Selective processing of JavaScript: decoding phones numbers

From version 1.1.318 to A-Parser adds support for JS. Therefore, in this article we examine an example of this functionality, as well as will be shown, both directly during the task, you can add and execute JS from the sites.

Task. Necessary parse all phone numbers from a private ads about selling used cars on the site http://ru.auto.soov.ee/

Open and analyze site. In the search we set all the necessary parameters and obtain a link to the results. The first step is the parsing of links to ads. In the second step, we will parse the numbers from each advertisement.

1) Parsing links:

Spoiler: Code for import

Code:

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IDEiLCJwYXJzZXJzIjpbWyJIVE1MOjpMaW5rRXh0cmFjdG9yIiwiZGVmYXVsdCIs
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bHRzQnVpbGRlcnMiOltdLCJjb25maWdPdmVycmlkZXMiOltdfX0=

• In the query uses a macro {num:1:1000} to loop through all the pages.

2) Given a list of links to ads, we begin to parsing phone numbers. But if you look at the code of any page with the ad, you may notice, that the phone number where encrypted by script:

Thanks tools.js we are able to run this script and get a result. For this we need parse the script and substitute it in tools.js.

Spoiler: Code for import

Code:

eyJwcmVzZXQiOiJKU190ZWxzIDIiLCJ2YWx1ZSI6eyJwcmVzZXQiOiJKU190ZWxz
IDIiLCJwYXJzZXJzIjpbWyJOZXQ6OkhUVFAiLCJkZWZhdWx0Iix7InR5cGUiOiJv
dmVycmlkZSIsImlkIjoiZ29vZENvZGUiLCJ2YWx1ZSI6MjAwfSx7InR5cGUiOiJj
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bHNlLCJxdWVyeUJ1aWxkZXJzQWZ0ZXJJdGVyYXRvciI6ZmFsc2UsInF1ZXJ5QnVp
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d3JpdGUiOmZhbHNlfSwiZG9Mb2ciOiJubyIsImtlZXBVbmlxdWUiOiJObyIsIm1v
cmVPcHRpb25zIjpmYWxzZSwicmVzdWx0c1ByZXBlbmQiOiIiLCJyZXN1bHRzQXBw
ZW5kIjoiIiwicXVlcnlCdWlsZGVycyI6W10sInJlc3VsdHNCdWlsZGVycyI6W10s
ImNvbmZpZ092ZXJyaWRlcyI6W119fQ==

• To use this preset, you must first register function catchWrite in tools.js. To do this, insert the following code into the JavaScript Editor and save:

As a result we get a list of almost 13K unique phone numbers. The average speed of parsing on 300 threads was almost 4k queries per minute.


P.S. To use presets in this article is needed A-Parser version not below 1.1.318.