urlshaper

URL Shaper is a go library that takes a URL path and query and breaks it up into its components and creates a shape.

URL Shaper will generate a URL Shape by taking a URL and making a number of changes to it to make it easier to do analysis on URL patterns:

• replaces query parameter values with a question mark
• query parameters in the URL shape are alphabetized
• based on patterns, variables in the URL path are replaced by the variable name

In addition to the URL shape, the Result object you get back from URL Shaper contains

• the path, with any query parameters removed
• the query, with the path removed
• a url.Values object containing all the query parameters
• a url.Values object containing all the path parameters

Parameters in the path portion of the URL are identified by matching the URL against a list of provided patterns. Patterns are matched in the order provided; the first match wins. Patterns should represent the entire path portion of the URL - include a "*" at the end to match arbitrary additional segments.

Examples

Query parameters:

input:

• path: /about/en/books?isbn=123456&author=Alice

output:

• uri: /about/en/books?isbn=123456&author=Alice
• path: /about/en/books
• query: isbn=123456&author=Alice
• query_fields: {"isbn":["123456"],"author":["Alice"]}
• path_fields: {}
• shape: /about/en/books?author=?&isbn=?

REST:

input:

• path: /about/en/books/123456
• pattern: /about/:lang/books/:isbn

output:

• uri: /about/en/books/123456
• path: /about/en/books/123456
• query: ""
• query_fields: {}
• path_fields: {"lang":["en"],"isbn":["123456"]}
• shape: /about/:lang/books/:isbn

REST & Query parameters:

input:

• path: /about/en/books?isbn=123456&author=Alice&isbn=987654
• pattern: /about/:lang/books

output:

• uri: /about/en/books?isbn=123456&author=Alice
• path: /about/en/books
• query: isbn=123456&author=Alice
• query_fields: {"isbn":["123456", "987654"],"author":["Alice"]}
• path_fields: {"lang":["en"]}
• shape: /about/:lang/books?author=?&isbn=?

Unmatched:

input:

• path /other/path
• patterns: /about/:lang/books, /docs/:section

output:

• uri: /other/path
• path: /other/path
• query: ""
• query_fields: {}
• path_fields: {}
• shape: /other/path

Wildcard:

input:

-path /docs/quickstart/linux -pattern /docs/:section/*

output:

• uri: /docs/quickstart/linux
• path: /docs/quickstart/linux
• query: ""
• query_fields: {}
• path_fields: {"quickstart":["linux"]}
• shape: /docs/:section/*