FreeFeed database anonymizer

This tool anonymizes the FreeFeed database dump.

It takes the pg_dump result (in plain SQL format) and anonymizes it in the following way:

• Some (configurable) tables are keeping untouched.
• Some (configurable) tables are cleaning up and becoming empty.
• In all other tables:
  • All UUIDs are irreversibly encrypting. They remain correct UUIDs, however it is impossible to restore the original UUIDs back.
  • Some (configurable) column values are replacing by lorem ipsum-like content. This applies to texts, names, emails etc. There a several rules for different types of content.
  • Some (configurable) column values are replacing by the predefined constant values.

Build

Use Go 1.14+ to build this program:

go get github.com/davidmz/anonymize-db

Use

Flags of anonymize-db:
  -i, --input string    input file name (STDIN by default)
  -o, --output string   output file name (STDOUT by default)
  -r, --rules string    rules file name (JSON)

The only required option is the path to rules.json file. This file contains specific anonymizing rules for different database tables.

The simplest usage is:

pg_dump -d freefeed -U freefeed -F p | anonymize-db -r rules.json > anonymized.sql

Configure

The rules.json file contains specific anonymizing rules for different database tables. The file contains a mapping between the full-qualified table names (including schema names, like "public.users") and instructions.

The { "action": "KEEP" } instruction means that the table must be keeping untouched.

The { "action": "CLEAN" } instruction means that the table must be truncated and become empty.

The { "columns": {...} } instruction deifies per-column anonymizing rules. Any column that are not listed here (and any tables that are not listed in the file) will be processed in general way: only the UUIDs will be encrypted.

The per-column rules are:

• text — long texts like posts and comments bodies;
• shorttext — short texts like names and titles;
• uniqword — unique words like usernames (the same username always converted to the same word);
• uniqemail — unique email addresses;
• set:VALUE — constant value to write to the column.

The set: value format is the same as the PostgreSQL COPY format, so to set a NULL value use set:\N rule (and add the second backslash for JSON).

Only non-NULL and non-empty columns processed.

Provided configuration

The provided rules.json is compatible with FreeFeed DB scheme with the last migration 20200422122956_multi_homefeeds.js.

The hashed_password value in the public.users table is a hashed 'tester' string (so all users in resulted database will have the same 'tester' password).

Debug

Set DEBUG=anon environment variable to see some debug information during the process.