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programming·Programmingby∟⊔⊤∦∣≶

Can anyone tell me what format this uh.. nested dictionary is?

cross-posted from: https://lemmy.nz/post/4294116

I have a file with content like this:

item({
     ["attr"] = {
        ["size"] = "62091";
        ["filename"] = "qBuUP9-OTfuzibt6PQX4-g.jpg";
        ["stamp"] = "2023-12-05T19:31:37Z";
        ["xmlns"] = "urn:xmpp:http:upload:0";
        ["content-type"] = "image/jpeg";
     };
     ["key"] = "Wa4AJWFldqRZjBozponbSLRZ";
     ["with"] = "email@address";
     ["when"] = 1701804697;
     ["name"] = "request";
});

I need to know what format this is, and if there exists a tool in linux already to parse this or if I need to write one myself?

Thanks!

View original on lemmy.nz
34
Comments21

21 replies

∟⊔⊤∦∣≶reply
lemmy.nz

Ohhhhh...

Ok so I just have to write a bit of Lua to utilise the file and give me the info I want.

Thanks!

7
vrighterreply
discuss.tchncs.de

assuming you run it in the right lua environment. The item function must be defined, and we're only speculating about its return value without seeing proper docs, or the source

5
∟⊔⊤∦∣≶reply
lemmy.nz

Item is a function?

Well actually, yeah thats kinda obvious isn't it now I look at the whole thing.

Thats fine, I'll just use a bit of the old sed and json it.

Aha I have avoided learning Lua yet again!

5
vrighterreply
discuss.tchncs.de

the code is constructing a table, and passing it to a function called item. But if all you need is the data, you can just remove the function call and assign the table to a variable like so: local myvar = {...}.

then you can just manipulate the table as usual.

2
∟⊔⊤∦∣≶reply
lemmy.nz

Unfortunately, this sequence is repeated many many times, so I would need to do a for-each and construct a new table for each inner section..

There's gotta be a better way. Time to read the source code and hijack whatever item() is doing.

3
vrighterreply
discuss.tchncs.de

actually those semicolons indicate this isn't actually lua, they are invalid in table constructors afaik

2
Jummitreply
lemmy.one

This isn't Lua code, Lua requires commas as separators for table items.

EDIT: Retracted, it seems like Lua allows this madness

2
Jummitreply
lemmy.one

Wow. Seems like I will never stop learning new things about Lua.

3
56!
lemmy.ml

I think it's just normal Lua code.

Here's a quick json converter (based on https://stackoverflow.com/a/55575074), assuming you have lua installed:

local function to_json(obj)
    local result = {}
    for key, value in pairs(obj) do
        if type(value) == "string" then
            value = string.format("\"%s\"", value)
        elseif type(value) == "table" then
            value = to_json(value)
        end
        table.insert(result, string.format("\"%s\":%s", key, value))
    end
    return "{" .. table.concat(result, ",") .. "}"
end

function item(obj)
    print(to_json(obj))
end

dofile(arg[1])

It just defines the item function to print json, and executes the data file.

arg[1], the first command line argument, is the path to the data file:

$  lua to_json.lua path/to/datafile.list

and pipe the output to something.json or whatever else you want to do.

3
∟⊔⊤∦∣≶reply
lemmy.nz

Not to worry; there's definitely no sensitive information in here and it's from a preprod environment.

(If you're able to figure out a way to use that key field, you're either going to get shot by the FBI or hired by the CIA.)

It is a file created that records information about files in another folder. I just want to extract some values from it. I would have expected this to be in like, xml or json. I believe the program that generated this file is written in Lua, but I don't know Lua.

1
Rikudou_Sagereply
lemmings.world

Security by obscurity is no security at all. You should really invalidate and change the key. I personally would fire you if I ever found out you leaked credentials and then did nothing about it.

1
∟⊔⊤∦∣≶reply
lemmy.nz

This isn't even an encryption key. It's a unique name generated for the image. My guess is it uses the word 'key' because the 'value' is the image file.

This is also my preprod environment.

1
Saganaki
lemmy.one

Looks like somebody rewrote json to require brackets around keys and to require semicolons? Very likely custom.

1

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