Encode a Ruby hash using base64

Question

Trying to encode a hash using base64 but I couldn't get the expected base64 string.

json = {
  "v": "2",
  "ps": "法国",
  "add": "fr.sangyu.tw",
  "port": "443",
  "id": "ce14d788-0f79-491e-85ca-05240612f28a",
  "aid": "233",
  "net": "ws",
  "type": "none",
  "host": "fr.sangyu.tw",
  "path": "/",
  "tls": "tls"
}

Base64.encode64 JSON.dump(json)

Expected string:

ew0KICAidiI6ICIyIiwNCiAgInBzIjogIuazleWbvSIsDQogICJhZGQiOiAiZnIuc2FuZ3l1LnR3IiwNCiAgInBvcnQiOiAiNDQzIiwNCiAgImlkIjogImNlMTRkNzg4LTBmNzktNDkxZS04NWNhLTA1MjQwNjEyZjI4YSIsDQogICJhaWQiOiAiMjMzIiwNCiAgIm5ldCI6ICJ3cyIsDQogICJ0eXBlIjogIm5vbmUiLA0KICAiaG9zdCI6ICJmci5zYW5neXUudHciLA0KICAicGF0aCI6ICIvIiwNCiAgInRscyI6ICJ0bHMiDQp9

My (incorrect) string:

eyJ2IjoiMiIsInBzIjoi5rOV5Zu9IiwiYWRkIjoiZnIuc2FuZ3l1LnR3Iiwi cG9ydCI6IjQ0MyIsImlkIjoiY2UxNGQ3ODgtMGY3OS00OTFlLTg1Y2EtMDUy NDA2MTJmMjhhIiwiYWlkIjoiMjMzIiwibmV0Ijoid3MiLCJ0eXBlIjoibm9u ZSIsImhvc3QiOiJmci5zYW5neXUudHciLCJwYXRoIjoiLyIsInRscyI6InRs cyJ9

I saw the question How to encode a hash using Ruby Base64 module but it didn't work for me.

How are you generating the expected string?

Rafayet Monon
– Rafayet Monon

2020-04-05 07:19:57 +00:00
Commented Apr 5, 2020 at 7:19 — Rafayet Monon
– Rafayet Monon, Commented Apr 5, 2020 at 7:19

Igor Kapkov · Accepted Answer · 2020-04-05 03:46:50Z

3

You do it correctly. There are a couple of reasons you don't get your expected output.

JSON.dump(json) generates the following (no formatting):

{"v":"2","ps":"","add":"fr.sangyu.tw","port":"443","id":"ce14d788-0f79-491e-85ca-05240612f28a","aid":"233","net":"ws","type":"none","host":"fr.sangyu.tw","path":"/","tls":"tls"}

You may want to use JSON.pretty_generate(json) which produce:

{
  "v": "2",
  "ps": "",
  "add": "fr.sangyu.tw",
  "port": "443",
  "id": "ce14d788-0f79-491e-85ca-05240612f28a",
  "aid": "233",
  "net": "ws",
  "type": "none",
  "host": "fr.sangyu.tw",
  "path": "/",
  "tls": "tls"
}

Lastly, I don't know which OS you are on or how you got your original expected base64, but they may have different line endings \n vs \r\n, which may cause different base64.

answered Apr 5, 2020 at 3:46

Igor Kapkov

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2 Comments

Ding Yu Over a year ago

Do you mean changing Base64.encode64 JSON.dump(json) to Base64.encode64 JSON.pretty_generate(json) ? This still doesn't generate the expected string.

Ding Yu Over a year ago

Another finding is that even if I decoded the base64 string (which I got from a API) using base64decode.org, paste the result to base64encode.org and encode it, I get a different base64 string than the original one. Maybe it's because of the different line breaks.

Rafayet Monon · Accepted Answer · 2020-04-05 07:26:20Z

0

You can use -

Base64.strict_encode64(JSON.pretty_generate(json))

The base64 string it generates is different from what you expect

ewogICJ2IjogIjIiLAogICJwcyI6ICLms5Xlm70iLAogICJhZGQiOiAiZnIuc2FuZ3l1LnR3IiwKICAicG9ydCI6ICI0NDMiLAogICJpZCI6ICJjZTE0ZDc4OC0wZjc5LTQ5MWUtODVjYS0wNTI0MDYxMmYyOGEiLAogICJhaWQiOiAiMjMzIiwKICAibmV0IjogIndzIiwKICAidHlwZSI6ICJub25lIiwKICAiaG9zdCI6ICJmci5zYW5neXUudHciLAogICJwYXRoIjogIi8iLAogICJ0bHMiOiAidGxzIgp9

But the content it generates are same.

Also I tried encoding your json in https://www.base64encode.org/ which generates the same string mentioned above in this answer.

answered Apr 5, 2020 at 7:26

Rafayet Monon

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