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README.md

psl

Extract Internet Domain Components Using the Public Suffix List

Description

The ‘Public Suffix List’ (https://publicsuffix.org/) is a collection of top-level domains (‘TLDs’) which include global top-level domainsa (‘gTLDs’) such as ‘.com’ and ‘.net’; country top-level domains (‘ccTLDs’) such as ‘.de’ and ‘.cn’; and, brand top-level domains such as ‘.apple’ and ‘.google’. Tools are provided to extract internet domain components using the public suffix list base data.

What’s Inside The Tin

The following functions are implemented:

  • apex_domain: Return the apex/top-private domain from a vector of domains
  • is_public_suffix: Test whether a domain is a public suffix
  • public_suffix: Return the public suffix from a vector of domains
  • suffix_extract: Separate a domain into component parts
  • suffix_extract2: Separate a domain into component parts (urltools compatible output)

PRE-Installation

You need a recent libpsl.

  • macOS: brew install libpsl
  • Debian/Ubuntu-ish: Many repos have old versions so it’s highly suggested that you build from source and ensure the library & header files are accessible
  • Windows: Just use urltools::suffix_extract() until winlibs are available for psl

Installation

devtools::install_github("hrbrmstr/psl")

Usage

library(psl)
library(tidyverse)

# current verison
packageVersion("psl")
## [1] '0.1.0'
doms <- c(
  "", "com", "example.com", "www.example.com",
  ".com", ".example", ".example.com", ".example.example", "example",
  "example.example", "b.example.example", "a.b.example.example",
  "biz", "domain.biz", "b.domain.biz", "a.b.domain.biz", "com",
  "example.com", "b.example.com", "a.b.example.com", "uk.com",
  "example.uk.com", "b.example.uk.com", "a.b.example.uk.com", "test.ac",
  "cy", "c.cy", "b.c.cy", "a.b.c.cy", "jp", "test.jp", "www.test.jp",
  "ac.jp", "test.ac.jp", "www.test.ac.jp", "kyoto.jp", "test.kyoto.jp",
  "ide.kyoto.jp", "b.ide.kyoto.jp", "a.b.ide.kyoto.jp", "c.kobe.jp",
  "b.c.kobe.jp", "a.b.c.kobe.jp", "city.kobe.jp", "www.city.kobe.jp",
  "ck", "test.ck", "b.test.ck", "a.b.test.ck", "www.ck", "www.www.ck",
  "us", "test.us", "www.test.us", "ak.us", "test.ak.us", "www.test.ak.us",
  "k12.ak.us", "test.k12.ak.us", "www.test.k12.ak.us"
)

apex_domain(doms)
##  [1] NA                NA                "example.com"     "example.com"     NA                NA               
##  [7] NA                NA                NA                "example.example" "example.example" "example.example"
## [13] NA                "domain.biz"      "domain.biz"      "domain.biz"      NA                "example.com"    
## [19] "example.com"     "example.com"     NA                "example.uk.com"  "example.uk.com"  "example.uk.com" 
## [25] "test.ac"         NA                "c.cy"            "c.cy"            "c.cy"            NA               
## [31] "test.jp"         "test.jp"         NA                "test.ac.jp"      "test.ac.jp"      NA               
## [37] "test.kyoto.jp"   NA                "b.ide.kyoto.jp"  "b.ide.kyoto.jp"  NA                "b.c.kobe.jp"    
## [43] "b.c.kobe.jp"     "city.kobe.jp"    "city.kobe.jp"    NA                NA                "b.test.ck"      
## [49] "b.test.ck"       "www.ck"          "www.ck"          NA                "test.us"         "test.us"        
## [55] NA                "test.ak.us"      "test.ak.us"      NA                "test.k12.ak.us"  "test.k12.ak.us"

public_suffix(doms)
##  [1] ""             "com"          "com"          "com"          "com"          "example"      "com"         
##  [8] "example"      "example"      "example"      "example"      "example"      "biz"          "biz"         
## [15] "biz"          "biz"          "com"          "com"          "com"          "com"          "uk.com"      
## [22] "uk.com"       "uk.com"       "uk.com"       "ac"           "cy"           "cy"           "cy"          
## [29] "cy"           "jp"           "jp"           "jp"           "ac.jp"        "ac.jp"        "ac.jp"       
## [36] "kyoto.jp"     "kyoto.jp"     "ide.kyoto.jp" "ide.kyoto.jp" "ide.kyoto.jp" "c.kobe.jp"    "c.kobe.jp"   
## [43] "c.kobe.jp"    "kobe.jp"      "kobe.jp"      "ck"           "test.ck"      "test.ck"      "test.ck"     
## [50] "ck"           "ck"           "us"           "us"           "us"           "ak.us"        "ak.us"       
## [57] "ak.us"        "k12.ak.us"    "k12.ak.us"    "k12.ak.us"

is_public_suffix(doms)
##  [1]  TRUE  TRUE FALSE FALSE  TRUE  TRUE FALSE FALSE  TRUE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE  TRUE FALSE FALSE
## [20] FALSE  TRUE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE  TRUE FALSE FALSE  TRUE FALSE FALSE  TRUE FALSE  TRUE
## [39] FALSE FALSE  TRUE FALSE FALSE FALSE FALSE  TRUE  TRUE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE  TRUE FALSE FALSE
## [58]  TRUE FALSE FALSE

suffix_extract(doms)
## # A tibble: 60 x 6
##    orig             normalized       subdomain apex            domain  suffix 
##    <chr>            <chr>            <chr>     <chr>           <chr>   <chr>  
##  1 ""               ""               <NA>      <NA>            <NA>    ""     
##  2 com              com              <NA>      <NA>            <NA>    com    
##  3 example.com      example.com      ""        example.com     example com    
##  4 www.example.com  www.example.com  www       example.com     example com    
##  5 .com             .com             <NA>      <NA>            <NA>    com    
##  6 .example         .example         <NA>      <NA>            <NA>    example
##  7 .example.com     .example.com     <NA>      <NA>            <NA>    com    
##  8 .example.example .example.example <NA>      <NA>            <NA>    example
##  9 example          example          <NA>      <NA>            <NA>    example
## 10 example.example  example.example  ""        example.example example example
## # ... with 50 more rows

str(suffix_extract2(doms)) # urltools compatible output
## 'data.frame':    60 obs. of  4 variables:
##  $ host     : chr  "" "com" "example.com" "www.example.com" ...
##  $ subdomain: chr  NA NA "" "www" ...
##  $ domain   : chr  NA NA "example" "example" ...
##  $ suffix   : chr  "" "com" "com" "com" ...
library(microbenchmark)

microbenchmark(
  urltools = urltools::suffix_extract(doms),
  psl = psl::suffix_extract(doms), # returns more data
  psl2 = psl::suffix_extract2(doms) # returns what urltools does
) -> mb

autoplot(mb)