2")
[["x" "y"] ["a" "w"] ["d x" "m=f"] ["a" "x"] ["m" "2"]]

params will lookup the value of all params with the given key. If no key is given, all param values are returned.

user> (params "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "a")
["w" "x"]
user> (params "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "d x")
["m=f"]

param will lookup the last value with the given key. If a value is given, it will "set" the value of the given key. In the case where there are multiple values for the given key, it will set the first one, and remove the remaining. If a key, value, and index are given, it will set the value at the given index. If the index is larger than any value with that key, it will append a key-value pair.

user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "d x")
"m=f"
user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "a")
"x"
user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "d x" "new-value")
"http://www.test.net/some/path?x=y&a=w&d+x=new-value&a=x&m=2"
user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "a" "new-value")
"http://www.test.net/some/path?x=y&a=new-value&d+x=m%3Df&m=2"
user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "a" "new-value" 1)
"http://www.test.net/some/path?x=y&a=w&d+x=m%3Df&a=new-value&m=2"
user> (param "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2" "a" "new-value" 2)
"http://www.test.net/some/path?x=y&a=w&d+x=m%3Df&a=x&m=2&a=new-value"

query-map will build a map from the query string. The last value for a given key will "win."

user> (query-map "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2")
{"x" "y", "a" "x", "d x" "m=f", "m" "2"}

query-keys will return all of the keys (not distinct) in the query string.

user> (query-keys "http://www.test.net/some/path?x=y&a=w&d%20x=m%3df&a=x&m=2")
["x" "a" "d x" "a" "m"]

raw-pairs, params-raw, param-raw, and raw-keys are versions of the above functions that will not automatically URL encode and decode the parameters.

Paths

There are some path functions to make working with URIs easier.

normalize-path will normalize a path, collapsing things like '/some/url/../path' to '/some/path'.

user> (normalize-path "http://www.test.net/some/uri/../path/./here?x=y&a=w")
"http://www.test.net/some/path/here?x=y&a=w"

resolve-path will resolve a path against the given URI.

user> (resolve-path "http://www.test.net/some/uri/../path/./here?x=y&a=w" "new/path")
"http://www.test.net/some/path/new/path?x=y&a=w"
user> (resolve-path "http://www.test.net/some/uri/../path/./here?x=y&a=w" "/new/path")
"http://www.test.net/new/path?x=y&a=w"

absolute? returns true if the URI is absolute.

user> (absolute? (uri "http://www.test.net/new/path?x=y&a=w"))
true
user> (absolute? (uri "/new/path?x=y&a=w"))
false

Resolving URIs

resolve-uri allows you to resolve a partial URI against a full URI.

user=> (resolve-uri "http://a/b/c/d;p?q=1/2" "http://e/f")
"http://e/f"
user=> (resolve-uri "http://a/b/c/d;p?q=1/2" "g")
"http://a/b/c/g"
user=> (resolve-uri "http://a/b/c/d;p?q=1/2" "./g")
"http://a/b/c/g"
user=> (resolve-uri "http://a/b/c/d;p?q=1/2" "//g")
"http://g"
user=> (resolve-uri "http://a/b/c/d;p?q=1/2" "g?y/../x")
"http://a/b/c/g?y/../x"

License

Exploding Fish is under the MIT License.

Copyright (c) 2011,2012,2013 Walter Tetzner

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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